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Artykuły w czasopismach na temat „Borehole filler”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Chen, Xue Xi, Zhong Qian Chang, and Qi Li. "Experimental Investigation of Three-Phase Foam Sealing Material for Fractured Borehole." Applied Mechanics and Materials 378 (August 2013): 239–43. http://dx.doi.org/10.4028/www.scientific.net/amm.378.239.

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To develop a kind of ideal sealing material, uniform experiments were conducted in a simulation test device after the determination of material composition and approximate ratio range. The experimental data was fitted by stepwise regression analysis and optimal mixture ratio was obtained. The reliability is perfect when the ratio of foaming agent FP, foam stabilizer WP, solid filler RX and solid filler GX is 1.5:2:3:3. Field application tests show that sealing material in the above ratio has advantages of less time waste, higher reliability and better adaptability. It has a wide application pr

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Kalousová, Hana, Eva Bartoníčková, and Tomáš Opravil. "Influence of Storage Conditions on Quality of Fly Ashes." Advanced Materials Research 1000 (August 2014): 59–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1000.59.

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The presented paper deals with the issue of influence of storage conditions on the quality of conventional fly ashes which are produced by combustion of lignite. These ashes were stockpiled for long time. A borehole for sampling was made in the fly ash stock-pile. Total depth of the borehole was 20 m. Samples of fly ashes taken from every single meter were analyzed and next mechanical properties and the volume stability of materials containing these fly ashes were tested. The quality of fly ashes especially with respect to the possibility to use them as components of pastes, mortars and concre

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3

Oleg Dyshin, Oleg Dyshin, Ibrahim Habibov Ibrahim Habibov, and Arzu Suleymanova Arzu Suleymanova. "SYNERGETIC EFFECT OF STRENGTHENING POLYMER NANOCOMPOSITES." ETM - Equipment, Technologies, Materials 13, no. 01 (2023): 04–09. http://dx.doi.org/10.36962/etm13012023-04.

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According to the cluster model of glassy polymers, in the amorphous state they are natural nanocomposites of two components of a loosely packed matrix and nanoclusters immersed in it, respectively playing the role of a matrix and filler in a natural composite. In this interpretation of the polymer, an important role is played by the dimensional effect of nanoclusters, identical to the specified effect of a nanofiller in an artificial nanocomposite, namely, a decrease in the size of both nanoclusters and dispersed particles leads to a sharp increase in the degree of amplification (modulus of el

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4

Li, Bo, Junxiang Zhang, Jianping Wei, and Qiang Zhang. "Preparation and Sealing Performance of a New Coal Dust Polymer Composite Sealing Material." Advances in Materials Science and Engineering 2018 (August 6, 2018): 1–10. http://dx.doi.org/10.1155/2018/8480913.

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In this study, a new coal-dust polymer composite material (CP) was fabricated to improve the borehole gas drainage effect and address the limitations of traditional sealing materials. This material used coal dust generated during underground drilling construction as filler, amino resin as binder, and also some other additives. Based on the orthogonal test scheme, 16 groups of experiments were conducted to investigate the effects of coal-dust content, water-material ratio, and cross-linking agent content on viscosity, 3-day (3-d) compressive strength, and gel time of the CP. The influences of t

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5

Benyoub, M., B. Aour, B. Bouhacina, and K. Sadek. "Numerical Investigation of the Physical Properties Effect on the Thermal Performance of a Vertical Geothermal Heat Exchanger." Engineering, Technology & Applied Science Research 8, no. 2 (2018): 2715–23. http://dx.doi.org/10.48084/etasr.1827.

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Low-temperature geothermal energy is a promising technique for heating and cooling residential and commercial premises, especially since it is one of the green energy solutions that respect the environment. The principle of this technique is based on thermal exchange between the heat pump and the basement using a vertically buried heat exchanger. This is usually made of a U-shaped tube inserted vertically in a borehole made in the ground and filled with a filler material. The purpose of the present study is to vary the different construction materials of the U-tube, the filling material and th

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6

Benyoub, M., B. Aour, B. Bouhacina, and K. Sadek. "Numerical Investigation of the Physical Properties Effect on the Thermal Performance of a Vertical Geothermal Heat Exchanger." Engineering, Technology & Applied Science Research 8, no. 2 (2018): 2715–23. https://doi.org/10.5281/zenodo.1257558.

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Low-temperature geothermal energy is a promising technique for heating and cooling residential and commercial premises, especially since it is one of the green energy solutions that respect the environment. The principle of this technique is based on thermal exchange between the heat pump and the basement using a vertically buried heat exchanger. This is usually made of a U-shaped tube inserted vertically in a borehole made in the ground and filled with a filler material. The purpose of the present study is to vary the different construction materials of the U-tube, the filling material and th

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7

Chang, Keun Sun, Min Jun Kim, and Young Jae Kim. "An Experimental Study on the Thermal Performance Evaluation of SCW Ground Heat Exchanger." International Journal of Air-Conditioning and Refrigeration 25, no. 01 (2017): 1750006. http://dx.doi.org/10.1142/s2010132517500067.

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In recent years, application of the standing column well (SCW) ground heat exchanger (GHX) has been noticeably increased as a heat transfer mechanism of ground source heat pump (GSHP) systems with its high heat capacity and efficiency. Determination of the ground thermal properties is an important task for sizing and estimating cost of the GHX. In this study, an in situ thermal response test (TRT) is applied to the thermal performance evaluation of SCW. Two SCWs with different design configurations are installed in sequence to evaluate their effects on the thermal performance of SCW using a si

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8

Liu, Sixin, and Motoyuki Sato. "Transient radiation from an unloaded, finite dipole antenna in a borehole: Experimental and numerical results." GEOPHYSICS 70, no. 6 (2005): K43—K51. http://dx.doi.org/10.1190/1.2106048.

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Dipole antennas in boreholes are used for tomographic imaging or electromagnetic well logging. A cylindrically layered structure within the borehole will change the radiation characteristics of a dipole antenna. Our objective is to understand the effects of the borehole structure upon the impedance, waveform distortion, and directivity patterns of a dipole antenna. We use a finite-difference, time-domain (FDTD) technique to simulate borehole-antenna radiation, while the geometry of both the dipole and the borehole are modeled with a subgrid technique. The simulated input impedances are verifie

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9

Zhang, Yiping, Yi Luo, Sipeng Wan, et al. "Influence of Decoupled Charge Structure and Filler on the Blasting Effect." Shock and Vibration 2020 (December 5, 2020): 1–13. http://dx.doi.org/10.1155/2020/8866449.

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This study compared models of specimens with different filler media and decoupled charge structures in terms of the blasting effect. The test system combined a high-speed camera and high-speed static strain test analyzer. A physical model of a concrete single-borehole decoupled charge structure was designed to study the geometric elements of the blasting funnel, flyrock launch velocity, peak strain values, and distribution of the gravel lumpiness. The experimental results showed that for the same decoupling coefficient, when expandable polystyrene foam (EPS) was used as the filling medium, the

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10

Сингуров, А. А. "Physico-chemical structure of technological polymer-gel liquids for blocking a productive reservoir in conditions of abnormally low reservoir pressures." Нефтяная провинция, no. 1(33) (March 30, 2023): 197–208. http://dx.doi.org/10.25689/np.2023.1.197-208.

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При проведении капитального ремонта скважин (КРС) с предварительным глушением скважины, основным фактором, влияющим на конечный результат ремонта, является выбор жидкости глушения и промывочной жидкости. Установлено, что проведение работ по промывке песчано-глинистой пробки (ПГП) с глушением продуктивного пласта необходимо применение жидкостей, обладающих способностью временного блокирования призабойной зоны продуктивного пласта (ПЗП). Наиболее полно этим требованиям соответствуют пенные системы с различными наполнителями, которые обладают закупоривающим и коркообразующим свойством. Из многочи

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11

Todorov, Oleg, Kari Alanne, Markku Virtanen, and Risto Kosonen. "Different Approaches for Evaluation and Modeling of the Effective Thermal Resistance of Groundwater-Filled Boreholes." Energies 14, no. 21 (2021): 6908. http://dx.doi.org/10.3390/en14216908.

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Groundwater-filled boreholes are a common solution in Scandinavian installations of ground source heat pumps (GSHP) due to the particular hydro-geological conditions with existing bedrock, and groundwater levels close to the surface. Different studies have highlighted the advantage of water-filled boreholes compared with their grouted counterparts since the natural convection of water within the borehole tends to decrease the effective thermal resistance Rb*. In this study, several methods are proposed for the evaluation and modeling of the effective thermal resistance of groundwater-filled bo

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12

Morin, Roger H., Guillaume E. Descamps, and L. DeWayne Cecil. "Acoustic televiewer logging in glacier boreholes." Journal of Glaciology 46, no. 155 (2000): 695–99. http://dx.doi.org/10.3189/172756500781832684.

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AbstractThe acoustic televiewer is a geophysical logging instrument that is deployed in a water-filled borehole and operated while trolling. It generates a digital, magnetically oriented image of the borehole wall that is developed from the amplitudes and transit times of acoustic waves emitted from the tool and reflected at the water–wall interface. The transit-time data are also converted to radial distances, from which cross-sectional views of the borehole shape can be constructed. Because the televiewer is equipped with both a three-component magnetometer and a two-component inclinometer,

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13

Fidorów-Kaprawy, Natalia, and Łukasz Stefaniak. "Potential of CO2 Emission Reduction via Application of Geothermal Heat Exchanger and Passive Cooling in Residential Sector under Polish Climatic Conditions." Energies 15, no. 22 (2022): 8531. http://dx.doi.org/10.3390/en15228531.

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The article summarizes the results of the 25-year time horizon performance analysis of the ground source heat pump that serves as a heat source in a detached house in the climatic conditions that prevail in Wrocław, Poland. The main aim is to assess the potential of ground regeneration and reduction of CO2 emission by passive cooling application. The study adds value to similar research conducted worldwide for various conditions. The behavior of the lower source of the heat pump was simulated using EED software. The ground and borehole properties, heat pump characteristics, heating and cooling

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14

Lee, M. W. "Particle displacements on the wall of a borehole from incident plane waves." GEOPHYSICS 52, no. 9 (1987): 1290–96. http://dx.doi.org/10.1190/1.1442389.

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Particle displacements from incident plane waves at the wall of a fluid‐filled borehole are formulated by applying the seismic reciprocity theorem to far‐field displacement fields. Such displacement fields are due to point forces acting on a fluid‐filled borehole under the assumption of long wavelengths. The displacement fields are analyzed to examine the effect of the borehole on seismic wave propagation, particularly for vertical seismic profiling (VSP) measurements. When the shortest wavelength of interest is approximately 25 times longer than the borehole’s diameter, the scattered displace

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15

Tronicke, Jens, and Klaus Holliger. "Effects of gas‐ and water‐filled boreholes on the amplitudes of crosshole georadar data as inferred from experimental evidence." GEOPHYSICS 69, no. 5 (2004): 1255–60. http://dx.doi.org/10.1190/1.1801942.

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A special packer system is developed that replaces the water in a borehole with a gas and thus allows us to isolate the effects of the borehole filling media on crosshole georadar measurements. We demonstrate experimentally that the radiative characteristics of borehole georadar antennas differ substantially for gas‐ and water‐filled boreholes. The main differences are a spectral shift to lower frequencies and a less focused radiation pattern in the case of a water‐filled borehole. These effects are correctly predicted by a basic finite‐difference time‐domain (FDTD) modeling approach, which of

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16

Kulessa, Bernd, and Bryn Hubbard. "Interpretation of borehole impulse tests at Haut Glacier d’Arolla, Switzerland." Annals of Glaciology 24 (1997): 397–402. http://dx.doi.org/10.3189/s0260305500012507.

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One hundred and sixteen impulse tests were conducted in a dense borehole array at Haut Glacier d’Arolla, Switzerland, during July and August 1995. Impulse-test response pressure oscillations reveal marked variations in three parameters: relative amplitude decay, oscillation frequency and net water-level displacement. Analysis of response signals from water-filled boreholes indicates that (i) responses from individual boreholes are reproducible over some tens of minutes; (ii) responses are similar, but not identical, for slug insertion (“slug tests”) and removal (“bail tests”); (iii) signal amp

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17

Doetsch, Joseph A., Ilaria Coscia, Stewart Greenhalgh, Niklas Linde, Alan Green, and Thomas Günther. "The borehole-fluid effect in electrical resistivity imaging." GEOPHYSICS 75, no. 4 (2010): F107—F114. http://dx.doi.org/10.1190/1.3467824.

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Fluid that fills boreholes in crosswell electrical resistivity investigations provides the necessary electrical contact between the electrodes and the rock formation but it is also the source of image artifacts in standard inversions that do not account for the effects of the boreholes. The image distortions can be severe for large resistivity contrasts between the rock formation and borehole fluid and for large borehole diameters. We have carried out 3D finite-element modeling using an unstructured-grid approach to quantify the magnitude of borehole effects for different resistivity contrasts

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18

Kulessa, Bernd, and Bryn Hubbard. "Interpretation of borehole impulse tests at Haut Glacier d’Arolla, Switzerland." Annals of Glaciology 24 (1997): 397–402. http://dx.doi.org/10.1017/s0260305500012507.

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One hundred and sixteen impulse tests were conducted in a dense borehole array at Haut Glacier d’Arolla, Switzerland, during July and August 1995. Impulse-test response pressure oscillations reveal marked variations in three parameters: relative amplitude decay, oscillation frequency and net water-level displacement. Analysis of response signals from water-filled boreholes indicates that (i) responses from individual boreholes are reproducible over some tens of minutes; (ii) responses are similar, but not identical, for slug insertion (“slug tests”) and removal (“bail tests”); (iii) signal amp

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19

Waddington, Brian S., and Garry K. C. Clarke. "Hydraulic properties of subglacial sediment determined from the mechanical response of water-filled boreholes." Journal of Glaciology 41, no. 137 (1995): 112–24. http://dx.doi.org/10.1017/s0022143000017810.

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AbstractFreezing of water-filled boreholes drives water into the subglacial bed and the associated pressure effects yield information about subglacial hydraulic properties. A numerical model describing the mechanical response of an unconnected borehole and the bed beneath it to this freezing forcing was developed, using a nonlinear transient visco-elastic ice-flow law and an approximate model of top-down freezing. The resulting system of equations was solved using the method of lines. Results agreed well with analytic solutions, when parameters were correctly chosen. Forward modelling of press

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20

Waddington, Brian S., and Garry K. C. Clarke. "Hydraulic properties of subglacial sediment determined from the mechanical response of water-filled boreholes." Journal of Glaciology 41, no. 137 (1995): 112–24. http://dx.doi.org/10.3189/s0022143000017810.

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AbstractFreezing of water-filled boreholes drives water into the subglacial bed and the associated pressure effects yield information about subglacial hydraulic properties. A numerical model describing the mechanical response of an unconnected borehole and the bed beneath it to this freezing forcing was developed, using a nonlinear transient visco-elastic ice-flow law and an approximate model of top-down freezing. The resulting system of equations was solved using the method of lines. Results agreed well with analytic solutions, when parameters were correctly chosen. Forward modelling of press

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21

Zhao, Xinbo, Jianjun Wang, and Yue Mei. "Analytical Model of Wellbore Stability of Fractured Coal Seam Considering the Effect of Cleat Filler and Analysis of Influencing Factors." Applied Sciences 10, no. 3 (2020): 1169. http://dx.doi.org/10.3390/app10031169.

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Currently, coal borehole collapses frequently occur during drilling. Considering that the coal near to the wellbore is cut into blocks, and the cleat filler of the coal influences the stress distribution near the wellbore, a new theoretical solution of a near-wellbore Stress Field in coal bed wells is established. In addition, according to the limit equilibrium theory and the E.MG-C criterion, the limit sliding formula of the quadrilateral and triangular block is deduced, and the slipping direction of the blocks is further judged. Finally, the wellbore stability model of the coal seam is estab

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22

Holliger, Klaus, and Tim Bergmann. "Numerical modeling of borehole georadar data." GEOPHYSICS 67, no. 4 (2002): 1249–57. http://dx.doi.org/10.1190/1.1500387.

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High‐frequency electromagnetic (EM) wave propagation phenomena associated with borehole georadar experiments are complex. To improve our understanding of the governing physical processes, we present a finite‐difference solution of Maxwell's equations in cylindrical coordinates. This approach allows us to model the full EM wavefield associated with borehole georadar experiments and to assess the adequacy of ray‐based methods currently used to interpret the observed amplitudes. Our results indicate that because shallow boreholes are often water filled, the finite length of the boreholes as well

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23

Ajam, Sami O., and V. E. Rahal. "APPLICATIONS OF THERMAL MULTIGATE DECAY PULSED NEUTRON LOGS IN UNUSUAL DOWNHOLE LOGGING ENVIRONMENTS." APPEA Journal 25, no. 1 (1985): 265. http://dx.doi.org/10.1071/aj84023.

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The Thermal Multigate Decay (TMD) logging system utilizes a pulsed 14 Mev generator and two gamma ray detectors to obtain measurements of the capture cross sections of downhole formations. The composite decay curve from both formation and borehole capture gamma rays is detected, and is separated into the two individual components : sigma formation and sigma borehole. The resulting sigma formation measurement is only minimally affected by borehole conditions, especially in cased wells.In addition to sigma formation and sigma borehole, the TMD system generates a dual-spaced porosity ratio and se

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24

Xu, Quan Jun, Nan Jiang, Yuan Long, et al. "Investigation of the Large Scale Borehole Soundless Cracking Experiment on the Concrete Members." Applied Mechanics and Materials 782 (August 2015): 219–26. http://dx.doi.org/10.4028/www.scientific.net/amm.782.219.

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In this paper, by the large scale borehole soundless cracking method, the fracture experiments were performed on the plain concrete and reinforced concrete. For plain concrete experiment, the open borehole was prefabricated in the concrete pillar at first. Secondly, two non-woven fabric bags contained soundless cracking agent were prepared, one for the main expanding and the other for blocking. Thirdly, the main expanding bag was plugged, and then the blocking bag. At last, the cracks in the concrete pillar were developed within 3 hours. For reinforced concrete experiment, the closed boreholes

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25

Dong, Wenjie, Michel Bouchon, and M. Nafi Toksöz. "Borehole seismic‐source radiation in layered isotropic and anisotropic media: Boundary element modeling." GEOPHYSICS 60, no. 3 (1995): 735–47. http://dx.doi.org/10.1190/1.1443812.

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In modeling waves radiated from a borehole seismic source in layered isotropic or anisotropic media, the commonly used numerical methods (e.g., finite difference and finite element) encounter difficulties because of the large scale difference between the borehole diameter and the formation extent. To get around this problem, we apply the indirect boundary element method to establish a general algorithm for modeling source radiation from open and cased boreholes in layered transversely isotropic (TI) media. The essence of the algorithm is to use discrete secondary sources (unknowns) on both sid

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26

Paillet, Frederick L., and C. H. Cheng. "A numerical investigation of head waves and leaky modes in fluid‐filled boreholes." GEOPHYSICS 51, no. 7 (1986): 1438–49. http://dx.doi.org/10.1190/1.1442192.

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Although synthetic borehole seismograms can be computed for a wide range of borehole conditions, the physical nature of shear and compressional head waves in fluid‐filled boreholes is poorly understood. This paper presents a series of numerical experiments designed to explain the physical mechanisms controlling head‐wave propagation in boreholes. These calculations demonstrate the existence of compressional normal modes equivalent to shear normal modes, or pseudo‐Rayleigh waves, with sequential cutoff frequencies spaced between the cutoff frequencies for the shear normal modes. Major contribut

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27

Tverda, Oksana, Olena Kofanova, Mykola Repin, et al. "A resource efficient and environmentally safe charge structure for mining in an open-pit." Mining of Mineral Deposits 15, no. 4 (2021): 84–90. http://dx.doi.org/10.33271/mining15.04.084.

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Purpose. The purpose is to reduce mineral losses during the explosive destruction of rocks and environmental pollution by harmful gases and fine particulate matter. Methods. To achieve the objectives of the study, methods of physicochemical analysis and mechanics of continuous media have been used. The method of physico-chemical analysis has been used to determine the quantitative and qualitative characteristics of the composition of the well stemming depending on the parameters of the well, the type of explosive, the amount and type of harmful gases formed during the explosion. Methods of sol

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Kurkjian, A. L., R. T. Coates, J. E. White, and H. Schmidt. "Finite‐difference and frequency‐wavenumber modeling of seismic monopole sources and receivers in fluid‐filled boreholes." GEOPHYSICS 59, no. 7 (1994): 1053–64. http://dx.doi.org/10.1190/1.1443661.

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In borehole seismic experiments the presence of the borehole has a significant effect on observations. Unfortunately, including boreholes explicitly in modeling schemes excludes the use of some methods (e.g., frequency‐wavenumber) and adds prohibitively to the cost of others (e.g., finite difference). To overcome this problem, we use the concept of an effective source/receiver array to replace the explicit representation of the borehole by a distributed seismic source/receiver. This method mimics the presence of the borehole at seismic frequencies under a wide variety of conditions without add

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Ben, Jian-Lin, Wen-Xiao Qiao, Xiao-Hua Che, Xiao-Dong Ju, Jun-Qiang Lu, and Bai-Yong Men. "Field validation of imaging an adjacent borehole using scattered P-waves." Petroleum Science 17, no. 5 (2020): 1272–80. http://dx.doi.org/10.1007/s12182-020-00475-5.

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Abstract Acoustic waves enter a rock formation from a borehole and are reflected or scattered upon encountering a geologic structure. Consequently, we obtain the structure location represented by the azimuth and distance from the borehole using the acoustic reflection or scattering. Downhole acoustic measurements with the azimuthal resolution are realized using an azimuthal acoustic receiver sonde composed of several arcuate phased array receivers. Eight sensors distributed evenly across the arcuate phased array receiver can record acoustic waves independently; this allows us to adopt the beam

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Hirabayashi, Nobuyasu, and W. Scott Leaney. "Wavefield separation for borehole acoustic reflection survey using parametric decomposition and waveform inversion." GEOPHYSICS 84, no. 4 (2019): D151—D159. http://dx.doi.org/10.1190/geo2018-0330.1.

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We have developed a wavefield separation filter for borehole acoustic reflection surveys (BARS) that uses parametric decomposition and waveform inversion, which we call the PWI filter. A BARS survey uses a sonic logging tool in a fluid-filled borehole to image near-borehole structure. Signals from a monopole or dipole source are reflected from geologic interfaces and recorded by arrays of receivers of the same tool. Because amplitudes of direct head waves and borehole modes are significantly larger than those of the event signals, wavefield separation to extract the event signals is crucial fo

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Casasso, Alessandro, Natalia Ferrantello, Simone Pescarmona, Carlo Bianco, and Rajandrea Sethi. "Can Borehole Heat Exchangers Trigger Cross-Contamination between Aquifers?" Water 12, no. 4 (2020): 1174. http://dx.doi.org/10.3390/w12041174.

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Borehole heat exchangers (BHEs) commonly reach depths of several tens of meters and cross different aquifers. Concerns have been raised about the possibility of boreholes to act as preferential pathways for contaminant transport among aquifers (cross-contamination). This article employs numerical modelling of contaminant transport in the subsurface to address these concerns. A common hydrogeological setup is simulated, composed of three layers: A shallow contaminated and a deep uncontaminated aquifer separated by an aquitard, all crossed by a permeable borehole. The hydraulic conductivity of t

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McCann, D. M., R. Baria, P. D. Jackson, and A. S. P. Green. "Application of cross‐hole seismic measurements in site investigation surveys." GEOPHYSICS 51, no. 4 (1986): 914–29. http://dx.doi.org/10.1190/1.1442149.

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Application of the cross‐hole seismic method to site investigation surveys for civil engineering developments is illustrated by case histories from the United Kingdom using the borehole sparker probe developed in McCann et al. (1975) as the seismic source. At Newborough, Anglesey, it is shown that this source generates both a compressional‐wave and a vertically polarized shear‐wave in the borehole; the measured velocity values are used to determine the dynamic elastic moduli of the saturated sand deposit at this site. At Cocking, Sussex and East Fleet, Dorset, the presence of an air‐filled voi

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33

Demezhko, Dmitry Yu, Bogdan D. Khatskevich, and Mansur G. Mindubaev. "Methods of suppressing free thermal convection in water-filled wells during temperature research." Georesursy 22, no. 1 (2020): 55–62. http://dx.doi.org/10.18599/grs.2020.1.55-62.

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Тemperature measurements in boreholes are widely used in oil and gas geophysics, hydrogeology, geoecology, geocryology, and in the operation of hydrothermal resources. The number of applications of borehole temperature data is continuously growing. Requirement for temperature measurement accuracy is also growing. However, increasing the accuracy is limitedby free thermal convection phenomenon (FTC). It occurs under a positive temperature gradient and causes temperature noise, the level of which may exceed the useful signal. It was believed for a long time that the FTC currentsare organized as

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Zulkarnaen, Muhammad Fauzi, and Husnul Hatimah. "Aeration and Slow Sand Filter Technology in Drilling Well Water Treatment to Reduce TDS Levels." Hydrogen: Jurnal Kependidikan Kimia 12, no. 6 (2024): 1255. https://doi.org/10.33394/hjkk.v12i6.13953.

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The quality of borehole water is often affected by the high content of Total Dissolved Solids (TDS) which can disrupt human health and quality of life. This study examines the effectiveness of the combination of venturi aeration and slow sand filter technology in reducing TDS levels in boreholes in East Lombok, NTB. The priority is the use of venturi aeration and slow sand filtration in an integrated manner as a combined treatment for borehole water, which has not been widely explored in previous studies. This method offers a practical, cost-effective, and environmentally friendly solution to

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Clow, Gary D., Richard W. Saltus, and Edwin D. Waddington. "A new high-precision borehole-temperature logging system used at GISP2, Greenland, and Taylor Dome, Antarctica." Journal of Glaciology 42, no. 142 (1996): 576–84. http://dx.doi.org/10.1017/s0022143000003555.

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AbstractWe describe a high-precision (0.1–1.0 mK) borehole-temperature (BT) logging system developed at the United States Geological Survey (USGS) for use in remote polar regions. We discuss calibration, operational and data-processing procedures, and present an analysis of the measurement errors. The system is modular to facilitate calibration procedures and field repairs. By interchanging logging cables and temperature sensors, measurements can be made in either shallow air-filled boreholes or liquid-filled holes up to 7 km deep. Data can be acquired in either incremental or continuous-loggi

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Clow, Gary D., Richard W. Saltus, and Edwin D. Waddington. "A new high-precision borehole-temperature logging system used at GISP2, Greenland, and Taylor Dome, Antarctica." Journal of Glaciology 42, no. 142 (1996): 576–84. http://dx.doi.org/10.3189/s0022143000003555.

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AbstractWe describe a high-precision (0.1–1.0 mK) borehole-temperature (BT) logging system developed at the United States Geological Survey (USGS) for use in remote polar regions. We discuss calibration, operational and data-processing procedures, and present an analysis of the measurement errors. The system is modular to facilitate calibration procedures and field repairs. By interchanging logging cables and temperature sensors, measurements can be made in either shallow air-filled boreholes or liquid-filled holes up to 7 km deep. Data can be acquired in either incremental or continuous-loggi

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Kenzhetaev, Zhiger, Kuanysh Togizov, Moldir Abdraimova, and Marzhan Nurbekova. "Selecting the rational parameters for restoring filtration characteristics of ores during borehole mining of uranium depositst." Mining of Mineral Deposits 16, no. 3 (2022): 1–10. http://dx.doi.org/10.33271/mining16.03.001.

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Purpose. The research purpose is to increase the efficiency of borehole uranium mining by selecting special decolmating solutions and rational parameters of the technology for influencing the seam near-filter zone of geotechnological boreholes, as well as improving the filtration characteristics of the seam, depending on the mineralogical composition of ores and the structure of sediment-forming materials. Methods. The method of X-ray phase analysis was used to study the powders. The core material samples were studied on transparent sections using a LEICA DM 2500 P microscope. The content of t

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Demezhko, D. Yu, B. D. Khatskevich, N. R. Fakaeva, and A. A. Gornostaeva. "On the Method of temperature Measurements in Borehole Using Precision thermometers." Georesources 26, no. 2 (2024): 92–98. http://dx.doi.org/10.18599/grs.2024.2.8.

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Precise autonomous borehole thermometers (loggers) allow measuring temperature anomalies of small amplitude (up to 1 mK). It significantly expands the range of problems that borehole thermometry can solve in exploration geophysics, hydrogeology, engineering geology, and geoecology. However, thermal logging techniques remain outdated that hinders the effective implementation of the capabilities of these devices. The paper discusses methodological issues of precision temperature measurements in water-filled boreholes. Experimental studies with an autonomous thermometer rBrsolo³ T (RBR Ltd., Cana

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Wang, Xinyi, Guang Yang, Qi Wang, Junzhi Wang, Bo Zhang, and Jianwang Wang. "Research on Water-Filled Source Identification Technology of Coal Seam Floor Based on Multiple Index Factors." Geofluids 2019 (March 31, 2019): 1–9. http://dx.doi.org/10.1155/2019/5485731.

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According to the No. 13 Mine of Pingdingshan Coal Co. Ltd., the fault dimension of the study area is calculated based on fractal theory. The four impact factors such as water inflow, water pressure, water inrush coefficient, and fault fractal dimension of 21 water boreholes are used as evaluation indices, and a mathematical model for identifying the water-filled source of the coal seam floor is established by coupling an entropy weight method and fuzzy variable set theory. The model is used to identify the water-filled source of 7 boreholes, which provide a reliable reference for the identific

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Oldenborger, Greg A., Garry K. C. Clarke, and Dave H. D. Hildes. "Hydrochemical coupling of a glacial borehole–aquifer system." Journal of Glaciology 48, no. 162 (2002): 357–68. http://dx.doi.org/10.3189/172756502781831232.

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AbstractMeasurements of the electrical conductivity of subglacial water provide a useful complement to measurements of pressure and turbidity. In the summer season, fluctuations of conductivity can be attributed to changes in water transport, water provenance and subglacial residence time. These explanations are unlikely to apply during the winter season because surface melt sources are not active and the subglacial water system is predominantly unconnected. Thus, fluctuations in water conductivity during the winter months seem paradoxical. To introduce a quantitative basis for comprehending s

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The, Duc Ngo, Thang Dam Trong, and Thuy Ngo Ngoc. "Research on the method of measuring blasting stress waves in water-filled boreholes." Edelweiss Applied Science and Technology 9, no. 3 (2025): 1692–704. https://doi.org/10.55214/25768484.v9i3.5680.

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Accurately measuring stress waves generated during blasting is crucial for understanding rock failure mechanics. Traditional methods rely on large water-filled pits for measurement, which are costly and impractical for small-scale experiments. This study introduces a novel approach using water pressure sensors in small-diameter (14 mm) boreholes, providing a cost-effective and scalable alternative. Numerical simulations and experimental tests were conducted to validate this method. A conversion coefficient of 0.598 was derived to translate borehole measurement results into equivalent values fo

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Schoenberg, Michael. "Fluid and solid motion in the neighborhood of a fluid‐filled borehole due to the passage of a low‐frequency elastic plane wave." GEOPHYSICS 51, no. 6 (1986): 1191–205. http://dx.doi.org/10.1190/1.1442174.

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The exact problem of the interaction of an arbitrary plane wave in a homogeneous elastic medium with a fluid‐filled circularly cylindrical borehole is formulated to analyze three‐axis, full‐waveform borehole seismic data. The plane elastic wave (which may be incident upon the borehole from any direction) is partially scattered around the hole and an acoustic field is induced in the borehole fluid. Since seismic wavelengths tend to be much larger than diameters of boreholes, the exact solution may be expanded in powers of Ω (a small number), the incident wavenumber times the borehole radius. In

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Okhuebor, Shadrach Osalumhense. "The Quality And Effect Of Borehole Water Proliferation In Benin City, Nigeria And Its Public Health Significance." Advances in Microbiology Research 4, no. 1 (2020): 1–5. http://dx.doi.org/10.24966/amr-694x/100013.

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Water is life, essential for human existence, and its importance for individual health as well as the well-being of a nation and access to good quality water cannot be overemphasized. Waer makes up about 70% of the earth’s surface and about 97% of this volume of earth’s surface water is contained in the oceans, only about 0.3-0.8% makes up underground water. Ground water is the water beneath the surface where all the voids in the rocks and soil are filled. It is a source of water for wells, boreholes and springs. A borehole is a hydraulic structure which when properly designed and constructed,

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Xue, Tianchen, Juha Jokisalo, Risto Kosonen, et al. "Numerical modeling and validation of a large-scale borehole thermal energy storage system in Finland." E3S Web of Conferences 362 (2022): 06003. http://dx.doi.org/10.1051/e3sconf/202236206003.

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With the increasing demand in reducing carbon dioxide emissions, utilizing thermal energy storage technology, including borehole thermal energy storage (BTES), has become an efficient way to improve energy efficiency. Accurate modelling of the BTES is crucial to correctly predict the BTES performance in the building energy simulation. In this study, a large-scale BTES used for an educational building in Finland, was modelled in the IDA ICE 4.8. The BTES consists of 74 groundwater-filled boreholes with 310 m depth. The boreholes were installed with single U-tube heat exchangers. The BTES model

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Kulessa, Bernd, Bryn Hubbard, Mike Williamson, and Giles H. Brown. "Hydrogeological analysis of slug tests in glacier boreholes." Journal of Glaciology 51, no. 173 (2005): 269–80. http://dx.doi.org/10.3189/172756505781829458.

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AbstractSlug testing allows estimation of subglacial hydraulic properties by evaluating the response of a coupled borehole–subglacial flow system to an artificial displacement of its steady-state hydraulic head. However, existing models developed specifically for application to slug-test data collected in glacier boreholes are challenging to apply in practice. Here, we demonstrate that conventional linear methods, which are relatively readily applicable and widely used in groundwater studies, can also be used to estimate subglacial hydraulic properties. Overdamped, underdamped and critically d

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George, P. A., Akani, N. P., and Ugboma, C. J. "Effects of Methanolic Ginger and Garlic Extracts on Biofilm Forming Staphylococcus aureus Isolated from Borehole Water." South Asian Journal of Research in Microbiology 16, no. 3 (2023): 21–27. http://dx.doi.org/10.9734/sajrm/2023/v16i3309.

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This study investigated the effect of Zingiber officinale (Ginger) and Allum sativum (Garlic) on biofilm forming Staphylococcus aureus isolated from selected boreholes in Port Harcourt city Local Government Area of Rivers State. Twenty four water samples were collected from 4 randomly selected borehole. Borikiri had the highest number of isolates that produced biofilm, while Elelennwo had the lowest number. Out of 23 isolates of Staphylococcus aureus, 14 were positive for biofilm production. Hemolysis production range of these isolates was from alpha, beta and gamma. Filter paper disc were ino

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Mueller, Christof, Gilles Bellefleur, Erick Adam, Gervais Perron, Marko Mah, and Dave Snyder. "Performance of low-fold scalar migration for downhole seismic imaging of massive sulfide ore deposits at Norman West, Sudbury, Canada." GEOPHYSICS 77, no. 5 (2012): WC3—WC13. http://dx.doi.org/10.1190/geo2011-0482.1.

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The Downhole Seismic Imaging consortium conducted two consecutive vertical seismic profiling surveys in the Norman West mining camp (Sudbury, Canada) in 1998 and 1999. These were aimed toward imaging a massive sulfide ore deposit situated within the footwall of the Sudbury Igneous Complex (SIC). Three-component seismic data were acquired in four boreholes with variable signal-to-noise ratio and poor polarization quality. Consequently, the images suffered from strong azimuthal ambiguity. A strike filter, passing only reflections originating from within the SIC, was applied during migration to e

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Yahaya, Tajudeen, Mutiyat Kehinde Adewale, Abdulgafar Bala Ibrahim, et al. "Abundance, characterization, and health risk evaluation of microplastics in borehole water in Birnin Kebbi, Nigeria." Environmental Analysis Health and Toxicology 39, no. 2 (2024): e2024017. http://dx.doi.org/10.5620/eaht.2024017.

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Microplastic pollution has become a global menace, and water, being a major "sink" for pollutants, represents a significant source of human exposure. This study aimed to assess the safety of borehole water in Birnin Kebbi, Nigeria, specifically concerning microplastic pollution. Water samples were collected from boreholes in selected areas, including Bayan Kara, Malali, Rafin Atiku, Aliero Quarters, GwadanGaji, FUBK Takeoff Site, Kalgo Market, and Tarasa. Microplastics were extracted from the water samples through filtration using glass fiber filter papers, and were subsequently subjected to s

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Zagorodnov, V., and L. G. Thompson. "Thermal electric ice-core drills: history and new design options for intermediate-depth drilling." Annals of Glaciology 55, no. 68 (2014): 322–30. http://dx.doi.org/10.3189/2014aog68a012.

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AbstractIce coring of temperate and polythermal glaciers demonstrates some limitations of most electromechanical (EM) and thermal electric (TE) drills. Most TE drills are heavy, require a heavy power system, work slowly and cannot operate in boreholes going through the cold–temperate ice transition. Antifreeze thermal electric drills (ATED) are capable of operating in polar ice caps, polythermal and temperate glaciers, in boreholes filled with water and/or hydrophilic fluids. Performance of the ATED drill can be improved by using an open-top core barrel and low-power and narrow-kerf coring hea

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Pokhrel, Rama Mohan, and Takashi Kiyota. "GIS based study on liquefaction-induced soil subsidence, a case from Urayasu area, Chiba, Japan." Journal of Nepal Geological Society 51 (December 31, 2016): 55–58. http://dx.doi.org/10.3126/jngs.v51i0.24092.

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Urayasu City in Chiba prefecture, Japan, which is composed of young reclaimed land. Following the 2011 off the Pacific Coast of Tohoku Earthquake (M=9), severe liquefaction-induced ground subsidence was extensively observed in this young filled land. The major problems associated with liquefaction and ground subsidence like tilting of houses, buckling of roads and lifelines cut off were commonly observed. Therefore, a detailed study on possibility and amount of ground subsidence is essential to carry out in such area. In this paper, a variation of ground subsidence is studied after severe liqu

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