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Journal articles on the topic 'Pulse neutron-neutron logging'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

Fedak, Іhor, R. Vasylyna, Vitalii Uskov, and R. Malyk. "Features of geophysical monitoring of current oil and gas saturation of productive formations." Prospecting and Development of Oil and Gas Fields, no. 4 (November 6, 2023): 79–88. http://dx.doi.org/10.69628/pdogf/4.2023.79.

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The process of developing oil and gas fields requires continuous monitoring of the current oil and gas saturation of productive reservoirs. Monitoring the current oil and gas saturation allows for effective hydrocarbon recovery. Solving this problem under the conditions of a cased hole significantly limits the suite of geophysical methods, which are the main source of information about the conditional characteristics of reservoirs. The most effective geophysical methods for determining the current oil and gas saturation of a productive reservoir in a producing well is deemed to be the methods

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2

Tang, Jian, Meng Liu, Penghui Gao, Rui Qiu, Xinpeng Zhou, and Jie Yan. "Experimental study on pulse characteristics of smaller diameter Penning ion source." Journal of Instrumentation 20, no. 03 (2025): P03006. https://doi.org/10.1088/1748-0221/20/03/p03006.

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Abstract For logging pulsed neutron tube with diameter less than 25 mm, a smaller diameter Penning ion source with a cylindrical plasma volume of Φ8 mm × 9 mm was designed to investigate the pulse characteristics of anode current. The pulse time and amplitude characteristics of anode current as a function of deuterium pressure and anode voltage were studied experimentally. The preferred working parameters for this smaller diameter Penning ion source were suggested, then obtained the pulse amplitude of anode current in the range of 1 mA∼ 3.5 mA, with the shortest pulse delay time of anode curre

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3

Eko, Eko Prastio. "APLIKASI ALAT PULSE NEUTRON LOGGING UNTUK MENENTUKAN ZONA HIDROKARBON BARU DI LAPANGAN X." Jurnal Jaring SainTek 2, no. 2 (2020): 42–50. http://dx.doi.org/10.31599/jaring-saintek.v2i2.318.

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Pengukuran Neutron Porosity pada sumur terbuka (Open Hole) ditujukan untuk mengukur indeks hidrogen yang terdapat pada formasi batuan. Indeks hidrogen didefinsikan sebagai rasio dari konsentrasi atom hidrogen setiap cm3 batuan terhadap kandungan air murni pada suhu 75oF. Neutron Porosity log tidaklah mengukur porositas sesungguhnya dari batuan, melainkan yang diukur adalah kandungan hidrogen yang terdapat pada pori-pori batuan. Secara sederhana, semakin berpori batuan semakin banyak kandungan hidrogen dan semakin tinggi indeks hidrogen. Sehingga, shale yang banyak mengandung hidrogen dap

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Sizov, D. A. "COMPLEMENTARITY OF PULSE NEUTRON LOGGING AND ELECTRIC DIVERGENT LOGGING IN CASED WELLS." Bulletin of Russian academy of natural sciences 23, no. 1 (2023): 65–72. http://dx.doi.org/10.52531/1682-1696-2023-23-1-65-72.

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In production wells, nuclear-physical and electrical logging methods are used to study the backwater space. More well-known and widespread is pulsed neutron logging (PNL) [16] and its modifications. Electric divergent logging (EDC) is considered less common [2] in cased wells. Both methods solve the same problem, but they are still not ideal and have their drawbacks. This article presents the advantages and disadvantages of the PNL and EDC methods in comparison with each other. A significant criterion when choosing the preferred method for determining the current oil and gas saturation is the

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Jingyu, ZHANG, LIN Yanbo, LIU Ping, et al. "Application of Pulse Neutron Oxygen Activation Logging in Carbon Dioxide Injection Wells." Chinese Petroleum and Natural Gas Research 2, no. 3 (2023): 25–32. http://dx.doi.org/10.48014/cpngr.20230520001.

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Carbon dioxide injection to improve oil recovery is an important link in carbon capture, utilization, and storage (CCUS) and an important means of tertiary oil recovery. Conducting gas injection profile logging in injection wells can reflect the inter-and intra-layer suction differences in gas injection wells, reveal the contradictions between injection and production, and provide a basis for gas plugging and profile control; The integrity of the wellbore is an important part of the storage stage of CCUS, which directly determines the burial and storage effect, and wellbore leakage directly af

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Alkhashman, W. Kh, and V. M. Lobankov. "PROBLEMS OF PULSE NEUTRON LOGGING FOR CONTROL PRODUCTION OF OIL RESERVOIRS." Problems of Gathering, Treatment and Transportation of Oil and Oil Products, no. 1 (May 2020): 9. http://dx.doi.org/10.17122/ntj-oil-2020-1-9-17.

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7

Miyazaki, Keiichiro, Daisuke Nakauchi, Takumi Kato, Noriaki Kawaguchi, and Takayuki Yanagida. "Scintillation Properties of Yb²⁺-Doped LiBr Single Crystals." ECS Meeting Abstracts MA2024-02, no. 51 (2024): 3550. https://doi.org/10.1149/ma2024-02513550mtgabs.

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As neutron detectors, 3He proportional counters have generally been used in security, environmental monitoring, medicine, and well-logging fields. The 3He is a product produced during β-decay of 3H. The 3H has generally been used in nuclear weapons, and the supply of 3He decreased due to nuclear disarmament and prohibition of nuclear experiment. However, the demand of the neutron detectors rapidly became high in the security field after September 11th terrorist attacks in 2001, and the demand of 3He became higher than the supply. Therefore, scintillators for neutron detection have been require

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8

Chen, Shanqi, Bin Wu, Zhengyun Dong, et al. "Development of TopMC 1.0 for nuclear technology applications." EPJ Nuclear Sciences & Technologies 11 (2025): 6. https://doi.org/10.1051/epjn/2024033.

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Particle transport plays an important role in nuclear technology applications. As a generalized methodology, Monte Carlo is widely employed for particle transport. We investigated several key difficulties in the field, specifically addressing aspects like voxel modeling, coupled photon-electron transportation, and advanced pulse height tallying methodologies. We have developed some essential technologies to enhance the capabilities of the Multi-functional Program for Neutronics Calculation, Nuclear Design and Safety Evaluation (TopMC). This contribution presents the progress in TopMC’s R&D

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9

Schultz, Ward E., Gordon L. Moake, and Charles E. Jackson. "Field Examples of Ultrasonically-Enhanced Density, Neutron-Porosity, and Caliper Logs Obtained While Drilling." SPE Reservoir Evaluation & Engineering 1, no. 03 (1998): 252–60. http://dx.doi.org/10.2118/36545-pa.

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Abstract Density, Pe, and neutron-porosity measurements made while drilling are extremely sensitive to the distance between the sensors and the borehole wall (standoff). To minimize these effects, an ultrasonic transducer is positioned collinearly with the nuclear sensors. Rapid pulsing of the transducer provides frequent measurements of the standoff. These measurements are used to average the nuclear data in a manner that emphasizes the smallest standoff data. This greatly improves the quality of the density, Pe, and neutron-porosity logs. Additionally, the standoff measurements are used to c

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10

Xie, Bo, Lijiao Zhang, and Shangping Xie. "Esearch on an improved particle swarm optimization algorithm for inversion of element yield in pulse neutron gamma formation element logging." Nuclear Technology and Radiation Protection 40, no. 1 (2025): 37–46. https://doi.org/10.2298/ntrp2501037x.

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The physical problem of element yield inversion is transformed into a mathematical problem of solving overdetermined equations, then the particle swarm optimization algorithm is used to find the optimal solution of the system of equations to obtain the yield of formation elements. During the inversion process, relevant parameters such as the objective function, inertia weight factor, and learning factor are designed and optimized to make the particle swarm optimization algorithm more suitable for gamma spectrum signal processing, avoiding local extremum problems during the optimization process

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11

PETROKUSHYN, Oleh, and Iryna BEZRODNA. "PULSED NEUTRON LOGGING IN THE WORLD AND IN UKRAINE: BEGGINING, ESTABLISHMENT, PRESENT." Visnyk of Taras Shevchenko National University of Kyiv. Geology, no. 2 (109) (2025): 31–39. https://doi.org/10.17721/1728-2713.109.04.

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Background. At present, most of the oil and gas fields in Ukraine are depleted, requiring the operator companies in Ukraine to constantly monitor saturation levels and fluid movement withing the reservoirs as these are crucial pieces of information for optimizing and planning further production strategies. Methods. The development and current state of pulsed neutron logging as one of the main methods of monitoring the development of oil and gas fields is described in the paper. Results. The article focuses on the history of the establishment of the pulsed neutron logging, starting from 1949. F

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Fitz, Dale. "Evolution of Casedhole Nuclear Surveillance Logging Through Time." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 64, no. 4 (2023): 473–501. http://dx.doi.org/10.30632/pjv64n4-2023a1.

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Nuclear logging techniques have played a critical role in the evaluation and surveillance of hydrocarbon reservoirs since the introduction of the gamma ray log in 1939. This paper reviews the history of key developments in nuclear logging that led to improved methods to identify gas-oil (GOC), gas-water (GWC), and oil-water (OWC) contacts in steel-cased wells, as well as methods to identify gas, steam, and waterflood front encroachment, calculate their saturations, and recognize problems in efficient reservoir depletion. This paper will focus solely on nuclear methods used to directly identify

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13

Gu, Caiyun, Peng Zhao, Li Wang, and Hongxia Guo. "Technical Application of Petroleum Logging Instruments in Marine Logging." Polish Maritime Research 25, s3 (2018): 22–28. http://dx.doi.org/10.2478/pomr-2018-0108.

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Abstract To solve the problem of offshore oilfield development, based on the newly introduced pulsed neutron oxygen activation logging instrument, the application research of test design and interpretation method was carried out and applied to actual production. The structure, technical indicators and logging principles of pulsed neutron oxygen activation logging tools were introduced. The test design under different well conditions was studied, including general positive and negative injection, oil sleeve injection, single oil pipe configuration and multitubing configuration. A large amount o

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14

Dong, Wu, Hai Min Guo, and Xin Qi. "The Disposal of Tailed Peak in the Time Spectrum of Pulsed Neutron Oxygen Activation Logging." Applied Mechanics and Materials 318 (May 2013): 567–71. http://dx.doi.org/10.4028/www.scientific.net/amm.318.567.

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In the time spectrum of impulse oxygen activation logging, grave tailed peak occurs when the viscosity of polymer is high and the velocity of the flow is not even. The calculation of transit time, flow velocity as well as flow volume depends on the duration of the oxygen activation peak, so the disposal of the grave tailed peak in the time spectrum of impulse oxygen activation logging is critical. And an effective way to deal with tailed peak will improve the calculation accuracy of transit time and flow velocity. In this paper, the problem of tailed peak is studied, then an algorithm combinin

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15

Dunn, Keh‐Jim. "A diffusion model for pulsed neutron logging." GEOPHYSICS 54, no. 1 (1989): 100–113. http://dx.doi.org/10.1190/1.1442567.

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Based on Polyachenko’s formulation, the complete solution of the boundary value problem for pulsed neutron logging is derived for a centralized tool model. The solution is more general than Polyachenko et al.’s earlier solution in that the unrealistic assumption of zero thermal neutron lifetime in the fluid‐filled borehole is eliminated and that, in addition to the formation signal, the borehole signal is also considered. For formations of weak absorption, the theoretical solution predicts features in the gamma‐ray die‐away curve similar to those observed in real logging cases. For formations

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16

Jambunathan, Venkataraman, FNU Suparman, Zhipeng Liu, Weijun Guo, and Daniel Dorffer. "Cased-hole interpretation workflow for determining residual oil saturation for mature fields." Interpretation 3, no. 1 (2015): SA135—SA142. http://dx.doi.org/10.1190/int-2014-0046.1.

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Formation evaluation for mature oil fields remains a challenge for operators. Rock-petrophysical properties present large uncertainties following years of production. Formation evaluation becomes even more challenging when there is a lack of open-hole logging data as is typically the case. Logging programs for cased-hole formation evaluation are limited by the size of the well completion. In addition, a metallic casing often prevents the effective use of electric measurements. However, pulsed-neutron tools (PNTs) are a viable option for mature fields. We developed a brief review of PNT theory.

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17

Pemper, Richard. "A History of Nuclear Spectroscopy in Well Logging." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 61, no. 6 (2020): 523–48. http://dx.doi.org/10.30632/pjv61n6-2020a1.

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This paper provides a history of nuclear spectroscopy in well logging from its beginnings in 1939 up until the present day. After the invention and implementation of gamma ray logging, this paper traces the technological development of the pulsed-neutron capture (sigma) log, the spectral gamma ray log, the carbon-oxygen log, tracer identification logs, small-diameter reservoir characterization tools, and finally the geochemical log. The key to the science of nuclear spectroscopy has been the detection of gamma rays, their energies, and the identity of their parent atomic nuclei. From this, the

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18

ZHANG, Feng, Jian-Ping XU, Ling-Mei HU, Chun-Hong XIU, and Jian-Meng SUN. "Monte Carlo Simulation for the Pulsed Neutron-Neutron Logging Method." Chinese Journal of Geophysics 50, no. 6 (2007): 1654–61. http://dx.doi.org/10.1002/cjg2.1186.

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19

Luycx, Mathilde, and Carlos Torres-Verdín. "Rapid forward modeling of logging-while-drilling neutron-gamma density measurements." GEOPHYSICS 83, no. 6 (2018): D231—D246. http://dx.doi.org/10.1190/geo2018-0142.1.

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Neutron-activated gamma-ray (neutron-gamma) logging-while-drilling (LWD) measurements deliver bulk density estimates without using a chemical source. The assessment of bulk density is based on neutron-induced non-capture gamma rays, corrected for neutron transport by combining particle counts acquired at two gamma-ray detectors and two fast neutron detectors. Particle counts from all four detectors are necessary to deliver one density measurement whose accuracy compares well to that of the gamma-gamma density instruments. Thereafter, borehole environmental effects are mitigated with empirical

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20

Wei, Chao, Qiu Yue Sun, Yuan Ying Qiu, and Jun Jie Ye. "Dynamic Analysis and Structural Optimization for a Logging while Drilling Neutron Instrument." Applied Mechanics and Materials 684 (October 2014): 70–75. http://dx.doi.org/10.4028/www.scientific.net/amm.684.70.

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Logging while drilling (LWD) neutron instrument is a core equipment of the pulsed neutron logging technology, its anti-vibration performance has a direct impact on the measurement accuracy. For improving the anti-vibration performance, a reverse design method was proposed to avoid the resonance region due to increasing structural stiffness. The dynamic performance of the original instrument was analyzed, the weaknesses of its anti-vibration performance were determined and its topologies were improved. Moreover, the structural parameters of the instrument were optimized to raise the structural

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21

Leung, Ka-Ngo. "New Mini Neutron Tubes with Multiple Applications." Journal of Nuclear Engineering 5, no. 3 (2024): 197–208. http://dx.doi.org/10.3390/jne5030014.

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Recent experimental investigations have demonstrated that a substantial amount of H−/D− ions can be formed by thermal desorption processes. Based on these new findings, new mini axial and coaxial-type neutron tubes have been developed for the production of high or low-energy neutrons via the d-d, d-10B, d-7Li or p-7Li nuclear reactions. By operating these mini neutron tubes with a high frequency AC high-voltage supply, short pulses of high intensity neutron beams can be generated. Multiple applications, such as carbon and well logging, neutron imaging, cancer therapy, medical isotope productio

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Wang, Xin-guang, Dan Liu, and Feng Zhang. "Development of pulsed neutron uranium logging instrument." Review of Scientific Instruments 86, no. 3 (2015): 034501. http://dx.doi.org/10.1063/1.4913660.

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Luycx, Mathilde, and Carlos Torres-Verdín. "Physics, applications, and limitations of borehole neutron-gamma density measurements." GEOPHYSICS 84, no. 1 (2019): D39—D56. http://dx.doi.org/10.1190/geo2018-0088.1.

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Radioactive chemical sources can pose security, health, and environmental risks when used to estimate rock porosity in situ. The oil industry has been developing solutions to eliminate radioactive chemical sources in borehole nuclear logging. Pulsed neutron generators have successfully replaced chemical sources in neutron tools, but cesium-137 is still mainly used for borehole density measurements. Neutron-activated gamma-ray measurements (neutron-gamma) are a possible alternative to radioactive chemical sources in density tools. Despite recent advances, the measurement faces challenges regard

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24

Aflyatunov, R. R., V. G. Bazarevskaya, A. F. Safarov, et al. "Oil Potential of Sargaevskian Horizon in Romashkinskoe Field Areas." Georesources 27, no. 2 (2025): 255–63. https://doi.org/10.18599/grs.2025.2.19.

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High extent of subsurface exploration activities in the Republic of Tatarstan results in ever increasing scarcity of hydrocarbon resources available for the purposes of oil production. Under such conditions, the search for and development of overlooked reservoirs within existing producing fields become of great importance. The Sargaevskian horizon is associated with unique Domanic deposits which are considered the main oil source rocks within the Volga-Ural petroleum province. Domanic rocks are capable of both generating and accumulating hydrocarbons. This paper analyses all available G&G

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McGlynn, Ian, Toyli Anniyev, Feyzi Inanc, et al. "Development and Baseline Comparison of a New Pulsed-Neutron Spectroscopy Tool for Carbon- Oxygen Analysis and Three-Phase Saturation Monitoring." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 64, no. 6 (2023): 900–918. http://dx.doi.org/10.30632/pjv64n6-2023a7.

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A new slim multidetector pulsed-neutron wireline-logging tool has been developed for openhole or casedhole formation evaluation saturation analysis and time-lapse monitoring. With a greater neutron source output and high-spectral resolution gamma ray detectors, the tool can be operated with reduced uncertainty or faster logging speeds. New, fully programable digital electronics provide a range of acquisition modes optimized for specific formation evaluation objectives. Neutrons are generated from a high-output pulsed-neutron generator, which propagates radially outward, passing through the bor

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Randall, R. R., T. P. Gray, G. C. Craik, and E. C. Hopkinson. "A New Digital Multiscale Pulsed Neutron Logging System." SPE Formation Evaluation 2, no. 04 (1987): 395–400. http://dx.doi.org/10.2118/14461-pa.

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Schultz, W. E., H. D. Smith, J. L. Verbout, J. R. Bridges, and G. H. Garcia. "A borehole corrected pulsed neutron well logging system." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 10-11 (May 1985): 1023–27. http://dx.doi.org/10.1016/0168-583x(85)90162-4.

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28

Li, Chenyang, and Xiaoli Zhang. "Geophysical Monitoring Technologies for the Entire Life Cycle of CO2 Geological Sequestration." Processes 12, no. 10 (2024): 2258. http://dx.doi.org/10.3390/pr12102258.

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Geophysical monitoring of CO2 geological sequestration represents a critical technology for ensuring the long-term safe storage of CO2 while verifying its characteristics and dynamic changes. Currently, the primary geophysical monitoring methods employed in CO2 geological sequestration include seismic, fiber optic, and logging technologies. Among these methods, seismic monitoring techniques encompass high-resolution P-Cable three-dimensional seismic systems, delayed vertical seismic profiling technology, and four-dimensional distributed acoustic sensing (DAS). These methods are utilized to mon

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侯, 振永. "Monte Carlo Simulation Result of Pulsed Neutron-neutron Logging Method for Offshore Oilfield." Journal of Oil and Gas Technology 41, no. 06 (2019): 1–8. http://dx.doi.org/10.12677/jogt.2019.416086.

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Jacobson, Larry, Venkataraman Jambunathan, Zhipeng Liu, and Weijun Guo. "Technical advances in pulsed-neutron interpretation for cased-hole logging: Physics, interpretation, and log examples." Interpretation 3, no. 1 (2015): SA159—SA166. http://dx.doi.org/10.1190/int-2014-0174.1.

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Recently developed multidetector pulsed-neutron tools (MDPNTs — a term describing a pulsed-neutron tool with at least three detectors) can provide three-phase formation fluid analysis in cased wells. These tools are 43 mm (1 11/16 in.) or 54 mm (2 1/8 in.) in diameter and can be logged in or below most tubing sizes. We reviewed traditional oil- and water-saturation techniques as well as indirect gas-saturation techniques, and we compared them with recently developed direct gas-saturation techniques, now available from MDPNTs. A log example developed the data verification and interpretation pro

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Fedoryshyn, D. D., О. М. Trubenko, S. D. Fedoryshyn, and А. О. Trubenko. "Reliability of results of use of complex geophysical studies in the process of control of development of oil and gas deposits." Oil and Gas Power Engineering, no. 2(36) (December 29, 2021): 15–22. http://dx.doi.org/10.31471/1993-9868-2021-2(36)-15-22.

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The paper considers modern methods for determining the position of gas-liquid contacts in terrigenous deposits at oil and gas condensate fields in Ukraine. The results of laboratory studies of a representative core collection (87 samples) in the petrophysical laboratory of IFNTUOG made it possible to establish the reservoir parameters and lithological characteristics of reservoir rocks of Carboniferous and Neogene sediments, which made it possible to reliably estimate the reservoir parameters of productive formations. The results of well studies, in particular, obtained during the isolation of

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Miceli, A., G. Festa, G. Gorini, R. Senesi, and C. Andreani. "Pulsed neutron gamma-ray logging in archaeological site survey." Measurement Science and Technology 24, no. 12 (2013): 125903. http://dx.doi.org/10.1088/0957-0233/24/12/125903.

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Khisamutdinov, A. I., and B. V. Banzarov. "Mathematical modeling problems connected with pulsed neutron-gamma logging." Mathematical Models and Computer Simulations 7, no. 1 (2015): 79–93. http://dx.doi.org/10.1134/s2070048215010056.

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Müller, Nadja, T. S. Ramakrishnan, Austin Boyd, and Shinichi Sakruai. "Time-lapse carbon dioxide monitoring with pulsed neutron logging." International Journal of Greenhouse Gas Control 1, no. 4 (2007): 456–72. http://dx.doi.org/10.1016/s1750-5836(07)00071-0.

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Tittle, C. W., Carl Burger, Gary Mathis, and A. F. Veneruso. "Gearhart pulsed neutron logging: The thermal decay log (TDL)." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 10-11 (May 1985): 1038–41. http://dx.doi.org/10.1016/0168-583x(85)90165-x.

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Chen, Guangyao, Lixia Dang, Wenyuan Cai, et al. "Study on Monitoring Reservoir Gas Density by Pulsed Neutron Logging." International Journal of Energy Research 2023 (February 3, 2023): 1–8. http://dx.doi.org/10.1155/2023/1363145.

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In mature multilayer gas reservoirs, it is a common problem to evaluate whether a potential reservoir is still productive after casing. Monitoring of unproduced or developing gas formations can guide production action plans. Intervention in unperforated zones with high gas density can increase gas production, whereas intervention in zones with low gas density is uneconomical. An RPM instrument stratum model was established by using the Monte Carlo method in this study. The model was used to simulate the response characteristics of pulsed neutron logging in a sandstone reservoir with 100% gas s

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Johare, Dzulfadly, Mohd Farid Mohd Amin, Adi Prasodjo, Sarah M. Afandi, and Rusli Din. "New Generation of Pulsed-Neutron Multidetector Comparison in a Challenging Multistack Clastic Reservoir: A Case Study in Brown Field, Malaysia." Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 61, no. 6 (2020): 585–99. http://dx.doi.org/10.30632/pjv61n6-2020a4.

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Running pulsed-neutron logs in Malaysia has previously been plagued by results with high uncertainties, especially in brown fields with complex multistacked clastic reservoirs. Together with a wide range of porosities and permeabilities, the acquired logs quite often tended to yield inconclusive results. In addition, the relatively fresh aquifer water (where salinity varies from 5,000 to 40,000 ppm) makes reservoir fluid typing and distinguishing between oil and water even more challenging. As a result, the inconsistencies and uncertainties of the results tend to leave more questions than answ

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Ajayi, Oyinkansola, Carlos Torres-Verdín, and William E. Preeg. "Inversion-based interpretation of logging-while-drilling gamma-ray spectroscopy measurements." GEOPHYSICS 81, no. 1 (2016): D9—D34. http://dx.doi.org/10.1190/geo2015-0293.1.

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Neutron-induced spectroscopy measurements are commonly used to quantify in situ elemental compositions of rocks from the processing of measured gamma-ray energy spectra. However, geometric effects on the measured spectroscopy logs, such as thin beds, dipping beds, and deviated well trajectories, can cause shoulder-bed averaging that compromises the assessment of the true layer elemental composition. We have developed an inversion-based interpretation method to evaluate layer elemental compositions from spectroscopy measurements acquired with a commercial 14-MeV pulsed-neutron logging-while-dri

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Wang, Hu, Wensheng Wu, Tianzhi Tang, et al. "A new method for calculating bulk density in pulsed neutron-gamma density logging." GEOPHYSICS 85, no. 6 (2020): D219—D232. http://dx.doi.org/10.1190/geo2018-0821.1.

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Formation density is one of the most important parameters in formation evaluation. Radioisotope chemical sources are used widely in conventional gamma-gamma density (GGD) logging. Considering security and environmental risks, there has been growing interest in pulsed neutron generators in place of the radioactive-chemical source in using bulk-density measurements. However, there still is the requirement of high accuracy of the neutron-gamma density (NGD) calculation. Pair production is one of the factors influencing the accuracy of the results, which should be considered. We have adopted a met

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Queißer, Manuel, Matthew Tudor, Jens Schubert, et al. "Spectrometric borehole logging in mineral exploration and mining." Leading Edge 43, no. 4 (2024): 246–57. http://dx.doi.org/10.1190/tle43040246.1.

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Borehole logging tools based on pulsed neutron technology are used to infer geophysical parameters such as bulk density. If fitted with a gamma-ray spectrometer, they may also measure elemental mass fractions of a variety of formation elements. Spectrometric borehole logging tools of this kind are established in the oil and gas industry. With the demand for mineral resources surging, cost- and time-efficient measurement techniques are increasingly needed in mineral exploration. Their ability to detect multiple elements that are building blocks of minerals makes spectrometric borehole logging t

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Tian, Lili, Feng Zhang, Zeyun Wu, et al. "A new diffusion effect correction method in pulsed neutron capture logging." Journal of Petroleum Science and Engineering 204 (September 2021): 108673. http://dx.doi.org/10.1016/j.petrol.2021.108673.

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Thern, Holger F., and Songhua Chen. "DDTW-A Method for Gas Reservoir Evaluation Using Dual Wait-Time NMR and Density Log Data." SPE Reservoir Evaluation & Engineering 4, no. 04 (2001): 289–96. http://dx.doi.org/10.2118/72501-pa.

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Summary Accurate estimates of porosity, fluid saturations, and in-situ gas properties are critical for the evaluation of a gas reservoir. By combining data from a dual wait-time (DTW) nuclear magnetic resonance (NMR) log and a density log, these properties can be determined more reliably than by either of the data alone. The density and NMR dual wait-time (DDTW) technique, introduced in this paper, is applicable to reservoirs where the pore-filling fluid consists of a liquid phase and a gas phase. The low proton density of the gas phase causes a reduction in the NMR signal strength resulting i

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Egorova, Elena Valer'evna, Vladislav Alexandrovich Shvyrev, and Tat'yana Sergeevna Silkina. "Proposal for the modernization of import-substituting geophysical equipment “AINK-PL” production N. L. Dukhov Scientific Research Institute of Automation." Oil and gas technologies and environmental safety 2024, no. 2 (2024): 30–36. http://dx.doi.org/10.24143/1812-9498-2024-2-30-36.

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Geophysical research methods are actively used in the exploration of hydrocarbon deposits, the peculiarity of which is the remoteness of the studied objects from the observer's point. The main purpose of geophysical research is to obtain, transmit, and process information about the topography, soil composition, and quantity and location of groundwater. Such studies are carried out at the end of drilling the well of the exact cut interval using devices lowered into the well on a special geophysical cable. Currently, equipment is being actively developed that helps geophysicists determine the pa

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Mauborgne, Marie-Laure, Rubi Rodriguez, Françoise Allioli, et al. "Enhancing Accuracy and Range of Sourceless Density." (Petrophysics – The SPWLA Journal of Formation Evaluation and Reservoir Description 65, no. 6 (2024): 929–43. https://doi.org/10.30632/pjv65n6-2024a7.

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Formation density is a fundamental rock property and is a critical input in reservoir evaluations. Determining this critical measurement accurately requires utilizing a high-activity radioactive source in the drilling bottomhole assembly (BHA). The sourceless neutron-gamma density (sNGD) measurement based on a pulsed-neutron generator was introduced in logging-while-drilling (LWD) operations more than a decade ago, eliminating the need for radioactive source and the challenges associated with its handling, transportation, storage, and abandonment. The current sNGD algorithm has limitations in

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Carpenter, Chris. "Water-Shutoff Technique Extends Productive Life Cycle of Cretaceous Sandstone." Journal of Petroleum Technology 73, no. 04 (2021): 51–52. http://dx.doi.org/10.2118/0421-0051-jpt.

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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 199070, “Water-Shutoff Technique Extends the Productive Life Cycle of Cretaceous U Sandstone: The Iro Field Case in Ecuador,” by Luis Roberto Bailón, SPE, Ney Holger Orellana, SPE, and Santiago Villegas, Repsol, et al., prepared for the 2020 SPE Latin American and Caribbean Petroleum Engineering Conference, originally scheduled to be held in Bogota, Colombia, 17-19 March. The paper has not been peer reviewed. The water-shutoff technique is used in some wells of the U reservoir in the Iro field of t

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Watson, J. T., W. W. Carpenter, James F. Carroll, and B. C. Smith. "Gravel-Pack Field Examples of a New Pulsed-Neutron-Activation Logging Technique." SPE Formation Evaluation 6, no. 04 (1991): 500–504. http://dx.doi.org/10.2118/20877-pa.

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Yu, Huawei, Jianmeng Sun, Jiaxin Wang, and Robin P. Gardner. "Accuracy and borehole influences in pulsed neutron gamma density logging while drilling." Applied Radiation and Isotopes 69, no. 9 (2011): 1313–17. http://dx.doi.org/10.1016/j.apradiso.2011.04.023.

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Watson, J. T., W. W. Carpenter, J. F. Carroll, and B. C. Smith. "Gravel-pack field examples of a new pulsed-neutron-activation logging technique." International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts 29, no. 4 (1992): 236. http://dx.doi.org/10.1016/0148-9062(92)90764-q.

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Wang, Xinguang, Feng Zhang, Huanying Ma, and Liangwen Zhou. "A novel borehole/annulus holdup calculation method based on pulsed neutron logging." Applied Radiation and Isotopes 168 (February 2021): 109479. http://dx.doi.org/10.1016/j.apradiso.2020.109479.

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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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