Relevant bibliographies by topics / Wellbore stability

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Academic literature on the topic 'Wellbore stability'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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Journal articles on the topic "Wellbore stability"

1

Akl, Sherif A. Y., and Andrew J. Whittle. "Stability analyses for deviated wellbores in unconsolidated cross-anisotropic formations." Canadian Geotechnical Journal 53, no. 9 (2016): 1450–59. http://dx.doi.org/10.1139/cgj-2015-0456.

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Production of oil from shallow reservoirs typically involves drilling highly deviated wells through unconsolidated (or poorly lithified) rocks or clays. This paper describes numerical analyses of the deformations and stability of deviated wellbores within a K0-consolidated clay. The analyses consider planar deformations in the plane orthogonal to the wellbore using a quasi three-dimensional (3D) finite element model that represents coupled flow and deformations within the soil mass. Cross-anisotropic mechanical properties of the clay are described by a generalized effective stress model, MIT-E3, with parameters previously calibrated from laboratory thick-walled cylinder tests. The analyses compute the relationship between the drilling mud pressure and wellbore stability associated with either the onset of localized failure mechanisms or large plastic deformations around the cavity. The results show that short-term, undrained stability requires mud pressures in excess of the in situ formation pore pressures for more highly deviated wellbores at inclinations greater than 45°. The analyses examine the mechanisms for further destabilization, due to consolidation within the formation, and how they are affected by drainage conditions at the wellbore wall. The results provide qualitative information for the design and control of drilling operations for deviated wellbores in unconsolidated formations.
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2

Kremieniewski, Marcin. "Ultra-Lightweight Cement Slurry to Seal Wellbore of Poor Wellbore Stability." Energies 13, no. 12 (2020): 3124. http://dx.doi.org/10.3390/en13123124.

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The article presents the recipe for ultra-lightweight cement slurry for wellbore sealing. In ordinary lightweight cement slurries, the addition of microspheres and a large amount of water are used to maintain rheological parameters. This is a problem because the light particles of microspheres segregate. The cement sheath from such a cement slurry has an anisotropic microstructure and does not stabilize the casing column. In the new ultra-light cement slurry, 60% aluminosilicate microspheres and a large amount of water were used. The ultra-light weight slurry has a density below 1.2 g/cm3. This cement slurry does not segregates and in the sedimentation stability test has the same density at all measuring points. The cement slurry, despite the larger amount of water, has the same filtration as the control sample. The technological parameters of the slurry are adapted to the borehole conditions. Cement slurry is a ready-made application to seal a borehole with poor wellbore stability under conditions of 40 °C and 10 MPa pressure. The cement sheath structure in the wellbore after binding is homogeneous. The use of such slurry allows to reduce the risk of wall damage in wellbores of poor stability.
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3

Shi, Xiang-Chao, Xu Yang, Ying-Feng Meng, and Gao Li. "Wellbore stability analysis in chemically active shale formations." Thermal Science 20, suppl. 3 (2016): 911–17. http://dx.doi.org/10.2298/tsci16s3911s.

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Maintaining wellbore stability involves significant challenges when drilling in low-permeability reactive shale formations. In the present study, a non-linear thermo-chemo-poroelastic model is provided to investigate the effect of chemical, thermal, and hydraulic gradients on pore pressure and stress distributions near the wellbores. The analysis indicates that when the solute concentration of the drilling mud is higher than that of the formation fluid, the pore pressure and the effective radial and tangential stresses decrease, and v. v. Cooling of the lower salinity formation decreases the pore pressure, radial and tangential stresses. Hole enlargement is the combined effect of shear and tensile failure when drilling in high-temperature shale formations. The shear and tensile damage indexes reveal that hole enlargement occurs in the vicinity of the wellbore at an early stage of drilling. This study also demonstrates that shale wellbore stability exhibits a time-delay effect due to changes in the pore pressure and stress. The delay time computed with consideration of the strength degradation is far less than that without strength degradation.
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4

Mehrabian, Amin. "The Stability of Inclined and Fractured Wellbores." SPE Journal 21, no. 05 (2016): 1518–36. http://dx.doi.org/10.2118/180910-pa.

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Summary The theory of linear-elastic fracture mechanics is used to develop an analytical solution for a wellbore in an isotropic elastic medium when drilled inclined to a general state of 3D far-field stress, and attached to which are an arbitrary number of N straight and axially aligned fractures. Axial alignment refers to the special case where the borehole axis is the existing common interface of all planes defined by the fracture faces. The solution uses a familiar load decomposition and coordinate-transform scheme. Within the fracture-mechanics context of the analysis, this scheme translates into a set of three fundamental subproblems comprising a uniaxial stress problem, together with an in-plane mixed mode (Modes I and II), and a Mode III antiplane-crack/cavity-interaction problem. The overall solution is obtained by superposing the solutions to these subproblems. A numerical example is presented to demonstrate its usefulness in the stability analysis of inclined and fractured wellbores. Attention has been directed toward the underlying significance that the results would bring in fundamental understanding of lost-circulation events. For this purpose, the criteria for a possible extended margin of the mud weight that secures stable states of a fractured wellbore are recognized and quantified. These criteria include the wellbore-wall refracturing and the existing fractures propagation.
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5

Pla´cido, Joa˜o Carlos R., He´lio M. R. Santos, and Yadira Diaz Galeano. "Drillstring Vibration and Wellbore Instability." Journal of Energy Resources Technology 124, no. 4 (2002): 217–22. http://dx.doi.org/10.1115/1.1501302.

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Wellbore instability can be attributed to several causes. The ones thought to be most important include: chemical interaction with the drilling fluid, high tectonic stresses, and insufficient mud weight. Drillstring vibration, although not traditionally addressed as a potential cause, might influence the stability of wellbores drilled in specific formations. Evidence of the strong correlation between severe vibration and wellbore instability has been reported in the literature. However, a more thorough understanding of the phenomenon is still lacking. This paper describes a study that has been developed by PETROBRAS focusing on how drillstring vibration impacts wellbore instability. Vibration has been monitored in some wells, and events related to borehole enlargement were observed. Four field cases are presented showing a strong correlation between high vibration level and wellbore enlargement in different lithologies. Other sources of wellbore enlargement have also been identified, and they can be clearly separated from vibration.
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6

Kwakwa, Kwabena. "Overview: Wellbore Stability (October 2002)." Journal of Petroleum Technology 54, no. 10 (2002): 56. http://dx.doi.org/10.2118/1002-0056-jpt.

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7

Bybee, Karen. "Time-Dependent Wellbore- Stability Predictions." Journal of Petroleum Technology 53, no. 02 (2001): 29–30. http://dx.doi.org/10.2118/0201-0029-jpt.

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8

Kwakwa, Kwabena. "Overview: Wellbore Stability (May 2001)." Journal of Petroleum Technology 53, no. 05 (2001): 54. http://dx.doi.org/10.2118/0501-0054-jpt.

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9

Chen, Guizhong, and Russell T. Ewy. "Thermoporoelastic Effect on Wellbore Stability." SPE Journal 10, no. 02 (2005): 121–29. http://dx.doi.org/10.2118/89039-pa.

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10

Do, Khanh Quang, Nam Nguyen Hai Le, Quang Trong Hoang, and Huy Xuan Nguyen. "Wellbore stability analysis based on the stress model around boreholes." Science and Technology Development Journal - Natural Sciences 1, T5 (2018): 290–301. http://dx.doi.org/10.32508/stdjns.v1it5.562.

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Wellbore stability analysis plays an important role in the oil and gas drilling. Instability problems during the drilling phase are often the results of a combination of both mechanical and chemical effects. This study aims to assess the mechanical wellbore stability based on the stress model around boreholes. The development of the stress model around boreholes, which is associated with the in-situ stresses, rock properties as well as the wellbore pressure and configuration, are presented. It could visualize the stress distribution around an arbitratily orientated wellbore. Next, lower hemisphere diagrams are presented to demonstrate the wellbore pressure required to initiate borehole tensile and compressive failures. A program for the risk analysis of wellbore (RAoWB) is designed and developed by the Matlab programming language to describe and analyse the risk diagrams of the drilling induced tensile fractures (DITFs) and breakouts (BOs). They help to choice the optimum wellbore trajectories for well planning, as well as to predict the wellbore instabilities caused by inappropriate wellbore pressures.
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