The Wellbore Stability Study in Bedding Shale Formationon the Condition of Plasticity

Cao, Wenke; Liu, Wei

doi:10.1007/s10553-022-01370-y

Cited by 3 publications

(3 citation statements)

References 18 publications

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“…It is caused by the closure and expansion of micro-fractures under the action of loading pressure, which needs to overcome the shear strength of the shale body. The following three conclusions are drawn: (1) When the angle between the loading pressure direction and the bedding is 0 • ~30 • , the splitting failure mainly occurs along the bedding plane. (2) When the angle between the loading pressure direction and the bedding is 30 • ~75 • , the shear slip mainly occurs along the bedding plane.…”

Section: Triaxial Compressive Strength Testmentioning

confidence: 86%

“…Both the collapse pressure and the fracture pressure increase, and the drilling fluid density should be appropriately increased. The following three conclusions are drawn: (1) When the angle between the loading pressure direction and the bedding direction is 0°~30°, tensile failure mainly occurs along the bedding plane. (2) When the angle between the loading pressure direction and the bedding direction is 30°~60°, shear slip failure mainly occurs along the bedding plane.…”

Section: Tensile Strength Test Of Shalementioning

confidence: 89%

“…With the increasing importance of unconventional oil and gas resources in the global energy structure, shale oil has become a hot area of energy exploration and development [1][2][3]. The development of continental shale oil in China is still in its infancy.…”

Section: Introductionmentioning

confidence: 99%

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Study of Wellbore Instability and Collapse Mechanism for a Layered Continental Shale Oil Horizontal Well

Liang

Wang

et al. 2022

Energies

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The shale oil horizontal wells in the Songliao Basin are affected by a lack of mature theories, technologies and experiences in the direction of wellbore stability. Wellbore collapse may occur, and in severe cases, the wellbore may be scrapped, resulting in huge economic losses. Therefore, aiming at addressing the above problems, rock mechanics experiments were carried out. Based on the theories of elasticity and rock mechanics, this paper considers not only the influence of the bedding plane, but also the influence of hydration on the strength weakening of the shale body and the bedding plane. The analysis shows that no matter under which in situ stress mechanism, the wellbore in the vertical well section is the most stable, and when the inclination angle is approximately 45°, the wellbore is most likely to be unstable. Changes in water content do not affect the most stable or unstable regions. Under the same conditions, the equivalent density of collapse pressure increases with the increase in water content. In addition, field examples are also analyzed to verify the accuracy of this model, which can provide a theoretical and technical basis for the safe construction of continental shale oil horizontal wells.

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Section: Triaxial Compressive Strength Testmentioning

confidence: 86%

Section: Tensile Strength Test Of Shalementioning

confidence: 89%