Experimental on Mechanical Properties Characteristics of Oil Shale in Jiyang Depression

doi:10.3969/j.issn.1006-6535.2023.05.019

Abstract

Abstract: The exploration and development of shale oil in Jiyang Depression had achieved remarkable results, but the wall collapse of highly deviated horizontal wells was extremely prominent, which has repeatedly caused downhole jamming and even drilling accidents. In response to the problems above, the mechanical properties of oil shale and collapse damage law were studied through a series of indoor experiments on rock mechanics, and the mechanism and main control factors of oil shale horizontal wellbore destabilization were analyzed. The study shows that the oil shale rock fractures are extremely developed, mainly of the subparallel low-angle bedding fractures, accompanied by high-angle cross fractures, and the rock fragmentation is high; the mechanical parameters of oil shale have obvious anisotropy characteristics.When the maximum principal stress of the wellbore is perpendicular to the bedding fractures, the overall mechanical strength of the wellbore is the highest, and as the angle between the maximum principal stress and the bedding fractures decreases, the mechanical strength of the wellbore tends to decrease, and when the angle is about 60 °, the mechanical strength is the lowest, and the wellbore stability is the worst.The overall mechanical strength of the oil shale in Jiyang Depression is low, and the maximum compressive strength under downhole stress is 165 MPa, and the lowest is only 52 MPa; there is a difference in the damage mode of the oil shale rock, when the angle between the maximum principal stress and the bedding fracture surface in the wellbore is small, the main damage is the shear slip damage along the bedding fracture, otherwise, the main damage is the oil shale bedrock shear damage. The study results of the destabilization mechanism of oil shale wellbore in Jiyang Depression can provide support for the prediction of wellbore stability and the optimal design of engineering parameters for the highly deviated horizontal wells in oil shale.

Key words: Jiyang Depression, oil shale, mechanical strength anisotropy, drilling fluid immersion

CLC Number:

TE311

Wang Aimin, Wang Faming, He Wenqing, Wang Shuai, Liu Houbin. Experimental on Mechanical Properties Characteristics of Oil Shale in Jiyang Depression[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 144-150.

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