超深层砂岩储层岩石力学特性实验研究

doi:10.13722/j.cnki.jrme.2020.0670

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Abstract In order to study the mechanical properties of sandstone in ultra-deep reservoirs and their difference from those of sandstone in shallow reservoirs，research of deformation and failure mechanism of sandstone under ultra-deep in-situ conditions was conducted to obtain influence rules of the burial depth on the mechanical parameters of sandstone. Laboratory rock mechanical experiments including uniaxial compression，triaxial compression，Brazil and shear tests were conducted，and variation laws of uniaxial and triaxial compressive strengths，tensile strength，shear strength，internal friction angle，cohesion，elastic modulus，Poisson¢s ratio，brittleness index，fracture amount and failure modes with depth were systematically analyzed. Effects of formation temperature on sandstone strengths and mechanical behaviors were also studied. The results show that there are significant differences of mechanical strength，anti-deformation failure and failure mode between ultra-deep and shallow sandstones. Ultra-deep sandstones have higher strength and lower brittleness index and hence，are notably difficult in shear compression failure. Increasing of the confining pressure strengthen major rock mechanical parameters of sandstone. With increasing the temperature，the strength and the brittleness index decrease while the ductility rises. The confining pressure，temperature，physical properties and diagenesis are critical factors affecting the mechanical properties of ultra-deep sandstone.

Key words： rock mechanics ultra-deep sandstone rock mechanical properties triaxial compression tests brittleness index failure mode

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	LI Qinghui1
	LI Shaoxuan2

Cite this article:

LI Qinghui1,LI Shaoxuan2. Experimental study on mechanical properties of ultra-deep sandstone[J]. , 2021, 40(5): 948-957.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0670 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/948

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