高温高压耦合下含不同倾角充填缝砂岩的强度实验研究

doi:10.13722/j.cnki.jrme.2017.1431

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Abstract The mechanical properties of rocks in ultra-deep reservoirs are very complicated，and well collapse and high pressure of fracturing construction are often encountered in the exploration of oil and gas. In order to reveal the failure damage modes and compressive strength characteristics of sandstone with different crack angles and different filling methods under the conditions of high temperature and high pressure，RTR–1500 triaxial rock testing system was used to carry out the compressive strength test experiment of sandstone cores with different crack angles and different filling methods. The influences law of different confining pressures，temperatures，crack angles and crack filling methods on rock strength were studied in the experiment. According to the experimental results，the diagram of failure criterion of sandstone cores with different crack angles is drawn under the coupling of high temperature and high pressure. The results show that：(1) the fracture dip is the most important factor affecting the failure mode and compressive strength. The failure mode of low and high angle fracture rock samples is shear failure，and the compressive strength does not change with the change of the fracture dip. The failure mode of oblique fracture rock samples is slip along the fracture surface，and the compressive strength decreases first and then increases with the increase of the fracture dip，there is a minimum. (2) The main types of micro-cracks in rock samples are different under different filling methods，which reflects the different properties of rock when it is destroyed. (3) Increasing temperature decreases the overall strength of rock samples，and increasing confining pressure increases the strength of rock samples. Coupling of high temperature and high pressure will make the rock body more fragmented. Rock samples change from brittleness to plasticity，increasing confining pressure will inhibit the effect of fracture dip.

Key words： rock mechanics ultra-deep layer high-temperature and high-pressure coupling filling method crack angle compressive strength failure criterion

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	Articles by authors
	LU Yunhu1
	2
	JIN Yan1
	2
	CHEN Mian1
	2
	ZHANG Jian1
	2
	WANG Haifeng3

Cite this article:

LU Yunhu1,2,JIN Yan1, et al. Experimental study on strength of sandstone with different fracture angles and different filling methods under high-temperature and high-pressure coupling[J]. , 2019, 38(S1): 2668-2679.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1431 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/IS1/2668

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