煤岩储气层岩石蠕变特性与本构模型研究

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Abstract Compared with normal coal，fracture development is the main physical characteristics of coal in coal bed gas reservoir，its structure is very complicated，and its easy to be damaged under geostress，always leads to the failure and instability of drilling during the exploitation process of coal bed gas. In order to explore the law of creep instability of borehole wall in coal bed gas reservoir，the writer adopted the American RTR–1000 triaxial rock mechanical test system to test the uniaxial creep law of coal in coal bed gas reservoir. Combined the Poyting-Thomson model with Bingham model，a creep model of coal is builted in coal bed gas reservoir and each parameter of creep equation through fitting is achieved. The creep model has been verified according to the uniaxial creep test results of coal in coal bed gas reservoir under different load conditions. The results show that the creep model of coal in coal bed gas reservoir can describe the deformation properties of each creep stage well，especially the decline stage and steady creep stage，and it can reflect the long-term strength of creep well. At the same time，combining the coal creep characteristics with the selection of drilling modes，an optimal selection idea of drilling liquid for coal bed gas reservoir has been put forward，which is significant and realistic meaning to maintain the stability of coal drilling，protect reservoir effectively and build drilling with high efficiency and safety.

Key words： rock mechanics coal bed gas reservoir creep property constitutive model

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	Articles by authors
	FAN Xiangyu1
	2
	ZHANG Qiangui2
	AI Wei3
	XIA Hongquan2
	HE Chuanliang4
	LI Zhilin5

Cite this article:

FAN Xiangyu1,2,ZHANG Qiangui2, et al. RESEARCH ON CREEP PROPERTY AND CONSTITUTIVE MODEL OF ROCK IN COAL BED GAS RESERVOIR[J]. , 2013, 32(s2): 3732-3739.

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/Is2/3732

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