改进的压力衰竭法测试页岩孔渗参数

doi:10.13809/j.cnki.cn32-1825/te.2020.01.008

Abstract

Abstract:

The permeability of unconventional reservoirs is low, such as shale gas, coal-bed methane and tight gas. It is difficult to measure the permeability by the conventional method. Therefore, a method using the improved pressure depletion to measure the porosity and permeability of tight rock is proposed. The principle is to use a smaller volume gas container with a high pressure applied to one end of the rock sample and then record the process of pressure depletion. According to the variation of pressure with time, calculate the permeability and porosity of core. Therefore, the test principle is analyzed and the computational model for porosity and permeability is established, the pressure depletion rule of the typical compact shale rock samples is tested, and the effects of different factors（gas composition, temperature, confining pressure and displacement pressure） on pressure depletion and permeability are studied. The permeability values of a shale sample under different test conditions are calculated according to the experimental results. Permeability calculation results show that the permeability decreases with the increase of temperature or confining pressure, which prove that the temperature and confining pressure have important effects on permeability measurement results. Compared with the field test results, it is found that the permeability test results are consistent with it, indicating that the experimental method is reliable.

Key words: tight rock, permeability, porosity, pressure depletion method, influencing factors

CLC Number:

TE122

Jianhua REN,Bi LU,Shaoran REN. Improved pressure depletion method measure the porosity and permeability of shale[J]. Reservoir Evaluation and Development, 2020, 10(1): 49-55.

Figures/Tables 10

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Table 1

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References 22

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测试气体	渗透率/10^-3μm²
	温度/℃（围压17.5 MPa）			围压/MPa（温度50 ℃）
	40	50	60	17.5	20.0	23.5
CH₄	4.26	2.73	1.63	2.73	1.45	0.93
N₂	2.11	1.24	0.61	1.24	0.73	0.49

Improved pressure depletion method measure the porosity and permeability of shale

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