Method for testing covering layer wettability and capillary pressure under stress loading condition
A technology of capillary pressure and stress loading, which is used in measurement devices, instruments, and analysis by nuclear magnetic resonance, etc., to achieve the effect of short test time and high accuracy
Pending Publication Date: 2022-03-25
CHONGQING UNIV
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[0005] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a method for testing cap rock wettability and capillary pressure under stress loading conditions to solve the problem of quickly testing cap rock wettability and capillary pressure under stress loading conditions. technical issues
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0031] The method for testing cap layer wettability and capillary pressure under stress loading conditions in this embodiment includes the following steps:
[0032] 1) Put the original rock sample obtained from the caprock into the core holder 1, and place the core holder on the detection platform of the nuclear magnetic resonance instrument 2. In this embodiment, the size of the test piece is selected as 25*50 mm, and of course the size of the test piece can also be adjusted as required.
[0033] 2) Connect the confining pressure loading system 3 to the confining pressure interface of the core holder, pressurize and heat the original rock sample in the core holder through the confining pressure loading system, so that the confining pressure and temperature of the original rock sample reach the set level. Value. In this embodiment, fluorine oil is use...
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The invention discloses a method for testing the wettability of a cap layer and the pressure of a capillary tube under a stress loading condition. The method comprises the following steps: 1) placing a core holder filled with an original rock sample on a nuclear magnetic resonance detection table; 2) applying confining pressure and temperature to the original rock sample to set values; 3) measuring the relaxation time T2 of the original rock sample through nuclear magnetic resonance; 4) measuring the volume V1 and relaxation time T2 of the disconnected pores of the dry rock sample; 5) measuring pore volumes V2 and T2 of the normal-pressure saturated water-absorbing rock sample; 6) measuring pore volumes V3 and T2 of the high-pressure saturated water-absorbing rock sample; 7) calculating the water wetting surface fraction Sw of the cover layer; and 8) calculating the capillary pressure Pc of the capping layer. According to the invention, the wetting characteristic and capillary force of the cover rock can be tested under different stress and temperature conditions, the test time consumption is short, the accuracy of the measurement result is high, and guidance can be provided for the evaluation of the sealing performance of the gas reservoir type gas storage cover and the optimization of engineering design parameters.
Description
technical field [0001] The invention relates to the technical field of gas storage in a gas reservoir type gas storage, in particular to a method for testing the wetting characteristics and capillary force of cap rock. Background technique [0002] As a clean and low-carbon energy source, natural gas plays an important role in the world's low-carbon energy transition. Many countries consider it the fuel of choice and plan to gradually increase their share of energy supply. It is predicted that by 2030, the global annual demand for natural gas will increase from 3.1 trillion cubic meters in 2010 to 5 trillion cubic meters, and the cross-regional trade volume will increase to about 1.3 trillion cubic meters, and the fastest growing region for natural gas demand is Asia. . With the growth of the world's demand for natural gas, pipeline transportation of natural gas cannot solve the contradictions in natural gas demand. For example, there are seasonal contradictions in demand,...
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Login to View More IPC IPC(8): G01N24/08
CPCG01N24/081Y02A90/30
Inventor 周军平孙军昌朱思南刘若涵郑少婧杨康田时锋董志强
Owner CHONGQING UNIV