Matrix water sensitivity effect evaluation method
A technology for evaluating methods and effects, applied in measuring devices, analysis of suspensions and porous materials, scientific instruments, etc., can solve problems such as reservoir pollution, achieve effects of eliminating effects, good feasibility, and easy operation
Inactive Publication Date: 2019-02-26
北京大地高科地质勘查有限公司
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Problems solved by technology
Especially in the process of drilling, if water-based drilling fluid is used in highly water-sensitive formations, it will cause serious reservoir pollution
Method used
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Embodiment 1
[0020] A method for evaluating the water-sensitive effect of rock matrix, comprising the following steps:
[0021] (1) crush the rock sample into powder and dry it, and put it into the rock sample chamber;
[0022] (2) Close the rock sample chamber, and keep the rock sample powder confining pressure at 1 MPa by rotating the pressure rod and adjusting the confining pressure pump;
[0023] (3) Turn on the gas source, and after the differential pressure sensor shows a stable value, read the flow meter reading, and calculate the rock sample powder permeability at this time;
[0024] (4) Close the air source valve, open the water injection valve, inject deionized water into the rock sample powder, and start timing;
[0025] (5) Repeat step (3) every 0.5 hours to calculate the rock sample permeability value at each moment;
[0026] (6) Draw a curve of permeability versus time to analyze the influence of the water-sensitive effect of the rock sample matrix.
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The invention relates to a rock matrix water sensitivity effect evaluation method, which is characterized in that a rock sample is crushed to powder, the powder is dried, and is placed in a rock sample chamber; the rock sample chamber is closed, and the confining pressure of the rock sample powder is kept to 1 MPa by rotating a pressure bar and adjusting a confining pressure pump; a gas source isopened, after the differential pressure sensor reading is stable, the flow meter reading is read, and the permeability of the rock sample powder at this time can be calculated; a gas source valve is closed, a water injection valve is opened, deionized water is injected into the rock sample powder, and timing is carried out; then the permeability value of the rock sample at each time is calculatedevery 0.5 hours; finally, a curve of permeability changed with time is drafted, and then the influence of the water sensitivity effect of the rock sample matrix is analyzed. The rock matrix water sensitivity effect is evaluated by crushing the rock sample and evaluating the permeability of the rock sample while meeting water along with time.
Description
technical field [0001] The invention belongs to the research field of natural gas reservoirs, in particular to a method for evaluating matrix water-sensitive effects Background technique [0002] The water-sensitivity effect of rock is an important concern in the process of oil and gas field development. Especially in the process of drilling, if water-based drilling fluid is used in highly water-sensitive formations, it will cause serious reservoir pollution. In particular, some reservoirs have high clay content, especially montmorillonite and imonite mixed layers. After fracturing fluid enters such rocks, the volume of the matrix will expand, block the gas flow channel, and form water lock damage. [0003] In the conventional water-sensitivity evaluation process, due to the great difference in the pore structure of rocks, the degree of complexity and tortuousness are also different. In order to study the influence of rock mineral composition and clay content on the water-...
Claims
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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 黄勇禹建兵熊涛张才杨涛林中月
Owner 北京大地高科地质勘查有限公司