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Experimental method for evaluating damage of coal rock reservoir

An experimental method and technology of coal and rock, which can be used in material inspection products, soil material testing, etc., can solve problems such as failure to meet the requirements of coalbed methane damage evaluation, inability to truly and completely evaluate the degree of damage to various fluids, and achieve sustainable development. , the prospect of large-scale promotion and application, the effect of important social benefits

Active Publication Date: 2014-10-22
BC P INC CHINA NAT PETROLEUM CORP +1
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Problems solved by technology

[0004] However, due to the large difference between coalbed methane and conventional natural gas, ordinary damage assessment can no longer meet the requirements of coalbed methane damage assessment
[0005] At present, the domestic coal and rock reservoir damage evaluation still uses the conventional natural gas reservoir evaluation technology, and the conventional reservoir damage evaluation is mainly based on the oil and gas industry standard of the People's Republic of China (SYT5358-2010 Reservoir Fluid Sensitivity Experimental Evaluation Standard) for reservoir damage evaluation Experiment, that is, the damage evaluation is obtained by testing a single core, and this standard is mainly applicable to the permeability greater than 1×10-3μm 2 In conventional reservoirs, the permeability of coal reservoirs is generally lower than 1×10-3μm 2 , so the industry standard can no longer truly and completely evaluate the damage degree of various fluids; and the coal reservoir is different from the general sandstone. The coal reservoir has a double-pore structure, and there are cracks in the rock block. Evaluation of the impact of pores and fractures on gas production, the evaluation of the past industry standards can no longer reflect the damage of pores and fractures under various damage conditions

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  • Experimental method for evaluating damage of coal rock reservoir
  • Experimental method for evaluating damage of coal rock reservoir
  • Experimental method for evaluating damage of coal rock reservoir

Examples

Experimental program
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Effect test

Embodiment 1

[0045] An experimental method for damage evaluation of coal and rock reservoirs includes a core stress sensitive damage test and a working fluid damage test.

[0046] During the exploitation of oil and gas reservoirs, with the production of fluid inside the reservoir, the pore pressure of the reservoir decreases, and the original force balance state of the reservoir rock changes. According to the theory of rock mechanics, changing from one stress state to another stress state will inevitably cause the compression or stretching of the rock, that is, the rock will undergo elastic or plastic deformation. At the same time, the deformation of the rock will inevitably cause changes in the rock pores and pore volume, such The reduction of pore volume, the closure of pore throats and fractures, etc., will greatly affect the seepage of fluid in it. Therefore, the change of the seepage capacity of the reservoir caused by the change of the net stress suffered by the rock lock is the resu...

Embodiment 2

[0049] A new method of coal reservoir damage evaluation experiment, the schematic diagram of the experimental device is as follows figure 1 As shown, the stress-sensitive damage experiment of the present embodiment includes the following steps in turn:

[0050] Step 1) drill core, prepare coal rock matrix core and man-made fracture core according to SYT5358-2010 rock sample preparation method;

[0051] Step 2) measure the basic physical parameters of the coal rock matrix core and the artificial fracture core;

[0052] Step 3) Put the coal-rock matrix core into the first core holder, i.e. the natural column sample, put the artificial cracked core into the second core holder, i.e. the artificial seam sample, and combine the natural column samples with different permeability with the artificial sewing series;

[0053] Step 4) add confining pressure first, then add displacement pressure at the upstream end of the natural column sample to test the airtightness of the instrument; ...

Embodiment 3

[0071] A new method of coal reservoir damage evaluation experiment, the schematic diagram of the experimental device is as follows figure 1 As shown, the different stress damage experiments of the present embodiment include the following steps in turn:

[0072] Step 1) drill core, prepare coal rock matrix core and man-made fracture core according to SYT5358-2010 rock sample preparation method;

[0073] Step 2) measure the basic physical parameters of the coal rock matrix core and the artificial fracture core;

[0074] Step 3) Put the coal-rock matrix core into the first core holder, i.e. the natural column sample, put the artificial cracked core into the second core holder, i.e. the artificial seam sample, and combine the natural column samples with different permeability with the artificial sewing series;

[0075] Step 4) add confining pressure first, then add displacement pressure at the upstream end of the natural column sample to test the airtightness of the instrument; ...

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Abstract

The invention relates to the technical field of methods for evaluating damage of unconventional damage of a coal rock reservoir and discloses an experimental method for evaluating damage of a coal rock reservoir. The experimental method comprises the following steps: carrying out rock core stress sensitive damage experiment and working liquid damage experiment, serially connecting a coal rock matrix core with an artificial crack rock core so as to carry out damage evaluation. By virtue of the experimental method, the technical defect of incapability of carrying out damage evaluation on the coal rock pores and the cracks simultaneously with the adoption of a single rock core method in the conventional natural gas reservoir technology is overcome, so that the experimental result is relatively close to real coal reservoir characteristic; the experiment is safe and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of damage evaluation methods for unconventional oil and gas reservoirs, in particular to an experimental method for damage evaluation of coal rock reservoirs. Background technique [0002] my country is rich in coalbed methane resources, with a total volume of about 31.5 trillion cubic meters, making it the third largest country in the world with coalbed methane reserves. Proper development and utilization of coalbed methane can not only increase clean gas energy, but also help protect the atmospheric environment and improve coal mine safety production, which has unique social and economic benefits. [0003] Domestic coalbed methane has the four low problems of "low porosity, low permeability, low pressure, and low saturation", so the production of a single well is not high; and because coal reservoirs are extremely prone to damage, the production of a single well is too low or even no gas production Theref...

Claims

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Application Information

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IPC IPC(8): G01N33/24
Inventor 孙虎王祖文张冕池晓明陈飞康毅力杨燕袁冬蕊刘欢王新蒲王鸿章高红平
Owner BC P INC CHINA NAT PETROLEUM CORP
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