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Representation method for gas holding capability of shale in shale gas preservation condition evaluation

A technology for preservation conditions and shale gas, which is applied to the analysis of materials and instruments, can solve the problems of inoperable characterization methods and cannot meet the needs of evaluation of shale gas preservation conditions, and achieve the effect of intuitive description and analysis

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, there is no operable characterization method for this gas-fixation effect of shale, which cannot meet the needs of evaluation of shale gas preservation conditions.

Method used

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  • Representation method for gas holding capability of shale in shale gas preservation condition evaluation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The No. 1 shale sample from Well X in southeastern Sichuan was selected for isothermal adsorption test. The real methane adsorption capacity of the shale at a pressure of 11.01 MPa and a temperature of 60°C is 58.48 mol / t.

[0033] Using the formula ρ ab = ρ b / exp[0.0025(T-T b )] Calculate the adsorption phase density of methane to be 0.2436g / cm 3 ;

[0034] Use the formula ω=V*M / ρ ab The calculated adsorption space of the shale sample is 0.0038cm 3 / g;

[0035] Use the formula D=V 孔 / G calculates the pore volume of the shale sample to be 0.0047cm 3 / g;

[0036] Using the formula B=ω / D to calculate the solid-gas index of the shale sample is 0.81.

Embodiment 2

[0038] The No. 2 shale sample from Well X in southeastern Sichuan was selected for isothermal adsorption test. The true methane adsorption capacity of the shale at a pressure of 10.1 MPa and a temperature of 60°C is 105.80 mol / t.

[0039] Using the formula ρ ab = ρ b / exp[0.0025(T-T b )] Calculate the adsorption phase density of methane to be 0.2436g / cm 3 ;

[0040] Use the formula ω=V*M / ρ ab The calculated adsorption space of the shale sample is 0.0069cm 3 / g;

[0041] Use the formula D=V 孔 / G calculates the pore volume of the shale sample to be 0.0088cm 3 / g;

[0042] Using the formula B=ω / D to calculate the solid-gas index of the shale sample is 0.78.

Embodiment 3

[0044] Shale samples from Well Y in southeastern Sichuan were selected for isothermal adsorption experiments. The real methane adsorption capacity of the shale at a pressure of 10.1 MPa and a temperature of 30°C is 113.86 mol / t.

[0045] Using the formula ρ ab = ρ b / exp[0.0025(T-T b )] Calculate the adsorption phase density of methane to be 0.2626g / cm 3 ;

[0046] Use the formula ω=V*M / ρ ab The calculated adsorption space of the shale sample is 0.0069cm 3 / g;

[0047] Use the formula D=V 孔 / G calculates the pore volume of the shale sample to be 0.0108cm 3 / g;

[0048] Using the formula B=ω / D, the solid-gas index of the shale sample is calculated to be 0.64.

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Abstract

The invention relates to a shale gas preservation condition evaluation technology in the petroleum geology field, in particular to a representation method for the gas holding capability of shale in shale gas preservation condition evaluation. The method includes the steps that 1, a shale sample is selected, an isothermal adsorption experiment is conducted, and the real natural gas adsorption quantity under experimental temperature and pressure conditions is obtained; 2, the adsorption quantity of the sample under the experimental temperature and pressure conditions is calculated with isothermal adsorption data in the step 1, and adsorption space occupied by adsorbed gas is calculated; 3, the pore volume and mass of the shale sample are measured, and the specific pore volume of the sample is calculated; 4, the gas holding index of the shale sample is calculated; 5, the gas holding effect of the shale sample is evaluated.

Description

technical field [0001] The invention belongs to the field of oil and gas geology. A characterization method for shale gas-solid capacity in the evaluation of shale gas preservation conditions is provided. Background technique [0002] The preservation condition of shale gas is one of the indispensable contents in the evaluation research of shale gas. In the research work on the evaluation of shale gas preservation conditions, on the one hand, we refer to and apply conventional oil and gas preservation condition evaluation methods, and focus on the research on the sealing capacity of the roof and floor of shale gas-bearing intervals, and on the side effects of shale gas-bearing intervals. The evaluation of plugging conditions in the direction is carried out from the aspects of structural conditions, hydrogeological conditions, natural gas composition and isotope analysis and test data, as well as the thickness, brittleness, lithology, and microscopic pore structure of the ro...

Claims

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Application Information

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IPC IPC(8): G01N7/04
Inventor 鲍云杰翟常博邓模黄泽光李志明曹婷婷王勤
Owner CHINA PETROLEUM & CHEM CORP
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