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Methods for Restoring Gas Content in Shale

A technology of shale gas content and gas content, which is applied to the analysis of materials and instruments, can solve the problems of inaccurate recovery of shale gas content and excessive deviation of theoretical basis, and achieve the effect of evaluating exploitability and perfecting theoretical basis

Inactive Publication Date: 2017-11-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] The invention provides a method for restoring the gas content of shale, which overcomes the defect in the prior art that the theoretical basis of gas content restoration in shale is too large and causes inaccurate restoration of gas content in shale

Method used

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  • Methods for Restoring Gas Content in Shale
  • Methods for Restoring Gas Content in Shale
  • Methods for Restoring Gas Content in Shale

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Embodiment

[0047] In this embodiment, the shale gas content measurement is carried out for the shale in southeast Chongqing, including the following steps:

[0048] 1) First analysis: from the pressure P 0 =7100751.744Pa, temperature T 1 =30°C shale is taken from the formation, the shale is placed in the analysis box for the first analysis, and the pressure P of the analysis box is set 1＝ 99665Pa (atmospheric pressure), temperature T 1 = 30°C, until no gas is produced, collect the first analytical gas;

[0049] 2) The second analysis: set the temperature T of the analysis box 2 = 95°C, pressure P 1 =99665Pa, carry out the second analysis on the shale after the first analysis until no gas is produced, and collect the second analysis gas 31mL (the ambient pressure of the collected gas P 3 =99665Pa, T 3 =12°C), the volume of the second analytical gas under standard conditions is 29.2089cm through formula 7 3 ,

[0050] Formula 7

[0051] Among them, V 计算 =31cm 3 , P 计算 =99665...

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Abstract

The present invention provides a method for recovering the gas content of shale. The method restores the original gas content of mud shale through adsorption gas content and pore volume gas content, wherein the recovery of the adsorption gas content is based on Polanyi adsorption potential and London dispersion effect Potential energy theory and gas state equation are the theoretical basis, combined with the core column methane adsorption isotherm curve, gas component test data, shale porosity and water saturation, through the gas adsorption gas content between the formation temperature and 95 °C analysis process The change is obtained; the recovery of the pore volume and gas content is obtained through the state equation using the test data of porosity and water saturation. The theoretical basis of the gas content recovery method is more perfect, and it can restore the original content of each gas component in shale, which is conducive to more accurate, objective and comprehensive evaluation of the recoverability of shale gas reservoirs.

Description

technical field [0001] The invention relates to unconventional oil and gas exploration and development technology, in particular to a method for restoring shale gas content. Background technique [0002] Shale gas is a popular unconventional oil and gas resource today, so the development of shale is crucial to the acquisition of shale gas resources. Before shale development, in order to avoid the economic loss of exploration and development or the loss of recoverable resources, it is usually necessary to evaluate shale, and the gas content of shale is an important reference index for evaluating shale gas resource potential and predicting favorable areas. Therefore, the accurate total gas content of shale can provide a reliable basis for resource potential evaluation and favorable area prediction. [0003] At present, the total gas content of shale gas is obtained by adding the lost gas volume and the analytical gas volume, and the estimation method of shale gas loss mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N7/14
Inventor 黄何鑫姜振学李卓杨潇原园陈磊冯洁
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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