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A method to stimulate the desorption of shale adsorbed gas

A technology for adsorbing gas and shale, which is applied in the direction of earthwork drilling, production fluid, wellbore/well components, etc., can solve unrelated problems, achieve the effects of increasing production and recovery, simple operation, and improved desorption efficiency

Active Publication Date: 2018-08-24
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] None of the existing methods or measures used to stimulate the desorption of shale adsorbed gas involve oxidative decomposition of organic matter to stimulate CH 4 Desorption

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In order to verify the reliability of the present invention, experiments were carried out using organic-rich shale and oxidative solutions, the oxidative decomposition characteristics of shale organic matter were analyzed, and the changes in the surface area and diameter of organic matter pores before and after oxidative decomposition were characterized. The specific operation steps are as follows:

[0026] a. According to the shale gas well logging and core analysis test data, select the organic-rich shale gas layer with the adsorbed gas ratio greater than 30%;

[0027] b. Take the organic-rich shale of this layer as the experimental analysis sample, test the organic matter content of the sample based on the indoor high-temperature combustion method, and characterize the surface area and diameter of the shale nanopores based on the liquid nitrogen adsorption method;

[0028] c. Grinding the shale sample in step b to millimeter-scale particles, using a sufficient amount...

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PUM

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Abstract

The invention discloses a method for desorption excitation of adsorbed shale gas. The method includes: sequentially injecting hydrochloric acid and oxidizing agent solution into a shale gas reservoir containing the adsorbed gas after hydrofracture, wherein the hydrochloric acid is used for corrosion of carbonate mineral components of shale, and the oxidizing agent is used for oxygenolysis of organic matters. Acid corrosion of carbonate minerals aims to form micron-grade dissolved pores so as to improve infiltrability of a shale matrix and increase exposure area of the organic matters, and accordingly oxygenolysis of the oxidizing agent and the organic matters can be accelerated beneficially, and oxygenolysis range of the organic matters is expanded. The oxidizing agent is mainly used for oxygenolysis of the organic matters to reduce pores of the organic matters, increase pore diameter of the organic matters and reduce CH4 adsorption surface area, and accordingly desorption of adsorbed CH4 gas is promoted, and desorption excitation of the adsorbed shale gas is realized. The method has the advantages that by oxygenolysis of the organic matters under the chemical action, simplicity in operation and low economic cost are achieved, and desorption excitation of adsorbed shale gas in a large range is realized; by adoption of hydrofracture of the shale gas reservoir, recovery ratio and yield of a shale gas well can be further increased.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a method for stimulating the desorption of adsorbed gas in shale, which is mainly used for improving the desorption efficiency and recovery factor of adsorbed gas in shale gas layers. Background technique [0002] Shale gas refers to the natural gas stored in the organic-rich shale in the adsorption state, free state and dissolved state. The global shale gas resources are huge and have great exploitation value. The ratio of adsorbed gas to the total gas content in shale gas layers ranges from 20% to 80%, which is an important part of shale gas. Hydraulic fracturing is a necessary measure for the development of shale gas, and it is also the key to substantially increasing the production of shale gas wells. [0003] However, laboratory experiments and development practices have shown that when and only when the pore pressure of shale gas reservoirs is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/27
CPCE21B43/16E21B43/26
Inventor 游利军陈强康毅力杨鹏飞李相臣陈一健张晓怡许成元
Owner SOUTHWEST PETROLEUM UNIV