Method for improving permeability of shale base blocks rich in organic matters

A technology rich in organic matter and permeability, which is applied in the field of improving the permeability of organic-rich shale blocks and the rock permeability of shale gas layer blocks, and can solve problems that have not been involved and improve the permeability of shale blocks, and achieve Increased permeability, low economic cost and simple operation process

Active Publication Date: 2016-04-13
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

However, none of the existing methods or measures for improving the permeability of shale blocks involve oxidative decomposition of organic matter and pyrite to improve the permeability of shale blocks.

Method used

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  • Method for improving permeability of shale base blocks rich in organic matters
  • Method for improving permeability of shale base blocks rich in organic matters
  • Method for improving permeability of shale base blocks rich in organic matters

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Embodiment 1

[0031] In order to verify the reliability of the present invention, experiments were carried out using organic-rich shale, hydrochloric acid solution, and strong oxidizing solution to verify the dissolution or oxidative decomposition characteristics of shale carbonate minerals, organic matter, and pyrite, and analyzed the reaction Post-pore number, size and permeability parameters. The specific operation steps are as follows:

[0032] a. Select organic-rich shale according to the shale gas well logging and core analysis test data, and the organic matter content of the shale sample is required to be > 2% and the carbonate mineral content > 5%;

[0033] b. Injecting hydrochloric acid with a mass concentration of 5% to 15% into the shale block in step a to dissolve the carbonate mineral components inside the shale to form carbonate mineral dissolution pores;

[0034] c, after most of the carbonate mineral components are corroded in the step b, flow back the hydrochloric acid sol...

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Abstract

The invention provides a method for improving the permeability of shale base blocks rich in organic matters. An acid and an oxidizing solution are added in shale gas layer injection liquid. The liquid is injected in the shale base blocks rich in the organic matters, so that the shale organic matters and pyrites are oxidized and decomposed. Carbonate minerals are dissolved by the acid to form corrosion pores. Nanoscale pore reconstruction is realized, so that a seepage channel becomes large, the connectivity becomes good, and thus the permeability of the shale base blocks is improved. The method includes the steps of: selecting an oxidizing solution and the concentration according to the organic matter types and contents; respectively adding the oxidizing solution and hydrochloric acid into shale gas layer injection liquid; injecting the injection liquid into the shale base blocks rich in the organic matters; and flowing back the injection liquid after the injection liquid fully reacts with the shale. The method for improving the permeability of the shale base blocks rich in the organic matters can cooperate with the shale gas well hydrofracture reconstruction. The base block permeability is improved in a large range. The shale gas well output after the hydrofracture is raised. The operation technology is simple, and the economic cost is low.

Description

technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to a method for increasing the permeability of an organic-rich shale base block, which is mainly used for increasing the rock permeability of a shale gas layer base block. Background technique [0002] Shale gas is a typical unconventional natural gas with huge global resources and great exploitation value. However, the seepage channel of the shale matrix is ​​mainly in the nanometer scale, and the permeability of the matrix is ​​mainly between nadarcy and microdarcy, and the methane seepage resistance is huge. After drilling the shale gas layer, the gas well has no natural productivity, or the daily gas production is extremely high Low, it is necessary to take hydraulic fracturing stimulation measures to increase the daily production of gas wells. [0003] The principle of hydraulic fracturing stimulation is to "break up" shale, form an artificial frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/25
CPCE21B43/25
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
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