Oxidation solution suitable for shale oxidation modification
A technology of oxidizing liquid and shale, which is applied in the direction of drilling composition, chemical instruments and methods, and production fluid, etc., which can solve the constraints of the ultimate gas recovery rate of shale gas reservoirs, the rapid decline rate of daily production of shale gas wells, Delay the rate of return on economic investment and other issues, to achieve the effect of expanding the scope of oxidation transformation, promoting self-absorption diffusion distribution, and improving desorption-diffusion capacity
Inactive Publication Date: 2019-02-22
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology
The production of shale gas undergoes a desorption-diffusion-seepage process, and it is difficult to produce methane gas far away from fractures quickly, resulting in a rapid decline in the daily production rat
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[0022] In order to have a clearer understanding of the technical features, purpose and beneficial effects of the present invention, an embodiment of the present invention will be further described in conjunction with the accompanying drawings.
[0023] In order to verify the reliability of the present invention, with distilled water as a reference, an oxidation solution-shale interaction experiment was carried out, and the changes in parameters such as organic matter, porosity, permeability, and fractures before and after shale treatment were tested. The specific operation steps are as follows:
[0024] (1) Select Longmaxi Formation organic-rich shale to test parameters such as organic matter type, content, permeability, and fractures;
[0025] (2) according to the organic matter type, content and mineral characteristics of the above-mentioned rock samples, determine the oxidant concentration in the oxidation solution;
[0026] (3) Inject the prepared oxidizing solution into ...
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The invention relates to an oxidation solution suitable for shale oxidation modification, and belongs to the technical field of oil and natural gas exploitation. Hydraulic fracturing economically exploits shale gas reservoirs, and the descend rate of the daily output of the a gas well after pressing is fast high and gas reservoir recovery efficiency is seriously reduced due to the fact that the shale gas production undergoes the process of desorption-diffusion-seepage and gas far from a crack is difficult to produce rapidly. It is considered that organic matter and pyrite in the shale are deposited in the reducing environment and easily oxidized and decomposed under oxygen-rich conditions to induce shale hole seamsrupture; and the oxidization solution is used in the fracturing process, theoxidization solution comprises components of a surfactant, a resistance reducing agent, an oxidant and an oxidation rate modifier, a shale-oxidizing solution effect is used for matrix modification, corrosion holes are induced, the gas transmission capacity in the shale matrix is strengthened, a useful supplement to an existing hydraulic pressure technology is formed, and the gas reservoir recovery efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of petroleum and natural gas exploitation, and relates to an oxidation liquid suitable for shale oxidation reconstruction. Background technique [0002] The multi-stage and staged fracturing technology of horizontal wells has been successfully applied to shale gas wells, realizing the economic development of shale gas reservoirs. The principle of hydraulic fracturing stimulation is to "break up" shale, form an artificial fracture network inside the gas layer, shorten the distance of methane gas flowing to the fractures in the matrix, increase the overall permeability of the gas layer, and greatly increase the daily production of gas wells after fracturing. [0003] Purely mechanical hydraulic fracturing is aimed at producing as many and complex fractures as possible, and has no significant effect on the transformation of shale matrix gas transmission channels. The production of shale gas undergoes desorptio...
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Login to View More IPC IPC(8): C09K8/68E21B43/26
CPCC09K8/68E21B43/26
Inventor 游利军程秋洋康毅力陈强李相臣豆联栋周洋徐洁明许成元
Owner SOUTHWEST PETROLEUM UNIV