Method for fracturing multiple horizontal bedding fissures of shale gas

A technology of horizontal bedding and shale formations, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., and can solve problems such as insufficient attention to expansion

Inactive Publication Date: 2017-03-29
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology

[0005] Most of the current volume fractures or network fractures pay attention to the vertical extension of main fractures and branch fractures, while the extension of bedding fractures and / or texture fractures in the horizontal direction is not paid enough attention, and no measures are taken to extend more horizontal fractures. Bedding seams and / or texture seams

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  • Method for fracturing multiple horizontal bedding fissures of shale gas

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[0026] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the process of how to apply technical means to solve technical problems and achieve technical effects in the present invention. It should be noted that, as long as there is no conflict, each embodiment and each feature in each embodiment of the present invention can be combined with each other, and the formed technical solutions are all within the protection scope of the present invention.

[0027] At present, most of the volume fractures or network fractures focus on the vertical expansion of main fractures and branch fractures, while the expansion of bedding and / or texture fractures in the horizontal direction is not paid enough attention, and no measures are taken to extend more horizontal fractures. Bedding seams and / or texture seams. Therefore, the above-mentioned volume fractures or networ...

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Abstract

The invention discloses a method for fracturing multiple horizontal bedding fissures of shale gas. The method includes the steps of carrying out acid pretreatment on a target shale bed to lower the fracturing pressure of shale beds; carrying out first-stage fracturing treatment on the target shale bed subjected to the acid pretreatment to lower the extension speed of fractures of the shale beds; carrying out second-stage fracturing treatment on the target shale bed subjected to the first-stage fracturing treatment to increase the length of the fractures of the shale beds; and carrying out propping agent filling and supporting on the target shale bed subjected to the second-stage fracturing treatment to maintain complex fractures formed by fracturing. According to the method, the control degree of the fractures of the shale beds can be improved, the modified size can be increased, and the post-fracturing effect can be improved.

Description

technical field [0001] The invention relates to the technical field of shale gas horizontal well fracturing, in particular to a method for fracturing multiple horizontal bedding fractures of shale gas. Background technique [0002] In shale gas fracturing design and construction, realizing network fractures or volume fractures is the ultimate pursuit goal. At present, domestic and foreign methods to increase the volume of fracture stimulation include multi-cluster perforation, wide-band fracturing (solid temporary plugging agent and fiber mixed to seal wellbore blasthole and well-entry fracture zone), large-scale fracturing, single and multiple diversions in fractures Fracturing (using the net pressure of artificial fractures to open natural fractures or temporary plugging agents in fractures, etc.). However, the main problems in the existing methods for increasing the volume of fracture stimulation include the following aspects. [0003] First, the height of shale fractur...

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Application Information

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IPC IPC(8): E21B43/26
Inventor 蒋廷学李双明卞晓冰刘红磊王海涛
Owner CHINA PETROLEUM & CHEM CORP
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