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Shale gas production promoting method based on combination of blasting fracturing and hydraulic fracturing

A technology of explosive fracturing and hydraulic fracturing, which is applied in earthwork drilling, fluid extraction, measurement, etc. It can solve problems such as wellbores are vulnerable to damage, wellbores are scrapped, and the shale gas extraction process cannot be realized.

Active Publication Date: 2021-09-03
CHINA UNIV OF MINING & TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the powerful explosion, the wellbore is easily damaged, resulting in the scrapping of the wellbore, and ultimately the subsequent shale gas extraction process cannot be realized

Method used

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  • Shale gas production promoting method based on combination of blasting fracturing and hydraulic fracturing
  • Shale gas production promoting method based on combination of blasting fracturing and hydraulic fracturing

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Embodiment 1

[0024]Embodiment 1: through geological exploration, it is found that there is a shale reservoir 1 with mining value in the stratum of a certain area, and the thickness of this shale reservoir 1 is about 200m, such as figure 1 Shown, adopt the method of the present invention to carry out shale gas exploitation, concrete steps are:

[0025] A. Drill a shaft from the ground to the shale reservoir 1 to be extracted until the shaft 2 reaches a depth of 20m in the shale reservoir 1 and stop, and install the casing 4 to the shaft during the drilling of the shaft 2 2, complete the setting work of shaft 2;

[0026] B. Use a directional drilling rig to extend into the vertical shaft 2 and reach the location of the shale reservoir 1, drill an explosion fracturing horizontal well 3-2 from the vertical shaft 2 to the shale reservoir 1, and perform explosion fracturing in the shaft 2 The horizontal well 3-2 is supported by a combination of casing 4 and screen 5, wherein one end of the casi...

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Abstract

The invention discloses a shale gas production promoting method based on combination of blasting fracturing and hydraulic fracturing. The method comprises the following steps that firstly, a blasting fracturing horizontal well is punched, then a perforation fracture is formed in the blasting fracturing horizontal well, a first blasting hole packer is installed, a hole sealing section is formed, and if the value required by explosion is reached in the hole sealing section within a set time, blasting gas is triggered to conduct primary impact fracturing on the perforation fracture; if the value required by explosion is not reached, blasting gas is supplemented into the hole sealing section, then one-time blasting fracturing is completed, next, the above process is repeated, a blasting fracturing fracture network is formed around the blasting fracturing horizontal well through retreating blasting fracturing, and hole sealing is conducted; and finally, a hydraulic fracturing horizontal well is punched below the blasting fracturing horizontal well, a hydraulic fracturing fracture area is formed around the hydraulic fracturing horizontal well by adopting a retreating hydraulic fracturing method, wherein the fracture area can be in communication with the blasting fracturing fracture network, and at the moment, shale gas extraction work is conducted on a shale reservoir through the hydraulic fracturing horizontal well.

Description

technical field [0001] The invention relates to a method for promoting production of shale gas based on the combination of explosive fracturing and hydraulic fracturing, and belongs to the technical field of shale gas exploitation. Background technique [0002] The global shale gas reserves are abundant, and it is the most promising unconventional energy. Hydraulic pressure is currently the most mature and widely used shale reservoir permeability enhancement method, but limited by the technology itself, the production of shale gas wells can drop by 45% to 55% within 5 to 6 months after fracturing. The reason for the decline in output: on the one hand, because hydraulic fracturing takes a long time and is affected by the stress environment, it is difficult to form a complex fracture network with a single fracture expansion, and the permeability enhancement effect is limited; on the other hand, it is difficult for proppant to enter micro-fractures, making Fracture fractures a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/263E21B43/26E21B47/06E21B47/00E21B41/00E21B33/13
CPCE21B43/263E21B43/26E21B47/06E21B47/00E21B41/00E21B33/13
Inventor 翟成唐伟余旭徐吉钊刘厅孙勇丛钰洲郑仰峰李宇杰朱薪宇魏则宁王宇黄婷
Owner CHINA UNIV OF MINING & TECH
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