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A shale gas production stimulation method based on the combination of explosive fracturing and hydraulic fracturing

A technology of explosion fracturing and hydraulic fracturing, which is used in earth-moving drilling, wellbore/well components, measurement, etc., and can solve the problems of scrapped wellbore, vulnerable wellbore, and high explosion power.

Active Publication Date: 2022-05-17
CHINA UNIV OF MINING & TECH
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  • Claims
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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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  • A shale gas production stimulation method based on the combination of explosive fracturing and hydraulic fracturing
  • A shale gas production stimulation method based on the combination of explosive 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 method for promoting production of shale gas based on the combination of explosive fracturing and hydraulic fracturing. First, a horizontal well for explosive fracturing is drilled, and then a perforation fracture is formed in the horizontal well for explosive fracturing and installed. The first detonation sealing device forms a sealing section. If the required value for explosion is reached in the sealing section within the set time, the detonation gas will be triggered to perform impact fracturing on the perforation fracture; if the required value for explosion is not reached, value, supplement the detonation gas in the sealing section, then complete detonation fracturing once, and then repeat the above process to form detonation fracturing fracture network around the detonation fracturing horizontal well and seal Finally, a hydraulic fracturing horizontal well is drilled under the explosion fracturing horizontal well, and the method of retreating hydraulic fracturing is adopted to form a hydraulic fracturing fracture area around the hydraulic fracturing horizontal well, and the fracture area can be in contact with the combustion chamber. The shale gas is extracted from the shale reservoir through hydraulic fracturing horizontal wells.

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 Patents(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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