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Slim hole explosion crack generation assisted hydraulic fracturing method

A hydraulic fracturing and wellbore technology, which is applied in the direction of wellbore/well components, earthwork drilling, production fluid, etc., to achieve the effects of improving seepage capacity, avoiding explosion, and avoiding fracture bending

Active Publication Date: 2019-10-18
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to solve the problem of insufficient deep shale gas hydraulic fracturing technology in the prior art, the present invention provides a method for assisting hydraulic fracturing with explosive fracture creation in slim holes

Method used

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  • Slim hole explosion crack generation assisted hydraulic fracturing method
  • Slim hole explosion crack generation assisted hydraulic fracturing method
  • Slim hole explosion crack generation assisted hydraulic fracturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] A shale gas reservoir has a buried depth of 4000m and a reservoir thickness of 50m. In order to achieve the purpose of increasing shale gas production, the designed fracture length must be greater than 250m.

[0064] The horizontal wellbore length is 1200m. Combined with the logging data and relevant parameters of the detonator, the positions of 22m, 201m, 402m, 802m and 1002 in the horizontal section are selected as the slim hole positions.

[0065] Horizontal open holes were drilled and detonated at 21m, 201m, 402m, 802m, and 1002m in horizontal sections by means of horizontal sidetracking. For the convenience of expression, the horizontal sections 21m, 201m, 402m, 802m, and 1002m are referred to as the 1st, 2nd, 3rd, 4th, and 5th explosion points for short. Taking the fifth explosion point as an example, after running the skewer and completing the window repair work, the screw drilling tool and drill bit are used to complete the drilling of the radial and horizonta...

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Abstract

The invention discloses a slim hole explosion crack generation assisted hydraulic fracturing method. The method includes the following steps: firstly, windowing is carried out to side-drill a horizontal drilling well to form a long open slim hole, an explosive is put, and after the explosive explodes to impact rock, a large number of microcracks and micro-gaps are formed; secondly, perforation operation is carried out on the crack growing gaps formed by the impact of explosion pulse, slick-water is injected into perforation holes to form a main crack, the radial cracks and activated natural cracks are further opened to communicate with the main crack to form a complex crack network of main crack-branch crack, a glue solution or slick-water fracturing fluid mixed with a proppant is pumped for sanding to further extend and expand the main crack and the explosion cracks, the cracks are filled with the proppant, continuous sanding is carried out until designed sand volume is reached and then the operation is stopped. The method of the invention is simple in operation and mature in technology and can effectively improve the transformation efficiency of a deep shale gas reservoir.

Description

technical field [0001] The present invention relates to the technical field of hydraulic fracturing of deep shale gas, and furthermore, relates to a method for assisting hydraulic fracturing of small borehole explosive fracturing, which is a combination of high-pressure underground explosion and hydraulic fracturing for deep shale gas. Production technology. Background technique [0002] With the exploration, development and commercial exploitation of medium-deep shale in Fuling, Changning, Jiaoshiba, Weiyuan and other blocks, the current shale gas development is expanding from medium-shallow to deep. The deep development potential is huge. Taking Dajiaoshiba, Dingshan, Nanchuan and other regions as examples, the deep shale gas resources are as high as 4.612×10 8 m 3 . [0003] Although the development potential of deep shale gas is huge, its fracturing development is relatively difficult. This is mainly because as the depth increases, the closure pressure increases, the...

Claims

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Application Information

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IPC IPC(8): E21B43/263
CPCE21B43/263
Inventor 仲冠宇蒋廷学冯江鹏孔令军王海涛王钧
Owner CHINA PETROLEUM & CHEM CORP
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