Static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs

A low-permeability oil and gas reservoir, static blasting technology, applied in the field of static blasting and fracturing, can solve the problems of limited fracturing effect, narrow application range of blasting fracturing technology, poor safety in use, etc. Simple construction and long working time

Active Publication Date: 2014-08-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention provides a static blasting and fracturing method for the exploitation of low-permeability oil and gas reservoirs such as shale gas in order to solve the problems of narrow application range, poor use safety, and limited fracturing effect of the existing blasting and fracturing technology

Method used

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  • Static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs
  • Static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs
  • Static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs

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Embodiment 1

[0026] A certain shale gas reservoir has a buried depth of 2,000 meters and a thickness of 20 meters. Such as figure 1 and image 3 1 is part of the horizontal well, 2 is the shale gas reservoir, 3 is the expansion hole, 4 is the blasting agent wrapped in the biodegradable film, 5 is the hydrolase solution, 6 is the fracture; 13 is the biodegradable film , 14 is blasting agent. Drill a horizontal well to the shale gas reservoir 2 along the direction of the minimum principal stress of the formation. After cementing, perforate the production layer at a rate of 20 holes / m to obtain the expansion hole 3. The diameter of the expansion hole can be 20-100 mm, and the hole depth can be 0.2~1.5m. Put the blasting agent 4 wrapped by the biodegradable film into the well, entrained by the hydrolase solution 5 into the expansion hole 3, the diameter of the wrapped blasting agent 5 is about 5 mm, and about 1.6 kg of the blasting agent 5 is filled in each hole, and the solution 6 is hydro...

Embodiment 2

[0028] Such as figure 2 As shown, a coalbed methane reservoir is buried 1500 meters deep and 30 meters thick. Such as figure 2 and image 3 As shown, 7 is a part of the well section of the vertical well, 8 is the coalbed methane reservoir, 9 is the expansion hole, 10 is the blasting agent wrapped by the biodegradable film, 11 is the hydrolytic enzyme solution, 12 is the fracture; 13 is the biodegradable film, 14 For blasting agent. Drill vertical wells to coalbed methane reservoir 8. After cementing, horizontally drill the production layer at 15 holes / m to obtain expansion holes. The diameter of the expansion holes can be 20-100 mm, and the hole depth can be 0.2-1.5 m. Put the blasting agent 10 wrapped in the biodegradable film into the well, entrained by the hydrolytic enzyme solution 11 into the expansion hole 9, the diameter of the blasting agent 10 wrapped in the biodegradable film is about 5 mm, and about 2 kg of the blasting agent 5 is filled in each hole, Hydrolas...

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Abstract

The invention discloses a static blasting fracturing method used for exploitation of shale gas and other low permeability oil and gas reservoirs. The method includes the steps that a producing well is drilled to an oil and gas reservoir, and after well cementation, perforation or drilling is conducted on a production horizon to obtain an expansion hole; a blasting agent wrapped by a biodegradable film is put into the well, and carried by a hydrolytic enzyme solution to the expansion hole; under the action of the hydrolytic enzyme, the biodegradable film is hydrolyzed and then releases the blasting agent, the size of the blasting agent expands continuously after the blasting agent reacts with water and generates expansion pressure to continuously fracture the reservoir, so that cracks are formed; the fracturing is repeated for one to two times, the cracks are expanded through expansion stress, new cracks are extended out, and the cracks become a communicated crack network. Environment-friendly type non-explosion dangerous goods are used as the blasting material, purchasing, transporting and storing are safe and reliable, and using is convenient; when the method is used for fracturing and transforming the oil and gas reservoir, the action time of one-time fracturing is long, the acting efficiency is high, a communicated crack network channel can be formed through repeated fracturing, and the method is good in fracturing effect, low in fracturing cost and wide in application range.

Description

technical field [0001] The invention relates to the field of oil and gas exploitation, in particular to a static blasting and fracturing method for exploitation of low-permeability oil and gas reservoirs such as shale gas. Background technique [0002] At present, shale gas and other low-permeability oil and gas have suddenly emerged in the field of global oil and gas resources, forming a new bright spot in exploration and development. Realizing the development and utilization of low-permeability oil and gas on a commercial scale is mainly to increase its gas production and recovery to reduce production costs, and the bottleneck lies in fracturing technology. The technical solutions disclosed in invention patents CN102168543B, CN102877823 A and CN103161434A all use the principle of blasting to transform oil and gas reservoirs to increase oil and gas recovery. Compared with hydraulic fracturing, the fracturing method is simple and efficient, and can greatly reduce The use of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/263
Inventor 樊栓狮孙超郎雪梅王燕鸿
Owner SOUTH CHINA UNIV OF TECH
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