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Static blasting and fracturing method for low-permeability shale gas reservoir exploitation

A low-permeability oil and gas reservoir, static blasting technology, applied in the field of oil and gas exploitation, can solve the problems of poor safety, limited fracturing effect, narrow application range of blasting and fracturing technology, etc., achieve long action time, ensure continuity and effective performance, easy construction

Active Publication Date: 2016-06-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 and fracturing method for low-permeability shale gas reservoir exploitation
  • Static blasting and fracturing method for low-permeability shale gas reservoir exploitation
  • Static blasting and fracturing method for low-permeability shale gas reservoir exploitation

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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 horizontal wells to the shale gas reservoir 2 along the direction of the minimum principal stress of the formation. After cementing, perforate the production layer at 20 holes / m to obtain expansion holes 3. The diameter of the expansion holes 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 blasting agent 5 is filled in each hole, and the solution 6 hydrolase The dosage is...

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 the 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 20-100mm, and the hole depth can be 0.2-1.5m. Put the blasting agent 10 wrapped in the biodegradable film into the well, entrained by the solution 11 of the hydrolytic enzyme 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, ...

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Abstract

The invention discloses a static blasting and fracturing method for the exploitation of shale gas low-permeability oil and gas reservoirs. The steps are: drilling a production well to an oil and gas reservoir, and perforating or drilling the production layer after cementing to obtain expansion holes; The blasting agent wrapped by the biodegradable film is put into the well, and is entrained by the hydrolytic enzyme solution into the expansion hole; the biodegradable film is hydrolyzed under the action of the hydrolytic enzyme to release the blasting agent, and the volume of the blasting agent expands continuously after reacting with water to generate swelling pressure and continuous pressure The fractured reservoir forms fractures; repeated fracturing 1~2 times, relying on the expansion stress to expand the fractures and extend new fractures, so that the fractures become a continuous fracture network. The blasting materials used in the present invention are environmentally friendly non-explosive dangerous goods, which are safe and reliable for purchase, transportation, and storage, and are convenient to use. When the present invention is used for fracturing reconstruction of oil and gas reservoirs, the time for one fracturing is long, the work efficiency is high, and repeated fracturing Fractures can form a continuous fracture network channel, the fracturing effect is good, the fracturing cost is low, and the application range is wide.

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 shale gas low-permeability oil and gas reservoirs. 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 the invention patents CN102168543B, CN102877823A 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 pressure The us...

Claims

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Application Information

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Patent Type & Authority Patents(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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