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Method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture

A high-energy gas fracturing and pre-storage technology, which is applied in the direction of mining fluid, earthwork drilling, wellbore/well components, etc., to achieve the effect of low construction cost, tight connection and fast construction progress

Active Publication Date: 2015-10-14
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for preventing the closure of high-energy gas fracturing pre-existing fractures in view of the deficiencies in the above-mentioned prior art. The method has simple steps, reasonable design, convenient implementation, good use effect and can effectively solve Fracture closure problems in high energy gas fracturing

Method used

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  • Method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture
  • Method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture

Examples

Experimental program
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Embodiment 1

[0047] Such as figure 1 , figure 2 A method for preventing the closure of pre-existing fractures in high-energy gas fracturing includes the following steps:

[0048] Step 1. Perforating with a perforating gun: Perforating with a perforating gun lowered into the wellbore of an oil and gas well, and forming a plurality of perforation holes 8 in the target interval. Fractured oil and gas reservoirs.

[0049] In this embodiment, the plurality of perforation holes 8 are arranged horizontally.

[0050] Step 2. Artificial well bottom construction: construction of an artificial well bottom at the bottom of the wellbore of the oil and gas well, the artificial well bottom is located at the bottom of the casing 5 in the oil and gas well and below the target interval.

[0051] Step 3: lowering the tubing and injecting the blocking fluid: lower the tubing 6 to the position of the target layer described in step 1, and inject the blocking fluid 4 into the wellbore of the oil and gas well...

Embodiment 2

[0095] In this embodiment, the difference from Embodiment 1 is that: the hydrophobic spacer 3 described in step 401 and step 403 is formed by uniformly mixing carbon tetrachloride and diesel oil in a volume ratio of 45:100; Fracture propping fluid 2 is composed of the following raw materials in mass percentage: thickener: 0.72%; clay stabilizer: 0.45%; crosslinking agent: 0.25%; gel breaker: 0.60%; pH regulator: 0.33%; Agent: 27%; The balance is water; And, the mass percentage of the first gel breaker is 0.35%, and the mass percentage of the second gel breaker is 0.25%; The propellant that solid propellant grain 1 adopts in step five The agent is a bisaryl magnesium propellant.

[0096] In this embodiment, the construction methods and construction parameters of the remaining steps are the same as those in Embodiment 1.

Embodiment 3

[0098] In this example, the difference from Example 1 is that the fracturing support fluid 2 in step 402 is composed of the following raw materials in mass percentage: thickener: 0.64%; clay stabilizer: 0.33%; crosslinking agent: 0.25% %; gel breaker: 0.36%; pH regulator: 0.35%; fracturing proppant: 25.2%; the balance is water; the gel breaker is WBK-143L gel breaker or Breaker 3L gel breaker; step five The propellant used in the solid propellant grain 1 described above is a bisaryl-3 composite propellant.

[0099] In this embodiment, the construction methods and construction parameters of the remaining steps are the same as those in Embodiment 1.

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Abstract

The invention discloses a method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture. The method comprises following steps: 1, perforation by a perforating gun: adopting the perforating gun put lower into a well bore of an oil-gas well for perforation and forming multiple perforation tunnels in a target interval; 2, construction of an artificial bottom of the well: constructing the artificial bottom of the well at the bottom of the well bore of the oil-gas well; 3, downward placement of an oil pipe and injection of pressure baffle liquid: downwardly placing the oil pipe to the position where the target interval is located, injecting pressure baffle liquid into wellbores of the oil-gas well by means of the oil pipe till a sleeve pipe and the oil pipe are poured with pressure baffle liquid; 4, injection and displacement of fracturing propping liquid with the process as follows: primary injection of separation liquid, injection of fracturing propping liquid, secondary injection of separation liquid and displacement of fracturing propping liquid till the fracturing propping liquid is displaced to the target interval; 5, tripping of the oil pipe, hoisting and displacement of explosive columns; 6, initiation of explosion. The method capable of preventing pre-existing cracks against closure by adoption of high-energy gas fracture has following beneficial effects: the method has simple steps and a reasonable design and is conveniently realized and has fine usage effect; and a crack closure problem during the process of high-energy gas fracture is effectively solved.

Description

technical field [0001] The present invention relates to the technical field of oil and gas field formation fracturing reconstruction, and in particular relates to a method for preventing pre-existing fractures from high-energy gas fracturing from closing. Background technique [0002] At present, the commonly used fracturing methods include hydraulic fracturing, explosive fracturing and high-energy gas fracturing. Among them, high-energy gas fracturing is also called detonation fracturing, which uses the combustion of gunpowder or propellant to generate pulse loading and controls the pressure rise rate so that the rapidly released high-temperature and high-pressure gas will open multi-directional radial fractures near the wellbore to communicate with the reservoir. The natural fractures in the layer can be used to increase production. Nowadays, high-energy gas fracturing technology and its composite fracturing technology have been developed rapidly, and have been successful...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/263E21B43/267
Inventor 吴飞鹏刘静蒲春生任杨黄小梅赵青
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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