A method to prevent the closure of pre-existing fractures in high-energy gas fracturing

A high-energy gas fracturing and pre-storage technology, which is applied in the development of fluids, earth-moving drilling, wellbore/well components, etc., to achieve the effect of convenient realization, fast construction progress and tight connection

Active Publication Date: 2017-11-14
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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  • A method to prevent the closure of pre-existing fractures in high-energy gas fracturing
  • A method to prevent the closure of pre-existing fractures in high-energy gas fracturing

Examples

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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 the closure of pre-existing fractures in high-energy gas fracturing, including the steps: 1. Perforating with a perforating gun: using a perforating gun that is lowered into the wellbore of an oil and gas well to perforate in the target interval Multiple perforation holes are formed; 2. Artificial bottom hole construction: construction of artificial well bottom at the bottom of the wellbore of oil and gas wells; Inject the barrier fluid into the wellbore of the oil and gas well until the casing and tubing are filled with the barrier fluid; 4. The injection and displacement of the fracturing propping fluid, the process is as follows: the initial injection of spacer fluid, the injection of fracturing propping fluid, the spacer fluid Secondary injection and replacement of fracturing propping fluid until the fracturing propping fluid is replaced to the target zone; 5. Hoisting and lowering of the tubing and explosive column; 6. Detonation. The method of the invention has simple steps, reasonable design, convenient implementation and good application effect, and can effectively solve the crack closure problem existing in the high-energy gas fracturing process.

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 Patents(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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