Carbon dioxide thickening fracturing system and technological method thereof

A technology of carbon dioxide and liquid carbon dioxide, which is applied in chemical instruments and methods, earthwork drilling, mining fluids, etc., can solve the problems that liquid carbon dioxide cannot create fractures, and achieve the effects of increasing single well production, increasing flowback rate, and reducing impact

Pending Publication Date: 2021-12-03
YANAN SHUANG FENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a carbon dioxide thickening fracturing system and its process method, aiming to solve the problem that conventional liquid carbon dioxide cannot normally create fractures in the reservoir

Method used

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  • Carbon dioxide thickening fracturing system and technological method thereof

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Effect test

Embodiment 1

[0031] Embodiment 1, a carbon dioxide thickening fracturing process, comprising the following steps:

[0032] 1) Telescoping shorts 21, safety joints 23, low-temperature, high-pressure gas-sealed hydraulic anchors 24, low-temperature, high-pressure gas-sealed anchor packers 25, sandblasting nozzles 26 and fracturing completion tubing 22 are lowered into the well through workover machinery, The low-temperature, high-pressure air-tight anchored packer 25 is set and started by rotating the fracturing completion tubing 22, and the anchoring machine contacts and anchors with the inner wall of the production casing 20;

[0033] The seal is attached to the inner wall of the 20 production casing to play a sealing role. The low-temperature and high-pressure gas-sealed hydraulic anchor will enter the high-pressure fracturing fluid and liquid CO2 into the tubing 24. 2 start at the same time, contact and anchor with the inner wall of the production casing 20, when the cryogenic liquid CO ...

Embodiment 2

[0041] Embodiment 2, a carbon dioxide thickening fracturing process, comprising the following steps:

[0042] 1) Telescoping shorts 21, safety joints 23, low-temperature, high-pressure gas-sealed hydraulic anchors 24, low-temperature, high-pressure gas-sealed anchor packers 25, sandblasting nozzles 26 and fracturing completion tubing 22 are lowered into the well through workover machinery, The low-temperature, high-pressure air-tight anchored packer 25 is set and started by rotating the fracturing completion tubing 22, and the anchoring machine contacts and anchors with the inner wall of the production casing 20;

[0043] The seal is attached to the inner wall of the 20 production casing to play a sealing role. The low-temperature and high-pressure gas-sealed hydraulic anchor will enter the high-pressure fracturing fluid and liquid CO2 into the tubing 24. 2 start at the same time, contact and anchor with the inner wall of the production casing 20, when the cryogenic liquid CO ...

Embodiment 3

[0051] Embodiment 3, a carbon dioxide thickening fracturing process, comprising the following steps:

[0052] 1) Telescoping shorts 21, safety joints 23, low-temperature, high-pressure gas-sealed hydraulic anchors 24, low-temperature, high-pressure gas-sealed anchor packers 25, sandblasting nozzles 26 and fracturing completion tubing 22 are lowered into the well through workover machinery, The low-temperature, high-pressure air-tight anchored packer 25 is set and started by rotating the fracturing completion tubing 22, and the anchoring machine contacts and anchors with the inner wall of the production casing 20;

[0053] The seal is attached to the inner wall of the 20 production casing to play a sealing role. The low-temperature and high-pressure gas-sealed hydraulic anchor will enter the high-pressure fracturing fluid and liquid CO2 into the tubing 24. 2 start at the same time, contact and anchor with the inner wall of the production casing 20, when the cryogenic liquid CO ...

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Abstract

The invention provides a carbon dioxide thickening fracturing system, which is suitable for the field of fracturing transformation. The carbon dioxide thickening fracturing system comprises an output system, a fracturing fluid treatment system and a liquid CO2 treatment system, wherein the fracturing fluid treatment system comprises a liquid CO2 thickening agent stock solution treatment system and a fracturing fluid thickening system. A technological method comprises the following step that an extension short joint 21, a safety joint 23, a low-temperature high-pressure air-tight sealing hydraulic anchor 24, a low-temperature high-pressure air-tight sealing anchoring type packer 25, a sand blasting nozzle 26 and a fracturing well completion oil pipe 22 are put into a well together through a well repairing machine. According to the carbon dioxide thickening fracturing system, thickening of liquid carbon dioxide, fracture forming of the thickened liquid carbon dioxide, sand carrying of the thickened liquid carbon dioxide and liquid together and the like are achieved by designing fracturing fluid and liquid carbon dioxide pumping programs, the influence of liquid on a reservoir can be effectively reduced, the flowback rate is increased, the reservoir transformation effect is guaranteed to the maximum extent, and the single well yield is increased.

Description

technical field [0001] The invention belongs to the field of fracturing reconstruction, and in particular relates to a carbon dioxide thickening fracturing system and a process method thereof. Background technique [0002] Fracturing technology is the most direct and effective method to enhance oil recovery and increase single well production. The oil and gas industry has also carried out a large number of field tests and applications over the years, and developed a variety of technological methods to improve the effect of fracturing. CO 2 The fracturing process is based on the traditional fracturing process, replacing the water-based fracturing fluid with liquid CO 2 A modified process, mainly through liquid CO 2 To create fractures and carry sand to achieve the purpose of reservoir transformation. [0003] Chinese patent CN110761764A discloses a liquid carbon dioxide fracturing method, which is aimed at dry CO 2 The optimal design of the fracturing process does not ad...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/267E21B43/12C09K8/66
CPCE21B43/26E21B43/2605E21B43/2607E21B43/267E21B43/122C09K8/665
Inventor 袁彦峰李秋昕李明逯瑞晓王甜郑焰
Owner YANAN SHUANG FENG GRP
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