CO2 refracturing process technology for low-permeability gas well

A technology of repeated fracturing and process technology, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc., and can solve problems such as incompleteness and poor effect

Active Publication Date: 2012-12-12
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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  • Abstract
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Problems solved by technology

Research on refracturing began in China in 1990. Daqing, Shengli, Changqing, Dagang, Jilin and other oil fields have carried out a large number of refracturing operations, and some explorations have been made in

Method used

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  • CO2 refracturing process technology for low-permeability gas well
  • CO2 refracturing process technology for low-permeability gas well
  • CO2 refracturing process technology for low-permeability gas well

Examples

Experimental program
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Embodiment Construction

[0022] Take the refracturing of the 2nd member of XXX Jingshan as an example.

[0023] Low permeability gas well CO 2 Refracturing technology, which is a second fracturing operation for wells that have been put into production. It includes two parts: pre-fracturing analysis and optimization and fracturing construction. Pre-fracturing analysis and optimization includes fracturing failure analysis and fracturing material selection. and optimization of construction parameters.

[0024] Low permeability gas well CO 2 Refracturing technology is implemented in the following steps:

[0025] Step 1. Perform a fracturing failure analysis on the well to be constructed to determine whether there is a possibility of refracturing. The analysis results show that the 2nd section of XXX Jingshan can be refractured.

[0026] Step 2, selection of fracturing materials, is divided into selection of fracturing fluid and proppant.

[0027] (1) Selection of fracturing fluid:

[0028] CO 2 The ...

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Abstract

The invention belongs to the technical field of oil exploitation, and relates to a refracturing modification process for a low-permeability and low-yield gas well, in particular to a CO2 refracturing process technology for a low-permeability gas well. The CO2 refracturing process technology is used for performing secondary fracturing construction for an implemented well, comprises analysis and optimization before fracturing and fracturing construction, and is characterized in that the analysis and optimization before fracturing comprises fracturing failure analysis, fracturing material optimization and construction parameter optimization, and the specific process technology is implemented according to steps of fracturing failure analysis, fracturing material optimization, construction parameter optimization and refracturing construction. According to the CO2 refracturing process technology for the low-permeability gas well, a CO2 foam fracturing technology and low-damage cleaning fracturing liquid are used for performing a modification test for a low-yield gas well by analyzing a reservoir, the flowback rate of the fracturing liquid and the yield of the low-yield gas well are increased effectively, and damage to the reservoir is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of oil exploitation, and is a low-permeability and low-yield gas well repeated fracturing reconstruction process, especially a low-permeability gas well CO 2 Repeated fracturing technology. Background technique [0002] After a period of fracturing and completion of gas wells in low-permeability gas reservoirs, the fracture conductivity gradually decreases, and fracturing often needs to be performed again. Overseas began research on refracturing as early as 1960, and now a series of core technologies have been formed and significant economic benefits have been achieved. Research on refracturing began in China in 1990. Daqing, Shengli, Changqing, Dagang, Jilin and other oil fields have carried out a large number of refracturing operations, and some explorations have been made in theory and practice, but mainly for oil wells. However, the relevant research on low-permeability gas well refracturing technology...

Claims

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Application Information

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IPC IPC(8): E21B43/267
Inventor 池晓明杨燕张冕刘欢郭艳萍宋孝丹袁冬蕊高红平徐俊芳李杉杉
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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