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a co 2 -The method and application of alternate injection of water for purging gas

A technology of alternating injection and CO2, applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve the problems of rising processing costs and lowering displacement efficiency, and achieve lower surface gathering and transportation costs and lower corrosion inhibitor doses. , the effect of effective preservation

Active Publication Date: 2020-03-20
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the injection of CO into the gas reservoir 2 The two main problems are to increase the pressure and prevent gas channeling
Especially once the production wells CO 2 Gas channeling, on the one hand, the displacement efficiency will be greatly reduced, on the other hand, the CO 2 Processing costs will increase significantly

Method used

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  • a co <sub>2</sub> -The method and application of alternate injection of water for purging gas
  • a co <sub>2</sub> -The method and application of alternate injection of water for purging gas
  • a co <sub>2</sub> -The method and application of alternate injection of water for purging gas

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Experimental program
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Embodiment

[0038] Select the DND gas field, apply numerical simulation on the computer for CO 2 - Water is alternately injected to purify the air.

[0039]The reservoir depth of the DND gas field is greater than 800 meters, the physical properties of the sand body are medium and low permeability, the permeability difference is small (0.58-1.96), and the heterogeneity is not serious. At present, the production wells have entered the stage of decline, and there are coal chemical plants around the gas reservoir. Consider surface reconstruction and injection-production technology to improve the recovery rate of the DND gas field. At present, the well spacing is 600-800m, and the existing well pattern is used to carry out CO 2 -Water is injected alternately, such as Figure 4 As shown, four wells were switched to injection, and the gas production rate was maintained at 2%, and the well pattern was 1 injection and 8 productions.

[0040] The specific implementation method steps are as follo...

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Abstract

The invention provides a method for gas purging through CO2-water alternating injection and application of the method. The method comprises the steps that CO2 is injected into a gas injection well, a producing well is closed, and the reservoir pressure is held to be high; and when the pressure of the producing well is restored to the original stratum pressure, the well is opened for production, and gas purging is conducted through CO2-water alternating injection. According to the method for gas purging through CO2-water alternating injection and the application of the method, through CO2-water alternating injection, the gas reservoir recovery efficiency can be improved, the purpose for retarding CO2 breakthrough is achieved, the problem that the design for the CO2-water alternating injection period is difficult is solved, and meanwhile the gas injection cost is reduced.

Description

technical field [0001] The present invention relates to the technical field of natural gas exploitation, more specifically, to a CO 2 - Method and application of alternate injection of water into purging gas. Background technique [0002] Due to the excessive dependence on fossil fuels (coal, oil, natural gas), the amount of greenhouse gas emissions produced in industrial production and human life is increasing, and the resulting air pollution and greenhouse effect are seriously threatening the survival of human beings. environment. The greenhouse gas carbon dioxide (CO 2 ) warms the global climate and poses a serious threat to human survival and social and economic development. CO 2 Effective utilization has become a topic of widespread concern around the world. Through continuous development and improvement, injecting CO into the reservoir 2 It has become a relatively mature technology, but injecting CO into gas reservoirs 2 The model is quite different from the res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16E21B43/20
CPCE21B43/164E21B43/20
Inventor 贾英史云清石志良严谨杨小松
Owner CHINA PETROLEUM & CHEM CORP
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