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Chemical-enhancing type gas production technology

A chemical and gas extraction technology, applied in chemical instruments and methods, mining fluids, earth drilling and mining, etc., can solve the problems of poor foam stability, poor temperature and salt resistance, low foaming efficiency of foaming agents, etc., to achieve foam Good stability, good temperature and salt resistance, high foaming efficiency

Active Publication Date: 2017-09-05
成都百联油田技术服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The price of the foaming agent is not cheap, how to improve the utilization rate of the foaming agent, that is, how to make full use of the foaming agent to reduce the production cost
[0006] (2) The temperature and salinity in the gas well are high, the foaming efficiency of the existing foaming agent is not high, the foam stability is poor, and the temperature and salt resistance are poor. How to improve the performance of the foaming agent so that it can adapt to the bottom of the well high temperature and high salt environment
[0007] (3) In order to improve the performance of the foaming agent, non-ionic surfactants are added to the foaming agent in the prior art, and there are more polymers in the non-ionic surfactants. The depth of oil and gas wells is tens of meters or even hundreds of meters. meters, the depth of such a span makes it inevitable that polymeric nonionic surfactants will be affected by shear and acceleration forces, which will cause polymeric nonionic surfactants to degrade, thereby weakening The foaming effect of the foaming agent

Method used

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  • Chemical-enhancing type gas production technology
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  • Chemical-enhancing type gas production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0050] figure 1 A schematic diagram of the oil and / or gas production system of this embodiment is shown. like figure 1As shown, the system includes at least an injection system 10 , a production system 20 and a gas-liquid separation device 30 . The injection system 10 is used to inject a blowing agent into an oil and gas well. The production system 20 is used to lift oil and / or gas from the oil and gas well to a gas-liquid separation facility 30 . The gas-liquid separation device 30 separates the extracted substances. The gas separated by the gas-liquid separation device 30 is transported to the gas storage 40 for storage, the separated liquid is transported to the liquid storage 50 for storage, and the separated water injection mixture is transported to the water injection mixture storage 60 for storage. The water injection mixture contains the unreacted foaming agent, in order to improve the utilization rate of the foaming agent. The water injection mixture can be re-mi...

Embodiment 2

[0063] This embodiment is a further improvement on the basis of Embodiment 1, and only the improved part is described.

[0064] According to a preferred embodiment, the modified polyoxyethylene ether is obtained by sulfonation modification of fatty alcohol polyoxyethylene ether. Preferably, the modified polyoxyethylene ether is aliphatic alcohol polyoxyethylene ether sodium sulfate. The chemical formula of described fatty alcohol polyoxyethylene ether sodium sulfate is RO (CH 2 CHO) n SO 3 Na, where n is an integer between 2 and 10. Preferably, the fatty alcohol polyoxyethylene ether is prepared by using sodium hydroxide as a catalyst, and a long-chain fatty alcohol undergoes a ring-opening polymerization reaction with ethylene oxide in the absence of water and oxygen. The chemical reaction formula is:

[0065] ROH+n(C 2 H 4 O)→RO(CH 2 CHO) n H

[0066] Wherein, n is an integer between 2 and 10. The ether bond in the fatty alcohol polyoxyethylene ether molecule is n...

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Abstract

The invention relates to a chemical-enhancing type gas production technology. The method is characterized in that at least a filling system, an output system and a gas-liquid separating device are used for performing chemical-enhancing gas production. The technology comprises the following steps: filling a foaming agent which comprises at least modified polyoxyethylene ether and Gemini sulfonate on the basis of the weight ratio of 15-20: 1 into a filling well at the specified rate through a filling system based on the analysis of an oil-gas well; the foaming agent disperses around the filling well after arriving at the stratum under the gravity and / or pressure effect in order to reduce the surface tension of stratum water and lift oil and / gas from the stratum to the gas-liquid separating device through the output system; the gas and liquid which are separated through the gas-liquid separating device can be correspondingly conveyed to a gas storing device or a liquid storing device to be stored; the separated filled water mixture is conveyed into a filled water mixture storing device to be stored; the filled water mixture and the foaming agent are filled into the water filling well through the filling system according to the analysis on the filled water mixture.

Description

technical field [0001] The invention relates to the field of oil and gas field development engineering, in particular to a chemically enhanced gas recovery process. Background technique [0002] In the development of oil and gas fields, with the gradual decrease of the gas reservoir pressure and gas flow velocity, the produced water or condensate in the gas reservoir cannot be carried out of the wellbore with the gas flow, and thus stay in the wellbore. The liquid lingering in the wellbore accumulates at the bottom of the well for a period of time, forming a liquid column, which causes additional hydrostatic back pressure to the gas reservoir, resulting in a continuous decrease in the self-blowing energy of the gas well. If this condition persists, the build-up of liquid in the wellbore will eventually trap the gas pressure, causing the well to shut down. This phenomenon is called gas well fluid accumulation. In order to strengthen the oil and gas production process, the m...

Claims

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Application Information

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IPC IPC(8): E21B43/30E21B43/22E21B43/40E21B43/14C09K8/588
CPCC09K8/588E21B43/14E21B43/16E21B43/30E21B43/40
Inventor 白德旭李绍和曾义勇刘丹张林刘利丘家友
Owner 成都百联油田技术服务有限公司
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