Shaftplug removal agent for restoring gas wellreservoirpermeability

A technology of permeability and plugging remover, which is applied in the field of gas field development, can solve the problem of weak corrosion of plugging remover, and achieve the effect of stable product performance, improved performance and weak corrosion

Inactive Publication Date: 2017-06-27
徐小虎 +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese invention patent CN201110102242.8 discloses a wellbore plugging remover for gas wells. The plugging remover is weak in corrosion, and the product performance is stable at high temperature, which can reduce water lock and scale damage in the near wellbore area of ​​the gas well. However, the dissolution of the plugging remover Performances such as composite plugging speed and reservoir permeability recovery rate still need to be improved, so it is necessary to do further research on wellbore plugging remover for gas wells

Method used

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  • Shaftplug removal agent for restoring gas wellreservoirpermeability

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Effect test

Embodiment 1

[0016] A wellbore plug-removing agent for repairing the permeability of gas well reservoirs, comprising the following main components: alcohol ether compound, formaldehyde, fluorocarbon surfactant, glucoside, chelating agent, sulfamic acid and water.

[0017] Described alcohol ether compound is ethylene glycol-propyl ether;

[0018] Described chelating agent is EDTA.

[0019] The wellbore plug-removing agent for repairing the permeability of gas well reservoirs includes the following components by weight percentage: alcohol ether compound: 17%, formaldehyde: 0.25%, fluorocarbon surfactant: 0.007%, glucoside (APG) 9%, chelating agent: 4%, sulfamic acid 7%, water: balance.

Embodiment 2

[0021] A wellbore plug-removing agent for repairing the permeability of gas well reservoirs, comprising the following main components: alcohol ether compound, formaldehyde, fluorocarbon surfactant, glucoside, chelating agent, sulfamic acid and water.

[0022] Described alcohol ether compound is ethylene glycol-butyl ether;

[0023] Described chelating agent is EDTA.

[0024] The wellbore plug-removing agent for repairing the permeability of gas well reservoirs includes the following components by weight percentage: alcohol ether compound: 15%, formaldehyde: 0.5%, fluorocarbon surfactant: 0.005%, glucoside (APG) 15%, chelating agent: 0.5%, sulfamic acid 8%, water: balance.

Embodiment 3

[0026] A wellbore plug-removing agent for repairing the permeability of gas well reservoirs, comprising the following main components: alcohol ether compound, formaldehyde, fluorocarbon surfactant, glucoside, chelating agent, sulfamic acid and water.

[0027] The alcohol ether compound is any one of ethylene glycol-diethyl ether, ethylene glycol-propyl ether, ethylene glycol-butyl ether or diethylene glycol-diethyl ether;

[0028] Described chelating agent is EDTA.

[0029] The wellbore plug-removing agent for repairing the permeability of gas well reservoirs includes the following components by weight percentage: alcohol ether compound: 25%, formaldehyde: 0.2%, fluorocarbon surfactant: 0.008%, glucoside (APG) 8%, chelating agent: 5%, sulfamic acid 6%, water: balance.

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Abstract

The invention provides ashaftplug removal agent for restoring gas wellreservoirpermeability. The shaftplug removal agent is mainly prepared from an alcohol ether compound, formaldehyde, a fluorocarbon surfactant, glucoside, a chelating agent, sulfamic acid and water. The glucoside, the fluorocarbon surfactant and the sulfamic acid are used together, the corrosivity is poor, the product performance is stable under high temperature, and the properties such as composite stopper dissolving speed and reservoirpermeability restoring rate are remarkably improved. The fluorocarbon surfactant contains halogen and has a certain influence on the environment. A trace amount of the fluorocarbon surfactant is added, and the harm to the environment is smaller. The solvent in the agent is water, the water content can be up to 50% or above, and the agent is low in cost, ecological and safe.

Description

technical field [0001] The invention relates to the technical field of gas field development, in particular to a wellbore plug-removing agent for restoring the permeability of gas well reservoirs. Background technique [0002] In the process of gas well exploitation, the salinity of the produced water is high, and some gas well strings are severely corroded and scaled. Therefore, it is necessary to periodically inject corrosion inhibitors into the wellbore for a long time for gas well anticorrosion. With the prolongation of gas well production time, the joint action of corrosion inhibitor cracking residues, pipe string corrosion products, gas well output fluid and other well-entry agents will cause organic or inorganic blockage in the wellbore of the gas well, resulting in the failure of normal production of the gas well, and even being forced to Well shutting down will seriously affect the effective production of a single well, and also affect the operating time rate, utili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
CPCC09K8/52
Inventor 徐小虎钟成旭李彦飞罗洁龙斌刘新伟熊业刚杨干
Owner 徐小虎
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