Composite blocking remover for water injection well

A composite plug-removing agent and a technology for water injection wells, which are applied in the directions of drilling compositions, chemical instruments and methods, etc.

Inactive Publication Date: 2020-06-12
克拉玛依市仁通科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to different clogging formation mechanisms, a composite plugging remover can be used to solve clogging problems caused by various causes, which greatly saves costs

Method used

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  • Composite blocking remover for water injection well

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A composite plugging removal agent for water injection wells, comprising the following components in parts by weight: 0.5 parts of ZYF-1 anti-swelling agent, 1 part of potassium chloride, 2 parts of fluorocarbon surfactant, 2 parts of alkylphenol polyoxyethylene ether, polyoxyethylene 5 parts of vinyl alcohol, 3 parts of citric acid, 3 parts of malic acid, 3 parts of oxalic acid, 3 parts of sodium edetate, 2 parts of sodium diethylenetriamine pentacarboxylate, 15 parts of sodium hypochlorite solution, 60.5 parts of water.

[0027] The preparation method comprises the following steps: firstly, adding fluorocarbon surfactant, alkylphenol polyoxyethylene ether, polyvinyl alcohol, sodium edetate and sodium diethylenetriaminepentacarboxylate into the enamel reaction kettle in proportion , slowly heat up to 75-80°C; secondly, add 10% water under continuous stirring, continue stirring for 30 minutes, then slowly cool down to 50-55°C, and then add citric acid, malic acid, oxalic...

Embodiment 2

[0029] A composite plugging removal agent for water injection wells, comprising the following components in parts by weight: 2.5 parts of ZYF-1 anti-swelling agent, 3 parts of ammonium chloride, 1 part of fluorocarbon surfactant, 1 part of alkylphenol polyoxyethylene ether, polyoxyethylene 1 part of vinyl alcohol, 2 parts of citric acid, 4 parts of malic acid, 2 parts of oxalic acid, 6 parts of sodium edetate, 2 parts of sodium diethylenetriamine pentacarboxylate, 25 parts of sodium hypochlorite solution, 50.5 parts of water.

[0030] Its preparation method includes the following steps: first, add fluorocarbon surfactant, alkylphenol polyoxyethylene ether, polyvinyl alcohol, sodium edetate and sodium diethylenetriaminepentacarboxylate into the enamel reaction kettle in proportion , slowly raise the temperature to 75-80°C; secondly, add 10% water under continuous stirring, continue stirring for 30 minutes, then slowly cool down to 50-55°C, and then add citric acid, malic acid, o...

Embodiment 3

[0032] A composite plugging removal agent for water injection wells, comprising the following components in parts by weight: 2 parts of ZYF-1 anti-swelling agent, 2 parts of ammonium chloride, 1 part of fluorocarbon surfactant, 1 part of alkylphenol polyoxyethylene ether, polyoxyethylene 3 parts of vinyl alcohol, 2 parts of citric acid, 4 parts of malic acid, 2 parts of oxalic acid, 6 parts of sodium edetate, 2 parts of sodium diethylenetriamine pentacarboxylate, 20 parts of sodium hypochlorite solution, 55 parts of water.

[0033] Its preparation method includes the following steps: first, add fluorocarbon surfactant, alkylphenol polyoxyethylene ether, polyvinyl alcohol, sodium edetate and sodium diethylenetriaminepentacarboxylate into the enamel reaction kettle in proportion , slowly raise the temperature to 75-80°C; secondly, add 10% water under continuous stirring, continue stirring for 30 minutes, then slowly cool down to 50-55°C, and then add citric acid, malic acid, oxal...

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Abstract

The invention discloses a composite blocking remover for a water injection well. The composite blocking remover comprises the following components in parts by weight: 0.5-2.5 parts of a ZYF-1 anti-swelling agent, 1-3 parts of a rock core treating agent, 1-5 parts of an active agent, 1-5 parts of polyvinyl alcohol, 5-15 parts of organic acid, 5-10 parts of an iron ion complexing agent, 15-25 partsof a sodium hypochlorite solution and 34.5-71.5 parts of water. Aiming at different blockage formation mechanisms, one composite blocking remover is adopted and the blockage problem caused by variousreasons can be solved, the cost is greatly saved, emulsification, organic scale formation, deemulsification and organic scale blockage in an oil storage layer can be effectively prevented, and crude oil extraction and water injection well augmented injection are facilitated. The composite blocking remover has good reservoir transformation characteristics and compatibility with reservoir fluid andis high in blocking removal success rate and long in blocking removal validity period.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection treatment agents, in particular to a composite plugging removal agent for water injection wells. Background technique [0002] In the process of oil field development, the properties of reservoir fluids in various oil production plants are complex and diverse, among which: crude oil has different viscosity and density and high wax content, formation water has complex water type and high salinity, oil and water well bores, pipe strings, Wax deposition, scaling and corrosion problems in the process pipe network are prominent. At the same time, oilfield water injection is mixed injection of clean and sewage, and the addition of chemicals for sewage treatment, injection water quality treatment, and mixing of injection water and formation water further aggravate the complex problem of reservoir fluid properties. At present, some water wells have secondary pollution problems due to mul...

Claims

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Application Information

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IPC IPC(8): C09K8/52C09K8/524
CPCC09K8/52C09K8/524
Inventor 杜小郭刘顺髙相
Owner 克拉玛依市仁通科技有限责任公司
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