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Descaling and plugging removal agent used for oil field injection and production layer

A plug remover, oilfield technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of affecting the effect of acidification plug removal, poor deep treatment effect, excessive dissolution, etc., and achieves excellent retardation effect and protection. The effect of oil layer and easy sand production

Inactive Publication Date: 2017-08-18
CHENGDU DUTEWEI PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional acidizing and plugging removal has problems such as excessive dissolution of near-well reservoir rocks, poor deep treatment effect, secondary precipitation, and removal of polymer residues, which seriously affect the effect of acidizing plugging removal.

Method used

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  • Descaling and plugging removal agent used for oil field injection and production layer
  • Descaling and plugging removal agent used for oil field injection and production layer
  • Descaling and plugging removal agent used for oil field injection and production layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Organic multifunctional plugging remover

[0064]

[0065] Inorganic multifunctional plugging remover

[0066]

[0067] multifunctional compound synergist

[0068]

[0069]

[0070] The organic multifunctional plugging agent is made into an aqueous solution of 50% by mass; the inorganic multifunctional plugging agent is made into an aqueous solution of 25% by mass; the multifunctional composite synergist is made into an aqueous solution of 25% by mass.

[0071] The method of use is in accordance with the usual method of using a plugging agent. The three agents can be injected into the treatment oil-water well in the order of organic multifunctional plugging remover A / inorganic multifunctional plugging remover B / multifunctional composite synergist C according to the designed slug structure within the concentration range specified above to exert Their respective effects and mutual synergies can achieve the best plug-removing effect.

Embodiment 2

[0073] Organic multifunctional plugging agent A

[0074]

[0075] Inorganic multifunctional plugging remover B

[0076]

[0077] Compound multifunctional synergist

[0078]

[0079] The inorganic multi-functional plug-removing agent is formulated into a 50% mass fraction aqueous solution; the multifunctional composite synergist is formulated into a 50% mass fraction aqueous solution. According to the usual method of using plugging agents, the three agents can be used in the order of organic multifunctional blocking agent A / inorganic multifunctional blocking agent B / multifunctional composite synergist C according to the designed slug structure and in the above Inject into oil and water wells within the specified concentration range to exert their respective effects and mutual synergies to achieve the best plugging removal effect.

Embodiment 3

[0081] Organic multifunctional plugging remover

[0082]

[0083] Inorganic multifunctional plugging remover

[0084]

[0085] multifunctional compound synergist

[0086]

[0087]

[0088] The organic multifunctional plugging agent is made into an aqueous solution with a mass fraction of 75%, the inorganic multifunctional plugging agent is made into an aqueous solution with a mass fraction of 35%, and the multifunctional composite synergist is made into an aqueous solution with a mass fraction of 35%.

[0089] The method of use is in accordance with the usual method of using a plugging agent. The three agents can be injected into the treatment oil-water well in the order of organic multifunctional plugging remover A / inorganic multifunctional plugging remover B / multifunctional composite synergist C according to the designed slug structure within the concentration range specified above to exert Their respective effects and mutual synergies can achieve the best plug...

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Abstract

The invention belongs to the technical field of oil field chemical descaling and plugging removal agents to solve the technical problem that an existing plugging removal processing effect is poor. A descaling and plugging removal agent used for an oil field injection and production layer comprises an organic multifunctional plugging removal agent, an inorganic multifunctional plugging removal agent and a multifunctional composite synergist. The organic multifunctional plugging removal agent comprises carbon 7-9 aromatic hydrocarbon, a polyoxyethylene ether surfactant, an oil-soluble water-dispersible polyether demulsifier, fatty alcohol-polyoxyethylene ether, a polyether wetting agent and a mutual solvent; the inorganic multifunctional plugging removal agent comprises hydrochloric acid, modified silicic acid, a sulfate scale complexing dispersant, a cationic polymer clay stabilizer, a water-soluble polyether demulsifier, a corrosion inhibitor, an iron ion stabilizer and a polyether wetting and improving agent; the multifunctional composite synergist comprises hydrochloric acid, acetic acid, a corrosion promoter, a polyether wetting and improving agent, a cationic polymer sand stabilizing agent, an iron ion stabilizing agent and a conversion agent.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemical descaling and plugging removal agents, and in particular relates to a descaling and plugging removal agent used for oilfield injection-production layers. Background technique [0002] In recent years, with the continuous shortage of energy in the world and the continuous development of the petroleum industry, tertiary oil recovery technology has gradually attracted people's attention and made significant progress. Increased injection of water injection wells and unplugging of oil wells also caused certain problems. In the past, conventional chemical plugging removal was one of the important measures for increasing the production of oil wells and increasing injection of water wells in oilfields that have entered into tertiary oil recovery development. Deep treatment and improving the effect of plugging removal are important topics in the research of chemical plugging removal technology. ...

Claims

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Application Information

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IPC IPC(8): C09K8/524C09K8/528
CPCC09K8/524C09K8/528
Inventor 王波陈鹏
Owner CHENGDU DUTEWEI PETROLEUM TECH
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