A kind of descaling agent for water injection well and its preparation method and application

A technology for water injection wells and descaling agents, applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of secondary pollution in the formation, easy residue of descaling agents, etc., and achieve good flowback performance Effect

Active Publication Date: 2018-08-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The descaling agent provided by the prior art tends to remain in the formation, causing secondary pollution to the formation

Method used

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  • A kind of descaling agent for water injection well and its preparation method and application
  • A kind of descaling agent for water injection well and its preparation method and application

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preparation example Construction

[0038] In the second aspect, the embodiment of the present invention provides the preparation method of the above water injection well descaling agent, comprising: according to the ratio of each component in the water injection well descaling agent, adding water to the batching tank, and then adding water to the batching tank Add a dissolving agent and a dispersant to the mixture, stir evenly, then add a corrosion inhibitor and a drainage aid into the batching tank, and after stirring evenly again, add a suspending agent into the batching tank to obtain a descaling agent for water injection wells .

[0039] It can be understood that the descaling agent for water injection wells includes the following components in mass percentage: scale dissolving agent 25-40%, dispersant 3-6%, corrosion inhibitor 3-6%, drainage aid 3-6% %, suspending agent 1-3%, and the balance is water. The scale dissolving agent is hydrochloric acid with a concentration of 25-37%; the dispersant is selecte...

Embodiment 1

[0049] This embodiment provides a water injection well descaling agent, including the following components in mass percentage: scale dissolving agent 25%, dispersant 3%, corrosion inhibitor 3%, drainage aid 3%, suspending agent 1% , the balance is water;

[0050] Wherein, the scale dissolving agent is hydrochloric acid with a concentration of 25%; the dispersant is sodium lauryl sulfate; the corrosion inhibitor is; the drainage aid is dodecylpyridinium bromide; the suspending agent is lignin.

[0051] The preparation method of the descaling agent for water injection wells is as follows: according to the ratio of the components in the descaling agent for water injection wells, water is added to a batching tank with a stirrer, and then a dissolving agent and a dispersant are added to the batching tank, After stirring evenly, add corrosion inhibitor and drainage aid into the batching tank, and after stirring again, add suspending agent into the batching tank to obtain the descali...

Embodiment 2

[0053] This embodiment provides a water injection well descaling agent, including the following components in mass percentage: scale dissolving agent 40%, dispersant 6%, corrosion inhibitor 6%, drainage aid 6%, suspending agent 3% , the balance is water;

[0054] Among them, the scale dissolving agent is hydrochloric acid with a concentration of 37%; the dispersant is 1-methylpentanol; the corrosion inhibitor is benzyl quinoline quaternary ammonium chloride; the drainage aid is cetylpyridinium bromide; The agent is lignin.

[0055] The preparation method of the descaling agent for water injection wells is as follows: according to the ratio of the components in the descaling agent for water injection wells, water is added to a batching tank with a stirrer, and then a dissolving agent and a dispersant are added to the batching tank, After stirring evenly, add corrosion inhibitor and drainage aid into the batching tank, and after stirring again, add suspending agent into the bat...

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Abstract

The invention discloses a scale remover for a water injection well, and a preparation method and an application of the scale remover, and belongs to the field of oil field development. The scale remover comprises the following components, by mass, 25-40% of a scale-dissolving agent, 3-6% of a dispersant, 3-6% of a corrosion inhibitor, 3-6% of a cleanup additive, and 1-3% of a suspending agent, with the balance being water. The scale-dissolving agent is a hydrochloric acid solution having a concentration of 25-37%; the dispersant is selected from at least one of carboxymethyl cellulose, sodium dodecyl sulfate, and 1-methylpentanol; the corrosion inhibitor is chloridized benzylquinoline quaternary ammonium salt; the cleanup additive is selected from at least one of dodecylpyridinium bromide, hexadecylpyridinium bromide, and octadecylpyridinium bromide; and the suspending agent is lignin. The scale remover can deeply remove scale, has a corrosion inhibition function, is easy to flow back, and doesn't cause secondary pollution on the stratum.

Description

technical field [0001] The invention relates to the field of oil field development, in particular to a scale remover for water injection wells, a preparation method and application thereof. Background technique [0002] In the process of oilfield water injection development, water injection wells are usually used to inject water into the oil reservoir to maintain or restore the pressure of the oil layer, so that the oil reservoir has a strong driving force, so as to increase the production speed and recovery rate of the oil reservoir. However, during the use of water injection wells, due to corrosion, precipitation, gelling, carbon deposition, bacterial reproduction, etc., it is easy to cause scaling on the inner wall of the pipe string. The deposition of scale will cause local electrochemical corrosion of the pipe string and reduce the flow cross section Area, increase hydraulic resistance and transport energy, block oil well channels, thereby reducing oil well production. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52C09K8/54E21B37/06E21B41/02
Inventor 宁萌萌赵新红余东合夏健李凝龙长俊宋峰
Owner PETROCHINA CO LTD
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