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Composite blocking remover for class-II oil reservoir polymer injection well

A technology of compound plug removing agent and polymer injection well, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of corrosion of pipe strings and downhole tools, secondary pollution of formation, unsatisfactory effect, etc. Satisfy the demand of oil layer plug removal, less oil layer damage and good safety effect

Active Publication Date: 2016-11-09
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] , sodium nitrite and sodium citrate), this formula system is mainly used in polymer injection wells to degrade polymer micelles by oxidation, but the effect is not ideal
Slug treatment is performed during the plugging removal process. Due to its strong acidity, it is corrosive to the pipe string and downhole tools. In the later stage of the shut-in reaction, precipitation and crystallization will occur near the wellbore, causing secondary pollution of the formation.

Method used

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  • Composite blocking remover for class-II oil reservoir polymer injection well
  • Composite blocking remover for class-II oil reservoir polymer injection well
  • Composite blocking remover for class-II oil reservoir polymer injection well

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Embodiment 1

[0019] Composite plugging remover for polymer injection wells of the first and second types of oil layers, calculated according to the mass percentage, its composition is:

[0020] 3% scale dissolver,

[0021] Breaker 0.5%,

[0022] Ionic stabilizer 0.5%,

[0023] Emulsifier 1%,

[0024] Active cleaning agent 0.5%,

[0025] Clay stabilizer 0.5%,

[0026] Water 94%;

[0027] The scale dissolver is HM-202 neutral cleaning agent, purchased from Gansu Heima Petrochemical Engineering Co., Ltd.; the clay stabilizer is purchased from Daqing Wuren Auxiliary Factory, model QY-138.

[0028] The gel breaker is potassium persulfate, the ion stabilizer is sodium citrate, the emulsifier is octylphenol-10 (OP-10), and the active cleaning agent is sodium dodecylbenzenesulfonate.

[0029] 2. Preparation method of plugging agent: Take the preparation of a single ton of medicine as an example, prepare 0.94 tons of clear water, first add 0.03 tons of neutral detergent, stir with a stirrer a...

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Abstract

The invention discloses a composite blocking remover for a class-II oil reservoir polymer injection well, and solves the problems that conventional blocking removing systems are serious in corrosion and low in removing efficiency. The blocking remover is prepared from the following components in percentage by mass: 2-5% of a scale dissolving agent, 0.5-1% of a cracking agent, 0.5-1% of an ion stabilizing agent, 0.5-1% of an emulsifying agent, 0.5-1% of an activity cleaning agent, 0.5-1% of a clay stabilizing agent and the balance of water. The components of the blocking remover are favorable in compatibility, stability and safety, the dissolving rate for polymer colloid achieves 90.34%, the corrosion rate is 0.3g / m<2->.h, the stability of residual liquid is high, and damage to an oil reservoir is small.

Description

technical field [0001] The invention relates to a plug-removing agent for oil recovery engineering in oil fields. Background technique [0002] The current plug-removing formula system consists of A treatment agent (oxidant, stabilizer, crystal nucleus stripping agent, preservative, surfactant, initiator, etc.), B acid agent (hydrochloric acid, hydrofluoric acid, corrosion inhibitor, demulsifier, detergent, etc.) and displacement fluid (sodium carbonate [0003] , sodium nitrite and sodium citrate), this formula system is mainly used in polymer injection wells to degrade polymer micelles by oxidation, but the effect is not ideal. The slug treatment during the plugging removal process is corrosive to the pipe string and downhole tools due to its strong acidity. In the later stage of the shut-in reaction, precipitation and crystallization will occur near the wellbore, causing secondary pollution of the formation. Contents of the invention [0004] The object of the present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524
Inventor 任成锋郑焕军崔金哲高恒达孙淑芬
Owner PETROCHINA CO LTD
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