Combined blocking remover for polymer injection blocking well section plug and preparation method and application of combined blocking remover
A technology of plugging agent and well section, applied in the field of tertiary oil recovery, can solve the problem of difficult effective contact and reaction between chemical agents and corresponding blockages, ignore the characteristics of deep plugging in polymer injection plugged wells, and the plugging removal effect is far from indoor test results and other problems, to achieve the effect of improving plugging removal efficiency, removing oily dirt plugging, and good fluidity
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[0033] Example 1
[0034] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 5%, ammonium chloride 2%, the balance is water; oxidized gel breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 20%, active agent 2%, JHS-1 steel anti-oxidation corrosion inhibitor 2%, ethanol 5%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 10%, citric acid 20%, fluoboric acid 6%, ammonium bifluoride 3%, ammonium chloride 1%, JHB-1 type high-efficiency oil washing agent 3%, JHS-1 steel anti-oxidation corrosion ...
Example Embodiment
[0040] Example 2
[0041] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 2%, ammonium chloride 1%, the balance is water; oxidizing gel-breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 10%, active agent 1%, JHS-1 steel anti-oxidation corrosion inhibitor 0.5%, ethanol 2%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 5%, citric acid 10%, fluoboric acid 5%, ammonium bifluoride 2%, ammonium chloride 1%, JHB-1 type high-efficiency oil washing agent 2%, JHS-1 steel anti-oxidation corrosio...
Example Embodiment
[0043] Example 3
[0044] The polymer injection plugging well slug combined deblocking agent in this embodiment includes a pretreatment slug deblocking agent, an oxidized gel-breaking slug deblocking agent, and a post synergistic slug deblocking agent. Among them, the pretreatment slug removing agent is composed of the following components by weight percentage: JHB-1 type high-efficiency oil washing agent 3.5%, ammonium chloride 1.5%, the balance is water; oxidizing gel-breaking slug removing agent It is composed of the following components by weight percentage: sodium percarbonate 15%, active agent 1.5%, JHS-1 steel anti-oxidation corrosion inhibitor 1.2%, ethanol 3.5%, the balance is water; post-installed synergistic slug The blocking agent is composed of the following components by weight percentage: sodium chlorite 7.5%, citric acid 15%, fluoboric acid 5.5%, ammonium bifluoride 2.5%, ammonium chloride 1.5%, JHB-1 type high-efficiency oil washing agent 2.5%, JHS-1 steel anti-...
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