Partial hydrolysis polyacrylamide solution molecular agglutinant

Abstract

The present invention relates to an oil displacement solution molecular agglutination agent used in the later time of oil field development, in particular, it is a partially-hydrolyzed polyacrylamide solution molecular agglutination agent, and is formed from (wt%) 20-40% of aluminium chloride, 20-30% of hydrochloric acid, 20-30% of citric acid and 20-30% of alkali. After they are added into polyacrylamine solution, when the molecular weight of polymer is greater than 12000000, the microgranular diameter is 4-20 micrometers, and the weight blending ratio of polyacrylamide solution is 0.02-0.08%:0.004-0.008%, its oil displacement effect is good, it can greatly raise oil production rate, and is applicable to later-time development of oil field.

Description

Technical field: [0001] The invention relates to an oil displacement solution molecular coagulant used in the late stage of oilfield development, in particular to a partially hydrolyzed polyacrylamide solution molecular coagulant for improving the oil displacement effect. Background technique: [0002] At present, the systems that improve the generation of additives for partially hydrolyzed polyacrylamide flooding solutions are block colloids, which are injected into the oil well and only act as a plug in the near wellbore area, and it is difficult to really penetrate deep into the oil layer. For example, one of the application number 00103531.2 Flowable depth adjustment agent, after the two additives used interact with the partially hydrolyzed polyacrylamide solution, the formed massive colloid will quickly accumulate and block the oil layer near the wellbore during the injection process, and continue to inject under the pressure difference When these colloids are sheared b...

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Problems solved by technology

[0002] At present, the systems that improve the generation of additives for partially hydrolyzed polyacrylamide flooding solutions are block colloids, which are injected into the oil well and only act as a plug in the near wellbore area, and it is difficult to really penetrate deep into the oil layer. For example, one of the application number 00103531.2 Flowable depth adjustment agent, after the two additives used interact with the partially hydrolyzed polyacrylamide solution, the formed massive colloid will quickly accumulate and block the oil layer near the wellbore during the injection process, and continue to inject under the pressure difference When these colloids are sheared by the pores of the oil layer, they are quickly broken and degraded. Although they can flow deep into the oil layer, they have lost their colloidal state and cannot block the high-permeability water flow parts of the oil layer. Difficult to play a role in adjusting the permeability profile of oil layers in deep

Therefore, the oil displacement effect is very limited. Judging from the actual application situation in the oil field, the effect is not ideal. Moreover, due to the serious corrosion of the solution, the eastern test area has been put into production for less than a year. The stainless steel equipment and pipelines are severely perforated, and the injection pump has been replaced twice. had to stop the experiment

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