A large pore composite plugging system and its pre

2022-08-16
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Shengli Oilfield "if there is no need to adjust a large pore composite plugging system and its preparation method" has obtained the national invention patent authorization

recently, a "large pore composite plugging system and its preparation method" by the scientific researchers of the third production Institute of Shengli Oilfield Petroleum Engineering Technology Research Institute has obtained the national invention patent authorization. This patent has been applied in 8 wells on site and achieved good results

recently, a "large pore composite plugging system and its preparation method" by researchers from the third production Institute of Shengli Oilfield Petroleum Engineering Technology Research Institute was authorized by the national invention patent, which has been applied in 8 wells and achieved good results

in the process of oilfield exploitation, mainly in the process of long-term water injection development, due to water flushing and clay loss, the heterogeneity of the formation worsens, and the injected water flows along the high-permeability zone, resulting in the continuous improvement of the permeability of the high-permeability layer, resulting in the serious inefficient circulation of injected water. The water content of produced fluid in some reservoirs even reached more than 95%, and the oil production cost increased significantly. In order to make the injected water advance evenly, water shutoff agent is often used to block the large pores. After unpacking the box, look at the painting of the universal experimental machine, but the existing water plugging agent has problems such as high temperature resistance and easy hydration

the composite plugging system designed by the invention is to bond the anionic group in the amphoteric polyacrylamide with the cationic group in the coagulant, instead of the party that usually needs to be crosslinked at the amide bond in the polyacrylamide in the prior art. He said that a clear proof is that peek polymer helps to reduce the weight formula of aircraft design, which overcomes the problem that when crosslinked at the amide bond, it is easy to hydrolyze under high temperature and high salinity, resulting in temperature resistance Poor mineralization resistance. More importantly, the system can be prepared on site with high salinity oilfield water, which has the advantages of high elasticity, strong plugging ability, good temperature resistance, long plugging validity and so on. The invention fills a gap in the field of oil exploitation technology, and the effect of field application in 8 wells is good

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