Development of degradable pre-formed particle gel(DPPG)as temporary plugging agent for petroleum drilling and production  

作　　者：Dao-Yi Zhu Xing-Yu Fang Ren-Xian Sun Zeng-Hao Xu Yang Liu Ji-Yang Liu 

机构地区：[1]College of Petroleum,China University of Petroleum-Beijing at Karamay,Karamay,834000,Xinjiang,China

出　　处：《Petroleum Science》2021年第2期479-494,共16页石油科学（英文版）

基　　金：This work was supported by the Research Foundation of China University of Petroleum-Beijing at Karamay(No.XQZX20200010);the Natural Science Foundation of Xinjiang Uygur Autonomous Region(No.2019D01B57);the University Scientific Research Project of Xinjiang Uygur Autonomous Region(No.XJEDU2019Y067);the Xinjiang Uygur Autonomous Region Innovation Environment Construction Project(No.2019Q025);the Sichuan Province Regional Innovation Cooperation Project(No.2020YFQ0036);the CNPC Strategic Cooperation Science and Technology Project(ZLZX2020-01-04-04)。

摘　　要：Temporary plugging agent(TPA)is widely used in many fields of petroleum reservoir drilling and production,such as temporary plugging while drilling and petroleum well stimulation by diverting in acidizing or fracturing operations.The commonly used TPA mainly includes hard particles,fibers,gels,and composite systems.However,current particles have many limitations in applications,such as insufficient plugging strength and slow degradation rate.In this paper,a degradable pre-formed particle gel(DPPG)was developed.Experimental results show that the DPPG has an excellent static swelling effect and self-degradation performance.With a decrease in the concentration of total monomers or cross-linker,the swelling volume of the synthesized DPPG gradually increases.However,the entire self-degradation time gradually decreases.The increase in 2-acrylamide-2-methylpropanesulfonic acid(AMPS)in the DPPG composition can significantly increase its swelling ratio and shorten the self-degradation time.Moreover,DPPG has excellent high-temperature resistance(150°C)and high-salinity resistance(200,000 mg/L NaCl).Core displacement results show that the DPPG has a perfect plugging effect in the porous media(the plugging pressure gradient was as high as 21.12 MPa),and the damage to the formation after degradation is incredibly minor.Therefore,the DPPG can be used as an up-and-coming TPA in oil fields.

关 键 词：Temporary plugging agents Pre-formed particle gel(PPG) Degradable PPG Petroleum drilling Petroleum production 

分 类 号：TE39[石油与天然气工程—油气田开发工程]