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degradable preformed particle gel as temporary plugging agent for low-temperature unconventional petroleum reservoirs:Effect of molecular weight of the cross-linking agent

引用

Petroleum Science 2022年第6期19卷 3182-3193页

作者： Hong-Jun Zhang Dao-Yi Zhu Yong-Long Gong Jun-Hui Qin Xiao-Ning Liu Yuan-Hang Pi Qi Zhao Run-Tian Luo Wan-Sheng Wang Ke-Ke Zhi Zong-Jie Mu China University of Petroleum-Beijing at Karamay KaramayXinjiang834000China

The development of unconventional petroleum resources has gradually become an important succession for increasing oil ***,the related engineers and researchers are paying more and more attention to the application of temporary plugging agents(TPAs)for their efficient *** can expand the stimulated reservoir volume(SRV)and facilitate the flow of oil and gas to the bottom of the ***-gels used as temporary plugging agents have the characteristics of the simple injection process,good deformation,high plugging strength,and complete self-degradation performance,which have been widely applied in recent *** this paper,five samples of DPPG polymerized by different molecular weights of cross-linking agents were *** addition,infrared spectroscopy analysis,differential calorimetry scanning(DSC)analysis,static particle gel swelling and degradation performance evaluation experiments,and dynamic temporary plugging performance experiments in cores were conducted at 34°*** show that as the molecular weight of the cross-linking agent(at 0.01 g)in the DPPG molecule decreased from 1,000 to 200 Da,the fewer cross-linking sites of DPPG,the looser the microscopic three-dimensional mesh structure *** swelling ratio increased from 7 to 33 ***,the complete degradation time increased from 40 to 210 ***,the DSC results confirmed that the higher the molecular weight of the cross-linking agent,the worse is chemical stability and the more prone it to *** samples had good temporary plugging performance in reservoir *** prepared by the cross-linking agent with smaller molecular weight has a stronger swelling ratio,higher gel strength,and greater plugging strength in the core ***,the degraded DPPG is less damaging to the ***,their slower degradation rates take a slightly longer times to reach complete *** results of this paper can provide new ideas and

关键词： Temporary plugging agent Preformed particle gel degradable cross-linking agent Molecular weight Low-temperature reservoir

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