Study on the main controlling factors affecting the viscosity of wastewater polymerize in high-temperature and high-salt reservoirs and the system of profile control and water drive
Aiming at the key problem of water injection development in high water content oilfield in Gaaskul reservoir in recent years,we carried out the research on high mineralization and high hardness wastewater polymerization and dissection and drive system,mainly by analyzing the main controlling factors affecting the performance of wastewater polymerization solution in Gaaskul field,and then carried out the research of formulation preference,performance evaluation,and drive mechanism for polymer-based dissection and drive system.The experimental results show that the main controlling factors of the performance of wastewater polymerization are in the following order:Fe2+＞Fe3+＞microbial IB＞microbial TGB＞dissolved oxygen＞microbial SRB＞Mg2+＞Ca2+＞Na+＞K+;the optimal formulations of the dissection and drive system are determined as follows:0.5％main reagents AS-5+0.2％crosslinking agent ZK-1+0.1％stabilizer thiourea+0.1％modifier HEDP.The results of blocking and oil driving experiments show that the system has excellent blocking performance with 94.7％blocking rate,and the system has good oil driving performance and ability to improve the non-homogeneity of the formation.This study provides theoretical guidance and technical support for the efficient development of high temperature and high salt reservoirs,and has significant practical significance.
wastewater polymerizationcontrolling factortemperature and salt resistanceprofiling and drivingenhanced recovery
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