Comprehensive evaluation of chemical breakers for multistage network ultra-high strength gel

作     者：Zheng Kang Hu Jia Zhong-Guo Li Biao Xia Yi Wang Yong Jiang Han-Lin Peng 

作者机构：Petroleum Engineering Technology Institute of Southwest Petroleum BranchSINOPECDeyang618000SichuanChina National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of Southwest Petroleum UniversityChengdu610500SichuanChina SINOPEC Southwest Petroleum Engineering CompanyDeyang618000SichuanChina 

出 版 物：《Petroleum Science》 (石油科学（英文版）)

年 卷 期：2023年第20卷第5期

页      面：2864-2878页

核心收录：

学科分类：0820[工学-石油与天然气工程] 08[工学] 0703[理学-化学] 082002[工学-油气田开发工程] 

基　　金：supported by Fok Ying-Tong Education Foundation(Grant No.171043) Sichuan Science and Technology Program(Award No.2020YFQ0036) 

主　　题：Gel breaking Polymer gel Ultra-high strength Chemical breakers Multistage network 

摘      要：Polymer gels have been accepted as a useful tool to address many sealing operations such as drilling and completion,well stimulation,wellbore integrity,water and gas shutoff,***,we developed an ultra-high strength gel(USGel)for medium to ultra-low temperature ***,the removal of USGel is a difficult problem for most temporary plugging *** paper first provides new insights into the mechanism of USGel,where multistage network structure and physical entanglement are the main reasons for USGel possessing ultra-high *** the effects of acid breakers,encapsulated breakers,and oxidation breakers(including H_(2)O_(2),Na_(2)S_(2)O_(8),Ca(ClO)_(2),H_(2)O_(2)+NaOH,Na_(2)S_(2)O_(8)+NaOH,and Ca(ClO)_(2)+NaOH)were *** effects of component concentration and temperature on the breaking solution were studied,and the corrosion performance,physical simulation and formation damage tests of the breaking solution were carried *** final formulation of 2%-4%NaOH+4.5%-6%H_(2)O_(2) breaking solution was determined,which can make USGel completely turn into water at 35e105*** combinations of“acid t breaking solution,“acid+encapsulated breakerand“encapsulated breaker+breaking solutionwere evaluated for breaking *** acid gradually reduced the volume of USGel,which increased the contact area between breaking solution and USGel,and the effect of“4%acid+breaking solutionwas 23 times higher than that of breaking solution alone at 35***,the acid significantly reduced the strength of *** paper provides new insights into the breaking of high-strength gels with complex network structures.