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

Petroleum Science 2023年第5期20卷 2864-2878页

作者： Zheng Kang Hu Jia Zhong-Guo Li Biao Xia Yi Wang Yong Jiang Han-Lin Peng Petroleum Engineering Technology Institute of Southwest Petroleum Branch SINOPECDeyang618000SichuanChina National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation of Southwest Petroleum University Chengdu610500SichuanChina SINOPEC Southwest Petroleum Engineering Company Deyang618000SichuanChina

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 breaker”and“encapsulated breaker+breaking solution”were 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 solution”was 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.

关键词： gel breaking Polymer gel Ultra-high strength Chemical breakers Multistage network

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Rheological Property of The Regenerable Polyhydroxy Alcohol Fracturing Fluid System

Rheological Property of The Regenerable Polyhydroxy Alcohol ...

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The 2012 International Conference on Advanced Material and Manufacturing Science (ICAMMS 2012)

作者： Xiaorui Li Xiaojia Xue Huabo Fan Xiaojuan Lai Lei Wang Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry Ministry of EducationShanxi University of Science & Technology Research Institute of Oil&Gas Technology Changqing Oilfield Branch CompanyPetroChina National Engineering Laboratory for Exploration and Development of Low Permeability Oil and Gas Fields

According to the characteristic of polyhydroxy alcohol fracturing fluid system,the regeneration of the system was investigated for the first time.A stable organic boron crosslinking poly（vinyl alcohol） regenerable polyhydroxy alcohol fracturing fluid system was prepared,and the rheological property of the polyhydroxy alcohol fracturing fluid system with different regenerable times was also *** effect of regenerable times on the rheological property of the system was *** results indicated that the aims of gel breaking and regeneration can be achieved by regulating its pH value and controlling its crosslinking *** the increment of the regenerable time,both the temperature resistance and shearing resistance performances were decreased,and the viscoelasticity of the gel was also reduced.

关键词： Polyhydroxy alcohol fracturing fluid Crosslinking gel breaking Regeneration Rheological property

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