Resin plugging agents play a pivotal role in addressing casing damage in oil and gas fields.However,the widespread use of epoxy resin is constrained by its high cost and non-renewable origin,while plant-based resins o...Resin plugging agents play a pivotal role in addressing casing damage in oil and gas fields.However,the widespread use of epoxy resin is constrained by its high cost and non-renewable origin,while plant-based resins often suffer from inadequate mechanical properties,which limit their effectiveness in such applications.This study introduces BEOPA,an innovative,renewable,high-strength resin plugging agent derived from epoxidized soybean oil(ESO)and enhanced with bisphenol A-type benzoxazine(BZ).In this study,the synthesis process,reactionmechanism,and application performance of this novelmaterial are systematically presented,explored and optimized.It is shown that the optimal formulation of BEOPA includes 41.4 wt%ESO,24.8 wt%BZ,24.8 wt%methylhexahydrophthalic anhydride(MHHPA),8.2 wt%styrene(ST),and 0.8 wt%N,N-dimethylbenzylamine(BDMA),yielding an impressive compressive strength of 93.7 MPa.The integration of ESO and BZ creates an intricate and robust double crosslinking network,significantly enhancing material strength and durability.BEOPA exhibits a tunable curing time,ranging from 0.5 to 15 h,with viscosities below 300 mPa⋅s at 25℃and 75mPa⋅s at 50℃.Furthermore,it demonstrates exceptional thermal stability within the 100℃-150℃range,even in environments with mineral salt concentrations as high as 43,330 mg/L.Remarkably,BEOPA achieves superior plugging performance,sustaining breakthrough pressures exceeding 29.7 MPa in 1 mm crack cores.展开更多
The goal of the research was to investigate the profile control and oil displacement characteristics of the polymer nanoparticles after high temperature swelling.The displacement parameters showed considerable influen...The goal of the research was to investigate the profile control and oil displacement characteristics of the polymer nanoparticles after high temperature swelling.The displacement parameters showed considerable influence on the plugging effect of the high-temperature swelled polymer nanoparticles,such as the core permeability,concentration of nanoparticles in the suspension,swelling time and swelling temperature,which makes it flexible to control the plugging effect by controlling displacement experiments conditions.Experimental results show that polymer nanoparticles dispersion system with a concentration of 500 mg/L is suitable for cores plugging with a permeability of 30×10^(-3)-150×10^(-3)μm^(2),even after aging at 150℃ for three months.The shunt flow experiments show that when the displacement factors are optimal values,the polymer nanoparticles after high temperature swelling to plug the high-permeability layer selectivity and almost do not clog the low-permeability layer.Oil recovery of homogeneous artificial core displacement experiment and a heterogeneous double-tube cores model are increased by 20%and 10.4%on the basis of water flooding.The polymer nanoparticles can be a great help for petroleum engineers to better apply this deep profile control and flooding technology.展开更多
Pressure activated sealant(PAS),as a novel kind of sealingfluid,can provide rapid and self-adapting repair on the tiny damage of static seals(e.g.,screws and pipelines)while encountering pressure difference of leakage...Pressure activated sealant(PAS),as a novel kind of sealingfluid,can provide rapid and self-adapting repair on the tiny damage of static seals(e.g.,screws and pipelines)while encountering pressure difference of leakage sites,but its sealing property is affected more by the size of leakage site,so it exhibits limited application in the production and wellbore integrity recovery of oil&gas wells.To extend PAS's applicability,this paper put forward a composite PAS technology involving the cooperativity of solid and liquid sealing materials for enhancing large pore plugging based on the phase state transition and sealing behaviors of sealingfluid under differential pressure.In this technology,two types of solid sealing materials(bridging rigid particle and tension reinforcingfiber)were used jointly to modify the geometries of leakage pores and the migration paths offluids,which can promote the formation of effective solid barrier from the PAS tofill in large leaking pores,so as to perform sealing repair.And the following laboratory experimental results were obtained.First,the newly prepared PAS is a kind of polydisperse system,and the core particles are regular in shape with the size distribution mainly in a range of 300e400 mm.Second,in the range of evaluation pressure,sepiolitefiber,as the structure promoter,reinforces the integrity of sealing solids.Third,mussel powder,as the pore structure modifier,improves the retention ability of the sealingfluid in the limited leakage space.These two sealing materials not only cooperatively improve the structure of solid barrier,but also markedly enhance the plugging capability of composite PAS in large pores.In conclusion,these results can provide theoretical and technical support for the development and application of novel multifunctional sealants in oil&gas wells.展开更多
基金supported by the National Natural Science Foundation of China(U23B20156,52174033).
文摘Resin plugging agents play a pivotal role in addressing casing damage in oil and gas fields.However,the widespread use of epoxy resin is constrained by its high cost and non-renewable origin,while plant-based resins often suffer from inadequate mechanical properties,which limit their effectiveness in such applications.This study introduces BEOPA,an innovative,renewable,high-strength resin plugging agent derived from epoxidized soybean oil(ESO)and enhanced with bisphenol A-type benzoxazine(BZ).In this study,the synthesis process,reactionmechanism,and application performance of this novelmaterial are systematically presented,explored and optimized.It is shown that the optimal formulation of BEOPA includes 41.4 wt%ESO,24.8 wt%BZ,24.8 wt%methylhexahydrophthalic anhydride(MHHPA),8.2 wt%styrene(ST),and 0.8 wt%N,N-dimethylbenzylamine(BDMA),yielding an impressive compressive strength of 93.7 MPa.The integration of ESO and BZ creates an intricate and robust double crosslinking network,significantly enhancing material strength and durability.BEOPA exhibits a tunable curing time,ranging from 0.5 to 15 h,with viscosities below 300 mPa⋅s at 25℃and 75mPa⋅s at 50℃.Furthermore,it demonstrates exceptional thermal stability within the 100℃-150℃range,even in environments with mineral salt concentrations as high as 43,330 mg/L.Remarkably,BEOPA achieves superior plugging performance,sustaining breakthrough pressures exceeding 29.7 MPa in 1 mm crack cores.
基金funded by National Natural Science Foundation of China No.51874316 and 51274211National Key Scientific and Technological Project(Grant No.2017ZX05009-004)。
文摘The goal of the research was to investigate the profile control and oil displacement characteristics of the polymer nanoparticles after high temperature swelling.The displacement parameters showed considerable influence on the plugging effect of the high-temperature swelled polymer nanoparticles,such as the core permeability,concentration of nanoparticles in the suspension,swelling time and swelling temperature,which makes it flexible to control the plugging effect by controlling displacement experiments conditions.Experimental results show that polymer nanoparticles dispersion system with a concentration of 500 mg/L is suitable for cores plugging with a permeability of 30×10^(-3)-150×10^(-3)μm^(2),even after aging at 150℃ for three months.The shunt flow experiments show that when the displacement factors are optimal values,the polymer nanoparticles after high temperature swelling to plug the high-permeability layer selectivity and almost do not clog the low-permeability layer.Oil recovery of homogeneous artificial core displacement experiment and a heterogeneous double-tube cores model are increased by 20%and 10.4%on the basis of water flooding.The polymer nanoparticles can be a great help for petroleum engineers to better apply this deep profile control and flooding technology.
基金supported by the National Science and Technology Major Project".Drilling fluid and cementing technicalrescarch for shale gas horizontal wells"(No.:2016ZX05060-015)Welfare Technology Reseach Project of Zhejiang Province"Pressure activated sealant(PAS)for the tiny leakage in the offshore oil and gas development and its self-adapting repair mechanism research"(No.:LGG20E040002)+2 种基金Scientific Rescarch Project of Education Department of Zhejiang Province"Self-adapting repair behavior research for the tiny damage of the new-type pressure activated scalant(PAS)(No.:Y201840431)Zhoushan Science and Technology Plan Project"Pressure controlled-release targeted repair technology rescarch for the sealingHlamage of offshore oil and gas wells"(No:2019C21006)Innovative Program of Zhejiang Occan University"Self-adapting plugging agent for oil and gas pipelines and its action mechanism"(No.XJ2018082).
文摘Pressure activated sealant(PAS),as a novel kind of sealingfluid,can provide rapid and self-adapting repair on the tiny damage of static seals(e.g.,screws and pipelines)while encountering pressure difference of leakage sites,but its sealing property is affected more by the size of leakage site,so it exhibits limited application in the production and wellbore integrity recovery of oil&gas wells.To extend PAS's applicability,this paper put forward a composite PAS technology involving the cooperativity of solid and liquid sealing materials for enhancing large pore plugging based on the phase state transition and sealing behaviors of sealingfluid under differential pressure.In this technology,two types of solid sealing materials(bridging rigid particle and tension reinforcingfiber)were used jointly to modify the geometries of leakage pores and the migration paths offluids,which can promote the formation of effective solid barrier from the PAS tofill in large leaking pores,so as to perform sealing repair.And the following laboratory experimental results were obtained.First,the newly prepared PAS is a kind of polydisperse system,and the core particles are regular in shape with the size distribution mainly in a range of 300e400 mm.Second,in the range of evaluation pressure,sepiolitefiber,as the structure promoter,reinforces the integrity of sealing solids.Third,mussel powder,as the pore structure modifier,improves the retention ability of the sealingfluid in the limited leakage space.These two sealing materials not only cooperatively improve the structure of solid barrier,but also markedly enhance the plugging capability of composite PAS in large pores.In conclusion,these results can provide theoretical and technical support for the development and application of novel multifunctional sealants in oil&gas wells.
