低渗透油藏RPM控水压裂液性能评价与应用
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摘要
以阴、阳离子聚电解质为原料,应用溶液共混法制备了RPM(Relative Permeability Modifiers)控水压裂液,评价了RPM溶液吸附、抗剪切及耐冲刷性能,并以油水相对渗透率为指标考察了RPM压裂液控水效果并分析其控水机理。考虑RPM吸附、滤失等因素,建立了低渗油藏RPM压裂液性能及注入参数优化模型。以长庆油田一口油井为例,综合考虑作业成本、产油量与含水率等因素,应用正交设计与数值模拟方法优化RPM控水压裂液的油水残余阻力系数比、滤失深度比及注入体积并进行了敏感性分析。结果表明:RPM控水压裂液具有良好的抗剪切耐冲刷性能,通过物理化学吸附改变了岩石孔隙或微裂缝中油水渗流特性,尤其在高含水饱和度阶段可降低水相相对渗透率80%以上;RPM控水压裂液的油水残余阻力系数比、滤失深度比以及注入体积分别在2~6、0.3~0.6与20~30 m3范围内控水稳油效果明显;选择油水残余阻力系数比为5.0、滤失深度比为0.6的RPM控水压裂液在长庆油田高含水储层先导试验4井次,单井平均增油4.64t/d,含水率平均下降58.51%。
Using anionic,cationic polyelectrolyte as raw materials,the relative permeability modifier( RPM) water control fracturing fluid was prepared by solution blending method and its performances such as adsorption,shear resistance and erosion resistance are evaluated. The water control effect of RPM fracturing fluid was investigated using oil- water relative permeability as performance index and its water control mechanism was analyzed. An optimization model of the performance and injection parameters of RPM fracturing fluid for low permeability reservoir was established,in which the factors such as the adsorption of RPM,filtration,etc. are considered. Taking an oil well in Changqing Oilfield as an example,the main parameters( oil- water residual resistance factor ratio,filtration depth ratio and injection volume) of RPM fracturing fluid are optimized by numerical simulation and orthogonal design under comprehensively considering operating cost,oil production and water cut,and their sensitivities are also analyzed. The results show that RPM solution possesses good shear resistance and erosion resistance,which changes the flow performance of oil and water in rock pores or micro-fractures by physical and chemical adsorption and decreases the relative permeability of water by over 80% in high water saturation stage. And the water- control effect of RPM fracturing fluid is good when oil- water residual resistance factor ratio is 2 ~ 6,filtration depth ratio is 0. 3 ~ 0. 6 and injection volume is 20 ~ 30 m3. The pilot tests of RPM fracturing fluid with oil- water residual resistance factor ratio 5. 0 and filtration depth ratio 0. 6 were implemented on four oil wells,the average daily oil production of single well is increased by 4. 64 t,and their water cut is averagely decreased by 58. 51%.
Using anionic,cationic polyelectrolyte as raw materials,the relative permeability modifier( RPM) water control fracturing fluid was prepared by solution blending method and its performances such as adsorption,shear resistance and erosion resistance are evaluated. The water control effect of RPM fracturing fluid was investigated using oil- water relative permeability as performance index and its water control mechanism was analyzed. An optimization model of the performance and injection parameters of RPM fracturing fluid for low permeability reservoir was established,in which the factors such as the adsorption of RPM,filtration,etc. are considered. Taking an oil well in Changqing Oilfield as an example,the main parameters( oil- water residual resistance factor ratio,filtration depth ratio and injection volume) of RPM fracturing fluid are optimized by numerical simulation and orthogonal design under comprehensively considering operating cost,oil production and water cut,and their sensitivities are also analyzed. The results show that RPM solution possesses good shear resistance and erosion resistance,which changes the flow performance of oil and water in rock pores or micro-fractures by physical and chemical adsorption and decreases the relative permeability of water by over 80% in high water saturation stage. And the water- control effect of RPM fracturing fluid is good when oil- water residual resistance factor ratio is 2 ~ 6,filtration depth ratio is 0. 3 ~ 0. 6 and injection volume is 20 ~ 30 m3. The pilot tests of RPM fracturing fluid with oil- water residual resistance factor ratio 5. 0 and filtration depth ratio 0. 6 were implemented on four oil wells,the average daily oil production of single well is increased by 4. 64 t,and their water cut is averagely decreased by 58. 51%.
引文
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[13]R S Seright,J Liang,Mailin Seldal.Sizing gelant treatments in hydraulically fractured production wells[J].SPE Production&Facilities,1998,13(4):223-229.
[14]S Yuan,H Dong,W Qiang,et al.Numerical simulator for the combination process of profile control and polymer flooding[C].SPE International Oil and Gas Conference and Exhibition in China,2000.
[15]R S Seright.Gel propagation through fratures[C].SPE/DOE Improved Oil Recovery Symposium,2000.
[16]刘亚平,陈月明,李春英,等.利用多层次模糊综合评判方法定量预测特高含水期油藏潜力[J].系统工程理论与实践,2009,29(1):181-185.LIU Yaping,CHEN Yueming,LI Chunying,et al.Determining the development potential of reservoirs at ultra-high water cut stage using comprehensive fuzzy analytical hierarchy evaluation method[J].Systems EngineeringTheory&Practice,2009,29(1):181-185.
[2]BORODIN E G,VAKHROUSHEV P E,S M Stolyarov,et al.Application of relative permeability modifiers to control water cut following hydraulic fracturing in western Siberia oilfields—Russian case history study[J].SPE Production&Operations,2006,23(3):411-418
[3]Len Fry,Don Everett,Mark Moody,et al.Successful application of relative-permeability modifiers to control water production in Rose Run fracturing[C].SPE Eastern Regional Meeting,2006.
[4]LEAL J,GONZALEZ M A,HOCOL S A,et al.Unconventional RPM applications in hydraulic fracturing[C].SPE Annual Technical Conference and Exhibition,2005.
[5]EOFF Larry,DALRYMPLE Dwyann,REDDY B R,et al.Development of a hydrophobically modified water-soluble polymer as a selective bullhead system for water-production problems[C].SPE International Symposium on Oilfield Chemistry,2003.
[6]NELSON Scott G,KALFAYAN Leonard J,RITTENBERRY William M,et al.The application of a new and unique relative permeability modifier in selectively reducing water production[C].SPE Annual Technical Conference and Exhibition,2003.
[7]邱晓惠,张汝生,杨振周,等.相渗透率改进剂FA-RPM的室内研究[J].石油钻探技术,2007,35(1):63-65.QIU Xiaohui,ZHANG Rusheng,YANG Zhenzhou,et al.Lab study on FA-RPM:a phase permeability modifier[J].Petroleum Drilling Techniques,2007,35(1):63-65.
[8]刘建新,张营华,任韶然.新型相对渗透率改善剂控水性能试验研究[J].石油天然气学报,2008,30(5):140-142.LIU Jianxin,ZHANG Yinghua,REN Shaoran.Laboratory study on new relative permeability modifier for water control[J].Journal of Oil and Gas Technology,2008,30(5):140-142.
[9]Nicholas Kume.An engineering approach to predicting post-treatment well performance using selective chemical water shutoff techniques:An RPM example[C].SPE Annual Technical Conference and Exhibition,2003.
[10]O Vazquez,M Singleton,K S Sorbie,et al.Sensitivity study on the main factors affecting a polymeric RPM treatment in the near-wellbore region of a mature oil-producing well[C].SPE International Symposium on Oilfield Chemistry,2007.
[11]温庆志,蒲春生,曲占庆,等.低渗透、特低渗透油藏非达西渗流整体压裂优化设计[J].油气地质与采收率,2009,16(6):102-104WEN Qingzhi,PU Chunsheng,QU Zhanqing,et al.Integral fracturing optimization design of non-Darcy flows low and ultra-low permeability oil reservoirs[J].Petroleum Geology and Recovery Efficiency,2009,16(6):102-104
[12]温庆志,张士诚.改进的水平缝四点井网整体压裂数值模拟[J].中国石油大学学报(自然科学版),2005,29(6):57-60.WEN Qingzhi,ZHANG Shicheng.Improved integral fracturing numerical simulation for four-spot pattern with horizontal fractures[J].Journal of China University of Petroleum,2005,29(6):57-60.
[13]R S Seright,J Liang,Mailin Seldal.Sizing gelant treatments in hydraulically fractured production wells[J].SPE Production&Facilities,1998,13(4):223-229.
[14]S Yuan,H Dong,W Qiang,et al.Numerical simulator for the combination process of profile control and polymer flooding[C].SPE International Oil and Gas Conference and Exhibition in China,2000.
[15]R S Seright.Gel propagation through fratures[C].SPE/DOE Improved Oil Recovery Symposium,2000.
[16]刘亚平,陈月明,李春英,等.利用多层次模糊综合评判方法定量预测特高含水期油藏潜力[J].系统工程理论与实践,2009,29(1):181-185.LIU Yaping,CHEN Yueming,LI Chunying,et al.Determining the development potential of reservoirs at ultra-high water cut stage using comprehensive fuzzy analytical hierarchy evaluation method[J].Systems EngineeringTheory&Practice,2009,29(1):181-185.