提高油气田采收率技术协同方法与应用

Technological synergy for enhancing hydrocarbon recovery and its applications

阐述了提高油气采收率技术协同方法的内涵,研究形成了“3+2”(三次采油和二次采油)协同大幅度提高高含水老油田采收率技术,提出了“3+2”提高采收率技术政策。建立了多元热复合技术协同大幅度提高稠油采收率方法,研究提出的提高油气田采收率技术协同方法在矿场应用,难开采稠油采收率提高了21.9%。多元热复合开发与分支井技术协同应用成功将稠油黏度动用上限扩展到750000 mPa·s,储层厚度动用下限突破到1.5 m。提出了下一步技术协同发展方向:低渗透油藏压驱-注水协同开发、缝洞型油藏气-水-井网协同提高采收率、老油田油藏-井筒-地面一体化开采以及页岩气复合排水采气。

This study introduces the connotation of technological synergy for enhancing hydrocarbon recovery,and proposes the synergy of secondary recovery(water flooding)with tertiary recovery(CO2 flooding)(also referred to as the synergy of 3+2)to significantly improve the recovery of mature fields with high water cut,as well as corresponding measures taken to facilitate the technological synergy execution.What’s more,the synergy of thermal fluids with multiple displacing mediums is also established to substantially improve heavy oil recovery,and is applied in practice,showing a 21.9%increase in the recovery for heavy oils that are typically difficult to extract.Furthermore,the synergy of multi-displacing-mediums compounded thermal flooding with multilateral wells is successfully applied to expand the upper limit of the viscosity for heavy oil recovery to 750,000 mPa·s and reduced the lower limit of the produced reservoir thickness to 1.5 m.Future research on the synergy alternatives for enhancing hydrocarbon recovery should focus on the synergy of hydraulic fracturing-assisted oil displacement with waterflooding for low-permeability reservoirs,the synergy of gas flooding,water flooding,and injection-production well pattern optimization for fractured-vuggy oil reservoirs,the synergy of injection-production ratio optimization,artificial lift and gathering system for mature oilfields,as well as combined drainage gas recovery for shale gas.