HYS油田复合热载体驱油先导试验

Pilot Test for Oil Displacement with Combined Heat Carrier in HYS Oilfield

HYS油田是国内最早进行热采的超浅层稠油区块,但是常规热采技术开发超浅层稠油难度大,为提高原油采收率,开展了复合热载体试验。第一批试验井主要依靠复合热载体,辅以少量蒸汽,驱油效果差;第二批试验井综合应用了复合热载体、蒸汽和发泡剂,驱油效果较好。试验结果表明,复合热载体主要为非凝结气体,本身焓值低,需要蒸汽辅助方能起作用。组合注汽可以防止汽窜、形成规模效应,是复合热载体的最佳注汽方式,并在HYS油田克上组油藏取得了比较好的驱油效果。先导试验结果表明,复合热载体技术可以改善超浅层稠油驱油效果,提高采收率,可进行现场应用试验。

HYS Oilfield is the first area of thermal recovery for heavy oil in ultra-shallow formations in China,but it is hard to develop heavy oil from ultra-shallow reservoir by conventional thermal recovery. In order to enhance recovery, experiment of combined thermal carriers has been carried out. The first sets of tests are made by combined heat carrier and a small amount of steam,the effect is poor in displacement of oil;the second sets of tests are made by combined heat carrier, steam and foamer,with better results obtained. The testing results show that combined thermal carrier is mainly non-condensed gas, with low enthalpy value,requiring the assistance of steam to work well. Combined steam injection can prevent steam channeling, and produce scale effect, that is the best method of steam injection by combined heat carrier, and has obtained good effect in T2 k formation of HYS Oilfield. Combined heat carrier technique can improve heavy oil displacement effect in ultra-shallow formations, enhance oil recovery, and provide guidance for its application in the future.