复杂断块油藏CO_2吞吐参数的优化及矿场试验

Parameter optimization and field test of CO_2 huff and puff of complex fault reservoir

CO_2吞吐是提高油井产量和采收率的有效措施。采用油藏工程综合评价方法,优选出CO_2注入量、注入速度、浸泡时间和放喷速度等吞吐参数,并在苏北油田开展了现场试验,平均换油率达到1.01 t(油)/t(CO_2),相比于前期吞吐井的换油率提高了94%。试验结果表明,CO_2吞吐只要方法得当、参数合理,具有投资少、见效快等特点,值得在低产低效油井中大力推广。

CO_2huff and puff is an effective measure of improving well production and recovery efficiency. By the comprehensive evaluation method of reservoir engineering, the huff and puff parameters such as the CO_2 injection volume, injection rate, soak time and blowout rate are optimized. The field tests are carried out in Subei oilfield. The oil draining rate reaches 1.01 t（oil）/t（CO_2）.Compared with that in the earlier stage, it increases by 94 %. The test results show that the CO_2 huff and puff with suitable method and reasonable parameters has the characteristics of less investment and quick effect, which deserved to be popularized in the low production and inefficient oil wells.