明一西区块油藏深部调剖/微生物驱矿场试验

Field Trial of Indepth Profile Control and Microbe Flood in Combination at Blocked Oil Reservoir WM-1

中原油田明一西块油藏温度80℃,综合含水已达85.53%,产量递减偏大。通过室内模拟实验,确定了该油藏深部调剖/微生物驱注入段塞如下:①延迟交联的0.6-0.8 g/L聚合物有机凝胶,预处理段塞;②粒径6-12mm、浓度5-10 g/L的预交联凝胶颗粒悬浮液,延迟交联的1-1.5 g/L聚合物有机凝胶,二者交替注入,为复合调剖段塞;③清水段塞;④组合菌菌数>108个/mL的菌液1%稀释液,微生物段塞,段塞尺寸0.02-0.15 PV。用长1.8 m的3支长填砂管在80℃进行微生物驱油,注入0.2 PV菌液,在水驱基础上分别提高采收率12.1%、8.2%、13.3%。2005年6月在2个井组,2005年10月在3个井组,开始实施深部调剖/微生物驱联合试验,4个段塞尺寸(m3)分别为200、1500-2000,800,3100-3800,复合调剖段塞中凝胶颗粒与聚合物凝胶体积比为2∶3,交替3-4次,17口对应油井中有12口见效,平均单井日产油量由3.2 t升至7.5 t,平均含水由84.6%降至73.6%,截止2006-02-12,单井平均累计增产油199.7 t。表4参4。

Blocked oil reservoir WM-1 in Zhongyuan is characterized by formation temperature 80℃,composite water cut 85.53%,and rather a large exponential decline of oil production.Through laboratory simulation experiments the slug structure for a combinational indepth profiling/microbe flooding project in the reservoir is established: ①0.6—0.8 g/L polymer/organics gelling fluid of delayed crosslinking as pretreating slug;② 5—10 g/L suspension of precrosslinked gel particles(PCGPs) of size 6—12 mm and 1—1.5 g/L polyme...