岔河集油田岔15-141井组二次加密试验及效果

Secondary Infill Development Experiment on 15 - 141 Well Group in Chaheji Oilfield

岔河集油田属河流相沉积复杂断块油藏,一次加密结束后油田依然存在井间油层连通率低,油层水驱控制程度低的问题。在180～200 m的井距下能否再加密,增油效益如何必须论证,1999年进行了旨在提高油水井连通率的二次加密单井组试验,区域油层连通率提高了17.1百分点、水驱采收率大幅度提高,为岔河集油田进行二次井网加密和下步产量接替提供了科学依据。

Inter - well communication ratio and control degree of waterflooding in Chaheji oilfield, a complex fault block reservoir of fluvial facies, are still low after primary well pattern thickening. A secondary infill development experiment on a single well group aiming at increasing inter -well communication was carried out in 1999, so as to determine whether the well pattern could be thickened further at 180 to 200 well spacing and to verify the economic benefits of incremental oil. Experiment results showed that interconnecting rate of oil layers went up by 17. 1% and waterflooding recovery rate increased by a big margin.