化学与机械联合堵水技术在涠洲11-4油田的应用

为了提高油田的开采效果,减缓平台的污水处理压力,对涠洲11-4油田开展了堵水技术研究。该油田油井大部分采用砾石充填筛管完井方式,砾石充填处产层上下连通,堵水难度较大。通过对油田油水分布的研究,结合以往该油田堵水的经验,最终确定在A15井开展化学与机械联合堵水的方案。通过在A15井下入带有封隔器的堵水管柱,在筛管内封隔上部未水淹层,从环空注入暂堵剂,在地层中形成隔板,在筛管外保护上部未水淹层,然后从堵水管柱中注入堵剂,堵后堵水管柱脱手留在井下,实现化学与机械联合堵水。现场实施后,含水下降25%,累计增油1233 m3,减少污水处理量9×104 m3。该技术的成功应用表明在一定地质条件下,底水整体托进且采用砾石充填完井的油井中,采用机械与化学联合堵水的方式是可行的,为类似油田提高采收率提供了一条新思路。

Application of Jointly chemical and mechanical water plugging technology in WZ11-4 oilfield

A research of water plugging for WZ11-4 oil field was developed in order to enhance the recovery efficiency and ease the platform backwater treatment.It is hard to plug water for the seesaw connection of the high level caused by gravel pack and screen completion.By studying field water distribution as well as water plugging experience of this field,a scheme to implement jointly chemical and mechanical water plugging in A15 well was proposed.This technique is to trip in blocking column and pack-off the upper zone unflooded.Then temporary blocking agent was injected through annular and separating board formed to protect the reservoir outside the screen.After that,blocking agent was filled in through blocking column,and the column was then left in the well to jointly plug water.The water cut decreased 25% but the oil stimulated for 1233 m3 totally after implementation.At same time,waste water disposal load was diminished for 9×104 m3.The successful application of this technique demonstrates that the jointly chemical and mechanical water plugging technology is advisable for bottom water bulk impulse reservoir and gravel pack completion wells to certain geological settings.It provides a totally new way of recovery enhancement for similar oil fields.