解水锁技术在超低渗油藏分段压裂水平井中的应用

Application of water-unblocking technology in staged fracturing horizontal wells of untra-low permeability reservoir

针对红河油田开发储层具有低孔、低渗、低压、天然裂缝较发育的特征,以及在钻井、压裂及作业过程中容易受到水锁伤害的难题,文中分析了红河油田水平井水锁伤害机理,并结合实验室分析结果,优选解水锁处理剂,在红河油田选择部分压窜水平井进行了解水锁试验。现场试验表明,解水锁措施后产量恢复明显,说明在红河油田部分压窜水平井确实存在水锁效应,并在一定程度上能解除这种储层伤害。解水锁措施对红河油田压窜水平井的产量恢复意义重大。

As the main development reservoir of Honghe Oilfield is characterized by low porosity, low permeability, low pressure and well developed natural fractures, it is easy to be damaged by water blocking during drilling, fracturing and other treatments. This paper analyzed the mechanism of damage caused by water blocking to oil wells in Honghe Oilfield. Combined with laboratory experiments. the preferred water-unblocking treatment agents are applied to some fracturing channeling horizontal wells in Honghe Oilfield for water-unblocking test. Field tests show that after water-unblocking, the production recover＇：＇ of fracturing channeling horizontal wells is obvious, which indicates water-blocking effect does exist in some fracturing channeling horizontal wells and can be relieved to some extent. Water-unblocking measures have important significance for the production recovery of fracturing channeling horizontal wells.