高效桥塞堵漏技术在川西马井构造的应用

川西马井构造上部地层裂隙发育,地层承压能力低,布井密集,钻井时易与邻井气层窜通,发生漏失,甚至造成复杂型井漏。虽然常规桥塞堵漏亦能堵漏成功,但由于地层承压能力低而易发生复漏和反吐,堵漏一次成功率低。为提高堵漏效果和一次成功率,在原有堵漏技术的基础上,引入高效堵漏剂,通过室内配方优化及施工工艺完善,形成了高效桥塞堵漏技术。现场试验表明该技术堵漏一次成功率高,堵漏效果良好,为低承压力地层、易漏失层以及易与邻井气层窜通等造成的复杂型井漏提供了新的堵漏思路,对解决其它复杂井漏也具有一定的指导意义。

Application of Efficient Bridge Plug Technology in Majing Structure of Western Sichuan

Because of fracture development in upper layer of Majing structure in Western Sichuan with low formation bearing capacity and dense well spacing, channeling with adjacent wells is easily occur in drilling process and lost circulation is often encountered, even leading to complex loss circulation. Although conventional bridge plug can be effectively used, the repeated leakage and flowing backward frequently occur for the poor formation bearing capacity with low one time success rate. In order to improve plugging effect and one time success rate, on the basis of the original plugging technology, efficient plugging agent was introduced, through the formula optimization in laborotory and construction process improvement, efficient bridge plug technology has been formed. The field test shows that the technology has high one time success rate and good plugging effect, which provides a new method to solve the above mentioned complex lost circulation and has certain guiding significance for dealing with complex lost circulation.