裂隙性储层堵漏剂配方优选实验

Laboratory Study on Optimization of Lost Circulation Particals for Fractured Formation.

裂隙性漏失及其引起的储层损害问题严重制约着裂隙性油气藏和深层油气藏的钻探及开发进程。应用正交实验法对6种不同粒度、不同硬度的桥堵剂设计了16种配方,使用DL-A型高温高压堵漏模拟试验装置,以漏失量、承受压力和堵漏时间为评价指标,测量了不同配方堵漏剂对4mm圆孔模板及长孔模板的堵漏效果,并得出了最优配方。最优配方堵漏剂对模拟孔、缝的试件具有高的承压能力、较短的漏失时间和较低的漏失量,堵漏效果比较明显。分析实验结果可以得出,在裂缝性漏失地层中应适当加大硫矿粉、核桃壳等能够在井内温度下遇水膨胀的材料,而在孔隙性漏失地层中应适当减少其加量,而应加大花生壳、锯末等纤维状材料。

Fractured reservoir leakage and its damage restricted the process of the drilling and development of fractured reservoirs and deep reservoirs.Four-millimeter cracks and pore formation module were used to simulate the complex circumstances of the formation by DL-A plugging instrument to measure loss of volume,bearing pressure and plugging time.The experimental results showed that the propotion of the plugging particles in the formula three and formula eight match four-millimeter cracks and pores.At room temperature,plugging particles played an effective role in bridge plugging for simulation holes and cracks of the specimen.Then,the leakage of temporary plugging was solved for the fractured and cave formation.