新沟嘴组深层油藏压裂优化技术研究与应用

Research and application of fracturing optimization technology for deep reservoirs in Xingouzui Formation

江陵凹陷新沟嘴组深井埋深3300~4200m,历史累计共施工10口井14井次,总体反应施工压力高,加砂窗口小,难以完成大规模加砂量,小压测试反应深井天然裂缝发育,采用双翼缝压裂试油效果差,单井累产低;特殊储层特征影响深井改造方式与之匹配性,通过对储层裂缝形态研究,开展老井压裂降压优化,结合适用于深井高温储层的低伤害压裂液体系研究,形成新沟嘴组深层直井复杂缝压裂工艺技术系列,现场增油效果明显,为实现2311万吨储量升级动用提供技术支撑。

The deep wells of Xingouzui Formation in Jiangling Depression are buried at a depth of3300-4200 m. A total of 10 wells and 14 wells have been constructed in history. The overall reaction construction pressure is high, the sanding window is small, and it is difficult to complete large-scale sand addition. Fracture development, the use of double-flank fracture fracturing test is poor, and the single well has low cumulative production;special reservoir characteristics affect the matching of deep well reconstruction methods. Through research on reservoir fracture morphology, carry out fracturing decompression optimization of old wells. It is suitable for the research of low-injury fracturing fluid system for deep well high-temperature reservoirs, forming a series of complex fracture fracturing technology series for deep vertical wells in Xingouzui Formation. The on-site oil increase effect is obvious, and it provides technical support for the realization of 23.11 million tons of reserves upgrade.