福山凹陷小断块油藏储层压裂技术研究与应用

水力加砂压裂一直是各个油田增储上产的重要手段,但福山凹陷前期压裂效果不好,其原因是断块小而多、油气水关系复杂.通过对福山凹陷小断块油藏储层压裂改造的难点进行分析,采取了前置液投球+变排量控制缝高技术、人工隔层+变排量控制缝高技术、高低温2种压裂液体系优选技术、支撑剂粒径组合等针对性工艺措施,同时优化了压裂液体系和施工管...

Research and application on fracturing of small fault block reservoir in Fushan Depression

Hydraulic sand fracture has been an important means of enhanced oil recovery for all oilfields, but the fracturing effect is not satisfactory at early fracture stage in Fushan Depression. The reason is that the technology fitting for the fracturing measure of Fushan Depression is not found. Fushan Depression is famous because it has a lot of small fault blocks and a complex oil-gas-water relationship. After analyzed the difficulty of reservoir fracturing of small fault block in the depression, some targeted methods are adopted, including ahead fluid delivering ball and fracture height control with variable displacement method, artificial barrier and fracture height control with variable displacement method, optimization of the fracturing liquid systems with high temperature and low temperature, grain size combination of proppant, At the same time, fracturing liquid system and operating tool string are optimized. Field success rate and availability of fracturing test in six wells are 100%, in which Well L16-1x and Well HD4-1x have gotten high production rate. That confirms that a series of fracture techniques formed by study are equally an important way of enhanced oil recovery for Fushan Depression, which provides a reliable reference for later reservoir evaluation, selection of well and layer and selection of operation technology in Fushan Depression.