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该油田具有低渗透、低孔、层薄而多、应力敏感性强以及微裂缝发育等特点,还具有显著的双重介质储油层的特性。因为对天然裂缝的开启导致了压裂早期砂堵和压裂液过量滤失的缺陷,导致了该区油藏不能得到有效的开发。本文根据该油田勘探及开发过程中压裂改造的实践应用,利用压力降分析成果及储层裂缝开启机理,通过地应力剖面分层研究及配套射孔优化、全三维压裂模拟、暂堵、限流压裂、前置段塞以及转向控缝等工艺的实践,解决了该类型储层压裂早期砂堵的问题。现场的应用达到60井次,成功率可以达到80%以上,增产原油量5×104吨。
The oilfield is characterized by low permeability, low porosity, thin layers, strong stress sensitivity and micro-fracture development. It also has significant dual-medium reservoir properties. Because of the opening of natural fractures, the defects of early sand fracturing and excess fluid loss in fracturing fluid resulted in the failure to effectively develop the reservoirs in this area. Based on the practical application of fracturing in the process of exploration and development, this paper makes use of the pressure drop analysis results and the mechanism of reservoir fracture opening. Through the stratigraphic study of the geostress section and the matching perforation optimization, the 3D fracturing simulation, Current-limit fracturing, pre-slug and steering control of the practice of the process to solve this type of reservoir fracturing early sand blocking problem. On-site applications reached 60 wells, the success rate can reach more than 80%, an increase of 5 × 104 tons of crude oil.