AN井区长7致密油藏裂缝特征及开发对策  

Study on fracture features and development measures of tight Chang7 oil reservoirs in the AN well block

作　　者：申利娜[1] 路向伟[2] 乔华伟[3] 梁益财 魏忠元[1] 

机构地区：[1]中国石油长庆油田分公司勘探开发研究院 [2]中国石油长庆油田分公司第六采油厂 [3]中国石油长庆油田分公司第三采油厂 [4]中国石油长庆油田分公司第九采油厂

出　　处：《低渗透油气田》2016年第2期76-81,共6页

摘　　要：针对致密油藏裂缝发育，长期注水不见效，压力系统难以建立，产量递减很快的问题，从静态和动态两个方面。通过岩心观察、井间示踪剂测试、水驱前缘等裂缝动态监测方法对裂缝特征进行分析。结果表明，AN井区致密储层中裂缝主要为高角度缝，裂缝走向北东75°～85°，倾角70°～85°。由于微裂缝的发育，注入水沿裂缝流动．导致油井见水早，产能下降快。因此，以裂缝描述为基础，从定向井和水平井两个方面制定致密油的开发技术政策，同时考虑了启动压力梯度影响，合理优化了注采参数。实践证明，经过措施改造，油井平均单并日增油0．5t，说明致密油藏通过深化地质认识和措施调整，可以取得一定成效，对长庆致密油藏的开发具有很好的借鉴意义。In view of problems such as the fractures developed, long-term no response of water injection, being difficult to establish the pressure system, and quick decline of the production rate of the tight oil reservoirs, proceeding from two aspects of static and dynamic, the characteristics of fractures are analyzed by using performance monitoring methods of the core observation, interwell tracer test, and water-flooding front. The results show that the fractures in tight reservoirs of AN well area is mainly high angle fractures, and the fracture trend is 75 to 85 degrees northeast, with the dip angle is 70 to 85 degrees. Due to the development of micro crevices, the injected water flows along the crevices, leading to the early water-breakthrough of the oil wells, and fast decline of the production capacity. Therefore, based on the fracture description, the development technology policy of tight oil is formulated from two aspects： the directional wells and horizontal wells. Moreover, with consideration of the influence of starting pressure gradient, injection- production parameters are optimized reasonably. Practice shows that, through the stimulation, the average production increase of individual oil well is 0. 5 t/d. This illustrates that certain fruits can be achieved on the tight reservoirs through deepening the geological understanding and adjustment measures. It has very good reference significance to development of tight reservoirs in Changqing Oilfield.

关 键 词：致密油 裂缝 开发对策 

分 类 号：TE357.8[石油与天然气工程—油气田开发工程]