渤海油田液压控制智能分注优化关键技术

针对渤海油田常规液压控制智能分层注水技术调配精度低、分注层数少、不能满足小眼井应用需求和无法实时监测井下注水情况等问题,开展了数字解码器研制、井下流量控制阀调节级数优化、配套大排量涡街流量计和分层调配方案设计等技术研究,形成了渤海油田液压控制智能分注优化关键技术.优化后,最大分注层数达到6层,不同规格流量控制阀的调节级...

Key Optimization Technologies of Intelligent Layered Water Injection with Hydraulic Control in Bohai Oilfield

Conventional intelligent layered water injection systems with hydraulic control in Bohai Oilfield are exposed to problems including low accuracy of allocation, limited layers, failures to meet the application requirement of slim holes and inability of downhole water injection data collection in real time. To solve these problems, research was carried out on the development of digital decoders, stage adjustment optimization of downhole flow control valves, and the design of vortex-shedding flowmeters for high flow rate and layered allocation schemes. In this way, key optimization technologies of intelligent layered water injection with hydraulic control in Bohai Oilfield were formed. After the optimization, six layers could be achieved at the most, and the stages of different flow control valves were raised to 11 and 7 stages, respectively. This means that the requirement of injection wells with 82.6 mm slim holes could be meet, and the real-time monitoring of downhole data could be achieved on the surface. Furthermore, these technologies have been applied to 20 wells in Bohai Oilfield with stable and sound system operation. Good application results can be seen in the following aspects: flexible water choke adjustment, efficient downhole data upload, high test accuracy over 95%, and short average allocation cycle of a single well within a day. The application results show that the technologies can increase the number of injection layers, realizing layered water injection for slim holes and real-time monitoring of downhole injection.