南海西部油田测调一体注水工艺研究及应用

Study and Application of Integrated Water Injection Technology in Oilfield of South China Sea

注水是保持油层压力、实现油田高产稳产和改善油田开发效果的有效方法。针对南海西部油田分层注水现状和需求,提出测调一体分层注水工艺。该工艺测调工作筒内部装有可调水嘴,可实现无级调节;机电一体化验封仪1次入井可实现所有层位验封,操作简单;可定位测调仪可实现在地面直读调节流量,1次入井完成所有层的调配。W23井矿场试验结果表明:该工艺的测调工作筒内部装有可调水嘴,可以实现无级调节,可定位测调仪可实现与工作筒同心对接,可以满足海上油田人工井底4 212.8 m、最大井斜65.4°大斜度深井分层注水需求,可使4层的单井测调时间由7 d缩短为8 h。同时,该工艺也存在验封仪密封皮碗设计不太合理及测调仪电机扭矩相对较小等缺点,改进后具有较好的应用前景,对后续海上油田类似注水井分层注水调配具有重要的指导意义。

Aiming at the present situation and demand of separate layer water injection in the western oilfield in the South China Sea,the integrated measurement and adjustment separate layer water injection technology has been put forward. The integrated measurement and adjustment cylinder is equipped with adjustable nozzle inside to allow stepless adjustment. Mechanical and electrical integration sealing check instrument can achieve all layers sealing inspection in one run with simple operation. The measurement and adjustment device that could be positioned can achieve flow rate reading on the ground and complete the water adjustment of all layers in one run. The field results of Well W23 show that the developed technology can meet the requirement of separate layer water injection in highly deviated deep offshore well with the artificial well bottom depth of 4 212. 8 m and the maximum well deviation of 65. 4°,which can shorten the single well measurement and adjustment time of 4 layers from 7 d to 8 h.At the same time,the technology has the disadvantages of the irrational design of the sealing bowl for sealing inspection and low torque of the measurement and adjustment tool. The developed tool would has a good application prospect after improvement,which has important guiding significance for separate layer water injection in similar well in offshore oilfield.