摘要
针对现有偏心分层注水工艺井下水嘴投捞成功率低、仪器与水嘴对接效率低以及分层流量测试精度低,难以满足大斜度井分注和测调需要的问题,提出了新型大斜度井同心分层注水工艺技术。该技术采用同心测调方案,测试仪器与井下配水器采用同心对接方式,大斜度井对接成功率高;井下配水器采用桥式通道设计,可以有效消除层间干扰的影响,提高测调效率;水量调节采用偏心阀设计,全关状态漏失量小,调节扭矩小,配水更加容易;测试方面兼容集流测试和非集流测试功能,满足小水量的测试需求;实现电缆在线直读验封,皮囊密封状态可监测,一次下井完成全部验封作业。测调期间可以实现任意层段分层流量、压力、温度等多个参数的在线直读测试,以及配注量的自动测调,无需投捞作业,显著提高测调效率。截至目前,现场试验11口井,最大井斜55°,流量测试误差小于5%,3层井验封和测调时间1 d以内,与现有技术相比具有测调效率高、精度高、成本低等特点。
Existing eccentric zonal water injection techniques cannot meet the requirements of separated layer water injection, testing and adjustment in highly-deviated wells, because of their low fishing success rate of down-hole nozzles, low efficiency of connection between instruments and nozzles, and low precision of zonal flow rate test. A new concentric zonal water injection technique is proposed for highly-deviated wells. This technique adopts concentric testing and adjustment, i.e., the test instrument is concentrically connected with the down-hole regulator, with high success rate of connection. The down-hole regulator uses bridge-type channel to effectively eliminate inter-layer interference and thereby improving testing and adjustment efficiency. Water flow rate is adjusted with an eccentric valve, which features small loss in full-off state, small adjustment torque and easier water adjustment. This technique is functional for both collected flow test and non-collected flow test, so it is workable for low flow rate test. It can achieve packer seal test on line by cable, the status of seal balls can be monitored and all seal test operations can be completed in one trip. This technique can obtain flow rate, pressure, temperature and other parameters of any layer on line and automatic testing and adjustment of injection allocation rate, without fishing, significantly improving testing and adjustment efficiency. Until now, this technique has been tested in 11 wells（maximum well deviation of 55°）, with tested flow rate error of less than 5%, and three-layer seal check and adjustment time of less than one day. Compared with the existing techniques, this new technique has advantages such as high testing and adjustment efficiency, high precision and low cost.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2015年第4期512-517,共6页
Petroleum Exploration and Development
基金
国家高技术研究发展计划(836计划)"采油井筒控制工程关键技术与装备"(SQ2011AAJY2935)
关键词
大斜度井
同心分层注水技术
电缆直读测调
电缆直读验封
配注量自动测调
测调效率
highly-deviated well
concentric zonal water injection
cable test and adjustment
cable seal test
automatic water allocation
testing and adjustment efficiency
