Abstract: The two zones of water injection after X well repair in Bozhong 25⁃1 oilfield are confronted with two major problems. First, the injection pressure difference between two layers is 18 MPa, and secondly, the application of steel wire or coiled tubing is used to replace the horizon. The operation cycle is long and the cost is high. In order to solve the above problem, a new type of non⁃throwing fishing periodic water injection technology is applied, and the underground water injection level and water injection volume are adjusted by surface hydraulic control. The optimum design of sand control pipe string and water injection pipe string is matched to replace repeated steel wire operation. The problem has been solved, which guarantees the safety of water injection operation in high pressure differential layer, and saves 100% of the time and cost of steel wire allocation.

Key words: Separate layer water injection, Periodic water injection, Flow control valve, Seal, Ground control, Field operation

摘要： 渤中25⁃1油田X井上返补孔后分两层注水，面临两大难题：首先是分层注入压力差达18 MPa，其次调换层位应用钢丝或连续油管作业周期长、费用高。为解决以上难题，应用一种新型免投捞周期性注水技术，采用地面液压控制调节井下注水层位和注水量的办法，配套防砂管柱和注水管柱优化设计，代替反复钢丝作业。问题得到解决，保障了大压差分层注水作业安全，并100％的节省钢丝调配作业时间及作业费用。

关键词: 分层注水, 周期性注水, 流量阀, 密封, 地面控制, 现场作业