大庆油田缆控智能分注技术工艺优化

缆控智能分注工艺实现了井下参数的连续监测和实时测调，为油藏分析提供充足数据，但由于井下工具涉及多学科应用且工艺复杂，前期现场试验过程中发现，缆控智能分注井运行2年以上井数占比仅为51.9%，无法满足规模应用需求。通过对前期试验井进行故障分析，找到影响工艺可靠性的关键因素，针对主要问题对缆控智能配水器流量控制阀、电缆密封连接工艺以及过电缆封隔器洗井阀结构进行了改进和优化；实现了缆控智能配水器流量控制阀10 MPa压差下顺利开关，漏失量小于1 m3/d；电缆与缆控智能配水器连接密封可靠，电缆可从过电缆封隔器上、下接头顺利穿过。工艺技术优化与完善后截至2022年4月，现场试验223口井，运行2年以上井数占比由原来的56.1%提高到91.9%。优化后的缆控智能分注工艺，可靠性得到提升，为该技术在油田开展规模化应用奠定基础。

Optimization of cable-controlled intelligent separate-layer water injection technology in Daqing Oilfield

The cable-controlled intelligent separate-layer water injection technology realizes the continuous monitoring and real-time measurement and adjustment of downhole parameters, and provides sufficient data for reservoir analysis. However, due to the application of multidisciplinary downhole tools and the complexity of the technology, it is found in the previous field test that the number of wells with cable-controlled intelligent separate-layer water injection wells operating for more than 2 years accounts for only 51.9% of the total, which cannot meet the requirement of large-scale application. Through the fault analysis of the previous test wells, this paper finds the key factors affecting the process reliability. To solve the main affecting issues found in the fault analysis, the flow control valve of the cable-controlled intelligent water distributor, the cable sealing connection process and the structure of the well-flushing valve of cable-through packer are improved and optimized, and the smooth opening and closing of the flow control valve of the cable controlled intelligent water distributor under the pressure difference of 10 MPa is realized, with the leakage less than 1 m3/d. The connection between the cable and the cable-controlled intelligent water distributor is reliable, and the cable can be feed through smoothly through the upper and lower connectors of the cable-through packer. After the optimization and improvement, by April 2022, this technology has gone through field tests in 223 wells, and the proportion of wells running smoothly for more than 2 years increased from 56.1% to 91.9%.After optimization, the reliability of the cable-controlled intelligent separate-layer water injection process has been improved, laying a foundation for large-scale application of the technology in oilfields.