石油工业技术监督

割套技术是油田弃置井处置和大电泵试水作业的关键施工工艺，通常由大修动力完成，现有的小修割套技术由于井口驱动装置提供扭矩不足以及割套工艺的局限性，通常需要多次切割来完成设计深度。针对冀东油田大修作业动力紧缺等实际情况，研究小修割套技术，从套管切割原理、技术难点、工具研发、工艺流程及施工质量控制等方面进行深入研究，结合小型电驱钻台现场试验，对其输出扭矩及安全稳定性进行评价，并以139.7 mm(5 1/2″)套管为例，进行不同转速条件下现场割套实验，并对数据进行统计分析，优化了施工参数。目前小修割套工艺技术已达到完全自主且安全、高效的水平，取得了良好的应用效果。

The casing cutting technology is a key construction technique for the disposal of abandoned wells in oil fields and the water testing operation of large electric pumps, usually accomplished by major overhaul power. The existing minor repair cutting sleeve technology often requires multiple cuts to reach the designed depth due to insufficient torque provided by the wellhead drive device and the limitations of the slotting process. In view of the actual situation where there is a shortage of power for the major maintenance operations in the Jidong Oilfield, the technology of small-scale well repair and casing cutting was studied. An in-depth study was conducted from aspects such as the principle of casing cutting, technical difficulties, tool development, process flow and construction quality control. Combined with the on-site test of the small electric drive drilling platform, the output torque and safety stability were evaluated. With the 139.7 mm(5 1/2") casing as an example, on-site casing cutting experiments under different rotational speeds were conducted. The construction parameters were optimized by statistical analysis of the data. At present, the small repair sleeve cutting process technology has reached a level of complete autonomy, safety and efficiency, and has achieved excellent application results.