∅244.5 mm套管一趟管柱钻灰塞工艺技术

One-trip cement plug drilling technology in∅244.5 mm casing

为了解决冀东油田大修动力∅244.5 mm大套管钻灰塞施工成本高的问题,实现技术增效,开展了小修修井机提供动力利用螺杆钻具携带钻头一趟工序进行∅244.5 mm套管钻塞技术研究。采用外径172 mm螺杆马达携带外径214 mm钻头进行灰塞钻磨,通过向油套环空添加增黏剂,解决油套环形空间大返排灰屑困难问题;通过点焊方式解决钻具扭矩大,钻头易落井的技术难点;通过对施工工艺参数进行优化,对管柱组配进行了优选,形成了一套适用于∅244.5 mm大套管钻塞工艺。经南堡某井现场应用,解决了环空返排效率低的问题,取得了较好的应用效果。该技术节约了施工成本,降低了作业周期,为∅244.5 mm大套管小修一趟管柱钻灰塞方面提供技术支撑。

To address the high construction cost of drilling cement plugs during the overhaul of∅244.5 mm large power casing in Jidong Oilfield,and to achieve technological efficiency,a study on the technology of drilling cement plugs in∅244.5 mm casing with one trip using a screw drill bit that powered by a small workover rig was conducted.A screw motor with an outer diameter of 172 mm is used to carry a drill bit with an outer diameter of 214 mm for cement plug drilling and grinding.By adding a thickener to the annular space,the problem of large backflow of debris in the annular space was solved.The technical challenges of high torque and easy bit drop were addressed by using spot welding method.Through the optimization of construction process parameters and the selection of pipe column assemblies,a set of technology suitable for cement plug drilling in∅244.5 mm large casing was developed.Through on-site application in a well in Nanpu,the problem of low efficiency in debris return in the annular space was successfully solved,achieving good application results.This technology can save construction costs and reduce operation cycles,which will provide a technical support for cement plug drilling with one trip in∅244.5 mm large casing.