套管锻铣技术在柯20井储气库建井的应用

Application of casing forging and milling technology in Well Ke-20 for gas storage well construction

摘要:

柯20井是位于柯克亚凝析气田一口储气库建井，储气层顶界以上井段固井质量不满足要求，需进行套管锻铣后重新封堵。由于该井锻铣点深、锻铣套管钢级高，现场设备施工排量和泵压不足，锻铣工具不能完全锻铣套管接箍且铣刀张力不够，给锻铣作业带来诸多困难。通过优选锻铣刀具、设计锻铣施工参数和钻井液体系、泵车配合泥浆泵增大排量、打磨锻铣刀具限位装置、分阶段调整钻井液漏斗粘度后，单趟钻锻铣进尺19.33 m，锻铣速度0.48 m/h，返屑率71%，铣刀利用率90%，相较于前几趟钻，各指标分别提高55.5%、26.3%、9.2%、26.3%，有效提高井的锻铣效率，并为其它同类型套管锻铣井的高效施工提供重要经验参考。

Abstract:

The Well Ke-20 is a gas storage well located in the Kekeya condensate gas field. The cementing quality of the well section above the top boundary of the gas reservoir does not meet the requirements， and it needs to be resealed after casing forging and milling. Due to the deep forging and milling point， the high steel grade of the forging and milling casing， the insufficient construction displacement and pump pressure of the on-site equipment， the forging and milling tools cannot completely forge and mill the casing coupling， and the milling cutter tension is not enough， it brings about many difficulties for the forging and milling operation. After optimizing the forging milling tool sellection， designing the forging and milling construction parameters and drilling fluid system， increasing the displacement of the pump truck with the mud pump， polishing the forging and milling tool inhibiting device， and adjusting the viscosity of the drilling fluid funnel in stages， the forging and milling footage in a single drilling trip is 19.33m， the forging and milling speed is 0.48m/h， the cutting return rate is 71%， and the milling tool utilization rate is 90%. Compared with the previous drilling trips， the indicators mentioned above are increased by 55.5%， 26.3%， 9.2% and 26.3% respectively， and the forging and milling efficiency is improved effectively. Which provides an important experience reference for the efficient construction of other similar casing forging and milling wells.