一趟钻技术在涪陵焦石坝页岩气区块瘦身井的提速增效应用

One-trip drilling technology applied to speed up and improve efficiency in slim-hole wells in the Jiaoshiba shale gas block of Fuling

摘要:

瘦身型水平井采用非标尺寸的井身结构，钻井提速增效面临较大挑战。为此，在涪陵页岩气田焦石坝区块地层岩石力学与可钻性的基础上，结合水平井的井身结构与轨道设计方案要求，基于“高效PDC钻头+单弯螺杆+MWD/LWD”常规导向方式，对常规页岩气水平井的关键钻井工具进行优化与迭代升级，完善了“一趟钻”工具配套，形成了瘦身型水平井的“122”（一开1趟钻、二开2趟钻、三开2趟钻）全井高效钻头、螺杆钻具一体化技术解决方案。一趟钻技术在焦石坝区块39口瘦身型水平井推广应用，15口井成功实现“122”目标，提速增效效果明显，为页岩气田老区高效开发提供了技术支撑和保障，为其他页岩油气、致密油气田的钻井提速增效提供了借鉴。

Abstract:

The slim-hole horizontal well adopts a non-standard size wellbore structure， which poses significant challenges in improving ROP and efficiency during drilling. Therefore， based on the rock mechanics and drillability of the Jiaoshiba block formation， combined with the requirements of the wellbore structure and wellbore trajectory design of the horizontal well， and based on the conventional guidance method of “efficient PDC +PDM +MWD/LWD”， the key drilling tools for the development of conventional shale gas horizontal wells were optimized and iteratively upgraded， and the “one-trip drilling” tool assembly was improved， formed a “122” （1 trip drilling for the first section， 2 trips drilling for the second， and 2 trips drilling for the third） integrated technical solution of efficient drill bits and PDM tools for slim-hole horizontal wells. The one-trip drilling technology for horizontal wells has been promoted and applied in 39 slim-hole horizontal wells in the Jiaoshiba block. 15 wells have successfully achieved the “122” goal， with significant results in ROP and efficiency improvement. This provides technical support and guarantee for the efficient development of shale gas fields in old blocks， and serves as a reference for ROP and efficiency improvement in other shale oil and gas and tight oil and gas fields.