CAJ | 학술논문

多分支水平井因能够有效提高煤层气产能而成为煤层气开采的主要井型，但由于技术和经验不足，在钻井施工过程中，钻速慢、井下复杂情况时有发生。文中分析了多分支水平井在各个阶段的轨迹控制难点，并探讨了悬空侧钻、老眼重入等技术难点及控制要点，给出了造斜段轨道设计运算过程，通过合理选择随钻测量系统，精确控制了钻井全过程轨迹参数。该井眼轨迹的精确控制为我国煤层气多分支水平井整套工艺的施工提供可靠的技术借鉴和准确的参考数据。
다분지수평정인능구유효제고매층기산능이성위매층기개채적주요정형，단유우기술화경험불족，재찬정시공과정중，찬속만、정하복잡정황시유발생。문중분석료다분지수평정재각개계단적궤적공제난점，병탐토료현공측찬、로안중입등기술난점급공제요점，급출료조사단궤도설계운산과정，통과합리선택수찬측량계통，정학공제료찬정전과정궤적삼수。해정안궤적적정학공제위아국매층기다분지수평정정투공예적시공제공가고적기술차감화준학적삼고수거。
In recent years, multi-branch horizontal well has become the most important well type for coal bed methane(CBM) development because it can effectively enhance CBM production. But lacking skill and experience often cause slow drilling, sticking accidents, and other complex situations underground. The paper makes a comprehensive analysis on the trajectory control dififculties at each stage of multi-branch horizontal well drilling, and gives build-up section track design operation process. Through selecting a reasonable MWD system, the trajectory parameters of the whole drilling process is precisely controlled. The article also explores pend-ing sidetracking, old well bores reentrant technical dififculties and control points. It provides reliable technical reference and accurate referencing data for drilling coalbed methane multi-branch horizontal wells.