单稳定器组合气体钻水平段轨迹控制效果分析

Trajectory control effect analysis of BHA with single stabilizer in horizontal gas drilling process

针对气体钻水平井技术存在的问题,以单稳定器钻具组合结合转盘钻进方式解决气体条件下的水平段稳斜钻进问题,结合现场试验进行理论模拟分析,为该技术的进一步研究奠定了基础。依据现场试验条件,应用纵横弯曲连续梁理论,分析了单稳定器组合气体钻水平段时,稳定器位置、稳定器直径、井眼直径以及钻压参数等对井眼钻进趋势的影响。分析表明,在气体钻井条件下,采用单稳定器钻具组合钻进水平段,稳定器位置及直径、钻压以及井眼扩大率等是影响井眼轨迹控制的敏感参数。在现有技术装备条件下,采用单稳定器钻具组合实施气体钻水平段可以实现井眼轨迹的有效控制。针对具体应用条件下的钻具组合钻进趋势模拟分析是有效应用这一技术的基础。

Based on existing technical problems in horizontal drilling with gas,single-stabilizer BHA with rotary drilling is used to solve problems of angle holding during drilling of horizontal sections with gas.Theoretical simulation analysis is conducted with locale practices,laying basis for further study on horizontal drilling with gas.According to field test conditions,the crossbar bent continuous beam theory is applied.The effect of some parameters on trajectory＇s drilling tendency is analyzed,such as the position and diameter of stabilizer,borehole diameter and WOB.The simulation result indicates that the trajectory control effect is sensitive to such parameters as the position and diameter of stabilizer,WOB and the hole enlargement ratio with the single stabilizer BHA and gas drilling in horizontal wellbore.The locale practice indicates that the application of single stabilizer BHA with gas drilling in horizontal wellbore could reach trajectory controlling aim under present technical and instrument conditions.The trajectory drilling tendency analysis focusing on actual application conditions is the basis for effectively utilizing this technology.