CAJ | 학술논문

为了提高在极软、极硬地层中钻井时的井眼轨迹预测与控制能力，研究了岩石力学性质对井眼轨迹的影响机理和相应的控制措施。基于纵横弯曲连续梁理论，分析了地层力学性质对下部钻具组合导向性能的影响，在此基础上，建立了考虑地层力学性质的钻头导向模型，利用钻头导向模型定量描述钻压、造斜力、地层可钻性和钻头各向异性对井眼轨迹的影响。对于φ215.9 m m井眼，井眼瞬时扩径率小于3％时，宜采用弯壳体螺杆钻具，井眼扩径率大于3％时，弯接头配合直螺杆导向能力更强；地层可钻性级值由1增大为10时，趋势角从6.00°降为1.00°。软地层和侧钻井眼推荐使用弯接头配合直螺杆钻具，硬地层推荐使用侧切能力强的钻头配合单弯螺杆钻具。
위료제고재겁연、겁경지층중찬정시적정안궤적예측여공제능력，연구료암석역학성질대정안궤적적영향궤리화상응적공제조시。기우종횡만곡련속량이론，분석료지층역학성질대하부찬구조합도향성능적영향，재차기출상，건립료고필지층역학성질적찬두도향모형，이용찬두도향모형정량묘술찬압、조사력、지층가찬성화찬두각향이성대정안궤적적영향。대우φ215.9 m m정안，정안순시확경솔소우3％시，의채용만각체라간찬구，정안확경솔대우3％시，만접두배합직라간도향능력경강；지층가찬성급치유1증대위10시，추세각종6.00°강위1.00°。연지층화측찬정안추천사용만접두배합직라간찬구，경지층추천사용측절능력강적찬두배합단만라간찬구。
To improve the prediction and control ability of well trajectory in very soft and very hard formations ,the effect of rock mechanical property on well trajectory and related control measures has been studied .According to beam theory ,the effect of rock mechanical property on bottom hole assembly (BHA) property was analyzed ,on this basis ,a bit steering model was developed considering rock mechanical prop-erties ;then the model was used to describe the effect of weight on bit ,building force ,rock drillability and bit anisotropy on well trajectory quantitatively .For φ215.9 mm well bore ,if the instant expending ratio of well bore diameter is less than 3% ,bending house PDM is suitable ,if expending ratio is more than 3% , bending sub matched with straight PDM has stronger steering ability .With rock drillability increasing from 1 to 10 ,well trajectory trending angle decreases from 6.00°to 1.00° .Bending sub matched with straight PDM is recommended for the drilling of soft formation and sidetracking .Bit with more side cutting ability matched with bending house PDM is more effective when drilling hard formations .