CAJ | 학술논문

长庆油田受地形地貌影响,经常需要进行三维水平井施工.对于靶前距不长的中半径水平井,较大的偏移距给钻井施工带来风险.为减少这种施工风险,通过对长庆油田环平3水平井的研究,分析三维水平井轨迹控制特征,改变只在斜井段进行轨迹控制的传统模式,在直井段使用适当的钻具结构进行三维轨迹控制,使在井斜角很小时完成部分轨迹控制,避免了在大井斜井段既要增斜又要大范围扭方位的矛盾,降低了水平井施工风险,从而使水平井井眼轨迹更加平滑,井身质量得到可靠保证,钻井速度得到提高.该技术在长庆油田水平井中推广应用取得了较好的效果.
장경유전수지형지모영향,경상수요진행삼유수평정시공.대우파전거불장적중반경수평정,교대적편이거급찬정시공대래풍험.위감소저충시공풍험,통과대장경유전배평3수평정적연구,분석삼유수평정궤적공제특정,개변지재사정단진행궤적공제적전통모식,재직정단사용괄당적찬구결구진행삼유궤적공제,사재정사각흔소시완성부분궤적공제,피면료재대정사정단기요증사우요대범위뉴방위적모순,강저료수평정시공풍험,종이사수평정정안궤적경가평활,정신질량득도가고보증,찬정속도득도제고.해기술재장경유전수평정중추엄응용취득료교호적효과.
Affected by the topography, 3D horizontal well drilling is usally required to be applied to Changqing Oilfield. For the medim-radius horizontal well, a long offset may bring about risks for horizontal drilling. To reduce the risck, Huanping-3 horizontal well is studied, and the trajectory control characteristics are analyzed. The traditional model that trajectory control is only conducted in inclined shaft is changed, BHA appropriate for 3D trajectory control is used in vertical well, so part of trajectory control is completed when the deviation angle is small. This avoids the conflicts between building-up and turning-direction in the high-angle well, decreases the risks in horizontal well drilling, makes the trajectory more smooth, ensures wellbore quality, and improves drilling speed. The theol-ogy has been widely applied in Changqing Oilfield, and acquired good achievements.