石油勘探与开发
石油勘探與開髮
석유감탐여개발
PETROLEUM EXPLORATION AND DEVELOPMENT
2014年
3期
354-358
,共5页
钻井理论%定向钻井%井眼轨迹%井斜演化
鑽井理論%定嚮鑽井%井眼軌跡%井斜縯化
찬정이론%정향찬정%정안궤적%정사연화
drilling theory%directional drilling%wellbore trajectory%well deviation evolution
建立空间圆弧轨迹的井斜方程，得到空间圆弧轨迹所在斜平面姿态、空间圆弧轨迹井斜角极值等求解方法，揭示空间圆弧轨迹的井斜演化规律及控制模式。可分别由正演模型和反演模型计算出空间圆弧轨迹上任一点的井斜角和方位角、斜平面姿态的倾斜角和倾斜方位角以及轨迹井斜角极值点参数，正演模型和反演模型的计算结果完全相同。空间圆弧轨迹或其趋势线存在井斜角极值点，极小和极大井斜角点的井眼轨迹切线分别指向所在斜平面的下倾和上倾方向，两个极值点的弯曲角和方位角均相差180°。斜平面姿态参数、井斜角极值点参数与井段始点的井斜角和工具面角有关，与井段长度无关。对于空间圆弧轨迹，斜面倾角模式存在二义性，应使用工具面角或定向方位角控制模式。图3表4参20
建立空間圓弧軌跡的井斜方程，得到空間圓弧軌跡所在斜平麵姿態、空間圓弧軌跡井斜角極值等求解方法，揭示空間圓弧軌跡的井斜縯化規律及控製模式。可分彆由正縯模型和反縯模型計算齣空間圓弧軌跡上任一點的井斜角和方位角、斜平麵姿態的傾斜角和傾斜方位角以及軌跡井斜角極值點參數，正縯模型和反縯模型的計算結果完全相同。空間圓弧軌跡或其趨勢線存在井斜角極值點，極小和極大井斜角點的井眼軌跡切線分彆指嚮所在斜平麵的下傾和上傾方嚮，兩箇極值點的彎麯角和方位角均相差180°。斜平麵姿態參數、井斜角極值點參數與井段始點的井斜角和工具麵角有關，與井段長度無關。對于空間圓弧軌跡，斜麵傾角模式存在二義性，應使用工具麵角或定嚮方位角控製模式。圖3錶4參20
건립공간원호궤적적정사방정，득도공간원호궤적소재사평면자태、공간원호궤적정사각겁치등구해방법，게시공간원호궤적적정사연화규률급공제모식。가분별유정연모형화반연모형계산출공간원호궤적상임일점적정사각화방위각、사평면자태적경사각화경사방위각이급궤적정사각겁치점삼수，정연모형화반연모형적계산결과완전상동。공간원호궤적혹기추세선존재정사각겁치점，겁소화겁대정사각점적정안궤적절선분별지향소재사평면적하경화상경방향，량개겁치점적만곡각화방위각균상차180°。사평면자태삼수、정사각겁치점삼수여정단시점적정사각화공구면각유관，여정단장도무관。대우공간원호궤적，사면경각모식존재이의성，응사용공구면각혹정향방위각공제모식。도3표4삼20
The well deviation equation of circular-arc trajectory in space was established, the solution methods to determine the posture of the inclined plane that the circular-arc trajectory lies on and the extreme value of inclination angle of the circular-arc trajectory were presented, and the evolution pattern and control mode of well deviation for circular-arc trajectories in space was revealed. Some parameters can be calculated by the forward model and inverse model respectively, including the inclination angle and azimuth angle at any point along a circular-arc trajectory, the inclined angle and inclined azimuth angle of the inclined plane that the circular-arc trajectory lies on and the various parameters at the point with extreme inclination angle, and the calculated results from the forward model are the same as those from the inverse model. There are two points with extreme inclination angles along a circular-arc trajectory or its trendline, and the tangent lines of wellbore trajectory at the points with minimum and maximum inclination angles point to downdip and updip directions of the inclined plane respectively, the bending angle and azimuth angle differences between the two points are both 180°. The posture of inclined plane and parameters at extreme inclination points relate to the inclination angle and tool face angle at the beginning point of well interval, but have nothing to do with the interval length. The inclined angle mode for controlling a circular-arc trajectory is ambiguous, so the tool-face angle or directional azimuth angle modes should be used.
