为满足各种导向钻井方式的井眼轨迹控制需求,建立了导向钻具的定向造斜方程及井眼轨迹的过程控制方法,并进行算例分析。通过证明导向钻具的定向方向与井眼轨迹的主法线方向相一致,建立了导向钻具的定向造斜方程。通过建立导向钻具的造斜率-工具面角、造斜率-定向方位角关系曲线,提出了井眼轨迹的过程控制技术。研究表明：导向钻具的造斜率决定了井眼轨迹的井眼曲率,导向钻具的定向方向决定了井眼轨迹的主法线方向;定向方位角与工具面角均具有定向功能,二者可以互算且互为补充。研究结果揭示了导向钻具与井眼轨迹之间的相互作用机理及控制机制,据此能根据设计的井眼轨迹形成井眼轨迹的控制方案,并随钻控制和监测导向钻具的工作特性。图4表1参12
To meet the wellbore trajectory control requirements for all kinds of steering drilling modes, the directional deflection equations for steerable drilling tools and the process control method for wellbore trajectory were proposed and an application example was given. By proving that the orientation direction of steerable drilling tool was consistent with the principal normal direction of borehole trajectory, directional deflection equations for steerable drilling tools were established. By establishing the relation curves between the build-up rate and tool face angle, and the relationship between built-up rate and orientation azimuth angle of steerable drilling tool, a process control technique for wellbore trajectory was presented. The research shows that the build-up rate of steerable drilling tool determines the curvature of wellbore trajectory, the orientation direction of steerable drilling tool determines the principal normal direction of wellbore trajectory; the orientation azimuth angle and the tool face angle both have the orientation function, and they can calculate and complement each other. These research results reveal the interaction mechanism and control mechanism between steerable drilling tools and wellbore trajectory, so the control scheme of wellbore trajectory can be formed based on the planned wellbore trajectory, and operating characteristics of steerable drilling tool can be controlled and monitored while drilling.
[1] 苏义脑. 地质导向钻井技术概况及其在我国的研究进展[J]. 石油勘探与开发, 2005, 32(1): 92-95.
SU Yi’nao. Geosteering drilling technology and its development in China[J]. Petroleum Exploration and Development, 2005, 32(1): 92-95.
[2] 高德利. 井眼轨迹控制问题的力学分析方法[J]. 石油学报, 1996, 17(1): 115-121.
GAO Deli. A mechanical model for prediction and control of the wellbore trajectory[J]. Acta Petrolei Sinica, 1996, 17(1): 115-121.
[3] LUBINSKI A, WOODS H B. Use of stabilizers in controlling hole deviation[J]. Journal of Oral Rehabilitation, 1955, 35(2): 111-115.
[4] 刘乃震, 王国勇. 四川盆地威远区块页岩气甜点厘定与精准导向钻井[J]. 石油勘探与开发, 2016, 43(6): 978-985.
LIU Naizhen, WANG Guoyong. Shale gas sweet spot identification and precise geo-steering drilling in Weiyuan Block of Sichuan Basin, SW China[J]. Petroleum Exploration and Development, 2016, 43(6): 978-985.
[5] 白家祉, 苏义脑. 定向钻井过程中的三维井身随钻修正设计与计算[J]. 石油钻采工艺, 1991, 13(6): 1-4.
BAI Jiazhi, SU Yi’nao. Design and calculation of 3D wellbore trajectories during directional drilling[J]. Oil Drilling & Production Technology, 1991, 13(6): 1-4.
[6] LIU Xiushan, SHI Zaihong. Improved method makes a soft landing of well path[J]. Oil & Gas Journal, 2001, 99(43): 47-51.
[7] 韩志勇. 三维定向井轨道设计和轨迹控制的新技术[J]. 石油钻探技术, 2003, 31(5): 1-3.
HAN Zhiyong. The new techniques of well trajectory design and well path control fit for 3D directional wells[J]. Petroleum Drilling Techniques, 2003, 31(5): 1-3.
[8] 刘修善, 苏义脑. 井斜控制方案设计方法[J]. 石油学报, 2015, 36(7): 890-896.
LIU Xiushan, SU Yi’nao. A design method of borehole deviation control scheme[J]. Acta Petrolei Sinica, 2015, 36(7): 890-896.
[9] 刘修善, 王超. 空间圆弧轨迹的解析描述技术[J]. 石油学报, 2014, 35(1): 134-140.
LIU Xiushan, WANG Chao. Analytic description of spatial-arc wellbore trajectory[J]. Acta Petrolei Sinica, 2014, 35(1): 134-140.
[10] 刘修善, 苏义脑. 空间圆弧轨迹的井斜演化规律及控制模式[J]. 石油勘探与开发, 2014, 41(3): 354-358.
LIU Xiushan, SU Yi’nao. Evolution pattern and control mode of well deviation for circular-arc trajectories in space[J]. Petroleum Exploration and Development, 2014, 41(3): 354-358.
[11] SAMUEL G R, LIU Xiushan. Advanced drilling engineering: Principles and designs[M]. Houston: Gulf Publishing Company, 2009.
[12] 国家能源局. 定向井轨道设计与轨迹计算: SY/T 5435—2012[S]. 北京: 石油工业出版社, 2012.
National Energy Administration. Wellpath planning & trajectory calculation for directional wells: SY/T 5435—2012[S]. Beijing: Petroleum Industry Press, 2012.
