大位移井井眼轨迹控制技术方案的优化

OPTIMIZATION OF TRAJECTORY CONTROL METHODS FOR EXTENDED REACH WELL-BORE

针对大位移井眼轨迹控制技术难点 ,文章分析了西江 2 4 - 3油田 4口大位移井的井眼轨迹控制技术 ,探讨了大位移井井眼轨迹控制技术的机理 ,并对大位移井井眼轨迹的控制方案进行了优化。结果表明 ,西江 2 4 - 3油田大位移井的井眼轨迹控制技术实际上是可调和不可调滑动导向钻具组合连续导向和旋转导向工具连续导向钻井技术的综合。旋转导向工具进行连续导向钻井具有随时可控性 ,轨迹控制质量高 ,但使用成本很高。在充分掌握滑动导向钻具组合导向力变化规律的基础上 ,在一定范围内 ,这种钻具组合仍然具有很好的应用效果。技术和经济方面的因素决定了小位移时采用滑动导向钻具组合连续导向钻井技术 ,而在较大位移时采用旋转导向工具的控制方法是最优的轨迹控制方案。

Aiming to the problem of trajectory control techniques for extended reach well-bore, the trajectory control techniques used for 4 extended reach well-bores in XJ24-3 oil field are analyzed in the paper, The mechanism of trajectory control techniques for extended reach well-bore is discussed. And trajectory control programs for extended reach well-bore are optimized. The results indicate the trajectory control technology for extended reach well-bore used in XJ24-3 oil field is virtually the combination of the steering techniques of modulated or non- modulated slid-steering BHA and the rotary steer-able drilling system. The steer-able rotary drilling system can control the well path timely and accurately, but it is too expensive. The continuous steering technology with a slid-steering BHA can get good application if the changing rule of its steering force can be well understood. It is determined by the technical and economic factors that the slid-steering technology should be used when the displacement is small and the rotary steering technology should be used when the displacement is big, which is the optimum trajectory control program for extended reach well-bore.