Abstract: There are many existing methods for well trajectory design while drilling,which include two-dimensional and three-dimensional methods. They have a common shortcoming that the designed well trajectory is not sure to be an optimized or a possible optimized trajectory. The paper introduces the nonlinear programming method under nonlinear constraints to well trajectory design while drilling and puts forward an optimization method for well trajectory design. The method can not only satisfy the oilfield construction condition and the well trajectory design while drilling, but also assure the designed well trajectory to be the most slip,the shortest and possible optimized well trajectory. The example in the end of the paper shows the method is right and reliable.

Key words: horizontal well, well trajectory, drilling design, optimization, nonlinear programming

摘要： 现有待钻井眼轨迹设计的方法很多,涉及到二维方法和三维方法,但它们有一个共同的缺点,即设计出来的井眼轨迹不能确信为一条最优的待钻轨迹或可行的最优待钻轨迹。为此,开展了本文的研究工作。本文将非线性不等式约束下的非线性数学规划理论引入到水平井待钻井眼轨迹设计中,提出了水平井待钻井眼轨迹的最优化设计方法。此方法不仅能够满足现场施工条件的限制和待钻井眼轨迹设计的要求,而且能够确保得到的待钻井眼轨迹为一条最光滑的、最短的、可行的最优待钻井眼轨迹。文章最后的实例计算表明,本文提出的水平井待钻井眼轨迹最优化设计方法是正确的、可靠的。

关键词: 水平井, 井眼轨迹, 钻井设计, 最优化, 非线性规划