Developing bottom hole assembly deflection design optimization platform

定向钻井是世界范围内首选的钻井方法，因为它比传统的垂直钻井具有更高的通用性，主要是通过开采页岩地层中的储层。为了钻出弯曲轨迹，在井下马达中需要弯曲。近年来，已经存在设计在弯曲位置和钻头之间具有短距离的马达的工业趋势，这导致在马达部件上具有较小机械负载和应力的情况下更尖锐的曲率。由于在钻井过程中无法接近电机，因此记录可靠的性能数据以进行设计优化是非常具有挑战性的。当前CRD提案的总体目标是开发参数建模和优化工具，以研究定向钻井过程中电机设计参数对井底钻具组合（BHA）性能的影响。所提出的基于有限元的模型将有一个定制的解决方案引擎和优化模块，具有处理非线性接触问题的能力。

Directional drilling is the preferred worldwide method of drilling by virtue of its increased versatility over conventional vertical drilling, mainly by exploitation of reservoirs in shale formations. To drill a curved trajectory, a bend is required in the downhole motor. In recent years, there has been an industrial trend to design motors with short distance between the bend location and the drill bit, which results in sharper curvature with less mechanical load and stress on the motor components. Since there is no access to the motor during drilling, it is very challenging to record reliable performance data for design optimization purposes. The overall goal of the current CRD proposal is to develop a parametric modeling and optimization tool to study the effect of motor design parameters on the performance of the bottom hole assembly (BHA) during the directional drilling process. The proposed finite element-based model will have a customized solution engine and optimization modules with the capability of handling nonlinear contact problems.