单弯双稳螺杆钻具组合防斜纠斜能力研究

Research on the correction and anti-inclination capability of single bend double stable screw drilling tool combination

摘要:

随着我国对深部地质资源勘探开发的不断深入，深部矿藏已成为地质找矿工作的重点。在深部找矿钻探过程中，高陡构造地层直井段保直问题，是一直困扰钻井技术人员的一个主要难题，严重影响深部矿藏的勘探效率。在易发生井斜段，单弯双稳螺杆钻具是最常用的防斜纠斜钻具组合。本文基于纵横弯曲梁法和平衡趋势原理建立底部钻具组合力学模型，通过模型分析各个因素对纠斜能力的影响规律，结合正交试验设计方法，确定主控因素；最后，基于多目标优化理论，建立防斜打快钻井控制参数多目标优化方法，获取最优参数组合。基于上述研究，形成一套防斜打直优化设计方法，提高高陡构造地层直井段钻探效率，推动深部矿藏的高效、低成本钻探和开发。

Abstract:

With the deepening of exploration and development of deep geological resources in China， deep mineral deposits have become the focus of geological prospecting work. In the process of deep prospecting and drilling， the problem of maintaining the straightness of the vertical well section in the high steep structure has been a major problem for drilling technicians， which seriously affects the exploration efficiency of deep mineral deposits. In the inclined section， the single bend bistable screw drill is the most commonly used anti-deviation and correction drill assembly. In this paper， a mechanical model of BHA is established based on the crossbar bending beam method and the principle of equilibrium trend. The influence law of each factor on the deviation correction ability is analyzed through the model， and the main control factor is determined by the orthogonal test design method. Finally， based on the theory of multi-objective optimization， a multi-objective optimization method for control parameters of fast drilling is established to obtain the optimal parameter combination. Based on the above research， a set of anti-skew and straightening optimization design method is developed to improve the drilling efficiency of the vertical well section of the high steep structure， and promote the efficient and low-cost drilling and development of deep mineral deposits.