涡轮钻具防斜打快钻井理论与技术研究

在简要阐述国内典型高陡构造特征的基础上，介绍了我国自主研制的涡轮钻具的结构、能量转换方式以及特点。并在此基础上分析了在山前高陡构造钻井过程中存在机械钻速低和井身轨迹控制难两大钻井难题的原因；详细讨论了涡轮钻具的高转速特性，配合PDC等一体式钻头进行复合钻进实现防斜打快的机理；为达到涡轮钻具防斜打快的目的，提出了钟摆结合光钻铤的下部钻具组合形式，给出了典型钻具组合，并对该钻具组合进行了详细的力学特性分析，得出了稳定器安装位置和涡轮转速范围的涡轮钻具防斜打快的最佳工作区域概念。该技术的研究，为国内高陡构造地区控制井斜和提高机械钻速提供了一种非常有益的钻井理念和技术方法。

Theoretical and Technical Study of Deviation Control and Fast Drilling in Turbodrill

This paper briefly introduces the typical high steep structure of China and describes the structure and the energy converting method and characteristics of the turbodrill self developed. The reasons of the low penetration rate and difficulty in controlling the wellbore trajectories in the high-steep structure were analyzed. The paper discussed in detail the high rotation property of turbodrill and the mechanism of the deviation control when the turbodrill is combined with PDC. In order to deviation control and fast drilling, this paper proposed the drilling assembly of pendulum combined drill collar and gave the typical drilling assembly. The mechanics characteristics of this drilling assembly were analyzed in detail. This paper proposed the concept of best working zone for the turbodrill of stabilizer installation position and rotation range of the turbodill. This study provides the theoretical and technical method for deviation control and fast drilling in high-steep structure.