摘要
利用下部钻具力学分析和钻头与地层相互作用模型来预测和控制井眼轨道对于大多数钻井作业来说仍是一个难题。文章分析了沿钻头的瞬时钻进方向向前差分存在的问题;在分析井眼轨道形状的基础上,提出了井眼轨道预测的4点新认识,建立了侧向钻速等于零的预测和控制准则;分别建立了井眼轨道预测方程、井眼轨道控制方程、钻具导向能力预测方程,并应用于国家重点科技攻关项目和“863”项目中。预测数据与实测结果误差较小。以井眼轨迹光滑为目标,将下部钻具组合三维力学分析与三维钻速方程相结合建立的井眼轨迹预测方程较其它轨迹预测方法具有明显的理论上的先进性和实际应用上的可靠性与准确性。
It still is a difficult subject for most dril ling engineers to predict and control well path by applying the mechanical analy sis of bottom hole assembly and the rock-bit interaction model. In the paper, the problems existing in the forward difference along the instantaneous drilling direction of bit are discussed; 4 new views on well path prediction are propos ed on the basis of analyzing well path shape; the prediction and control criter ia that the side drilling rate is equal to zero are established; and well path prediction equation, well path control equation and drill tool orientation capa city prediction equation are set up respectively. All of these equations were ap plied to the project of the Key Technologies Research and Development Program an d the 863 Program project. The error of the predicted data in contrast to the me asured results was relatively small. By taking the smooth well path as the targe t, the well path prediction equation was derived by combining the 3-D mechanic al analysis of bottom hole assembly with the 3-D drilling speed equation. This well path prediction equation is evidently advanced in theory and reliable and a ccurate in practice, as compared with the other well path prediction methods.
出处
《天然气工业》
EI
CAS
CSCD
北大核心
2005年第5期62-64,共3页
Natural Gas Industry
基金
国家863项目"旋转导向钻井系统整体方案设计及关键技术研究"(编号:2001AA602013)
国家重点科技项目(攻关)计划"侧钻水平井钻井采油配套技术"(编号:95-108-04-02) 的研究成果。~~
