垦东405-平1大位移井摩阻扭矩预测及分析研究

Prediction and Analysis of Torque and Drag in an Extended Reach Well Kendong 405-Ping1

为了分析垦东405-平1大位移井钻井施工的可行性,预测起下钻、下套管和钻进时的摩阻、扭矩,分析了各种摩阻扭矩计算模型的优缺点,选择了计算方法可靠、适合于现场应用的软模型,但考虑到大刚度管柱在高曲率井眼中的摩阻扭矩计算误差较大,引入了附加刚性力的概念对其进行了修正,通过管柱力学平衡方程建立了摩阻扭矩计算的修正硬模型。根据该井二开和三开下套管过程中大钩载荷与套管下深关系的预测结果和实测结果的对比情况,所建模型可以满足现场工程要求,且预测结果可指导大位移水平井的施工。

In order to analyze the feasibility of drilling the extended reach Well （ERW） Kendong 405- Ping1 and to predict drag and torque during drill string trip, casing running and drilling operation, the advantages and disadvantages of several models for drag and torque calculation were analyzed and the model with reliable calculation method suitable for field application were identified. Considering the larger error in the calculation of drag and torque of the high rigid pipes in high curvature wellbores, the concept of additional rigid force was introduced to modify the calculation model, the modified model was created based on the pipe string mechanics balance equation. Comparisons of the changes of hook load with depth in the second and third section calculated with model and measured data indicate that the model can satisfy the field requirement and the predicted results can be used to guide the drilling operations of extended reach wells.