径向水平井钻杆弯曲转向建模与阻力仿真研究

通过采用ANSYS仿真软件对转向器系统构成、滑道截面形状和轨迹、材料模型、约束载荷进行系统分析,建立仿真模型,仿真与试验数据对比表明,所建仿真模型是可行的;通过分析研究滑道阻力变化对钻进影响,不同摩擦系数对滑道阻力影响,以及钻杆截面变形和钻杆在水平段形位变化,得到的钻杆截面变形及滑道阻力变化规律,并将仿真数据与室内实验结果进行对比分析验证。依据仿真分析和实验研究,分析钻井失败的主要原因。仿真研究对指导造斜器设计和施工工艺的设计有积极意义。

Research on the modeling of simulation of the drill pipe of URRS' turning and bending system and simulation of the resistance

At present, the key problem in domestic test is that the drill pipe is difficult to move through the slideway of whipstock.So the finite element method is a mainly research ways because of the limited using test and theory analysis. The paper constructs simulation through completely structure of URRS' turning and bending, the cross-section and the locus, constructing model and restrained load using the software of ANSYS. The datum of simulation is contrasted to the lab experiment to prove the rationality. And it gets the law of he drill pipe cross-section's deformation and the resistance variation, and looks for the main cause of the drill fail,according to the total analysis the effect to the drilling of the resistance, of different frictional coefficient, the variation of the drill pipe section . The first possible reason is that the drill pipe interferes with the stratum because the deformation of the front top of the drill pipe makes the bit run off the axial orientation of the drill pipe. The second possible reasons of the fail is that something enters into the slideway of the whipstock, which worsens the friction situation between the drill pipe and the slide-way and bring interference between them of three. All these will help and guide the design and contruction of the slideway of the whipstock.