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为了满足深部高温地层、地热井等恶劣钻井工况的需要,提出大长径比螺旋曲面等壁厚金属定子衬套与转子啮合的方法。研究了金属定子衬套外高压成形方法。考虑摩擦润滑、管件尺寸、材料性能参数、加载压力和加载路径等参数,建立了大长径比螺旋曲面金属定子衬套外高压数值模型。对金属定子衬套外高压成形过程进行了模拟,提出了“壁厚相对误差、圆角贴模系数、成形质量系数”三项等壁厚金属定子衬套成形质量评价指标。并利用熵权法确定了各个评价指标的权重,获得各内径管件成形质量综合评价值。结果表明:采用外高压成形工艺可以获得大长径比螺旋曲面状金属定子衬套,在给定成形参数下,内径86 mm的管件成形质量最优。
In order to meet the need of deep drilling conditions such as deep high temperature formation and geothermal well, the method that the large aspect ratio helical curved wall thickness metal stator bush and the rotor are engaged is proposed. The forming method of metal stator bushing external high pressure was studied. Considering the parameters of friction and lubrication, pipe size, material performance parameters, loading pressure and loading path, the numerical model of high aspect ratio helical surface metal stator bushing is established. The external high pressure forming process of metal stator bushing was simulated and the forming quality evaluation index of wall thickness metal stator bushing such as “relative error of wall thickness, coefficient of fillet mold, coefficient of forming quality” was put forward. The entropy weight method was used to determine the weight of each evaluation index and get the comprehensive evaluation value of the forming quality of each tube. The results show that the high aspect ratio helical curved metal stator bushing can be obtained by the external high pressure forming process. Under the given forming parameters, the forming quality of the tube with the inner diameter of 86 mm is the best.