内嵌卡瓦尾管悬挂器坐挂系统力学模型研究

Mechanical Model for Setting the Liner Hanger with Embedded Slips

内嵌卡瓦式尾管悬挂器结构复杂,卡瓦咬合力是决定尾管悬挂器坐挂成功的关键因素。根据内嵌卡瓦坐挂系统的结构形式和加工工艺,根据矩阵理论建立了内嵌卡瓦式尾管悬挂器坐挂系统的力学模型,得到了卡瓦咬合力的理论计算方法,分析了卡瓦的咬合力与尾管重力、加工过程中刀具转角和接触面的摩擦系数的关系。进行了内嵌卡瓦尾管悬挂器与套管的坐挂试验,通过应变测试系统对不同轴向载荷下的套管外侧应变进行了采集与分析,基于拉梅公式进一步得到了卡瓦与套管内壁的接触应力。研究结果表明,卡瓦与套管接触应变的理论计算值与试验平均值比较吻合,最大应力约为平均应力的150%,最小应力约为平均应力的70%。坐挂力学模型理论分析和试验研究结果可以为悬挂器结构的设计和优化提供理论依据。

Liner hangers with embedded slips are structurally complex,and the slip clamping force is the key factor for successful setting the liner hangers.Based on the structures and manufacturing process of embedded slip setting systems,a mechanic model of setting system for embedded slip liner hangers was built by using matrix theories,the theoretical calculation methods were worked out for clamping force of slips,the relationship among the slip clamping force,liner weights,cutter rotation angle and friction coefficient on contact surface were analyzed.Setting tests were performed for the embedded slip liner hanger and casing,outside strain of casing was collected and analyzed with different axial loads by means of strain testing systems,the contact stress between the casing inner wall and the slip was calculated by using Lame＇s Equation.Research results showed that the calculated value of contact strain between the slip and casing coincided with measured mean value.Maximum and minimum stresses are 150%and 75%of the average value respectively.The analysis and test results of setting the mechanical models can provide an important basis for structural design and the optimization of liner hangers.