水平井封隔器卡瓦的有限元分析及结构改进

Finite element analysis and structure improvements of packer slip in horizontal wells

在石油钻采中,封隔器卡瓦承受巨大压力易发生断裂,直接影响到封隔器的密封性能,从而影响油井的开采过程及生产安全。运用有限元分析软件ANSYS Workbench对卡瓦进行有限元数值模拟分析。施加140 kN载荷时,卡瓦最大应力为230.11 MPa,超过其材料的最大抗压强度;对卡瓦封隔器试验模型进行压裂试验,试验施加压力为186.33 kN时卡瓦发生断裂,测得抗压强度为233 MPa;对卡瓦进行结构设计,卡瓦牙间距尺寸分别为15 mm、25 mm和30 mm。根据有限元分析结果,卡瓦牙间距为30 mm时卡瓦应力、应变分布趋于均匀,所承受的最大载荷为240 kN,最大应力为230.66 MPa、最大变形量为0.058mm,证明此卡瓦结构尺寸较为合理。

Packer slips prone to fracture under tremendous pressure during drilling,it will affect the sealing performance of thepacker directly,and affect the process of mining and safety in production wells.The slip was analysised using the finite element analysissoftware.When the applied load is 140 kN,the slip＇s maximum stress is 230.11 MPa,which exceeding the maximum compressivestrength of this material.The slip packer test mode was undergo a fracturing test,slip fractured when the test pressure is 186.33 kN,thecompressive strength is measured 233 MPa.Slip structure was designed,the spacing sizes of slip tooth were 15 mm,25 mm and 30 mm.According to the results of finite element analysis,when the spacing size of slip tooth is 30 mm,the distribution of the slip＇s stress andstrain tends to uniform.When 240 kN load is applied,the maximum stress exceeds the maximum compressive strength of slip＇s material,and the slip＇s maximum stress is 230.66 MPa,the maximum deformation is 0.058 mm,and provides the slip structure size is reasonable.