Abstract: Currently, with the continuous increase in deep-pumping, hard-extracting wells and heavy oil wells in oilfields, oil recovery technology of progressive cavity pump is being widely used, but the assorted sucker rods are often broken and sheared in downhole due to their own technical limitations. The torsion - withstanding sucker rods used for Progressive Cavity Pumps (PCP) are researched and developed for the second time based on conventional sucker rods. In the innovation, the threaded rod head structure of drillpipe is adopted to strengthen the connection strength. Tests including tensile fracture, torsional fracture, tensile and torsional combined fracture, and tensile and torsional combined fatigue are performed, the test results confirmed that the torsional strength and anti-tripping of the rod heads are effectively improved, so that the maintenance cycles of oil recovery systems of PCPs are greatly extended. This provides conditions for the promotion and popularization of PCPs and allows them to be widely used in Xinjiang oilfield. The application has proven effective, and the number of oilfield workover operations was reduced by more than 50%.

摘要： 目前油田深抽强采和稠油井不断增多, 螺杆泵采油技术被广泛应用, 但与之配套的抽油杆由于自身技术 局限, 经常发生杆柱井下断脱、剪切破坏事故。螺杆泵专用型承扭抽油杆在常规抽油杆基础上进行二次研发, 创新采 用钻杆螺纹杆头结构, 强化联接强度。通过拉伸断裂、扭转断裂、拉扭组合断裂、拉扭组合疲劳系列试验, 测试结果 证实有效提升了杆头抗扭和防脱扣能力, 大幅提升螺杆泵采油系统免修周期, 为螺杆泵的推广和普及提供条件, 在新 疆各大油田广泛应用, 效果良好, 油田修井次数减少50%以上。

关键词: 承扭抽油杆, 稠油, 螺杆泵, 钻杆螺纹, 脱扣