关键词: 承扭抽油杆, 稠油, 螺杆泵, 钻杆螺纹, 脱扣

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%.