Research and Application of Anti Eccentric Wear Technology of Rod and Tubing in Oil Production of PCP

The oil production technology of PCP has the advantages of low investment costs, less area occupancy and high system efficiency, but due to the serious eccentric wear of rod and tubing, which restricts the further expansion of the application scale. The matching rod and tubing reducing eccentric wear technology is formed by improving the supporting process of the PCP. Firstly, the anti-rotation torque anchor is used to replace the support clips, to stretch the tubing column naturally, reducing the contact probability of the rod tubing and avoid partial eccentric wear; Second, the internal sprayed tubing is applied to improve the anti-friction ability and prolong the service life. Indoor experiment shows: the dynamic test platform is used to test torque, when the torque is 4000 N \(\cdot\) m, the anti-rotation torque anchor and casing have no relative sliding and the process is reliable. Ordinary N80 pipe, internal sprayed tubing and plastic lined tubing were tested by MC-2000 friction testing machine, the friction amount of the internal sprayed tubing is 0.82 mm and the sucker rod coupling is 0.006 mm, which are the lowest in different sorts, the wear resistance and self-lubricating performance of the internal sprayed tube is verified. The field application of 57 wells, 7 wells with anti-rotation torque anchor extended the pump inspection cycle by 282 days, 50 wells of internal sprayed tubing extended the pump inspection cycle by 149 days. The anti eccentric wear technology of PCP had reduced the number of operations, which can be further promoted and applied.