Weidefu company designed and developed the arrow-type screw pump. Due to the requirement that the rod be moved instead of the tubing string, plug-in screw pumps reduce pump run time and residence time when increasing phase. This patented design reduces the pump part length by 1/2 to 2/3. Therefore, the new screw pump can lift high, with greater capacity. According to the tubing size and operating conditions, the new pump capacity of 685t / d, lifting height of 1600m. In addition, this shorter pump configuration facilitates shipping and handling. Use a single pump seat and a non-rotating tool to fix the pump without special shorting. The new pump is easy to install and does not need to be isolated from the tubing to accommodate this particular pump length. Therefore, different sizes of plug-in pumps can be used on the same tubing without the need for an oil pipe. The simplified parts are much easier to run, more reliable than double junction systems, and seldom cling to sand or debris. Prior to the insertion of a casing with a submerged screw pump tubing, the lifting tool was originally applied to an ordinary screw pump and effective compensation was achieved by frequent pump changes to reduce maintenance costs. Recently, Weatherford Corporation applied the new system to the Canadian oil field and was started about 17 months after a normal pump was applied to a horizontal well. Use plug-in screw pump flushing device for workover, operating time is only 3h. If you use ordinary screw pump to complete similar operations required 8h. The cost of changing a pump for a flushing unit is usually $ 141 / h, while the cost of replacing an ordinary screw pump with a workover rig is $ 266 / h. The pump efficiency after a new pump is changed is 91%.
