Research and Experiment on Lifting Technology of a Diaphragm Submersible Reciprocating Pump

The diaphragm type submersible reciprocating pump lifting technology is a new technology and equipment for rodless oil production proposed for “three low” reservoirs, highly deviated wells, and horizontal wells. It is currently in the initial stage of experimental research and has a broad application prospect. This paper conducts research on the operating mechanism of diaphragm type submersible reciprocating pumps, gives the characteristic curve of the diaphragm pump, according to the operating characteristics of diaphragm type submersible reciprocating pumps, proposes a special inverter control device design and research, and development plan, and finally analyzes the unique technology determined by the special diaphragm chamber structure design Advantages: Propose a technical solution for harmonic control of the inverter and design a non-standard dedicated sine wave filter. Two wells were tested on site. The maintenance-free periods were 812 days and 654 days, respectively. The average pump efficiency was 89.8%, the power saving rate was 45.78%, and the system efficiency was 25.18%.The harmonic control effect of the sine wave filter is good, which effectively verifies the reliability, adaptability and economy of the process, and highlights the good technical advantages. The downhole working condition monitoring and fault diagnosis method, low-cost wax removal and prevention method and process, intelligent cable laying composite coiled tubing and other technologies are proposed, which lays the foundation for in-depth scientific research and field tests in the future, points out the direction of scientific research, and is conducive to the development of a diaphragm submersible reciprocating pump in the direction of intelligence and digitization.