Progressive cavity pump(PCP) petroleum production is a new mechanical mining style which is rapidly developed in the last 10 years. In this paper, a new PCP system of surface direct-driven is designed. Comparing with the traditional screw pump system, operational reliability enhance for reducing the mechanical decelerator, and manipulation become flexible. Because back spin is a key problem of screw pump system, reversal braking function is increased to overcome hazard bring from it. In order to research sucker rod storage energy and system dynamic braking, a mathematics model is built and system simulation is performed. Some conclusions and suggestions were given in the paper, which is some reference value to the design and control of surface direct-driven screw pump system.
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