Study On Flexible Plunger Pumping System

Centurial years'plunger pumping units seizing 75% of world wells, also have the problems such as higher energy consumption, lower efficiency and bigger investment, therefor they cannot fit for the requirement of energy saving and working level enhancement. In the light of the requirement of energy saving, the flexible plunger pumping system is developed, in the direction of load shedding, single segment efficiency development and construction optimization. The productions are mainly innovated to lift system efficiency and oil production value, such as flexible pumping units, gapless hydraulic self-sealing plunger pump, gapless hydraulic self-sealing well head, flexible rod and continuous driving equipments, which mainly make five breakthroughs below.Flexible pumping unit is innovated using flexibility in place of rigidity. The flexible rope and continuous driving equipments are used to reduce transference segments and depress energy lossing, so the flexible pumping unit can make 1-8 wells production. According to the construction and principle of flexible pumping unit, mathematical models of moving regular and dynamics character are established to analyze the power and torque rules with different wells. With the analysis, a new conception of match is advanced. It means that single well pumping unit adopts partial balance structure, and multi-well pumping unit uses self-balance by sucker rod, which can make power and torque positive forever, to extend the life of motor and decline the energy lossing.With the establishment of finite element model , stability analysis is done for the single-well and multi-well pumping unit. By structure optimization, the optimal structural parameters are gained for further development of flexible units, which can make the change of torque, power and load smaller.In view of the problems that the older hydraulic pumps have in field tests, laboratory testing arrangement is constituted by multi-parameter orthogonal optimization, and the logical pump clearance parameters are confirmed, to solve the problems of case dissolving and bigger load. According to the above analysis, gapless hydraulic self-sealing plunger pump and gapless hydraulic self-sealing well head are developed. The pump adopts composite sealing fashion and multi-centralizer, having the characters of higher efficiency and zero clearance. Function parameters are made by finite element statics analysis. Affecting factors for friction of hydraulic pump is analyzed in house tests, and clearance standard is determined to provide foundation for further development.Computation modules and means of flexible system efficiency are presented at the first time. According to the structure characters, the efficiency composing of system is analyzed systematically, and the computation modules of subsystem are based, the calculator software is programmed. In the view of effect factors, some pertinence measures are taken to have more yield and higher system efficiency.The flexible system has been tested in house and oil field for the application of few delivery capacity and multi-well cluster. The tests indicate that the power, steels amounts and energy consumption are declined by a wide margin in the same condition. The pump efficiency has been raised from 40% to about 70%, and system efficiency has been improved from 15% to 40%. The whole system realizes power balance, zero clearance and lower friction, also has the characters of lower power, few energy lossing, smaller volume and higher efficiency.