Design Of Electrohydraulic Control System Of Traveling Test-oil And Test-tree Lift Equipment

In the process of test-oil and test-tree for specialty oil and low yield oilfield, sucker rod pump is more adaptive to prospect well than other pumps. Sucker rod pump need to fit up with lift equipment, namely pumping unit. In order to increase yield of oil well and promote efficiency, the pumping unit should work with long-stroke and low-frequency. But regular walking-beam pumping unit is bulky and fixed, meanwhile, its stroke and frequency can not be regulated. In order to avoid the risk of ground construction investment, shorten the period of test-oil and test-tree, this paper proposes a scheme of electro-hydraulic system of traveling test-oil and test-tree lift equipment which can be moved quickly and utilized for new well first-exploit and old well second-exploit. This pumping unit integrates modern mechanical, hydraulic, test and control technologies and can meet the requirements of oil exploitation.The main research contents are as follows.In chapter 1, different kinds of facilities of oil exploitation, home and abroad, and their characteristics, development course, and actuality are summarized. The research meaning and design contents of this paper are also summarized.In chapter 2, various holistic and partial design schemes of traveling hydraulic pumping unit are analyzed and compared. According to realistic situation, the most optimized scheme is confirmed and applied.In chapter 3, based on modern hydraulic principle and considering the characteristics of oil exploitation, the hydraulic system is designed to meet the requirements on stroke and frequency. The system parameters are calculated, the component parts is shaped with 3D software and the structure of pumping unit is designed. Finite element analysis is operated to insure the intensity of the valve blocks.In chapter 4, the electro-hydraulic control system is designed to realize automatic running. The simulation model is structured and the simulation results are also analyzed to estimate if the hydraulic system is normal or not. Based on the technology of electro-hydraulic proportional control, the unit can adjust the speed and regulate the stroke and the frequency continuously. The outside structure and inside circuit of the portable control unit are designed too. The electro-hydraulic monitor system is designed to inspect and supervise the system condition. Utilizing virtual instrument software, the interface is designed to operate the monitor system friendly and conveniently.In chapter 5, some conclusions are given and some new views are put forward in the future.