Plunger-type submersible pump production technology and test by linear motor Huang Hua, Zhao Yajie (Research Institute of Shaanxi Yanchang Petroleum (Group) Co., Ltd., Xi'an, Shaanxi 710075, China) Luo Jiangyun (South Oil Production Plant, Yanchang Oilfield Co., Ltd., Yan'an, Shaanxi 717100, China) Aiming at the problem of serious rod eccentricity, low system efficiency, and short cycle time for inspection of pumps in rod pump production process in Yanchang Oilfield, a linear motor-driven plunger submersible pump production process was proposed and carried out in the Southern District Oil Production Plant. Production test. The test results show that this process solves the problem of eccentric wear of rods, improves energy efficiency, prolongs the cycle of inspection and repair of wells, and is an effective oil recovery process for improving the efficiency of oil production plants.
Linear motor;Plunger submersible pump;Extension of oil production process The oil field is a well-known “low-permeability, low-pore, low-energy†three-low oil field, which has already entered the secondary and tertiary oil recovery stages. The system is a rod pump “three pumping†system consisting of pumping units, sucker rods, and oil pumps.With the deep exploration and development of oil fields, a large number of injection wells have been injected, and a large number of directional and horizontal wells have been used. A great deal of useless work has resulted in energy wastage, short workover cycles for inspection pumps, increased operating costs, increased production costs, etc. These problems have not only restricted the application of the “three pumping†system in inclined wells and horizontal wells, but have also become The problems that the oil production plant has to solve in order to reduce production costs, increase economic efficiency, and increase market competitiveness.
Under the social background of energy conservation and environmental protection, in order to increase profits and increase market competitiveness, various oil production plants in various oil fields continuously carry out exploration and development on the one hand to increase proven reserves and production of oil; on the one hand, they continue to inject media into the formation and improve Strata energy drives more crude oil into oil wells; on the other hand, it constantly tries new oil production processes to increase energy efficiency and prolong the cycle of inspection and repair of wells to reduce production costs and improve economic efficiency. The linear motor-driven plunger type submersible pump oil production is a new generation of rodless oil recovery technology that uses a submersible linear motor to directly drive a plunger-type submersible pump to produce oil. With the development of linear motor and oil pump technology, the oil production process has become more and more mature, fundamentally solving the phenomenon of eccentric wear in rod pump production. The linear motor's mover movement is consistent with the plunger movement, simplifying the mechanical transmission, and The oscillating parameters are infinitely adjusted to facilitate automatic control. Below, the author elaborated on the oil production process, conducted production tests at the oil production plant, and analyzed the test results.
1 linear motor driven piston submersible pump oil production system and process 1.1 linear motor driven piston submersible pump oil production system linear motor drive piston submersible pump oil production system mainly by the ground control system and underground linear motor and plunger submersible pump composition.
The ground control system ground control system is mainly composed of a main loop, a single-chip microcomputer, a memory module, a rectifier, a switch tube, a transformer, and a detection circuit, and can control the running speed, running time, dwell time, stroke, and stroke times of the linear motor mover. It can automatically adjust parameters according to well productivity.
As shown in the schematic diagram of the linear motor linear motor structure, the structure is cylindrical, the stator windings are placed in the stator core, the permanent magnet is placed in the inner rotor core, the relative movement of the stator of the rotor is realized, and the primary and secondary integrated sealing methods are adopted. Bellows protector structure effectively improves sealing, safety, reliability and heat dissipation.
Plunger-type submersible pump plunger-type submersible pump structure diagram as shown, mainly by the small plunger, large plunger, small pump cylinder, large pump cylinder, upper and lower vent, variable-diameter connector, is in the conventional pump Based on this, an improved combination of plunger and pump cylinder assembly was developed. The pump works in the opposite state to the conventional pump, and the pump raises the liquid during the downstroke.
Huang Hua (1978-), male, 200 years graduated from the university, Ph.D., engineer, is currently mainly engaged in oil production engineering research.
1.2 System Principles of Chiba 1 Small plunger; 2 - Small pump barrel batch; 3 adapter; 4 upper VUE> 5-hole adapter; 6-large plunger> 7-lower VALE; 8 large pump cylinder; 9 -Connecting rod.
Plunger submersible pump structure schematic system technology principle is as follows: In the control system to set the operating parameters of the oil production system, such as the motor running time, stroke, stroke times, etc., through the conversion circuit to the information into electrical signals to control the main circuit, thus Control the motor start and stop, speed, direction, etc. After the stator is energized, the mover reciprocates in the stator and drives the push rod to perform linear reciprocating motion, which in turn drives the pump cylinder of the submersible pump to reciprocate, realizing liquid suction and drainage, thereby realizing oil recovery.
3 system installation 1 - putter; 2 - suction assembly; 3 throat pick; 4 bellows breathing tube I; 5 - sealing short section; 6 - adapter; 7 wiring cover; 8 - lead terminal; 9 a motor lead; 10 on the pressure tube; 11 a joint; 12 - housing; 13 - primary (stator) assembly; 14 - secondary (operator) assembly; 15 - under pressure tube; 16 - plug; 17 - Motor seat; 18 injection valve assembly; 19 protector head; 20 one-way valve; 21 - sealed joint; 22 - bellows breathing tube D; 23 - shell;
Linear motor structure diagram The installation diagram of the linear motor-driven plunger submersible pump oil production system is shown in the figure.
The linear motor is installed under the pump. When the fluid is flowing, part of the heat can be taken away. The motor push rod is connected with the connecting rod of the submersible pump, and the small plunger of the submersible pump is connected with the oil tube. The ground controller inputs the industrial power output terminated by the transformer and the output terminals are connected to the motor terminals.
4 Test and effect analysis The test site is the 3026 well site of Yanchang Oilfield Co., Ltd. Southern District Oil Production Plant. The basic data of each production well when it is put into production is shown in Table 1. The oil layer is mainly extended group length 4 +5 and long 6 oil layer group, fracturing The section is between 840,920m and the pump is hanging over 800 meters with a sunk range of tens of meters.
Under the same conditions of oil layer horizon, underground production capacity, and pump hanging, the linear motor-driven plunger-type submersible pump oil extraction and ordinary rod pump oil extraction are adopted from eccentric wear of rods and tubes, pump efficiency, inspection of well-repair cycles, and economic benefits. Compare it.
Table 1 Basic motor-driven plunger-type submersible pump production wells Basic data Well number horizon Fracturing section / m Pump hanging / m Submergence degree / m Commissioning date is long 6 4.1 Bar eccentric wear Conventional rod pump oil extraction exists In severe cases, it causes the failure of the pipe wear, increases the number and expense of oil well maintenance, and is particularly serious in directional and horizontal wells. It has become a key factor restricting its application. The linear motor drives the plunger-type submersible pump to directly use the motor to drive the oil extraction pump and cancel the sucker rod, which means that there is no partial wear of the rod tube. Therefore, the problem of eccentric abrasion of the rod tube is fundamentally solved.
4.2 Pump efficiency Table 2 Comparison of pump efficiency before and after production of linear motor-driven plunger pump production at the well No. average production liquid/m3d-1 theoretical displacement of the rod pump based on current production, pump diameter 44mm, with pole chest punch 5 times/min , Rodless pump selection 0.5 times / min, calculate the pump efficiency of the two kinds of oil production process, the calculation results are shown in Table 2. The underground production capacity is certain, because the ordinary rod pump oil pumping times are limited by the mechanical device, the minimum can only be transferred to 46 Times / min, seriously affect the degree of fullness of the pump, resulting in very low pump efficiency, generally below 10%. Linear motor-driven plunger-type submersible pumps can be used for oil production. Between 11 times/min, the stepless adjustment of the flushing time and the adjustment of the small flushing time can increase the pump fullness, and the pump efficiency can be increased to more than 40%.
4.3 Check the maintenance cycle of the pump Before this, due to wear of the plunger and the pump barrel caused by eccentric wear and high stroke of the rod and pipe, the average workover period of the 3026 wellsite was about 120d.
After the linear motor-driven plunger submersible pump was used, the 9 wells in the 3026 well site had not been well-tested and the overhaul period had exceeded 4 days since there was no partial eccentricity of the rods and the number of strokes was small. Extended inspection pump maintenance cycle.
4.4 Economic Benefits For a single well, the commissioning cost of the linear motor-driven piston submersible pump was 268,000 yuan, and the ordinary rod pump production cost was 17,000 yuan, and more investment was 81,000 yuan. The rod pump costs 52,000 yuan per year, the rodless pump costs 11,000 yuan per year, and saves 42,000 yuan. The cost of more investment can be recovered within 2 years, and the annual single well cost savings can be about 80%.
5 Conclusion In the field of 3026 wells in the southern oil field of the Yanchang Oilfield, a linear motor-driven plunger-type submersible pump was used for oil extraction test. The pumping parameters can be adjusted steplessly during the oil extraction process. By comparison with the common rod-pumped oil extraction technology before the test, It was found that the linear motor-driven plunger-type submersible pump oil extraction process canceled the sucker rod, completely overcame the problem of eccentric wear of the rod tube, prolonged the well-repair period of the inspection pump, and the overhaul period exceeded 400d; the pump efficiency was improved and the pump efficiency reached over 40%; The cost of wells has been reduced each year, saving about 80%, which has significantly improved economic efficiency. In short, the linear motor-driven plunger-type submersible pump is proved to be an effective lifting technology for low-permeability, low-hole, and low-energy fields.
Yang Kun, Wu Xiaodong, Shi Junfeng, etc. Application of 3D visualization technology for well design Oil well centralizer installation location Oil drilling technology, 2009, 31(5): 5659 Liu Qingqi, Tang Qing, Sun Fushan, etc. Well rods and tubes for pumping units Anti-bias grinding tools are preferred and applied. Oil drilling technology, 29, Liu Xiangjun, Wang Putan development and prospect of oil production engineering. Oil drilling technology, 2000, Wan Renxuan, Luo handsome. Oil Production Technology Manual (Revised Edition) Volume 4: Mechanical Oil Recovery Technology Beijing: Petroleum Industry Press, 2002: 112-361. Wu Zongxin. Development of a linear motor driven submersible rodless pump. Beijing: China University of Petroleum, 2007. Wang Ruiwen. Magnetic drive submersible pump lifting technology Hong Yunfei
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