How to solve the problem of fracture and failure of the small-diameter pump SRP cage in the submersible linear motor oil recovery system?
In oilfield exploitation, due to the reduction of formation pressure and the impact of surface facilities and construction, a large number of inclined or horizontal wells are used in the drilling process.
In the production process of inclined wells or horizontal oil wells, if a rod pumping system is used, it is easy to cause partial wear of the tubing and sucker rods and accidents such as tubing wear and loss and sucker rod breakage may occur. In recent years, various oil fields in China have started to use submersible linear motor oil recovery systems for exploitation.
Linear motor pump intelligent oil production outfit is composed of three parts: control cabinet, submersible linear motor, plunger pump. The power is transmitted to the stator of the downhole linear motor through the cable. The stator produces strong magnetic force, drives the rotor, and moves up and down according to the required speed under the instructions of the ground control cabinet.
The upper end of the rotor is connected with the special tubing pump plunger to move up and down to realize the downhole liquid lifting. Linear motor pump intelligent oil production outfit is composed of three parts: control cabinet, submersible linear motor, plunger pump.
The power is transmitted to the stator of the downhole linear motor through the cable. The stator produces strong magnetic force, drives the rotor, and moves up and down according to the required speed under the instructions of the ground control cabinet. The upper end of the rotor relates to the special tubing pump plunger to move up and down to realize the downhole liquid lifting.
It belongs to rod-less oil recovery, which can completely solve the problems of partial wear and breakage of tubing and sucker rods, extend the maintenance-free period of oil fields, and greatly improve the efficiency of oil wells. And production efficiency.
The cages of conventional sucker rod pumps currently used in oilfields must withstand the pull or thrust of the puller rod of the oil pumping system. The displacement of the submersible linear motor oil extraction system is small, the pump diameter of the commonly used oil pump is small, and the diameter of the cage is small.
When the valve cage is subjected to the alternating load of the puller rod of the pumping system, it is easy to break, causing the sucker rod pump to fail. In addition, the submersible linear motor oil recovery system is mainly used in inclined wells or horizontal wells. Due to gravity, the pump will produce contact and impact between the valve ball and the inner wall of the valve cage.
Since each impact location is the same point on the sealing surface of the lower end of the valve seat, over time will cause the valve seat seal to fail, thereby shortening the service life of the pump.
In order to better solve the problem of the failure of the valve cage of the small-diameter oil pump and the failure of the sealing of the valve seat caused by the partial wear of the valve cage of the inclined or horizontal well.
San Jack has developed a special sucker rod pump for a submersible linear motor oil extraction system. This pump includes barrel assembly, piston assembly, discharge valve assembly, suction valve assembly, and sand assembly. The structure diagram is as follows:
Intermittent power supply, short power supply time, significantly reduced energy consumption; The working energy consumption of the oil beam and sucker rod of the pumping unit is removed, and the drive of surface pumping unit with the sucker -rod pump is changed into a downhole linear motor to drive the oil directly, and the energy consumption is further reduced!
The new type of pump has a suction valve body between the discharge valve assembly and the suction valve assembly. The suction and discharge valve body is evenly distributed with multiple oil discharge channels in the axial direction and is provided with oil inlet channels in the radial direction.
There is piston assembly in barrel assembly. The piston assembly has a piston and piston ring. The piston is a solid structure, and the piston ring is sleeved on the piston. The piston is directly connected with the power rod because there is no swimming valve cover on the piston.
Therefore, it overcomes the problem that the traveling valve cage of the small-diameter pump is easily broken by alternating load and extends the service life of the pump. Moreover, the piston ring on the piston has automatic compensation for wear, which can extend the optimal pumping time of the pump.