RU2172867C1 - Well sucker-rod pump - Google Patents

Abstract

FIELD: oil gas producing industry. SUBSTANCE: mounted on upper and lower parts of plunger are clutches with stacks including pairs of magnetic rings magnetized in radial direction and oriented relative to each other in direction opposite to magnetizing and paramagnetic gaskets. Gap between plunger and cylinder is filled with ferromagnetic fluid, viz.: suspension containing ferromagnetic particles made from material possessing high saturation induction. EFFECT: enhanced reliability; increased service life of pumps. 2 cl, 2 dwg

Description

 The invention relates to techniques for oil production and can be used in the oil and gas industry for well operation.

 A well-known sucker-rod pump containing a cylinder, a plunger, equipped with a number of magnetic rings sequentially installed on its outer surface (ed. St. SU N 721558, class F 04 B 47/00, 1980).

 The disadvantage of the pump is its low efficiency, due to leakage through the gap between the cylinder and the plunger at high pressures.

 Closest to the proposed technical solution is a borehole sucker rod pump including a cylinder with a suction valve, a plunger with a discharge valve located in the cylinder with a clearance, pairs of magnetic rings with ferromagnetic fluid, diamagnetic gaskets (autostart SU N 1642067, class F 04 B 47/00, 1991).

 A disadvantage of the known sucker rod pump is the lack of reliability, low efficiency and design complexity.

 The objective of the proposed technical solution is to increase reliability, efficiency and simplify the design.

 The problem is solved in that in a known borehole sucker rod pump including a cylinder with a suction valve, a plunger with a discharge valve located in the cylinder with a clearance, pairs of magnetic rings with ferromagnetic fluid, paramagnetic gaskets, magnetic rings in pairs are magnetized in the radial direction and oriented relative to each other each other in the opposite direction of magnetization, paramagnetic gaskets are located between the magnetic rings, pairs of magnetic rings with paramagnetic gaskets are connected s in packages and installed on the couplings arranged at the top and bottom of the plunger, and the ferromagnetic fluid placed in the gap between the plunger and the ferrofluid as a slurry containing particles of ferromagnetic material with a high saturation induction.

 The location of the magnetic rings in pairs magnetized in the radial direction and oriented relative to each other in the opposite direction of magnetization enhances the effect of magnetic lines of force, which reduces the leakage of fluid through the gap of the plunger-cylinder pair.

 The location of the paramagnetic gaskets between the magnetic rings improves the conditions for protecting them from demagnetization.

 Connecting pairs of rectangular magnetic rings with paramagnetic gaskets and installing them on couplings located on the upper and lower parts of the plunger simplifies the design, increases the reliability and efficiency of the pump.

 Ferromagnetic fluid, which is used as a suspension containing ferromagnetic particles from a material with high saturation induction, also helps to close the gap between the plunger and the cylinder, which increases the efficiency and also increases the life of the pump.

 The drawing schematically shows a borehole sucker rod pump, a longitudinal section.

 The pump contains a working pair of cylinder 1 - plunger 2, in which the suction 3 and discharge 4 valves are respectively located. On the plunger above the discharge valve and under the cage in the upper part, couplings 5 are installed, on which annular permanent magnets 6 are placed, separated by gaskets of non-magnetic material 7. Magnets 6 have a simple geometric shape, convenient for manufacturing. Magnets are installed in pairs with the opposite direction of magnetization and are separated from the plunger by a sleeve 8. In the gap between the cylinder and the plunger, a ferromagnetic fluid 9 is introduced into the gap of the magnets in the form of a suspension of small ferromagnetic particles in a mineral oil of a certain viscosity made of a material with high saturation induction.

 The pump operates as follows. Permanent rectangular magnets mounted on the plunger create a magnetic field in the gap between the cylinder and the plunger, the intensity of which is determined by the residual induction of the magnets used. When a ferromagnetic fluid is introduced into this field, the ferromagnetic particles, being magnetized and oriented in the field, adhere to each other and close the gap. When the plunger moves, the orientation of the ferromagnetic particles is maintained and the gap in the pair remains closed. The closure of the gap is affected by the density of particles in the magnetic fluid and the material from which these particles are made. The magnetic field strength is determined by the value of the residual induction of the material from which the permanent ring magnets are made.

 The application of the proposed borehole sucker rod pump allows to increase the service life and increases the reliability and efficiency of the pump.

Claims (2)

 1. A sucker rod pump comprising a cylinder with a suction valve, a plunger with a discharge valve located in the cylinder with a clearance, pairs of magnetic rings with ferromagnetic fluid, paramagnetic gaskets, characterized in that the magnetic rings in the pairs are magnetized in the radial direction and oriented relative to each other in in the opposite direction of magnetization, paramagnetic gaskets are located between the magnetic rings, pairs of magnetic rings with paramagnetic gaskets are connected in packages and mounted on couplings located on the upper and lower parts of the plunger, and ferromagnetic fluid is placed in the gap between the plunger and the cylinder.  2. The pump according to claim 1, characterized in that a suspension containing ferromagnetic particles from a material with a large saturation induction is used as a ferromagnetic fluid.