RU2518762C1 - Multistage immersion vibratory pump with axial connection - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: device housing consists in section cases 1, 2. Pump section has inlet valve 3 with its own body. Disc piston 5 is fitted at rod 6 engaged with electromagnet armature 7 integrated with vibrator. Plate spring 9 is used as the armature return mechanism arranged in oil-filled chamber 10 to compensate for external pressure. Pump sections are interconnected by pipelines 11. Upper outlet part of pipeline 11 features the shape of diffuser 12 accommodating the inlet of inlet valve of the next pump section. Inlet valve of every section has intrinsic body threaded to pump section housing to allow the suction chamber volume. Seat with ball is fitted in the valve body. Electromagnet windings and control signals are fed via multiple-strand armoured cable 17.

EFFECT: lift of formation fluid from 3 km deep wells, power savings.

3 cl, 2 dwg

Description

The invention relates to hydraulic machines and for submersible pumps for lifting formation fluid from depths from 300 m to 3000 m from wells with casing pipes perforated in the formation.

Known designs of submersible centrifugal pumps, including multi-stage. So, in the RF patent for the invention No. 2163693 [RF patent No. 2163693, publ. 02.27.2001, patent holder of OJSC “Borets”] describes a submersible centrifugal multistage pump containing a housing in which a shaft with impellers is mounted, supported by radial and axial bearings. The pump shaft consists of several sections, successively abutting the ends one against the other and interconnected by splined couplings, and placed in a single housing, and the axial bearing mounted on the lower section of the shaft. The pump described in RF patent No. 2163693 has inherent disadvantages of centrifugal pumps: low efficiency, manufacturing complexity (casting of the casing with flow channels), severe restrictions on solid impurities, etc.

These disadvantages are partially eliminated in the known designs of vibration pumps. Household submersible vibration pumps are widely known, for example, "Kid", "Trickle" [see http://www.hms-pumps.ru/art/articles/category/l/message/37/]. An electromagnet is installed in the body of the vibration pump, consisting of a core and a winding, the coils of which are flooded with a compound, as well as a vibrator, which includes an armature with a rod pressed into it, at the end of which a disk piston is fixed. A rubber gasket is installed on the stock - a shock absorber. A rubber diaphragm is installed at a distance from the shock absorber, separating the hydraulic chamber from the electric one and at the same time acting as an additional support for the piston. The inlet, distributed around the circumference, closes the valve, made in the form of a washer mounted on an axial shaft and equipped with a rubber seal. Other vibrational submersible pumps described above have a higher efficiency, are less sensitive to solid impurities, but have pressure limitations.

As a prototype of the selected deep two-stage vibration pump described in the patent of the Russian Federation No. 2386056, having a one-way connection. Two pump stages are installed in a common housing. Each stage of the pump consists of two electromagnets containing yoke and coils, which create electromagnetic forces directed in different directions. Anchors of electromagnets are mounted on rubber shock absorbers. A glass and rubber shock absorbers form a working chamber. In the glass there are suction and discharge valves. The second stage of the pump has a similar design, but the force created by the stiffness of rubber-metal shock absorbers exceeds the force of the same shock absorbers in the first stage by the amount of force created by the fluid pressure obtained in the first stage. The first and second stages of the pump are installed and centered in the housing through the inserts. The discharge cavity of the first stage of the pump is connected to the suction cavity of the second stage by means of a pipeline. The pump stages are fixed in the housing by a cover through which the discharge pipe is led out and in which a hole is made for fluid intake to the suction valve of the first pump stage. The pump was powered from a half-period AC rectifier, where the electromagnets of the first stage were fed from one half-wave, and electromagnets of the second stage were fed from the second half-wave. A two-stage pump allows you to create a head up to 100 m, but has a complex structure. The principle of two-way valve systems (suction and discharge valves at each stage) used in piston pumps is applied in this vibration pump. This is also a disadvantage, as piston pumps, unlike vibrational pumps, have a fairly large piston stroke, so they have the ability to provide a clear time positioning of the intake and exhaust valves, which is not possible in the described design. In addition, the prototype excluded the possibility of increasing the number of steps to increase the pressure.

Thus, there is a technical contradiction - on the one hand, well-known centrifugal pumps allow pumping formation fluids from great depths, but have a limitation on solid impurities and low efficiency, on the other hand, well-known vibration pumps that have lower energy consumption and are less sensitive to impurities, do not allow pumping liquids from great depths.

The basis of the invention is the task of resolving this contradiction and creating a new design of the deep pump, that is, the task of expanding the arsenal of funds. Achievable technical result - providing the ability to raise formation fluid from wells, up to 3 km deep, with relatively low energy consumption.

The problem is solved by changing the design.

An axial-connected multistage deep vibration pump has series-connected pump sections, the housings of which form a common integral pump housing. Each pump section has an inlet valve, a disk piston mounted on a rod connected to an electromagnet armature. The anchor of the electromagnet is placed in an oil-filled cavity and is equipped with a return mechanism made in the form of a Belleville spring. The inlet valve of each pump section is made of a ball with an axially spring-loaded ball.

The pump sections are interconnected by pipelines, the outlet of each of which has the shape of a diffuser, in which the inlet of the valve of the subsequent section is located. The volume of the suction chamber in each subsequent section is less than in the previous one. This can be achieved by the fact that the inlet valve housing is connected to the pump section housing by means of a threaded connection, which makes it possible to adjust the height of this chamber and, consequently, the volume. Pump sections are connected to ensure that their operation is in phase, which is ensured by an electrical control system.

In order to better demonstrate the distinguishing features of the invention, as an example, not having any restrictive nature, the preferred embodiment is described below.

An example implementation is illustrated by the figures of the drawings, which show: Figure 1 is a General view of the pump (longitudinal axial section), Figure 2 is a view A in Figure 1, enlarged (intake part of the pump) with a ball valve.

The inventive pump may have up to one hundred or more sections. The first and second pump sections have bodies 1 and 2, respectively. The first pump section has an inlet valve 3 having its own housing 4. The disk piston 5 is mounted on the rod 6, which is connected to the armature 7 of the electromagnet 8, which is part of the vibrator. As the return mechanism of the anchor 7 (and therefore the rod), there is a disk spring 9, the peripheral part of which is fixed motionless, for example, in the elements of the housing. The anchor 7 of the electromagnet is placed in the oil-filled cavity 10, which provides compensation for external pressure. The pump sections are interconnected by pipelines 11. The upper output part of the pipe 11 has the shape of a diffuser 12, in which the inlet part of the inlet valve of the next pump section is located.

The inlet valve of each section has its own body, which is threadedly connected to the body of the pump section, which allows you to adjust the volume of the suction chamber (the volume under the disk piston) of the section and use sections of a unified design. In the valve body 4, a seat 13 is installed with a backflow restrictor - ball 14, which is made of tungsten carbide to increase its service life. The ball 14 is axially spring-loaded by means of an anti-inertia spring 15 mounted on a guide rod 16 fixed to the valve body 4. The power supply to the windings of the electromagnets and control signals is carried out through a multicore armored cable 17.

Normal operation of the pump is ensured by the in-phase oscillations of the anchors of each of the pump sections, stability is constantly monitored by the controller, as well as a guaranteed regulated decrease in the volume of the suction chamber from section to section.

The pump is as follows.

When a positive impulse is applied to the electromagnets 8, all the anchors 7 are simultaneously retracted, opening the valves simultaneously using the disk pistons 5 due to the fluid continuity and together moving upward portions of the reservoir fluid from the lower pump sections to the upper ones along the entire length of the pump. Carried by the fluid, the balls 14 compress the springs 15. The Belleville springs 9 also compress. The diffusers 12 serve as an adapter for a larger diameter of the outlet part of the pipeline - to accommodate the inlet valve of the next section. In addition, there is a slight pressure drop in the diffusers necessary to ensure better absorption of the liquid.

With a negative voltage pulse, Belleville springs 9 return the disc pistons 5 to their original position. Balls 14 also return to their original position, closing the valve, if necessary, an anti-inertia spring 15 is activated. Then the cycle repeats. The increase in pressure from section to section occurs due to the fact that the volume under the disk piston (suction chamber) in each subsequent section is less than in the previous one.

Pumps of the claimed design have been successfully tested. With 40 sections and a power consumption of 30 kW, the pressure was up to 3000 m.a., efficiency of at least 55%. Tests also showed that the pump is not sensitive to impurities with a characteristic particle size of 0.3 mm. Belleville springs and wear-resistant balls made of tungsten carbide provide long-term performance of the device at high loads.

Claims (3)

1. A multi-stage deep vibration pump with axial connection, characterized in that it has series-connected pump sections, the housings of which form a common integral pump housing, each pump section has an inlet valve, a disk piston mounted on a rod connected to an electromagnet armature and equipped with a mechanism return, made in the form of a disk spring, while the inlet valve of each pump section is made ball with an axially spring-loaded ball, the pump sections are connected interconnected by pipelines, the outlet of each of which has the shape of a diffuser, in which the inlet of the valve of the next section is located, the volume of the suction chamber in each subsequent section is less than in the previous one, the pump sections are connected to ensure that their operation is in phase. 2. The multi-stage deep vibration pump according to claim 1, characterized in that the armature of the electromagnet is in an oil-filled chamber. 3. The multi-stage deep vibration pump according to claim 1, characterized in that the inlet valve has a housing connected to the housing of the pump section using a threaded connection.

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