RU2422676C2 - Submersible plunger pump unit and its linear electric motor - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: device is intended for oil lifting from wells and can be used for pumping-out of formation water and mining operations of underground mineral resources laid at big depths in liquid state. Device includes housing (1), electric motor (2), stock (7), plunger (8), cylinder (10), inlet and outlet valves (12, 13), drain electromagnetic valve (18), which are connected to tubing string (14). In bilateral unit cooled with pumped liquid with linear electric motor (2) cooled with dielectric liquid there installed is the second plunger (9), the second cylinder (11) and the second pair of valves (15,16). Linear electric motor (2) includes housing (3), double-ridge stator (4), the secondary element (7). Secondary element (7) is made from electrically conducting long multi-layer plates (21) with transverse slots (22) offset relative to each other and filled with dielectric material.

EFFECT: controllability of efficiency from zero to maximum, absence of mechanical transmissions and bearings; increasing service life, reducing life between overhauls, energy consumption, prime cost, and providing uniform outlet liquid flow and thrust increase.

5 cl, 4 dwg

Description

The invention relates to the field of engineering, and in particular to equipment used in a limited space, for example, underground equipment for lifting oil from wells, and can be used for pumping formation water and mining various minerals that are underground at great depths in a liquid state.

A linear electric motor is used in the installation of a submersible plunger pump, and can also be used in other areas of technology: robotics, as a traction drive in vehicles (without liquid cooling).

Known for the short-term operation of the well by a submersible installation of a vane pump with an electric drive with a capacity of more than 80 m / day, consisting of adjusting the pressure when pumping fluid from the well, of changing the speed of the pump so that the pump efficiency in the entire control range was at least 0.9 maximum the efficiency values for a given rotation speed, the alternation of fluid accumulation in the well with the unit turned off, while the duration of the well operation period is equal to the total The duration of fluid pumping from the well and the duration of fluid accumulation in the well corresponds to a reduction rate of not more than 0.95, and the unit operating time is equal to the ratio of the duration of fluid pumping from the well to the duration of the well operation period of less than 50% (RU No. 2293176 C1, 02/10/2007) .

A disadvantage of the known installation during the short-term operation of low-production wells is a large range of changes in the dynamic fluid level in the well, periodically created depression negatively affects the operation of the oil reservoir, pulls water and heavy impurities into the bottom-hole zone. Short-term well operation has a positive effect only with partial cleaning of the bottom-hole zone during well development, and not for regular commercial operation. A well-known installation pays off for low-production, long-operating wells after a long time, as it is more idle than it works, it consumes more power, and short-term switching on causes uneven load on the electric network.

A known installation is a pumping screw rod containing a ground-based electric drive, a rod string connected to a screw located eccentrically relative to the axis of rotation inside another elastic screw with an internal groove in increments of two times greater than the first screw connected through bearings to a housing fixed to the end of the tubing string with an outlet valve (manufactured by Izhevsk Oil Engineering Plant OJSC).

A disadvantage of the known installation is a small overhaul period due to wear of the elastic screw in the presence of solid particles in the pumped liquid: sand, drilling filtrate, etc., as well as the presence of bearings. A rotating curved rod string causes complications in deviated and horizontal wells and reduces installation efficiency.

A known installation is a pump screw, containing a submersible motor connected through a start-up clutch to a screw located eccentrically relative to the axis of rotation inside another elastic (rubber) screw with an internal groove with a step twice as large as that of the first screw connected through bearings to the housing, fixed at the end of the tubing string with an outlet valve (VI Kudinov, “Fundamentals of Oil and Gas Production”, Izhevsk, 2005, p. 366).

A disadvantage of the known installation is a small overhaul period due to wear of the elastic screw in the presence of solid particles in the pumped liquid: sand, drilling mud, etc., as well as the presence of bearings.

A known piston pump installation containing a submersible motor connected via a starting clutch to a gearbox made in the form of a planetary gear containing a pinion gear mounted on the shaft, satellites mounted on the carrier and a driven wheel, while the carrier has two fixed switchable positions with free the stroke relative to the stationary housing and the rotating drive shaft, and the driven wheel is rigidly connected to the outer race of the screw bearing of the swing of the rotary motion transducer I shaft in the reciprocating movement of the rod, made in the form of a screw pair, between the turns of which there are rollers or balls, and the rod is made in the form of an inner race of this bearing and has guides for the translational motion bearing, which is connected to the piston containing the damper, while the rod is connected to the thrust, a tension-compression spring, a thrust double-sided bearing, connected to guides located in the carrier, connected to the ends with two end gears, which engage with two washing with other identical end gears, each of which is located on elastic couplings, fixed one in the housing for the working stroke, and the other on the drive shaft for idling, the piston moves in the cylinder, which is connected to the tubing string with the input and output valves (RU 2008102056 C1, 07.27.2009).

A disadvantage of the known installation is the presence of mechanical transmission, gears, swing bearings, which reduces reliability, service life, i.e. the overhaul period (MCI), the presence of a free stroke of the plunger, which reduces the efficiency of the installation, as well as the inability to adjust the performance of the installation in a wide range.

Known diaphragm plunger submersible pump installation containing a submersible motor connected to a bevel gear, a diaphragm, a plunger with a return spring located in a chamber filled with oil, a housing with a drain solenoid valve and inlet and outlet valves connected to the tubing (EDN- 5, manufactured by Izhevsk Electromechanical Plant OJSC, Potek CJSC),

A disadvantage of the known installation is the presence of mechanical transmission, gearing, rolling bearings, which reduces reliability, service life, i.e. overhaul period (MCI), the presence of a free stroke of the plunger, which reduces the efficiency installation, as well as the inability to regulate the performance of the installation in a wide range, which increases the range of pumps (EDN-5-4-200, EDN-5-6.3-1500, EDN-5-8-1300, EDN-5- 10-1200, EDN-5-12.5-900, ZDN-5-16-750, EDN-5-20-600) and when changing the flow of fluid in the well, it becomes necessary to carry out tripping work to replace the pump.

Also known is a pump plunger installation, submersible, consisting of a housing, a submersible electric motor, comprising a housing, a stator and a rotor connected through a cavity filled with oil, with a rod, plunger or piston moving in a cylinder with seals, rigidly connected to an inlet valve in front of which is installed a drain solenoid valve, and an outlet valve connected to the tubing (G.I.Izhel et al. Linear induction motors. Technique, Kiev, 1975, p. 116, Fig. 54).

The objective of the invention is the creation of an installation without mechanical gears, gears and bearings, an increase in the overhaul period (MCI) and efficiency, the ability to adjust performance from almost zero to a maximum value.

The technical result achieved as a result of the task is to increase the service life, i.e. the overhaul period (MCI), increased efficiency, the ability to control performance over a wide range, reduced labor costs and production costs and energy costs during operation.

The specified technical result is achieved by the fact that in the installation of a submersible pump plunger, consisting of a housing, a submersible electric motor containing a housing, a stator and a rotor connected through a cavity filled with oil, with a rod, plunger or piston moving in a cylinder with seals connected rigidly to the inlet valve, in front of which a drain solenoid valve is installed, and the outlet valve connected to the tubing, the electric motor is linear, and its secondary element is the role of the stem, and also introduced a second plunger, identical to the first, connected to the second end of the secondary element, and a second cylinder, rigidly connected to the second pair of valves, located in the installation casing with through cavities connecting the output of the second output valve to the output of the first output valve, and the cavity between the seals of the first cylinder and plunger or piston and the second cylinder and plunger or piston, including the internal volume of the electric motor, is filled with dielectric fluid, while the cross-sectional area The secondary element and plunger are equal or different from each other depending on the calculated volume of the liquid washing the internal parts of the electric motor for heat transfer through the housings into the through cavities filled with the pumped liquid, while the intensity of washing off the components of the electric motor and the plunger space by dielectric liquid is directly proportional to the speed of movement secondary element with plungers or pistons.

The second plunger and cylinder are introduced to exclude free play in the pump installation, since the first and second plungers work alternately. Through cavities between the installation housing and the motor housing, the body of the first and second cylinders are introduced to connect the output of the second output valve to the output of the first output valve to move the pumped fluid, which cools the motor housing and the cylinder body. The linear electric motor and the volumes behind the plungers are filled with dielectric fluid, for example, transformer oil to cool the elements heated during operation: inductors, secondary element and plungers, when the seals rub against the surface of the plungers.

The plunger and cylinder are flattened to reduce installation length, since in this case the ends of the secondary element will move in the inner regions of the flattened cylinders.

Known linear electric motor, consisting of a comb-mounted inductor, a secondary element, consisting of a number of permanent magnets installed in the power building ("Servotekhnika", Dolgoprudny, Moscow region)

A disadvantage of the known linear electric motor is the dimensions and design, which do not allow it to be placed in the tube space, as well as low power.

A linear electric motor is known, consisting of a comb-type inductor, a secondary element, consisting of a series of permanent magnets made by spraying a quartz plate mounted in a power housing with a guide, and a magnetic circuit (Japan, SodikM-Center CJSC, Moscow, e-mail: info@sodik.ru).

A disadvantage of the known linear electric motor is the dimensions and design, which do not allow it to be placed in the tube space, as well as low power.

A linear electric motor for driving submersible plunger pumps is known, comprising a cylindrical inductor with a multiphase winding made axially movable and mounted inside a steel secondary element, the steel secondary element is an electric motor housing, the inner surface of which has a highly conductive coating in the form of a copper layer, and a cylindrical inductor made of several modules, recruited from phase coils and interconnected by a flexible connection, the number of cylinders of the phase inductor is a multiple of the number of phases of the winding, and during the transition from one module to another, the phase coils are stacked with a successive change in the location of the individual phases (RU 2266607 C2, 20.12.2005).

A disadvantage of the known linear electric motor is its small specific power due to the large scattering of the electromagnetic field, which is scattered to the outside, into the motor housing, on the inner copper surface of which Foucault eddy currents are also induced, which reduce the efficiency of the electric motor, and there is also no heat sink.

Known linear electric motor, consisting of a double comb stator, a secondary element made of short-circuited electrically conductive material, a control unit (Patent RU No. 2086069 C1, 07.27.1997).

A disadvantage of the known linear electric motor is insufficient traction.

The objective of the invention is to increase the thrust of a linear motor. The technical result achieved as a result of the task is to increase traction.

This technical result is achieved in that in a linear electric motor consisting of a double comb stator, a secondary element made of short-circuited electrically conductive material, a control unit, the secondary element is made in the form of long multilayer plates with transverse slots offset relative to each other, filled with a solid dielectric, fixed in the power housing and isolated from each other and from the power housing of the secondary element.

Electrically conductive insulated tires are installed in electrical contact with the plates on the long sides in the power housing of the secondary element, having a longitudinal resistance much greater than the resistance of a portion of parallel plates between slots opposite a pair of spring-loaded contacts sliding along the bus, which are located axisymmetrically between each pair of coils on the housing stator and which are connected in pairs between each other, forming a parallel-series electrical circuit so that currents, passing through the plates always cause Ampere forces whose vectors are directed in one direction.

Tires are introduced to combine the plates with the long sides in a parallel-serial electric circuit in which the tires in the longitudinal direction have a much greater resistance than in the transverse with parts of parallel plates between the slots located opposite the sliding contacts. Sliding contacts are introduced to transfer current to the secondary element, to increase traction and reduce current surges when the load changes (with additional well-known electric motor control units) moving along the bus without sparking, since the bus has no gaps and contact is made in a dielectric fluid.

The power and control cable passes through the body of the cylinder and valves to reduce installation dimensions.

The invention is illustrated by drawings, in which Fig. 1 shows a diagram of an installation of a submersible pump plunger and its linear motor, Fig. 2 shows a cross section of a flattened plunger in a cylinder, Fig. 3 shows a cross section of a linear motor of a prototype installation, and Fig. 4 shows secondary element of a linear electric motor with sliding contacts and slots, Fig. 5 secondary element of a linear electric motor in the plane of inductors with offset slots filled with a dielectric.

The submersible plunger pump installation consists of a housing 1, a linear electric motor 2, consisting of a housing 3, a two-stator stator 4, consisting of two comb cores of ferromagnetic material 5 and inductors 6, a secondary element 7, the ends of which are rigidly connected to the plungers 8 and 9, moving in the cylinders 10 and 11, respectively, which are connected respectively to two pairs of valves: inlet 12 and outlet 13, connected to the tubing 14, and inlet 15 and outlet 16, rigidly connected with a cylinder 11 at the end of the installation, the output valve 16 being connected to the output of the first output valve 13 through cavities 17 passing between the housing 1 of the installation and the second pair of valves 15 and 16, cylinder 11, housing 3 of the linear motor 2, cylinder 10. Before the first inlet valve 12 has a drain solenoid valve 18. The internal space of the installation between the seals 19 of the plungers 8 and 9, including the electric motor, is filled with dielectric fluid 20, through which heat is removed from the heated x the internal components of the linear electric motor 2. The velocity of the fluid 20 relative to the stationary elements being washed: inductors 6, comb cores 5, etc. depends on the cross-sectional area of the plunger 8, 9 and the cross-sectional area of the washer fluid flow 20.

The plungers 8 and 9 and the cylinders 10 and 11 in the cross section are flattened so that the ends of the secondary element 7 move in the inner regions of the flattened cylinders 10 and 11. The large axis of the cross sections of the cylinders 10 and 11, the plungers 8 and 9 and the secondary element 7 are located in one plane.

Linear electric motor 2 consists of a housing 3, a two-stator stator 4, consisting of two comb cores of ferromagnetic material 5, inductors 6, a secondary element 7, consisting of long multilayer electrically conductive plates 21 isolated from each other with transverse slots 22 that are offset relative to each other and are filled with a solid dielectric. Multilayer plates are rigidly connected by long sides through insulation with a power housing in the form of two rods 23, also rigidly connected by their ends to each other.

Long multilayer plates 21 with transverse slots 22 of the secondary element 7 are closed by long busbars 24 isolated from the power casing and fixed between two power rods 23. On the tires 24 between each pair of coils 6 there are two electrically conductive spring-loaded contacts 25 mounted on the motor housing 3, which are interconnected in parallel in series so that in the electromagnetic field the currents in the multilayer plates 21 with transverse slots 22 cause the appearance of force vectors s Amperes coinciding in direction. Contact sensors are installed inside the engine to control phase switching to change the direction of movement of the secondary element.

The device operates as follows.

The moment of force from the linear electric motor 2, the secondary element 7, moving reciprocating, is transmitted by the plungers 8 and 9, while the plunger 8 moves up - the stroke, and the plunger 9 up - idle, the first inlet valve 12 is closed, and the first outlet valve 13 is open, and the second inlet valve 15 is open, the second outlet valve 16 is closed, and the liquid from the first cylinder 10 is displaced through the valve 13 into the internal cavity of the tubing 14, and also fills the second cylinder 11. During the reverse stroke, when the secondary element 7 P moves down together with the plungers, the first plunger 8 makes an idle stroke, and the second plunger 9 moves, the first inlet valve 12 is open and the first inlet 13 is closed and the second inlet valve 15 is closed, the second outlet valve 16 is open and the liquid from the second cylinder 11 is displaced into the through cavity 17 between the installation housing 1 and the second pair of valves 15 and 16, the second cylinder 11, the linear motor housing 3, the first cylinder 10, then into the internal cavity of the tubing 14, and the first is also filled with liquid qi cylinder 12. Thus, an almost uninterrupted flow of the pumped liquid takes place, with the exception of short-term moments of changing the direction of movement of the plungers 8 and 9, which, when moving, washes the housing 3 of the linear electric motor 2 and the cylinders 10 and 11, taking part of the heat from them. The dielectric fluid 20, filling the space between the seals 19 of the plungers 8 and 9, during the reciprocating movement of the secondary element 7 with the plungers 8 and 9, washes the two-row stators 4 and the secondary element 7, which are heated during operation. The speed of movement of the dielectric fluid 20 in the linear electric motor 2 depends on the cross-sectional area of the plungers 8 and 9, the secondary element 7, their speed of movement and the throughput free cross-sectional area filled with the dielectric fluid.

Vzh = (Spl-Svt) Vvt / Szh,

where Vzh is the velocity of the dielectric fluid;

Spl - cross-sectional area of the plunger;

Swt is the cross-sectional area of the secondary element;

Vw - the speed of movement of the secondary element with plungers;

Szh - throughput free cross-sectional area of the liquid.

The engine operates as follows. When a three-phase voltage is applied to the motor windings 2 in the secondary element 7, currents are induced on the electrically conductive long multilayer plates 21 with transverse slots 22, as a result of the interaction of which with the field of coils 6, a force arises that drives the secondary element 7 (with a fixed two-rib stator) or a two-rib stator 4 (with a fixed secondary element 7).

Claims (5)

1. Installation of a submersible pump plunger, consisting of a housing, a submersible electric motor, comprising a housing, a stator and a rotor connected through a cavity filled with oil, with a rod, plunger or piston moving in a cylinder with seals, rigidly connected to an inlet valve in front of which is installed a drain solenoid valve, and an output valve connected to the tubing, characterized in that the electric motor is linear, and its secondary element acts as a rod, and also introduced a swarm plunger, identical to the first, connected to the second end of the secondary element, and a second cylinder, rigidly connected to the second pair of valves, located in the unit body with through cavities connecting the output of the second output valve to the output of the first output valve, and the cavity between the seals of the first cylinder and the plunger or piston and the second cylinder and the plunger or piston, including the internal volume of the electric motor, is filled with dielectric fluid, while the cross-sectional area of the secondary element and the plunger the gers are equal or different from each other depending on the calculated volume of the fluid washing the internal parts of the electric motor for heat transfer through the housings into the through cavities filled with the pumped liquid, while the intensity of washing off the components of the electric motor and the plunger space by dielectric fluid is directly proportional to the speed of the secondary element with plungers or pistons. 2. The submersible pump plunger installation according to claim 1, characterized in that the plungers or pistons and cylinders are flattened, in which the large axis of the cross sections and the same axis of the secondary element of the electric motor lie in the same plane. 3. Installing a submersible plunger pump according to claim 1, characterized in that the power and control cable of the linear electric motor passes through the cylinder body and the housing of the first pair of valves. 4. A linear electric motor consisting of a double comb stator, a secondary element made of short-circuited electrically conductive material, a control unit, characterized in that the secondary element is made in the form of long multilayer plates with transverse slots offset from each other, filled with a solid dielectric, fixed in power case and isolated from each other and from the power case of the secondary element. 5. The linear electric motor according to claim 4, characterized in that electrically conductive insulated tires are installed in electrical contact with the plates with long sides in the power housing of the secondary element, having a resistance in the longitudinal direction much greater than the resistance of a portion of parallel plates between the slots opposite a pair of sliding along bus spring-loaded contacts, which are located axisymmetrically between each pair of coils on the stator housing and which are connected in pairs with each other, forming a parallel-last a consistent electrical circuit in such a way that currents passing through the plates always cause Ampere forces, whose vectors are directed in one direction.

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