RU2756625C2 - Submersible striction pumping plant - Google Patents

Abstract

FIELD: oil industry.

SUBSTANCE: invention relates to pumping plants; it can be used for pumping liquids from wells. A submersible striction pumping plant consists of a single case and a plunger-type pump, a tubular-type bellows tread, a striction engine of a linear stepper-type, and a tubular-type bellows compensator located in the case. A plunger is located in the rear hole of a pump part of the single case. The plunger is made with the possibility of progressive movement along the longitudinal axis, the front hole of the tread is hermetically sealed with the rear part of the plunger. The rear part of the plunger is connected to the front part of a rod. The tread along the perimeter of its rear hole is hermetically connected to the tread part of the single case. The structure of the striction engine of the pumping plant includes a slider consisting of sequentially connected rear spacer, running and front spacer sections. There are striction actuators in sections. The slider is located inside the engine and is connected to the rod. The compensator is hermetically connected to a compensator part of the single case. The rear hole of the compensator is hermetically sealed with a lid. A cavity formed by internal volumes of the tread, engine and compensator is filled with coolant. A through hole is made in each actuator. A cooling pump is located on the rear spacer section of the slider, which is connected in series with through holes of the actuator in sections. A transverse hole is made in the front part of the rod, connecting the through hole of the rod with the inner cavity of the tread. Inside the compensator, along the longitudinal axis, there is a tube fixed to the slider and hermetically connected to the cooling pump. The rear end of the tube is open into the inner cavity of the compensator.

EFFECT: invention is aimed at reducing the probability of repair due to overheating and failure of striction actuators of the engine of the submersible pumping plant during the pumping of liquid and, as a result, increasing the reliability of its operation.

3 cl, 8 dwg

Description

Technology area

The proposed invention relates to a device for pumping fluids and can be used in industry when pumping fluids from wells. This is required, for example, in pumping oil production, as well as when removing water from wells used for degassing coal seams.

Prior art

From the prior art, a submersible striction pumping unit is known, consisting of a plunger-type pump located in series along an imaginary longitudinal axis in the front-to-back direction, located in the pumping part of a single body, a bellows-type tubular protector located in the tread part of a single body, a linear step-type striction motor, located in the motor part of a single body, a bellows-type tubular compensator located in the compensatory part of a single body (see RF patent No. 2603233, class IPC F04B 17/03, published on November 27, 2016).

The specified pump of the plunger type is made with the possibility of supplying the pumped liquid to the front opening of the pumping part of the single housing. A plunger is located in the rear opening of the pumping part of a single housing along an imaginary longitudinal axis. The plunger is made with the possibility of translational movement along an imaginary longitudinal axis, the front opening of the protector is hermetically sealed by the rear part of the plunger. The rear part of the plunger is connected to the front part of the stem, the protector along the perimeter of its rear opening is hermetically connected to the protector part of the single body along the perimeter of its inner opening.

The striction motor of the said pumping unit includes a runner, which, in turn, consists of a series-connected rear spacer section, a running section, and a front spacer section. Striction actuators are located in the rear strut section, in the running section and in the front strut section of the runner. The runner is located inside the striction motor and is connected to the rear

part of the stock. The runner is made with the possibility of translational movement inside the striction motor housing along an imaginary longitudinal axis.

The compensator in the specified pumping unit along the perimeter of its front opening is hermetically connected to the compensating part of the single body along the perimeter of its inner opening. The rear opening of the compensator is hermetically sealed by a cover, the cavity formed by the internal volumes of the protector, striction motor and compensator is filled with coolant.

The main disadvantage of this technical solution is that the heat released in the striction actuators of the operating striction engine is dissipated into the environment - into the well fluid - mainly from the outer surface of the engine. Due to the small area of heat transfer, striction actuators can overheat and fail.

Thus, the above technical solutions do not solve the problem of preventing overheating of the striction actuators of the striction engine.

Technical task and technical result

The proposed invention is aimed at eliminating the aforementioned drawback and at creating a pumping unit that allows pumping fluid from a well in a favorable temperature regime for the striction actuators of its engine.

The technical result achieved in this case is to reduce the likelihood of repair due to overheating and failure of the striction actuators of the engine of a submersible pumping unit in the process of pumping out the liquid, and, as a consequence, increasing the reliability of its operation.

The essence of the created technical solution

This technical result is achieved when creating a striction submersible pumping unit, consisting of a plunger-type pump located in series along an imaginary longitudinal axis in the direction from front to back, located in the pumping part of a single body, a bellows-type tubular protector located in the tread part of a single body, a linear stepper striction motor type located in the motor part of a single body, a bellows-type tubular compensator located in the compensatory part of a single body.

In this case, the plunger-type pump is configured to supply the pumped liquid to the front opening of the pumping part of the single housing. A plunger is located in the rear opening of the pumping part of a single housing along an imaginary longitudinal axis. The plunger is made with the possibility of translational movement along an imaginary longitudinal axis, the front opening of the protector is hermetically sealed by the rear part of the plunger. The back of the plunger is also connected to the front of the stem. The tread along the perimeter of its rear opening is hermetically connected to the tread part of the single body along the perimeter of its inner opening.

A runner is located inside the striction motor of the pumping unit, which consists of a series-connected rear spacer section, a running section, and a front spacer section. Striction actuators are located in the rear strut section, in the running section and in the front strut section of the runner. The runner is connected to the rear part of the rod and is made with the possibility of translational movement inside the engine along an imaginary longitudinal axis.

The compensator in the pumping unit along the perimeter of its front opening is hermetically connected to the compensating part of the single body along the perimeter of its inner opening. The rear opening of the compensator is hermetically sealed with a cover. The cavity formed by the internal volumes of the tread, the striction motor and the compensator is filled with coolant.

Each striction actuator according to the invention is provided with a through hole having a first outlet and a second outlet. On the rear spacer section of the runner of the striction engine, there is a cooling pump having holes A and B with the possibility of creating a directed flow of coolant from hole A to hole B or from hole B to hole A.

The hole A of the cooling pump is hermetically connected to the first outlet of the through hole of the striction actuator of the rear strut section. The second outlet of the through hole of the striction actuator of the rear strut section is hermetically connected to the first outlet of the through hole of the striction actuator of the running section.

The second outlet of the through hole of the striction actuator of the running section is hermetically connected to the first outlet of the through hole of the striction actuator of the front strut section. An axial hole is made in the stock along an imaginary longitudinal axis, which is blind in its front part. Axial stem bore at the rear

the rod is hermetically connected to the second outlet of the through hole of the striction actuator of the front strut section.

A transverse hole is made in the front part of the rod, connecting the through hole of the rod with the inner cavity of the protector. Inside the compensator, along an imaginary longitudinal axis, there is a tube attached to the runner. This tube is hermetically connected to the hole B of the cooling pump, and the rear end of the tube is open into the inner cavity of the compensator.

Electrostrictive and / or piezoelectric and / or magnetostrictive actuators can be used as striction actuators.

The pump can be additionally equipped with a filter with the ability to filter the coolant.

Brief Description of Drawings

The proposed invention is illustrated by the following graphical images.

FIG. 1 is a general view of a submersible striction pumping unit. Electrical wires not shown.

FIG. 2 is a section along the longitudinal axis of the pumping part of a single body of a submersible striction pumping unit.

FIG. 3 is a section along the longitudinal axis of the front half of the tread portion of a single body. Electrical wires not shown.

FIG. 4 is a section along the longitudinal axis of the rear half of the tread portion of a single body. Electrical wires not shown.

FIG. 5 - runner of a striction motor with piezo actuators as striction actuators. Electrical wires not shown.

FIG. 6 is a section along the longitudinal axis of the motor part of a single housing with piezo actuators as striction actuators. The axes of the through holes of the actuators of the spacer sections are located in the cut plane. Electrical wires not shown.

FIG. 7 is a section along the longitudinal axis of the motor part of a single housing with piezo actuators as striction actuators. Through-hole axes

the actuators of the spacer sections are located perpendicular to the plane of the cut. Electrical wires not shown.

FIG. 8 is a section along the longitudinal axis of the compensatory part of the single body.

Detailed description of the technical solution

A submersible striction pumping unit is shown in FIG. 1. It includes the pumping part 1 of a single body, bounded in front by the end part of the pumping part 2, the front half of the tread part 3 and the rear half of the tread part 4 of the single body, rigidly connected by the end part of the tread part 5, the motor part of the single body 6, limited by the front 7 and rear 8 end pieces, as well as the compensating part 9 of a single body.

In the front part of the plunger-type pump, located in the pumping part 1 of a single housing of the submersible striction pumping unit (Fig. 2), there is an end piece 2. In its through hole, a discharge valve 10 is fixed, and in its rear hole - a cylinder 11. In the rear hole of the pumping station part 1 of a single body along an imaginary longitudinal axis 12 is a plunger 13 having a through axial hole. The plunger 13 is made with the possibility of translational movement along an imaginary longitudinal axis 12. At the front end of the plunger 13, a suction valve 14 is fixed.

The bellows-type tubular protector 15 is located in the front 3 of the protector part (Fig. 3) of a single body. It is protected from damage by a body part, which is a part of the tread part of a single body - a tread tube 16, in which holes 17 are made for the passage of formation fluid. The front opening of the bellows protector 15 is hermetically sealed by the rear part of the plunger 13. A rod is located inside the protector 15 along an imaginary longitudinal axis 12, its front section is marked with 18. The rear part of the plunger 13 is connected to the front section 18 of the rod, with its front part. The protector 15 along the perimeter of its rear opening is hermetically connected to the protector part of the single body along the perimeter of its inner opening, namely, to the front part of the end piece 4 connecting the front 3 and rear 4 tread parts of the single body. In the front section 18 of the rod, transverse holes 19 are made, connecting the axial hole of the rod with the inner cavity of the protector 15. In the rear part of the plunger 13, a transverse

hole 20 connecting its inner axial hole with the inner space of the protector pipe 16 and used to enter formation fluid.

The rear protector part 4 of a single body (Fig. 4) is formed by a current supply pipe 22, which is part of a single body. The current supply pipe 22 is fixed to the end piece of the tread part 5. Inside the end piece of the tread part 5 and the current supply pipe 22, the front section 18 and the rear section 23 of the rod are located. The rear section 23 of the rod is a tube, it is coaxially and hermetically connected to the front section 18 of the rod. A flexible U-shaped cable channel 24 is located inside the current lead pipe 22. One end of the cable channel 24 is fixed to the end piece of the protector part 5, the other end - to the rod. Also fastened to the rod are holders 25 and a sealed cable gland 26. In the current supply pipe 22 there is a cable with power and signal conductors (not shown in Fig. 4), laid in the cable channel 24. The cable channel enters the inside of the current supply pipe 22 through the sealed cable glands 27 in the end piece of the protector part 5. The cable is fixed in holders 25 fixed to the rod. The cable enters the inside of the stem through a sealed cable entry 26 of the rear stem section 23.

The striction motor of the linear stepping type of the pumping unit includes a runner 28 (Fig. 5), which, in turn, consists of a series-connected rear spacer section 29, a running section 30, a front spacer section 31. In the rear spacer section 29, in the running section 30 and in the front spacer section 31 of the runner 28 are striction actuators. FIG. 5 shows striction actuators of piezoelectric type 32.

The runner 28 is located inside the engine and is connected to the rear section 23 of the rod by means of a connecting piece 34 (Fig. 6 and 7). The spacer sections 29 and 31 of the engine are made with the ability to abut with their edges against the friction plates 35 and 36 parallel to these edges (Fig. 6). The friction plates 35 and 36 are rigidly connected to the cheeks 41 and 42 (Fig. 7) and together with the front and rear end pieces 7 and 8 connected to them at the ends (Figs. 6 and 7) form the motor part 6 of a single housing.

Spacer sections 29 and 31 are pulled together into a single unit - runner 28 - by a pin 37 with nuts 38 and 39 at its ends. The runner 28 is made with the possibility of translational movement inside the engine along an imaginary longitudinal axis 12.

In each striction actuator 32, according to the invention, a through hole 43 is made, having a first outlet 44 and a second outlet 45. On the rear spacer section 29 of the runner 28 of the striction motor, a cooling pump 46 is located, having holes A and B with the possibility of creating a directed flow of coolant from hole A to hole B. A variant of the device is possible in which the cooling pump has the ability to create a directed flow of coolant from hole B to hole A.

The hole A of the cooling pump 46 is sealed by a channel 47 with the first outlets 44 of the through holes 43 of the striction actuators 32 of the rear strut section 29. The second outlets 45 of the through holes 44 of the striction actuators 32 of the rear strut section 29 are hermetically connected by the channel 48 with the first outlet 44 of the through hole 43 of the striction actuator 32 undercarriage 30.

The second outlet 45 of the through hole 43 of the striction actuator 32 of the running section 30 is sealed by a channel 49 with the first outlets 44 of the through holes 43 of the striction actuators 32 of the front strut section 31.

The axial hole of the stem in the rear section 23 of the stem is hermetically connected to the second outputs 45 of the through holes 43 of the striction actuators 32 of the front strut section 31 by means of a channel 50 and holes in the connecting piece 34.

The compensator 51 in the pumping unit along the perimeter of its front opening is hermetically connected to the rear end piece 8 of the motor part 6 of the single housing. The end piece 8 is fixed in the protective pipe 52 of the compensating part 9 of the single body along the perimeter of its inner opening. The rear opening of the compensator 51 is sealed with a cover 53.

Inside the compensator 51 along an imaginary longitudinal axis 12 there is a tube 54 fixed on the runner 28. This tube is hermetically connected to the hole B of the cooling pump 46, and the rear end of the tube 54 is open to the internal cavity of the compensator 51. The cavity formed by the internal volumes of the protector 15 of the striction engine and expansion joint 51 filled with coolant.

Electrostrictive and / or piezoelectric and / or magnetostrictive actuators can be used as striction actuators 32.

Cooling pump 46 may additionally be provided with a filter capable of filtering coolant.

The device works as follows. A time-varying electrical voltage is supplied to the striction actuators 32 via a cable (not shown in the drawings).

The plunger 13 of the submersible striction pumping unit during injection and suction is moved along an imaginary longitudinal axis in repeated small steps. When pumping in one step, there are 6 phases. In the first phase, the front spacer section 31 is released in the engine by disconnecting the electric voltage from its striction actuators 32. The corresponding edges of the spacer section 31 stop pressing on the friction plates 35 and 36. In this case, it becomes possible to move the spacer section 31 and the front end of the running striction section 30 along an imaginary axis 12.

The rear strut section 29 is braked in the engine, if it has not been braked, by connecting an electric voltage to its striction actuators 32. In this case, the corresponding edges of the strut section 29 begin to press on the friction plates 35 and 36, blocking the possible movement of the rear end of the running striction section 30.

In the second phase, the running striction section 30 is connected to an electrical voltage source. As a result, its striction actuator 32 increases its length, the front end of the travel striction section 30, and with it the front spacer section 31 move a short distance forward. Together with the front spacer section 31, the rear section 23 and the front section 18 of the rod, as well as the plunger 13 connected to the rod, also move forward.

The suction valve 14 is closed during this movement, providing injection through the open injection valve 10 and the end piece 2 of the formation fluid from the volume enclosed in the cylinder 11 between the injection valve 10 and the suction valve 14.

At the same time, the protector 15 is slightly lengthened, its corrugations move apart relative to each other in the axial direction at the periphery, and formation fluid rushes into the increased gaps between them from the well through the holes 17 in the protector pipe 16. Such movement of the formation fluid leads to its heating due to heat transfer through thin protector membranes 15 from the heated coolant,

filling the inner space of the protector 15 and the engine. The protector 15 acts as a heat exchanger.

The compensator 51 is slightly compressed in length, since the minimum volume of coolant is required to compensate for the increased volume of the internal cavity of the elongated protector 15. From the internal cavity of the compensator 51 into the internal cavity of the engine, and then into the internal cavity of the protector 15, a minimum volume of coolant flows. In this case, the corrugations of the compensator 51 are shifted in the axial direction in the peripheral part, and from the reduced gaps between their outer surfaces, the formation fluid rushes into the well through the holes 55 and the rear opening of the compensator pipe 52. This movement of the formation fluid leads to heat removal due to heat transfer through the thin membranes of the compensator 51 from the heated coolant filling the internal space of the compensator 51 and the engine. The compensator 51 acts as a heat exchanger.

In the third phase, the front spacer section 31 is decelerated in the engine by connecting an electric voltage to its striction actuators 32. In this case, the corresponding edges of the spacer section 31 begin to press on the friction plates 35 and 36 and the possible movement of the front end of the running striction section 30 is blocked.

In the fourth phase, the spacer section 29 is released in the engine by disconnecting the electric voltage from its striction actuators 32. In this case, the corresponding edges of the spacer section 29 cease to press on the friction plates 35 and 36. It becomes possible to move the spacer section 29 and the rear end of the running striction section 30 along imaginary axis 12.

In the fifth phase, the running striction section 30 is disconnected from the electrical voltage source. As a result, its striction actuator 32 decreases its length, the rear end of the running striction section 30, and with it the rear spacer section 29, move a short distance forward. Together with the rear spacer section 29, the cooling pump 46 and pipe 54 also move forward.

In the sixth phase, the rear spacer section 29 is decelerated in the engine by connecting an electric voltage to its striction actuators 32. In this case, the corresponding edges of the spacer section 29 begin to press on the friction plates 35 and 36 and the movement of the rear end of the running striction section 30 is blocked.

Steps from the first to the sixth are repeated until the plunger 13 reaches the extreme forward position in the cylinder 11, that is, until it stops in the end piece 2. After that

absorption occurs. When sucking in one step, there are also 6 phases. They are identical to the injection phases. The only difference is that the electric voltage, which was supplied during pumping to the front spacer section 31, is supplied to the rear spacer section 29 during suction. And the electric voltage, which was supplied to the rear spacer section 29 during pumping, is supplied to the front spacer section during suction. 31.

During suction, the front end of the travel striction section 30, and with it the front strut section 31, is moved step by step backward a short distance. Together with the front spacer section 31, the rear section 23 and the front section 18 of the stem, as well as the plunger 13 connected to the stem, also move backward.

The suction valve 14 is open during this movement, allowing formation fluid to flow into the cylinder 11 between the discharge valve 10 and the suction valve 14. The discharge valve 10 is closed. In this case, the corrugations of the protector bellows 15 are shifted step by step in the axial direction at the periphery, and the corrugations of the bellows of the compensator 51 move apart stepwise in the same way.

Due to the operation of the cooling pump 46, the coolant from the internal volume of the bellows expansion joint 15 through the holes 19 enters the axial hole of the front section 18 of the rod. Next, the coolant enters the axial hole of the rear section 23 of the rod, and through the holes in the part 34 - into the channel 50 in the front spacer section 31.

From the channel 50, the coolant flows through the through holes 43 of all striction actuators 32 of the front strut section 31, taking away excess heat from them and heating up at the same time. Through channel 49, coolant enters the annular gap between the pin 37 inside the travel section 30 and the through hole 43 of its striction actuator 32. Flowing through this gap, it cools the actuator 32 while heating up. After leaving the annular gap in the running section 30, the coolant flows through the channel 48 into the through holes 43 of all striction actuators 32 of the rear spacer section 29, taking away excess heat from them and heating up at the same time. Through the channel 47, the coolant heated in the striction actuators 32 of the runner 28 enters the cooling pump 46, and from it into the tube 54 and into the rear part of the inner cavity of the bellows expansion joint 51.

The movement of the coolant is further directed forward along the inner cavity of the compensator 51 along the pipe 54 into the engine. Inside the engine, the coolant removes heat from the outer surfaces of the striction actuators 32 and partially gives off heat to the friction plates 35, 36 and cheeks 41, 42, which, in turn,

outside they are washed by formation fluid. Next, the coolant flows forward along the inner cavity of the protector 15 along the rod to the holes 19.

The movement of the plunger 13 in the cylinder 11 is accompanied by periodic displacement and expansion of the corrugations of the bellows of the protector 15 and the compensator 51. This promotes heat exchange between the formation fluid that washes the outer surfaces of the bellows of the compensator 51 and the protector 15 and the coolant that washes the inner surfaces of the said bellows.

The device described in this application is applicable in the industry when pumping formation fluid from wells. The invention has been disclosed above with reference to specific embodiments. Other embodiments of the invention may be obvious to specialists without changing its essence, as it is disclosed in the present description. Accordingly, the disclosed invention should be considered limited in scope only by the following claims.

Claims (36)

1. Submersible striction pumping unit, consisting of arranged sequentially along an imaginary longitudinal axis in the direction from front to back and having a single body a plunger-type pump located in the pumping part of a single casing, a bellows-type protector located in the tread part of a single body, a linear stepping type striction motor located in the motor part of a single housing, a bellows-type tubular compensator located in the compensatory part of a single body, a plunger-type pump is configured to supply the pumped liquid to the front opening of the pumping part of a single housing, a plunger is located in the rear opening of the pumping part of a single casing along an imaginary longitudinal axis, the plunger is made with the possibility of translational movement along an imaginary longitudinal axis, the front opening of the protector is hermetically sealed by the back of the plunger, the back of the plunger is connected to the front of the stem, the rod is located inside the protector, the protector along the perimeter of its rear opening is hermetically connected to the protector part of a single body along the perimeter of its inner opening, the striction engine includes a runner, the runner consists of a series-connected rear strut section, a running section, a front strut section, a striction actuator is located in the rear spacer section, a striction actuator is located in the running section, a striction actuator is located in the front spacer section of the runner, the runner is located inside the engine, the runner is connected to the back of the stem, the runner is made with the possibility of translational movement along an imaginary longitudinal axis, the expansion joint along the perimeter of its front opening is hermetically connected to the expansion joint part of the single body along the perimeter of its inner opening, the rear opening of the compensator is hermetically sealed with a cover, the cavity formed by the internal volumes of the protector, striction motor and compensator is filled with coolant, characterized by the fact that a through hole is made in each striction actuator, which has a first outlet and a second outlet, on the rear spacer section of the runner of the striction engine, there is a cooling pump having holes A and B with the possibility of creating a directed flow of coolant from hole A to hole B or from hole B to hole A, hole A of the cooling pump is hermetically connected to the first outlet of the through hole of the striction actuator of the rear strut section, the second outlet of the through hole of the striction actuator of the rear strut section is hermetically connected to the first outlet of the through hole of the striction actuator of the running section, the second outlet of the through hole of the striction actuator of the running section is hermetically connected to the first outlet of the through hole of the striction actuator of the front strut section, an axial hole is made in the stock along an imaginary longitudinal axis, which is blind in its front part, the axial hole of the rod in the rear part of the rod is hermetically connected to the second outlet of the through hole of the striction actuator of the front strut section, a transverse hole is made in the front part of the rod, connecting the axial hole of the rod with the inner cavity of the protector, inside the compensator along an imaginary longitudinal axis there is a tube attached to the runner, the tube is hermetically connected to the B port of the cooling pump ,, the rear end of the tube is open into the inner cavity of the compensator. 2. Submersible striction pumping unit according to claim 1, characterized in that electrostrictive and / or piezoelectric and / or magnetostrictive actuators are used as striction actuators. 3. Submersible striction pump installation according to claim. 1, characterized in that the cooling pump is equipped with a filter made with the possibility of filtering the coolant.

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