RU189932U1 - Pump unit for well operation - Google Patents

Abstract

The utility model relates to the oil industry, in particular to well pumping units operating simultaneously several layers, using one well. Installation for the operation of the reservoir wells, containing a tubing string, a packer designed for installation between the layers, a pump for pumping the products of the layers and a valve with a shut-off element in the form of a rod, also installed in the seal housing, an electromagnetic actuator that provides for the propulsion of a rod that provides hydraulic Communication with other formations. The rod is made with a retainer, ensuring the fixation of the rod in extreme positions. EFFECT: increased reliability and service life of the pumping unit while eliminating the need to maintain the electric actuator of the rod in the on state during the movement of the rod to the extreme positions and when the rod is fixed in these positions. 2 hp f-ly, 6 ill.

Description

The utility model relates to the oil industry, in particular to well pumping units operating simultaneously several objects.

Known installation for simultaneous-separate operation of two objects, containing electric submersible pump and casing (see R.A. Maksutov and others. Simultaneous separate operation of multilayer oil fields. M .: Nedra, 1974, p. 106-107).

The presence of two pumps compared to one pump leads to a significant increase in the cost of installation and characterizes this design difficult, leading to labor-intensive technology descent .. In a well with a small diameter it is necessary to lower not one but two installations of small diameter, this leads to a decrease in design reliability and efficiency , since the efficiency of one installation is always more than two for the same useful total power.

Known installation, containing a column of elevator pipes, packers, electric submersible pump with an input module and electric motor (see A. Silash. Oil and gas production and transport, part 1. M .: Nedra, 1980, p. 364, rice 4.1-105).

The installation is also characterized by the complexity of the design, its assembly at the well due to the need to place the electric submersible pump in the casing at the wellhead and to place the cable sealing unit in the packer, the need to use another (sucker-type) pump to operate two objects and the ability to operate only two objects.

It is known equipment simultaneous-separate operation of the pump of two layers through one well, separated in the wellbore by a packer, the tip of which is tightly articulated with a pipe liner located under the pump. Moreover, a shut-off valve is integrated in the shank, the shut-off element of which, being simultaneously an anchor of its driving electromagnet, by an electrical signal from the wellhead closes the hydraulic channel of the pump tubing through which the fluid enters the pump from a single disconnected packer into the pump and then into the ground installation of flow rate measurement liquids (according to patent RU 118681 Е21В 43/14 publ. 07.27.12).

However, using such equipment it is possible to operate only wells with the same pressure. The number of such wells is limited. If the seams have different pressures, then the pressure difference between the seams should be stuck (throttled), turn into heat. Reservoir pressure is not used. When the temperature rises, free gas is released from the reservoir fluid and the probability of salt release increases. Reduced reliability and efficiency of the installation.

Known pump unit for operation of the layers in the well, containing a column of Elevator pipes, cable, shank, packers installed outside the shank between the layers and disconnecting the well into sections, and electric submersible pump for pumping the production of layers, with the input module and the motor and housing. The casing surrounds only the electric motor together with the cable, ends at the input module of the electric submersible pump, on which the sealed cable outlet node is made. The electric submersible pump is designed with a capacity exceeding the total production rate of the formations. The shank is made with several channels, each of which communicates with one of the sections of the well. The installation is equipped with a regulator in the form of a ground control unit, pressure gauges for measuring downhole pressure at the site communicated with the corresponding channel, and solenoid valves in each channel, functionally connected, like pressure gauges, with a control unit that provides the ability to turn on and off the electric submersible pump when bottomhole pressure of a given value in at least one of the sites with simultaneous creation of a message or disconnection of this site or these sites with the housing cavity through the corresponding conductive channel (patent RU 2339795, IPC E 21 B 43/14, publ. 27.11.2008).

Pump installation has a complex structure and insufficient reliability associated with the need to use solenoid valves in each channel. It is impossible to accurately synchronize the opening and closing of different valves. Provided that the two valves are simultaneously open, this will lead to the flow of formation fluid between the layers, which is prohibited by the conditions of operation. If there is a large pressure difference between the layers (which can be more than 70 atmospheres), a high velocity flow will occur with mechanical particles of quartz, this will lead to rapid equipment wear. If two valves are closed at the same time, this will lead to a periodic lack of supply at the pump inlet, pulsations and failure of the installation.

The closest in its technical essence is a pump unit for operating seams in a well, containing a tubing string, cable, shank, a packer installed outside the liner between the layers, and a pump for pumping the formation products, a layer switching device that is hydraulically connected to one layer through a check valve, and with another through a valve with a cutting element in the form of a rod with seals driven by an electric actuator (patent RU No. 2604897).

As well as the technical solutions described above, the installation according to patent RU No. 2604897 is not reliable enough due to the need to maintain the electric actuator of the rod in the on state not only during the movement of the rod to the extreme positions, but also when the rod is fixed in these positions. Time to move the rod takes a fraction of a second, the time to hold the rod is much longer. In this regard, the electric drive is heated, which can lead to its failure in conditions of poor cooling.

The technical problem solved by the proposed utility model is to increase the service life of the pumping unit with the technical result achieved - increasing the reliability of operation.

The proposed pump unit for operation of the layers in the well contains a column of pump-compressor pipes, a packer designed for installation between the layers, a pump for pumping the products of the layers, a unit for switching the flow of the products of the layers, having a housing with a check valve installed in it to provide hydraulic connection with one from layers and a valve with a cutting element in the form of a rod, seals installed in the housing and covering the rod, an electromagnetic actuator, which provides the ability to bring into motion rod, made in the form of a solenoid with a core installed in a cavity filled with oil, which is connected through an elastic diaphragm with the annulus space. New in this installation is the following: the rod is made with a lock of the extreme positions of the rod in the form of a fixed ring with stops fixed to the solenoid case, a movable ring with wedge-shaped hollows having different depths, and a mechanism for rotating the movable ring around the axis and axial movement of this ring along stops, and the movable ring is installed inside the housing coaxially with a fixed ring so that its rotation around the axis is provided after the release from engagement with the stops, the specified rotation mechanism and axial movement of the movable ring is made in the form of two additional rings, one of which is mounted on the core of the solenoid inside the stationary ring with the possibility of axial movement, and the second such ring is fixed inside the movable ring, and the additional rings have axially protruding triangular teeth in the lower position of the rod the tops of the triangular teeth of the additional rings are rotated relative to each other at an angle of 1 to 4 degrees, a bearing is mounted between the movable ring and the rod, on the outer the stem surface is fitted with a spring ensuring the return of the stem in the opposite direction.

In addition, in the particular case of the implementation of the utility model, a centrifugal pump or a sucker rod pump is used.

The essence of the utility model is explained as follows.

When executing the rod (cutting element) with a latch, ensuring the rod is fixed in extreme positions, the latch will increase the reliability and service life of the pump unit, since it eliminates the need to maintain the electric actuator of the rod in the on state not only while the rod moves to the extreme positions, but also during fixation stock in these positions. Time to move the rod takes a fraction of a second, the time to hold the rod is much longer. In this regard, the electric drive is heated, which can lead to its failure in conditions of poor cooling.

If the electromagnetic actuator is made in the form of a solenoid installed in a cavity filled with oil and connected through an elastic diaphragm with the annular space, this will reduce the cost of the actuator and the switching time.

If the stem retainer is made in the form of a fixed ring with stops fixed to the solenoid case, a movable ring with wedge-shaped depressions having different depths, and a mechanism for rotating the movable ring around the axis and axial movement of this ring along the stops, the movable ring is installed inside the housing coaxially with fixed ring so that its rotation around the axis is carried out after disengagement from the stops, the indicated mechanism of rotation and axial movement of the movable ring is made in the form of two rings, one of which is installed on the core of the solenoid inside the stationary ring with the possibility of axial movement, and the second is fixed inside the movable ring, with the additional rings having triangular teeth protruding in the axial direction, the tops of the triangular teeth of the additional rings are rotated relative to each other in the lower position of the rod at an angle of 1 to 4 degrees, a bearing is installed between the movable ring and the rod; a spring is installed on the outer surface of the stem to return the rod to opposite direction, it will clearly fix the position of the rod. The offset of the tops of the teeth at an angle of 1 to 4 degrees allows you to guarantee the rotation in a given direction.

The utility model is illustrated by figures, which depict:

FIG. 1 - pump unit for operation of seams of a well by an electric centrifugal pump;

FIG. 2 - pump unit for operation of seams of a well by a sucker-rod pump;

FIG. 3 - device for switching layers, longitudinal section;

FIG. 4 - isometric fixing element;

FIG. 5 - additional rings of the locking element with protruding in the axial direction of the teeth of a triangular shape; FIG. 6 - rod with seals.

The pumping unit for operation of the well formations (Fig. 1) contains a tubing string 1, a shank 2, a packer 3, an electric submersible pump 4, a submersible electric motor 5, a housing 6, a unit with pressure sensors 7, a flow switching device 8 and a control station 9 The submersible electric motor 5 is connected to the control station 9 by cable 10, and the unit with pressure sensors 7 and the flow switching device 8 are connected by cable 11.

The pumping unit for operation of the seams of the well (Fig. 2) contains a tubing string 1, a shank 2, a packer 3, a sucker rod pump 12, a block with pressure sensors 7, a switch device 8 and a control station 9. A block with pressure sensors 7 and the device switching layers 8 are connected with the control station 9 cable 11.

The switching device layers (Fig. 3) includes a housing in the form of a head 13, the base 14, connected to each other by a pipe 15. In the head is located the inlet channel 16 connected through a check valve 17 to the output of the device switching layers. Inside the housing 15 is a diaphragm 18, the internal cavity of which is filled with oil and connected to the cavity 19, in which the solenoid 20 is located with the rod 21, which separates the channels 22 and 23. Inside the diaphragm 18 is the channel 24.

The rod 21, covered by the seals 25, closes the hydraulic connection with the lower layer due to the shift of the rod 21 upwards by the solenoid 20, the rod returns downwards due to the spring 26 (Fig. 6).

To hold the rod 21 in the upper or lower position, use the latch 27.

The latch 27 of the rod 21 is made in the form of a stationary ring 28 with stops 29, mounted on the core of the solenoid 30, a movable ring 31 with hollows of a triangular shape 32, having different depths installed inside the housing 13, coaxially with the stationary ring 28.

In addition, the retainer includes a mechanism for rotating the movable ring, made in the form of two additional rings 33 and 34, one of which 33 is installed inside the stationary ring 30 with the possibility of axial movement, and the second 34 inside the rolling ring 31, without the possibility of movement.

Moreover, the additional rings 33 and 34 have axially protruding teeth 35 and 36 of a triangular shape, in the lower position of the stem the tops of the triangular teeth of the additional rings are rotated relative to each other by an angle of 1 to 4 degrees. Between the movable ring 31 and the rod 21 is mounted bearing 37.

Pump unit for operation of the layers in the well works as follows.

Installation (Fig. 1, 2) down on the column tubing 1 and fix the packer 3 above the bottom layer of the well. The flow rate of the pump included in the installation is equal to the total flow rate of two layers. The solenoid valve 20 (Fig. 3) closes the reservoir with high pressure (in the layout shown in Fig. 3, this is the lower reservoir).

The pump starts pumping out the formation fluid from one formation (suppose the upper one). The reservoir fluid enters the channel 16, opens the valve 17 and enters the pump inlet. When the pressure of the upper layer, measured by a unit with pressure sensors 7 (Fig. 1, 2), decreases by a predetermined value, control station 9 sends an electrical signal to the solenoid 20 (Fig. 3). The rod 21 moves upwards, the teeth 36 rotate relative to the teeth 25 by an angle equal to 360/2 * k, where k is the number of teeth. At the same time, the ring 31 rises, the protrusions 29 are released from the engagement with the depressions 32. The movable wheel 31 fastened with the ring 34 leaves the engagement with the ring 28, is turned in the bearing 37 at the same angle. Further, the protrusions 29 are included in the following in the course of rotation of the shallower depressions 32 on the ring 31, while this occurs before the door at an angle of 360/2 * k. In total for one solenoid switch-on, a rotation through 360 / k occurs. The downward movement of the rod 21 occurs due to the action of the spring 26, while the channels 22 and 23 are connected. The formation fluid from the lower layer through the shank 2 (Fig. 1, 2), channel 24 (Fig. 3), the internal cavity of the housing 15, channels 22 and 23 enters the pump inlet.

The valve 17 is closed due to the pressure difference between the layers. There is a pumping of formation fluid from the lower layer. When the pressure of the lower reservoir decreases by a predetermined amount, the control station 9 (Fig. 1, 2) delivers an electrical signal to the solenoid 20 (Fig. 3). The rod 21 moves and separates the channels 22 and 23. Pumping from the upper layer begins, the cycle repeats.

The installation can also work for the operation of two layers in one well, provided that the pressures in the layers are the same. In this case, the solenoid 20 will always be open. The entrance to the pump will be hydraulically connected simultaneously with two layers, since the check valve 17 practically does not require a pressure drop to open. The solenoid valve 20 will be used only for periodic shutdown of one of the layers in accordance with the channel in which it is installed. This is necessary for hydrodynamic studies and studies of the composition of the reservoir fluid, the water content in each reservoir.

The proposed utility model will improve the reliability of the equipment.

Thus, the solutions used in the utility model, increase the service life of the pumping unit.

Claims (3)

1. A pump unit for operation of formations in a well, containing a tubing string, a packer for installation between layers, a pump for pumping production of formations, a unit for switching the flow of production of formations, having a housing with a check valve installed in it to provide hydraulic communication with one of the layers and a valve with a cutting element in the form of a rod, seals installed in the housing and covering the rod, an electromagnetic actuator that provides the ability to actuate the rod, made in the form of a solenoid with a core installed in a cavity filled with oil, which is connected through an elastic diaphragm with annular space, characterized in that the rod is made with a lock of the extreme positions of the rod in the form of a fixed ring with stops attached to the solenoid case, a movable ring with depressions wedge-shaped, having different depths, and a mechanism for rotating the movable ring around the axis and the axial movement of this ring along the stops, with the movable ring mounted inside the housing coaxially with the with a fixed ring so that its rotation around the axis is provided after it leaves the engagement with the stops, the said mechanism of rotation and axial movement of the movable ring is made in the form of two additional rings, one of which is mounted on the solenoid core inside the fixed ring with the possibility of axial movement, and the second is the ring is fixed inside the rolling ring, and the additional rings have axially protruding teeth of a triangular shape; in the lower position of the stem, the tops of the triangular teeth will complement lnyh rings are rotated relative to each other at an angle of from 1 to 4 degrees, between the movable ring and the bearing rod mounted on the outer surface of the rod a spring providing a return rod in the opposite direction. 2. Installation under item 1, 2, characterized in that used centrifugal pump type. 3. Installation under item 1, 2, characterized in that the sucker rod pump is used.

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