RU67657U1 - DRIVE OF A CHAIN Borehole Rod Pump PTS 80-6-1 / 4 BMZ - Google Patents

Abstract

The proposal relates to the field of the oil industry, namely to oil production by a mechanized method, in particular to chain drives for a borehole sucker rod pump, mainly 6 meters high.

The drive comprises a housing, an engine, a gearbox mounted on a base on a single frame, a mechanism placed in the housing that converts rotational motion into reciprocating motion and includes drive and driven sprockets, enclosed by a closed traction chain connected to a carriage connected to a U-shaped counterweight the cross-sectional shape and installed in the guides of the housing with the chain in its open cavity, connected through a connecting element to the rod suspension unit, the vertical axis of symmetry transform the connecting mechanism, the counterweight and the connecting element are located in close proximity to one vertical plane, the mechanism for the drive to roll back from the wellhead, the driven sprocket is installed in the housing with the possibility of limited movement along the axis of the converting mechanism to control the chain tension, and the lower part of the housing is equipped with a lubrication device the traction chain, while the linking element of the counterweight with the node suspension rods is made in the form of a tape of flexible non-metallic elastic material, and the counterweight with the suspension unit of the tape is made using a drum mounted to rotate around a horizontal axis, and the guide rollers of the counterweight rollers are made of non-metallic material, the casings of which are equipped with bolts for adjusting the position of the counterweight relative to the guides of the drive housing, moving it forward or backward, to the left or to the right, to ensure the operation of the traction chain in optimal conditions

loading, while the drive frame is mounted on a foundation plate equipped with squeezing devices for moving the drive in a horizontal plane and along the axis perpendicular to the axis of movement of the drive from the wellhead, the drive gearbox is equipped with an electromechanical braking system fixed to its body in case of emergency, while the plate is under gear and the plate under the support of the drive sprocket is equipped with bolts for adjusting their position along two mutually perpendicular axes, as a non-metallic material for For the manufacture of guide rollers of the counterweight rollers, polyamide was selected, the set of counterweight weights was molded, and the counterweight weights relative to its axis of symmetry were asymmetric, and a rubber-fabric conveyor belt with synthetic cord was selected as a non-metallic elastic material for the manufacture of the belt, and the drive rollback mechanism from the wellhead was made in the form of a winch and mounted on the base in the form of a foundation plate. 6 pf, 10 ill.

Description

The proposal relates to the field of the oil industry, namely to oil production by a mechanized method, in particular to chain drives for a downhole sucker rod pump, mainly a stroke length of 6 meters.

The well-known "Drive sucker rod pump" (see US Patent No. 4916959, int. C1. 4 B66B 5/26), containing installed on the basis of a single frame with the body of the engine, gearbox, a mechanism placed in the body, which converts rotational motion into reciprocating translational, including the leading and driven sprockets, covered by a closed chain connected with a carriage connected to a counterweight made in a U-shape in cross section and installed in the guides of the housing with the chain in its open cavity and connected through a flexible link with a rod suspension unit, and the axes of the converting mechanism, counterweight and flexible link are close to the same vertical plane, the upper sprocket is mounted in the housing with the possibility of rotation and limited movement along the axis of the converting mechanism to regulate the chain tension, and a lubricating oil tank is made in the lower part of the housing . In this drive, the oil level in the bath must reach the lower sprocket to ensure chain lubrication. The disadvantage of the closest analogue is the large required volume of the bath and lubricating oil, since in the lower position of the counterweight the carriage is immersed in the oil bath at least half the height. Under certain operating conditions of the drive, characterized by a large load on the circuit at a low speed and a long stroke, lubricate the circuit by dipping in

the oil bath in a small section of the chain may not be enough, which reduces the durability of the drive.

The disadvantages of the known drive are:

- low reliability and durability due to the lack of a closed-circuit lubrication system;

- the inability to adjust the position of the driven sprocket in relation to the leading makes it difficult to install them in one plane, which also reduces the durability of the transforming drive mechanism;

- the complexity and complexity of the connection (and disconnection) of the suspension unit of the actuator rods with the wellhead rod transmitting movement from the actuator to the rod string, since after the descent of the sucker rod pump into the well, the wellhead rod is in the lower position and it is also necessary to lower the suspension unit to connect it , for which it is necessary to raise the counterweight to the upper position, which is not possible using your own drive motor (the weight of the counterweight is chosen equal to the weight of the rod string plus half the weight of the raised column liquid, and the power of the drive engine - based on the lifting of half the weight of the liquid column, because during operation of the drive, when the counterweight and the rod string are connected by a flexible link, only this part of the load remains unbalanced);

- low maintainability due to the lack of the possibility of fixing the counterweight in the case, if necessary, temporarily disconnecting the chain, the flexible link, the carriage parts and other nodes for their revision and replacement. The installation of the drive sprocket in the known drive directly on the output shaft of the gearbox also reduces the maintainability of the drive, since it is impossible to dismantle the gearbox without disconnecting the drive sprocket from the closed circuit of the conversion mechanism. In addition, this design requires the use of a special gearbox with an increased output shaft length, designed for increased

load, because in addition to the torque, it has a cantilever load equal to the traction of a closed circuit.

Also known is the drive of a borehole sucker-rod pump (see Patent RU No. 2283969, IPC 7 F04B 47/02, Publ. In B.I. No. 26 of 09/20/2006), containing an engine, gearbox mounted on a single frame with a housing in the case, a mechanism that converts rotational motion into reciprocating and includes driving and driven sprockets covered by a closed traction chain connected to a carriage connected to a counterweight made in a U-shape in cross section and installed in the guides of the body with the chain in its open position cavity with dyna through a connecting element with a rod suspension unit, the vertical axis of symmetry of the conversion mechanism, the counterweight and the connecting element are located in the immediate vicinity of one vertical plane, the driven sprocket is installed in the housing with limited movement along the axis of the converting mechanism to regulate the chain tension, and the lower part of the housing equipped with a device for lubricating the traction chain.

This drive is in technical essence closer to the proposed one and can be adopted as a prototype. However, he is not without flaws.

The main disadvantages of the prototype are:

- the lack of regulation of the position of the counterweight relative to the guides of the drive housing, which for this reason does not ensure the operation of the traction chain under optimal loading conditions, which negatively affects the reliability and durability of the drive;

- large metal consumption, and its manufacture is fraught with technological difficulties;

- lack of braking system in emergency situations;

- the complexity of the design of the node of the connecting element of the counterweight with the node of the suspension of the rods, requiring great precision regulation of the flexible link;

- the lack of devices for moving the drive in the horizontal plane and along the axis perpendicular to the axis of movement from the wellhead, as well as the inability to regulate the gearbox and the drive sprocket along two perpendicular axes, which causes certain difficulties in setting up the drive associated with the time spent;

The objective of the claimed utility model is to eliminate the above disadvantages.

The problem is solved by the described drive containing a housing mounted on the base on a single frame, an engine, a gearbox, a mechanism placed in the housing that converts rotational motion into reciprocating and includes drive and driven sprockets covered by a closed traction chain connected to a carriage connected to a counterweight, made U-shaped in cross section and installed in the guides of the housing with the placement of the chain in its open cavity, connected through a connecting element to the suspension unit ki rods, vertical axis of symmetry of the conversion mechanism, the counterweight and the connecting element are located in close proximity to one vertical plane, the mechanism for the drive to roll back from the wellhead, the driven sprocket is installed in the housing with the possibility of limited movement along the axis of the conversion mechanism to regulate the chain tension, and the lower part of the housing is equipped with a device for lubrication of the traction chain.

New is the fact that the connecting element of the counterweight with the node suspension rods is made in the form of a tape of flexible non-metallic

elastic material, and the counterweight is connected to the suspension unit using a drum mounted to rotate around a horizontal axis, and the guide rollers of the counterweight rollers are made of non-metallic material, the casings of which are equipped with bolts for adjusting the position of the counterweight relative to the guides of the drive housing, moving it forward or back, left or right, to ensure the operation of the traction chain under optimal loading conditions, while the drive frame is mounted on a foundation plate equipped with squeezing devices for moving the drive in a horizontal plane and along the axis perpendicular to the axis of movement of the drive from the wellhead, the drive gearbox is equipped with an electromechanical braking system fixed to its body in case of emergency, while the plate under gear and the plate under the support of the drive sprocket are equipped with bolts to regulate their position along two mutually perpendicular axes.

New is also the fact that polyamide is selected as a non-metallic material for the manufacture of guide rollers of the counterweight rollers, the set of counterweight weights is molded, the counterweight weights are asymmetrically relative to its axis of symmetry, and a rubber-fabric conveyor belt with synthetic material is chosen as a non-metallic elastic material for the manufacture of the belt cord, while the drive rollback mechanism from the wellhead is made in the form of a winch and mounted on the base in the form of a foundation plate.

The presented drawings explain the essence of the proposal, where Fig. 1 shows a general view of the claimed utility model, side view.

Figure 2 is a counterweight with rollers, where the housing and guide rollers with adjusting bolts are visible.

In Fig.3 - a connecting element made in the form of a non-metallic elastic flexible tape, a counterweight with a suspension unit.

Figure 4 - frame on wheels on the eccentric axes.

In Fig.5 - the base with a built-in winch.

6 is a front view of the drive.

7 is a General view of the electromechanical emergency system

braking, in partial section, front view.

In Fig.8 is a section along aa in Fig.7.

In Fig.9 - the same as in Fig.7. emergency braking system, side view, in partial section.

Figure 10 is a section along BB in figure 9.

The downhole sucker-rod pump drive (see FIG. 1) contains a base 1 in the form of a foundation plate with fasteners for the frame 2, on which the housing 3, the motor 4, and the gearbox 5 are mounted. In the housing 3 there is a mechanism that converts rotational motion into reciprocating including the leading and driven sprockets 6 and 7, respectively, covered by a closed traction chain 8, connected to the carriage 9, connected by a U-shaped counterweight 10 in cross section (see figure 2) with a set of weights 11. The latter are cast, and are locatedasymmetrically relative to the axis of the counterweight provided with rollers made in the form of guide rollers 12 installed in the guides of the housing 3. The guide rollers 12 of the counterweight rollers (see figure 2) are made of non-metallic material, for example, polyamide or a material similar in technical characteristics, which reduces friction, metal consumption, and ensures silent operation of the drive. The traction chain 8 is placed in the open cavity of the counterweight. And the implementation of a set of cast cargoes makes it possible to simplify the technology of their manufacture and leads to a decrease in the metal consumption of the drive.

The counterweight 10 through a connecting element made in the form of a flexible flexible non-metallic tape 13 (see figure 3), is connected to the node

pendants 14 of rods 15 using a drum 16 mounted for rotation around its horizontal axis 17. At the same time, a rubber-fabric conveyor belt with synthetic cord was selected as a flexible non-metallic material for the manufacture of the belt.

The casings of the guide rollers 12 are provided with bolts 18 (see FIG. 2) for adjusting the position of the counterweight relative to the guides of the drive housing 3, moving it forward or backward, left or right, to ensure the operation of the traction chain under optimal loading conditions (see FIG. 2) .

The frame 2 is equipped with metal wheels 19 mounted on individual eccentrically made axles 20 (see figure 4) with the possibility of limited rotation. To roll back the drive from the wellhead 21, a winch 22 is mounted on the base 1 (see Fig. 5). The base 1 is also equipped with squeezing devices made in the form of bolts 23 for moving the drive in a horizontal plane and along the axis perpendicular to the axis of movement of the drive from the wellhead. In this case, the frame 2 itself is made with the possibility of fixing relative to the base 1 in any positions. The driven sprocket 7 (see Fig. 6) is installed with the possibility of limited movement along the axis 24 of the converting mechanism for adjusting the tension of the traction chain 8, as well as limited movement along its axis and fixing. For automatic emergency braking of the drive, in case of breakdown of the pump rods, in which the load of the counterweight 10 may drop, or during emergency current surges in the circuit of the electric motor 4, as well as for braking when it is turned off for maintenance, the gearbox 5 is equipped with an electromechanical emergency braking system 25 (see Fig.7). Lubrication of the traction chain is provided by lubricating oil coming from the holes of the buckets 26 (see Fig. 6) installed on both sides of the counterweight 10, and scooping up the lubricating oil during operation of the drive

from a container 27 fixed to the lower part of the housing 3. A removable manual drive 28 is installed on the frame 2 (see Fig. 8) with a retractable support 29 made in the form of a self-braking worm pair, the worm wheel 30 of which is mounted on the high-speed shaft 31 of the gearbox 5, and the worm 32 is installed in the bearings 33 of rotation of the retractable bearings 29 and is connected with the drive handle 34 for rotation. The sub gear plate 35 and the plate 36 (see FIG. 1) under the support of the drive sprocket are provided with bolts 37 and 38, respectively, for adjusting their position along two mutually perpendicular axes.

The chain drive operates as follows.

It is delivered to the wellhead and installed on the base 1 so that the axis of the frame 2 is aligned with the axis of the well 21. At the same time, the bolts 23 of the squeezing device are precisely adjusted (see FIG. 1). Next, adjust the position of the gearbox 5 and the drive sprocket 6 with bolts 37 and 38 of the sub-gear plate 35 and the plate 36 under the support of the drive sprocket relative to the engine 4. Then, the suspension unit 14 of the rods are aligned with the axis of the wellhead shaft 21 by moving the entire drive structure forward or backward after preliminary lifting above the base 1 by turning the eccentric axes 20 of the wheels 19 (see FIG. 4) by the amount of their eccentricity, at which the wheels of the frame 19 rest on the base 1. After adjustment is completed by turning the eccentric axes 20 ama again put on the ground. Also, the driven sprocket 7 is adjusted (see FIG. 6) by shifting its axis up or down along the axis 24 of the converting mechanism, having previously loosened the fixing bolts 39, thereby ensuring optimal tension of the traction chain. By moving the driven sprocket left or right relative to its axis, a minimum deviation of the plane of the traction chain 8 from the plane of rotation of the driven and driving sprockets 7 and 6, respectively, is achieved. At the end of the adjustment operation, the fixing bolts 39 are tightened. On the frame also mounted

and a disconnectable manual drive 28 (see Fig. 8) with a retractable support 29, with which, rotating the drive handle 34, lower the suspension assembly 14 to the lower position and connect it to the wellhead, after which the disconnected manual drive is removed. An electromechanical emergency braking system 25 is fixed to the gear housing 5. By means of bolts 18 of the housing of the guide rollers 12 (see FIG. 2), the position of the counterweight with the set of weights relative to the guides of the drive housing 3 is adjusted by moving forward or backward, left or right to ensure the operation of the traction chain 8 under optimal loading conditions. A winch 22 is mounted on the foundation plate, a lubricating oil of the required volume is poured into the container 27, after which the drive motor 4 is launched into operation, which transmits the rotational movement to the drive sprocket 6 through the gearbox and then the mechanism that converts the rotational motion into reciprocating is set in motion. In this case, the carriage 9 connected to the traction chain 8 transmits its reciprocating motion to the counterweight 10, which in turn transmits the reciprocating motion through a flexible non-metallic tape 13 and the rod suspension unit 14 to the rod string 15.

If it is necessary to carry out various repair and restoration works or underground repair of wells by turning the eccentric axes 20 (see Figs. 5 and 6), the wheels of the frame 2 are moved to the lower position until they come in contact with the base, at which the frame rises by the eccentricity of the axes 20 (see 4) above the base and with the help of a winch 22 (see FIG. 5) or a mechanical drive, the frame on wheels together with the drive is rolled back from the wellhead to the required distance. After completion of work in the well, the drive is installed in the working position in the reverse order.

In the process of operation of the drive, when the counterweight 10 is in its lowest position, the buckets 26 (see Fig. 6) are each time immersed in

capacity 27 and are filled with lubricating oil. During the upward stroke, oil flows out through the holes of the side wall of the buckets symmetrically installed on both sides of the traction chain 8 and lubricates the traction chain with a continuous stream. Excess oil drains from the chain back to the tank. During the operation of the well, emergency situations may occur due to the breakage of the rods, short circuit, phase failure, which creates the danger of the counterweight 10 falling with a set of loads, which can cause destructive actions and life threatening to the operator. In the event of an emergency, the counterweight begins to accelerate the movement of the drive, in which the sensor 40 of the emergency brake 25 detects the deviation of the rotational speed of the gearbox shaft 5 and the control unit automatically turns on the electromagnet 41 (the control unit is not shown in Fig.). The latter rotates the trigger 42 and releases the lever 43, which, under the action of the rod 44, rotates on the threaded axis 45 and presses the button 46 of the brake 47, as a result, the pads 48 are pressed against the rotating drum 49 and brake the input shaft of the gearbox, thereby preventing danger.

When carrying out repair work or technical inspection of the state of the main components and parts of the drive, it becomes necessary to move the working bodies of the drive to the desired position. For this case, a manual drive is provided in the electromechanical braking system. To use it, the stopper 50 of the worm 51 is removed, the worm is tilted by the handle E ^ .. Next, by rotating the handle, find the position in which the worm pair is engaged, after which the stopper 50 is inserted back. Then release the shaft lock 52 and the brake 47.

Feasibility proposals are as follows. The drive chain of the proposed design in comparison with the known, has increased reliability and durability and manufacturability. Thus, the manufacture of guide rollers of the counterweight rollers from non-metallic material significantly reduces their strength

friction, leads to a smooth and silent operation of the drive, as well as to reduce metal consumption. An individual performance of the axles of the wheels of the frame also leads to a decrease in metal consumption. The manufacture of the counterweight connecting element with the suspension unit in the form of a flexible flexible non-metallic tape allows to increase the overhaul period of the drive, simplifies the design, and also reduces metal consumption. The ability to control the position of the counterweight relative to the drive housing ensures the operation of the traction chain under optimal loading conditions, which helps to increase the reliability and durability of the drive. In addition, the inventive drive has enhanced technical safety due to the presence of an electromechanical emergency braking system in it, which provides maintenance personnel with safe operation and operation of the drive as a whole.

Claims (6)

1. Chain drive, comprising a housing, an engine, a gearbox mounted on a base on a single frame; a mechanism placed in the housing that converts rotational motion into reciprocating and includes drive and driven sprockets covered by a closed traction chain connected to the carriage connected to the counterweight, made in a U-shape in cross section and installed in the guides of the housing with the chain in its open cavity, connected through a connecting element to the rod suspension unit, the vertical axis are symmetrical and the conversion mechanism, the counterweight and the connecting element are located in close proximity to one vertical plane, the mechanism for the drive to roll back from the wellhead, the driven sprocket is installed in the housing with limited movement along the axis of the conversion mechanism to control the chain tension, and the lower part of the housing is equipped with a device for lubrication of the traction chain, characterized in that the connecting element of the counterweight with the node of the suspension rods is made in the form of a tape of flexible non-metallic e material, and the counterweight is connected to the suspension unit using a drum mounted to rotate around the horizontal axis, and the guide rollers of the counterweight rollers are made of non-metallic material, the casings of which are equipped with bolts for adjusting the position of the counterweight relative to the guides of the drive housing, moving it forward or back, left or right, to ensure the operation of the traction chain under optimal loading conditions, while the drive frame is mounted on the foundation a plate equipped with squeezing devices for moving the drive in a horizontal plane and along an axis perpendicular to the axis of movement of the drive from the wellhead, the drive gearbox is equipped with an electromechanical braking system fixed to its body in case of emergency, while the sub-gear plate and the plate under the drive sprocket support are equipped with bolts to regulate their position along two mutually perpendicular axes. 2. The drive according to claim 1, characterized in that polyamide is selected as the non-metallic material for the manufacture of guide rollers of the counterweight rollers. 3. The drive according to claim 1, characterized in that the set of counterweights is cast. 4. The drive according to claim 1, characterized in that the loads of the counterweight relative to its axis of symmetry are located asymmetrically. 5. The drive according to claim 1, characterized in that a rubber-fabric conveyor belt with synthetic cord is selected as a non-metallic elastic material for the manufacture of the belt. 6. The drive according to claim 1, characterized in that the drive rollback mechanism from the wellhead is designed as a winch and mounted on the base in the form of a foundation plate.