Differentially balanced pumping unit

FIELD: mechanics, oil and gas industry.

SUBSTANCE: unit is intended for using as deep well pump for oil production from oil wells. The unit consists of a platform, pedestal with gearbox and rack being installed on it, electric motor coupled with gearbox through multiple V-belt drive. Differential crank converting mechanism is installed on the gearbox output shaft. The above mentioned converting mechanism contains two cranks interrelated through planetary gear. The central crank is rigidly installed on the gearbox output shaft. Driving crank with tension pulley is mounted on the central crank output shaft. Polished rod carrier bar is installed at the other side of gear box. The rack is installed on pedestal between polished rod carrier bar and tension pulley of driving crank. The oscillating equal-arm rocker is movably mounted on the rack and immovable heads are rigidly fixed to the rocker ends. From the side of converting mechanism cranks, the rocker head is connected with tension pulley of driving crank, while the other rocker head is coupled with polished rod carrier bar from the side of the above bar. The rack and rocker are implemented so that the rocker can rotate around its axis. The rocker head edges are in vertical plane, which is at some distance away from the wellhead. It is provided by the invention that balanced pumping unit design is implemented so as rack with rocker and converting crank mechanism being placed at one side of gearbox. Comfortable conditions for drive repair operations.

EFFECT: linear reciprocal motion of tension pulley is ensured on driving crank.

3 dwg, 4 cl

 

The invention relates to techniques for extracting oil from wells and can be used to drive a sucker rod pumps.

Known machine-rocking with Centerpoint Preobrazhensk mechanism. It contains a frame, a rack associated belt-driven motor and gear, balancer mechanism for converting rotational motion of the output shaft of the gearbox in the reciprocating movement of the suspension wellhead rod. This mechanism consists of a crank placed on the output shaft on both sides, pivotally connected with the cranks rods which traverse through associated with movably mounted on the rack two shoulders oscillating balance wheel with a head on which is fixed a flexible element with suspension wellhead rod (GOST 51763-2001, Drives a sucker rod pumps, Gosstandart of RUSSIA, Moscow, p.3 1).

The disadvantage of this pumping unit is that converting mechanism includes a swinging rods and traverse that leads to alternating horizontally efforts, acting on the rack and sway steel, and in case of breakdown of one of the rods to damage the metal.

Also known machine-rocking with the differential crank transforming mechanism containing a base, a pedestal installed re what Octomom and stand with crossbar and the guide pulleys, the drive motor, V-belt transmission. Such a pumping unit on the output shaft of the gearbox, on the one hand, has a differential crank transforming mechanism leading to the crank which is connected through a flexible element through the guide pulleys of the crossbar, with suspension wellhead rod, which is located on the other side of the gearbox than Krivoshey mechanism (EN 2270367 C2, 20.02.2006).

The disadvantage of this pumping unit is that the guide pulleys have relatively small diameters, which reduces the service life of the flexible element, and that the design of the crossbar is complicated due to the necessity of using a special mechanism for rotating and fixing the position of the crossbar when executed on the well repair work.

The purpose of this invention is to provide a pumping unit conversion mechanism which eliminated the disadvantages of the machines-rocking with Centerpoint and differential transforming mechanisms.

This task is achieved by the fact that the rack movably mounted rocker with two fixed heads at its ends, and the head of the balancer-side differential crank-changing mechanism by means of a flexible element connected with the tensioning pulley of a driving crank this mechanism is ZMA, and the other head from the suspension wellhead rod, by means of another flexible element connected with the suspension wellhead rod, at this hour, and the balancer is made with the possibility of rotation of the balance wheel around its axis, while turning towards cranks up its vertical position.

The shoulders of the balancer can be equal to and not equal to each other. Then at constant radii of cranks, if the length of the shoulder of the balance weight from the suspension wellhead rod is greater than the length of the shoulder of the balancer from the cranks, then increasing the length of the stroke, and Vice versa, if the length of the shoulder of the balance weight from the suspension wellhead rod is smaller than that of the crank, it increases traction.

Such design of the pumping unit is simple and reliable. Compared with the known machine-rocking with differential converting mechanism with the crossbar and the guide pulleys increases the bending radius of the flexible element, which increases its durability. Eliminates the mechanism for rotating and fixing the crossbar, which simplifies the design of the pumping unit. Compared with the known machine-rocking with Centerpoint transformative mechanism simplifies the design and improves reliability because there is no swinging rods, traverse and tilt head balancer, front-loaded vertical only what silemi.

The described machine-rocking chair can also be carried out according to the scheme, when the hour and a differential crank transforming mechanism located on one side of the gear and the axis of the rack and the longitudinal axis of the balancer are in a vertical plane passing through the axis of the output shaft of the gearbox.

Figure 1 is a schematic representation of the proposed differential-balancer machine-rocking; figure 2 schematically presents a side view; figure 3 presents a variant of the pumping unit when the hour and converts differential mechanism located on one side of the gear and the axis of the rack and the longitudinal axis of the balancer are in a vertical plane passing through the axis of the output shaft of the gearbox.

A conventional pumping unit comprises a base 1, a stand 2, a motor 3, which is connected through V-belt transmission 4 gear 5, which converts the differential crank mechanism, which is mounted on the output shaft with one hand and contains two interconnected through a planetary gear of the crank - Central 6, rigidly mounted on the output shaft 5, and the leading crank 7, mounted on the output shaft of the Central crank 6. Suspension wellhead rod 8 is located on the other side of the gearbox. Hour 9 is located directly on the Cabinet above the gearbox, and podi is installed but oscillating weight 10 with two rigidly mounted at its ends by heads 11 and 12. The tension pulley 13 mounted on the master crank, connected with the first cylinder 11 of the rocker by means of the flexible element 14, and the suspension wellhead rod 8 through a flexible element 15, is associated with another cylinder 12 of the balancer. During this 9 hour set so that its axis, the longitudinal axis of the balancer 10, axle suspension wellhead rod 8 and the mounting point of the tension pulley 13 on the master crank 7 is located in the same vertical plane passing through the axis of the output shaft of the gearbox 5. To balance pumping unit on the master crank installed cargo 16. On the input shaft of the gearbox is also a brake device 17. Fencing and grounds for maintenance of the pumping unit conventionally not shown.

A conventional pumping unit operates as follows.

The rotation from the electric motor 3 through V-belt transmission 4 and the gear 5 is transmitted to the Central crank 6 and through the gears leading to the crank 7 with the tension pulley 13 differential crank transformative mechanism. While the tension pulley on the master crank gets the vertical rectilinear reciprocating motion and through the flexible element 14 and the cylinder walking beam 11 rotates the body of the balancer 10, and through the head 12 of the balancer and the flexible element 15 passes the vertical movement of the suspension wellhead rod 8. While traction is when lifting the suspension wellhead rod 8 is composed of forces from gravity loads, crank and torque transmitted by the gearbox, and when lowering the pulling force from the suspension wellhead rod is passed through the equalizer and flexible elements on the tension pulley of a driving crank and, together with the force from the torque transmitted by the gearbox, provides lifting cranks.

Advantages of pumping units are extremely compact and robust design. There are no weak links as rods, yoke, swivel head, inherent in the known balancing machines, front-loaded only vertical efforts, and therefore no forces sway design. The cranks rotate counter, and therefore the dynamic pressure is minimized. Head balancer rigidly connected with the body of the balancer and have large radii, which is favourable for increasing the service life of the flexible element. Provides ease of maintenance for repair works through simple rotation of the balancer with his head in the direction of the cranks to its vertical position. When this position of the rocker edges of the heads of the balancer from the side of the wells are located in a vertical plane, spaced from the wellhead at a distance, and forms a space for holding the well repairs. It does not require fixation ve the vertical position of the balancer, as it will be held in this position due to unbalanced relative to the vertical axis of the rack mass.

Is of practical interest is also a variant of the pumping unit when the hour with a balance wheel with hand crank and the axis of the rack and the longitudinal axis of the balancer are located in a vertical plane passing through the axis of the output shaft of the gearbox. In this case, the strut with a stabilizer, in fact, installed on the well fixed and connected with the drive only flexible element. Therefore, it is convenient for maintenance and repairs of the drive pumping unit, and if necessary, replace gearbox repair, or installation of gears with different gear ratio, if necessary, a dramatic change in the frequency of oscillations of the pumping unit.

1. Differential-balancer machine-rocking containing the base Cabinet with the attached gear and rack drive motor, V-belt, reducer, the output shaft of which one side has a differential crank transforming mechanism, suspension wellhead rod, which is located on the other side of the gearbox than a crank mechanism and a flexible element, characterized in that the rack movably mounted rocker with two fixed heads at its ends, when the eat the head of the balancer-side differential crank-changing mechanism by means of a flexible element connected with the tensioning pulley of a driving crank of the mechanism, and the other head from the suspension wellhead rod, by means of another flexible element connected with the suspension wellhead rod, at this hour, and the balancer is made with the possibility of rotation of the balance wheel around its axis, while turning in the direction of the cranks to its vertical position.

2. A conventional pumping unit according to claim 1, wherein the balancer is made with the dimensions of the shoulders, are equal to each other.

3. A conventional pumping unit according to claim 1, wherein the balancer is made with the dimensions of the shoulders, not equal to each other.

4. A conventional pumping unit according to claim 1, characterized in that the hour with the balancer and differential crank transforming mechanism located on one side of the gear and the axis of the rack and the longitudinal axis of the balancer are in a vertical plane passing through the axis of the output shaft of the gearbox.



 

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