RU2783050C1 - Stand of the chain drive of a downhole rod pump - Google Patents

Abstract

FIELD: measuring equipment.

SUBSTANCE: invention relates to research in the field of petroleum production; in particular, to laboratory measuring equipment for modelling the processes of operation of downhole rod pump units. Stand of the chain drive of a downhole rod pump comprises a frame; an electric engine 2 with a reducer gearbox 3, installed on the frame 1; and a mechanism for converting the rotational motion into reciprocating motion. Said mechanism consists of a driving and a driven sprockets enclosed in a pull chain with a tensioning apparatus 9, linked with a carriage, connected with the counterweight 11 configured to move along the guides 12, and transmitting further movement using a flexible link 13 through the pulleys onto the load. The load simulates a rod string with an additional counterweight 16 in the fastening assembly of the flexible link between the pulleys in order to ensure constant friction during the operation of the stand.

EFFECT: possibility of researching the operation of the chain drive of a downhole rod pump in a laboratory setting.

2 cl, 2 dwg

Description

The invention relates to research in the field of oil production, in particular to laboratory and measuring equipment for modeling the processes of operation of installations of borehole rod pumps in laboratory conditions.

A known stand for testing drives of downhole rod pumping units (SU 1255749 A1, class F04B 51/00, 1986), containing a load device in the form of a variable weight load associated with a suspension and a flexible link of the drive and simulating the weight of the pump rod string, and as well as an additional load device that simulates the weight of the well fluid column in the tubing string by means of the backwater pressure.

The disadvantage of this device is that the stand is not adapted to various experimental studies of the traction chain of the chain drive of the downhole rod pump.

The prototype was taken as a stand for testing drives of downhole sucker-rod pumping units (RU 111209 U1, class F04B 51/00, 12/10/2021), containing a drive, a suspension, a flexible link, a hydraulic system, a hydraulic cylinder with a piston and a rod placed in the housing. The cavity of the body of the hydraulic cylinder and the capacity of the working fluid are communicated through an adjusting device in the form of a check valve and a throttle. The rod of the hydraulic cylinder is connected with the suspension and the flexible link of the drive by means of a rope through the crown block, the guide roller and the dynamograph, and the reservoir of the working fluid is installed at the pumping station.

The stand allows you to record the measured parameters on a computer and, with the help of subsequent processing, evaluate the work of the test.

This installation is designed to study the operation of drives of downhole sucker-rod pumping units without the use of control weights and a lifting mechanism in real conditions.

The disadvantage of the known stand for testing drives of downhole sucker-rod pumping units is a complex design, large dimensions and the inability to conduct experimental studies using a toothed chain.

The technical problem that is solved in the implementation of the invention is the creation of a stand for a chain drive of a borehole rod pump and the study of its operation.

EFFECT: technical result - will allow using the stand in laboratory conditions and increase the range of studies, the ability to conduct experimental studies using a toothed chain.

The technical result is achieved by the fact that the stand for the chain drive of the downhole rod pump contains the main frame with an electric motor installed on it, a flexible link and a pulley. According to the invention, the bench includes a gearbox connected to an electric motor and a mechanism that converts rotational motion into reciprocating motion, consisting of a driving and driven sprockets covered by a traction chain, having a tensioner and connected to a carriage connected to a counterweight installed with the possibility of movement along the guides, and transmitting further movement with the help of a flexible link through the pulleys to a load that simulates a column of rods with an additional counterweight in the flexible link fixation unit between the pulleys, which ensures constant friction during the stand operation. The stand for the chain drive of the downhole rod pump has the ability to use roller and toothed chains in operation.

In FIG. 1 shows a diagram of a stand for a chain drive of a borehole rod pump,

in fig. 2 - view A.

1 - frame with the possibility of adjustment;

2 - electric motor;

3 - reducer;

4 - roller chain;

5 - cassette of stars;

6 - leading sprocket;

7 - closed flexible link (traction chain);

8 - driven sprocket;

9 - chain tensioner;

10 - carriage rolling pin;

11 - counterweight;

12 - counterweight guides;

13 - flexible link (connecting the counterweight to the wellhead hanger);

14 - guide pulley;

15 - cargo;

16 - additional counterweight.

The stand for the chain drive of the downhole rod pump (Fig. 1) includes a frame 1, an electric motor 2 installed on it, which is connected to the gearbox 3 by a V-belt transmission, the subsequent transmission occurs due to a small chain 4 to the sprocket cassette 5 connected to the drive sprocket 6, which through the traction chain 7 is connected to the driven sprocket 8, which has a tensioner 9 and a rigid connection with the rolling pin of the carriage 10 and the counterweight 11, the movement of the carriage with the counterweight occurs along the guides 12, transmitting further movement with the help of a flexible link 13 through the pulleys 14 to the load 15, simulating the column rods, an additional counterweight 16 is also installed in the flexible link fixation unit between the pulleys to ensure constant friction during the operation of the stand.

The experimental stand works as follows.

When connected to the mains and the power button is turned on, the electric motor 2 is activated and, through a pulley with a V-belt transmission, transmits rotation to the input shaft of the gearbox 3. The output shaft of the gearbox 3 through the sprocket and chain drive 4 rotates the sprocket cassette 5 mounted on the shaft of the drive sprocket 6. the sprocket 6 actuates the traction chain 7 with the driven sprocket 8. The traction chain 7 has a tensioner 9 and is connected to the rolling pin 10 of the counterweight carriage 11, due to the rolling pin 10 repeating the trajectory of the traction chain 7, as a result of which the rotational movement is converted into reciprocating , which is transferred from the counterweight 11 with the help of a flexible link 13 (thrown over the guide pulley 14) to the load 15. The additional counterweight 16 provides constant friction at the upper fixation point of the cable (connection node of the wellhead suspension with the counterweight) located between the pulleys.

Thus, the proposed constructive solution will make it possible to use the stand in laboratory conditions and increase the range of studies.

Claims (2)

1. A stand for a chain drive of a downhole rod pump, containing a frame with an electric motor installed on it, a flexible link and a pulley, characterized in that it includes a gearbox connected to the electric motor, and a mechanism that converts rotational motion into reciprocating motion, consisting of a leading and driven sprockets, covered by a traction chain, having a tensioner and connected to a carriage, connected to a counterweight installed with the possibility of movement along the guides, and transmitting further movement with the help of a flexible link through the pulleys to the load, simulating a column of rods with an additional counterweight in the flexible link fixation unit between the pulleys, providing constant friction during the operation of the stand. 2. The stand according to claim 1, characterized in that the mechanism is configured to set the rotation of the traction chain due to the chain transmission and use roller and toothed chains in operation.

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