RU176488U1 - Ball screw drive sucker rod pump - Google Patents

Abstract

The deep-groove ball screw drive of the sucker rod pump is designed to drive a borehole sucker rod pump with a vertical rod during the lifting of oil and gas wells. The drive consists of a coaxially assembled electric drive with a hollow shaft to accommodate a screw, ball screw or roller screw drive, consisting of a screw and nuts with rolling elements, screw guide, polished rod connection unit for the rod string. The drive is designed to be mounted directly on the flange e column head and does not have a massive frame on a separate foundation, this simplifies the design, reduces the weight and dimensions of the drive. The simple design of the conversion mechanism, consisting of high-tech components (screw, nut), increases the reliability of the drive, the convenience and speed of its maintenance. As a result the cost of the drive itself, its installation, transportation and maintenance is reduced. Which is especially true in conditions remote from the infrastructure.

Description

Technical field

The inventive utility model relates to the field of petroleum engineering, and in particular to pumping systems for oil production using the installation of sucker rod pumps.

State of the art

Known unbalanced rocking machine (patent RU 2482332 C1, 05/20/13). It contains a support, a gear motor with a nut rigidly fixed at the lower end of its driven shaft and a tape screw with a lower end attached to the rod. The driven shaft of the gearmotor is made in the form of a pipe, the lead screw is installed in the driven shaft from the bottom coaxially.

The disadvantage is the nut mechanism, which is a single unit manufactured, and therefore has a high cost and low reliability. The nut assembly also has a low load capacity, since the number of rollers is limited by their dimensions, and the load is perceived by the cantilever rim of the roller. Also, with this arrangement of equipment, to replace a polished rod, it is necessary to completely dismantle the drive.

The closest technical solution is the electromechanical drive of the sucker rod pump of the producing well (patent RU 160381 U1, 03.20.2016), which contains an electric motor, a welded steel frame, a working screw, a guide roller, a fixed bracket with fixing balls, a flexible cable and a counterweight mechanism. A roller is installed on the upper platform of the welded steel frame, the rim of which is made in the form of a semicircular cell, and a flexible cable is thrown through it, its right hanging end is connected with the upper end of the guide roller, and the left hanging end is with a counterweight installed in special guide carriages. The reciprocating movement of the SHG rod is provided by the electrical system of the end switching devices. Inside the hollow rotor of the electric motor there is a rotor screw with ball screw transmission (ball screw). The upper end of the rotor is connected to the lower end of the guide roller, which moves inside the fixed bracket with balls, which is fixed to the steel welded frame and allows the rotor to perform only up-and-down motion without rotation around its geometric axis.

The disadvantage here is the presence of a large steel frame to support the structure and counterweight, as well as the need for a foundation for installing the drive.

Disclosure of a technical solution

The task this model aims to solve is to simplify the design, reduce the weight and dimensions of the drive, and refuse to build the foundation for installing the drive.

This goal is achieved by a ball screw drive of a sucker rod pump (ШВП ШГН), consisting of a base, an electric drive, a ball screw, as well as a roller screw drive, consisting of a screw and a nut with rolling elements, a screw guide, and a polished rod connection unit for connecting the rod string. The electric drive has an output shaft with a through hole. The base is located concentrically to the hollow shaft of the drive, which allows you to install it on the flange of the column head. The through hollow shaft of the drive allows the screw to pass through, which, in combination with the hollow screw, allows you to place the wellhead rod inside the installation, this makes it possible to replace it through the top cover without dismantling the entire drive.

The combination of design solutions allows you to make a simple, lightweight and compact drive, and abandon the construction of the foundation for the drive. This will increase the reliability of the drive, reduce the cost of manufacture, transportation, installation and maintenance.

The drive may further comprise the following elements:

- rod rotator designed for forced rotation of the rods;

- energy recovery device using a counterweight;

- energy recovery device using a pneumatic accumulator;

- energy recovery device using a spring;

- energy recovery device, by operating the engine in a generator mode when the rod string moves down.

Description of drawings

The figure shows a section of a ball screw drive of a sucker rod pump, in accordance with the claimed utility model.

The following notation is used in the circuit:

1 - support 7 - guide 2 - base 8 - nut 3 - wellhead stock 9 - screw 4 - electric motor 10 - shaft 5 - case 11 - thrust bearing 6 - cover 12 - damper

Utility Model Implementation

The pump drive is installed directly at the wellhead on the flange of the column head and is fastened with a support 1 with studs. The base 2 is designed to install the motor housing 5 at a given height, and serves as an oil bath. The reversing electric motor 4 has a hollow rotor connected to the hollow shaft 10, which drives the ball screw 8. The nut rotates the screw 9, which has a through hole to accommodate the wellhead 3. During each stroke, the screw is lubricated by immersion in oil, poured into the base 2. The wellhead rod 3 is installed on the guide 7, which runs in the grooves of the cover 6, and serves to perceive the reactive moment on the screw. The wellhead is not fixed along the axis, and is able to move inside the screw in case of sticking of the stem or pump. Damper 9 is designed to support the screw in the lower position when stopping repairs, and to prevent it from going beyond the operating range in the event of equipment failure.

Claims (8)

1. A ball screw drive of a sucker rod pump, including a base, an electric drive, a ball screw, consisting of a screw, a nut with rolling elements, an attachment unit for the wellhead rod, a screw guide, characterized in that the electric drive has a hollow through shaft and the base is concentric with hollow shaft. 2. Ball screw drive of a sucker rod pump according to claim 1, characterized in that the screw is made with a through axial hole designed to accommodate a polished rod. 3. The ball screw drive of the sucker rod pump according to claim 1, characterized in that it comprises a support bearing assembly for supporting the sucker rod. 4. The ball screw drive of the sucker rod pump according to claim 1, characterized in that it comprises a rotator. 5. The ball screw drive of the sucker rod pump according to claim 1, characterized in that it has a device for energy recovery using a counterweight. 6. The ball screw drive of the sucker rod pump according to claim 1, characterized in that it has a device for energy recovery using a pneumatic accumulator. 7. Ball screw drive of a sucker rod pump according to claim 1, characterized in that it has an energy recovery device using a spring. 8. The ball screw drive of the sucker rod pump according to claim 1, characterized in that it has an energy recovery device by operating the engine in the generator mode when the rod string moves down.

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