RU2312970C1 - Device for sucker rod operation in well - Google Patents

Abstract

FIELD: oil industry, particularly devices for suction rod protection against wear and for rod hanger protection against rotation.

SUBSTANCE: device comprises roller and hinge units. Roller unit comprises cylindrical body and rollers supported by pins and projecting over surface thereof. Rollers are grouped in several rows transversal to cylindrical body axis. Rollers of each row are arranged along a circle and spaced apart so that 120° is defined in-between. The roller axes are inclined to cylindrical body axis through 60-80°. The rollers are formed of polymeric wear-resistant material of polyurethane, polyamide or fluoroplastic type. Roller unit may be threadedly connected with similar units, hinge unit or sucker rods.

EFFECT: possibility to compensate torque load applied to rod.

5 dwg

Description

The invention relates to the oil industry and can be used to create devices for operating sucker rods in a well, which are necessary for protecting sucker rod rods from wear and rotation of sucker rods.

Known rod protector, including centering balls in contact with the surface of the tubing string and two cylindrical half-bodies, in the mating end cavity between which are placed rolling bearings of centering balls made in the form of rows of balls of smaller diameter eccentrically displaced relative to them (RF Patent No. 20112769, publ. 1994.05.15).

The known tread is complex in design, unable to compensate for the torque loads on the rods.

Closest to the proposed invention by technical nature is a rod centralizer made in sections, each section contains one roller, the sections are connected to each other by a hinge, and the centralizer is connected to the rods through rod heads pivotally connected to the centralizer sections (RF Patent No. 2176717, publ. 2001.12.10 - prototype).

The known centralizer is quite simple in design, but is not able to compensate for the torque loads on the rods.

The proposed invention solves the problem of providing compensation for the torque loads on the rods.

The problem is solved in that in a device for operating sucker rods in a well, including a roller unit with sections with rollers and connecting elements and a hinge unit, according to the invention, in the roller unit in sections, the rollers are arranged in rows, the rows are perpendicular to the axis of the roller unit, in each row the rollers placed in axes around a circle through 120 ° with the inclination of the axis of rotation of each roller to the generatrix of the roller unit at the location of the roller 60-80 °, the rollers are mounted protruding above the surface of the roller unit, the roller made of wear-resistant polymer material such as polyurethane, polyamide, polytetrafluorethylene, and connecting elements at the ends of the cylindrical hinge unit adapted to condition fixing the second end of the second cylindrical hinge assembly in a first end of the first cylindrical hinge unit.

Figure 1 shows the roller assembly of the device for operating sucker rods in the well, figure 2-4 is a section along aa, bb, bb in figure 1, respectively.

The roller assembly consists of a cylindrical housing 1, on the surface of which rollers 2 are placed, mounted on the axles 3 for rotation. The rollers 2 and axis 3 are arranged in rows. Each row is perpendicular to the axis 4 of housing 1. In each row, 3 rollers are placed around a circle through 120 ° with an inclination of the axis of rotation 3 of each roller to the generatrix 5 of the cylindrical housing α = 60-80 °. The rollers 2 protrude above the surface of the housing 1. The rollers 2 are made of a wear-resistant polymer material such as polyurethane, polyamide, fluoroplastic.

From one end 6, the roller assembly has an external thread 7, from the other end 8, the roller assembly has an internal thread 9, a mating thread 7.

Figure 5 presents the roller assembly connected to the hinge assembly.

A sub 10 is screwed into the housing 1 of the roller assembly by a thread 9, which is screwed into a cylinder 11 with a spherical surface 12, in which a rod 13 with a spherical bearing 14 is placed. The spherical bearing 14 is mounted in the spherical surface 12 for rotation and swinging.

The device operates as follows.

In the well, the places of the greatest bends of the trunk and, accordingly, the places of the greatest abrasive loads exerted by the rods on the inner surface of the tubing string are determined. The direction of twisting of the rods as they move up and down is also determined. When installing a column of rods in places of greatest abrasive loads place the proposed device. It is possible to collect several devices sequentially through the end threads 7 and 9. Connect the devices to the hinge assemblies and rods through the threads of the last ends.

When the rods and devices move up and down, the rollers 2 set the rotation corresponding to the direction of the twisting of the rods, and the hinge assembly compensates the rotation loads and bending loads. As a result, the boom sections separated by the device cease to experience twisting loads from one section to another. By selecting the location of the device, the twisting loads on the polished rod of the rocking machine, to which the rod string is suspended, are eliminated.

A polished rod only works for raising and lowering the rods.

The application of the proposed device will provide compensation for the torque loads on the rods.

Claims (1)

A device for operating sucker rods in a well, including a roller assembly consisting of a cylindrical body with rollers mounted on the axes and protruding above its surface, a hinge assembly, characterized in that the rollers are arranged in rows perpendicular to the axis of the cylindrical body, in each row the rollers are placed along circles at 120 ° with an inclination of their axis to the generatrix of the cylindrical body at an angle of 60-80 ° and are made of polymeric wear-resistant material such as polyurethane, or polyamide, or fluoroplastic, When this roller assembly configured to couple with the same nodes, hinge assembly or sucker rods by a threaded connection.

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