RU2108439C1 - Device for fixing power cable to pump-compressor pipes - Google Patents

Abstract

FIELD: bore-hole drilling technology. SUBSTANCE: this relates to safety devices of cable lines for powering subsurface electric motors used as drives of centrifugal pumps in recovering oil and other underground fluids. Improved reliability of fastening power cable to pump-compressor pipes during round-trip operations, prevention of wedging device by casing string, protection of pump-compressor pipes from longitudinal and lateral vibration are achieved due to embodiment of device in the form of integrally cast body with slot for placing cable and pivotally arranged covers which clamp device to pipe at top and bottom of connecting sleeve by means of screws. EFFECT: higher efficiency. 2 dwg

Description

 The invention relates to the oil industry and can be used to attach a power cable to tubing for pumping oil.

 A device is known for fastening long products to tubing, containing a metal clamp and two fastening nodes located respectively in the middle and rear parts of the clamp (ed. St. USSR N 994678, class E 21 B 17/00, 1983).

 However, this design is unreliable in operation, since there is a danger of the tail part loose through the slot in the body of the clamp and it falls into the well.

 A device for attaching a power cable to tubing, containing a centralizer mounted on the upper end of the coupling and provided with a bracket on its lower end, is rigidly connected with the centralizer by a longitudinal bar [1].

 However, this device does not adequately protect the cable from abrasion and destruction, and the operations of installing it on the pump pipe string during tripping operations are very time-consuming, since manual removal of the device is necessary to unscrew the pipe connection.

 In terms of technical nature, the closest to the proposed device is a device for attaching a power cable to tubing, containing a solid body with a longitudinal groove for laying the motor power cable, windows for fixing the device on the upper and lower ends of the coupling, made at a height of not less than the height of the coupling, and ties connecting the upper and lower parts of the housing [2].

 The disadvantages of this device design are the inability to reuse it due to deposition of paraffin and salts on springs with stops, as well as the unreliability of the device due to high shock loads during tripping operations, which lead to the opening of the body and its jamming between the tubing and casing string.

 The technical result of the invention is to increase the reliability of fastening the cable to the tubing in vertical, directional and horizontal wells by protecting the cable from mechanical stress from the sleeve and the tubing string to prevent abrasion and crushing, as well as protecting the tubing string compressor pipes against longitudinal and transverse vibrations and scrolling.

 This is achieved by the fact that in the device for attaching the power cable to the tubing containing a solid body with a longitudinal groove for laying the motor power cable, windows for fixing the device on the upper and lower ends of the coupling, made at least the height of the coupling and the tie connecting the upper and lower parts of the casing, and the upper and lower parts of the casing are provided with corresponding upper and lower covers, each of which is mounted on a hinge and has a screw for fastening to the corresponding threaded hole Only the upper and lower parts of the housing.

 In addition, the ratio of window height to cover width exceeds 2: 1.

 In FIG. 1 and 2 show the design of the device in expanded form.

 A device for attaching a power cable to tubing contains a housing 1 with windows 2, 3 and ribs 4 forming a groove 5 for installing cable 6 along its entire length.

 The upper and lower parts of the casing are connected by ties 7, 8. In the upper and lower parts of the casing 1 there are covers 9, 10 with hinges 11, 12, which press the cable 6 to the pipe 13 and are connected to the casing 1 by screws 14, 15. Windows 2, 3 made with a height not less than the height of the coupling and are used to fix the device on the upper and lower ends of the coupling 16.

 The ratio of window height to cover width exceeds 2: 1.

 A decrease in this ratio leads to excessive use of metal, and a significant increase reduces the reliability of fastening.

 For installation on the pump pipe string, the housing 1 is placed on the body of the pipe 13, raised above the surface of the well so that the middle part of the housing covers the coupling 16. The cable is placed in the groove 5. After that, the housing 1 of the safety device is pressed against the sections of the pump pipe 13 located on top and from the bottom of the coupling 16, and is fixed by means of screws 14, 15. In this case, the cable is fixed by the inside of the groove 5 of the safety device to the outer surface of the coupling 16. Therefore, the cable does not test mechanical iCal loads from the pump pipe during the installation of downhole equipment and its operation in a well.

 A cable fastening device is installed along the entire length of the tubing string at the joints of the couplings and can reliably protect the cable from mechanical influences from the sleeve and tubing string, and the pipes themselves from longitudinal and transverse vibrations and scrolling.

Claims (1)

 1. A device for attaching a power cable to tubing, comprising a solid body with a longitudinal groove for laying the motor power cable, windows for fixing the device on the upper and lower ends of the coupling, made at a height not less than the height of the coupling, and couplers connecting the upper and the lower part of the housing, characterized in that the upper and lower parts of the housing are provided with corresponding upper and lower covers, each of which is mounted on a hinge and has a screw for fastening to the corresponding threaded hole the upper and lower parts of the case, and the ratio of the height of the window and the width of the cover exceeds 2: 1.

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