The section of the electrical power supply to the electric drill

 

The invention relates to elektrobudowa technique, namely the electrical power supply of electric drills designed for drilling oil and gas wells. The technical result is to increase the reliability of the cable sections. Section includes drill pipe, provided with a nipple and coupling pipe lock and cable section containing a segment of a two-wire cable that ends mounted on poles in the tube lock cone socket and rod split pin connections. This releasable contact connection cable section is made in the form of a coaxial connector formed concentrically mounted in insulating bushings hollow cylindrical conductors, which on the one hand connected to the cable conductors, and on the other end of the contact tip, and at the entrance into the connector at the base of the tapered coupling socket with a pin installed collet clamping device. 2 C.p. f-crystals, 4 Il.

The invention relates to elektrobudowa technique, namely the electrical power supply of electric drills designed for drilling oil and gas wells.

The known leads to an electric drill according to the scheme two wires - pipe, consisting of seriesii segment of a two-wire cable, ending mounted on poles in the tube lock cone socket and rod split pin connections [1].

The main disadvantage of the known sections of the electrical power supply is a low reliability due to frequent failure of the cable sections.

The most common types of damage to the cable sections are (Arkhangelsk N. To. Improvement of the electrical power supply for electric drills. In the book “Elektrobosna”. - M., 1964);

- a breakdown of insulation on the surface of the connector cable connection between the contact rings and breakage of the copper conductive Chinook connecting cable conductor with the contact lugs (65%);

- a breakdown of insulation in places splicing the wires of the cable with split pin connections (15%);

- a breakdown of insulation of the wires of the cable (5%);

external mechanical damage to the contact connections (15%). The reasons listed damages are design defects have used cable sections, which include:

- weak protection of contact joints with tapered rubber seal against the penetration of drilling fluid;

- rigid fastening of the cable section in the tube lock, resulting in the presence of exce who becomes significant mechanical stresses, contributing to the destruction of the tavern under the action induced by the drilling of dynamic loads;

- use in contact connections Chinook rectangular cross-section, resulting in the connector inhomogeneous electric field that facilitates the breakdown of insulation;

- the abrupt change of the cross-section of the flushing channel in the drill pipe in places of fastening of the cable sections, resulting in the conditions for the occurrence of cavitation and external damage under the influence of the contact connection;

- a relatively large cross-section cable section, and therefore the pressure loss of drilling fluid in the drill pipe reaches 50%.

The closest known sections of the busbar to the present invention is the clutch cable section of the electrical power supply of the electric drill [2].

In this invention to prevent breakdown in the contact connection socket cable section provided with a chamber filled with liquid dielectric, which, according to the authors, should be ousted from the camera in the drilling process when the compression external hydrostatic pressure and thereby prevent the ingress of drilling fluid into the connector. However, generated inside this clutch pratipada is blocki camera and therefore is not precluded by the penetration of drilling fluid into the connector. In addition, in this connection, as in other known cable sections, no centering socket with a pin when connecting pipes, resulting in a conical connection of the connector may occur unilateral gap, which will also facilitate the penetration of the liquid into the slot.

The objective of the invention is to eliminate the above drawbacks, i.e., improving the reliability of the cable sections.

This task is solved in that section of the electrical power supply to the electric drill includes a drill pipe, provided with a nipple and coupling pipe lock and cable section containing a segment of a two-wire cable that ends mounted on poles in the tube lock cone socket and rod split pin connection, with split pin connection cable section is made in the form of a coaxial connector formed concentrically mounted in insulating bushings hollow cylindrical conductors, which on the one hand connected to the cable conductors, and on the other end of the contact tip, and at the entrance into the connector at the base of the tapered coupling socket with a pin installed collet clamping device.

Support to the x ring, placed in the grooves of the coupling and nipple lock and cable section is made on a segment of coaxial cable.

A comparison of the claimed technical solution prototyping allows you to establish they meet the criterion of “novelty”. The study of other technical solutions in this field of technology features that distinguish the invention from the prototypes, have not been identified and because they provide the claimed technical solution according to the criterion of “significant differences”.

In Fig.1 shows a General view of the section of the electrical power supply to the drill Assembly with the drill pipe and cable section in Fig.2 is a view of the end section of the electrical power supply, and Fig.3 and Fig.4 - sections of the contact rod and the socket on the planes A-a and B-B.

Section busbar (Fig.1 and Fig.2) includes a segment of coaxial cable 1, a two-prong terminal 2 based 3 forming a coaxial pin socket 4-led 5 coaxial connector. The supports 3 and 5 cable sections are fastened by screws to the movable in radial and angular directions of the 6 rings placed in grooves of the nipple 7 and the clutch 8 tube lock drill pipe 9.

Contact rod 2 (Fig.3) contains two concentric installed and isolated between a sleeve 1o cable 1, which is the output of the conductor 11 is soldered to the free end of tip 14. The conductor 12 on one side welded to the outer conductor 15 (braided cable), and on the other hand ends in a tip 16. The sleeve 10 between the lugs 14 and 16 is made cone 17 and the other end is a conical recess 18, coupled to a terminating end of the cable insulation. On the cylindrical conductor 12 is fixed an insulating sleeve 19, which is equipped with a metal ferrule 20, ending on one side of the support 3, while the other is freely mounted a conical sleeve 21 collet clamp, tucked up by the spring 31. Pin 4 (Fig.2), as well as terminal 2, contains two concentric installed and isolated between the sleeve 22 (Fig.4) cylindrical conductor 23 and 24, the ends of the contact lugs 25 and 26. The conductor 24 is pressed insulating sleeve 27, which is seated the yoke 28, similar to the clip 20, but unlike it has on the split end of the collet 29 located above the base of the conical part of the sleeve 27.

The device operates as follows.

Screwing the drill pipe through the coupling 8 and pin 7 pin 2 of one cable section is included in the socket 4 of the other sections, this prouchvania conical sleeve 21 presses the collet 29, that creates a reliable seal of the connector. In addition, due to the clamping gripper 29 and installation of cable sections on the movable ring 6, the rod 2 at the time of connection doesn't move around in the nest, which excludes the appearance of the contact connection torque.

Terminal 2 and the socket 4 are detached from the cable during repairs by removing the isolation and disconnection of the wires of the cable from the conductors of the Jack in the positions indicated by the position 30.

Sources of information

1. USSR author's certificate No. 202022, E 21 In 17/02, 1967.

2. Fomenko F. N. Drilling by the drill. - M.: Nedra, 1974, S. 116, Fig.52.

Claims

1. The section of the electrical power supply to the electric drill, comprising a drill pipe, provided with a nipple and coupling pipe lock and cable section containing a segment of a two-wire cable that ends mounted on poles in the tube lock cone socket and rod split pin connection, characterized in that the releasable contact connection cable section is made in the form of a coaxial connector formed concentrically mounted in insulating bushings hollow cylindrical conductors, which on the one hand connected to the cable conductors, and is NESDA with the rod installed collet clamping device.

2. Section under item 1, characterized in that the support is fixed on a movable, having the ability to move in the radial and angular directions rings placed in grooves of the coupling and the nipple of the castle.

3. Section under item 1, characterized in that the cable section is made on a segment of coaxial cable.

 

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