RU2232888C1 - Pit-face telemetric system - Google Patents

Abstract

FIELD: drilling technology.

SUBSTANCE: system has body with electrical separator forming electrodes of well transmitter in form of two subs, and generator with fixing means and electronic block in protective container with localizer which are placed in the body. Protective container is connected to generator through dielectric insert. Electrodes of transmitter are electrically connected to output of electronic block respectively through localizer and protective container of electronic block, and fixing means and generator. Connection of generator and protective container of electronic block with dielectric insert may be hydraulically connected to inner hollow of generator. Dielectric insert and electrical separator must at least partially cover each other at level, for which upper end of dielectric insert is placed no lower than lower end of electrical separator, and lower end of dielectric insert is placed no higher than upper end of electrical separator.

EFFECT: simplified electrical connection between system assemblies.

3 cl, 1 dwg

Description

The proposed solution relates to logging systems during drilling with an electromagnetic communication channel.

Suggested scope: horizontal well drilling.

A downhole telemetry system with an electromagnetic communication channel is known, in which the downhole transmitter is installed in the upper part of the drill string, and the transmitter communicates with the downhole module and the power supply via a wireline cable (RF patent 2140539, IPC E 21 V 47/12).

A downhole telemetry system with an electromagnetic communication channel is known, in which the electric splitter is made in the form of a separate sub mounted above the downhole motor, the power supply and measuring modules are placed inside the drill string, and the electrical connection between the power supply, the measuring module and the electrodes of the transmitting device is made in the form wires placed in metal pipes, flexible in the radial direction (RF patent 2105880, IPC E 21 V 47/12).

A downhole telemetry system is known, comprising a generator located inside the casing with a device for its fastening and an electric separator and a non-magnetic insert installed after it, inside which the downhole equipment is mounted. The downhole equipment is connected to the generator and the transmitter electrodes by the cable section (PM 15585 of the Russian Federation, IPC E 21 V47 / 02 - prototype).

The well-known designs of downhole telemetry systems have one drawback: the low-tech design and long wired communication lines requiring additional protection, which drastically reduces the reliability of the systems.

The purpose of the invention: the simplification of electrical communication between nodes of the system.

The downhole telemetry system contains a housing with an electric separator forming the electrodes of the downhole transmitter in the form of two sub, placed inside the housing a generator with a mounting device and an electronic unit in a protective container with a centralizer. It is proposed that the protective container be connected to the generator through a dielectric insert, and the transmitter electrodes are electrically connected to the output of the electronic unit through the centralizer and protective container, and the mounting device and generator, respectively.

Additionally, it is proposed that the upper end of the dielectric insert be positioned no lower than the lower end of the electric splitter, and the lower end of the dielectric insert is not higher than the upper end of the electric splitter.

The connection of the generator and the protective container with the dielectric insert must be hydraulically connected to the internal cavity of the generator.

The drawing shows a downhole telemetry system: 1 - upper sub; 2 - lower sub; 3 - electric splitter; 4 - dielectric insert; 5 - generator; 6 - mounting device; 7 - electrical connector; 8 - a protective container; 9 - centralizer.

The body of the television system is separated by a dielectric layer - an electrical separator 3 and forms the upper sub 1 and lower sub 2, which serve simultaneously as electrodes of the electric dipole of the downhole transmitter of the system. A generator 5 is installed in the upper part of the television system case using the fastening device 6, to the lower end of which a protective container 8 is attached with an electronic unit installed in it (not highlighted in the drawing) and fixed by a centralizer 9 in the lower sub 2. Between the generator 5 and the protective container 8 a dielectric insert 4 is placed, and the electrical connection between the generator 5 and the electronic unit is carried out thanks to the electrical connector 7. Since the electrical splitter 3 and the dielectric insert 4 form a single th block, the upper part of the insulating downhole telemetry system from the bottom thereof, in order to avoid a short circuit between the interior of its housing, and telemetry system of the washing liquid it is desirable that the dielectric spacer 3 and the insert 4 at least partially overlap each other in the level. In a protective container 8, to ensure the working conditions of the electronics of the telesystem, a pressure close to atmospheric is maintained, and in a generator 5, a pressure close to the ambient pressure, i.e. downhole. In order to exclude the effect of the indicated pressure drop on the dielectric insert 4, the junction of the generator 5 and the protective container 8 with the dielectric insert 4 laid between them is hydraulically connected to the internal cavity of the generator 5 from the inside, i.e. the insulation layer is laid on the side of the internal cavity of the generator 5.

The power supply generated during operation by the generator 5, through the wires through the electrical connector 7, enters the electronic unit located in the protective container 8. The electronic unit controls the measurement of downhole parameters and the process of transferring them to the surface. The information measured by downhole sensors at the command of the electronic unit, is converted in the latter into a form suitable for transmission to the surface, and fed to the electrodes of the downhole transmitter - sub 1 and 2. The encoded signal to the upper sub 1 is fed through an electrical connector 7 to the generator 5 and the device mounting 6, and the voltage to the lower sub 2 - through the protective container 8 and the centralizer 9. The dielectric insert 4 isolates the generator 5 from the protective container 8, while maintaining mechanical contact between them.

The proposed construction of a downhole telemetry system allows you to implement a compact, simple, reliable, technologically advanced system and to avoid long, unreliable trunk lines.

Claims (3)

1. Downhole telemetry system, comprising a housing with an electric separator forming the electrodes of the downhole transmitter in the form of two sub, placed inside the housing a generator with a mounting device and an electronic unit in a protective container with a centralizer, characterized in that the protective container is connected to the generator through a dielectric insert, and the transmitter electrodes are electrically connected to the output of the electronic unit, respectively, through the centralizer and the protective container of the electronic unit, and the device is stronger Ia and the generator. 2. The system according to claim 1, characterized in that the upper end of the dielectric insert is located not lower than the lower end of the electric separator, and the lower end of the dielectric insert is located not higher than the upper end of the electric separator. 3. The system according to claim 1, characterized in that the connection of the generator and the protective container of the electronic unit with the dielectric insert is hydraulically connected to the internal cavity of the generator.