RU2277636C1 - Telemetering system emitter having communication channel to transmit information along pipe string in the form of magnetic signal - Google Patents

Abstract

FIELD: oil and gas well drilling and operation, particularly to transmit information from well to day surface through wireless communication channel.

SUBSTANCE: emitter is made as pipe with conical connection thread and sub adapted to receive centrator. The centrator is restricted from axial and radial displacement. Coupler to establish communication with downhole tool is arranged in the centrator. Transmitting coil is wound around outer pipe surface. One coil lead is connected with coupler, another lead is connected to pipe body. The pipe may have protective thickening in pipe center so that the coil is arranged between the protective thickening and sub. Isolation layer is connected to the pipe. Coil may be also provided with protective coating or shell.

EFFECT: possibility to transmit signals through shielding formations having high permeability and provision of downhole tool workability in casing pipe.

5 cl, 1 dwg

Description

The invention relates to systems for transmitting downhole information during drilling and during oil or gas production.

A known telemetry system for transmitting downhole information through a hydraulic communication channel according to the application of the Russian Federation No. 96121043, comprising a ground part connected by a hydraulic communication channel to a downhole part, which includes a downhole motor, diverter, a hydraulic information pulse generating unit with an actuator and a drive connected to an electric generator having a drive, characterized in that the drive of the generator is made in the form of a curved roller, a gearbox with an electromagnetic clutch and a screw pair, with than one end of the roller is connected to the shaft of the downhole motor, and the other to the gearbox, which is mounted with the possibility of transmitting movement through screw pairs to the diverter and directly to the electric generator mounted on the same axis as the drive of the hydraulic information pulse generating unit, the actuating organ of which is adjustable passage of flushing fluid into the annulus.

The disadvantage of systems with a hydraulic communication channel is the design complexity and high cost.

Known downhole telemetry system with an electromagnetic communication channel according to the patent of the Russian Federation No. 2193656, capable of operating in conditions of shielding layers, in which the emitter is located above the shielding layers, and the downhole tool is near the downhole motor. The connection of the downhole tool with the emitter is carried out using a cable having a long length, which is a disadvantage. The upper part is an electric separator, which acts as a dipole formed as a result of the electrical separation of the drill string. The lower part of the downhole tool is installed in the layout of the bottom of the drill string above the downhole motor, centered and fixed in the landing device.

A known emitter of a telemetric system with a communication channel transmitting information by a magnetic signal along a pipe string according to A. St. USSR No.608051, class G 01 D 5/12, publ. 05/05/1978, prototype.

The disadvantages of the system are its inoperability in the frequency range specified in the description, the restriction on the depth of transmission and the inability to use casing in the string.

The objectives of the invention are to provide signal transmission through shielding formations with high conductivity and ensure the operability of a downhole tool in a casing string.

The solution to these problems was achieved due to the fact that the emitter of the telemetry system with a communication channel transmitting information by a magnetic signal through a pipe string, including a coil connected to a downhole tool, is made in the form of a pipe with a conical connecting thread and an adapter, inside which a centralizer with concentric it has a connector for communication with the downhole tool, while the centralizer is fixed from axial and radial displacement, the coil is wound on the outer surface of the pipe, with one coil is connected to said connector and its other terminal coupled to the body tube. The pipe is made with a tread thickening in the middle part, the coil is wound between the tread thickening and the sub. An insulating layer is made on the pipe. The coil is externally coated with a protective coating or casing.

Studies have shown that the proposed technical solution has novelty, inventive step and industrial applicability. The novelty is confirmed by patent research, the criterion of "inventive step" - new properties, due to a combination of essential features. To implement the technical solution does not require scarce materials and new technologies.

The invention is illustrated in the drawing.

A radiator of a telemetry system with a magnetic communication channel (Fig. 1) of a pipe 1 with tapered threads 2 at the ends and a transmitting coil 3 wound on the pipe 1. A tread thickening 4 can be made on the pipe 1 in the middle part. In this case, the transmitting coil 3 is wound on the bottom of the pipe 1. On the pipe 1, under the transmitting coil 3, it is desirable to apply an insulating layer 5, and on the transmitting coil 3 - a protective coating or casing 6. The radiator of the telemetry system contains adapters 7, screwed with the pipe 1 through a tapered thread 3. In the lower transfer ke 7 mounted centralizer 8 with radial ribs 9, in one of which a hole "A" is made. In the lower sub 7 there is a transverse hole "B" aligned with the hole "A", and a longitudinal hole "C" and a plug 10 covering the transverse hole "B" from the outside. Through holes "A", "B" and "C" passes the first output 11 of the transmitting coil 3, which connects the transmitting coil 3 to the connector 12 of the downhole tool (downhole tool is not shown). The second terminal 13 of the transmitting coil 3 is connected to the pipe 1.

The emitter is installed in the composition of the drill string or casing in its lower part (pipe string not shown). An electrical signal containing information about the downhole parameters, from the output of the downhole tool through the connector 12 through the first output 11 is supplied to the transmitting coil 3. The electrical signal in the transmitting coil 3 is converted into a magnetic signal, which is transmitted through the pipe 1, the upper sub 7 and the pipe string to the surface where it is perceived by the receiving coil (receiving coil not shown).

The application of the invention allowed:

1. For the first time to create a telemetry system operating on a magnetic communication channel.

2. To transmit downhole information without distortion through shielding layers with high conductivity.

3. To ensure the transmission of downhole information when installing a telesystem in a casing string, which is very important when drilling sidetracks from cased wells.

Claims (5)

1. A radiator of a telemetry system with a communication channel transmitting information by a magnetic signal through a pipe string, including a coil connected to a downhole tool, characterized in that the radiator is made in the form of a pipe with a conical connecting thread and an adapter, inside which a centralizer is concentric with the centralizer located in it a connector for communication with the downhole tool, while the centralizer is fixed from axial and radial displacement, the coil is wound on the outer surface of the pipe, while one output of the coil is connected said slot and its other terminal coupled to the body tube. 2. The emitter according to claim 1, characterized in that the pipe is made with a tread thickening in the middle part, the coil is wound between the tread thickening and the sub. 3. The emitter according to claim 1 or 2, characterized in that the pipe is made of an insulating layer. 4. The emitter according to claim 1 or 2, characterized in that the coil is externally coated with a protective coating or casing. 5. The emitter according to claim 3, characterized in that the coil is externally coated with a protective coating or casing.