RU2219336C2 - Telemetering system controlling downhole parameters - Google Patents

Abstract

FIELD: drilling of holes, control over downhole parameters in process of drilling. SUBSTANCE: proposed telemetering system contains transmitter and electronic equipment assembled in the form of modules and including power supply unit, transducers of measured parameters and data processor. Modules of electronic equipment are set right in drill pipe after transmitter. Module with transducers of measured parameters is placed beneath, at maximal distance from joints of drill pipe. Centralizers which interjoin modules are installed between individual modules. Lowest centralizer showing free side is positioned in addition. Each module is fixed by mobile bushing placed on corresponding centralizer and nut pressed against face of module against turn. Teeth are made on faces of mobile bushing and bodies of modules. Both sides of centralizers can have connecting threads, connectors and concentric grooves to accommodate sealing rings. Mobile bushings of centralizers are mounted for axial movement alone and are fixed against turn by guiding screws or lock-pins. Lowest centralizer can be closed on free side by cover carrying on face same teeth as on faces of mobile bushing and bodies of modules. EFFECT: secured anchoring and protection of downhole equipment against high pressure, provision for uninterrupted operation of downhole equipment, increased measurement accuracy. 4 cl, 4 dwg

Description

The invention relates to a technology for providing drilling for oil, gas and for other purposes. Specifically, the invention is intended to determine the spatial orientation of the layout of the bottom of the drill string, as well as the operational control of the drilling of directional and horizontal wells.

The well-known telemetry system “Slaughter” according to the report of VNIIGIS, 1993, having a modular layout and containing modules of technological, geophysical and inclinometric converters, a turbogenerator, a transmitter module, an electric separator. The disadvantage of the telemetry system is the presence of body parts, the design of which has high rigidity, limiting the radius of the trajectory when drilling directional wells.

Known telemetry system according to the patent of the Russian Federation No. 2105880, MCP 6 E 21 V 47/12, including a drill string, a housing, a power supply, measuring modules, a transmitter module, an electrical splitter. The diameters of the housing of the measuring modules and the power supply are made smaller than the inner diameter of the drill string. The individual modules are interconnected by flexible in the radial direction and rigid in the longitudinal direction of the bonds. As a connection between the modules, radially flexible metal pipes with a diameter smaller than the diameter of the module casing were used. Centralizers are located on the pipes at the base of the modules, and inside the pipes are electric wires that provide electrical communication between the modules. The complexity of the design leads to a decrease in reliability and increases the time to prepare the telemetry system for work. A significant drawback of the telemetry system is also the lack of fixation of modules and centralizers from a turn, which reduces the accuracy of measuring inclinometric parameters, as well as depressurization of the module housing and failure of electronic equipment.

The objectives of the invention are:

- providing fastening and protection of downhole equipment from high pressure;

- ensuring the smooth operation of downhole equipment,

- improving the accuracy of measurements,

- providing convenience in work,

- increasing the speed of installation and dismantling of the telemetry system in the composition of the drill string.

These problems are solved by the new layout of the telemetric monitoring system for downhole parameters.

The downhole telemetry monitoring system includes a transmitting device and electronic equipment, including a power supply, sensors of measured parameters, data processing electronics. The electronic equipment is mounted in the form of modules that are installed directly after the transmitter in the drill pipe, and centralizers are installed between the individual modules. Each module is fixed from rotation by a movable sleeve mounted on a centralizer and pressed against the end of the module housing by a nut. At the ends of the movable sleeve and the module housings, teeth are made that engage during assembly. The movable hubs of the centralizers can only axially move and are secured against rotation by guide screws or pins. The centralizer has connecting threads, connecting sockets and concentric grooves for sealing rings on both sides, which ensures the electrical connection of individual modules and the tightness of electronic equipment. The lower centralizer is closed on the free side by a cover having the same teeth on the end face as on the ends of the movable sleeve and the module housings.

The use of these units and parts made it possible to reliably mount electronic equipment and ensure its operability in downhole conditions at high pressure and temperature, as well as reliably center and fix a module with inclinometric sensors from a turn, which made it possible to increase the measurement accuracy.

Patent studies have shown that the proposed technical solution has novelty, industrial applicability and inventive step, i.e. satisfies the criteria of the invention. The inventive step is confirmed by the fact that a new set of essential features provides new technical results.

The invention is illustrated in figures 1-3, where

figure 1 shows the downhole telemetry system,

figure 2 shows the connection of individual modules with a centralizer,

figure 3 shows an embodiment of the teeth, which provide fixation of the module housing with a movable sleeve from a turn,

figure 4 shows a view of the teeth from the side of the end.

The telemetry system for monitoring downhole parameters includes a transmitting device 1 and electronic equipment, including a power supply, sensors of the measured parameters, data processing electronics. The electronic equipment is mounted in the form of modules 2, which are installed immediately after the transmission device in the drill pipe 3, and centralizers 4 are installed between the individual modules. Each module is fixed against rotation by a movable sleeve 5 mounted on the centralizer 4 and pressed against the end of the module case by nut 6. On the ends of the movable sleeve and the module housings have teeth 7 and 8, which are engaged during assembly. The movable hubs of the centralizers have only axial movement and are secured against rotation by guiding screws or pins 9. The centralizer has connecting threads, connectors 10 and concentric grooves for O-rings on both sides 11. The lower centralizer is closed on the free side by a cover 12 having such an end the same teeth as on the ends of the movable sleeve 5 and the cases of the modules 2.

The telemetric system for monitoring downhole parameters works as follows. Sensors of measured parameters record temperature, pressure, magnetic field, etc. The received information goes to the data processing electronics, where the information is processed, and goes to the transmitting device 1, which generates a signal for transmission to the surface. The power supply provides electronic equipment with electricity. To reduce the error in measuring the magnetic field necessary to determine the azimuth of the well, the sensors of the measured parameters are located below, which corresponds to the maximum distance from the steel locks of the alloy drill pipe 3. Centralizers 4 connect the individual modules 2 to each other, orient the modules in the drill pipe. When assembling the module with the centralizer, the rotary connector is electrically connected, and the module is connected to the centralizer by sealing rings 13. The movable sleeves 5 of the centralizers are fixed against rotation by the guide screws or pins 9. Each movable sleeve 5 mounted on the centralizer 4 enters with its teeth 7 in engagement with the teeth 8, made at the end of the module, and is fixed with a nut 6, which prevents its axial displacement, as well as the rotation of the module. The angle α formed by the tooth is less than half the angle β formed by the tooth and the cavity, which allows for free assembly of the module and the centralizer.

The application of the invention allowed:

1. To secure and protect the downhole equipment from high pressure and temperature.

2. Improve measurement accuracy.

3. To ensure uninterrupted operation of downhole equipment.

4. To ensure the unification of the details of the telemetry system.

5. Reduce the complexity of maintenance during the operation of the telemetry system.

Claims (5)

1. A downhole telemetry monitoring system containing a transmitting device and electronic equipment mounted in the form of modules and including a power supply unit, sensors of measured parameters and data processing electronics, while the electronic equipment modules are installed after the transmitting device directly in the drill pipe and between the individual modules are installed centralizers, characterized in that the module with the sensors of the measured parameters is located below, at the maximum distance from the drill pipe locks, cent Ator connect modules to each other, wherein the bottom additionally introduced centralizer having a free side, and each unit is fixed by turning the movable sleeve mounted on the corresponding centralizer and pressed against the end face of the nut unit. 2. The telemetry system for monitoring downhole parameters according to claim 1, characterized in that the teeth are made at the ends of the movable sleeve and the module bodies. 3. The telemetry system for monitoring downhole parameters according to claim 1 or 2, characterized in that the movable hubs of the centralizers are only able to axially move and are fixed from rotation by guide screws or pins. 4. The telemetry system for monitoring downhole parameters according to any one of claims 1 to 3, characterized in that the centralizers on both sides have connecting threads, connecting sockets and concentric grooves for the sealing rings. 5. The telemetry system for monitoring downhole parameters according to any one of claims 2 to 4, characterized in that the lower centralizer is closed on the free side by a lid having the same teeth on the end as on the ends of the movable sleeve and the module housings.

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