The ac generator to power the autonomous downhole geophysical and navigation systems

 

(57) Abstract:

The invention relates to drilling wells and is used to power Autonomous downhole navigation and geophysical instruments in the drilling process. The objective of the invention is to increase the life and reliability of the turbine, increasing capacity while reducing the size and weight of the generator. This generator comprises a sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices. The rotor is constructed in the form of the outer case, the outer side of which the edges of the installed rotor blades of the turbine, and on the inner side mounted permanent magnets. On the shaft with the two sides set the electrical connectors. One of the sealing devices supplied by spring and installed with the possibility of axial movement. This compensates for pressure and temperature expansion of the lubricating liquid of the bearing assemblies and in the gap between rotor and stator. Sealed stator is made in the monolith of electroconductive and non-magnetic material, such as stekloplasta for other purposes. Specifically the invention is intended to convert the energy of the drilling fluid in electrical and power electricity Autonomous downhole navigation and geophysical instruments in the drilling process.

Known AC generator to power the Autonomous downhole during drilling of small diameter, comprising a stationary inner stator with header and fixed on the drive shaft of the external rotor, equipped with electromagnets (RF patent N 2060383, MCP E 21 In 47/022, 47/00 priority from 21.02.92 year).

Known AC generator to power the Autonomous downhole geophysical and navigation complexes containing a turbine driven by the flow of drilling fluid, oil flooded the stator is filled epoxy compound, and the rotor of the alternator with permanent magnets located on the same shaft with the turbine (Molchanov, A. A., Shiraev A. H. Downhole Autonomous system with magnetic registration, M., Nedra, 1979, S. 102-103). He adopted as the nearest equivalent.

This generator consists of a stator located inside the generator, and a six-pole magnetic ring rotor made from the outside. what using blades of the turbine, in turn, there are three stages of guide vanes collected in an external enclosure that increases the diameter of the device. The electrical connectors are on the bottom of the generator.

To prevent the ingress of drilling fluid into the generator and bearing assemblies installed sealing device, the internal cavity of the generator is filled with transformer oil.

Due to the fact that the turbine operates at different temperatures (from external air temperature up to +80...+130oC at depths of drilling wells up to 1200. . . 3500 m and more), and the oil has a high coefficient of thermal expansion, introduced the compensator pressure and thermal expansion of lubricating fluid (oil). The compensator pressure and thermal expansion lubricating fluid made in the input fairing generator. It consists of two thin core plates, one of which is convex and the other concave.

The compensator pressure and thermal expansion of lubricant is designed to compensate for changes in the volume of oil in oil-filled cavity of the generator in operating conditions when the temperature and pressure inside the reliability, low capacity, large weight and dimensions of the device. In addition, the generator is very complex in design and ethnological. These shortcomings are due primarily to the fact that the drive turbine is used with the guide apparatus. The use of turbines with the alignment apparatus as actuator imposes high requirements to the quality of cleaning mud from fractions of drilling cuttings and other foreign objects, ingress of which the gap between the workers and the guide blades of the turbine may cause the system to stop (jamming). The presence of the guide vanes of the turbine increases the diametrical dimension of the generator, which is not desirable when drilling relatively small diameter.

The second design flaw is the complexity and unreliability of the pressure compensator and thermal expansion of lubricant. Due to the elasticity of the walls of the compensator pressure of lubricant is always less than the ambient pressure. This can lead to the ingress of drilling fluid into the lubrication system.

A further disadvantage associated with the location of all connectors on one side of the generator that obuslovlen and devices, requiring connection from the top, such as, for example, equipment used to transmit telemetry data to the surface of the fluid channel of communication.

Objectives of the invention are to increase the life and reliability of the generator, the power increase with a simultaneous decrease in size and weight of the generator.

This is achieved by the fact that in the proposed AC generator to power the Autonomous downhole geophysical and navigation complexes containing sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices, and made in the form of the outer case, the outer side of which is equipped with rotor blades of the turbine, and on the inner side mounted permanent magnets and mounted on the shaft of the electrical connectors; one of the sealing devices is supplied by a spring and mounted for axial movement to provide pressure compensation and temperature expansion of lubricating fluid, located in the bearing assemblies and in the gap between rotor and stator, with the electrical connectors are located on dwite of electroconductive and non-magnetic material, for example fiberglass.

Conducted patent and technical studies have shown that the proposed technical solution has novelty and inventive step. In addition, it is industrially applicable, i.e., can be manufactured using standard equipment.

Therefore, the proposed technical solution meets all the criteria of the invention.

The invention is illustrated in the drawing, which presents the proposed generator.

The generator consists of a stator 1, is airtight in the monolith of the electroconductive, nonmagnetic material, such as fiberglass, mounted on a stationary shaft (axis) with 2 electrical connectors 3 on the ends for connecting the electronic downhole equipment, and rotor 4 made in the form of a housing 5 mounted on the external side of the rotor blades of the turbine 6 and the inner side permanent magnets 7. The casing is placed on the bearings 8 and 9 attached to a fixed shaft (axis) 2. Bearing assemblies secured sealing devices 10 and 11, one of which 10 is movable in the axial direction and provided with a spring 12 to compensate for pressure and temperature is), the magnetic field of the permanent magnets 7 induces the appearance of an alternating current in the windings of the stator 1, which, through electrical connectors 3 is fed to the electronic sites of downhole tools (drawing downhole devices not shown).

If the generator is used to power downhole geophysical systems with electromagnetic communication channel, then use the lower electrical connector 3, and if hydraulic communication channel, the upper electrical connector 3. This provides one of the main advantages of the proposed generator is that it can be used to supply electricity to any system.

When immersing the device in the borehole during drilling or lowering and lifting operations and, accordingly, the temperature and pressure environment, changing oil and changing the position of the sealing device 10 to equalize internal and external pressure environments with some excess internal pressure.

Application of the proposed invention provides the following advantages.

1. The presence of electrical connectors on two sides of the shaft allows you to connect the generator with other devices located both above and is offered by the fluid, located at the edges (outside) the rotor blades of the turbine and fixed on the inner side permanent magnets allows to achieve the maximum possible linear velocity of the magnetic field of the permanent magnets relative to the stator windings and maximum power.

3. No apparatus which prevents jamming of the turbine in case of contact with foreign objects in the drilling fluid or poor cleaning. In addition, the refusal of the guide vanes can significantly reduce the diameter of the generator.

4. In the proposed generator rotor mounted on bearings secured small sealing devices. Supply one spring and execution of its movable in the axial direction enables it to additionally perform the function of the pressurizer and thermal expansion lubricating liquid of the bearing assemblies and in the gap between the stator and the rotor. This simplifies the construction of the generator, as it allows to eliminate the pressure compensator and thermal expansion as a separate device.

5. The implementation of the stator on the stationary hollow shaft, sealed, monolith never the organizations.

1. The AC generator to power the Autonomous downhole geophysical and navigation complexes containing sealed stator mounted on a stationary hollow shaft, a rotor mounted on bearings mounted on a stationary hollow shaft and secure sealing devices, and made in the form of the outer case, the outer side of which is equipped with rotor blades of the turbine, and on the inner side mounted permanent magnets and mounted on the shaft of the electrical connectors, wherein one of the sealing devices is supplied by a spring and mounted for axial movement to provide pressure compensation and temperature expansion of lubricating fluid, located in the bearing assemblies and in the gap between rotor and stator, with the electrical connectors are located on two sides of the shaft, and rotor blades mounted on the sides of the hull.

2. Generator under item 1, characterized in that the sealed stator is made in the monolith of electroconductive and non-magnetic material, such as fiberglass.

 

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