RU27632U1 - TURBOGENERATOR FOR NUTRITIONAL SUPPLY - Google Patents

Description

TURBOGENERATOR FOR NUTRITION

2 gj "JtBet" JAIMSH Mllll-lllll -IIJII

E21 B47 / 00

The proposed device relates to the field of logging during drilling and can be used to autonomously provide energy to downhole devices while moving drilling fluid in drill pipes.

The well-known borehole turbogenerator (paragraph M 15912 RF, MKI E21 B47 / 022, 08.08.2000 publ. 20.11.2000) contains an external rotor with a turbine housing, a stator with a fixed axis and an oil-filled cavity between the rotor and stator, the compensator being in the form of a piston with the possibility of axial movement.

The design does not allow monitoring the condition of the units without completely disassembling the generator and during repair requires dismantling the electrical part of the generator.

Known turbogenerator with a fully isolated generator cavity. The hydraulic part is connected with the generator drain; it is carried out through the rotation transmission unit, which is a magnetic coupling (V.P. Chuprov, A.A. Bikineev. Power equipment of downhole telemetry systems of small diameter with a wireless electromagnetic communication channel. // NTV Logger. Tver: AIS Publishing House, 2000. Issue 73, pp. 100-101).

The magnetic coupling requires additional supports for the rotating part located in the abrasive medium (drilling fluid), and clogging is possible

the gap between the driving and driven parts of the clutch with ferromagnetic particles (for example, scale).

The closest to the claimed device is a turbogenerator unit for autonomous downhole tools (USSR AS No. 1006738, MKI E21 B47 / 00 declared 12.11.1981, publ. 23.03.1983 - nrototin). The unit contains a hydraulic turbine, an oil-filled stator, an oil compensator, a piston lubricator, and sealing devices.

The location of the oil compensator on the stator of the turbine assembly complicates the design, and the presence of a spring-loaded piston in the lubricator reduces reliability, since it is impossible to ensure oil cleanliness in the internal cavity due to wear of the rotating parts required for normal piston operation.

The expected technical result is increased reliability, ease of operation.

The turbogenerator for supplying the downhole equipment comprises a turbine and a rotor located on the hollow drive shaft, a mechanical seal of the drive shaft, a stator located together with the rotor in the oil-filled housing of the turbogenerator, an oil compensator. The oil compensator is made in the form of a rigid casing connected to the casing of the turbogenerator and an elastic element closed on the side of the turbine with a protective cap connected to the casing of the turbogenerator and is located between the rotor and the turbine.

The figure shows a turbogenerator (TG) for powering downhole equipment: 1 - TG body; 2 - a power shaft; 3 - rotor; 4 - stator; 5 - turbine;

6 - mechanical seal; 7 - the cornea of the compensator; 8 - elastic element of the compensator; 9 - a protective cap; 10 - support rotation; 11 - filler neck.

The lower end of the hollow drive shaft 2 is mounted on one of the bearings 10 of rotation in the housing 1 TG. Next, a rotor 3 is mounted on the drive shaft 2, opposite the rotor 3 on the TG case there is a stator 4 fixed by the housing of the compulsor 7. An elastic element 8 is fixed on the compensator body 7, closed by a protective cap 9. The second rotation support 10 for the drive shaft 2 is located in the compensator case 7. At the upper end of the hollow drive shaft 2, closed by a mechanical seal 6, a turbine 5 is mounted. The oil-filled housing 1 of the TG is hydraulically connected along the hollow drive shaft 2 with the internal cavity of the compensator formed by the housing 7 and elastically element 8. In the housing 1 of the TG there is a filler neck 11. External pressure on the elastic element 8 is supplied through special openings in the protective cap 9.

In the process, the TG is fixed in the drill string, electrically connected to the downhole equipment. Under the action of the washing fluid flow, the turbine 5 begins to rotate, transmitting its rotation to the drive shaft 2 and the rotor 3. The rotor 3 generates a rotating magnetic field, causing an electric current in the stator 4. Compensating fluid, poured through the filler neck 11 into the housing 1 of the TG and the internal cavity of the compensator formed by a rigid body 7 and an elastic element 8, unloads the sealing devices of the turbogenerator and the support of rotation 10. The filler neck 11 after filling the liquid is closed with a special stopper. The elastic element 8 acts as a diaphragm, compensating for the pressure drop that occurs during operation between the internal cavity of the TG and the flush flow

liquid, because when a pressure differential arises between the internal cavity of the TG and the external pressure, the working conditions of the rotation supports 10 deteriorate right up to jamming. The protective cap 9 protects the elastic element 8 from abrasive, cavitation and other types of wear.

The proposed design is easy to assemble, during manufacture and operation, is highly reliable due to the tightness of the TG cavity and the unloaded bearings and seals.

Claims (1)

A turbine generator for supplying downhole equipment, comprising a turbine and a rotor located on a hollow drive shaft, an oil compensator, a mechanical seal, a stator placed together with the rotor in an oil-filled turbine generator housing, characterized in that the oil compensator is made in the form of a rigid housing connected to the turbogenerator case , and an elastic element that is closed on the side of the turbine with a protective cap connected to the body of the turbogenerator, and is located between the rotor and the turbine.