Borehole instrument feeding generator

FIELD: electromechanical engineering.

SUBSTANCE: proposed generator primarily designed to supply with power borehole instrument of face telemetering system in the course of boring has internal stator and rotor; the latter mounts turbine in its front part that has casing carrying rectangular- or trapezoidal-section helical blades. These blades are free to vary their angle of lift depending on conditions of borehole washing with drilling fluid. Blades may be made of flexible material and have two parts of which one part is joined with turbine casing and other (loose) part is free to bend in transverse plane. In addition, blades may have variable stiffness in cross-sectional area and variable height of cross-section profile; loose parts of blades may be joined with ring. Blade turn limiter responding to maximal discharge of drilling fluid may be provided on the turbine casing.

EFFECT: enhanced operating reliability and extended variation range of drilling fluid discharge through generator turbine.

7 cl, 2 dwg

 

The invention relates to the field of electrical engineering and applicable mainly in the design of generators to power the downhole tool downhole telemetry system.

Known electric machine AS the USSR №1297183, IPC 4 H 02 To 21/12 containing the outer rotor with permanent magnets and the inner stator with elektroobmotka. This air-cooled engine is inefficient system of lubrication of the bearings.

Known electric machine according to the patent of Russian Federation №2061992, IPC 6 H 02 To 15/00 containing the rotor, stator, bearings and sealing device. The cavity between the stator and the rotor are filled with lubricating fluid. A flexible diaphragm installed in a vessel filled with lubricating fluid and communicating with the oil-filled cavity, acts as a compensator changes of pressure and temperature.

The disadvantage of this electric car is that it is adapted to work in a natural environment at atmospheric pressure and a low range of temperatures. For example, the electric machine is not operable at ambient pressure of hundreds of atmospheres, especially if the liquid contains abrasive particles. The liquid containing abrasive particles, can penetrate into the cavity of the bearings, which will lead to their rapid deterioration.

<> Known generator to power the downhole tool downhole telemetry system according to U.S. Pat. The Russian Federation for invention №2173925 (prototype). This generator has an internal stator and the rotor with turbine conical installed in its front part and having a casing and vanes are mounted at an angle to the axis of the turbine.

The objective of the invention is to improve the reliability of device operation with a large range of changes in the flow of mud.

These tasks are achieved due to the fact that a generator to power a downhole tool that includes an internal stator and a rotor with one or more turbines, each of which has a housing and installed blades spiral shape with a rectangular or trapezoidal cross-sectional profile has a blade made with the possibility of changing the elevation angle of the blades depending on the mode wash well drilling mud. The blades are made of elastic material. The blades are made of two parts, one of which is rigidly connected to the turbine housing, and other spare part has the capability of bending in the transverse plane. The blades have a variable stiffness of the cross-section. The blades are made with the changing height of the cross-sectional profile. The free ends of the blades are connected with the ring. In the case of the s performed the rotation limiter blades.

The proposed solution has novelty, industrial applicability and inventive step. Novelty is confirmed by the patent research. Inventive step is confirmed by the fact that the interaction between all of the essential features allowed us to obtain a new effect: stable rotational speed of the generator in a wide range of flush fluid flow.

The invention is illustrated in figures 1 and 2, where:

figure 1 shows a drawing of the generator with a variable angle of elevation of the turbine,

figure 2 shows a drawing of the generator with the ring.

The generator (figure 1) contains an internal stator 1, the outer rotor 2, in front of which is set turbine 3 made in the form of a housing 4 with the blades 5, is made at an angle to the axis of the turbine 3. The blades 5 are composed of two parts: fixed 6 and 7 free. Both parts 6 and 7 are executed at the same time. Fixed part 6 of each blade 5 is rigidly connected to the housing 4, and the other free, not attached or connected to the ring 8 (figure 2)mounted on the body 4 with the possibility of free rotation. In the outer rotor 2 can be installed limiter 9.

When the generator is installed as part of the layout of the drill pipe, through the turbine 3 is held drilling mud. With increasing flow rate and pressure of the Boers the solution part of the blades 5 are bent in the transverse plane, increasing the flow area between the vanes. As a result, the generator operates in a stable mode in a wide range of costs of drilling mud. The limiter 9 limits the turn angle of the blades at the maximum washing regime borehole mud.

The use of the invention made possible to stabilize the operation of the generator in a wide range of flow rate of the drilling fluid that is necessary for the safe operation of the downhole tool. The changing profile of the blade 5 when the change in the flow rate of the drilling fluid prevents spinning of the generator to full speed and excessive increase in voltage at its output terminals.

1. Generator to power the downhole tool containing the inner stator and the rotor with one or more turbines, each of which has a housing and installed blades spiral shape with a rectangular or trapezoidal cross-sectional profile, wherein the blades are made with the possibility of changing the elevation angle of the blades depending on the mode wash well drilling mud.

2. The generator according to claim 1, characterized in that the blades are made of elastic material.

3. The generator according to claim 2, characterized in that the blades are made of two parts, one of which is rigidly connected to the turbine housing, and other spare part is in the possibility of bending in the transverse plane.

4. The generator according to claim 3, characterized in that the blades have a variable stiffness of the cross section.

5. The generator according to claim 3 or 4, characterized in that the blades are made with the changing height of the cross-sectional profile.

6. The generator according to claim 5, characterized in that the free part of the blades are connected with the ring.

7. The generator according to claim 6, characterized in that the turbine housing is made limiter rotation of the blades.



 

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