Downhole drilling motors

 

(57) Abstract:

The invention relates to the field of drilling equipment, in particular to screw downhole motors for drilling oil and gas wells. The invention consists in that the device for connecting the motor shaft with the reference node contains the intermediate shaft with external helical teeth for interaction with internal helical teeth of the rotor, and surfaces of revolution described relative to the tops of the projections and depressions of the outer helical teeth of the intermediate shaft made barrel. The invention provides increased reliability of operation of the engine when it is used for drilling both vertical and directional and horizontal wells. 1 C.p. f-crystals, 4 Il.

The invention relates to the field of drilling equipment, in particular to screw downhole motors for drilling oil and gas wells, particularly for drilling directional wells.

Known downhole mud motor (see kN. Guzman, M. I., Balenko D. F. , Kochnev, A. M. , Nikonorov S. S. Downhole screw motors for drilling wells. - M.: Nedra, 1981, S. 18, Fig.5) containing a stator with an internal helical teeth, one piece is a device for connecting the rotor shaft with the reference node. The device for connecting the rotor with the shaft supporting unit is designed in the form of a double-joint propeller shaft with gear couplings. As shown, at high loads the torque durability of gear couplings unsatisfactory. In addition, one-piece rotor has a large mass, which leads to high centrifugal forces and an intense transverse vibrations during engine operation.

These drawbacks are partially eliminated in the known screw downhole motor (U.S. patent 4909337, MKI E 21 In 4/02, publ. 20.03.90 g), which contains a stator with an internal helical teeth, placed eccentrically within the stator multiple hollow rotor with a wall of constant thickness, having outer and inner helical teeth, which number is one less than the number of teeth of the stator, the reference node, which includes housing, shaft and bearings, and a device for connecting the rotor with the shaft support unit made in the form of torsion (flexible shaft), placed in the cavity of the rotor. The upper end of the torsion bar is connected with the upper part of the rotor, and the lower is connected to the shaft reference node. The durability of the torsion in this engine is significantly higher compared with the longevity of the double-joint propeller shaft with couplings is

Known engine work satisfactorily when drilling vertical wells, when the engine is performed in a live performance (the stator and the body reference node coaxial). When it comes to drilling directional wells and the engine is curved (between the stator and the housing support unit is curved sub), the device for connecting the rotor with the shaft support unit made in the form of torsion, working poor, because of the increased angle of bending torsion (>1,5o) it loses its longitudinal stability, which leads to breakage of the torsion bar.

The present invention is to remedy these disadvantages, improving the reliability of operation of the engine when it is used for drilling both vertical and directional and horizontal wells.

The problem is solved in that in the known screw downhole motor contains a stator with an internal helical teeth, placed eccentrically within the stator hollow rotor with a wall of constant thickness, having outer and inner helical teeth, which number is one less than the number of teeth of the stator, the control node includes a device for connecting the rotor shaft with the reference node contains the intermediate shaft with external helical teeth for interaction with internal helical teeth of the rotor, and the surface, described in the tops of the projections and depressions of the outer helical teeth of the intermediate shaft made barrel.

Another difference is that in the upper part of the rotor there is a plug installed in the lower part of the rotor placed made from elastic material, is fixed in the rotor and on the outer surface of the intermediate shaft and the inner rotor cavity is filled with grease.

The device for connecting the rotor shaft with the reference node, containing the intermediate shaft with external helical teeth of the barrel-shaped to interact with internal helical teeth of the rotor allows to improve the conditions for the transfer of torque in the engine due to the maximal possible increase in the diameter gear of the intermediate shaft (limited diametral size of the engine) and bring it closer to the rotor diameter. Thus the teeth of the intermediate shaft are of increased height, bending strength and reserve for wear.

Also, the gear portion of the intermediate shaft inside thin-walled rotor allows to improve the conditions for the transfer of centrifugal force on the mass of the precession-moving intermediate VA the St, these forces are transferred through the wall of the rotor directly on the lining of the stator, which acts as a radial bearing for the rotor.

Running surfaces, described in the tops of the projections and depressions of the screw teeth of the intermediate shaft, barrel allows to provide the desired angle of curvature of the engine by adding the angular mobility of the intermediate shaft relative to the rotor and eliminate edge contact of the outer teeth of the intermediate shaft with the internal teeth of the rotor.

Accommodation in the upper part of the rotor stub, and in the lower part of the rotor cuff made of elastic material to seal the cavity in which is placed a spiral teeth of the rotor and the intermediate shaft, and filling the cavity with grease increases the durability of the device for connecting the rotor with the shaft between the reference node and the engine in General.

In Fig. 1 shows a General view of the downhole motor in longitudinal section;

in Fig. 2 shows in enlarged scale the node of the rotor and stator from the inside of a rotor of the intermediate shaft;

in Fig.3 shows a cross section along a-a in place of the intermediate shaft in the rotor;

in Fig. 4 shows a portion of PROMEC (Fig.1-3) includes a stator 1 with internal helical teeth 2, made of elastic material such as rubber. Inside the stator 1 is placed a hollow thin-walled rotor 3 with a wall of constant thickness, having external helical teeth 4 and the internal helical teeth 5. Number of teeth Z1the rotor 3 is one less than the number of teeth Z2stator 1, and the axis O1O1the rotor 3 is offset relative to the axis O2O2the stator 1 by the amount of eccentricity E equal to half the height H of the teeth.

The engine includes a support node 6, including building 7, shaft 8, the axial bearing 9 and the radial bearing 10, and the device 11 for connection of the rotor 3 with the shaft 8 the reference node 6, which includes the intermediate shaft 12, which in the upper part has external helical teeth 13 to communicate with internal helical teeth 5 of the rotor 3. The lower end of the intermediate shaft 12 is connected with the shaft 8, for example, by means of a swivel coupling 14.

Between the stator 1 and the housing 7 reference node 6 has a sub 15, which may be made straight or curved (if a downhole mud motor is used in the case of oblique directional drilling as a diversion).

External helical teeth 13 of the intermediate shaft 12 (Fig.4) made barrel, i.e. the room.

In the upper part of the rotor 3 with the cover 18 (Fig.2) fixed to the rotor 3, for example, by welding, and in the lower part of the rotor 3 is placed the sleeve 19 of elastic material, for example rubber. One end of the cuff 19 is fixed inside the rotor 3 between the disk 20 and washer 21 by means of a spring ring 22. The second end of the cuff 19 is fixed on the outer surface of the intermediate shaft 12 by a clamp 23. Between the cover 18 and the upper face of the intermediate shaft 12 posted by spacer 24 and the heel 25. The internal cavity 26 of the rotor 3 is filled with grease.

In the upper part of the stator 1 has a sub 27 with threads 28 for attaching the engine to the string of drill pipes (the column of drill pipe of Fig. not shown). The lower end of the shaft 8 is threaded 29 to attach the rock cutting tool (Fig. not shown).

A downhole mud motor operates as follows. When applying a liquid from the surface through the string of drill pipe, the rotor 3 rotates inside the stator 1, objetivas its outer helical teeth 4 on the internal helical teeth 2 of the stator 1, and performs the planetary motion, the axis1O1the rotor 3 is rotated around the axis O2ABOUT2stator 1 proto. The rotation of the rotor 3 is transmitted to the shaft 8 the reference node 6 through the intermediate shaft 12 of the device 11 due to the interaction of internal helical teeth 5 of the rotor 3 with external helical teeth 13 of the intermediate shaft 12, which makes the angular precession movement. The possibility of angular displacement of the intermediate shaft 12 within the rotor 3 is provided by a barrel-shaped form of external helical teeth 13. Hydraulic axial load acting on the rotor 3, is transmitted through the cover 18, the spacer 24 and the heel 25 on the upper end of the intermediate shaft 12 and then through the hinge coupling 14 on the shaft 8 between the reference node 6.

When the engine is on the lower part of the rotor 3 of centrifugal force from the precession of the moving intermediate shaft 12 and the radial component of the total axial load occurring due to the skew of the intermediate shaft 12. Since the outer helical teeth 13 of the intermediate shaft 12 is placed in the cavity 26 of the rotor 3, the transfer of these forces occurs through the wall of the rotor 3, a support to which are internal teeth 2 of the stator 1 and the rotor 3 is unloaded from bending loads.

Since the internal cavity 26 of the rotor 3 is filled with grease, the teeth 13 of the intermediate shaft 12 when PR is m heat when a large volume of oil bath.

1. A downhole mud motor contains a stator with an internal helical teeth, placed eccentrically within the stator hollow rotor with a wall of constant thickness, having outer and inner helical teeth, which number is one less than the number of teeth of the stator, the reference node, which includes housing, shaft and bearings, and a device for connection of the rotor shaft with the reference node, characterized in that the device for connecting the rotor shaft with the reference node contains the intermediate shaft with external helical teeth for interaction with internal helical teeth of the rotor and the surface of rotation, described relative to the tops of the projections and depressions of the outer helical teeth of the intermediate shaft made barrel.

2. Downhole drilling motors under item 1, characterized in that the upper part of the rotor there is a plug installed in the lower part of the rotor placed made from elastic material, is fixed in the rotor and on the outer surface of the intermediate shaft and the inner rotor cavity is filled with grease.

 

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