The downhole motor spindle

 

(57) Abstract:

The invention relates to equipment for drilling, and in particular to actuators for rotary drilling, placed in the well. The invention consists in that the elastic element is placed inside the device, installed between the radial bearings and is made in the form of two groups of spring rings, each of which contains an inner ring mounted on a shaft and the outer ring is fixed in the housing, and the rings are arranged with a gap between them and the axial bearing is located between the two groups of spring rings and annular channel providing a flow of lubricating fluid between the two groups of spring rings. The invention provides for the reduction of dynamic loads on the spindle, a significant suppression of vibrations and, consequently, increase the service life of the spindle. 1 C.p. f-crystals, 1 Il.

The invention relates to equipment for drilling, and in particular to actuators for rotary drilling, placed in the well.

In operation, the spindle is experiencing significant dynamic loads due to surface irregularities of the borehole walls, the ripple washing liquid, uneven with martisius device.

A device for preventing mechanical wear downhole motor, made in the form mounted in the housing and on the shaft of the turbo-drill bushings and retainer, while the sleeves have radial grooves that are offset relative to each other in height by the amount of permissible backlash exhaust turbo-drill, and the latch is made in the form of a spring-loaded ball placed in the radial groove of one of the bushings (and.with. The USSR 933923, E 21 In 4/02, 07.06.82 year ).

The disadvantage of this device is heavy wear grooves and surfaces interacting with balls, which significantly reduces the service life of the spindle.

Known damper spindle turbo-drill, comprising a housing with an internal helical surface, a shaft with an outer screw surface and placed between the elastic element. The latter is in the form of a closed elastic shells spiral shape. Hollow shells filled with a viscous fluid and communicate among themselves by means of the throttle node accommodated in the housing. On the shaft and in case there is a stub limiting axial displacement of the elastic element.with. The USSR 1659619, E 21 In 4/00, 30.06.1991 year).

This device is of considerable length, which increases the por what causes low operational reliability, because if the size of the hole it is impossible to ensure a sufficient thickness and strength of the walls of the elastic element.

For the prototype accepted spindle, comprising a casing placed inside the shaft, the axial and radial bearings, the elastic element. The upper radial bearing consists of a sleeve mounted on the shaft, and a sleeve fixed in the housing. Between the sleeves is placed an elastic cylindrical element of the wear-resistant material with a low coefficient of friction. In the elastic element vulcanized compression spring. Elastic element in the upper part rests on the disk mounted in the housing, and at the bottom of the disk mounted on the shaft. Similar elastic element is located in the lower radial bearing, and in the upper part of the elastic element rests on the disk mounted on the shaft, and at the bottom of the disk mounted in the housing (RF patent 2011776, E 21 In 4/00, 30.03.1994,).

The disadvantage of the prototype is that the perceiver axial force of the elastic element made in the form of a cylinder placed between the two sleeves and resting on the ends to disks, deprived of the opportunity to change its geometrical dimensions during elastic deformation in the process of damping the shock naeto provided between the axial bearing. Elastic element, which is a metal spring in the rubber, being reduced in length to some extent will changes in diameters, which can lead to jamming of the radial bearing or abnormal wear rubber parts as a result of the rubber extrusion through the annular clearances between the support disks and the housing, and the shaft.

Task to be solved by the claimed invention is directed, is to increase the service life of the spindle.

The technical result from the use of this invention is a significant vibration reduction and, consequently, reducing the dynamic loads on the spindle.

The technical result is achieved due to the fact that in the spindle hole of the engine, which includes a housing, shaft, axial and radial bearings mounted between the elastic element, the latter is in the form of two groups of spring rings, each of which contains an inner ring mounted on a shaft and the outer ring is fixed in the housing, and the axial bearing is located between these groups. Internal and external snap rings elastic element is made of the same stiffness. In the axial bearing is made annular channels connecting between the both groups of the other items on 55-60% of the total precipitation during Assembly of the spindle.

The drawing shows a General view of the proposed spindle in the section.

The spindle includes a housing 1, the hollow shaft 2, top 3 and bottom 4 radial bearing located between the elastic element consisting of two groups of spring rings, the inner ring 5 is installed on the shaft 2 and the outer ring 6 in the housing 1. Between them is placed multi-row ball axial bearing 7, in which the annular channels 8, connecting the two groups of rings of an elastic element. The outer diameter of the ring 5 is smaller than the inside diameter of the ring 6 to form between them a guaranteed backlash and spring ring are made of the same stiffness. In the housing 1 provided with channels 9 and 10 for pumping lubricating fluid. In addition, the spindle is provided with a seal assemblies 11 and 12, which consist of two sealing and wiper rubber elements and sealing elements facing in different directions and separated by a ring that prevents the "wrapping" their skirts.

The spindle works as follows. When assembling it to create the preload of the elastic element, 10-15% greater than the axial thrust on the spindle. When this sludge spring rings 5 and 6 is 55-60% of the total. The annular cavity IU through radial bearings 3 and 4, the inner 5 and outer 6 rings elastic element and the axial bearing 7 are transmitted to significant dynamic loads. The presence of gaps between the spring rings 5 and 6, the elastic element and the annular channels in the axial bearing 7 provides braking lubricating fluid when flowing between the two groups of rings of an elastic element that provides additional damping of vibrations from the drilling tool.

The technical effect of the proposed use of the spindle is achieved by implementation of an elastic element of the compound, resulting in the nodes bearing axial bearing podpruzhinivajushchaja on both sides with the same force that causes a significant suppression of the vibration caused by the running of teeth of the bit on the bottom, from the irregularities of the borehole walls, uneven feed rate of the drilling tool and the pulsation of the drilling fluid acting on the spindle.

Pre-compression of the elastic element provides uniform distribution of load along the lines of the axial bearing.

Sludge spring rings of the elastic element eliminates the separation of the elements of the axial bearing, shocks about the ledges on the walls during descent downhole number is the situation of vibrograf, the possible suppression of self-oscillations transmitted by the drill pipes. In addition, the advantages of the claimed invention are effective in extinguishing vibrograf, the possible suppression of self-oscillations transmitted by the drill pipes. In addition, there is a possibility of reducing the length of the spindle by reducing the number of rows of bearing of the engine.

These advantages lead to the increase of the service life of the spindle and increased drilling speed.

1. The spindle hole of the engine including a casing, is placed inside the shaft, the axial and radial bearings, the elastic element, wherein the elastic element is installed between the radial bearings and is made in the form of two groups of spring rings, each of which contains an inner ring mounted on a shaft and the outer ring is fixed in the housing, and the rings are arranged with a gap between them and the axial bearing is located between the two groups of spring rings and annular channel providing a flow of lubricating fluid between the two groups of spring rings.

2. The spindle under item 1, characterized in that the inner and outer rings of the elastic element have the same jesd the

 

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