The spindle stabilizer

 

(57) Abstract:

The invention relates to the field of technical equipment for drilling oil and gas wells, and in particular to a hydraulic downhole motors. The spindle stabilizer hydraulic downhole motor includes made in the form of a container body connected with the housing upper and lower thick-walled subs, on the outer surface of which is made of blades and the inner surface through the upper and lower radial bearings rely on the hollow shaft, and the spindle stabilizer is accommodated in the housing container support the heel and stator elements of the upper and lower radial bearings placed in the upper and lower thick-walled subs, their axial and radial fixation in these subs together with hard-regulation and reduction bushings supporting the heel through Cabinet nuts, that clamps the pivot bearings and the spacer rings of the supporting heel. The invention improves the efficiency of drilling directional wells due to the stabilization of the housing of the spindle. 1 Il.

The present invention relates to the field of technical means by which drilled netomat the rotation of the drill bits, destroying the bottom of deep wells.

All downhole motors are axial bearing, perceiving the hydraulic load on the motor rotor and the reaction from the axial load on the bit. This bearing is made in a special, quick change drilling, site-spindle (see Downhole motors and spare parts. Directory, M.: Nedra, 1980).

Distant analogue of our invention is the spindle podatkowy (see Fig. 26, S. 79 above).

However, the design of this spindle does not perform to its relatively thin body and short subs (the nipple and coupling) is sufficiently long and wide in the radial direction of the blade, through which the axis of the spindle shaft and attached to its lower end to stabilize the bit in the annular space relative to the axis of the drilled wells. Attempts to weld the blade to thin-walled housing is not only deform it, but also significantly reduce the area of the annular gap between the housing and the borehole wall, which, on the one hand, reduces trouble-free service life of the spindle, and on the other, leads to the rapid destruction of the walls of the drilling wells.

The closest analogue of the invention the stone surface which has blades, thus the inner surface of the sub has a radial bearing, which is supported on the hollow shaft of the spindle and accordingly sets its axis along the axis of the thick-walled sub (see RF Patent 2047721, bull. 32, from 10.11.95).

But when this version of the blade to limit reduce the area of the annular cross section of the wellbore and accordingly increase the speed of the upward flow of the drilling fluid. In this case, is meaningless the idea of stabilizing the longitudinal axis of the spindle in the barrel drilled wells, because, on the one hand, begin to rapidly collapse the walls of the well with which the contact blades, on the other hand, to the limit is reduced longitudinal axis of the base support centration distance from the rock surface of the bit to the point of contact of the blades with the borehole wall.

Our invention allows to stabilize the spindle body in the trunk of drilled wells with long and wide (in radial direction) blade: straight or spirally twisted, while not reducing radial axial dimensions of the supporting feet and not increasing the speed of the upward flow of the drilling fluid in the wellbore in places where the blades of Kontraktovaya hydraulic downhole motors with spindle-stabilizers, performed in accordance with our invention. These areas include: drilling a strictly vertical sections boreholes; drilling directional rectilinear sections of directional wells.

Due to the effective stabilization of the housing of the spindle, and consequently the shaft and drill bit in the wellbore drilled wells, increasing performance bits and increased trouble-free service life of the axial leg-heel spindle is the most rapidly wear node of hydraulic downhole motors.

The essence of our invention is to provide spindle-stabilizer, the body of which is made in the form of the container that its lower end is associated with thick-walled sub, on the outer surface of which has the blades and through which the lower radial bearing its inner surface rests on the hollow spindle shaft; the upper end of the housing of the container is connected with the upper thick-walled sub, on the outer surface of which there are also blades, with the upper radial bearing its inner surface rests on the hollow shaft of the spindle. Support the heel of the spindle stabilizer is housed in the housing container. Internal fit gianera, and the diameter on which are placed the base of the blades thick-walled subs, 10...80 mm less than the outer diameter of the container. The stator elements of the upper and lower radial bearings is placed in the upper and lower thick-walled subs; their axial and radial fixation with angular adjustment and reduction bushings supporting the heel through Cabinet nut that clamps between the inner thrust end face of the upper thick-walled sub and its internal thrust end face of the thrust bearings and spacer ring bearing-heels, accommodated in the housing container.

On the hollow shaft of the spindle-stabilizer using gaici-coupling clamped (with emphasis in the lower outer end of the shaft) of the rotor sleeve radial bearings, spacer bushings, discs heel and spacer ring disks, angular adjustment of the shaft sleeve.

The invention is illustrated in the drawing, which shows a General layout of the spindle Assembly-stabilizer.

To the body of the container 1 spindle on the bottom of the thread is fastened a thick-walled sub 2, top - heavy wall sub 3, through which the spindle is attached to the housing of the working section of hydraulic downhole motor (less than the overall diameter of the drill bit (not shown), mounted on the lower threaded end of the hollow shaft 5 of the spindle of the turbodrill. Diameter, on which is placed the base of the blades 4 subs 2 and 3, is always less than the outer diameter of the housing container 1 for a value of 10 to 80 mm

This diameter is selected so that, depending on the number of blades, their width, the angle of inclination to a plane perpendicular to the axis of the shaft 5, and their outer overall diameter, square megapastor section would be 10-20% greater than the cross-sectional area formed by the nominal diameter of the bit, its a well bore, and the outer diameter of the container 1.

Internal fit (mounting) diameter subs 2 and 3 always on 10-40 mm less than the internal fit (mounting) of the diameter of the container 1.

On the inner thrust end face of the upper thick-walled sub 3 rest: top hard-adjusting sleeve 6, the stator elements 7 two to four upper radial bearings, the transition sleeve 8, the thrust bearings 9 and the spacer ring 10, the stator elements 7 two to four lower radial bearings, the lower angular adjustment sleeve 11.

This stator elements 7 of the upper and lower radial bearings soybeans upper thick-walled sub 3 and the lower thick-walled sub 2.

The thrust bearings 9 and spacer rings 10 are fixed in the radial direction in the landing (mounting) the diameter of the inner surface of the housing container 1.

The axial compressing force, with which the axial and radial stiffness above mentioned structural elements, in thick-walled subs 2 and 3 and in the housing container 1 is achieved by tightening big torque, with failure of the inner end of the Cabinet nut 12.

On the hollow shaft 5 by a nut-clutch 13 fixed rotary sleeve 14 of the upper and lower radial bearings, discs 15 and spacer rings 16, spacer spacer sleeves 17, the angular adjustment of the sleeve 18 of the shaft 5.

The radial centering of the shaft 5 relative to the mounting surfaces of the inner cylinder subs 2 and 3 due to a hard landing tolerances rotary bushing 14 to the shaft 5 and stator elements 7 radial bearings relative to the Seating surfaces of the inner cylinder subs 2 and 3.

The disks 15 and the spacer ring 16, the thrust bearings 9 and the spacer ring 10, and the upper angular adjustment sleeve 6 is fixed only settling the SPINDLE STABILIZER

Directly on the rig to the lower threaded end of the hollow shaft 5 of the spindle-stabilizer attached drill bit; in this case, the spindle is supported on the weight of the drilling system drilling rig above the rotary table using the Elevator, exciting body container 1 spindle under the blades 4 of the upper thick-walled sub 3.

Then to the sub 3 secures the working section of hydraulic downhole motor (turbine or screw).

The sequential increase the drill pipe string all drilling layout is brought as close as possible to the bottom of the borehole. Included in the work of the mud pumps, and begins the process rassilki old trunk, and then further deepening of the borehole bottom.

At the same time (in contrast to the existing practice of downhole drilling motors) centering bit and stabilization in the wellbore axis of the spindle shaft is carried out without an abrupt increase of speed of the upward flow of drilling fluid along the blade subs-stabilizers. This wide and long blades of thick-walled subs not only to the possible minimum limit lateral and angular displacement of the shaft axis in a bit, but the o in groundwater fluctuations of the center of gravity of the bit and unbalanced torque, implemented on the surface of its rock elements. Such a design of spindle-stabilizer-tokage severely limits the jet angle of twist drill pipe, which greatly facilitates the sight of tool for directional drilling in almost completely eliminates the "twist" bump-hole layout in the drilling process.

The result is not only a precision directional drilling, but also the growth performance bits.

The spindle stabilizer comprising a housing associated with the housing of the lower thick-walled sub, on the outer surface of which has the blades and the inner surface through the lower radial bearing rests on the hollow shaft of the spindle-stabilizer, characterized in that it has associated with the case, which is made in the form of a container mounted on the shaft through the upper radial bearing upper thick-walled sub, on the outer surface of which is made of the blade, the spindle stabilizer has the support of the heel, which is housed in the housing container, and internal fit, the diameters of the upper and lower thick-walled subs on 10-40 mm less than the internal d subs, on 10-80 mm less than the outer diameter of the container, with the stator elements of the upper and lower radial bearings placed in the upper and lower thick-walled subs, their axial and radial fixation in these subs together with hard-regulating sleeves and reduction bushings supporting the heel through Cabinet nut that clamps between the inner thrust end face of the upper thick-walled sub and its internal thrust end face of the thrust bearings and spacer ring bearing-heels, accommodated in the housing container.

 

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