The mud motor-reducer

 

(57) Abstract:

The invention relates to the field of mining, in particular to means for drilling oil and gas wells, and particularly to a downhole drilling motors. The mud motor-reducer that contains three independent, made with the possibility of bonding between a section at the bottom of the spindle, the middle gear and the upper turbine, is designed so that the driving and driven shafts of the reducer section is fixed in the radial and axial position in having the lights trim the chassis using a rotary elements of the radial bearings and angular contact bearings, recorded in turn in the housing of the reducer section defnitely sub, and the drive shaft has a nut-carrier, an eccentric axle which is fixed internal gear, which is connected with the driven shaft with Cam clutch Oldham, and the spindle shaft seal section made throttle, with the stator elements throttle shaft seal spindle, a stator cage heel and the spacer ring is fixed in the housing, the spindle section by threaded nuts, and on the shaft of the spindle by a nut-coupling fixed is ROFILE blades stator pressure turbine turbine section has a direction-left screw, and the chord of the blades of the rotor speed in the direction of the right screw. The invention provides improved efficiency and durability of the usage of the mud motor-reducer. 3 C.p. f-crystals, 6 ill.

The invention relates to means by which drilled oil and gas wells; in a narrower division of these funds to downhole motors - turbodrills, which provides the rotation of the roller bit, destroying the faces of barrels of drilling wells.

Distant analogue of our invention is the turbodrill, manufactured and used in the USSR from 1924 to 1934 under the patent 546; author M. A. Kapelyushnikov; priority from 19.02.22,

However, all the main nodes of the turbodrill: turbine, gearbox, axle bearing - had a very low life (less than 20 hours), were mounted in a single housing that is not allowed to conduct their impersonal-specialized repair and replacement. Because of its low efficiency it was discontinued.

The closest analogue of our invention is "Geared turbo-drill", performed according to the description of the patent of the Russian Federation 2.112 856, bull. 16 from 10.06.98,

This gear turbodrill has Turia and the spindle. The input and output shafts of the gearbox are interconnected planetary gear Barrett, with the turbine housing section, the housing and the spindle body are rigidly connected with each other by threads; all elements of the reduction gear Barrett and supporting elements of the spindle are arranged in a common oil-filled chamber.

In our opinion, the main drawback of such gear turbodrill is the scheme, involving the use of planetary gear Barrett placed in one chamber with the base elements of the spindle. The fact that the feet of the satellites of the weakest power level of this scheme, and the supporting elements of the spindle can work several times longer (but must be replaced together). Moreover, single-stage scheme of the planetary gear reducer Barrett can provide a coefficient of reduction of speed of up to 3.75, while for the realization of all potential gear turbodrill this ratio should fall within the range of values from 7 to 10.

The invention allows to solve all the problems of creating a durable and relatively inexpensive short gear turbodrill due to the increase of predatohm wheels, bringing it to the values in the 8-10, and use only 15-40 pressure stages of the turbine. This turbine will be implemented relatively small pressure differential, which allows to increase the efficiency of jetting roller bits.

The invention consists in the creation of the mud motor-reducer that includes three independent fastened to each other through hull threads (directly on the rotary table of the drilling rig) section: lower spindle, the housing is installed in the stator elements of the seal of the spindle shaft, the stator of the ball cage heel and the spacer ring; a shaft section with a screw-coupling fixed rotary elements of the seal and the rotary elements of the ball cage heel and spacer rings.

Next - average - gear section, in which case using dvuhnitochnogo of the sub apixaban false case in which the possibility of mutual rotation has two shaft - master and slave. Drive shaft to the eccentric pin rotatably in relation to fixed internal gear wheel located in a one-sided engagement with the large gear to the second clutch Oldham, which transmits the rotation of the internal gear wheel on the driven shaft, is also provided with a Cam clutch.

Next - top - turbine section in his case is fixed with dvuhnitochnogo of the sub stator pressure stage of the turbine, the stator elements of the radial bearings, the stator cage heel and the spacer ring, and the shaft of the turbine section through a nut fixed rotary elements of the radial bearings, rotary pressure stage turbine rotor shroud axial abutment and spacer rings. Thus the chord of the blades of the stator pressure stages of the turbine is the direction of the left screw and the chord of the blades of the rotary pressure turbine has the right screw.

The invention is illustrated by drawings.

In Fig.1 shows the General layout of the top - turbine section.

In Fig.2 - design of stator pressure stage of the turbine.

In Fig. 3 - design of rotary pressure stage of the turbine.

In Fig.4 - General layout of the upper half of the middle gear section.

In Fig. 5 - the General layout of the lower half of the middle gear section.

awesime elements of sections, joined by hull threads in a single mechanism-the unit is able to rotate the bit directly on the rotary table of the drilling rig.

The design and the specifics of manufacturing parts and components of each section provide for their production at various plants: common elements of all three sections can be their body; angular adjustment and spacer sleeve; nipple subs; radial bearing.

Case 1 top - turbine section to its upper threaded end attached to the lower pipe of the drill string (Fig.1 is not shown).

In case 1, using dvuhnitochnogo connecting sub 2 compressed with a large axial force and fixed: hard-adjusting sleeve 3; angular adjustment ring 4; a stator elements 5 two-five radial bearings; "lights" 6 axial abutment; from one to twelve stator casing 7 of the axial abutment; a spacer ring 8 clips 7; a stator pressure turbine 9. The lights have 6 holes 10, hydraulically indicating the amount of space inside the housing 1 in which are placed the stator pressure turbine 9, with the space located between the inner surface of the housing 1 the spacer rings 8.

On the shaft 11 of the upper turbine section through the nut 12 is compressed and fixed rotary elements of the sleeve 13 between two and five radial bearings; from two to thirteen rotary casing 14 of the axial abutment and spacer rings 15; emphasis 16 of the shaft 11 and the rotary pressure turbine 17. On the shaft 11 with a thread attached slotted (square or hexagonal) coupling 18. Stator pressure stage 9 turbines have blades 19, chord 20 profile which forms with a plane perpendicular to the axis of the degrees, the acute angle . When this chord 20 of the profile of the blades 19 is the direction of the "left" of the screw.

Rotary pressure stage 17 turbines have blades 21, chord 22 profile which forms with a plane perpendicular to the longitudinal axis of the stage, the acute angle . When this chord 22 has a direction "right" screws.

In the housing 23 average - gear section with dvuhnitochnogo sub 2 compressed with a large axial force and fixed: hard-adjusting sleeve 3; angular adjustment ring 4; a stator elements 5 two to four radial bearings; lights with 24 fixed therein with the possibility of axial movement, but without the possibility of rotation, the stator elements 25 of the mechanical seal is about-thrust bearings and a toothed wheel 27 internal gears. Holes 10 of the lamps 24 are hydraulically report top internal cavity 28 with the annular space located inside the housing 23 and the outer side of the trim body 33. Internal cavity 29, which is located under the lower lantern 24, through the window 10 is hydraulically connected with the annular cavity of the trim housing 33.

Each stator element 25 of the mechanical seal fixed in the lamp 24 has a rubber seal 31 and four to eight springs 32, which provides the possibility of axial movement of the stator element 25. The working surface of the stator element 25 has a mechanical cladding 34 wear relevage alloy.

In the housing 23 with the stator elements 26 angular contact bearings are fixed in the axial and radial directions with the possibility of rotation of the two shafts: the leading 35 and the slave 36. Drive shaft 35 has a through-hole drilling 37. To the upper part of the shaft 35 and the screw is fastened oil lubricator 38, which has a movable piston separator 39. To the upper part of the lubricator 38 and the screw is fastened spline (square or hexagonal) coupling 40 having a through-hole drilling 41, hydraulically connecting nadmuchowe space with newportnews cavity of LaBrie 13 one or two radial bearings: spacer sleeve 43; rotary disk 44 of the stator element 25 of the mechanical seal; rotary elements 45 one or two angular contact bearings.

Nut-pinion carrier 42 has a bearing trunnion 46, the axis of which is eccentric offset of 5-25 mm relative to the longitudinal axis of the shaft. The pin 46 has a through-hole drilling 47, which is hydraulically reports through the drilling shaft 37 35 podporchennuyu cavity reservoir 38 with the space outside of the axle 46 and the nut carrier 42.

On the eccentric pin 46 with angular contact bearings 48 is fixed for rotation of the internal gear wheel 49, which is located in unilateral internal meshing with a large gear wheel 27, fixed to the trim housing 33. Internal gear 49 at its bottom end has performed with them as a whole (from a single forged billet) Cam coupling half of Oldham 50, which allows the transfer of torque with guaranteed misalignment of the two rotating shafts.

On the driven shaft 36 by a nut-coupling of Oldham 51 is compressed and fixed: rotary elements of the sleeve 13 one or two radial bearings; a rotor elements 45 one or two angular contact, podsobnogo shaft 36 and the screw is fastened spline (square or hexagonal) clutch 52. The shaft 36 has a through-hole drilling 53. The sleeve 52 has a through-hole drilling 54 in the lower end of which is mounted the discharge valve 55. The valve 55 through drilling 54 in the sleeve 52, through drilling 53 in the shaft 36 and through the drilling 37 in the shaft 35 hydraulically connected to podpornoy cavity lubricator 38.

In the housing 56 of the spindle (lower bearing section of the mud motor-reducer with threaded nut 57 is compressed with a large axial force and fixed: hard-adjusting sleeve 3; a set of rubber on the axial inner surface of the steel bushings 58 total length of 1.5-2 m, which on the one hand represent an artificial stator slotted throttle sealing the hollow shaft 59 of the spindle, on the other hand they represent the stator element of the long radial shaft bearing 59; from one to fifteen stator casing 60 ball abutment of the spindle and a stator spacer ring 61.

On the shaft 59 through slotted (square or hex) nut clutch 62 are attached: a set of case-hardened on its outer surface and hardened to a hardness 57-62 HRC steel bushings 63, which are inlaid rotor slotted throttle shaft seals 59 and simultaneously the rotary element radial the existence from the usual radial bearings of the spindles, which are on the inner surface of the stator bushing relatively thin layer prevulcanized rubber, the thickness of which does not exceed 6% of the diameter of the shaft centered, though on its internal surface has from four to twenty flushing grooves, and a large guaranteed landing clearance on the corresponding stator sleeve from 0.3 to 0.7 mm, the sleeve 58 of the spindle are different.

On the inner surface of the rubber plates no flushing grooves, the thickness of the layer prevulcanized rubber is within the range from 10 to 20% of the diameter of the centered shaft (depending on the Diametric dimension of trubber).

This thick rubber lining allows you to put the stator sleeve 58 on the respective rotary sleeve 63 with tightness of up to 0.1 mm and a clearance of not more than 0.1 mm

When assembled in the shop the spindle shaft 59 can be rotated only attaching torque of 1000 Nm.

However, when testing a turbodrill for drilling when the pressure drop in the nozzles bits 3-7 MPa loss of torque in the aperture of the throttle seal virtually absent, and leakage of the solution through Rossellini reported to the internal cavity of the shaft 59 with the space outside the shaft 59 and the nut clutch 62.

Using hard-adjusting sleeve 3 "standing" face nut clutch 62 relative to the upper hard casing 56 is adjusted so that when mounting the housing 56 of the spindle to the housing 23 average - gear section of the axial load on the shaft 59 of the spindle were not transferred to the rotary elements 45 angular contact bearing middle gear section.

The operation of the mud motor-reducer

Three sections of the mud motor-reducer: top - turbine, the middle gear, the lower the spindle, each of which typically has a length of about 3.5 m, simultaneously or separately from each other are delivered on-Board machine for drilling.

The turbodrill Assembly into a single unit begins on a rotary table of the drilling rig. To the shaft 59 of the spindle, held on the rotary table using the hoist and transport corps of the sub, secure the bit. After that, the spindle partially falls under the rotor and the top of the housing 56 is fixed in Klenova capture the rotary table. Transport sub unsnaps from the housing 56 of the spindle and is fixed on the housing 23 lying on the jetty drilling medium - gear section. Silo t is m and is attached to its defnitely sub 2 to the housing 56 of the spindle. When this occurs a sliding closure coupling gear 52 section and the nut clutch 62 of the spindle.

Before securing the gear section on the housing 56 of the spindle should (if it was not done in the turbine shop or if it was made more than 10 days ago) through the valve 55 of the coupling 52 to pump in the internal system of the reducer section and podporchennuyu cavity lubricator 38 oil cylinder 38 or 52.

The above-described manner to the housing 23 of the reducer section is attached nipple sub 2 of the housing 1 of the upper turbine section. When this occurs a sliding closure couplings 18 and 40.

On the housing 1 is fixed to the first (lower) pipe, or the candle of the drill string, and begins the descent of the whole Assembly of the boring tool in the wellbore.

During the descent of the drill string tool through jetting nozzles of the drill bit, the inner cavity of the shaft 59 of the spindle, through the window 66 of the nut-clutch 62, through the window 10 lights 24 gear section, through the annular space between the inner surface of the housing 23 and the outer surface of the trim body 33, through holes 10 lights 6 turbine section through a rotary pressure turbine 17 and the stator pressure stage 9 zapolnjaete in nadporshnevaya the cavity of the reservoir 38. When the piston 39 equalizes pressure in newportnews and podpornoy (oil) cavity lubricator 38, i.e. all internal oil-filled gear systems section.

After adjusting tool to position "8 - 10 meters above the old bottom" descent of the tool stop; wrapped around the bottom of the upper pipe leading square; includes pump, and the mud motor-reducer, transforming in the turbine the energy flow of the drilling fluid into mechanical options power: speed and torque, implemented in the bit, it starts to work.

When this rotary pressure stage of the turbine of the turbo-drill rotating shaft 11 of the upper turbine section to the left (towards the left screw). Planetary gear (large (stator) gear wheel 27 and the inner (rotary) gear gear 49 section) converts the rotation of the drive shaft 35 in the "right" - right rotation of the driven shaft 36 and its associated shaft 59 of the spindle attached to its bottom end a bit.

Due to the coupling of Oldham, transmitting the torque from the gear 49 on the driven shaft 36, it is possible to reduce the rotational speed of the driven shaft 36 with a corresponding increase torque of the t from the use of gyratory screw engines only what is at much lower pressure differential in the working bodies and provides higher performance bits.

1. The mud motor-reducer comprising three independent, made with the possibility of bonding between a section at the bottom of the spindle, in which case set the seal of the spindle shaft, on which a nut-coupling fixed elements of the seal and the rotary elements of the radial shaft bearing, medium - gear section, in which case using dvuhnitochnogo of the sub fixed bezel case, in which the possibility of mutual rotation has two shaft - master and slave, which is fixed to the internal gear wheel located in a one-sided meshing with a large gear wheel fixed to the trim housing, top - turbine section, in which case using dvuhnitochnogo of the sub fixed stator elements radial bearings, stator pressure stage of the turbine, the stator cage heel and the spacer ring, and on the shaft by a nut fixed rotary elements of the radial bearings, rotary pressure stage turbine rotor axial cage heel and the t direction left screw, and the chord of the blades of the rotary pressure turbine has the right screw, with driving and driven shafts of the reducer section is fixed in the radial and axial position in having the lights trim the chassis using a rotary elements of the radial bearings and angular contact bearings, recorded in turn in the housing of the reducer section defnitely sub, and the drive shaft has a nut-carrier, an eccentric trunnion which with the aid of bearings fixed internal gear, which is connected with the driven shaft of the reducer section through the Cam clutch Oldham, and the seal of the spindle shaft is made of a throttle, this stator elements throttle shaft seal, stator cage heel and the spacer ring is fixed in the housing, the spindle section by threaded nuts, and on the shaft of the spindle by a nut-coupling fixed rotary bushing, throttle shaft seals, rotary cage heel and spacer rings.

2. The mud motor-reducer under item 1, characterized in that the upper part of the driving shaft of the reducer section and the screw is fastened to the piston oil lubricator to the upper part of the body on which the thread cracatoa space with newportnews cavity of the lubricator.

3. The mud motor-reducer under item 1, characterized in that the driving and driven shafts of the reducer section, nut-carrier drive shaft and its eccentric pin and nut-coupling of Oldham the driven shaft are through drilling, hydraulic informing the working cavity of the reducer section podpornoy cavity oil lubricator, and at the end of the driven shaft fixed slotted, square or hexagonal coupling with through drilling, which establishes the discharge valve.

4. The mud motor-reducer under item 1, characterized in that the throttle shaft seal its spindle is a set of rubber on its inner surface of the stator steel liners with a total length of 1.5-2 m fixed in the spindle body using a threaded nut, and a rotary element of the throttle seal is in the form of a set of steel sleeves the same length, the outer surface of which is cemented and tempered to a hardness of 57. ..62 units of Rockwell, fixed on its shaft with splined, square or hexagonal coupling, the thickness of the rubber lining the inner surface of each stator bushing fits in the range from 10 to 20% of the diameter centerbeam 0,1 mm.

 

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