The downhole motor spindle

 

(57) Abstract:

The invention relates to the field of drilling wells using downhole motor. In the case of the spindle hole of the engine through the nipple and connecting sub fixed stator elements rubber radial bearings, the stator casing of the axial bearing stator stage rubber seals crankcase axial bearing, the lamp with the holes, indicating the cavity inside the spindle with space for the specified housing, the stator disks of the multi-stage labyrinth seal of the spindle shaft. On the shaft by a nut-coupling fixedly mounted rotary sleeve radial bearings, the rotor cage of the axial bearing, the rotary disks seals crankcase axial bearing, impeller centrifugal pump, rotary disks labyrinth shaft seal. An impeller of a centrifugal pump is located in the inner cavity of the flashlight. The lantern is located between the stator speed mechanical rubber seals crankcase axial bearing and the stator disks of the multi-stage labyrinth seal. The invention provides increased reliability engineering, using which you can build oil and gas wells and, more specifically, to means - downhole motors that go down into the well holes on drill pipe and result in rotation of the bit by which dissolved and deepen their faces.

Complex and still unsolved problem is the creation of a reliable system for sealing a rotating shaft of the rotor of the motor in case of its spindle. The shaft seal spindle should operate on the differential pressure, rabatyvaemy in nozzles bits, i.e. the differences in 70-100 atmospheres, separating the completed drill fluid cavity to the high pressure cavity from the low pressure located over the spindle body downhole motor. The frequency of rotation of the motor shaft of the turbo-drill at idle can reach values in the 1500-2000 rpm Should also be aware of the presence of mud, sand and sludge. Significant leakage of the solution through the seal leads to a corresponding reduction in performance bits because of the deteriorating conditions cleaning downhole drilling and getting into the annular space through the crankcase axial bearing spindle, substantially accelerates its deterioration. So phodiso to ensure ease of starting and stability energy characteristics.

The analogue of our invention is the spindle with a rubber multi-fifth, in addition to performing the functions of the axial sliding bearing function of the labyrinth shaft seal spindle (see page 79 "Downhole motors and spare parts", Moscow, "Nedra", 1980). However, as the show bench and field testing, downhole motors, with the spindles of a similar construction, sand and cuttings from the drilling mud flowing through the flushing grooves in the rubber lining of the pads closed under heavy load end surface of the heel, so distort the original energy performance engines, the shortage of 30% of their rated capacity is not an extraordinary event.

The closest prototype of our invention is the spindle performed as described in the patent of the Russian Federation 2072023, from 20.01.1997,

In this Device. .." (see drawing) is a turbodrill, consisting of a spindle and turbine section. In the case of the spindle through the nipple and coupling (section) of the sub fixedly mounted stator casing of the axial rolling bearing and stator discs (rings) multi-stage labyrinth seal shaft, the second bearing and the rotary discs (rings) labyrinth seal.

Part of mud, bypasing through the labyrinth seal of the spindle shaft, passes through a space in which is located an axial bearing, and through the gap between the inner surface of the male shaft and in the space behind the spindle body.

Sand and fine mud, going with the flow bypasing solution between the discs, can't jam the spindle shaft. A seal of this type is foolproof in operation, therefore is widely used in spindles, exported, and spindles foreign structures screw engines and turbodrills.

However, a fairly large leakage of drilling fluid passing through the crankcase axial bearing, caused rapid abrasive wear of the bearing bracket and his balls, which in turn demanded increasing the axial gap between the stator and rotor disks seals. Therefore, in the limited axial dimensions of these spindles were not able to reduce the leakage of the solution below the level of 4-6 l/s and raise the durability of the spindle to the level exceeding 80-100 hours (during this time, the axial bearing produced a backlash in 6-8 mm, which was threatened by the failure of all pressure stages of the turbine of the turbo-drill).

The essence of our invention is the sealing of the shaft is reduced to the possible minimum, and on the other side of the crankcase, which is the axial bearing is protected from above by a system of multi-stage rubber seals, to prevent thermal metamorphism and combustion rubber end plates and treated with rubber elements are eccentric relative to the main longitudinal axis of the spindle and above the top-most pair of the mechanical seal is mounted a rotary impeller of the centrifugal pump, which discards the sludge and sand together with that part of the solution flow rate, which biasiucci through the labyrinth seal into the holes on the spindle body. Multi-stage labyrinth seal has a rubber stator disks, which are firmly secured in the spindle body. Rotary disks seals respectively fixed on the shaft of the spindle. Thanks to this performance drives labyrinth shaft seal they are going with small values of the axial clearance. This groove, which enters the sand and sludge from baibacirava through the labyrinth seal is a very small part of the flow of mud, are arranged on the side end surfaces of the stator discs which has no rasinovo which protects the seal crankcase axial bearing from wear and thus greatly prolongs its service life.

Our invention allows to increase the trouble-free life of the spindle to the level of 300 hours or more, while not distorting the original energy characteristic of the downhole motor.

The invention is explained in the detailed description and five figures.

In Fig.1 shows a General layout of the spindle hole of the engine.

In Fig.2 depicts a cross-section of the spindle hole of his body and paddle-wheel of a centrifugal pump.

In Fig. 3 shows a cross-section rubber gasket crankcase axial bearing.

In Fig.4 shows a cross-section of the stator disk multi-stage labyrinth seal of the spindle shaft.

In Fig. 5 shows a top view of the stator of the drive multi-stage labyrinth seal.

In case 1, the spindle through the nipple 2 and the connecting sub 3 fixed: stator elements 4 radial bearings spindle with privatkundenbank to them rubber plates 5; a stator cage 6 axial rolling bearing; three-five stator speed mechanical rubber seals 7 Carter axial bearing; lantern with 8 holes 9, internal reporting is analogo labyrinth seal shaft 12 of the spindle. When the disks 11 lined with rubber plates 13, glued or privatkundenbank to the end surfaces of the disks 11. In case 1 there are holes 14, which are hydraulically inform the cavity 10 with a space for housing 1 of the spindle.

On the shaft 12 of the spindle by a nut-coupling 15 fixed: rotary sleeve 16 radial bearings of the spindle; a rotary casing 17 of the axial bearing; a rotor disks 18 seals the crankcase axial bearing; an impeller 19 of the centrifugal pump, which is located in the inner cavity of the lamp 8. rotor disks 20 multi-stage labyrinth seal. On the outer surface of the nut coupling 15 has openings 21, hydraulically informing the internal cavity 22 of the shaft 12 of the spindle with the space located inside the connecting sub 3 and the housing 1 of the spindle.

Stator stage end rezinometallicheskie seal 7 Carter axial bearing is performed so that the maximum value of the radius r2to satisfy the condition

r2r1+ a

and the maximum value of the radius R2respectively

R2R1+ a

where a is the radial width of the rubber uplotnitelya outdoor planting (in case) of diameter D and the longitudinal axis of the shaft 12 of the spindle. This condition ensures thermal stability of physical and mechanical properties of the sealing element 23.

Each stator disk 11 multi-stage labyrinth seal shaft 12 of the spindle is lined by their end surfaces of the rubber plates 13, which are best prevulcanized to the steel surface has a hardness of not higher than 240 Brinell.

For large pieces of mud and rocks, podsalivaya from the walls of the well bore and enters the labyrinth seal shaft 12 of the spindle (at descent hydraulic downhole motor with the bit in the wellbore) would not be able to jam and tear the rubber plates 13 from the disk 11, and therefore, in the process of working spindle under the influence of pressure drop and drag torn lining through the lower-stage labyrinth seal, simultaneously disabling them (the so-called "Domino effect"), uses a special scheme for mounting on the disks 11.

Plates 13 are vulcanized surface flush with the metal disk 11, on both end surfaces of the disks are through holes. On the metal front surface of the disc 11 vipoldyoungporn labyrinth seal.

The work spindle

On the rig to the shaft 12 of the spindle and the screw securing the chisel. Then to the connecting sub 3 is attached or working section screw screw motor, or (sequentially) one or more turbine sections and then heavy pipe, and then the light pipe of the drill string.

The spindle in the General layout of the drill string down the well bore. During the descent through the nozzles of the bit cavity 22 of the shaft 12 of the spindle, the holes 21 of the nut-coupling 15 and the openings 14 in the housing 1 of the spindle through the cavity 10 and the holes 9 in the lamp 8 and the grooves 24 on the disks 11 multi-stage labyrinth seal dirty mud flows through the working section of the engine in a drill string, filling her. When the bit is summed up very close to the bottom of the borehole, includes mud pumps, working section of the motor (mud motor) start to rotate the spindle shaft 12 attached to its lower end with a chisel.

When this dirty drilling mud, filled with the descent of the drill string, starts through the holes 21 in the nut-coupling 15, through the cavity 22 of the shaft 12 of the spindle and then through the nozzles of the bit to prodavlivaetsya in the wellbore. At the same time, under the action of the differential D. the claims 11, hole 9 of the lamp 8, through the cavity 10 and the openings 14 in the housing 1 of the spindle in the space behind the casing (annular space of the well).

In this case, rotating bladed wheel 19 of the centrifugal pump discards the sand and sludge through the holes 9 in the lamp 8 in the cavity 10 and further through the openings 14 in the housing 1 in the space behind the casing 1, thereby ensuring the purity of the rotary disk 18.

Eccentric seals 23 three-to five-speed mechanical seals 7 Carter axial bearing spindle "wipe" wet the surface of the rotating rotary disk 18 from the fine sand, preventing them from falling into the crankcase axial bearing, while being cooled.

The axial bearing, working on a pure bentonite gel, "scored" axial play extremely slowly, which provides a great trouble-free service life of the spindle at the bottom hole drilled wells.

1. The spindle hole of the engine, consisting of a body, which with the help of the nipple and the coupling sub fixedly mounted stator elements of the radial bearings, the stator casing of the axial bearing stator stage mechanical rubber seals crankcase axial bearing stator disks m the rotary sleeve radial bearings, the rotor cage of the axial bearing, the rotary disks seals crankcase axial bearing, the rotor drives a multi-stage labyrinth seal, characterized in that between the stator speed mechanical rubber seals crankcase axial bearing and the stator disks of the multi-stage labyrinth seal is located lantern with holes, hydraulically reporting an internal cavity in which is mounted on a shaft impeller centrifugal pump, through the holes in the spindle body with space for the spindle body.

2. The spindle hole of the engine under item 1, characterized in that the rubber sealing elements stator speed mechanical rubber seals crankcase axial bearing arranged eccentric relative to the axis of the spindle shaft.

3. The spindle hole of the engine under item 1, characterized in that the end surfaces of the stator discs multi-stage labyrinth seals are not covered rubber plates that are flush grooves having a rectangular cross-section.

 

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Rotary engine // 2181851

FIELD: oil and gas extractive industry.

SUBSTANCE: device has metallic hubs of stator and rotor, wherein crowns of stator and rotor are concentrically pressed. Crowns of stator and rotor are made of durable ceramics and are additionally equipped with connections, allowing to exclude non-controlled turning of crowns in hubs and spontaneous axial displacement thereof.

EFFECT: higher reliability and efficiency.

2 dwg

FIELD: mining industry.

SUBSTANCE: method includes physical-chemical treatment of metallic body parts, made in form of two half-cylinders, placement of puncheon within them, preparation of fresh rubber mixture, heating press-form up to 1502C, with following vulcanization of rubber mixture, detaching press-form, removing puncheon and controlling manufacture. Three compounds of rubber mixture are prepared, with following calendaring thereof on shafts and preparing fresh rubber strip of each compound, 0.5-0.6 mm thick, which prior to placement of puncheon in half-cylinders is wound in halving fashion onto the latter. Of rubber strip of compound, providing for durability, inner layer of rubber winding is made, of compound strip, providing for auto-compensation of wear - middle layer, and of strip, providing for hardness of connection between resin and half-cylinders - outer layer. Each layer of rubber winding is made of thickness, determined from relation khw, where h - thickness of each winding layer, mm; k - coefficient, determined empirically, equal to 30-0.35 for inner layer, 0.50-0.60 for middle layer, 0.10-0.15 for outer layer; hw - total thickness of rubber mixture winding, mm. glue covering is applied to each layer and rolled under pressure. After heating of press-form, the latter is placed into one of half-cylinders. Puncheon with rubber winding is deployed and connected to second half-cylinder. After vulcanization and removal of puncheon, rubber-metallic portion of stator is fixed in body pipe.

EFFECT: higher durability and simplified maintenance.

4 cl, 2 dwg, 5 ex

Face engine // 2248436

FIELD: oil and gas industry.

SUBSTANCE: device has turbine module, screw gear couple, including stator and rotor, assembly for connection of rotor of screw gear couple to turbine module and spindle, according to invention, rotor of screw gear couple has pass channel, into which a valve is mounted, including locking element and saddle, while locking element is mounted on resilient element with space to saddle surface and with possible contact with saddle surface. When engine is launched whole flow of drilling mud skirts screw gear couple through pass channel in rotor and open valve, i.e. through space between locking element and saddle surface and is directed into turbine module. In face engine loads on elements of gear couple are decreased during its launch due to redistribution of flows of working liquid between screw gear couple and turbine.

EFFECT: higher reliability, higher durability.

2 cl, 3 dwg

Gear mechanism // 2250340

FIELD: mechanical engineering.

SUBSTANCE: rotor axis of gear mechanism, performing a planetary movement, is displaced relatively to stator axis for distance of engagement eccentricity. As source auxiliary contour ellipse is used, while proportional coefficient k, determining radius of guiding circle, is taken equal to half necessary number of teeth z of wheel (k = z/2), optimal shape of its teeth is provided by rational combination of ellipse shape coefficient λ, equal to relation of lengths of its semi-axes and eccentricity coefficient of auxiliary contour, in form of relation of length of greater ellipse semi-axis to rolling circle radius, while inner and outer profiles are made in form of elliptic profiles from common ellipse contour.

EFFECT: simplified manufacture.

3 cl, 11 dwg

FIELD: oil and gas industry.

SUBSTANCE: roller tracks at edge inner and outer rings are made on same side, roller tracks at inner and outer rings are made with possible contact of balls with roller tracks of inner and outer rings at angle, greater than 45°, angle being formed by line, passing through points of contact of balls with roller tracks of inner and outer rings and line, perpendicular to longitudinal axis of bearing, profile of roller tracks on inner and outer rings is made from inequality condition D1 > (Din + Dout)/2, where D1 - diameter of circle passing through centers of balls in assembled bearing, Din - inner diameter of inner ring, Dout - outer diameter of outer ring, hardness of inner and outer rings being greater than 48 HRC, application point of radius of roller tracks profile on inner rings is placed in plane of stopping end of inner ring.

EFFECT: higher durability and reliability.

4 dwg

Boring rig // 2255194

FIELD: oil and gas well boring equipment.

SUBSTANCE: boring rig comprises turbodrill, drill bit and reducer including several planetary mechanisms and installed in-between. Sun gears of both planetary mechanisms are secured to turbodrill rotor shaft. Carrier with plane pinion axes of upper planetary mechanism is connected to boring rig body. Ring gear is attached to upper link of drill bit. Ring gear of lower planetary mechanism is linked with plane pinion axes of upper planetary mechanism, carrier thereof is connected with lower link of drill bit.

EFFECT: increased efficiency due to increase in turbodrill rotor speed up to optimal value, reduced number of turbodrill steps and hydraulic resistance thereof, increased flushing liquid flow velocity, reduced reactive moment on turbodrill stator and pipe string.

1 dwg

FIELD: oil and gas well drilling equipment, particularly hydraulic downhole motors.

SUBSTANCE: device has screw bottomhole motor comprising sub and body for arranging operating tool sections. Tool sections are mating rotor and stator surfaces made in the form of multistart screw pair. Tangential current-speed and inlet drilling mud direction transducer is installed above screw pair. The transducer comprises body, retaining ring and sealing collar. Blades of the transducer are right-handed (in opposition to helical teeth of the rotor and the stator).

EFFECT: increased mechanical penetration rate due to increased load applied to drilling bit without reduction in power and shaft torque indexes.

3 dwg

FIELD: drilling equipment, particularly for directional drilling, namely control devices adapted to control angle and reactive moment.

SUBSTANCE: control device has hollow central member and three hollow tubular noncoaxial members connected to hollow central member. Inner member is disposed in center between the first and the second members. The first and the second members are connected with inner members by threaded connection. The first member is connected to spindle by threaded coupling, the second member is attached to engine body by threaded coupling and central member is connected to inner member by spline. Each of central member and the first member are provided with sectional contact seats located from spindle connection side, wherein a pair of sectional contact seats arranged from either sides of meridional spindle plane in drilling string curvature plane are defined between central and the first members. Sectional contact seats defined between central and the first members are spaced a distance L from the nearest edges of sectional contact seats of central and the first members along central axis of the first member. The distance L is more or equal to spindle diameter D. Angular deviation of the sectional contact seat formed in the first member from meridian spindle plane in drilling string curvature plane is oppositely directed relative reactive drilling bit moment.

EFFECT: increased stability and angle of gerotor engine deflection and increased accuracy of non-uniform well bottom zone penetration.

2 cl, 10 dwg

FIELD: well drilling equipment, particularly bearings adapted to work in abrasive medium.

SUBSTANCE: radial bearing has body and shaft, as well as thrust collars secured in the body and spring-loaded holders arranged between the shaft and the body. Inserts with conical outer surfaces are located between the holders and the shaft so that inserts cooperate with the shaft and with inner surfaces of the holders. Radial bearing is made as two oppositely arranged blocks and as compression spring inserted in-between. Each block has stop member secured in the body and made as slotted bush. Inserts are arranged in the bush and may perform displacement in radial direction. Thrust collars have conical surfaces cooperating with outer surfaces of the inserts. Angles α at apexes of the cones defined by interacted conical surfaces of bearing support inserts, thrust collars and holders are correlated with friction coefficient μ of interacted surfaces as tg(α/2)≈μ. Insert surfaces cooperating with shaft surface may have coating of elastomeric or hard-alloy material. In accordance with the second embodiment surfaces of inserts, thrust collars and holders interacting one with another may have flat contact zones, which are inclined at (α/2) angle to longitudinal shaft axis.

EFFECT: increased operational reliability of radial bearing.

6 cl, 3 dwg

FIELD: oil and gas well drilling equipment with the use of hydraulic downhole motors.

SUBSTANCE: support-and-centering member is made as metal hub with blades connected to spindle connector. Spindle connector has support cone formed on outer surface thereof and adapted to provide rigid connection with metal hub from inner surface thereof. Support cone of the connector is formed from side of conical thread connecting spindle body with connector. Spindle connector has splines to connect thereof with metal hub. Metal hub is pressed with pressing cone, retaining washer and nut from another side thereof. Metal hub may be installed concentrically or eccentrically to spindle connector axis or outer surface thereof may be differently shaped and arranged eccentrically, concentrically or obliquely with respect to spindle connector axis.

EFFECT: reduced costs of spindle usage.

5 dwg

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