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.
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.
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 150±2°C, 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 k·hw, 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
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
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.
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.
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.
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.