Downhole drilling motors
The invention relates to the drilling technique, namely, the technical means for drilling directional and horizontal wells. Summary of the invention in that in the known screw downhole motor containing spindle with axial and radial bearings and motor section at the bottom of the spindle is installed combined radial bearing slides reliability, consisting of elastic sliding bearing with work surfaces, one of which is made of metal and the other element of an elastic material and sliding support from the hard work surfaces, which are mounted above the elastic sliding bearing, and the length of the working surfaces of the elastic sliding bearing is not less than 1.5 times the length of the working surfaces of the rigid sliding bearing, in addition, the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing. The invention provides the improvement of technical and economic indicators of well drilling by minimizing the deviation of the wellbore from the predetermined trajectory and increase durability. 3 C.p. f-crystals, 5 Il.
The drilling of the borehole along a given trajectory is one of the technological problems when posting directional and horizontal wells. Currently, this task can be solved with the use of downhole motors, having in its composition spindle section with a set of axial and radial bearings, centralizer, curved or adjustable sub.
Known downhole drilling motors 2-195 (Balenko D. F. and others reference manual “Screw downhole motors”. - M.: Nedra, 1999, S. 35. UDC 622.24.05 (031), BBK 26.2).
The disadvantage of this downhole motor is insufficient rigidity of the lower radial rubber-metal bearings in the spindle section.
Under the action of radial loads on the bit, resulting in the drilling process there is a change in radial clearance in the bearing due to the collapse of the rubber lining in the outer sleeve, and a further increase of the gap in the support due to intensive wear of the working surfaces of the radial bearings with a large departure bits from the radial bearings.
For this reason, to influence the stabilization of the parameters of the curvature is a and azimuth on the drilled section of a borehole and, as a consequence, to change setting drilling or layout of the engine when the deviation of the hole from the specified coordinates.
Known downhole drilling motors containing spindle with axial and radial bearings and motor section, designed for drilling directional and horizontal wells (see Balenko D. F. and others reference manual “Screw downhole motors”. - M.: Nedra, 1999, S. 37). Use in downhole motors rigid radial bearings “metal to metal” as a result of the deflecting force on the bit during drilling is skewed bushings radial bearings, intense and uneven (local) wear of working surfaces. Radial bearings “metal-metal”, when they are set in the lower part of the spindle sections, have low durability, which determines the turnaround time of the engine as a whole.
The present invention is to increase the technical and economic indicators of well drilling by minimizing the deviation of the wellbore from the predetermined trajectory and increase durability.
The goal of the project is achieved in that in the known screw downhole motor containing spindle with axial and radial is made of combination, includes sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material. Bearing slide with hard work surfaces mounted above the elastic sliding bearing, and the length of the working surfaces of the elastic sliding bearing is not less than 1.5 times the length of the working surfaces of the rigid sliding bearing. In addition, the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing.
Due to the distinctive design features of the invention, in comparison with the prototype, we offer a downhole mud motor helps to keep the parameters of the curvature of the wellbore within the prescribed limits and to drill deviated and horizontal wells without labor.
In the present invention, unlike the prototype, due to the fact that the bearing is made of a combination, the radial load on the combined radial bearing of the spindle of the downhole motor is distributed between elastic and rigid supports of Colusa, which consequently reduces wear on the working surfaces of the bearings and the rate of increase of radial play of the shaft, thereby increasing the durability of the engine.
In Fig.1 shows a General view of the downhole motor (motor section); Fig.2 - General view of the motor (spindle) of Fig.3 shows in section a combined radial bearing 10 (Fig.2) in an enlarged scale; Fig.4 is a cross section a-a of the elastic sliding bearing; Fig.5 - cross section b-B hard sliding bearing.
A downhole mud motor (Fig.1-2) consists of sections of motor 1 (Fig.1) comprising a stator 2 and placed inside the stator, the rotor 3, the coupling 4, the flexible shaft 5, the adapter 6, sub 7 and the connecting sub 8, and the spindle 9 with the combined radial support 10. The spindle 9 includes a hollow body 11 in which is located the shaft 12 installed on it combined radial bearings 10, consisting of elastic sliding bearing 13, a rigid sliding bearing 14, the axial bearing 15, the upper support 16 with the sleeve 17 and is connected with the shaft 12 swivel coupling 18. The housing 11 is connected to the nipple 19 (Fig.3) elastic support 13, sub 20 and curved sub 21 with an angle of curvatureusing the data of the radial bearing 10 shown in sections in Fig.2 and 3. Cross section a-a of the elastic sliding bearing 13 is shown in Fig.4. On the shaft 12 mounted sleeve 23 with hardened work surface 24 (Fig.4). The sleeve 23 is placed in the nipple 19, having on the inner surface of the plate 25 has a cylindrical shape from an elastic material (Fig.4). Above the elastic sliding bearing 13 posted by hard bearing slide 14, consisting of outer ring 26 and the inner sleeve 27.
Cross section b-B hard sliding bearing 14 with hardened work surfaces 28 and 29 shown in Fig.5.
Outer ring 26 hard sliding bearing is installed in the housing 11 of the spindle 9, and the inner sleeve 27 is placed on the shaft 12. The working surface 29 of the shroud 26 covers the working surface 28 of the inner sleeve 27.
In Fig.3 shows a length of 30 working surfaces 24 and 31 (Fig.4) elastic sliding bearing 13 and a length of 32 working surfaces 28 and 29 (Fig.5) hard sliding bearing 14.
In Fig.4 shows the radial gap 33 in the pair of working surfaces 24 and 31 of the elastic sliding bearing 13 permitting under the action of radial force radial displacement of the sleeve 23 relative to the valve 19 due to the deformation of the elastic material of the sheath 25 and the return of the sleeve in coaxial position with tsatsoline 14.
For the radial bearing combination, shown in Fig.2 and 3, includes a sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material allows you to place the radial bearing in the immediate vicinity of the bit, resulting in less deformation of the shaft 12 under the action of bending moment of force produced on the bit when drilling a deviated section of the wellbore and the creation of conditions, when the radial load on the working surfaces 28 and 29 hard sliding bearing 14 will be uniformly distributed along its length 32 without causing excessive local wear of working surfaces. Elastic bearing slide 13 having a lining 25 of elastic material in this case is the damper, perceiving radial shock load from the reaction of slaughter.
The establishment of a sliding bearing with hard work surfaces above the elastic sliding bearing, increases the wear resistance of radial bearings and the preservation of the original radial play of the spindle shaft.
In addition, the run length 30 working surfaces 24 and 31 of the elastic Opera 14 1.5-2 times, and radial gap 33 in the pair of working surfaces 24 and 31 of the elastic sliding bearing 13, as shown in Fig.4 is equal to or less than the radial gap 34 in the pair of working surfaces 28 and 29 hard sliding bearing 14 limiting radial displacement of the sleeve 23 and the inner sleeve 27 in elastic and rigid support slide relative to the nipple 19 and the sleeve 26, which reduces wear of the radial bearings, increasing durability and technical-economic indicators of drilling.
We offer a downhole mud motor operates as follows. To sub 7 (Fig.1) is attached column of drill pipe leading from the pump into the engine under pressure working fluid.
The helical teeth of the rotor 3 and the rubber lining of the stator 2, made according to special geometry are in continuous contact form mud on the step length of the stator unit of the camera. The rotor 3 under the action of unbalanced hydraulic forces rotates inside the stator 2, objetivas in the teeth of the stator plates.
The planetary motion of the rotor 3 is converted into an axial rotation of the shaft 12 of the spindle 9 by means of a flexible shaft 5 and the hinge coupling 18, the transmitting torque from the rotor 3 dvigatelnoi 1 and the spindle 9 with a curved angle(Fig.2) sub 21 for drilling a well bore in a predetermined path in the lower part of the spindle 9 are combined radial bearing 10, a longitudinal section of which is shown in Fig.2 and 3.
The advantages of the proposed downhole motor with a combined radial support of increased stiffness in the spindle is that by placing a rigid sliding bearing with a given ratio of the lengths of the working surfaces and radial clearances in the joints, an optimum load distribution on the surface of the friction pairs bearings, increasing their durability and the preservation of the original radial play of the spindle shaft, which is especially important when drilling directional wells, when the bits are high lateral loads.
Alignment of unit loads on the working surfaces of rigid and elastic bearings forming part of a combined radial bearings increases its reliability, durability and rigidity when exposed to lateral forces on the protruding end of the spindle shaft. Elastic support is also damper, perceiving radial shock load from the bit. The downhole motor for drilling deviated nab the technical and economic indicators of drilling wells.
Industrial testing of the downhole motor, consisting of a motor section and spindle with a bent sub and installed in the lower part of the spindle combined radial bearings showed that all kinds of technological operations during the drilling of directional wells in areas of changing the direction of the wellbore is carried out in a predetermined path with high accuracy and efficiency.
1. Downhole drilling motors containing spindle with axial and radial bearings and motor section, characterized in that mounted in the lower part of the spindle radial bearing is made of a combination that includes a sliding bearing with hard work surfaces and elastic sliding bearing with work surfaces, one of which is made of metal and the other element of elastic material.
2. Downhole drilling motors under item 1, characterized in that the bearing slides with hard work surfaces mounted above the elastic sliding bearing.
3. Downhole drilling motor according to any one of paragraphs.1 and 2, characterized in that the length of the working surfaces of the elastic sliding bearing is not less than the about any of paragraphs.1-3, characterized in that the radial clearance in the pair of working surfaces of the elastic sliding bearing is equal to or less than the radial clearance in the pair of working surfaces hard sliding bearing.
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.