A method of manufacturing a tubular shell of the rotor of the downhole motor

 

(57) Abstract:

The invention relates to equipment for drilling oil and gas wells, and in particular to methods of manufacturing tubular shell of the rotor of the downhole motor. The invention consists in that the forming helical teeth on the tubular shell is exposed on the outer surface of a tubular preform pressure of the fluid using a forming element with external helical teeth while before removing the mold member from the formed tubular shell of the rotor in the gap between them introducing lubricant under pressure to expand the tubular shell. The invention provides for facilitating the extraction of the forming element from the molded tubular shell of the rotor and increasing the durability of the forming element. 1 C.p. f-crystals, 4 Il.

The invention relates to equipment for drilling oil and gas wells, and in particular to methods of manufacturing tubular shell rotor screw downhole motors designed for drilling oil and gas wells. The invention can also be used for the manufacture of rotor screw pumps for oil extraction and pumping gigastorage tubular shell of the rotor of the downhole motor (patent of the USSR 1218740, M CL E 21 In 4/02, publ. 20.01.2000 year ). The method includes forming helical teeth on the tubular sheath pressure of the current environment on the outer surface of the tubular workpiece, within which is mounted a forming element with external helical teeth, which after punching is extracted from the tubular shell.

When forming helical teeth of the tubular shell in contact with the outer helical teeth forming element and the inner surface of the tubular workpiece, the screw teeth of the tubular shell develop high contact stress. During this process, the lubricant, which is covered with a molding element prior to stamping, is squeezed out of the contact zone, which results in increased friction force that must be overcome when removing a forming element of the tubular shell, resulting in a "grasp" of the materials forming element and tubular membranes with subsequent score their helical teeth.

These drawbacks are partially eliminated in the known method of manufacturing a tubular shell of the rotor of the downhole motor (patent of the USSR 1688615, M CL E 21 In 4/02, publ. 10.07.2000 g) includes forming pourmousavi element with helical teeth, and inside the tubular billet before placing it on the forming element imposed on the entire length and across the inner surface of which is subject to deformation, foil of plastic antifriction material. In practice as a plastic antifriction material used copper foil, which reduces friction when removing the forming element of the tubular shell.

The use of copper foil has allowed me to make removing the mold member from the tubular membrane and increase its durability. However, copper foil subjected to high contact loads, does not exclude the danger of occurrence of burrs on the teeth forming element. As practice has shown, sometimes when removing a forming element of the tubular shell of the rotor copper foil is broken and abrasions paired surfaces, which leads to gouging the surface of the forming element, the heating of the tubular shell of the rotor and forming element. These defects are manifested in particular in the manufacture of a multi-tubular membranes of the rotor, as well as the manufacture of tubular membranes of the rotor, having a smaller step screw teeth.

Task this is ment of the molded tubular shell of the rotor and increasing the durability of the forming element.

The problem is solved in that in the known method of manufacturing a tubular shell of the rotor of the downhole motor, comprising forming helical teeth on the tubular shell impacts on the outer surface of a tubular preform pressure of the fluid using a forming element with external helical teeth and removing the mold member from the tubular casings according to the invention before removing the mold member from the formed tubular shell of the rotor in the gap between them introducing lubricant under pressure to expand the tubular shell.

Another difference is that the lubricant in the gap between the forming element and formed by a tubular shell of the rotor is injected under pressure, ensuring the expansion of the tubular shell within its elastic deformation.

With the introduction of lubricant under pressure into the gap between the tubular sheath and forming the element for expanding the tubular shell is an increase in the outer diameter of the tubular shell, and the lubricant penetrates into the gap formed between the tubular sheath and the forming element, which facilitates the extraction of the forming element. When with the hydrated (continued) size, the grease is retained in the gap formed between the tubular sheath and the forming element. Due to this facilitates removing the mold member from the formed tubular shell, it is carried out with the application of a smaller axial force, this avoids scratches on the forming element.

The proposed method of manufacturing a tubular shell of the rotor of the downhole motor is illustrated by drawings.

In Fig. 1 shows a longitudinal section of the device to implement the method before gidroustanovki;

in Fig.2 shows the cross-section along section a-a of Fig.1;

in Fig.3 shows part of the device to implement the method after gidroustanovki;

in Fig.4 shows the cross section along the section b-b of Fig.3.

To implement the method of manufacturing a tubular shell of the rotor assembles the device. On the forming element 1 (Fig. 1, 2) establish the tubular workpiece 2, the centering sleeve 3 and fix them with nuts 4 limit 5 threads forming element 1. The centering sleeve 3 is sealed tightly necks forming element 1 and the end portions of the tubular workpiece 2 sealing rings 6 and 7. In farmhouse is ementa 1.

A method of manufacturing a tubular shell is implemented as follows. The forming element 1 with installed tubular workpiece 2, the centering bushings 3 and nuts 4 wodicka inside of hydrostone (not shown) is sealed and fixed. In a sealed cavity housing hydrostone serves the fluid under high pressure which acts on the outer surface of the tubular workpiece 2. The result is the formation of spiral teeth 12 on the tubular shell of the rotor 13 (Fig. 3, 4), while the air from the cavity between the forming element 1 and a tubular workpiece 2 enters through the openings 8 and 9.

At the end of the process gidroustanovki before removing the forming element 1 of the formed tubular shell of the rotor 13 in the gap between them introducing lubricant under pressure through the axial 8 and 9 radial hole forming element 1. The tubular shell of the rotor 13 extends within the elastic deformation, the formation of the grease gaps between the teeth 11 a forming element 1 and the inner surface of the tubular shell of the rotor 13.

After pressure relief grease tubular shell of the rotor 13 under the force of elasticity of the material of the glasses of the rotor 13 is maintained. Therefore, removing the forming element 1 of the tubular shell of the rotor 13 is at low axial force and without scuffing on the helical teeth 11 a forming element 1.

Example. For the manufacture of a tubular shell of the rotor was used tubular billet with a diameter of 57 mm with wall thickness of 3.5 mm, made of corrosion-resistant steel 12X18H10T. Hidrotambo was carried out at a pressure fluid 250 MPa. After gidroustanovki in the gap between the outer surface of the forming element 1 and the inner surface of the formed tubular shell of the rotor 13 was injected lubricant (industrial oil) at a pressure of 20 MPa, the diameter of the tubular shell of the rotor 13 is increased by 0.1 mm After removal of the pressure the diameter of the tubular shell of the rotor 13 has returned to its initial value, i.e. the tubular shell of the rotor 13 is expanded within the elastic deformation. Removing the forming element 1 of the tubular shell of the rotor 13 occurred when reduced in 2 times tractive effort (50 kN) and without damage to the forming element 1 and the tubular shell of the rotor 13.

Thus, by introducing lubricant under pressure into the gap between the tubular shell of the rotor 13 and the forming element 1 obespecivaet 1 of the formed tubular shell of the rotor 13, excluded burrs on the forming element 1 increases the productivity of the manufacturing process of the tubular shell of the rotor 13 of the downhole motor and lower costs.

1. A method of manufacturing a tubular shell of the rotor of the downhole motor, comprising forming helical teeth on the tubular shell impacts on the outer surface of a tubular preform pressure of the fluid using a forming element with external helical teeth and removing the mold member from the tubular shell, wherein before removing the mold member from the formed tubular shell of the rotor in the gap between them introducing lubricant under pressure to expand the tubular shell.

2. The method according to p. 1, characterized in that the lubricant in the gap between the forming element and formed by a tubular shell of the rotor is injected under pressure, ensuring the expansion of the tubular shell within its elastic deformation.

 

Same patents:

The invention relates to the field of drilling equipment, in particular to screw downhole motors for drilling oil and gas wells

The invention relates to hydraulic actuators for rotary movement, in particular to devices for drilling directional wells

The invention relates to a device for drilling directional wells, namely the angle regulators and reactive torque gerotor motor in a curved string of drill pipes

The invention relates to the drilling technique, namely to the supports downhole motors

The invention relates to techniques of construction of wells, namely, the hinge devices screw gyratory hydraulic machines (screw downhole motors for drilling oil and gas wells and screw pumps for pumping liquids)

The invention relates to mining, namely the screw downhole motors used for drilling inclined and horizontal sections of wells

The invention relates to the drilling technique, namely the screw downhole motors, designed for drilling oil and gas wells

The invention relates to equipment for drilling, and in particular to actuators for rotary drilling, placed in the well

Rotary engine // 2181851

The invention relates to techniques for repair of oil and gas wells, namely, devices for cleaning the inner surface of the casing from cement crusts, scales plaster and wax, which are formed on the inner surface of the casing during operation of the well, and cement plugs in the casing pipes

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

Up!