Device for screwing and unscrewing pipes
(57) Abstract:Device for screwing and unscrewing drill pipes, casing and tubing used in the process of tripping the drilling and operation of oil and gas wells. The device is a cylindrical housing mounted on bearings in the frame. Inside, there are two rings connected by flexible elements, arranged parallel to the longitudinal axis of the housing circumference. The lower ring connected to the housing with the projections of slots placed in the appropriate boxes of the lower shell. In the same boxes on the tabs of the ring placed springs, providing movement of the lower ring up and down. The top ring can rotate on the bearing relative to the housing. The casing in the upper part constantly braked by the brake. The capture of a pipe located in the internal cavity of the housing, is carried out by means of flexible elements, shifting the center of the inner cavity of the housing and evenly covering the outer surface of the pipe body when the rotation of the upper leading ring relative to the stationary housing. The greater the angle of rotation of the upper ring relative to the bottom, the bol is actiuni tractive effort transmitted by flexible elements of the lower ring, size greater than the friction in the node chassis - brake", the body starts to rotate together with the clamped pipe. Moreover, the greater the resistance to rotation, the greater the force of compression of the flexible elements of the pipe body, that is, increases torque. After completion of the screwing or unscrewing of the springs return the lower ring to its original position, the flexible elements are arranged parallel to the axis of the housing, the device is again ready for operation. The proposed design is simplified and prevents wear on the pipe outer surface. 1 Il. The invention relates to techniques for drilling wells, namely, devices for screwing and unscrewing drill pipes, casing and tubing.A device for screwing and unscrewing pipes, comprising upper and lower grips installed with the possibility of rotation, and the node connecting them (USSR author's certificate N 115325, MKI E 21 B 19/16).The downside of it is the design complexity, the rapid wear of the pipes.The aim of the invention is to simplify the design, elimination of wear of the tubes on the outer surface.This goal is achieved by the ability of reliable coverage of the pipe body for transfer of torque.The drawing shows the device of the screwing-unscrewing pipes, presents the General section of the form.The device consists of a cylindrical housing 1 mounted on bearings 2 in the frame 3. Inside the housing 1 is placed two rings 4 and 5, connected by a flexible elements 6 arranged parallel to the longitudinal axis of the housing circumference. The lower ring 5 is connected to the housing 1 by means of the outer tabs-slots placed in the appropriate boxes of the lower part of the body, in the same boxes on the tabs of the ring 5 placed springs 7 which provides for the movement of the lower ring 5 up and down. The upper guide ring 4 can rotate on the bearing 8 relative to the housing 1 and is connected with the motor 9 through the gear 10. Case 1 in the upper part constantly braked by the brake 11.The device operates as follows.When turning the master ring 4 relative to the stationary housing 1 and fixed to the lower ring 5 flexible elements are shifted to the center of the internal cavity of the housing 1 and uniformly cover the outer surface of the pipe body, which is in the cavity of the housing 1. When the pulling force transmitted by the flexible elements of the lower ring 5, reaches values.Moreover, the greater the resistance to rotation, the greater the force of compression of the flexible elements of the pipe body, i.e., increases torque, transmitted by flexible pipe elements.The feature of this design is that the greater the angle of rotation of the male rings are relatively immobile, the more decreases the distance between the rings vertically, because the length of the flexible elements unchanged. Therefore, the lower ring 5 is fastened in the housing 1 can move the points up and down and is spring-loaded.After completion of the screwing or unscrewing pipes of the motor 9 is stopped and the spring 7 returns the lower ring 5 to the initial position, the flexible elements 6 becomes parallel to the axis of the housing and the device is ready to work. Device for screwing and unscrewing pipes, comprising a housing mounted on bearings in the frame, inside of which are placed two rings, wherein the rings are interconnected by flexible elements, arranged parallel to the longitudinal axis of the housing circumference and having the outreach of the pipe outside diameter and the transfer of torque, while the top ring is made leading to rotate the but and the case locked brake.
FIELD: drilling oil and gas wells; devices for screwing and unscrewing casing pipes.
SUBSTANCE: proposed wrench includes power unit in form of electric motor, hydraulic pump with constant power regulator and tank filled with working medium. Actuating mechanism includes hydraulic motor, gearbox, rotor with pipe grip, movable doors with locks and hydraulic distributor. Constant power regulator is provided with delay unit in form of prestressed spring. Axial-flow piston-type pump is used as hydraulic pump; it is provided with movable unit with spring and its pistons are arranged in inclined position. Constant power regulator inlet is connected with main hydraulic line and its outlet is connected with cylindrical movable unit of hydraulic pump. Constant power regulator may be switched-off by delay unit. Regulator is switched on when output power of power unit and output of hydraulic pump reach the magnitudes preset by the following formulae: where N, are respectively output power and normal output power of power unit; Q are respectively output and nominal output of hydraulic pump; P are respectively pressure and nominal pressure of working medium in hydraulic line, k is proportionality factor equal to 1.
EFFECT: enhanced efficiency, reduced wear; increased universality factor.
FIELD: drilling equipment, particularly devices adapted to lower and lift drill string.
SUBSTANCE: device includes connection parts formed on drilling pipe sections, for instance as sleeve or male half of tool joint with tool-joint threads, rotary key for above members and supplementary means. Supplementary means have cavities with sensors and is built in drilling string. The means are also provided with detachable reinforcing clamp made as bails connected one to another. The bails are arch-shaped and plate-type and are pivotally connected one to another. Inner bail surfaces have extensions inserted in grooves formed in supplementary means so that groove dimensions correspond to that of bail extensions.
EFFECT: reduced size of lock connection and increased free space for measuring tools installation.
3 cl, 4 dwg
FIELD: mechanical engineering, particularly connecting or disconnecting drilling and casing pipe couplings or joints.
SUBSTANCE: key is divided into separate independent technological units and has upper and lower bodies with connectors in front parts thereof. Built in the front parts are toothed rotor wheels in which pipe clamping means are arranged. The key also has gear and intermediate gear assemblies, common drive to rotate and stop the pipes. The drive comprises differential and high-speed reduction gears with hydraulic motors. Upper body may be rotated about pipe clamping means axis to lift or lower thereof relative lower body. The body is provided with thread torqueing/loosening means, braking means and means to supply process lubricant to threaded nipple part of pipe to be screwed on. Lower body has thread torqueing/loosening means. The key also comprises positioner provided with horizontal and vertical key displacement mechanisms.
EFFECT: extended functional capabilities, reduced time to replace clamping members of upper and lower key executive tools and braking system members, increased reliability of device units, increased load-bearing capacity of pipe interlocks.
3 cl, 6 dwg
FIELD: mechanical engineering, particularly connecting or disconnecting pipe couplings or joints, spinning wrenches adapted to connect drilling and casing pipes.
SUBSTANCE: device comprises rotary gear with connector provided with pentahedral profile from inner side thereof and cartridge built in the pentahedral profile. The cartridge has upper and lower discs with four clamping means arranged between them in radial direction. The clamping means are made as shuttle mechanisms comprising bodies and jaws with hard-alloy dies. The bodies are built in guiding cartridges and may perform radial movement during rotary gear rotation. Movable pins are built in clamping device body. Projected pin ends mate projections made in cups. The cups are arranged between cartridge discs and provided with spring. Jaw with die is connected with the body by pin so that after pin disconnection the body may be removed from the guiding cartridge.
EFFECT: increased reliability along with increased load-bearing capacity.
2 cl, 3 dwg
FIELD: mechanical engineering, particularly drilling string and casing pipe connection equipment.
SUBSTANCE: method involves stopping one pipe and rotating another pipe for screwing and unscrewing of above pipes with the use of hydraulic drive and braking system to transmit differently directed torques with the same data along with reactive moment reduction by drive and braking system. Device comprises two coaxial power tongs. Each power tong includes body and pipe squeezing mechanism. The power tongs have common drive including high-speed reducer and differential block kinematically connected one to another. Differential block comprises body with outer and inner toothed crowns, planet carrier with three satellites installed on the carrier, the first tong arranged in body, driven gear kinematically connected to planet carrier and the second tong installed in the body and adapted to cooperate with corresponding gears of pipe squeezing mechanisms. Pipe squeezing mechanism of the first tong is fixedly secured to braking pulley of braking system installed on the first tong body. The braking system comprises four pressing shoes and cylindrical case with hydraulic cylinder for shoe pressing arranged so that cylindrical case may rotate with pulley and pipe squeezing mechanism of the first tong relative pipe squeezing mechanism axis. The cylindrical case is additionally provided with two rests. One rest is fixedly connected with cylindrical case and cooperates with two hydraulic cylinders, which are adapted for thread tightening/unfastening. Another rest is connected with cylindrical case by hinged axis and also cooperates with two other hydraulic cylinders, adapted for thread tightening/unfastening, which provides elimination of reverse reaction and increase of pipe squeezing mechanism torque and locking moment.
EFFECT: possibility to use one drive provided with differential gear to perform screwing/unscrewing operations.
2 cl, 2 dwg
FIELD: mechanical engineering, particularly means for connecting or disconnecting pipe couplings or joints.
SUBSTANCE: pipe wrench comprises body with openable flaps and locking mechanism, releasing rotor with jaws, braking means to provide automatic pipe clamping, hydraulic motor and tooth gears with satellites. The rotor comprises central and two side sectors. One side sector end has threaded orifice to receive regulator, which adjusts mutual sector location. The regulator is made as spherical threaded thrust having spherical part cooperating with end part of central rotor sector. Rotor-satellite spacing setting device, which specifies space between rotor and satellite axes is installed in wrench body. The spacing setting device is made as three cylindrical fingers cooperating with basic rotor surface and installed in threaded orifices formed in wrench body along longitudinal axis thereof. The fingers are also arranged in each openable flap at an angle to longitudinal axis.
EFFECT: increased operational reliability.
FIELD: tubular keys.
SUBSTANCE: tubular key contains jaws with through grooves of "dovetail" type on end surface, replacement dies mounted therein, holders. On side surfaces of jaws, grooves of "dovetail" type are made, into which sliders are inserted for holding replacement dies along end surfaces. Through apertures are made in jaws, wherein spring-loaded holders for fastening sliders are inserted.
EFFECT: increased reliability of assembly for holding replacement dies of tubular key.
FIELD: deep drilling and maintenance of oil and gas wells.
SUBSTANCE: machine spanner contains greater and lesser jaws, jointly connected to handle-lever, which is provided with swivels for holding traction and insurance cables, holding toothed dies on aforementioned jaws, mounted in die holders, latch, jointly connected to larger jaw and adapted for interaction with lesser jaw. Larger jaw is made in form of one- or multi-layered (multi-row) packet of flexible resilient elements, on which a row of die holders is located. A packet of flexible resilient elements is made in form of highly durable ribbons or ropes, provided with eyes for connection of jaws to each other by means of fingers, and also with slit and handle-lever.
EFFECT: increased comfort of operation, decreased hazard of injury and increased lifetime.
4 cl, 7 dwg
FIELD: oil and gas well construction, particularly for casing pipes, flow strings and other technological pipes.
SUBSTANCE: pipe spinning-up method involves seating nipple end on one pipe in clutch end of another pipe, which is fixed from rotation; screwing-in nipple end of the first pipe into another one with increasing twisting moment; aligning mark formed on the first pipe with mark created on clutch end of another, fixed, pipe by rotation of nipple end of the first pipe as pipe ends touch each other; screwing-up nipple pipe end. Nipple pipe end at first is screwed-in by hand. Then above pipes are spun-up up to bringing clutch pipe end to level of transversal mark location on nipple pipe end or below above level. Screwing-up of nipple pipe end is carried out due to resilient deformation of thread members to obtain predetermined interference in threaded connection, seal belts and to achieve good air-tightness of pipe ends abutting each other by smooth shock free twisting moment increase at clutch end temperature of not more than 80°C up to bringing into register of nipple pipe end mark with additional mark formed at clutch end of fixed pipe and spaced apart from the first mark created on above pipe in pipe spinning-up direction, wherein the clutch pipe end is located at level of transversal mark formed at nipple pipe end or is below above end and spaced not more than 0.5 mm from above level.
EFFECT: possibility to demonstrate passed spinning-up stages and pipe assemblage termination due to provision of spaced marks bearing different information.
4 cl, 6 dwg
FIELD: oil production, particularly Connecting or disconnecting pipe couplings or joints, namely means of mechanization of trips associated with sucker rods.
SUBSTANCE: sucker-rod tong comprises head with slot for sucker rod receiving and mounting orifices, handle connected to head to provide cooperation with carrier, fixer, which fixes tong engagement of sucker rod and torsion torque limiter, which limits torsion torque during sucker rod screwing together. Torsion torque limiter has torsion torque regulation means and includes resilient rod, clip and cutoff plate. Resilient rod is threadedly secured to box-like head and is off-centered with respect to sucker rod axis. Corner depression is formed at resilient rod end so that the depression is aligned with end thereof along depression radius. Roller secured to clip cooperates with the depression. Clip is installed on handle by means of pin and is spring-loaded towards handle pin as tong is installed in working position. Cutoff plate is installed on head. Cutoff plate has beveled part reverse to the corner depression of resilient rod. In working tong position roller of spring-loaded clip cooperates with the depression. Handle is supported by pin passing in mounting orifice of head and off-centered with respect to resilient rod and sucker rod axes.
EFFECT: improved operational conditions and decreased accident risk due to possibility to break mechanical connection between carrier and tong at predetermined tightening torque.
4 cl, 2 dwg