Automatic stationary drill key

 

(57) Abstract:

The invention relates to equipment for drilling oil and gas wells and is an automatic stationary drill key, which can be used for screwing and unscrewing of the threaded joints of drill and casing pipes. The key includes a housing mounted therein the upper and lower robotainua device, gearbox, drive motor and momentaner. The key is supplied mounted in a separate housing of the gearbox, which is located above the gear, coaxially with the input shaft of the gearbox. Over the gearbox posted planetary gear coaxially with the low-speed shaft of the gearbox. The gearbox housing is fixed to the housing in a stationary position. The housing of the planetary gear is able to rotate around the axis of the slide bearing. Momentaner key has a lever mechanism, a movable stop torque adjustment and a valve system to automatically switch off the drive motor after reaching the set torque of screwing up. A movable stop mounted on the lid of the planetary gear and is rotated together with the housing of the planetary gear. All remained the aqueous torque lever under the action of reactive power mobile stops, turns, overcoming the spring force of the valve lever, and opens this valve. The pressure through the valve lever is supplied shut-off valve which closes and shuts off the air supply to the drive motor. The key allows you to produce high-quality screwing - unscrewing threaded joints of drill and casing pipes and provides fine adjustment of the torque value. 2 C.p. f-crystals, 3 ill.

The invention relates to oilfield equipment and is intended for screwing and unscrewing the threaded connections of the pipes constituting the column, in the process of the descent-ascent of the column in the well.

Known automatic stationary drilling keys for screwing and unscrewing of the drill and casing pipes, comprising a housing, upper and lower robotainua device, the drive motor, gearbox, remote control and momentaner (ed. St. 203590, MKI E 21 In 19/16, 1967).

The disadvantage of this key is that due to the lack of reliable information on the amount of torque and the impossibility of its exact adjustment is not provided accurate and high quality work by screwing and unscrewing the pipe string.

Naibi case, the upper and lower robotainua device, gearbox, drive motor, momentaner, transmission, momentaner spring configuration node torque value (patent 2143051, MKI E 21 In 19/16, priority from 10.07.98,). This key has several disadvantages, namely:

1. The center of gravity of the gearbox, flywheel and drive motor is with high eccentricity relative to the bearing mount the gearbox to the gearbox key. This leads to a large inertial loads when the cart is the challenge key, parametric oscillation and overload bearing the reference node.

2. The key has a static clamp pipe, i.e., the first jaw grab the pipe, and then rotates together with the pipe. Then, when the break is no kinetic energy in the rotating parts of the key and the key flywheel will not increase torque breakaway. If the pipe swiney torque (0,85-1) MCR.maxthen Unscrew the pipes the key will be not capable. Thus, the presence of key flywheel is a lack of design.

3. The configuration node of the key at a given point has a very very inaccurate, because it is not adjustable to the efforts of the pru is vinciane and especially the unscrewing of threaded connections due to inaccurate information about the amount of torque when screwing and low torque at the break.

The aim of the invention is the creation of a key of a more perfect design, which would provide a qualitative screwing and unscrewing the threaded connection of the downhole pipe, and allowing for precise adjustment of the torque.

The invention is illustrated by drawings, on which:

Fig.1 - General view of the automatic stationary drilling key;

Fig.2 is a longitudinal section of the drilling of the key shown in Fig.1;

Fig. 3 - momentaner drilling of the key shown in Fig.1 ( in section), in an enlarged scale.

To achieve the goal proposed a key, comprising a housing 1 (Fig.1) mounted on the support column 2 with the guides 3, which can move the housing 1, the transmission 4, the drive motor 5, the planetary gear 6, momentaner 7 and the remote control 8.

In the case of the key (Fig.2) top mounted trubine device 9 clusterization 10, which can be set in rotation by a vertical fingers 11, which are fixed through the intermediate disk 12, to split the pinion gear 13. The housing is placed lower trubine device clusterization 14, which can bring obesegenic devices are known. Each trubine device includes a pair of jaws 15 with crackers 16 and installed in the pockets of the upper and lower clustermates. The jaws are provided with rollers (Fig. 2 is not shown) that communicates with the liners (not shown) placed in the housing 17 and the housing upper robotizing device.

On the top clusterdata mounted pneumatic disk brake device, consisting of a bottom disc brakes 18 and the upper disc brakes 19, associated with the upper clusterization 10, top 20 and bottom 21 of the brake pads, stationary drive housing of the brake 22, fixed against rotation, the finger 23. In the case of brakes made blind cylindrical bore in which there are 10 pneumatic cylinders with spring-loaded pistons 24. High-speed shaft of the gearbox 25 is connected through a splined sleeve 26 with the low speed shaft of the gearbox 27. The gearbox housing is mounted on the housing in a stationary position. On the body of the box top is bearing planetary gear 29. In the support has a sliding bearing 30 in which is mounted a housing of the planetary gear 31. Thanks to this setup, the planetary gear can rotate around-ear, closed the major shaft of the gearbox and is rigidly connected with immovable in the axial direction of the coupling 33. The coupling 33 is connected with the high-speed shaft 34 through the gear 35. High-speed shaft 34 is connected with the low speed shaft 27 through the gear 36 with integrated the coupling 37. Movable coupling 38 may connect the carrier of the planetary gear 32 with the low speed shaft 27 directly through a coupling 33, or through high-speed pinion shaft 34. On the bracket 39 of the transmission housing (Fig. 3) and the cover of the planetary gear 40 mounted momentaner 7 (Fig.1). Part of momentaner includes a movable stop 41, the lever 42 and the system of two valves: shut-off valve 43 and the valve lever 44.

Work automatic stationary drilling key as follows. For screwing a threaded pipe connection, first the rotation of the screw 45 movable stop 41 move the focus carriage 46 so that the pointer 47 is stopped at the desired value of the moment vinciane on the scale of the lever 42. Then the key casing slides over the threaded junction strand pipes slot trubobetonnykh devices. Turn the bottom of calystegines clamped stationary (lower) pipe. Then on up the coupling transmission, which provides a direct connection of the planetary gear with the low speed shaft of the box p is the effort of the spring-loaded pistons in the brake housing 22 is the capture and subsequent rotation of the movable (upper) pipe at a fast speed. The torque delivered by the key at a fast speed is negligible, and does not require restrictions. If the reactive torque will exceed displayed on mementomori and the lever 42 rotates, opening the valve lever 44, the triggering of a shut-off valve 43 does not occur, because the pressure on the brake and the valve lever 44 is missing. When you stop the rotation due to the increased moment of resistance in carving the operator applying pressure from the remote control switches the movable clutch down to connect it through a coupling 37 with the gear 36. When the pressure in the pneumatic brake and the force with which the jaws of the upper truboservice hold the pipe increases. Simultaneously, the pressure under the valve plate of the lever 44, but the valve is closed to passage of air. The key rotates the pipe at a slow speed and is zakreplenie thread. At this moment resistance in the thread and the torque delivered by the air motor, and grow. Correspondingly increases and the reactive torque on the housing of the planetary gear. When the torque delivered by the key reaches the value set by the pointer 47 movable end of the carriage 46, the lever 42, overcoming the spring force of the valve 44 will expand by opening valve 44 for the passage of air, n is its consequences. The process of screwing up is terminated upon reaching the specified torque.

The process of uncoupling occurs in the reverse order. First, applying pressure with the remote turns on the air-brake and movable clutch is switched down. Turns on slow speed. As the rotation of the air motor is now directed to the opposite side, and the reactive torque as directed in the opposite direction, so mobile not stop pressing on the lever and can't turn it. The housing of the planetary gear is not rotated in the direction opposite to the arm side as the emphasis available in the lid of the planetary gear ( not shown) that abuts against a stationary stop in the support 29 of the planetary gear. The time of unscrewing does not require restrictions, it is determined by the moment of resistance in the thread decoupling pipes. When removing the tension of the thread, when the pipe starts to otvincivatmisa and resistance in the thread falls, the operator switches the transmission at fast speed (coupling 38 is included up) and performs a disconnecting.

The key proposed design has high reliability, allows to perform the screwing-unscrewing threaded soy is automatic stationary drill key comprising a housing mounted therein the upper and lower robotainua device, gearbox, drive motor, gear box, planetary gearbox and momentaner, characterized in that the transmission is located above the gearbox, and its case attached to the gear housing is stationary and aligned with the low speed shaft of the gearbox is mounted planetary gear, the body of which is made floating relative to the axis of the low speed shaft.

2. Automatic stationary drill key under item 1, characterized in that momentaner key includes a movable support, a lever to adjust the amount of torque and valve system for disabling the drive motor to achieve the specified torque screwing.

3. Automatic stationary drill key under item 1, characterized in that the upper brake robotizing device is made of three disks, the extreme of which are associated with clusterization, and the average fixed disk made blind cylindrical bore in which is placed the spring cups, and the braking torque can be increased at the right time through the feed bore under glasses compressed air.

 

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