RU2244089C2 - Up-driven swivel - Google Patents

Abstract

FIELD: drilling equipment.

SUBSTANCE: device has body, shaft placed in it having axial and radial supports, rotating tool including drive for transferring rotation by cog-wheel to shaft and to drilling column connected thereto, support for automatic elevator on swivel body and feeding tool. Drive is made in form of hydraulic engines. Shaft is connected to body by quick-detachable connection and is made with possible extraction from body during hoisting operations for placement of pipes block in body hollow. Feeding tool is made in form of chain wheels connected to hydraulic engines via displacing cog wheels, for displacing swivel along chains tensioned inside the rig.

EFFECT: higher effectiveness.

2 dwg

Description

The invention relates to equipment for drilling oil and gas wells. It can also be used in other industries carrying out tripping operations during the well drilling process.

Known top-drive swivel [1].

It consists of a housing, an engine, a disc brake, a trunk, guides and an elevator suspension assembly.

The disadvantage of the top-drive swivel is that it allows you to carry out tripping operations to change the worn bit only in conjunction with the tackle system and with the suspension to its upper elevator body.

Also known is the top-drive swivel [2].

It consists of a body with a barrel placed in it with axial and radial bearings, a rotational body for transmitting rotation through the gear to the barrel and the associated drill string, a suspension for an automatic elevator on the swivel body and the feeding organ.

The disadvantage of this overhead swivel is that it works in conjunction with a tackle system that limits the lifting speed of the drilling tool, which leads to a significant investment in time for tripping. In addition, due to the multilayer laying of the hoist rope on the winch drum (3-4 layers), the rope wears out intensively, which leads to additional time and money spent on the rope bypass or its replacement.

The top-drive swivel [2] is closest to the claimed top-drive swivel and is taken as a prototype.

The proposed upper-drive swivel is designed to eliminate the noted deficiencies and increase on this basis the technical and economic indicators of well drilling.

The technical result of the claimed top-drive swivel is that it allows to reduce the duration of hoisting operations by eliminating the tackle system and using a set of mechanisms to automate hoisting operations.

The technical result from the use of a top-drive swivel is achieved by the fact that the drive is made in the form of hydraulic motors, while the barrel is connected to the housing by means of an upper quick-detachable connection and is made to be removed from the housing during tripping operations to place pipe candles in the cavity of the housing, and the feeding body is made in the form of moving sprockets connected with hydraulic motors by means of gears to move the swivel along chains stretched inside the tower.

Figure 1 shows the inventive top-drive swivel; figure 2 shows a section aa. It consists of a housing 1, hydraulic motors 2, gears 3 displacement, sprockets 4, chains 5, located in the barrel housing 6 swivel with axial 7 and radial 8 bearings, hoses 9, bend 10, gear 11 of the barrel, lock connection 12 Suspension 13 for automatic elevator. Instead of hydraulic motors in the overhead swivel, DC motors can be used.

Works upper swivel as follows. When drilling a well, the flushing fluid is supplied by the mud pump through branch 10 to the inner channel of the drill string, starting from the swivel shaft 6, and then to the bit. The rotation of the swivel barrel 6 and the associated drill string is transmitted from the hydraulic motors 2 by means of a gear wheel 11; the movement of the top-drive swivel during drilling is carried out by hydraulic motors 2 along the chains 5 stretched inside the tower with the help of sprockets 4; the chains are stretched between the floor of the drill and sub-block frame, one on each sprocket, and during the operation of the chain transmission, the chains 5 are pressed against each other by the sprockets 4, which eliminates the deflection of the chains 5.

At the end of the drilling process, the mud pump is turned off, the swivel barrel 6 is unscrewed in the castle connection 12 and in the upper quick connection 14 and suspended in the drilling. An automatic elevator is installed on the suspension 13, which captures the drill string located on the rotor table, the hydraulic motors 2 are turned on and the drill string is lifted by the length of the candle using the gear wheels 3 and the sprockets 4 and chains 5. The unscrewed candle passes through the cylindrical cavity formed in the upper-drive swivel body after removing the swivel barrel 6, which allows to combine the time of screwing or unscrewing the drill string tool joints with the movement of the upper-drive swivel and thereby reduce the time spent on tripping.

When the drill tool is launched, operations are performed in the reverse order.

Sources of information:

1. Composite Catalog of The Oil Field Eguipement and Services, 1993, p. 540-541.

2. EP 0196284 A1, 05/28/1984.

Claims (1)

A top-drive swivel comprising a body, a barrel with axial and radial bearings, a rotary body including a drive for transmitting rotation by means of a gear to the barrel and an associated drill string, a suspension for an automatic elevator on the swivel body and a feeding body, characterized in that the drive is made in the form of hydraulic motors, while the barrel is connected to the housing by means of a quick-detachable connection and is configured to be removed from the housing during hoisting operations for I place pipes in the cavity of the candle body, and the feeding organ is made in the form of moving chain wheels connected with hydraulic motors by means of gear wheels to move the swivel along the chains stretched inside the tower.

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