Hinge sub

 

(57) Abstract:

The invention relates to a drilling technique and can be used when drilling deviated wells and sidetracks as swivel the drill string or downhole motor. The invention consists in that the hinge sub consists of a casing, a hollow shaft with a spherical reference fifth, the housing and the hollow shaft is made with contact elements for transmission of torque. The device has installed in the housing hollow piston rod seal. The hollow rod has a shank which is placed in the cavity of the hollow shaft and the sealing element is placed on the shank of the rod at a distance of not more than 1/4 of the radius of the sealing surface from the plane passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft. The invention improves the reliability of the device. 2 C.p. f-crystals, 3 ill.

The invention relates to a drilling technique and can be used when drilling deviated wells and sidetracks as swivel the drill string or downhole motor.

Known flexible connection of the drill string, vklyuchyenii of the sub, the upper and lower rings with ball socket (U.S. Pat. USA N 3733853, 464-19, 1973).

The disadvantage of this device is the placement of seals on the contacting surfaces of the ball and rings with ball sockets.

The closest technical solution is known swivel sub, comprising a housing, a hollow shaft with a spherical reference fifth, equipped with contact elements for transmission of torque, spherical thrust bearings mounted in the housing, the sealing element (patent of the USSR 1776282, CL E 21 In 7/08, 1990).

A disadvantage of the known device is the unreliability of the seal that is provided by creating a low pressure area at the outlet of the fluid flow from the channel in the support heel into the hole of the thrust bearing of larger diameter. This mechanism of creating a low pressure area is questionable from the point of view of the elementary laws of hydraulics and will not be able to provide a host of significant leaks in the pair of spherical support feet and heel.

The task of the invention is to enhance reliability of the device by improving the seal and increase its load carrying capacity.

The problem is solved due to the fact that in Sha what elements to transmit torque, for example, teeth, spherical thrust bearings mounted in the housing, the sealing element is supplied mounted in the housing hollow piston rod seal, the shank of which is placed in the cavity of the hollow shaft and the sealing element is placed on the shank of the rod at a distance of not more than 1/4 of the radius of the sealing surface from the plane passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft, with the sealing element is designed as reinforced cuffs, and sealing the gap between the reinforcing element of the cuff and the surface of the hollow shaft is placed at a distance of not more than 1/8 of the radius of the sealing surface from the plane, passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft or the sealing element is designed in the form of a ring mounted in the groove on the inner surface of the hollow shaft at a distance of not more than 1/8 of the radius of the sealing surface from the plane passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft.

The invention consists in the following.

Due to the fact that the sealing element is placed in the cavity of the hollow shaft and in the bore of the spherical reference p and the spherical support feet minimum, therefore, the minimum displacement of the sealing surfaces relative to the sealing element and the minimum change in the value of the sealed gap between the inner surface of the hollow shaft and the rod.

The placement of the sealing element as close to the center of the sphere support feet, so that a plane passing through the center of the sphere perpendicular to the axis of the hollow shaft passes through the sealing element, provides the best conditions for work of the sealing element.

The moving surfaces of the internal cavity of the hollow shaft relative to the rod minimum in the intersection of this plane with the surface of the hollow shaft and in the area near the line of intersection, the width of the zone with the minimum displacement is approximately 1/2 of the radius of the sealing surface, i.e., the sealing element must be placed at a distance of not more than 1/4 of the radius of the sealing surface from the perpendicular plane passing through the center of the sphere support feet.

This ensures not only the minimum value of the displacement of the sealing surfaces relative to the sealing element, but these movements are directed along the tangent to this surface and trace the allows reliable operation of the seal and, therefore, only node swivel sub as a whole.

In Fig.1 shows a swivel sub in longitudinal section; Fig.2 and 3 show variants of the sealing element.

Hinge sub includes a body 1 and the hollow shaft 2, the hollow shaft has a spherical pivot heel 3, in which the outer teeth 4 which engages with the internal teeth of the housing 5. Installed in the housing, the thrust bearings in the form of rings 6 and 7, having a spherical surface in contact with the surface of the spherical support feet of the hollow shaft. The rod 8 with the seal 9 is installed in the housing and has a shank 10, is placed in the cavity of the hollow shaft in the area of the spherical support feet, and the sealing element 11, for example, in the form of a cuff mounted on the shank of the rod so that the area of contact of the seal with the surface of the bore of the spherical support feet is in the plane passing through the center of the spherical support feet, perpendicularly to the hinge axis of the sub.

This provides the minimum distance from the center of the spherical support feet to the contact area of the seal and, therefore, minimal movement of the seal relative to the surface of the bore steriliza 12, preventing extrusion of the cuff into the gap. This design cuff useful when working with high pressure drop, for example, when using the layout above the downhole motor.

In Fig. 3 shows an embodiment of a seal in the form of a ring 11 that is installed in the groove on the bore of the spherical support feet.

This embodiment of the seal provides a larger diameter bore section of the channel of the stem, which can ensure the passage in the channel of the stem shaft of the engine, for example, when installed in a downhole motor between the motor section and the spindle.

The operation of the device is as follows. The housing 1 and the hollow shaft 2 are connected with elements of the drill string, for example with a downhole motor and drill pipe. The engine under the action of the installed casing clamp or other processing element deviates from the axis of the drill pipe, while the spherical support foot 3 is rotated around its center by an angle determined by the angle of deviation of the engine. The axial load on the drill string is transmitted through the ring of 6.7 with a spherical surface on a spherical supporting the heel 3 and further downhole motor and deathpenatly element 11 prevents leakage of drilling fluid into the annulus.

When using this node in a circuit with a downhole motor, when the differential pressure can reach 5-8 MPa, it is advisable to use as a sealing element 11 cuff, reinforced by a metal ring 12, preventing the extrusion of the cuff in the sealed gap. It is necessary to more strictly limit the movement of the cuff and changes the sealed gap, so the sealed gap between the reinforcing element of the cuff and the surface of the hollow shaft must be located at a distance of not more than 1/8 of the radius of the sealing surface from the perpendicular plane passing through the center of the sphere support feet.

In configurations with low pressure drop to 1-2 MPa, for example, when installing the hinge of the sub in the downhole motor between the motor section and the spindle when it is necessary to pass through the sub flow of fluid and the drive shaft of the propulsion section, to increase the bore of the stem, the sealing element 11 is advisable to place in the groove on the inner surface of the hollow shaft, while structurally, the sealing element can be performed in the form of a ring of circular cross section. Given the small size of the cross section of the sealing element, aamoi surface from the perpendicular plane, passing through the center of the sphere support feet.

The advantage of the inventive device in comparison with the known is its high reliability by reducing wear of the sealing element, increasing its load carrying capacity, which significantly increases the service life of the inventive drilling equipment.

1. Swivel sub, comprising a housing and a hollow shaft with a spherical reference fifth, equipped with contact elements for torque transmission, such as teeth, spherical thrust bearings mounted in the housing, a sealing element, characterized in that it has installed in the housing hollow piston rod seal, the shank of which is placed in the cavity of the hollow shaft and the sealing element is placed on the shank of the rod at a distance of not more than 1/4 of the radius of the sealing surface from the plane passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft.

2. Hinge sub under item 1, characterized in that the sealing element is designed as reinforced cuffs, and sealing the gap between the reinforcing element of the cuff and the surface of the hollow shaft is placed at a distance of not more than 1/8 radius of the sealing surface is Mirny sub on p. 1, wherein the sealing element is designed in the form of a ring mounted in the groove on the inner surface of the hollow shaft at a distance of not more than 1/8 of the radius of the sealing surface from the plane passing through the center of the sphere support feet and perpendicular to the axis of the hollow shaft.

 

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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

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