EA034114B1 - Device for moving equipment in production casing - Google Patents

Abstract

The invention relates to petroleum industry and can be used in the devices designed to relocate downhole equipment in an oil well. The device for relocating downhole equipment in the production casing consists of a housing 1 with windows 2, in which the balls 4 are positioned on the support 3. The support 3 is screwed into the cover 5 which covers a part of the surface of the ball 4 with its dome 13, and has shoulders 6 along its circumference, the cover 5 is able to interact with the mating shoulders 7 of the sleeve 8, also threaded in the window 2. The ends of the support 3 interact with Belleville springs 12. The housing 1 is made with through passage, therefore it has a special central opening 9, which allows the pressurized working fluid to pass to the downhole equipment, for example, to a perforator. The housing 1 has a tapered shank 10 with external thread on one side, and a shank 11 with internal thread on the other side. The technical effect is in reducing the time spent on hoisting operations and wear of downhole equipment during the hoisting operations.

Description

The invention relates to the oil industry and can be used in devices designed to move downhole equipment in the well.

Centralizers are known, which are devices that perform a support-centering function, which are used where wells are drilled to take oil and gas. These devices are installed on a drill string or a downhole motor, directing them in the right direction, which allows you to straighten the axis of the borehole and, if necessary, change the direction of the well. From the point of view of the claimed technical solution, a sliding centralizer is of particular interest, including a housing with end parts in the form of centering elements and ribs for their connection, rolling elements located in the centering elements, with a uniform pitch, characterized in that the centering elements are made in the form of centering rings (consisting of bearings), consisting of an inner ring, rolling elements (moving metal balls) and an outer ring in the form of a separator separating rolling elements g from each other and holding them at an equal distance, while the movable metal balls are made with the possibility of point contact with the walls of the well with the possibility of reducing friction when lowering the drill string (utility model patent RU No. 127805, publ. 05/10/2013) .

A device for lowering and retrieving deep well equipment is known, which consists of a housing made with a groove in which the balls are placed and connected by means of a thread with an adapter, a fishing head made in the form of a rod of variable diameter, in the upper part of which a gripping head is made, this groove of the housing with the balls placed in it, holding the gripping head in the housing, is not through, and the rod is connected to the guide sleeve and the trap, which is made with an internal hole TIFA for balls and threaded socket for connecting the deep well equipment (utility model patent RU number 109 788, publ. 27.10.2011 city).

The following technical solutions were also identified in this technical field: patents for invention RU No. 2515141, 2602241 and patent CN 102305032.

The closest technical solution chosen by the applicant as a prototype is a device for installing an anchor in a well, comprising an anchor with a body, balls, a movable cone, springs and a tapered shank for extracting the anchor and a drive on a cable or wire having a body, balls, spring-loaded a movable sleeve connected through a shank to a cable or wire. The windows for the anchor balls are inclined at an angle approximately equal to the sliding friction angle of the contacting materials. The movable cone of the anchor is performed with a taper value equal to two tilt angles of the window under the balls. The gap between the balls and the movable cone during the descent of the anchor provide the calculated ratio of the stiffness of the spring of the armature and the mass of the armature. The conical shank of the anchor is hooked by the balls of the drive (patent for utility model RU No. 81254, publ. 10.03.2009).

The disadvantage of this design is that due to the low operational reliability, it cannot be fully used for various tripping operations with different downhole equipment.

The technical task of the invention is the creation of a device that improves operational reliability by reducing wear of downhole equipment when moving it in the production string while reducing the time it takes to carry out one tripping operation.

EFFECT: reduced time for hoisting operations and reduced wear of downhole equipment during hoisting operations.

The technical problem is achieved by the fact that the claimed device for moving equipment in the production casing, which contains a housing with windows in which spring-loaded balls are located, a tapered shank, and each ball is mounted on an appropriate support, which is connected to the cover, covering part of the surface of the ball with its dome and having circumferential shoulders, and the lid has the ability to interact with the mating shoulders of the sleeve, additionally installed in the window, at the bottom of the window Belleville springs are installed flaxly, the upper of which interacts with the support, while the housing is continuous, and on the one hand has a tapered shank with an external thread, and on the other hand, a shank with an internal thread.

The balls preferably have a diameter of 10-24 mm.

Comparison of the claimed technical solution with the prototype shows that it differs in the following features:

each ball is mounted on an appropriate support;

the support is connected to the cover;

the lid covers with its dome a part of the surface of the ball;

the lid has shoulders around its circumference;

the cap has the ability to interact with the mating shoulders of the sleeve;

- 1 034114 bush installed in the window;

disk springs are installed at the bottom of the window;

the upper disk spring interacts with the support;

the housing is made through;

the housing on the one hand has a tapered shank with an external thread, and on the other hand, a shank with an internal thread.

Therefore, we can assume that the claimed invention meets the criterion of novelty.

The invention can be manufactured on standard equipment, so it meets the criterion of industrial applicability.

A feature of the claimed design is that it is not the ball located in the window that is spring loaded, but the support on which the ball is located together with the cover. When damping the oscillations of the descent device, the ball moves radially together with the support and the sleeve, while the dome of the sleeve, covering part of the ball, prevents the ingress of external contaminants, such as abrasive impurities, under the ball, and also holds the lubricant inside the window. Also, experimental data showed that the diameter of the balls must be selected from a range of diameters of 10-24 mm. The inventive design allows you to accurately copy the relief of the column when the device is moving with the correct selection of the stiffness of the disk springs depending on the total weight of the equipment. The diameter of the balls less than 10 mm is not advisable, because with strong waxing of the column surface or a sufficiently large amount of rust, small balls sink. The use of balls with a diameter of more than 24 mm leads to an increase in the overall dimensions of the design of the device, which increases the consumption of materials.

When conducting patent information research, the claimed combination of features was not identified, therefore, the claimed technical solution meets the criterion of inventive step.

The drawings depict the claimed design of a device for moving equipment in a production casing.

The device consists of a housing 1 with windows 2, in which balls 4 are located on the support 3. The support 3 is mounted by means of a thread in the cover 5, which, through the dome 13, covers part of the surface of the ball 4 and has shoulders 6 around its circumference, the cover 5 being able to interact with mating shoulders 7 of sleeve 8, mounted in window 2 also by thread. The ends of the support 3 interact with the Belleville springs 12, which, with small dimensions and with a smaller stroke, can provide significant effort and have rigidity sufficient to damp radial vibrations of the downhole equipment block. The housing 1 is made through, for this it has a Central hole 9, which allows the passage of the working fluid under pressure to the downhole equipment, such as a perforator. On the one hand, the housing 1 has a tapered shank 10 with an external thread, and on the other hand, a shank 11 with an internal thread.

The inventive device (pair) is installed on both sides of the assembled block of downhole equipment using the corresponding shanks 10 and 11, while one of the shanks is attached to the tubing pipes. Then the fully formed block is lowered to the required depth. In this case, the balls 4, spring-loaded by means of Belleville springs 12, are in contact with the wall of the production casing, and the block moves in the pipe on the balls 4. When moving, the balls 4 compensate for the radial vibrations of the entire block. A design feature is that downhole equipment when lowering or lifting does not touch the walls of the production string, which eliminates the wear of body parts. Also, the design allows you to quickly replace the worn balls 4. To do this, turn the sleeve 8 out of the housing 1 and then the support 3, replace the ball 4 and install the parts in the reverse order.

Thus, the claimed invention allows to reduce the wear of the body parts of the downhole equipment and reduces the time for tripping due to the fact that the rolling resistance is much less than the frictional resistance, and during operation of the inventive device its friction against the column inside the well is eliminated. At the same time, reliability of downhole equipment transportation in the production string is ensured.

Claims (2)

CLAIM 1. A device for moving equipment in a production casing, comprising a housing with windows in which spring-loaded balls are located, a tapered shank, characterized in that each ball is mounted on an appropriate support, which is connected to the cover, which covers part of the surface of the ball with its dome and has its own the circumference of the shoulders, and the lid has the ability to interact with the mating shoulders of the sleeve, additionally installed in the window, Belleville springs are sequentially installed at the bottom of the window, hnyaya of which interacts with the support, wherein the housing is a through, on the one hand and has a tapered shank with an external thread, on the other hand - the shank with an internal thread. - 2 034114 2. The device according to claim 1, characterized in that the balls are made with a diameter of 10-24 mm