RU163469U1 - CENTER - Google Patents

Abstract

1. A centralizer for drill rods and tubular anchors, comprising a housing with a centering sleeve installed therein with a cylindrical hole, characterized in that the sleeve is integral and the housing is detachable in the diametric plane. The centralizer according to claim 1, characterized in that the conjugation of the housing parts is made on flat surfaces. The centralizer according to claim 1, characterized in that the mating of the housing parts is performed on the profile surfaces. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on the surface of rotation with a diameter in the central part less than in the peripheral. 5. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on the surface of rotation with a diameter in the central part greater than in the peripheral part. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on a cylindrical surface and the end surfaces of the sleeve. 7. The centralizer under item 2 or 3, characterized in that the coupling of the sleeve and the housing is made on a cylindrical surface and the end surfaces of the housing.

Description

Technical field

The utility model relates to the equipment of drilling rigs and can be used when drilling holes and installing tubular anchors.

State of the art

Known tubular centralizer for drill rods, comprising a housing with a centering device installed in it made in the form of bushings installed and secured by clamps in the holes of the housing brackets, the housing brackets are interconnected by a bracket, an external drive cylinder is mounted on the bracket, on the rod of which a key is inserted into the case (see. positive decision on the application for the invention of the Russian Federation No. 2012119148, ЕВВ 17/10).

A disadvantage of the known solution is the design complexity due to the presence of several brackets and a drive cylinder, the rod of which interacts with the housing, which requires increased accuracy of manufacturing the cylinder mount. In addition, the replacement of worn bushings requires a significant investment of time.

The closest analogue to the claimed utility model is a centralizer for centering drill pipes and rods in the wellbore and comprising an elastic inner sleeve composed of three or more fragments and a composite outer casing (see patent WO 2014082183, EV 21/10). All fragments have radial protrusions, and the composite casing has slots corresponding to the protrusions. Fixation of parts of the composite casing is performed by elastic rings.

A feature of the known solution is the design complexity and increased wear of fragments of the elastic sleeve. A significant number of bushings with radial protrusions require increased manufacturing accuracy. Otherwise, the centralizer cannot be assembled with the desired inner cylindrical surface. The presence of dimensional deviations within tolerances leads to the fact that the bushings have a gap on the surfaces of the interface with the composite casing. The reciprocal movement of the drill rod will result in the relative movement of fragments along the casing and their increased wear on the mating surfaces.

Utility Model Disclosure

The technical problem to which the utility model is directed is to simplify the design.

The technical problem is solved in that in the well-known centralizer for drill rods and tubular anchors, comprising a housing with a centering sleeve with a cylindrical hole installed in it, the housing is made detachable along the diametrical plane. The sleeve is made whole, while the coupling of the parts of the housing can be performed on flat or on profile surfaces, and the coupling of the centering sleeve with a detachable housing can be performed according to one of the options:

- on the surface of rotation with a diameter in the central part of the sleeve smaller than in the peripheral;

- on the surface of rotation with a diameter in the central part of the sleeve larger than in the peripheral;

- on the cylindrical surface and the end surfaces of the sleeve;

- on the cylindrical surface and the end surfaces of the housing.

Brief Description of the Drawings

The utility model is illustrated by images.

In FIG. 1 shows a centralizer view from the end surface side. In FIG. 2 is a cross section of the centralizer AA (in FIG. 1), reflecting the implementation of paragraph 1, 4. In FIG. 3 is a frontal sectional view of the centralizer, reflecting an embodiment of paragraph 3. In FIG. 4 is a frontal sectional view of the centralizer, reflecting the implementation of paragraph 5. In FIG. 5 is a frontal sectional view of the centralizer, representing the implementation of paragraph 6. In FIG. 6 is a front view of a centralizer with a slice, reflecting the implementation of paragraph 7.

Utility Model Embodiments

The centralizer for drill rods and tubular anchors includes a housing 1 and a centering sleeve 2 (Fig. 1). The sleeve 2 is made integral, and the housing 1 is detachable. The housing 1 consists of two parts: 3 and 4. Two parts are mated along the plane of the connector 5, 6 which are diametrical, that is, they pass along the diameter 7 of the centering sleeve 2. The surfaces of the connector 5 and 6 are made flat. A possible option is to perform their profile (Fig. 3). Moreover, on one part of the housing, for example 3, the profile is outstanding 8, and on the other (part of the housing 4) the reverse, with the matching profile 9. Parts of the housing 3 and 4 are interconnected by means of threaded fasteners 10.

The execution of the housing 1 of two parts 3 and 4 connected on the surface of the connector 5 and 6, on the diametrical plane, simplifies the procedure for replacing the sleeve 2 in case of wear. And it can be performed without removing the centralizer from the drilling equipment. The presence of profiles 8, 9 on the surface of the connector allows you to securely fix parts of the housing 3 and 4 relative to each other. This eliminates the likelihood of displacement of the sleeve 2 relative to parts of the housing 1.

The execution of the centering sleeve integral simplifies the design and increases the reliability of the centering of the drill rod or anchor, because eliminates the possibility of losing the shape of the cylindrical surface.

The outer surface of the sleeve 2, coupled with parts of the housing 3 and 4 is made in the form of a surface of revolution 11 (Fig. 2). The pairing of the sleeve 2 and the parts of the housing 3, 4 on the surface of rotation 11 provides a simplification of the shape of the parts, the possibility of obtaining them with high accuracy on ordinary equipment.

In this case, the possible implementation of the surface 11.

In the first embodiment (paragraph 4 of the utility model formula), the diameter in the central part 12 - d _{1 is} less than the diameter d ₂ in the peripheral 13 (Fig. 2).

In the second embodiment, the diameter in the central part 12 - d _{3 is} larger than the diameter d ₄ in the peripheral 13 (Fig. 4).

The diameters in the Central 12 and peripheral 13 parts of the sleeve 2, varying in size, ensures its fixation in the axial direction relative to parts 3 and 4 of the housing 1, without additional elements, which simplifies the design.

A possible option is the implementation of the contact surface of the sleeve 2 with parts of the housing 1 on a cylindrical surface 14 (Fig. 5, 6).

In this case, additionally, the sleeve 2 can mate with the parts of the housing along its end surfaces 15, 16 (Fig. 5) or along the end surfaces of the parts of the housing 17, 18 (Fig. 6).

Simultaneous mating on the cylindrical 14 and the end surface 15, 16 or 17, 18 provides greater rigidity of the connection of the sleeve 2 and parts of the housing 3 and 4. In this case, the cylindrical surface 14 provides fixation of the sleeve 2 in the radial direction, and the end surfaces 15-18 in the axial.

The disassembly of the centralizer is carried out in the following sequence.

The centralizer is mounted on drilling equipment (the mount is not shown conditionally, as it may vary for different types of equipment). Fasteners 10 are turned out. Part 4 is released and removed, sleeve 2 is freely removed. The execution of connector 5 and 6 along the diametrical plane eliminates the need for additional actions.

Centralizer assembly.

A sleeve 2 is inserted into part 3. At the same time, its geometrical closure on part 3 is provided without the use of additional elements. Due to the execution of the interface surface in the form of a surface of revolution, the contact area of the sleeve 2 - housing 1 exceeds the contact area of the sleeve 3 - drill rod or tubular anchor. This, in turn, provides a decrease in specific pressure on the mating surface and increases the reliability of fixing the sleeve 2.

Part 4, housing 1, is mounted on the sleeve 2. Parts 3 and 4 are fixed by fasteners 10.

The integral design of the centering sleeve 2 ensures the preservation of the original (obtained during manufacture) form of the working surface and eliminates uneven loading from the side of the drill rod.

The implementation of the diameters of the mating sleeve 2 and parts 3, 4 on the surface of rotation ensures its fixation in the radial direction without additional elements, which allows to simplify the design. Axial fixation of the sleeve 2 is also implemented without additional elements in any of the options for implementation. In any embodiment, the entire structure consists of four parts: a sleeve 2, parts of the housing 3, 4 and fasteners 10. However, their manufacture does not require increased accuracy.

Thus, the proposed technical solutions provide a simplification of the design of the centralizer.

Claims (7)

1. A centralizer for drill rods and tubular anchors, comprising a housing with a centering sleeve installed therein with a cylindrical hole, characterized in that the sleeve is integral and the housing is detachable in the diametrical plane. 2. The centralizer according to claim 1, characterized in that the conjugation of the housing parts is made on flat surfaces. 3. The centralizer according to claim 1, characterized in that the pairing of the housing parts is performed on the profile surfaces. 4. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on the surface of revolution with a diameter in the central part less than in the peripheral one. 5. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on the surface of rotation with a diameter in the central part greater than in the peripheral one. 6. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on a cylindrical surface and the end surfaces of the sleeve. 7. The centralizer according to claim 2 or 3, characterized in that the coupling of the sleeve and the housing is made on a cylindrical surface and the end surfaces of the housing.

Images