RU169354U1 - THERMAL INSULATING DRILLING HOUSING - Google Patents

Abstract

The invention relates to the field of insulating devices for boreholes, and more particularly, the present invention relates to the thermally insulating body of a drill string. The technical result of this utility model is to simplify the connection process, in particular to reduce the number of operations required to assemble the device. The technical result is achieved due to the fact that the insulating body of the drill string, which includes at least two parts of the body, each of which contains an inner pipe; an outer pipe connected to the inner pipe and made essentially coaxial with the inner pipe; a heat insulating gasket located at least between the inner and outer pipe. Moreover, the parts of the thermally insulating body contain connecting elements that enable the plug-in connection of the parts of the thermally insulating body with each other. The thermally insulating casing is characterized in that the connecting elements of the parts of the thermally insulating casing to be connected to each other contain centering rails adapted to bring the axes of the casing parts to the desired position relative to each other while aligning the casing parts with each other in the connection position. 5 cp f-ly, 4 ill.

Description

FIELD OF TECHNOLOGY TO WHICH A USEFUL MODEL IS

The utility model relates to the field of isolating devices for boreholes, for example for use in the permafrost zone. In particular, the utility model relates to devices for drilling wells in ice, for example permafrost, rocks. More specifically, the present utility model relates to thermally insulating bodies (directions) of drill strings.

BACKGROUND

A device is known "thermally insulating direction" according to patent RU 74415 U1, published June 27, 2008. The direction (thermally insulating body) contains the inner and outer coaxial pipes and heat insulating material placed between them. The direction is made collapsible from the upper and lower parts. In the joint zone of the upper and lower parts, the inner pipes protrude from the outer pipes and are provided with interconnected flanges. On the outside, the joint zone is covered by a shell, and the cavity between the shell and the inner pipe is filled with heat-insulating material. Fasteners for temporarily fixing the ribs are made on the outer pipe of the lower part of the direction, which are used to support the lower part on the borehole walls during installation of the direction. The ribs are installed before lowering the lower part into the well.

A disadvantage of the known device is the difficulty of assembling a thermally insulating housing, associated with the need to center the upper part of the housing relative to the lower.

An additional disadvantage of the known device is that the flange connection requires additional insulation with a gasket, and also requires high precision manufacturing.

DISCLOSURE OF A USEFUL MODEL

The challenge facing the developers of this utility model was to create a directional design, which simplifies the process of assembling directions.

This problem is solved by creating a thermally insulating body of the drill string, including:

inner tube;

an outer pipe connected to the inner pipe and made essentially coaxial with the inner pipe;

a heat insulating gasket located at least between the inner and outer pipe,

wherein the parts of the thermally insulating body contain connecting elements that enable the plug-in connection of the parts of the thermally insulating body with each other;

characterized in that

the connecting elements of the parts of the thermally insulating body to be connected to each other, contain centering guides made with the possibility of bringing the axes of the parts of the body into the desired position relative to each other when combining the parts of the body with each other in the position for connection.

The technical result of this utility model is to simplify the connection process, in particular to reduce the number of operations required to assemble the device. The technical result is achieved due to the fact that the assembly of the device of the disclosed design does not require operations aimed at ensuring alignment of the parts of the insulating body, and alignment is ensured by the shape of the pipe connection when they are combined. That is, compliance with the alignment of the parts of the thermally insulating body is facilitated.

Additionally, the technical result of this utility model is achieved in the particular case of its implementation due to the fact that

the centering guides are made in the form of counter conical surfaces having substantially equal slope angles to the axis of the conical surface.

An additional reduction in the number of operations necessary for assembling the device is achieved due to the fact that eliminating the need to ensure sealing of the pipe connection by installing sealing gaskets between the flanges, as is required when installing an analogue.

Hereinafter, the disclosed utility model will be described in more detail with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an image of a connection of parts of a thermally insulating body with a local section;

FIG. 2 is a sectional view of the upper flange;

FIG. 3 is a sectional view of the lower flange;

FIG. 4 is an enlarged sectional view of a bolted connection of flanges.

IMPLEMENTATION OF A USEFUL MODEL

According to the present utility model, the insulating core 1 of the drill string includes at least two parts of the housing: the upper part 2 of the housing 1 and the lower part 3 of the housing 1. The upper part 2 of the housing 1 and the lower part 3 of the housing 1 are made with the possibility of collapsible connection with a friend. In working condition of the drill string parts of the housing 1 are interconnected.

The terms "lower" and "upper" are used in the present description to symbolize the parts of the housing 1 relative to each other in the working state of the drill string. In this case, the drill string (or its casing 1) may contain two or more parts connected to each other, while the casing will contain one or more pairs (upper part of the casing and lower part of the casing) of parts of the casing 1, interconnected. Thus, the terms “upper” and “lower” are arbitrary and apply to parts of the housing 1, depending on what relative connection of the parts of the housing 1 is considered the position of the parts of the housing 1.

Each of the parts of the housing contains an inner pipe 4 and an outer pipe 5. The inner pipe 4 and the outer pipe of each part of the housing are operatively connected to each other and placed (made) essentially coaxially with each other. The term "essentially" in relation to the mutual placement of pipes in the present description should be understood that the accuracy of the alignment of the pipes must be sufficient for satisfactory operation of the device, in particular, not have a significant impact on the quality of transmission of mechanical loads, on the tightness of the connection of the parts of the drill string and on its thermal insulation parameters.

In a preferred embodiment, the inner tube 4 of the housing part is longer than the outer tube 5, and the ends of the inner tube 4 protrude from the outer tube 5. The inner tubes 4 of the parts of the housing 1 are connected to each other in working condition. At least between the inner tubes 4 and the outer tubes 5, in a preferred embodiment of the utility model, a thermally insulating gasket 6 is placed containing thermally insulating material. In a preferred embodiment, the connection region of the inner pipes 4 between the outer pipes 5 may be overlapped by a cylindrical shell 7, while a thermally insulating strip 6 containing thermally insulating material is also preferably placed between the shell 7 and the protruding ends of the inner pipes 4. In a most preferred embodiment, the space between the inner tubes 4 and the outer tubes 5 and the space between the inner tubes and the shell are substantially filled with a thermally insulating gasket 6.

In accordance with the present utility model, the parts of the thermally insulating body 1 comprise connecting elements that enable detachable or collapsible connection of the parts of the thermally insulating body 1 with each other. As such connecting elements in various embodiments of the present utility model, flange connection elements, coupling elements, threaded connection elements, or any other known connection and its elements can be used. An additional connecting element may also be a shell 7 and / or parts thereof. In a preferred embodiment of the present utility model, the connecting elements include a flange connection of the inner pipes 4 of the housing parts 1 and threaded elements. In this embodiment, the inner pipes 4 of the upper part 2 and the lower part 3 of the housing 1 may contain flanges at their ends, which are made with the possibility of collapsible connection between themselves. To enable collapsible connection, the flanges may contain holes for a threaded connection and / or threaded elements. In the embodiment shown in the drawings, the hole 8 in the flange 9 of the inner pipe 4 of the upper part 2 of the housing 1 (or upper flange 9) and the hole 10 in the flange 11 of the inner pipe 4 of the upper part 2 of the housing 1 (or lower flange 11) are used. As elements of a threaded connection and connecting elements, studs 16 or any other elements of a threaded connection can be used.

According to the present utility model, the connecting elements of the parts of the thermally insulating housing 1 to be connected to each other contain centering guides, for example, an upper centering guide 12 and a lower centering guide 13. The centering guides are arranged to bring the axes of the parts of the housing 1 to the desired position relative to each other when combining the parts of the housing 1 with each other in the position for connection. The required position here should be understood such a position in which the parts of the housing are connected, for example, the position in which the axis of the inner pipes of the 4 parts of the housing 1 coincide. The terms "upper" and "lower" in relation to the centering rails in the present description should be understood as an indication of that the upper centering guide 12 is connected to the upper flange 9, and the lower centering guide 13 is connected to the lower flange 11. Moreover, in various embodiments of the utility model, the centering guides may have s various shapes and relative positioning.

The centering guides may include opposing inclined surfaces that, when aligning the parts of the housing 1, bring them substantially to the desired mutual position and / or bring them into coaxial position. Such surfaces may comprise flat parts of the surface located at an angle different from straight to the axis of the inner pipe 4. Thus, for example, one of the flanges may comprise a protrusion having a triangular cross section, and the second of the flanges may comprise a recess having a triangular cross section. In this case, the recess and the protrusion are made counter, that is, the protrusion is made with the possibility of entering the recess, and with this entry, the required relative position (or positioning) of the parts of the housing 1 is provided. The counter inclined surfaces can have the same or different tilt angles with respect to axis of the inner pipe of the corresponding part of the housing. In certain embodiments, the protrusion may have a different shape, providing when entering the protrusion the desired relative position of the parts of the housing 1, for example, the protrusion may have a cylindrical shape.

In a preferred embodiment, at least one of the centering rails comprises a conical surface. Thus, the first of the joined flanges may contain a centering guide containing a conical protrusion or conical recess, and the second of the connected flanges may contain a recess or protrusion of the form, respectively providing for the placement or entry of the conical protrusion or recess of the first of the flanges. Moreover, the mentioned entry and engagement in accordance with this utility model bring parts of the housing 1, namely their axis, and / or the axis of the inner pipes 4 to the position required for connection. Preferably, said entry and engagement in accordance with the present utility model bring parts of the housing 1 and / or inner pipes 4 to a substantially coaxial position.

In the most preferred embodiment of the present utility model, the centering guides comprise counter conical surfaces, such that when the parts of the housing 1 are combined to connect the axis of the inner pipes, the 4 parts of the housing 1 come to the position required to connect them to each other. Alignment can be performed by lowering the upper part 2 of the housing 1 to the lower part 3 of the housing, at least part of which is in the well. An example of such an embodiment is shown in the drawings. The upper flange 9 may comprise an upper centering guide 12 in the form of an upper conical surface 14 in the form of a protrusion, and the lower flange 11 may comprise a lower centering guide 13 in the form of a lower conical surface 15 in the form of a recess adapted to receive at least a portion of the upper the centering guide 12. Thus, the centering guides in this embodiment are made in the form of counter conical surfaces 14 and 15. Moreover, the axis of each conical surface is essentially parallel is integral to the axis of the inner pipe 4 and is substantially perpendicular to the plane of the flange that contains it. Moreover, in the position of the parts of the housing 1, when they are interconnected, the axis of the conical surfaces are essentially parallel to each other and the axis of the inner pipe 4 or perpendicular to the plane of the flanges.

In other words, the centering guides contain counter conical surfaces, the axis of each of which is essentially parallel to the axis of the corresponding inner pipe 4, that is, a pipe containing a flange that contains this conical surface. In this case, the conical surfaces are made so that when the flanges of the two parts of the housing 1 being joined together are in a position for their connection, the conical surfaces of the parts of the housing are combined, due to which the axes of the inner pipes 4 of the parts of the housing 1, i.e., the parts of the housing 1 and their axes, are essentially aligned. are brought into the relative position required to join the parts, in particular in a substantially coaxial position.

The term "counter" in relation to conical surfaces in the present description should be understood to mean that the conical surfaces are adapted to enter into each other or to be combined with each other in such a way that with this occurrence the relative position (or positioning) of the parts of the housing 1 and their axes required to connect them. It should be understood that the mutual position in which the parts of the housing 1 and their axes are brought in when the centering guides enter each other may slightly differ from the position when the axes of the inner pipes completely coincide, and should be close enough to it connecting parts of the body to each other.

In the most preferred embodiment of the present utility model, the centering guides are made in the form of opposing conical surfaces having substantially equal slope angles to the axis of the conical surface. In this embodiment, the accuracy of the manufacture of the conical surfaces should be such that the deviation of the parts from perpendicularity and radial runout relative to the axis is not more than 0.5 mm, preferably not more than 0.3 mm. In this embodiment, further simplification of the joining process is achieved, in particular a reduction in the number of operations required to assemble the device. The connection of counter conical surfaces with substantially equal angles of inclination of the conical surface to the axis of the conical surface makes it possible to ensure the tightness of the connection of the internal pipes of the housing parts without the use of a sealing gasket, while installation of a gasket is necessary to ensure the tightness of the connection of flat flanges, which increases the number of operations required to assemble a heat-insulating housing 1 drill string.

INDUSTRIAL APPLICABILITY

Flanges can be made on metal-cutting machines from steel C 345. For this, the workpiece is cut from sheet steel with allowance for further processing. For this, plasma and / or laser installations can be used. Further, on the CNC machines, the workpiece is finished. In this case, it is necessary to comply with the tolerance for perpendicularity and radial runout of the conical surface relative to the technological base in order to enable assembly. The assembly of the body part is done by welding the parts. The positioning of the flange on the pipe is carried out using technological devices: stands and installations. In the manufacture of a preferred embodiment of the utility model, accuracy must be ensured at which the tolerance for deviation from perpendicularity and radial runout is not more than 0.5 mm, in the most preferred embodiment, not more than 0.3 mm; and the roughness of the conical guides in the most preferred embodiment is not more than Rz40.

Installation and assembly of the drill string can be carried out by performing the following steps:

the lower part 3 descends into the well with installed technological stops (not shown);

on top of the lower part 3, the upper part 2 is installed;

when lowering the upper part 2 (or combining it with the lower part 3) combine the upper centering guide 12 and the lower centering guide 13;

until full lowering, the corresponding mounting holes of the flanges are combined, after which the upper part 2 is finally lowered;

technological stops are dismantled;

the thermally insulating body is lowered into the well to the required depth.

In this case, it is possible to manufacture a thermally insulating casing of the drill string of any desired length by connecting the corresponding number of parts of the thermally insulating casing 1 of the drill string in this manner. Moreover, on the intermediate parts of the insulating body 1, the flanges should be made at both ends of the body part 1.

The present utility model has been described in detail with reference to the preferred options for its implementation, however, it is obvious that it can be implemented in various ways, without going beyond the stated scope of legal protection determined by the utility model formula.

Claims (17)

1. The thermally insulating body of the drill string, comprising at least two parts of the body, each of which contains: inner tube; an outer pipe connected to the inner pipe and made essentially coaxial with the inner pipe; a heat insulating gasket located at least between the inner and outer pipe, wherein the parts of the thermally insulating body contain connecting elements that enable the plug-in connection of the parts of the thermally insulating body with each other; characterized in that the connecting elements of the parts of the thermally insulating body to be connected to each other, contain centering guides made with the possibility of bringing the axes of the parts of the body into the desired position relative to each other when combining the parts of the body with each other in the position for connection. 2. The housing according to claim 1, characterized in that at least one of the centering rails comprises a conical surface. 3. The housing according to claim 1, characterized in that the centering guides contain counter conical surfaces made so that when combining the housing parts with each other to connect the axis of the inner pipes of the housing parts, they come to the position required to connect the housing parts to each other. 4. The housing according to claim 3, characterized in that centering guides comprise counter conical surfaces, the axis of each of which is substantially parallel to the axis of the corresponding inner pipe; the conical surfaces are configured so that when two housing parts to be connected to each other are brought into position for their connection, the conical surfaces of the housing parts are combined, so that the inner pipes of the housing parts are brought into a substantially coaxial position. 5. The housing according to claim 1, characterized in that the connecting elements of the parts of the thermally insulating body to be connected to each other are made in the form of flanges containing counter conical surfaces, which, when combined with each other, lead the connected parts of the body to a position in which the inner pipes of the connected parts of the body are essentially coaxial. 6. The housing according to claim 1, characterized in that the centering guides are made in the form of oncoming conical surfaces having substantially equal slope angles to the axis of the conical surface.

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