RU188493U1 - Thermal insulation direction of the borehole - Google Patents

Abstract

The utility model relates to devices used in the oil and gas industry, in particular, to thermally insulating areas for drilling wells in permafrost areas to prevent their thawing. The essence of the utility model: the thermally insulating direction of the borehole is made collapsible and consists of two or more sections, each section contains an inner and outer pipe and has the ends of the inner pipe protruding from the outer pipe, the lower end of the inner pipe of the upper section is connected to the upper end of the inner pipe lower section by means of a threaded coupling. In the cavities between the outer surface of the inner tubes and the inner surface of the outer tubes and in the cavities between the protective element and the ends of the joined inner tubes, a heat-insulating material is placed. In the joint zone of the sections, the outer tubes overlap the protective casing, made of the two halves of the molded tube, which are connected by a detachable connection. At the same time, along the first pair of joined edges, sleeves with a common geometrical axis are attached as connecting elements, through which a screw-cutting rod passes along end sections on which nuts are screwed, and along the second pair of edges, corners are attached as parallel connecting elements bolted connection. The two halves of the formed pipe are connected along the first pair of edges with the possibility of rotation around the specified rod until the second pair of edges is joined. The casing is provided with sealing elements closing the gap between this casing and the outer tube. Technical result: ease of installation and reducing the time of installation of the insulating direction of the borehole while increasing the reliability of the connection sections and the durability of the junction points of the sections of insulated pipes that make up the device. 2 Il.

Description

The utility model relates to devices used in the oil and gas industry, in particular, to thermally insulating areas for drilling wells in areas of perennial (permafrost) permafrost to prevent their thawing.

Thermally insulated column of pipes is known (RF Patent No. 2197594, CL Ev21V 17/01, published on January 27, 2003), which includes concentrically arranged sections of external pipes with a junction and internal pipe sections, in the annular space between which heat insulating and shielding materials are placed and thermal expansion joints, made in the form of a loop-shaped bracket with cylindrical shells and placed at the joints of the column section at the level of connecting nodes, elastic rings installed between adjacent pipe sections in their assembly The joints, the temperature expansion compensators are located at one end of the inner tube and are rigidly connected by one cylindrical end of the shell to the outer surface of the inner pipe, and the other cylindrical end of the shell is slidably mounted on the inner pipe and rigidly connected to the inner surface of the outer pipe, the bends of the compensator thermal expansion is equal to one third of the annulus gap, and the distance between the inner walls of the base of the loop-shaped bracket equals h = 2 / 3R, where h is the distance between the inner walls of the base of the loop-shaped bracket, mm; R is the bending radius of the bracket, mm.

Known design is characterized by the complexity of manufacturing, increased mass and limited depth of descent due to the fact that it does not provide insulation and thermal protection of the direction of the borehole at great depths.

This feature is due to the peculiarities of thermal insulation of the pipe, which has low thermal insulation characteristics.

A steel thermally insulated pipe is known, the heat insulating coating of which is made in the form of an epoxy resin composition applied to the pipe surface with glass microspheres in the amount of 60% of the volume and 4 mm thick, and a protective layer in the form of a reflective aluminum foil is placed on the heat insulating coating Patent of the Russian Federation for utility model No. 62643, CL Ev21B 17/00, 04.24.2007)

When using a known technical solution, relatively high heat losses occur due to the design features of the pipe in question, namely, frequent damage to the reflecting screen during transportation and installation.

Thermal insulation direction is known (RF patent for utility model No. 74415, class EV21B 36/00, publ. 27.06.2008), containing inner and outer tubes and thermal insulation material placed between them, and the direction is made collapsible from the upper and lower parts , in the joint zone of which the inner tubes protrude from the outer tubes and are provided with interconnected flanges, the joint zone is blocked by a shell, while the cavity between the shell and the inner tube is filled with insulating material, and on the outer tube of the lower part Fasteners for temporary fixation of the ribs to be supported on the walls of the well during the installation process.

The application of the known technical solution detects the high complexity of its installation during tripping, in addition - this solution is acceptable only when drilling at small depths of large diameter. This factor is due to the fact that the known thermoisolating direction is installed in a cylindrical shaft, prepared only by auger drill, and allows you to install no more than two parts of the thermoisolating direction, the installation is carried out only with a crane, in addition, the auger drilling is unacceptable for large depths.

It is also known insulating direction of the borehole, made collapsible, each section of which contains an inner and outer tubes and insulated material placed between them, consists of two or more sections, each of which, in the joint zone, has protruding ends of the outer tube with the lower end of the inner pipe of the upper section connected to the upper end of the inner pipe of the lower section by means of a threaded coupling of the joint, and the joint zone of the outer pipe of each section overlaps shell, and each cavity between the shell and the interconnected by means of a threaded coupling coupling inner tubes filled with insulating material, and as the insulating material used polyurethane foam or mineral wool. The heat-insulating material in the cavity between the shell and the inner pipes connected to each other is two heat-insulating half-shells. Moreover, the above common features with

The claimed technical solution relates to a tool of the same purpose, described in patents:

- RU No. 160010 (Cl. Е21В 36/00, published. 02.27.2016);

- RU # 182283 (Е21В 36/003, 17/003, published on 13.08.2018).

This device does not solve the technical problem associated with the complexity of installation during tripping. Shell - protective elements made in the form of cylindrical pipes, it is difficult to put on any of the ends of the sections of the outer pipe and fix it with clamps to the outer pipe. In addition, this type of shells can not be manufactured in industrial conditions in the manufacture of sections of the thermally insulating direction of the borehole. So, in the manufacture of sections of the thermally insulating direction of a borehole with an outer diameter of the outer pipe of 630 mm and an outer diameter of the inner casing of 426 mm, the shell size should be 642-644x6-7 mm, which is difficult to assemble in production conditions, and even more so when installing in areas permafrost at temperatures - minus 40 ° degrees and below.

The tool from the patent RU No. 182283 selected as the closest analogue.

Thus, the proposed utility model solves the problem of increasing the operational and installation capabilities by installing a thermally insulating direction when drilling wells to a great depth.

The technical result provided by this device is to ease the installation and reduce the time of installation (installation) of the thermally insulating direction of the borehole while increasing the reliability of the connection sections and durability of the junction points of the sections of thermally insulated pipes that make up the device.

The essence of the proposed utility model is that in the thermally insulating direction of the borehole, which is made collapsible and consists of two or more sections, each section contains inner and outer pipes and has the ends of the inner pipe protruding from the outer pipe section is connected with the upper end of the inner pipe of the lower section by means of a threaded coupling, in the zone of the junction of the sections the outer pipes overlaps the protective element, in the cavities between the outer surface in the inner tubes and the inner surface of the outer tubes and in the cavities between the protective element and the ends of the connected inner pipes are placed insulating material; the creation of a protective element in the form of a casing consisting of two halves of a molded pipe, which are connected by a detachable joint, is placed

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is the connecting elements attached along the edges of each half of the formed pipe, while along the first pair of edges being connected, the hubs with a common geometric axis are attached as connecting elements through which the threaded rod passes through the end sections on which the nuts are screwed, and along the second pairs of edges as corners are attached corners, parallel shelves of which are bolted together, with the two halves of the formed pipe connected along the first pair of edges with the possibility of rotation around the specified rod until the connection of the second pair of edges.

The achievement of the technical result is due to the presence of a detachable connection on the protective casing, with the help of which the installation of a thermally insulated direction is provided. Thus, the area of the junction of sections with thermally insulating material is not necessary to protect the other element than the two halves of the molded pipe, the straight edges of which are connected by the corresponding elements.

To reduce the installation time, different types of connections are used as connecting elements for each pair of joined edges of the halves of the molded pipe. Making the joint in the form of sleeves attached along a pair of edges, having one geometrical axis, makes it possible to insert inside the data sleeves a rod with a screw thread, on which the nuts are screwed. Turning the two halves of the formed tube relative to the fixed rod allows you to “uncover” the protective element, covering the section junction area, then “collapse” the two halves of the protective element to bolt together parallel corners of the corners of the formed pipe. It should be noted that such a connection, which has on one side of the sleeve with the rod passing through them, can be made in the factory, and not at the place of installation of the thermally insulating direction. This design of the detachable connection is also aimed at ease of installation and reducing the time for its installation.

Based on the above, a detachable connection of a protective casing made of the two halves of a molded pipe contributes to ease of installation, shortening the installation time and reliability, and also, in the presence of sealing elements, leads to an increase in the period of operation (to an increase in durability).

These and other features of the insulating direction of the borehole are illustrated by drawings, which depict:

- figure 1 is a General view of the proposed device (in a vertical orientation);

- figure 2 is a General view of the node of the junction of the sections.

A pre-assembled, thermally insulated direction of a borehole may consist of two or more sections. The drawing shows a thermally insulating direction comprising three sections 1, each of which contains an inner casing 2 (for example, a casing 426x11 mm in size) and an outer single-seam welded pipe 3 (for example, a 630x8 mm pipe). Between pipes 2 and 3 of each section 1 is placed insulating material 4 (for example, polyurethane foam).

Each of the 1 in the joint zone has protruding from the outer pipe 3 the lower ends 5 of the inner pipes 2 connected by a threaded coupling 6 with the upper ends 7 of the inner pipes 2. For the coupling of the end sections 5 and 7 of the inner pipes 2 of the adjacent sections 1 an OTM type thread is applied (casing, triangular coupling; thread for coupling with triangular thread), OTTG (casing, trapezoidal, tightness; casing with trapezoidal thread with increased tightness) or with a resistant thread BATRESS-OTBR-426.

In the joint zone of adjacent sections 1, the outer pipes 3 are enclosed by a protective casing 8 made of two halves 9 of a molded pipe, while the cavity formed between the protective casing 8 and the inner pipes 2 of adjacent sections 1 connected by a sleeve 6 is filled with insulating material 4 formed in the zone joint in the form of two shells. Thermal insulation material 4 between the pipes 2, 3, and in the zone of the junction of sections 1 is polyurethane foam or glass wool.

The two halves of the molded pipe 9 with an inner diameter of 630-632 mm are made with connecting elements on the mating edges, which are centering sleeves 10 having a common geometric axis, and on the other hand, the corners 11 with holes 12 are welded. 13c screw threading along the end sections on which the nuts are screwed (not shown in the drawings). The parallel corner shelves 11 are connected by bolts installed in the openings 12. It should be noted that the rod 13 is mounted so that the two half 9 of the molded pipe (casing 8) can be open, i.e. the opposite edges of the casing 8 with the corners 11 have the opportunity to be in the open state in order to freely cover the outer pipes 3 and to be in the reduced state for the bolted connection of the shelves of the corners 11.

Thus, the proposed design of a detachable connection of the protective casing predetermines the ease of installation of the thermally insulating direction and reduction of installation time due to the fact that there is no need to use clamps, screeds and other fasteners that do not contribute to productive installation.

To ensure the tightness of the junction of adjacent sections of the thermally insulated direction from the effects of adverse factors (moisture), the honey gap with the outer surface of the pipe 1 and the inner surface of the casing 8 can be closed with four identical sealing elements 14, made in the form of a U-shaped cross-sectional profile and made of flexible material such as rubber or polyurethane. In addition, each sealing element 14 is worn on the end portion of the half-formed pipe 9 so that the side portions of the sealing element fit tightly into the above-mentioned gap. Thanks to the U-shaped profile and the implementation of flexible material, it is easy to install the two halves of the molded pipe on the end parts, and the tight junction of the side parts of the sealing elements to the outer surface of the outer pipe is due to the function performed - to seal the space of the junction zone of the sections.

The displacement of the sealing elements 14 in the vertical direction (in which the thermally insulating direction is oriented) is prevented by the plates 15 in the amount of four, installed by welding to the outer surface of the pipe

I. The location of the plates 15 is dictated by the possibility of their contact with the surface of the corresponding sealing element. One plate may be located above the connection of the halves 9 of the molded pipe using the sleeves 10 and rods 13, and the second plate above the connection of the casing using the corners

II, bolted. Similarly, in order to prevent the lower sealing elements 14 from moving, two plates 15 are welded under the joints of the two halves 9 of the shaped tube.

The use of a tremo-insulating direction and the sequence of mounting sections is described in detail in the scientific and technical literature and is known to a person skilled in the art, in particular, from the patent description for utility model RU No. 160010.

The use of the inventive insulating direction is characterized by the fact that the two half 9 of the molded pipe (casing 8) are connected on one side with the use of bushings 10 and rod 13 in the factory, and in installation conditions

the heat-insulating direction remains to connect the corners 11 by bolting at opposite edges of the molded pipe (protective casing 8).

From the above, the conclusion follows: the proposed design of the utility model allows for thermal insulating directions in the conditions of one enterprise, to supply them complete with protective and sealing elements, and the use of thermal insulating direction, in turn, will improve operational capabilities by reducing its installation time and convenience installation thanks to the construction of a detachable connection of the protective casing, made of two halves of the formed pipe with the possibility of covering zones interface without having to be worn on the exterior of the pipe sections.

Claims (1)

The insulating direction of the borehole, made collapsible, includes two or more sections, each section contains an inner and outer pipe and has the ends of the inner pipe protruding from the outer pipe, the lower end of the inner pipe of the upper section is connected to the upper end of the inner pipe of the lower section by means of a connecting thread couplings, in the zone of joint of the sections of the outer tubes, covers the protective element in the cavities between the outer surface of the inner pipes and the inner surface of the outer pipes and in the cavities A heat-insulating material is placed between the protective element and the ends of the connected inner pipes, characterized in that the protective element is made in the form of a casing consisting of two halves of a molded pipe, which are connected by a detachable connection, which is attached along the edges of each half of the molded pipe to be joined, along the first pair of joined edges, sleeves with a common geometrical axis, through which the rod passes, are attached as connecting elements with screw threading along the end sections on which the nuts are screwed, and along the second pair of edges, corners are attached as connecting elements, the parallel shelves of which are connected by a bolt joint, the two half-shaped pipes are connected along the first pair of edges with the possibility of rotation around the specified rod until the moment of connection second pair of edges.

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