CN114955858A

CN114955858A - Method and apparatus for downhole installation of tubing

Info

Publication number: CN114955858A
Application number: CN202210354726.XA
Authority: CN
Inventors: 张平柱; 胡石林; 储诚节; 艾丽斯佳; 叶一鸣; 王越田
Original assignee: China Institute of Atomic of Energy
Current assignee: China Institute of Atomic of Energy
Priority date: 2022-04-06
Filing date: 2022-04-06
Publication date: 2022-08-30

Abstract

The embodiment of the invention discloses a method and equipment for installing a pipeline in a well. The method comprises the following steps: installing a clamping device at the fixture block of the pipeline, so that the clamping device is matched with the fixture block to clamp the pipeline; hoisting the clamping device on one of the sections of the pipeline to hoist the pipeline, moving the pipeline to the wellhead and putting the pipeline into the well until the clamping device on the pipeline is clamped at the wellhead; hoisting another pipeline, moving the pipeline to the position above the wellhead, dropping the pipeline to be in butt joint with the pipeline clamped at the wellhead, and welding the two pipelines; hoisting the pipeline by hoisting the clamping device on the pipeline above, detaching the clamping device on the pipeline below, and putting the welded pipeline into the well until the clamping device on the pipeline above is clamped on the wellhead; and repeating the steps until all the pipelines are put into the well.

Description

Method and apparatus for downhole installation of tubing

Technical Field

The embodiment of the invention relates to the technical field of cryogenic rectification, in particular to a method and equipment for installing a pipeline in a well.

Background

Large bore vacuum jackets are an important component of cryogenic rectification systems and often require installation in deep wells. One of the core processes for installing vacuum casings in deep wells is downhole installation. At present, a special lifting lug is arranged on each section of vacuum casing pipe in the conventional method, but the operation method is complex in process and large in workload, the requirement for the gap between the vacuum casing pipe and an external protective casing pipe is large, and the risk of being stuck exists in the process of descending the well.

Disclosure of Invention

According to one aspect of the invention, a method of downhole installation of a tubular is provided. The pipeline is a multi-section pipeline, a plurality of clamping blocks are arranged on each section of pipeline along the circumferential direction of the pipeline, and the clamping blocks are located on the same horizontal plane. The method comprises the following steps: step S10, installing a clamping device at the fixture block of the pipeline, so that the clamping device and the fixture block are matched to clamp the pipeline; step S20, hoisting the pipeline by hoisting the clamping device on one section of the pipeline, moving the pipeline to a wellhead and putting the pipeline into the well until the clamping device on the pipeline is clamped at the wellhead; step S30, hoisting another pipeline, moving the pipeline above the wellhead, dropping the pipeline to be butted with the pipeline clamped at the wellhead, and welding the two pipelines; step S40, hoisting the other section of pipeline above the well by hoisting the clamping device on the other section of pipeline above the well, detaching the clamping device on the pipeline below the other section of pipeline, and putting the welded pipeline into the well until the clamping device on the other section of pipeline above the well is clamped on the wellhead; repeating steps S30-S40 until all of the plurality of lengths of tubing are placed into the well.

According to another aspect of the present invention there is provided apparatus for downhole installation of a tubular, comprising: the clamping blocks are arranged along the circumferential direction of the pipeline and are positioned on the same horizontal plane; the clamping device is matched with the shape and the size of the pipeline, and the clamping device is detachably connected to a clamping block of the pipeline and used for clamping the pipeline; and the hoisting device is connected with the clamping device and is used for hoisting the clamping device and the pipeline clamped by the clamping device.

Drawings

Other objects and advantages of the present invention will become apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, which are set forth to provide a thorough understanding of the present invention.

FIG. 1 is a schematic diagram of a duct according to one embodiment of the present invention.

Fig. 2 is a schematic structural view of a clamping device according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a method of downhole installation of a tubular in accordance with one embodiment of the present invention.

It is noted that the drawings are not necessarily to scale and are merely illustrative in nature and not intended to obscure the reader.

Description of reference numerals:

10. a pipeline; 11. a first conduit; 12. a second conduit; 20. a clamping block;

30. a clamping device; 31. a clamping member; 311. a first support plate; 312. a second support plate; 313. a connecting portion; 314. a reinforcing portion; 315. a lifting part; 32. a fastener;

40. a hoisting device; 50. and (4) fixing the platform.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be described below in detail and completely with reference to the accompanying drawings of the embodiments of the present application. It should be apparent that the described embodiment is one embodiment of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the application without any inventive step, are within the scope of protection of the application.

It is to be noted that, unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. If the description "first", "second", etc. is referred to throughout, the description of "first", "second", etc. is used only for distinguishing similar objects, and is not to be construed as indicating or implying a relative importance, order or number of technical features indicated, it being understood that the data described in "first", "second", etc. may be interchanged where appropriate. If "and/or" is presented throughout, it is meant to include three juxtapositions, exemplified by "A and/or B" and including either scheme A, or scheme B, or schemes in which both A and B are satisfied. Furthermore, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein for ease of description to describe one element or feature's spatial relationship to another element or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.

One embodiment of the invention provides equipment for downhole installation of a pipeline, which can be applied to downhole installation of a vacuum bushing, thereby realizing the installation of the vacuum bushing in a deep well. Of course, the device in this embodiment may also be used for installation of other pipes in deep wells, and the embodiment of the present invention is not limited.

In the embodiment of the invention, when the length of the pipeline is longer, the pipeline can be formed by connecting a plurality of sections of pipelines, and in the installation process of downhole installation, the plurality of sections of pipelines can be sequentially installed downhole, so that the downhole installation of the whole pipeline is realized.

The equipment for installing the pipeline in the well comprises a fixture block 20, a clamping device 30 and a lifting device 40. The fixture 20 is disposed on the pipe 10, the clamping device 30 is matched with the pipe 10 in shape and size, and the clamping device 30 can be detachably connected to the fixture 20 of the pipe 10 for clamping the pipe 10. The lifting device 40 is connected with the clamping device 30 and is used for lifting the clamping device 30 and the pipeline 10 clamped by the clamping device.

Fig. 1 shows a schematic structural view of a pipe according to an embodiment of the present invention. As shown in fig. 1, a plurality of blocks 20 are disposed on the pipe 10 along a circumferential direction of the pipe, and the plurality of blocks 20 are located on the same horizontal plane. When the pipe 10 is installed in a well, the pipe 10 can be clamped at the fixture 20 by the clamping device 30, and the pipe 10 is lifted by taking the fixture 20 as a stress point to perform the installation in the well.

This embodiment is through setting up a plurality of fixture blocks 20 on the pipeline, realizes the installation of going into the well of pipeline through clamping device 30 and fixture block 20 cooperation, and simple structure is reliable and easily operation, has improved the efficiency of pipeline installation of going into the well to the problem of installation operation difficulty of going into the well when having avoided setting up dedicated lug on the pipeline. When being applied to vacuum sleeve, the fixture block on the vacuum sleeve cooperates with clamping device 30 to realize the installation of going into the well of vacuum sleeve, compares in setting up special lug on vacuum sleeve, has avoided the problem that the clearance between vacuum sleeve and its outside protective case requires greatly and blocks easily, has saved the space, has reduced the requirement to the outside clearance of vacuum sleeve.

Further, the blocks 20 are uniformly arranged along the circumferential direction of the pipe 10, so that the stress of each block is uniform when the pipe is hoisted, and the pipe is ensured to be in a vertical state when being hoisted. In some embodiments, when the length and/or the weight of the pipe are increased, the number of the latches 20 provided on the pipe 10 may also be increased according to actual needs, so that a plurality of the latches 20 can bear the weight of the pipe 10, and the pipe 10 can be stably lifted by the cooperation of the plurality of the latches 20 and the clamping device 30.

Optionally, a predetermined distance is provided between the fixture 20 and the end of the pipe 10, so that the pipe 10 can be lifted by the cooperation of the clamping device 30 and the fixture 20, the pipe 10 can be stably lifted and positioned in the air, and the center of gravity of the pipe 10 is prevented from being unstable in the air.

In some embodiments, the cartridge 20 is welded to the tube 10. Optionally, the lower surface of the fixture block 20 is not welded, and the other three surfaces are fully welded, so that the clamping device 30 is prevented from being clamped below the fixture block 20.

Fig. 2 shows a schematic structural view of the holding device 30 according to one embodiment of the present invention. As shown in fig. 2, the clamping device 30 in this embodiment includes two semi-annular clamping members 31 and a fastening member 32, which are oppositely disposed. Wherein, a space for accommodating the pipe 10 is enclosed between the two clamping pieces 31, and the space is matched with the shape and the size of the pipe 10, so that the clamping device can clamp the pipe more firmly. The fastening members 32 are provided on opposite sides of the two clamping members 31 for coupling and locking the two clamping members 31 to clamp the pipe 10.

Specifically, the fasteners 32 may include attachment members and retaining members, such as bolts. Two be provided with the through-hole on the opposite side of holder 31, the position of the through-hole on each holder 31 is corresponding with the position of the through-hole on another holder 31, the connecting piece passes the through-hole on two holders in proper order in order to connect two holders, and passes through retaining member locking two holders that link together.

The present embodiment can realize the installation clamping and the disassembly of the clamping device on the pipeline 10 through the locking and the unlocking of the fastening member 32.

As shown in fig. 2, the clamp 31 in the present embodiment includes a support portion and a connection portion 313. Wherein the support is semi-annular and matches the shape and size of the pipe 10. The connecting portions 313 are disposed at two ends of the supporting portion, and the fastening member 32 is connected to the connecting portions 313 for correspondingly connecting and locking the connecting portions 313 at two ends of the two clamping members 31.

In some embodiments, the support portion may be a hollow semi-annular block, the inner annular surface of which matches the size of the pipe 10 so as to be attached to the outer wall of the pipe 10 when the clamping device 30 clamps the pipe 10, thereby firmly clamping the pipe 10. The connection portions 313 are sidewalls at both ends of the support portion, and the fastening members 32 are connected to the sidewalls at both ends of the support portion of the two clamping members to connect and fasten the two clamping members to clamp the pipe.

In some embodiments, the supporting portion includes a first supporting plate 311 and a second supporting plate 312, and the connection portion 313 is connected between the first supporting plate 311 and the second supporting plate 312. The first support plate 311 and the second support plate 312 are semi-annular plates, and when the clamping device is clamped on the pipe 10, the inner annular surfaces of the semi-annular plates can be attached to the outer wall of the pipe 10.

Further, at least one reinforcing part 314 is further arranged between the first support plate 311 and the second support plate 312, one end of the reinforcing part 314 is connected with the first support plate 311, and the other end is connected with the second support plate 312, so that the weight which can be borne by the support part is reinforced, and the support of the support part on the pipeline is reinforced.

In this embodiment, when the clamping device 30 is clamped to the pipe 10 and the pipe 10 is suspended, the fixture block 20 is located above the first support plate 311, the first support plate 311 contacts with the lower surface of the fixture block to form a force point, so that the clamping device 30 supports the fixture block 20 and the pipe 10, wherein the second support plate 312 and the reinforcing part 314 can increase the weight borne by the first support plate 311. Alternatively, the latch 20 is clamped between the first support plate 311 and the second support plate 312, the second support plate 312 contacts with the lower surface of the latch 20 and forms a stress point, and optionally, the distance between the first support plate 311 and the second support plate 312 matches with the size of the latch 20, so that the clamping device 30 stably supports the latch 20 and the tube 10.

Furthermore, each connecting portion 313 is further provided with a lifting portion 315, the lifting portions 315 on the two clamping members 31 are correspondingly arranged, and the lifting portions 315 are used for connecting with the lifting device 40, so that the lifting device 40 lifts the clamping device 30 and the pipeline 10 clamped by the clamping device. When the two clamping members 31 are combined and clamped on the pipe 10, the positions of the lifting parts 315 on the two clamping members 31 correspond to each other.

In this embodiment, the lifting device 40 includes a lifting rope and lifting buckles disposed at two ends of the lifting rope. The lifting part 315 may be a connection hole formed in a connection part, when the two clamping members 31 are combined and clamped on the pipeline 10, the positions of the connection holes of the two clamping members 31 correspond to each other and form a through hole, and lifting buckles at two ends of the lifting rope are respectively connected to the hole holes at two sides of the clamping device 30, so as to connect the clamping device 30 and the lifting device 40.

The equipment for installing the pipeline in the well is simple and reliable in structure and convenient to manufacture, improves the lifting, transferring and well descending efficiency of large-diameter pipelines such as vacuum pipelines, and reduces the operation cost. The structure of the downhole installation equipment in the embodiment has large bearing capacity, and is safe and reliable.

The device in the embodiment is applied to the downhole installation of the vacuum sleeve in the low-temperature rectification system, and the ordered switching and implementation of the vacuum sleeve group on the well mouth in the processes of welding and hoisting downhole can be realized.

Another embodiment of the present invention further provides a method for hoisting a pipeline downhole, which can be implemented by the apparatus described in the above embodiment. The method in the embodiment can be applied to hoisting of the vacuum casing in the low-temperature rectification system in the deep well, and can also be applied to downhole installation of other pipelines.

FIG. 3 shows a schematic diagram of a tubular downhole installation according to one embodiment of the present invention. The method in this embodiment specifically includes the following steps.

Step S10, installing a clamping device at the fixture block of the pipeline, so that the clamping device and the fixture block cooperate to clamp the pipeline.

And step S20, hoisting the pipeline by hoisting the clamping device on one section of the pipeline, moving the pipeline to the wellhead and putting the pipeline into the well until the clamping device on the pipeline is clamped at the wellhead.

And step S30, hoisting another pipeline, moving the pipeline above the wellhead, dropping the pipeline to be in butt joint with the pipeline clamped at the wellhead, and welding the two pipelines.

And step S40, hoisting the other section of pipeline above the well by hoisting the clamping device on the other section of pipeline above the well, detaching the clamping device on the pipeline below the other section of pipeline, and putting the welded pipeline into the well until the clamping device on the other section of pipeline above the well is clamped on the wellhead.

Repeating steps S30-S40 until all of the plurality of lengths of tubing are placed into the well.

In this embodiment, a plurality of blocks 20 are disposed on the pipe 10, and the outer diameter and the radian of the blocks 20 match with those of the pipe 10. The plurality of clamping blocks 20 are arranged along the circumferential direction of the pipeline 10 and are positioned on the same horizontal plane, so that the clamping blocks 20 are uniformly stressed when the pipeline 10 is lifted, and the pipeline 10 can be ensured to be in a vertical state during lifting to a certain extent.

In this embodiment, before step S10, it is further necessary to weld the plurality of clips 20 on the pipe 10, for example, 4 clips 20 may be welded. The fixture blocks 20 are uniformly welded on the pipeline 10 along the circumferential direction of the pipeline 10, so that the fixture blocks 20 are uniformly stressed when the pipeline 10 is lifted, and the pipeline 10 can be ensured to be in a vertical state during lifting to a certain extent.

In step S10, the clamping device 30 may be mounted on the fixture 20 of one of the sections of the pipe 10, such that the clamping device 30 cooperates with the fixture 20 to clamp the section of the pipe 10. The one pipe section 10 may be a first pipe section 11.

In step S20, one of the sections of the pipeline 10 may be hoisted by the hoisting device 40. Specifically, the lifting device 40 is connected with the clamping device 30, and the lifting device 40 and the clamping device 30 are matched to lift one section of the pipeline 10 and control the pipeline 10 to move. For example, two hoisting ropes are connected to the hoisting part 315 of the clamping device 30 by hoisting buckles of the hoisting device 40, and are suspended to a hook of a crane, and the pipeline 10 is hoisted and moved to the wellhead by the crane. Wherein, the lifting rope can be a steel wire rope.

In this embodiment, after the pipeline 10 is hoisted, the perpendicularity of the pipeline 10 also needs to be detected. When the pipe 10 is in a vertical state, the subsequent operation can be performed. Optionally, it may be checked whether the lifting rope is uniformly stressed to determine whether the pipe 10 is in a vertical state. When the lifting rope is uniformly stressed, the pipeline 10 is judged to be in a vertical state, and subsequent operation can be performed. When the lifting rope is unevenly stressed, that is, the pipeline 10 is inclined, the lifting device 40 and/or the clamping device 30 need to be adjusted, and then the pipeline 10 needs to be lifted again until the pipeline 10 is in a vertical state.

Optionally, after the pipeline 10 is hoisted, the pipeline may be stationary for a period of time to check whether the working conditions of the hoisting device 40 and the clamping device 30, such as the hoisting rope, are normal, if there is a problem, the pipeline 10 needs to be put down, and the pipeline is hoisted again after the hoisting device 40 and the clamping device 30 are adjusted.

When it is determined that the pipe 10 is in a vertical state, the pipe 10 is moved to the wellhead and put into the well until the gripping device 30 on the pipe 10 is stuck at the wellhead. Specifically, after the pipeline 10 is hoisted and the pipeline 10 is stable in the air, the travelling crane is moved slowly, the pipeline 10 is moved to a position right above the wellhead, and the hook on the travelling crane is lowered slowly to drop the pipeline 10 into the well until the clamping device 30 on the pipeline 10 is clamped at the wellhead. Wherein, a fixed platform 50 is arranged at the wellhead, and after the clamping device 30 is located on the fixed platform 50, the pipeline 10 can be supported on the fixed platform 50.

After the gripping device 30 on the pipe 10 is stuck at the wellhead, the lifting device 40 is detached from the gripping device 30 on the pipe 10 and the lifting device 40 is connected to the gripping device 30 of the other pipe 10. Wherein the another length of pipe 10 may be a second length of pipe 12.

Next, step S30 is performed to hoist the other pipe 10, such as the second pipe 12, in the same manner as in step S20. The other length of pipe 10 is moved over the wellhead and dropped to interface with the pipe 10 (e.g. the first length of pipe 11) stuck at the wellhead, welding the two lengths of pipe, using the same method as in step 20. Wherein the other section of the pipeline 10 can be lifted, moved and dropped over the pipeline 10 by the lifting device 40.

Specifically, before welding the pipes, it is necessary to test whether the positions of the two sections of pipes are aligned. After the two sections of pipe are aligned, the two sections of pipe are welded. When the positions of the two sections of pipe are misaligned, the position of the pipe 10 located above (for example, the second section of pipe 12) is corrected to be aligned with the pipe 10 located below (for example, the first section of pipe 11). Optionally, the two sections of pipes may be subjected to test alignment, that is, the positions of the two sections of pipes are checked and corrected by using a test tool so that the two sections of pipes are aligned, and welding is performed after the alignment is qualified. Optionally, after the welding is completed, it is also required to check whether the welding is qualified, and after the welding is qualified, the subsequent step S40 is performed.

In step S40, after welding is completed, the pipe (e.g., the second length of pipe 12) located above may be hoisted again to hoist the entire pipe. For example by re-lifting the hook in the lifting means 40 to lift the gripping means 30 attached thereto on the pipe 10 above and thereby the entire pipe. In particular, it is possible to hoist a certain distance, for example 100-200 mm, thereby facilitating the disassembly of the clamping device 30.

After hoisting the pipe 10, the clamping device 30 on the lower pipe 10 (e.g., the first pipe section 11) is removed, wherein the removed clamping device 30 can be clamped on the next pipe section (e.g., the third pipe section). The entire welded pipe is then lowered into the well until the gripping device 30 on the pipe 10 above (e.g., the second length of pipe 12) is snapped to the wellhead. In this embodiment, the gripping device 30 may be dropped onto a fixed platform 50 of the wellhead to prevent the pipe 10 from continuing to fall under the force of gravity.

After the pipeline 10 is supported on the fixed platform 50, the lifting means 40 connected to the clamping means 30 is detached and connected to the clamping means 30 on the next pipeline (for example, the third pipeline) to lift the next pipeline in the same manner as in steps S30 and S40.

And repeating the steps S30 to S40 until all the multi-section pipelines 10 are put into the well, so that the well descending and installation of all the multi-section pipelines 10 can be realized.

In the present embodiment, the number of the required clamping devices 30 is two, and the clamping devices 30 can be designed in different forms according to actual needs.

By adopting the method of the embodiment, the longer pipeline can be divided into a plurality of sections of pipelines, and each section of pipeline is sequentially lifted, welded and placed into the well, so that the lifting and downhole installation of the longer pipeline with large diameter is realized, the operation is convenient, and the occupied space of the long pipeline during lifting is saved. And the method in the embodiment replaces the traditional method of arranging the special lifting lug on each section of pipeline, so that the structure is simple, the operation is easy, the space is saved, the requirement on the external clearance of the pipeline is reduced, and the efficiency of installing the pipeline in the well is improved.

It should also be noted that, in the case of the embodiments of the present invention, features of the embodiments and examples may be combined with each other to obtain a new embodiment without conflict.

The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and the scope of the present invention is subject to the scope of the claims.

Claims

1. A method for installing a pipeline in a well is characterized in that the pipeline is a multi-section pipeline, a plurality of clamping blocks are arranged on each section of pipeline along the circumferential direction of the pipeline, and the clamping blocks are positioned on the same horizontal plane, and the method comprises the following steps:

step S10, installing a clamping device at the fixture block of the pipeline, so that the clamping device and the fixture block are matched to clamp the pipeline;

step S20, hoisting the pipeline by hoisting the clamping device on one section of the pipeline, moving the pipeline to a wellhead and putting the pipeline into the well until the clamping device on the pipeline is clamped at the wellhead;

step S30, hoisting another pipeline, moving the pipeline above the wellhead, dropping the pipeline to be butted with the pipeline clamped at the wellhead, and welding the two pipelines;

step S40, hoisting the pipeline by hoisting the clamping device on the other section of pipeline above, detaching the clamping device on the pipeline below the other section of pipeline, and putting the welded pipeline into the well until the clamping device on the other section of pipeline above is clamped on the wellhead;

2. The method according to claim 1, wherein in step S20, a hoisting device is connected to the clamping device, one of the lengths of pipe is hoisted by the hoisting device in cooperation with the clamping device, and the movement of the pipe is controlled;

after the gripping device on the pipe is stuck at the wellhead, the hoisting device is detached from the gripping device on the pipe and connected to the gripping device of the other section of pipe.

3. The method of claim 1, further comprising:

after the pipeline is hoisted, detecting the verticality of the pipeline;

wherein the pipe is moved to the wellhead when the pipe is in a vertical position.

4. The method of claim 3,

when the pipeline inclines, the pipeline is put down, the lifting device and/or the clamping device are adjusted, and the pipeline is lifted again until the pipeline is in a vertical state.

5. The method of claim 1, further comprising:

before welding the pipelines, testing whether the positions of the two sections of pipelines are aligned;

and welding the two sections of pipelines after the two sections of pipelines are aligned.

6. The method of claim 5,

when the positions of the two sections of pipes are not aligned, the position of the pipe positioned above is corrected to be aligned with the pipe positioned below.

7. The method of claim 1, further comprising:

and the clamping block is welded on the pipeline, and a preset distance is reserved between the clamping block and the end part of the pipeline.

8. The method of any one of claims 1-7, wherein the clamping device comprises:

the clamping device comprises two semi-annular clamping pieces which are oppositely arranged, a space for accommodating the pipeline is defined between the two clamping pieces, and the space is matched with the shape and the size of the pipeline; and

the fasteners are arranged on the opposite side surfaces of the two clamping pieces and are used for connecting and locking the two clamping pieces so as to clamp the pipeline;

the method comprises the following steps: and installing and removing the clamping device on the pipeline through locking and unlocking of the fastener.

9. The method of claim 8, wherein the clamp comprises:

the supporting part is in a semi-annular shape and is matched with the shape and the size of the pipeline;

the connecting parts are arranged at the two ends of the supporting part, and the fasteners are connected to the connecting parts and used for correspondingly connecting and locking the connecting parts at the two ends of the two clamping pieces; each connecting part is also provided with a lifting part, and the lifting parts on the two clamping pieces are correspondingly arranged;

the hoisting device is connected to the hoisting part so as to enable the hoisting device to hoist the clamping device and the pipeline clamped by the clamping device.

10. The method of claim 9, wherein the support part comprises a first support plate and a second support plate, and the connection part is connected between the first support plate and the second support plate;

when the clamping device clamps the pipeline, the clamping block is clamped between the first supporting plate and the second supporting plate, or the clamping block is positioned above the first supporting plate so that the first supporting plate contacts with the lower surface of the clamping block and forms a stress point.

11. A method according to claim 10, wherein at least one reinforcement is further provided between the first and second support plates for reinforcing the support of the support portion to the pipe.

12. An apparatus for downhole installation of a tubular, comprising:

the clamping blocks are arranged along the circumferential direction of the pipeline and are positioned on the same horizontal plane;

the clamping device is matched with the shape and the size of the pipeline, and the clamping device is detachably connected to a clamping block of the pipeline and used for clamping the pipeline;

and the hoisting device is connected with the clamping device and is used for hoisting the clamping device and the pipeline clamped by the clamping device.

13. The apparatus of claim 12, wherein the clamping device comprises:

the pipe clamping device comprises two semi-annular clamping pieces which are oppositely arranged, a space for accommodating the pipe is defined between the two clamping pieces, and the space is matched with the shape and the size of the pipe; and

and the fastening piece is arranged on the opposite side surfaces of the two clamping pieces and is used for connecting and locking the two clamping pieces so as to clamp the pipeline.

14. The apparatus of claim 13, wherein the clamp comprises:

the supporting part is in a semi-annular shape and is matched with the shape and the size of the pipeline, and the supporting part is used for supporting the pipeline by being matched with the clamping block;

and the connecting parts are arranged at the two ends of the supporting part, and the fasteners are connected to the connecting parts and used for correspondingly connecting and locking the connecting parts at the two ends of the clamping piece.

15. The equipment of claim 14, wherein each connecting part is further provided with a lifting part, the lifting parts on the two clamping members are correspondingly arranged, and the lifting parts are used for being connected with the lifting device so that the lifting device can lift the clamping devices and the pipelines clamped by the clamping devices.

16. The apparatus of claim 14, wherein the support portion comprises a first support plate and a second support plate, and the connecting portion is connected between the first support plate and the second support plate.

17. The apparatus according to claim 16, wherein at least one reinforcement is further disposed between the first and second support plates for reinforcing the support of the support portion to the pipe.

18. The apparatus of claim 12,

the fixture blocks are uniformly arranged on the pipeline along the circumferential direction of the pipeline.