Double-pipe tripping-in device for well completion

Abstract

The double-pipe tripping-in device for well completion comprises a branch well sealing plug assembly, a main well sealing plug assembly, a containing shell and a slope part, a window is formed in the portion, below the bottom end of the main well sealing plug assembly, of the containing shell, and the slope part is arranged below the window. The bottom end of the main well sealing plug assembly can make contact with the surface of the inclined face part, the branch well sealing plug assembly comprises a sealing pipe column string and a trigger barrel for fixing the sealing pipe column string, the trigger barrel is connected with the inner surface of the containing shell, a stop block is arranged on the periphery of the trigger barrel, and the stop block can be in extrusion fit with a protrusion on the borehole connector. And the triggering barrel can move, so that the sealing pipe column string can move downwards. According to the invention, the main well hole oil pipe can enter the main well hole, the branch well hole oil pipe can enter the branch well hole, sealing can be realized through insertion after the main well hole oil pipe and the branch well hole oil pipe are put down, sealing parts are convenient to replace, and later well repair and reservoir transformation operation are convenient to implement.

Description

Technical Field

[0001] The invention relates to the technical field of drilling engineering, and in particular to a double-pipe running device for well completion. Background Art

[0002] Branch well technology is a further extension and expansion of horizontal well technology. It can increase the oil leakage area of ​​a single well, effectively tap the potential of remaining oil, increase recovery and improve the effect of oilfield development. The key to branch well technology lies in the connection of each branch wellbore with the main wellbore at the branch point. In the five-level branch well construction technology, casing is lowered into the main wellbore and the branch wellbore, and the connection between the main wellbore and the branch wellbore has mechanical support and sealing capabilities, which can achieve complete interlayer separation and each branch wellbore can be re-entered.

[0003] In order to achieve the sealing of the wellbore connection and the separate exploitation of the main wellbore and the branch wellbore, the usual method is to use the mortise and tenon joints for the wellbore connection and set seals at the joints, which results in a complex overall structure and a small diameter of the wellbore connector, which is not conducive to the later well repair and reservoir transformation operations; moreover, this method of using the wellbore connector's own seal to achieve the window seal cannot be replaced when the seal fails because the wellbore connector cannot be removed. Therefore, improving the reliability of the window seal of the five-level branch well and providing a larger channel for the later well repair and reservoir transformation operations has become a problem that needs to be solved urgently. Summary of the invention

[0004] One object of the present invention is to propose a double-tube running device for completion based on a wall-mounted wellbore connector, which can be automatically guided into position to enable the main wellbore oil pipe to enter the main wellbore and the branch wellbore oil pipe to enter the branch wellbore. After the main wellbore oil pipe and the branch wellbore oil pipe are run into, sealing can be achieved by insertion, which is convenient for replacing sealing components and facilitating the implementation of later well repair and reservoir transformation operations.

[0005] According to the present invention, a double-tube running device for well completion is provided, comprising a branch well sealing plug assembly with a branch oil pipe inside, a main well sealing plug assembly, a housing shell and an inclined portion, the branch well sealing plug assembly and the main well sealing plug assembly are arranged side by side and both are inserted into the housing shell, the housing shell is provided with a window below the bottom end of the main well sealing plug assembly, the inclined portion is arranged below the window, the bottom end of the main well sealing plug assembly can contact the surface of the inclined portion, the branch well sealing plug assembly comprises a sealing pipe string and a trigger cylinder for fixing the sealing pipe string, the trigger cylinder is connected to the inner surface of the housing shell, and has a stopper on its outer periphery, the stopper can be pressed and matched with a protrusion on the wellbore connector to make the trigger cylinder leave the housing shell, and the trigger cylinder can be displaced and make the sealing pipe string descend.

[0006] In a preferred embodiment, the branch well sealing plug assembly also includes a support tube sleeved on the outer surface of the sealing pipe string, the support tube has relatively arranged accommodating holes, the double-tube lowering device for completion also includes a hanging block, the hanging block is arranged in the accommodating hole, the trigger tube is sleeved on the outer surface of the support tube and contacts with one side surface of the hanging block, and the other side surface of the hanging block contacts with the outer surface of the sealing pipe string.

[0007] In a preferred embodiment, an accommodating space is formed between the trigger tube, the end of the support tube, and a portion of the inner surface of the accommodating shell, and the trigger tube moves into the accommodating space after leaving the accommodating shell.

[0008] In a preferred embodiment, the sealed pipe string includes an upper suspension tube, a lower suspension tube and a tubing short section arranged inside the support tube, the lower suspension tube is connected to the lower end of the upper suspension tube, the upper suspension tube is sleeved on the outer surface of the branch oil pipe, the lower end of the branch oil pipe is connected to the tubing short section, the lower suspension tube is sleeved on the outer surface of the tubing short section and connected to the tubing short section, and the surface on the other side of the suspension block is in contact with the lower suspension tube.

[0009] In a preferred embodiment, the suspension block is provided with a corrugated groove on a side close to the lower suspension tube, the outer surface of the lower suspension tube is provided with corrugations matching the corrugated groove, and the corrugated groove abuts against the corrugations provided on the outer surface of the lower suspension tube.

[0010] In a preferred embodiment, the main well sealing plug assembly includes a guide rail cylinder, a guide shoe and a guide member. The guide shoe is sleeved on the outer surface of the guide rail cylinder and is clamped and limited with the guide rail cylinder. A sliding groove is provided on the outer periphery of the guide rail cylinder. The guide shoe is provided with a through hole along its radial direction. The embedded end of the guide member passes through the through hole and enters the sliding groove. The guide member is fixedly connected to the through hole, and the guide member can slide in the sliding groove.

[0011] In a preferred embodiment, the guide shoe is provided with a step along its inner surface, an elastic member is provided between the end surface of the guide rail cylinder and the step, and the elastic member is in a compressed state.

[0012] In a preferred embodiment, the sliding slot is constructed as a slot body formed by connecting an elliptical cylindrical slot portion and a rectangular parallelepiped slot portion, and the guide member can abut against the elliptical cylindrical slot portion, and can slide out of the elliptical cylindrical slot portion and enter the next elliptical cylindrical slot portion through the rectangular parallelepiped slot portion.

[0013] In a preferred embodiment, the guide rail cylinder is provided with a first slot and a first engaging portion at intervals along the circumferential direction, and the guide shoe is provided with a second slot and a second engaging portion at intervals along its circumferential direction, the first slot can cooperate with the second engaging portion, and the first engaging portion can cooperate with the second engaging portion.

[0014] In a preferred embodiment, the bottom end of the containment housing is configured as a spiral tip to align the window with the window of the wellbore connector.

[0015] Effects of the present invention:

[0016] The present invention can enable the main and branch wellbore oil pipes to enter the main and branch wellbore, and the branch wellbore oil pipes to enter the branch wellbore, so that the main and branch wellbore oil pipes and the branch wellbore oil pipes can be simultaneously lowered and automatically guided into position.

[0017] The double-tube running device for completion of the present invention can realize the plug-in seal between the sealing pipe string and the polishing tube in the well by running the sealing pipe string string. Compared with the existing wellbore connection using the form of mortise and tenon plug-in and setting the sealing member at the plug-in position, the present invention can pull out the double-tube running device by lifting the branch well sealing plug assembly and the main well sealing plug assembly, so that the sealing member can be replaced. After being pulled out, the wall-mounted wellbore connector has a large diameter, and can implement large-diameter well repair and later reservoir transformation operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of the double-tube running device for well completion according to the present invention is schematically shown;

[0019] Figure 2 Another overall structural diagram of the double-tube running device for well completion according to the present invention is schematically shown;

[0020] Figure 3 The schematic diagram of the structure of the trigger cylinder of the double-tube running device for well completion according to the present invention is shown;

[0021] Figure 4 A partially enlarged structural diagram of a branch well sealing plug assembly of a double-tube running device for well completion according to the present invention is schematically shown;

[0022] Figure 5 Schematically shows another part of the enlarged structural schematic diagram of the branch well sealing plug assembly of the double-tube running device for well completion according to the present invention;

[0023] Figure 6 The structural diagram of the support cylinder according to the present invention is schematically shown;

[0024] Figure 7The structural diagram of the suspension block according to the present invention is schematically shown;

[0025] Figure 8 The structure diagram of the main well sealing plug assembly of the double-tube running device for well completion according to the present invention is schematically shown;

[0026] Fig. 9 The structure diagram of the guide tube of the double-tube running device for well completion according to the present invention is schematically shown;

[0027] Fig.10 The structural diagram of the guide shoe of the double-tube running device for well completion according to the present invention is schematically shown.

[0028] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily.

[0030] In the description of the present invention, it should be understood that the terms "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0031] In the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] A wellbore connector is provided at the junction of the main wellbore and the branch wellbore. The wellbore connector is provided by wall hanging and has a protrusion thereon. Figures 1 to 3As shown, the double-tube lowering device 100 for completion of the present invention comprises a branch well sealing plug assembly 1, a main well sealing plug assembly 2, a accommodating shell 3 and a sloped portion 4, wherein the branch well sealing plug assembly 1 and the main well sealing plug assembly 2 are arranged side by side and the main bodies of both are penetrated in the accommodating shell 3, the length of the branch well sealing plug assembly 1 is greater than the length of the main well sealing plug assembly 2, the branch well sealing plug assembly 1 and the main well sealing plug assembly 2 are respectively penetrated by a branch oil pipe 14 and a main oil pipe 201 for oil passing, and the branch well sealing plug assembly 1 is connected to the accommodating shell 3.

[0033] The housing 3 is provided with a window 31 below the bottom end of the main well sealing plug assembly 2 along the axial direction of the main well sealing plug assembly 2. A chamfered portion 4 is provided below the window 31. The chamfered portion 4 has an inclined plane, which is provided on the housing 3 through a shoulder inside the housing 3. A through hole is provided inside the chamfered portion 4. The branch oil pipe 14 of the branch well sealing plug assembly 1 passes through the through hole of the chamfered portion 4 and continues to extend downward. In the process of lowering the main well sealing plug assembly 2, the bottom end of the main well sealing plug assembly 2 can contact the inclined surface of the chamfered portion 4 and slide out of the window 31, so as to enter the main wellbore.

[0034] The branch well sealing plug assembly 1 includes a sealing pipe string and a trigger tube 8 for fixing the sealing pipe string. The sealing pipe string is arranged in the accommodating shell 3 and is located below the inclined portion 4. The trigger tube 8 is connected to the inner surface of the accommodating shell 3, and the outer periphery of the trigger tube 8 is provided with a stopper. During the process of lowering the branch well sealing plug assembly 1, the stopper can cooperate with the protrusion on the wellbore connector to make the trigger tube 8 leave the accommodating shell 3, and the trigger tube 8 can be displaced and make the sealing pipe string descend into the branch wellbore.

[0035] The present invention arranges the branch well sealing plug assembly 1 and the main well sealing plug assembly 2 side by side and the two are inserted into the accommodating shell 3, the accommodating shell 3 is provided with a window 31 below the bottom end of the main well sealing plug assembly 2 and the inclined portion 4 is arranged below the window 31, the bottom end of the main well sealing plug assembly 1 can contact the surface of the inclined portion 4, the branch well sealing plug assembly 1 includes a sealing pipe string and a trigger tube 8 for fixing the sealing pipe string, the trigger tube 8 is connected to the inner surface of the accommodating shell 3 and has a stopper 81 on its outer periphery, the stopper 81 can be pressed and matched with the protrusion on the wellbore connector, so that the trigger tube 8 leaves the accommodating shell 3, the trigger tube 8 can be displaced and the sealing pipe string descends into the branch wellbore, and the branch well sealing plug assembly 1 is pressed down so that the branch well sealing plug assembly During the process of entering the well and moving downward, the stopper 81 on the outer surface of the trigger cylinder 8 can be squeezed by the protrusion set on the wellbore connector, so that the trigger cylinder 8 is subjected to force as a whole, and then the connection between the trigger cylinder 8 and the inner surface of the accommodating shell 3 can be cut off, so that the trigger cylinder 8 leaves the accommodating shell 3 and shifts, and the sealing pipe string can continue to descend into the polishing cylinder in the branch wellbore for mechanical sealing; when the main well sealing plug assembly 1 is lowered, the bottom end of the main well sealing plug assembly 1 can move and contact the inclined surface of the inclined body 4 after passing through the window 31, so that it can slide out of the window 31 and enter the main branch wellbore, so that the main branch wellbore oil pipe enters the main branch wellbore, and the branch wellbore oil pipe enters the branch wellbore, so that the main branch wellbore oil pipe and the branch wellbore oil pipe are lowered into place at the same time and automatically guided into place.

[0036] In addition, the double-tube running device 100 for completion of the present invention can realize the plug-in seal between the sealing pipe string and the polishing tube in the well by running the sealing pipe string. Compared with the existing wellbore connection using the form of mortise and tenon plug-in and setting a seal at the plug-in, the present invention can lift the double-tube running device 100 by lifting the branch well sealing plug assembly 1 and the main well sealing plug assembly 2, so that the sealing components can be replaced. After being pulled out, the wall-mounted wellbore connector has a large diameter, and can implement large-diameter well repair and later reservoir transformation operations.

[0037] like Figures 4 to 7 As shown, in one or more embodiments, the branch well sealing plug assembly 1 also includes a support tube 5 sleeved on the outer surface of the sealing pipe string, the support tube 5 has a relatively arranged accommodating hole 51, and the double-tube running device 100 for completion also includes a hanging block 13, the hanging block 13 is arranged in the said accommodating hole 51, the trigger tube 8 is sleeved on the outer surface of the support tube 5 and contacts with one side surface of the hanging block 13, and the other side surface of the hanging block 13 contacts with the outer surface of the sealing pipe string.

[0038] Specifically, the branch well sealing plug assembly 1 also includes a support tube 5 sleeved on the outer surface of the branch oil pipe 14, the support tube 5 is sleeved on the outer surface of the sealing pipe string, the support tube 5 is constructed as a cylindrical body and the outer diameter of the first end is greater than the outer diameter of the second end, the outer surface of the support tube 5 is connected to the inner surface of the accommodating shell 3 through a first fixing part 10, optionally, the first fixing part 10 can be a pin.

[0039] The sealed pipe string includes an upper suspension tube 6 and a lower suspension tube 7 and a tubing nipple 9 arranged inside the support tube 5, the lower suspension tube 7 is connected to the lower end of the upper suspension tube 6, the upper suspension tube 6 is sleeved on the outer surface of the branch tubing 14, the lower end of the branch tubing 14 is connected to the tubing nipple 9, the lower suspension tube 7 is sleeved on the outer surface of the tubing nipple 9 and is connected to the tubing nipple 9 through a second fixing portion 12, and the second fixing portion 12 can be a shear nail. Optionally, the upper suspension tube 6 is connected to the lower suspension tube 7 by threads.

[0040] The support tube 5 has a relatively arranged accommodation hole 51 near the second end, and the accommodation hole 51 is optionally configured to be rectangular. The suspension block 13 is arranged in the accommodation hole 51 and abuts against the outer surface of the lower suspension tube 7, which can prevent the support tube 5 and the lower suspension tube 7 from moving relative to each other on the one hand, and facilitate the separation of the support tube 5 and the lower suspension tube 7 on the other hand.

[0041] In one or more embodiments, the suspension block 13 is provided with a corrugated groove on one side close to the lower suspension tube 7, and the outer surface of the lower suspension tube 7 is provided with corrugations matching the corrugated groove, and the corrugated groove of the suspension block 13 can be abutted and matched with the corrugations provided on the outer surface of the lower suspension tube 7.

[0042] The trigger tube 8 is sleeved on the outer surface of the second end of the support tube 5. The trigger tube 8 is coaxial with the support tube 5 and is configured as a cylindrical body. The outer surface of the trigger tube 8 is connected to the accommodating shell 3 through a third fixing portion 11. Optionally, the third fixing portion 11 can be a shear nail. The hanging block 13 abuts against the trigger tube 8 on the surface of the side away from the lower hanging tube 7, and the inner surface of the trigger tube 8 and the outer surface of the lower hanging tube 7 jointly limit the hanging block 13. An accommodating space s is formed between the trigger tube 8, the first end of the support tube 5 and a part of the inner surface of the accommodating shell 3, and the trigger tube 8 can move into the accommodating space s after leaving the accommodating shell 3.

[0043] During the process of the branch well sealing plug assembly 1 entering the well and moving downward, the stopper 81 on the outer surface of the trigger tube 8 can be squeezed by the protrusion set on the wellbore connector, so that the trigger tube 8 is subjected to force as a whole, and then the third fixing part 11 can be cut off, so that the trigger tube 8 leaves the accommodating shell 3 and moves into the accommodating space s. Since the inner surface of the trigger tube 8 and the outer surface of the lower suspension tube 7 jointly limit the suspension block 13, after the trigger tube 8 moves to the accommodating space s, the oil pipe short section 9 applies an extrusion force to the lower suspension tube 7, and then the suspension block 13 is radially squeezed outward, so that the oil pipe short section 9 and the upper suspension tube 6 and the lower suspension tube 7 leave the support tube 5, and continue to descend to the polishing tube in the branch wellbore for mechanical sealing.

[0044] like Figures 8 to 10 As shown, the main well sealing plug assembly 2 includes a guide rail cylinder 203, a guide shoe 205 and a guide member 206. The guide shoe 205 is sleeved on the outer surface of the guide rail cylinder 203 and is clamped and limited with the guide rail cylinder 203. A sliding groove 2033 is provided on the outer periphery of the guide rail cylinder 203. The guide shoe 205 is provided with a through hole 2051 along its radial direction. The embedded end of the guide member 206 passes through the through hole 2051 and enters the sliding groove 2033. The guide member 206 is fixedly connected to the through hole 2051, and the guide member 206 can slide in the sliding groove 2033.

[0045] Specifically, the main oil pipe 201 is connected to the first end of the guide rail cylinder 203, and optionally, the main oil pipe 201 is connected to the guide rail cylinder 203 by threads. The guide rail cylinder 203 is configured as a cylindrical body, and the guide rail cylinder 203 is provided with a first slot 2031 and a first engaging portion 2032 at intervals along its circumferential direction near its first end. The guide shoe 205 is configured as a cylindrical body and is provided with a second slot 2051 and a second engaging portion 2052 at intervals along its circumferential direction at its first end. The first slot 2031 can cooperate with the second engaging portion 2052, and at the same time, the first engaging portion 2032 can cooperate with the second engaging portion 2052, so as to play a limiting role. The guide shoe 205 is sleeved on the outer surface of the guide rail cylinder 203, and the guide shoe 205 is provided with a step along its inner surface. An elastic member 204 is provided between the end surface of the second end of the guide rail cylinder 203 and the step. After the main well sealing plug assembly 2 is assembled, the elastic member 204 is always in a compressed state. The elastic member 204 can be an elastic member.

[0046] The guide rail cylinder 203 is provided with a sliding slot 2033 on the outer periphery near the second end. The sliding slot 2033 is configured as a slot body formed by connecting an elliptical cylinder slot portion with a rectangular parallelepiped slot portion. The guide shoe 205 is provided with a through hole 2051 along its radial direction. The embedded end of the guide member 206 passes through the through hole 2051 and enters the sliding slot 2033, abuts against the elliptical cylinder slot portion, and the guide member 206 is fixedly connected with the through hole 2051, so that the guide shoe 205 and the guide member 206 are fixed, and the guide member 206 can slide out of the elliptical cylinder slot portion of the sliding slot 2033 and enter the next elliptical cylinder slot portion through the rectangular parallelepiped slot portion connected with the elliptical cylinder slot portion, so that the guide shoe 205 rotates relative to the guide rail cylinder 203. The guide member 206 can be a screw. The elastic member 204 is in a compressed state, exerting elastic force on the guide rail cylinder 203 and the guide shoe 205 , so that after the guide shoe 205 rotates relative to the guide rail cylinder 203 , the guide member 206 can stably abut against the elliptical cylindrical slot portion of the sliding slot 2033 .

[0047] In one or more embodiments, the second end of the guide shoe 205 is configured as a flat head structure, which can effectively prevent the guide shoe 205 from encountering resistance.

[0048] After the main well sealing plug assembly 2 is lowered, when the guide shoe 205 encounters resistance, the elastic member 204 is compressed, and the guide shoe 205 can move upward, thereby driving the guide member 206 to move in the sliding slot 2033, thereby driving the guide shoe 205 to rotate, thereby avoiding obstacles and allowing the main well sealing plug assembly 2 to continue to be lowered into the polishing cylinder in the main wellbore for mechanical sealing.

[0049] In one or more embodiments, the main well sealing plug assembly 2 further includes a sealing module 202, and the sealing module 202 ensures that the main well sealing plug assembly 2 forms a seal with the main and branch wellbores.

[0050] In one or more embodiments, the bottom end of the containment housing 3 is configured as a spiral tip, which can align the window 31 of the containment housing 3 with the window of the wellbore connector (ie, the inlet of the branch wellbore).

[0051] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A double-tube running device for well completion, comprising a branch well sealing plug assembly with a branch oil pipe inside, a main well sealing plug assembly, a housing and a sloped portion, The branch well sealing plug assembly and the main well sealing plug assembly are arranged side by side and both are inserted into the accommodating shell. The accommodating shell is provided with a window below the bottom end of the main well sealing plug assembly. The inclined portion is arranged below the window. The bottom end of the main well sealing plug assembly can contact the surface of the inclined portion. The branch well sealing plug assembly includes a sealing pipe string and a trigger cylinder for fixing the sealing pipe string. The trigger cylinder is connected to the inner surface of the accommodating shell and has a stopper on its outer periphery. The stopper can be squeezed and matched with the protrusion on the wellbore connector to make the trigger cylinder leave the accommodating shell. The trigger cylinder can be displaced and make the sealing pipe string descend.

2. The double-tube running device for well completion according to claim 1, characterized in that: The branch well sealing plug assembly also includes a support tube sleeved on the outer surface of the sealing pipe string, the support tube has relatively arranged accommodating holes, the double-tube running device for completion also includes a hanging block, the hanging block is arranged in the accommodating hole, the trigger tube is sleeved on the outer surface of the support tube and contacts with one side surface of the hanging block, and the other side surface of the hanging block contacts with the outer surface of the sealing pipe string.

3. The double-tube running device for well completion according to claim 2, characterized in that: An accommodating space is formed between the trigger tube, the end of the support tube and a portion of the inner surface of the accommodating shell. After leaving the accommodating shell, the trigger tube moves into the accommodating space.

4. The double-tube running device for well completion according to claim 2, characterized in that: The sealed pipe string includes an upper suspension tube, a lower suspension tube and a tubing short section which are arranged inside the support tube, the lower suspension tube is connected to the lower end of the upper suspension tube, the upper suspension tube is sleeved on the outer surface of the branch oil pipe, the lower end of the branch oil pipe is connected to the tubing short section, the lower suspension tube is sleeved on the outer surface of the tubing short section and connected to the tubing short section, and the surface on the other side of the suspension block is in contact with the lower suspension tube.

5. The double-tube running device for well completion according to claim 4, characterized in that: The suspension block is provided with a corrugated groove on one side close to the lower suspension tube, the outer surface of the lower suspension tube is provided with corrugations matching the corrugated groove, and the corrugated groove abuts against the corrugations provided on the outer surface of the lower suspension tube.

6. The double-tube running device for well completion according to claim 1, characterized in that: The main well sealing plug assembly includes a guide rail cylinder, a guide shoe and a guide member. The guide shoe is sleeved on the outer surface of the guide rail cylinder and is clamped and limited with the guide rail cylinder. A sliding groove is provided on the outer periphery of the guide rail cylinder. The guide shoe is provided with a through hole along its radial direction. The embedded end of the guide member passes through the through hole and enters the sliding groove. The guide member is fixedly connected to the through hole, and the guide member can slide in the sliding groove.

7. The double-tube running device for well completion according to claim 6, characterized in that: The guide shoe is provided with a step along its inner surface, an elastic member is provided between the end surface of the guide rail cylinder and the step, and the elastic member is in a compressed state.

8. The double-tube running device for well completion according to claim 7, characterized in that: The sliding slot is constructed as a slot body formed by connecting an elliptical cylindrical slot portion and a rectangular parallelepiped slot portion. The guide member can abut against the elliptical cylindrical slot portion, and can slide out of the elliptical cylindrical slot portion and enter the next elliptical cylindrical slot portion through the rectangular parallelepiped slot portion.

9. The double-tube running device for well completion according to claim 6, characterized in that: The guide rail cylinder is provided with a first slot and a first engaging portion at intervals along the circumferential direction, and the guide shoe is provided with a second slot and a second engaging portion at intervals along its circumferential direction. The first slot can cooperate with the second engaging portion, and the first engaging portion can cooperate with the second engaging portion.

10. The double-tube running device for well completion according to claim 1, characterized in that: The bottom end of the containment housing is configured as a spiral tip to align the window with the window of the wellbore connector.

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