Double-pipe guiding tool

Abstract

The invention belongs to the technical field of petroleum drilling, and particularly relates to a double-pipe guiding tool. The double-pipe guiding tool comprises a guiding body used for entering a borehole connector, a first channel and a second channel are arranged in the guiding body, the first channel is communicated with the two axial ends of the guiding body and points to a first branch borehole, and the second channel is communicated with the upper end and the side wall of the guiding body; the guide main body points to a second branch well hole, a guide sleeve is arranged at the upper end of the guide main body, and the guide sleeve is constructed to be capable of being matched with the well hole connector for orientation; a locking mechanism used for locking the first branch oil pipe and / or the second branch oil pipe is arranged on the side wall of the guiding body, and after the guiding body enters the borehole connector, the borehole connector can trigger the locking mechanism to lock the first branch oil pipe and / or the second branch oil pipe. And the locking mechanism unlocks the first branch oil pipe and / or the second branch oil pipe.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling, and in particular relates to a double-tube guiding tool. Background Art

[0002] As an extension and development of horizontal well technology, branch well technology can increase the oil leakage area of ​​a single well, effectively tap the potential of remaining oil, increase recovery rate, and improve the effect of oil field development. It has become an advanced technology for oil and gas field development. The wellbore connection of the five-level branch well technology has good sealing performance and is more adaptable than the four-level branch well technology. It provides an effective means for the continuous, economical and effective development of reservoirs that are prone to water and sand, layered reservoirs, marginal reservoirs, fault block reservoirs and mid- and late-stage reservoirs. Five-level branch wells often use a double-tube completion method to achieve the sealing of the wellbore connection part based on the four-level branch well system. The key technology lies in how to make the main wellbore production string and the branch wellbore production string enter the corresponding main wellbore and branch wellbore at the same time.

[0003] Chinese patent document CN114458221A discloses a double-tube sealing tool and a sealing method thereof, wherein an elastic claw is arranged on the upper outer wall of the guide, a "ladder"-shaped semicircular window is provided on the middle side wall of the guide, the tail end of the guide inclined iron is inserted into the guide below the "ladder"-shaped semicircular window, a half-moon ring is arranged in the lower part of the guide, the middle and lower outer wall of the half-moon ring forms a reduced diameter section, an annular space is formed between the outer wall of the reduced diameter section and the inner wall of the guide, a shear sleeve is arranged in the annular space, the shear sleeve is connected to the guide and the half-moon ring respectively, a locking block hole is provided on the lower inner wall of the half-moon ring, the locking block is arranged in the locking block hole, a positioning sleeve is installed in the middle of the inner wall of the half-moon ring, a flushing pipe extends into the guide from the head end of the guide, and the tail end of the flushing pipe is connected to the head end of the positioning sleeve. The double-tube sealing tool can realize that the sub-production tool with complete hydraulic sealing enters the main and branch wellbores at the same time to meet the main and branch wellbore sub-production and pressure integrity.

[0004] The above-mentioned double-tube sealing tool integrates two production tubing strings in a tubular shell. The two production tubing strings are arranged side by side in the upper part of the shell, and a production tubing string extends out along the center line direction of the shell in the lower part of the shell. The disadvantages of this solution are: when the two tubing strings are descending at the same time, the two tubing strings will be squeezed, resulting in poor descending and encountering obstacles; one of the tubing strings is in a suspended state in the shell and has no mechanical guiding components, so there is a risk of the tubing string deviating from the direction during the descending process. Summary of the invention

[0005] In view of the above-mentioned technical problems, the present invention aims to provide a double-tube guiding tool, which can solve at least one problem in the background technology.

[0006] According to the present invention, there is provided a double-tube guiding tool, comprising:

[0007] A guide body, in which a first channel and a second channel are arranged,

[0008] The first channel communicates with the two axial ends of the guide body and points to the first branch wellbore.

[0009] The second channel communicates with the upper end and the side wall of the guide body and points to the second branch wellbore.

[0010] A guide sleeve for orientation is arranged on the outer wall of the guide body;

[0011] A locking mechanism for locking the first branch oil pipe and / or the second branch oil pipe is arranged on the side wall of the guide body. After the guide body is put into place in the well, the locking mechanism releases the lock on the first branch oil pipe and / or the second branch oil pipe.

[0012] In a preferred embodiment, a first guide profile is provided on the guide sleeve.

[0013] In a preferred embodiment, the locking mechanism comprises:

[0014] A trigger plate, the trigger plate being slidably arranged on the outer wall of the guide body along the axial direction;

[0015] A suspension block is radially slidably arranged on the outer wall of the guide body.

[0016] In the locked state, the trigger plate radially abuts against the outer wall of the hanging block, so that the inner end of the hanging block locks the first branch oil pipe and / or the second branch oil pipe. When the guide body is in place, the trigger plate moves and no longer abuts against the hanging block, thereby unlocking the hanging block.

[0017] In a preferred embodiment, a U-shaped groove is provided on the side wall of the guide sleeve, the U-shaped groove is located at the highest point of the first guide section, the locking mechanism corresponds to the position of the U-shaped groove, and the protrusion is provided at the highest point of the second guide section.

[0018] In a preferred embodiment, the trigger plate comprises an arc plate axially slidably arranged on the outer wall of the guide body, a cushion block is fixedly arranged on the outer wall of the arc plate, and when the guide body is in place in the well, the cushion block is pushed upward by the downhole tool.

[0019] In a preferred embodiment, a through hole matching the shape of the suspension block is provided on the arc plate, and when the arc plate moves until the through hole is aligned with the suspension block, the arc plate no longer abuts against the suspension block, thereby releasing the lock of the suspension block.

[0020] In a preferred embodiment, an arc-shaped groove is provided on the outer wall of the guide body, the arc plate is axially slidably arranged in the arc-shaped groove, the cushion block is located outside the arc-shaped groove, and a fan-shaped groove for setting the suspension block is provided in the arc-shaped groove.

[0021] In a preferred embodiment, the radial inner aperture of the fan-shaped groove is smaller than the radial outer aperture.

[0022] In a preferred embodiment, the central axes of the first channel, the second channel and the guide body are all located on the same plane.

[0023] In a preferred embodiment, the guide body includes an upper joint and a lower joint that are coaxially fixedly connected, the central axes of the first channel and the second channel are parallel to the central axis of the upper joint, and the central axes of the first channel and the second channel are inclined relative to the central axis of the lower joint.

[0024] Compared with the prior art, the advantages of the present application are as follows.

[0025] The present invention arranges a first channel and a second channel inside the guide body, and respectively places a first branch oil pipe and a second branch oil pipe, thereby preventing the two oil pipes from squeezing each other and allowing the oil pipes to descend smoothly.

[0026] The guide sleeve of the present invention can cooperate with the wellbore connector, so that the guide body can be automatically oriented after entering the wellbore connector, so that the lower ends of the first channel and the second channel are respectively aligned with the first branch wellbore and the second branch wellbore.

[0027] In addition, the locking mechanism of the present invention can fix the first branch oil pipe and the second branch oil pipe to the guide body during the well entry process, so as to facilitate the well entry together. After the guide body enters the wellbore connector, the locking mechanism can be unlocked by continuing to apply pressure, so that the first branch oil pipe and the second branch oil pipe enter the first branch wellbore and the second branch wellbore respectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention will be described below with reference to the accompanying drawings.

[0029] Figure 1 A schematic diagram of an embodiment of a branch well;

[0030] Figure 2a is a schematic diagram of an embodiment of a wellbore connector;

[0031] Figure 2b for Figure 2a Schematic diagram of the cross-sectional structure in the AA direction;

[0032] Figure 2c for Figure 2b A schematic diagram of a top view structure;

[0033] Figure 3 This is a schematic diagram of the structure of the dual-tube steering tool after it is put into the well;

[0034] Figure 4a It is a schematic diagram of the connection structure of the double-tube guide tool;

[0035] Figure 4b for Figure 4a Schematic diagram of the cross-sectional structure in the AA direction;

[0036] Figure 4c for Figure 4b Schematic diagram of the left view structure;

[0037] Figure 5 for Figure 4b An enlarged schematic diagram of part B in FIG.

[0038] Figure 6a is a schematic diagram of the structure of the upper joint;

[0039] Figure 6b for Figure 6a A schematic diagram of the cross-sectional structure of the AA portion;

[0040] Figure 7a is a cross-sectional schematic diagram of the guide sleeve;

[0041] Figure 7b for Figure 7a Schematic diagram of the left view structure;

[0042] Figure 8 It is a structural diagram of the trigger board;

[0043] Fig. 9 This is a schematic diagram of the connection between the upper joint and the branch oil pipe.

[0044] In the figure: 1, production packer; 2, first branch wellbore flexible joint; 3, second branch wellbore flexible joint; 4, double-tube guide tool; 5, second branch wellbore sealing plug; 6, second branch wellbore anchoring seal cylinder; 8, lower hanger; 9, oil pipe; 10, rotatable tee joint; 11, main casing; 12, upper hanger; 13, second branch wellbore; 14, first branch wellbore; 15, wellbore connector; 16, cement ring; 17, first branch wellbore sealing plug; 171, reduced diameter; 19, first branch wellbore anchoring seal cylinder; 20, first branch wellbore casing string; 21, first branch wellbore; 22, second branch wellbore casing Pipe string; 23, second branch wellbore; 151, protrusion; 152, second guide section; 153, front end of wellbore connector; 154, opening; 155, end of wellbore connector; 40, guide body; 41, upper joint; 42, guide sleeve; 43, upper second channel; 44, lower second channel; 45, lower joint; 46, lower first channel; 47, hanging block; 480, locking mechanism; 48, trigger plate; 49, upper first channel; 411, arc groove; 412, fan-shaped groove; 421, first guide section; 422, U-shaped groove; 423, side through hole; 481, arc plate; 482, pad; 483, rectangular through hole.

[0045] 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

[0046] The present invention will be described below with reference to the accompanying drawings.

[0047] It should be noted that, in the present application, the direction close to the wellhead after the dual-tube guiding tool 4 according to the present invention enters the well is described as "up", "front" or similar terms, and the direction away from the wellhead is described as "down", "back" or similar terms.

[0048] Figure 1 The structure of an embodiment of a branch well is shown. Figure 1As shown, the well includes a second branch wellbore 23 and a first branch wellbore 21, and the central axis of the first branch wellbore 21 is inclined with the central axis of the second branch wellbore 23. In this embodiment, the second branch wellbore 23 is a main wellbore, a main casing 11 is arranged inside the vertical section of the second branch wellbore 23, a second branch wellbore casing string 22 is arranged in the horizontal section of the second branch wellbore 23, and the front end of the second branch wellbore casing string 22 is connected to the main casing 11 through a lower hanger 8. A first branch wellbore casing string 20 is arranged in the first branch wellbore 21. Cement rings 16 are arranged on the outer walls of the second branch wellbore casing string 22 and the first branch wellbore casing string 20. A wellbore connector 15 is arranged in the first branch wellbore 21, and the front end of the wellbore connector 15 is connected to the main casing 11 through an upper hanger 12.

[0049] Figure 2a to Figure 2c The structure of the wellbore connector 15 is shown. The front end 153 of the wellbore connector is connected to the main casing 11 through the upper hanger 12, and the end 155 of the wellbore connector is connected to the first branch wellbore casing string 20. An opening 154 is provided in the middle of the wellbore connector 15. The opening 154 is connected to the inner cavity of the wellbore connector 15. After the wellbore connector 15 is installed into the first branch wellbore 21, the opening 154 of the wellbore connector 15 is connected to the second branch wellbore 23. A second guide section 152 is provided on the inner side of the upper part of the wellbore connector 15. In this embodiment, the second guide section 152 is provided from the inside of the wellbore connector 15. Figure 2a From the perspective of the second guide section 152, the second guide section 152 is set to a symmetrical structure. Figure 2b From the perspective of the second guide section 152 , a curve shape is provided, a highest point is provided at the front end of the second guide section 152 , and a lowest point is provided at the rear end of the second guide section 152 . The second guide section 152 is used to orient the double-tube guide tool 4 .

[0050] According to the present invention, a protrusion 151 is further provided on the inner side of the upper portion of the wellbore connector 15. In a specific embodiment, the protrusion 151 is provided at the highest point of the second guide profile 152.

[0051] Figure 4a to Figure 4c The structure of the double-tube guide tool 4 according to the present invention is shown. The double-tube guide tool 4 includes a guide body 40, a guide sleeve 42 and a locking mechanism 480.

[0052] In a specific embodiment, the guide body 40 includes an upper joint 41 and a lower joint 45 that are coaxially fixedly connected. In this embodiment, the upper joint 41 and the lower joint 45 are connected together by welding.

[0053] An upper first channel 49 and an upper second channel 43 are provided in the upper joint 41 . The upper first channel 49 and the upper second channel 43 are connected to both axial ends of the upper joint 41 . The central axes of the upper first channel 49 and the upper second channel 43 are parallel to the central axis of the upper joint 41 .

[0054] A lower first passage 46 and a lower second passage 44 are provided in the lower joint 45 .

[0055] The upper end of the lower first channel 46 is connected to the upper first channel 49 to form the first channel of the guide body 40. The lower end of the lower first channel 46 is connected to the lower end of the lower joint 45, thereby connecting to the first branch wellbore 21.

[0056] The upper end of the lower second channel 44 is in communication with the upper second channel 43 to form the second channel of the guide body 40. The lower end of the lower second channel 44 is in communication with the side wall of the lower joint 45, thereby communicating with the second branch wellbore 23.

[0057] In a specific embodiment, the first channel and the second channel are both configured as cylindrical structures, which are adapted to the size of the oil pipe.

[0058] In a preferred embodiment, the lower joint 45 is configured as a three-section columnar structure, that is, the lower joint 45 is divided into three parts from top to bottom, the upper part and the middle part of the lower joint 45 are configured as cylindrical shapes, and the lower part of the lower joint 45 is configured as a truncated cone shape. The upper diameter of the lower joint 45 is greater than the middle diameter, and the upper end diameter of the lower joint 45 is equal to the middle diameter. The lower end of the lower second channel 44 is connected to the middle side wall of the lower joint 45.

[0059] In a preferred embodiment, the central axes of the first channel, the second channel and the guide body 40 are all located on the same plane. The central axis of the lower first channel 46 and the central axis of the lower joint 45 are at an angle of 1° to 2°. The central axis of the lower second channel 44 and the central axis of the lower joint 45 are at an angle of 2° to 5°.

[0060] The guide sleeve 42 is fixedly sleeved on the upper outer side of the upper joint 41. In a specific embodiment, the guide sleeve 42 is sleeved on the upper joint 41 by welding. The guide sleeve 42 is configured to be compatible with the second guide profile 152 of the wellbore connector 15, so as to achieve orientation. When the guide body 40 and the guide sleeve 42 enter the wellbore connector 15, the second guide profile 152 can guide the guide body 40 and the guide sleeve 42 to rotate, so that the lower second channel 44 in the guide body 40 can be connected to the second branch wellbore 23.

[0061] In a specific embodiment, in combination Figure 4a , Figure 4b , Figure 4c , Figure 7aand Figure 7b As shown, a first guide section 421 is provided at the lower end of the guide sleeve 42, and the shape of the first guide section 421 matches the shape of the second guide section 152. When the double-tube guide tool 4 enters the wellbore connector 15, the first guide section 421 of the guide sleeve 42 can rotate under the guidance of the second guide section 152 until the lowest point of the first guide section 421 reaches the lowest point of the second guide section 152. At this time, the lower port of the lower second channel 44 in the double-tube guide tool 4 is aligned with the opening 154 of the wellbore connector 15.

[0062] According to the present invention, the locking mechanism 480 is disposed on the side wall of the guide body 40 and is used to lock the first branch oil pipe 14 and / or the second branch oil pipe 13. Fig. 9 After the guide body 40 enters the wellbore connector 15 , the wellbore connector 15 can trigger the locking mechanism 480 , so that the locking mechanism 480 releases the locking of the first branch oil pipe 14 and / or the second branch oil pipe 13 .

[0063] In a specific embodiment, Figures 5 to 8 As shown, the locking mechanism 480 includes a trigger plate 48 and a suspension block 47 .

[0064] The trigger plate 48 is axially slidably arranged on the outer wall of the guide body 40, and the suspension block 47 is radially slidably arranged on the outer wall of the guide body 40. The radial inner side of the suspension block 47 can pass through the outer wall of the guide body 40 and can be connected with the upper second channel 43 and / or the upper first channel 49. In the present embodiment, the suspension block 47 is connected with the upper first channel 49.

[0065] In the locked state, the trigger plate 48 radially abuts against the outer wall of the hanging block 47, so that the radial inner side of the hanging block 47 is located inside the upper first channel 49, so that the inner end of the hanging block 47 can abut against the outer wall of the first branch oil pipe 14 in the first channel, and the first branch oil pipe 14 is fixed relative to the guide body 40. In the locked state, the second branch oil pipe 13 and the first branch oil pipe 14 can be fixed relative to the guide body 40, so that they can be put into the well together, ensuring a smooth well entry process.

[0066] A protrusion 151 is provided on the wellbore connector 15. When the guide body 40 moves downward relative to the wellbore connector 15, the protrusion 151 can push the trigger plate 48 to move, so that the trigger plate 48 is no longer in contact with the suspension block 47, and no longer abuts against the suspension block 47, so that the suspension block 47 is unlocked. After unlocking, the first branch oil pipe 14 and the second branch oil pipe 13 can continue to move downward relative to the guide body 40 of the dual-tube guide tool 4, and the first branch oil pipe 14 moves along the lower first channel 46 and finally enters the first branch wellbore 21. At the same time, the second branch oil pipe moves along the lower second channel 44 and finally enters the second branch wellbore 23.

[0067] According to the present invention, the position of the locking mechanism 180 corresponds to the position of the highest point of the first guide section 421 of the guide sleeve 42. A U-shaped groove 422 is provided on the side wall of the guide sleeve 42, and the U-shaped groove 422 is located at the highest point of the first guide section 421. Specifically, the guide sleeve 42 is a tubular structure, and two guide sections symmetrical about the plane where the axis of the guide sleeve 42 is located are provided at the lower end to form the first guide section 421. A U-shaped groove 422 is provided at the intersection of the upper ends of the two guide sections, thereby providing space for the locking mechanism 180.

[0068] According to the present invention, a plurality of side through holes 423 are circumferentially arranged on the side wall of the guide sleeve 42. The side through holes 423 are composed of a rectangular through hole and semicircular through holes arranged at both ends of the rectangular through hole.

[0069] In a specific embodiment, Figure 8 As shown, the trigger plate 48 includes an arc plate 481 axially slidably arranged on the outer wall of the guide body 40, and a cushion block 482 is fixedly arranged on the outer wall of the arc plate 481. When the guide body 40 moves downward relative to the wellbore connector 15, the protrusion 151 can push the cushion block 482 to move upward, thereby causing the arc plate 481 to move upward.

[0070] In this embodiment, the cushion block 482 is fixed to the arc plate 481 by welding.

[0071] Furthermore, a rectangular through hole 483 matching the shape of the hanging block 47 is provided on the circular arc plate 481, and the size of the rectangular through hole 483 is larger than the size of the hanging block 47, so that the hanging block 47 can pass through the rectangular through hole 483. When the circular arc plate 481 moves until the through hole is aligned with the hanging block 47, the circular arc plate 481 no longer abuts against the hanging block 47, thereby releasing the lock of the hanging block 47.

[0072] Figure 5 , Figure 6a and Figure 6bAs shown, an arc groove 411 is provided on the outer wall of the upper joint 41 of the guide body 40, and an arc plate 481 is axially slidably provided in the arc groove 411. A cushion block 482 is located outside the arc groove 411. A fan-shaped groove 412 for arranging the suspension block 47 is provided in the arc groove 411, and the fan-shaped groove 412 is communicated with the upper first channel 49 of the upper joint 41. After the suspension block 47 is installed into the fan-shaped groove 412, the arc plate 481 is installed in the arc groove 411. At this time, the outer wall of the arc plate 481 is flush with the outer wall of the upper joint 41 of the guide body 40, and the cushion block 482 radially protrudes from the outer wall of the upper joint 41, so that the protrusion 151 of the wellbore connector 15 can push the cushion block 482. In the locked state, the inner wall of the arc plate 481 abuts against the suspension block 47 to prevent the suspension block 47 from moving radially outward. In the unlocked state, the arc plate 481 moves upward, so that the rectangular through hole 483 moves to a position corresponding to the hanging block 47, and the hanging block 47 can move radially outward.

[0073] In a preferred embodiment, the radial inner diameter of the fan-shaped groove 412 is smaller than the radial outer diameter, and accordingly, the radial inner dimension of the hanging block 47 is smaller than the radial outer dimension, thereby preventing the hanging block 47 from falling radially into the interior of the guide body 40.

[0074] Figure 1 The branch well structure shown can be regarded as a four-level branch well system. The dual-tube guiding tool 4 of the present invention is used to send two oil pipes into two branch wells respectively, and it is upgraded to a five-level branch well system. Figure 3 The specific process is as follows.

[0075] Step 1: On the ground, assemble the production packer 1, the oil pipe 9, the rotatable tee joint 10, the first branch wellbore flexible joint 2, the second branch wellbore flexible joint 3, the second branch oil pipe 13 and the first branch oil pipe 14 according to the following steps: Figure 3 In the structural connection shown, the first branch wellbore sealing plug 17 is located at the end of the first branch oil pipe 14 , and the second branch wellbore sealing plug 5 is located at the end of the second branch oil pipe 13 .

[0076] Step 2: If Fig. 9 As shown, the dual-tube guiding tool 4 is suspended at the lower ends of the first branch oil pipe 14 and the second branch oil pipe 13. Specifically, the first branch oil pipe 14 and the second branch oil pipe 13 enter the first channel and the second channel respectively, and the hanging block 47 holds the necking part 171 of the upper part of the first branch wellbore sealing plug 17, so that the dual-tube guiding tool 4 is suspended on the first branch wellbore sealing plug 17, and the second branch wellbore sealing plug 5 is located in the second channel of the dual-tube guiding tool 4.

[0077] Step 3: Lower tool. After the double-tube guiding tool 4 is lowered into the wellbore connector 15, the first guiding section 421 of the guiding sleeve 42 contacts the second guiding section 152 of the wellbore connector 15. A certain drilling pressure is applied and the double-tube guiding tool 4 rotates along the guiding section, so that the first branch wellbore sealing plug 17 is aligned with the first branch wellbore 21, and the second branch wellbore sealing plug 5 is aligned with the second branch wellbore 23.

[0078] Step 4: Continue to apply pressure to the two oil pipes. During the process of guiding the dual-tube guiding tool 4 into position, the protrusion 151 of the wellbore connector 15 will push the trigger plate 48 to move upward. When the dual-tube guiding tool 4 is fully in place, the rectangular through hole 483 of the trigger plate 48 is aligned with the suspension block 47. Continue to apply a certain drilling pressure, the first branch wellbore sealing plug 17 squeezes the suspension block 47, so that it enters the rectangular through hole 483 of the trigger plate 48. At this time, the first branch wellbore sealing plug 17 is released from suspension, and the first branch wellbore sealing plug 17 can enter the first branch wellbore 21, and the second branch wellbore sealing plug 5 can enter the main casing 11.

[0079] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double tube guide tool, characterized in that: include: A guide body (40) is provided with a first channel and a second channel, The first channel communicates with the two axial ends of the guide body (40) and points to the first branch wellbore (21). The second channel communicates with the upper end and the side wall of the guide body (40) and points to the second branch wellbore (23). A guide sleeve (42) for orientation is arranged on the outer wall of the guide body (40); A locking mechanism (480) for locking the first branch oil pipe (14) and / or the second branch oil pipe (13) is provided on the side wall of the guide body (40); after the guide body (40) is put into place in the well, the locking mechanism (480) releases the lock on the first branch oil pipe (14) and / or the second branch oil pipe (13).

2. The double tube guide tool according to claim 1, characterized in that: A first guide section (421) is provided on the guide sleeve (42).

3. The double tube guide tool according to claim 2, characterized in that: The locking mechanism (480) comprises: a trigger plate (48), the trigger plate (48) being slidably arranged on the outer wall of the guide body (40) along the axial direction; A hanging block (47) is radially slidably arranged on the outer wall of the guide body (40). In the locked state, the trigger plate (48) radially abuts against the outer wall of the hanging block (47), so that the inner end of the hanging block (47) locks the first branch oil pipe (14) and / or the second branch oil pipe (13); when the guide body (40) is in place, the trigger plate (48) moves so as to no longer abut against the hanging block (47), thereby unlocking the hanging block (47).

4. The double tube guide tool according to claim 3, characterized in that: A U-shaped groove (422) is provided on the side wall of the guide sleeve (42), the U-shaped groove (422) is located at the highest point of the first guide section (421), the locking mechanism (180) corresponds to the position of the U-shaped groove (422), and the protrusion (151) is provided at the highest point of the second guide section (152).

5. The double tube guide tool according to claim 3, characterized in that: The trigger plate (48) comprises an arc plate (481) axially slidably arranged on the outer wall of the guide body (40), and a cushion block (482) is fixedly arranged on the outer wall of the arc plate (481). When the guide body (40) is put into place in the well, the cushion block (482) is pushed upward by the downhole tool.

6. The double tube guide tool according to claim 5, characterized in that: A through hole matching the shape of the suspension block (47) is provided on the circular arc plate (481); when the circular arc plate (481) moves until the through hole is aligned with the suspension block (47), the circular arc plate (481) no longer abuts against the suspension block (47), thereby releasing the lock of the suspension block (47).

7. The double tube guide tool according to claim 5, characterized in that: An arc-shaped groove (411) is provided on the outer wall of the guide body (40), the arc plate (481) is axially slidably arranged in the arc-shaped groove (411), the cushion block (482) is located outside the arc-shaped groove (411), and a fan-shaped groove (412) for arranging the suspension block (47) is provided in the arc-shaped groove (411).

8. The double tube guide tool according to claim 7, characterized in that: The radial inner diameter of the fan-shaped groove (412) is smaller than the radial outer diameter.

9. The double tube guide tool according to any one of claims 1 to 8, characterized in that: The central axes of the first channel, the second channel and the guide body (40) are all located on the same plane.

10. The double tube guide tool according to any one of claims 1 to 8, characterized in that: The guide body (40) comprises an upper joint (41) and a lower joint (45) which are coaxially fixedly connected, the central axes of the first channel and the second channel are parallel to the central axis of the upper joint (41), and the central axes of the first channel and the second channel are inclined relative to the central axis of the lower joint (45).

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