Integrated whipstock connecting structure and coiled tubing windowing device

Abstract

The utility model relates to the technical field of petroleum multilateral well drilling, and provides an integrated whipstock connecting structure and a coiled tubing windowing device.The integrated whipstock connecting structure comprises a whipstock body, a sliding hole is formed in the whipstock body, a whipstock face is formed in the whipstock body, and the whipstock face is used for guiding a windowing milling cone; the shear pin I penetrates through the whipstock body and is fixedly connected with the windowing milling cone; the reinforcing rod slides relative to the sliding hole and is rotationally arranged, and the end, close to the windowing milling cone, of the reinforcing rod is provided with first external threads; the connector is detachably arranged on the windowing milling cone, a connecting hole is formed in the connector, the connecting hole is provided with a first internal thread, and the first internal thread is in threaded connection with the first external thread; by means of the technical scheme, the problems that in the prior art, the shear strength borne by a screw cannot be controlled, and it cannot be guaranteed that the whipstock and the windowing milling cone are smoothly separated while it cannot be guaranteed that the whipstock safely descends into a well are solved.

Description

Technical Field

[0001] This utility model relates to the field of oil branch well drilling technology, specifically to an integrated guide vane connection structure and a continuous tubing window opening device. Background Technology

[0002] Directional and horizontal well technologies have become increasingly sophisticated; however, limitations in surface well networks prevent the deployment of more adjustment wells. Branch wells, as an extension and development of directional well technology, utilize existing well casing for window-opening sidetracking, effectively reusing it and thus gaining increasing importance. The guide tool, also known as a directional guide, is used to guide the window milling cone during window-opening sidetracking of existing well casing. It is a key tool in branch well drilling technology, playing a crucial role in both drilling and completion processes.

[0003] Typically, the guide vane is mounted on the window milling cone using one or more screws. Once the guide vane is lowered into position, it is fixed inside the casing downhole. The window milling cone is then driven to rotate or move up and down, applying shear force to the screws. This shear force causes the screws to break, separating the guide vane from the window milling cone. However, downhole conditions are extremely complex, and the shear strength experienced by the screws during the downhole process is very difficult to control. If the screws are designed to withstand large shear forces, they are not easy to shear after setting, making separation of the guide vane and window milling cone difficult. If the screws are designed to withstand small shear forces, they may break prematurely due to obstruction during downhole operation or additional bending moments caused by a large well inclination, resulting in premature "disengagement." This compromises the safe downhole installation of the guide vane, the reliability of the setting, and the smooth operation of the window milling cone. Therefore, improvements and optimizations to the existing technology are necessary. Utility Model Content

[0004] This utility model proposes an integrated guide vane connection structure and a continuous tubing window opening device, which solves the problem in related technologies that the shear strength of the screws cannot be controlled, and that it is impossible to ensure the safe lowering of the guide vane into the well while ensuring the smooth separation of the guide vane and the window opening milling cone.

[0005] The technical solution of this utility model is as follows:

[0006] An integrated guide vane connection structure includes:

[0007] A guide body is provided with a sliding hole and a guide surface, which is used to guide the window milling cone.

[0008] Shear pin one passes through the guide body and is fixedly connected to the window milling cone;

[0009] A reinforcing rod is arranged to slide and rotate relative to the sliding hole, and has external thread one at one end close to the window milling cone;

[0010] A connecting head is detachably arranged on the window milling cone, and has a connecting hole with internal thread one, and the internal thread one and the external thread one are threadedly connected.

[0011] As a further technical solution, a limiting groove and an annular groove are arranged on the side wall of the sliding hole and communicate with each other, and further comprising:

[0012] A pin key is arranged on the reinforcing rod, and the pin key is coincident with or non-coincident with the limiting groove after the reinforcing rod rotates;

[0013] A limiting piece is arranged in the annular groove, and the pin key abuts against or non-abuts against the limiting piece after the reinforcing rod rotates.

[0014] As a further technical solution, further comprising:

[0015] An elastic piece is arranged in the sliding hole, one end of the elastic piece acts on the guide body, and the other end of the elastic piece acts on the reinforcing rod.

[0016] As a further technical solution, a multi-purpose hole is arranged at one end of the reinforcing rod close to the window milling cone, an internal thread two is arranged on the inner wall of the multi-purpose hole, and further comprising:

[0017] A reinforcing column is arranged on the window milling cone, and has external thread two, and the external thread two and the internal thread two are threadedly connected.

[0018] A coiled tubing windowing device comprises the integrated whipstock connector structure described above, the guide body is provided with an oil storage chamber and a pressurizing chamber which communicate with each other, a locking hole is arranged on the side wall of the pressurizing chamber, and further comprising:

[0019] A sliding cone is arranged in the pressurizing chamber to slide;

[0020] A locking piece is arranged to slide relative to the locking hole;

[0021] A shear pin two is used to connect the sliding cone and the locking piece.

[0022] As a further technical solution, the number of the sliding cones is two, and the sliding cones are symmetrically distributed above and below in the pressurizing chamber; the number of the locking holes and the locking pieces is several, and one sliding cone corresponds to several locking pieces; the locking holes and the locking pieces are circumferentially distributed with the center line of the sliding cone as the center.

[0023] As a further technical solution, further comprising:

[0024] A sealing ring is sleeved on the sliding cone and located between the sliding cone and the inner wall of the pressurizing chamber, and the number of the sealing rings is several.

[0025] As a further technical solution, further comprising:

[0026] A plurality of drill rods are sequentially connected end to end, and the lowermost drill rod is provided with the window milling cone, and the drill rods are rotated by the power provided by the external power source.

[0027] The working principle and beneficial effects of the utility model are as follows:

[0028] In the utility model, when the guide body is lowered into the well, if the guide body is blocked or affected by other environments, causing the shear pin to break prematurely, the connection between the guide body and the window milling cone can still be achieved through the reinforcing rod, preventing the guide body from losing the grip; at this time, the guide body can be retracted, the problems of the downhole casing are checked and removed, and the guide body is lowered into the well again to ensure that the guide body is safely and smoothly lowered into the well and delivered to the preset position. If the encountered obstacle is only the broken shear pin, at this time, the guide body can also be forced to continue to be lowered into the well, and the guide body is pushed to continue to be lowered into the well and delivered to the preset position by means of the threaded connection between the reinforcing rod and the connecting head. Regardless of the choice, the guide body can be prevented from losing the grip and delivered to the preset position. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above-mentioned features, technical characteristics, advantages and implementation modes of the utility model will be further described in a clear and understandable manner in combination with the preferred embodiments and the accompanying drawings.

[0030] Figure 1 It is a structure diagram of the connection between the guide body and the window milling cone of the utility model;

[0031] Figure 2 It is a structure diagram of the connection between the guide body and the window milling cone of the utility model; Figure 1 It is an enlarged view of part A in the middle;

[0032] Figure 3 It is an enlarged view of part B in the middle; Figure 1 It is an enlarged view of part B in the middle;

[0033] Figure 4 It is a structure diagram of the connection between the guide body and the window milling cone of the utility model;

[0034] Figure 5 It is a structure diagram of the connection between the guide body and the window milling cone of the utility model;

[0035] Figure 6 It is the local structure schematic view of the multiple hole of the reinforcing rod of the utility model;

[0036] Figure 7 It is the structure schematic view of the whole of the guide incline body, the window milling cone and the drill rod combined of the utility model;

[0037] Figure 8 It is Figure 7 The local enlarged view of C;

[0038] In the figure: 1, guide incline body, 2, sliding hole, 3, guide incline surface, 4, window milling cone, 5, shear pin one, 6, reinforcing rod, 7, external thread one, 8, connecting head, 9, connecting hole, 10, internal thread one, 11, limit slot, 12, annular groove, 13, pin key, 14, limiting piece, 15, elastic piece, 16, multiple hole, 17, internal thread two, 18, reinforcing column, 19, external thread two, 20, oil storage chamber, 21, pressurizing chamber, 22, locking hole, 23, sliding cone, 24, locking piece, 25, shear pin two, 26, sealing ring, 27, drill rod, 28, inner chamber, 29, outer chamber. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or prior art, the specific implementation of the present utility model will be described below with reference to the drawings. Obviously, the drawings described below in the description are only some embodiments of the present utility model, and other drawings and other implementation manners can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0040] In order to make the drawing simple, only the parts related to the utility model are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0041] In this paper, it should be noted that, unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present utility model can be understood according to the specific circumstances.

[0042] In addition, in the description of the present application, the terms "first", "second", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0043] Embodiment one, refer to Figures 1-6 For the first embodiment of the utility model, an integrated guide device connecting structure is provided.

[0044] In this embodiment, the guide device connecting structure comprises a guide body 1, a shear pin 5, a reinforcing rod 6 and a connecting head 8. The shear pin 5 can be a screw commonly used in the prior art. The shear strength of the shear pin 5 does not need to be too high.

[0045] Before use, the connecting head 8 is fixed to the window milling cone 4. The reinforcing rod 6 and the connecting head 8 are aligned, the upper end of the external thread 7 of the reinforcing rod 6 abuts against the internal thread 10 of the connecting head 8, then the reinforcing rod 6 and the window milling cone 4 are relatively rotated, the internal thread 10 and the external thread 7 are threadedly connected together, then the guide body 1 is rotated to adjust the relative position between the window milling cone 4 and the guide body 1, facilitating the installation of the shear pin 5 and the fixation between the window milling cone 4 and the guide body 1. At this time, there are two layers of fixation between the window milling cone 4 and the guide body 1, which are the shear pin 5 and the reinforcing rod 6 respectively.

[0046] When the guide body 1 is lowered into the well, if the guide body 1 encounters resistance or is affected by other environments, causing the shear pin 5 to break prematurely, the guide body 1 and the window milling cone 4 can still be connected through the reinforcing rod 6 at this time, preventing the guide body 1 from losing the "hand" phenomenon. At this time, the guide body 1 can be retrieved, the problems existing in the downhole casing are checked and removed, and the guide body 1 is re-lowered into the well to ensure that the guide body 1 is safely and smoothly lowered into the well and delivered to the pre-set position. If the encountered resistance only causes the shear pin 5 to break, at this time, the guide body 1 can also be selected to continue to be forcedly lowered into the well, and the guide body 1 is pushed to continue to be lowered into the well and delivered to the pre-set position by means of the thread connection between the reinforcing rod 6 and the connecting head 8. Regardless of which option is made, the "hand" phenomenon can be prevented, and the guide body 1 can be ensured to be delivered to the pre-set position.

[0047] When the guide body 1 is lowered into the well, if everything goes well, the guide body 1 is successfully delivered to the preset position; after the guide body 1 is delivered to the position, the guide body 1 is fixed on the downhole casing by using the technical means in the prior art; then external force is applied to drive the window milling cone 4 to rotate, the shear pin 5 is broken under stress; then the window milling cone 4 is continuously driven to rotate, and the window milling cone 4 is pulled upward at the same time, so that the internal thread 10 and the external thread 7 are gradually separated until they are separated, at which time the separation of the window milling cone 4 and the guide body 1 is completed; the reinforcing rod 6 slides downward along the sliding hole 2 by means of its own gravity until it is completely accommodated in the sliding hole 2, at which time the window milling cone 4 is pushed downward to move, the window milling cone 4 abuts against the guide surface 3, the advancing direction of the window milling cone 4 gradually changes by means of the guiding effect of the guide surface 3, and gradually changes toward the sidewall direction of the downhole casing; at the same time, the window milling cone 4 is driven to rotate to open a side window on the sidewall of the downhole casing to open a new pipeline port.

[0048] Embodiment two, refer to Figures 1-6 , as the second embodiment of the utility model, on the basis of embodiment one, this embodiment further refines the structure of the guide body 1, the limiting groove 11 and the annular groove 12 that are in communication with each other are formed in the sidewall of the sliding hole 2, and the pin key 13, the limiting piece 14 and the elastic piece 15 are additionally arranged, and the elastic piece 15 can be selected from the spring in the prior art. The reinforcing rod 6 has two states on the guide body 1, namely, accommodation and external release, in the accommodation state, the pin key 13 is located in the limiting groove 11; in the external release state, the pin key 13 is located in the annular groove 12. When the reinforcing rod 6 and the window milling cone 4 are connected, the reinforcing rod 6 is first pulled upward along the limiting groove 11 until the pin key 13 slides to the position of the annular groove 12, at which time the reinforcing rod 6 is rotated to make the pin key 13 separate from the limiting groove 11 and be completely clamped into the annular groove 12, at which time the position between the reinforcing rod 6 and the guide body 1 is relatively fixed; then the internal thread 10 and the external thread 7 are aligned, the reinforcing rod 6 and the window milling cone 4 are relatively rotated, and the thread connection of the internal thread 10 and the external thread 7 is completed.

[0049] When the reinforcing rod 6 slides upward, one end of the elastic piece 15 is synchronously moved, the elastic piece 15 is elongated and accumulates elastic force, and when the pin key 13 separates from the limiting groove 11 and is clamped into the annular groove 12, the elastic force accumulated by the elastic piece 15 reaches the maximum. A turntable is arranged at the bottom of the sliding hole 2 and the lower end of the reinforcing rod 6 respectively, and the two ends of the elastic piece 15 are fixed on the turntables respectively.

[0050] When the guide body 1 is transported to the preset position, the guide body 1 is fixed to the inner wall of the downhole casing, at this time, the windowing milling cone 4 is driven to rotate, the reinforcing rod 6 is synchronously rotated first, at this time, the pin keys 13 in the annular groove 12 gradually approach the limiting pieces 14, until the pin keys 13 are in extrusion contact with the limiting pieces 14, the limiting pieces 14 are located at the edge of the limiting groove 11, at this time, the pin keys 13 in the annular groove 12 are just aligned with the limiting groove 11; then the windowing milling cone 4 is continuously driven to rotate, the inner thread one 10 and the outer thread one 7 are gradually separated, after the reinforcing rod 6 and the connecting head 8 are separated, the elastic member 15 releases the accumulated elastic force, at this time, the reinforcing rod 6 slides downward along the sliding hole 2 by the action force provided by the elastic member 15, until the elastic member 15 reaches a stable state, at this time, the outer thread one 7 is completely stored in the sliding hole 2; then the windowing milling cone 4 is driven to perform side windowing operation on the side wall of the downhole casing.

[0051] Embodiment three, refer to Figures 1-6 , for the third embodiment of the utility model, on the basis of embodiment one or embodiment two, this embodiment further, the structure of reinforcing rod 6 is refined, specifically, a plurality of holes 16 are arranged on the end of the reinforcing rod 6 close to the windowing milling cone 4, and inner threads two 17 are arranged on the inner wall of the plurality of holes 16; after the side windowing operation is completed, the lower end of the recovery rod is provided with outer threads three, the outer threads three are just matched with the inner threads two 17, the position of the recovery rod is adjusted to make the outer threads three and the inner threads two 17 be in alignment, then the recovery rod is driven downward and rotated to make the recovery rod be screwed into the plurality of holes 16, and then the fixed connection between the guide body 1 and the downhole casing is cancelled; when the recovery rod is pulled upward, the reinforcing rod 6 slides upward for a distance first, and then the reinforcing rod 6 and the guide body 1 are in a relatively static state; the guide body 1 is retracted by means of the recovery rod pulled upward. Further, a reinforcing column 18 is additionally arranged, the outer thread one 7 and the inner thread one 10 are aligned when the guide body 1 is lowered into the well, at this time, the inner threads two 17 and the outer threads two 19 are simultaneously in alignment, when the outer thread one 7 is screwed into the inner thread one 10, the outer threads two 19 are also screwed into the inner threads two 17. In the process of lowering into the well, the reinforcing column 18 fills the plurality of holes 16, the connection strength of the upper end of the reinforcing rod 6 is improved, and the outer thread one 7 is prevented from being collapsed to the center due to stress of the upper end of the reinforcing rod 6, so that a gap is formed between the outer thread one 7 and the inner thread one 10, and the disengagement phenomenon is caused.

[0052] Embodiment four, refer to Figures 1-8 , for the fourth embodiment of the utility model, a continuous tubing windowing device is provided.

[0053] In the embodiment, the windowing device comprises the integrated guide cone connecting structure in the first embodiment, the second embodiment and the third embodiment; on this basis, other structures are further improved, the oil storage chamber 20 and the pressurizing chamber 21 are arranged on the guide body 1 and are in communication with each other, the locking hole 22 is arranged on the side wall of the pressurizing chamber 21, the sliding cone 23, the locking piece 24, the shear pin 25 and the sealing ring 26 are further added, and the drill pipe 27 is further added. In operation, the windowing milling cone 4 and the guide body 1 are simultaneously conveyed downward through the drill pipes 27, the oil storage chamber 20 is connected with the hydraulic station on the well through the connecting oil pipe; the sliding cone 23 and the sealing ring 26 cooperate to divide the pressurizing chamber 21 into the inner chamber 28 and the outer chamber 29, the number of the sliding cone 23 is two, two outer chambers 29 are correspondingly formed, one common inner chamber 28 is formed, and the two outer chambers 29 are respectively located above and below the inner chamber 28. The locking piece 24 is located in the outer chamber 29, and the locking hole 22 is arranged on the side wall of the outer chamber 29.

[0054] When the guide body 1 reaches the preset position, the hydraulic station supplies oil to the oil storage chamber 20 through the connecting oil pipe, the oil enters the inner chamber 28 through the oil storage chamber 20, and the two sliding cones 23 are pushed to slide in opposite directions by virtue of the extrusion of the oil, the sliding of the sliding cone 23 applies a shearing force to the shear pin 25, the shear pin 25 is broken under the action of the shearing force, and the shear pin 25 can be selected from the existing technology; the sliding cone 23 and the locking piece 24 are separated, and when the sliding cone 23 slides in the pressurizing chamber 21, the locking piece 24 is extruded, the locking piece 24 slides away from the sliding cone 23 along the locking hole 22, and the locking piece 24 is extruded and contacted with the inner wall of the downhole casing until the guide body 1 is fixed in the downhole casing by the locking piece 24, thereby preparing for the subsequent side windowing operation.

[0055] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all of them should be covered in the scope of the claims of the present application.

Claims

1. An integrated guide vane connection structure, characterized in that, include: The guide body (1) has a sliding hole (2) and a guide surface (3) for guiding the window milling cone (4). Shear pin 1 (5) passes through the guide body (1) and is fixedly connected to the window milling cone (4); The reinforcing rod (6) is slidably and rotatably disposed relative to the sliding hole (2), and the end of the reinforcing rod (6) near the opening milling cone (4) has an external thread (7). The connector (8) is detachably mounted on the window milling cone (4). The connector (8) has a connecting hole (9) with an internal thread (10). The internal thread (10) and the external thread (7) are threaded together.

2. The integrated guide vane connection structure according to claim 1, characterized in that, The sliding hole (2) has a limiting groove (11) and an annular groove (12) that are interconnected on its side wall, and also includes: A key (13) is provided on the reinforcing rod (6). After the reinforcing rod (6) is rotated, the key (13) coincides with or cancels the coincidence with the limiting groove (11). The limiting member (14) is disposed in the annular groove (12). After the reinforcing rod (6) rotates, the pin (13) abuts against or cancels the abutment with the limiting member (14).

3. The integrated guide vane connection structure according to claim 2, characterized in that, Also includes: An elastic element (15) is disposed in the sliding hole (2). One end of the elastic element (15) acts on the guide body (1), and the other end of the elastic element (15) acts on the reinforcing rod (6).

4. The integrated guide vane connection structure according to claim 1 or 3, characterized in that, The reinforcing rod (6) has a multi-purpose hole (16) at one end near the window milling cone (4), and the inner wall of the multi-purpose hole (16) is provided with an internal thread (17). It also includes: A reinforcing post (18) is provided on the window milling cone (4). The reinforcing post (18) has an external thread (19), and the external thread (19) and the internal thread (17) are connected by a thread.

5. A continuous tubing window opening device, characterized in that, The integrated guide vane connection structure includes any one of claims 1 to 4, wherein the guide vane body (1) has an interconnected oil storage chamber (20) and a pressurization chamber (21), and the side wall of the pressurization chamber (21) has a locking hole (22), and further includes: A sliding cone (23) is slidably disposed within the pressurized chamber (21); The locking element (24) is slidably disposed relative to the locking hole (22); Shear pin two (25) is used to connect the sliding cone (23) and the locking member (24).

6. A continuous tubing window opening device according to claim 5, characterized in that, There are two sliding cones (23), which are symmetrically distributed in the pressurized chamber (21); there are several locking holes (22) and several locking pieces (24), with one sliding cone (23) corresponding to several locking pieces (24); the locking holes (22) and the locking pieces (24) are distributed in a circle with the center line of the sliding cone (23) as the center.

7. A continuous tubing window opening device according to claim 6, characterized in that, Also includes: A sealing ring (26) is fitted on the sliding cone (23) and located between the sliding cone (23) and the inner wall of the pressurized chamber (21). The number of sealing rings (26) is several.

8. A continuous tubing window opening device according to claim 5, characterized in that, Also includes: There are several drill rods (27), which are connected end to end in sequence. The bottom drill rod (27) is provided with the window milling cone (4). The drill rod (27) rotates with the power provided by an external power source.

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