Windowing tool for multilateral well

Abstract

The utility model relates to the technical field of multilateral wells, in particular to a multilateral well windowing tool. Comprising a packer, the upper end of the packer is concentrically and fixedly connected with a whipstock, the upper end of the whipstock is fixedly connected with a connecting pipe through a shear pin, a through groove is formed in the whipstock and comprises a vertical part and a straight part which are communicated with each other, the vertical part of the through groove is communicated with a setting liquid inlet channel of the packer, and a copper pipe is fixed in the lower end of the connecting pipe. The copper pipe comprises a vertical part and a straight part, one end of the straight part of the copper pipe protrudes to the outer side of the connecting pipe, one end of the straight part of the copper pipe on the outer side of the connecting pipe is inserted into the straight part of the through groove in a sealed mode, and the vertical part of the copper pipe is communicated with the connecting pipe. The guiding conical surface is arranged at the lower end of the connecting pipe, the thicker part of the upper portion of the whipstock can be connected with the lower end of the connecting pipe through the shear pin, the whipstock can be connected with the connecting pipe through the large-specification shear pin, and the pressure borne by the tool in the well can be increased.

Description

Technical Field

[0001] The utility model relates to the technical field of branch wells, in particular to a branch well window-opening tool. Background Art

[0002] In recent years, with the rapid development of drilling technology, the drilling and completion technologies of branch wells, as a new technology to reduce development costs and improve oil recovery, have been attracting more and more attention. However, due to the complexity of the bottom hole of branch wells themselves, especially the reliability of current branch well window-opening technologies, the development of branch wells has been greatly restricted. At present, there are mainly two methods in China: open-hole sidetracking branch wells and casing window-opening section milling sidetracking branch wells. However, the former has high requirements for formation characteristics, and it is difficult to control the wellbore trajectory of the sidetracking branch after window-opening. The completion process is restricted, with high difficulty and the success rate is hard to guarantee. During the process of casing window-opening section milling sidetracking branch wells, the number of trips for tripping in and out is large, the protection of the branch window is insufficient, the window-opening process is relatively complex, the protection of the external casing is insufficient, and bottom-hole complex situations are likely to occur. On this basis, technologies for expanding tube positioning branch wells have been developed at home and abroad. However, due to the complex construction process, the large number of trips for tripping in and out, and the high requirements for the size of the lower casing, their application scope is restricted to a certain extent.

[0003] In order to overcome the problem of the large number of trips for tripping in and out during casing window-opening section milling sidetracking branch wells, generally, the drill string is connected to the whipstock through shear pins. After the whipstock is positioned, the whipstock is separated from the drill string, and then drilling is started under pressure. The drill string and the whipstock form a single string of pipes, so the number of trips for pulling out the drill can be effectively reduced. However, this single string of pipes composed of the drill string and the whipstock is only applicable to vertical wells with simple well conditions. Since there is space between the connection parts of the drill string and the whipstock, it is easy to get stuck during the process of running in the hole. At the same time, the setting tool for positioning is connected to the upper pressure supply pipeline through an external connecting pipe. The connecting pipe is exposed and is likely to be damaged during the process of running in the hole, resulting in the inability to effectively position the whipstock.

[0004] A branch well window-opening tool with an expansion tube is disclosed in the patent document with the publication number of CN201162506Y. Before entering the well, the well entry orientation of the whipstock is adjusted according to the predetermined opening direction of the branch well window. After the device is lowered in place, ground pressure is applied according to the pump displacement required for the expansion of the setting pipe. The liquid enters the setting pipe through the sealed connection of the pre-sealed milling cone, transfer pipe, setting pipe and sealing plate. When the pressure difference inside and outside the setting pipe reaches a certain value, the setting pipe expands to the inner wall of the outer casing and makes close contact with it. After confirming that the setting is completed, the ground reduces the displacement, and the setting pipe does not rebound, and the lower whipstock tool setting is completed. After setting, the drill string is lifted slightly. Under the action of the pulling force, the transfer pipe is broken, and the drill string above the milling cone and the lower whipstock tool are released. After confirming the release, drilling pressure is applied, and under the action of the whipstock, a branch well is opened and sidetracked until the designed well depth. After completion of the well, the lower whipstock tool is recovered to the ground by using a supporting recovery tool. The transfer pipe of this tool is exposed, and problems such as damage to the transfer pipe may occur during the downhole process, which may further cause the whipstock to fail to set.

[0005] A patent document with the authorization announcement number CN116378595B discloses a coiled tubing casing one-trip window milling tool and its method, including the following steps: 1. Lowering into the well: Lower the coiled tubing casing window milling tool to the preset window milling position in the well. 2. First fixation: In the state where the copper pipeline is unobstructed and the working channel is closed, by pumping liquid into the coiled tubing, the liquid flows through the copper joint and the copper pipeline into the pressure chamber in sequence. Under the pressure of the liquid in the pressure chamber, the second piston moves downward. Since there is a connected sealed space between the second piston and the expansion tube, when the second piston moves downward, the space of this sealed space will decrease, resulting in an increase in the internal pressure of the expansion tube, and then the expansion tube expands to closely fit the inner wall of the casing, thus achieving fixed anchoring. When the second piston moves below the pressure relief port, the pumped liquid will be discharged from the pressure relief port, and the operator can judge whether the anchor has been anchored through the pressure change. At the same time, under the restoring force of the first spring, the limit block is pushed out of the chute to fix the position of the second piston. 3. Orientation: Through the orientation indexing tool, adjust the orientation of the window milling inclined plane, and change the angles of the window milling and reaming mill and the whipstock connected thereto, so that the orientation of the window milling inclined plane is consistent with the preset orientation. 4. Second fixation: In the state where the copper pipeline is unobstructed and the working channel is closed, by pumping liquid into the coiled tubing, since the orientation of the window milling inclined plane is adjusted during orientation, the angle of the whipstock changes, and the anchor has been fixed in the casing by the expansion tube at this time, resulting in a deflection of the angle between the whipstock and the anchor, causing the upper part and the lower part of the copper pipeline above the separation section to break and shift at the separation section, and then the broken copper pipeline is connected to the stamping chamber, so that the liquid flows through the copper joint and the broken copper pipeline into the stamping chamber in sequence. Subsequently, the liquid flows through the one-way valve and enters the anchor port to push the anchor tile to closely fit the casing, thus fixing the whipstock. 5. Separation: Since the anchor is fixed in the casing through the first fixation at this time, lift the coiled tubing. At this time, the shear bolt is in a state of double-sided shear, that is, the coiled tubing drives the pilot hole mill to lift, so that the pilot hole mill exerts an upward pulling force on the shear bolt, and the whipstock with its longitudinal position fixed by the anchor exerts a reverse acting force on the shear bolt, until this acting force is greater than the shear strength of the shear bolt, thus breaking the shear bolt and separating the window milling and reaming mill and the whipstock. 6. Window milling: After increasing the displacement to the shear pin shear displacement, the shear pin in the bypass switching valve is cut off, the first piston moves downward, the working channel is opened, the internal flow of the copper joint is cut off, the liquid flows through the positive displacement motor, and the rotation of the positive displacement motor drives the window milling and reaming mill to mill the casing under the guidance of the inclined plane of the whipstock. The copper pipeline part of this tool is exposed, and the problem of copper pipeline damage may occur during the process of lowering into the well, which may lead to the inability of the whipstock to be seated. Utility Model Content

[0006] The technical problem to be solved by the utility model is a branch well windowing tool that can ensure the effective setting of the whipstock after being lowered into the well and facilitate the lowering of the whipstock into the well.

[0007] In order to achieve the above object, the technical solution provided by the utility model is:

[0008] A branch well windowing tool includes a packer. A whipstock is fixedly connected concentrically to the upper end of the packer. The upper end of the whipstock is fixedly connected to a connecting pipe through a shear pin. The connecting pipe is concentric with the whipstock. A through groove is formed in the whipstock. The through groove includes a vertical part and a straight part that are connected and communicated. The vertical part of the through groove is communicated with the setting liquid inlet channel of the packer. A copper pipe is fixed inside the lower end of the connecting pipe. The copper pipe includes a vertical part and a straight part. One end of the straight part of the copper pipe protrudes to the outside of the connecting pipe. One end of the straight part of the copper pipe on the outside of the connecting pipe is hermetically inserted into the straight part of the through groove. The vertical part of the copper pipe is communicated with the connecting pipe. A guiding conical surface is formed at the lower end of the connecting pipe. The guiding conical surface closely adheres to the guiding inclined surface of the whipstock.

[0009] Specifically, a vertical inserting rod is fixed to the lower end of the connecting pipe. A vertical hole is formed in the guiding inclined surface of the whipstock. The vertical hole is concentric with the inserting rod. The lower end of the inserting rod is inserted into the vertical hole.

[0010] Specifically, a guiding ring is sleeved on the connecting pipe above the whipstock. A lower conical surface is machined at the lower end of the guiding ring. The lower conical surface is flush with the guiding conical surface.

[0011] Specifically, an upper conical surface is machined at the upper end of the guiding ring.

[0012] Specifically, a centralizer is fixed to the outside of the connecting pipe.

[0013] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0014] 1. By arranging a guiding conical surface at the lower end of the connecting pipe, the shear pin can connect the thicker position at the upper part of the whipstock with the lower end of the connecting pipe. Larger-sized shear pins can be used to connect the whipstock and the connecting pipe, which can increase the pressure that the tool can withstand when being lowered into the well, and can avoid accidental disconnection between the whipstock and the connecting pipe when the whipstock is stuck, facilitating the movement of the tool in a vertical shaft with complex well conditions.

[0015] 2. Through the insertion and cooperation of the inserting rod fixed to the lower end of the connecting pipe and the vertical hole on the whipstock, when rotating the whipstock through the connecting pipe and adjusting the angle of the whipstock, the shear pin can be prevented from breaking, and the torque that the tool can withstand can be improved.

[0016] 3. The connecting pipe is communicated with the setting liquid inlet channel of the packer through the copper pipe and the through groove, which can ensure the effective setting of the packer after the whipstock descends in place.

[0017] 4. The lower conical surface fits with the guiding inclined surface of the whipstock, which can improve the connection stability between the whipstock and the connecting pipe.

[0018] 5. The guiding conical surface provided at the lower end of the connecting pipe can guide this tool and avoid the situation of the connecting pipe being stuck when lowering it into the well. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the present utility model.

[0020] Figure 2 is Figure 1 an enlarged view of area A in

[0021] Figure 3 a schematic diagram of the connecting pipe.

[0022] The names of the components in the drawings are: 1. Packer, 2. Whipstock, 3. Connecting pipe, 4. Shearing pin, 5. Plug rod, 6. Guide ring, 7. Centralizer, 8. Copper pipe, 9. Through groove, 10. Guiding conical surface. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0024] Embodiment 1: Referring to Figures 1-3 as shown, a branch well window-opening tool includes a packer 1. A whipstock 2 is concentrically and fixedly connected to the upper end of the packer 1. The upper end of the whipstock 2 is fixedly connected to a connecting pipe 3 through a shearing pin 4. The connecting pipe 3 is concentric with the whipstock 2. A centralizer 7 is fixed to the outer side of the connecting pipe 3.

[0025] A through groove 9 is formed in the whipstock 2. The through groove 9 includes a vertical part and a straight part that are connected. The vertical part of the through groove 9 is communicated with the setting liquid inlet channel of the packer 1. A copper pipe 8 is fixed inside the lower end of the connecting pipe 3. The copper pipe 8 includes a vertical part and a straight part. One end of the straight part of the copper pipe 8 protrudes to the outside of the connecting pipe 3. One end of the straight part of the copper pipe 8 on the outside of the connecting pipe 3 is hermetically inserted into the straight part of the through groove 9. The vertical part of the copper pipe 8 is communicated with the connecting pipe 3.

[0026] The connecting pipe 3 is communicated with the setting liquid inlet channel of the packer 1 through the copper pipe 8 and the through groove 9, which can ensure that the packer 1 is effectively set after the whipstock 2 descends in place.

[0027] A guiding conical surface 10 is formed at the lower end of the connecting pipe 3. The guiding conical surface 10 closely adheres to the guiding inclined surface of the whipstock 2.

[0028] By providing a guiding conical surface 10 at the lower end of the connecting pipe 3, the shear pin 4 can connect the thicker position at the upper part of the whipstock 2 to the lower end of the connecting pipe 3. It is possible to use a large-sized shear pin 4 to connect the whipstock 2 and the connecting pipe 3, which can increase the pressure that the tool can withstand when it is lowered into the well, and can prevent the accidental disconnection between the whipstock 2 and the connecting pipe 3 when the whipstock 2 is stuck, facilitating the movement of the tool in a vertical shaft with complex well conditions.

[0029] A vertical insertion rod 5 is fixed to the lower end of the connecting pipe 3. A vertical hole is provided on the guiding inclined surface of the whipstock 2, and the vertical hole is concentric with the insertion rod 5. The lower end of the insertion rod 5 is inserted into the vertical hole.

[0030] By making the insertion rod 5 fixed to the lower end of the connecting pipe 3 inserted and matched with the vertical hole on the whipstock 2, when the whipstock 2 is rotated by the connecting pipe 3 and the angle of the whipstock 2 is adjusted, it can prevent the shear pin 4 from breaking and can improve the torsion that the tool can withstand.

[0031] The connecting pipe 3 is fixedly connected to the lower end of the pipe string. The tool is lowered into the set position of the vertical shaft through the pipe string, and then the tool is rotated through the pipe string to adjust the angle of the whipstock 2. After the angle of the whipstock 2 is adjusted, pressure is applied to the pipe string. The high-pressure liquid enters the setting liquid inlet channel of the packer 1 through the pipe string, the connecting pipe 3, the copper pipe 8 and the through groove 9, and then the packer 1 starts to set. When the packer 1 finishes setting, the pipe string is pulled upward. When the straight parts of the shear pin 4 and the copper pipe 8 are broken, the connecting pipe 3 is separated from the whipstock 2. Then, after the pipe string and the connecting pipe 3 are taken out, the drill tool is lowered. Under the guiding action of the guiding inclined surface of the whipstock 2, a branch well is drilled through windowing until the designed well depth.

[0032] Embodiment 2: On the basis of Embodiment 1, referring to Figure 1 and Figure 2 as shown, a guiding ring 6 is sleeved on the connecting pipe 3 above the whipstock 2. The lower end of the guiding ring 6 is processed with a lower conical surface, which is flush with the guiding conical surface 10, and the lower conical surface fits the guiding inclined surface of the whipstock 2. The upper end of the guiding ring 6 is processed with an upper conical surface.

[0033] Referring to Figure 2 as shown, the lower part of the guiding ring 6 is located between the upper part of the whipstock 2 and the connecting pipe 3, and the lower conical surface of the guiding ring 6 fits the guiding inclined surface. Therefore, it can increase the effective contact area between the whipstock 2 and the connecting pipe 3 and can improve the connection stability between the whipstock 2 and the connecting pipe 3.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A branch well window-opening tool, comprising a packer (1), an upper end of the packer (1) is fixedly connected with a whipstock (2) concentrically, an upper end of the whipstock (2) is fixedly connected with a connecting pipe (3) through a shear pin (4), the connecting pipe (3) is concentric with the whipstock (2), and is characterized in that, The whipstock (2) is provided with a through groove (9) inside. The through groove (9) includes a vertical part and a straight part that are communicated with each other. The vertical part of the through groove (9) is communicated with the setting liquid inlet channel of the packer (1). A copper pipe (8) is fixed inside the lower end of the connecting pipe (3). The copper pipe (8) includes a vertical part and a straight part. One end of the straight part of the copper pipe (8) protrudes to the outside of the connecting pipe (3). One end of the straight part of the copper pipe (8) on the outside of the connecting pipe (3) is hermetically inserted into the straight part of the through groove (9). The vertical part of the copper pipe (8) is communicated with the connecting pipe (3). A guiding conical surface (10) is provided at the lower end of the connecting pipe (3). The guiding conical surface (10) is in close contact with the guiding inclined surface of the whipstock (2).

2. The openhole tool for branch wells according to claim 1, characterized in that A vertical insertion rod (5) is fixed at the lower end of the connecting pipe (3). A vertical hole is provided on the guiding inclined surface of the whipstock (2). The vertical hole is concentric with the insertion rod (5). The lower end of the insertion rod (5) is inserted into the vertical hole.

3. The branch well window-opening tool according to claim 1, wherein A guiding ring (6) is sleeved on the connecting pipe (3) above the whipstock (2). A lower conical surface is machined at the lower end of the guiding ring (6). The lower conical surface is flush with the guiding conical surface (10). The lower conical surface is in contact with the guiding inclined surface of the whipstock (2).

4. The openhole sidetracking tool according to claim 3, wherein An upper conical surface is machined at the upper end of the guiding ring (6).

5. The branch well window-opening tool according to claim 1, characterized in that A centralizer (7) is fixed on the outside of the connecting pipe (3).

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