A sealing and windowing integrated whipstock device

Abstract

The utility model discloses a kind of sealing layer and windowing integrated deflector device, including windowing milling cone, deflector, support slip hydraulic assembly, hand-off sub, permanent packer sequentially connected from top to bottom;Support slip hydraulic assembly includes deflector anchoring slip and deflector support slip;The upper end of hand-off sub is connected with the lower end of deflector support slip by screw thread;The lower end of windowing milling cone is connected between the upper end of deflector by pin;The upper end of deflector is communicated with capillary tube;Deflector, support slip hydraulic assembly, hand-off sub and permanent packer are interconnected between each other.Utilize the utility model, sealing packer, deflector, windowing milling cone can be realized to be placed in place one time, can avoid conventional deflector process cumbersome, construction time is long, cost is high and prone to accident etc.

Description

Technical Field

[0001] This utility model relates to the field of drilling technology, specifically to an integrated guide vane device for sealing and opening. Background Technology

[0002] Currently, many production wells in the oilfield have entered the late stage of development, with a significant decrease in single-well production. In order to achieve overall production improvement, it is necessary to carry out reservoir redevelopment on depleted wells. Exploring the stagnant zones between potential wells and small-scale reservoirs at the oil layer edges is particularly important. Casing windowing technology refers to using guide vanes and milling tools to mill the casing at a designated depth in the existing wellbore. By drilling directional and horizontal wells through casing windowing, not only can dead wells be revived and old wells renewed, maintaining and improving the original well network structure, but also old well operations can be fully utilized, extending the life of oil and gas reservoirs and ultimately improving the oil and gas recovery rate of single wells.

[0003] The conventional sidetracking procedure for directional drilling tools is as follows: first, the bridge plug is lowered, and the filler layer is sealed (to prevent overflow and blowout); then, the directional drilling tool seat is lowered and anchored; finally, the window milling cone is lowered to the designated window opening position to complete the window opening. For ultra-deep wells, the conventional directional drilling tool procedure is cumbersome, time-consuming, costly, and prone to accidents. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention aims to provide an integrated guide device for sealing and opening.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An integrated screed and window-opening guide device includes, from top to bottom, a window-opening milling cone, a guide, a hydraulic assembly of support slips, a release section, and a permanent packer; the hydraulic assembly of support slips includes guide anchor slips and guide support slips; the upper end of the release section is threadedly connected to the lower end of the guide support slips; the window-opening milling cone and the guide are connected by a pin; the upper end of the guide is connected to a capillary tube; the guide, the hydraulic assembly of support slips, the release section, and the permanent packer are interconnected.

[0007] The permanent packer includes an upper connector, a central tube, slip 1, cone 1, back ring 1, rubber sleeve, back ring 2, cone 2, slip 2, locking ring, cylinder liner, piston, and guide shoe; the upper end of the upper connector is connected to the lower end of the release section, and the lower end of the upper connector is connected to the upper end of the central tube; the guide shoe is connected to the lower end of the central tube; slip 1, cone 1, back ring 1, rubber sleeve, back ring 2, cone 2, slip 2, locking ring, cylinder liner, and piston are all fitted onto the outside of the central tube; The piston is axially movable within the cylinder liner. The surface of the central tube has a pressure-transmitting hole communicating with the interior of the cylinder liner. The pressure-transmitting hole is located below the piston. The upper and lower ends of the rubber sleeve abut against cone one and cone two, respectively. The tapered ends of cone one and cone two are respectively engaged with the inner rings of slip one and slip two. The upper end of the piston can abut against slip two through axial movement, and at this time, the locking ring locks the piston. Slip one abuts against the upper connector.

[0008] The guide vane anchoring slip and the guide vane support slip are respectively the axial slip and the transverse slip.

[0009] Furthermore, the upper end of the rubber tube and the cone one, and the lower end of the rubber tube and the cone two, are respectively provided with the back ring one and the back ring two.

[0010] Furthermore, the guide vane support includes an inner tube and an outer tube, with an expansion cone and a vane disposed between the inner and outer tubes. Both the expansion cone and the vane are fitted onto the outside of the inner tube, and the conical end of the expansion cone is fixed to the inner ring of the vane by a pin. The surface of the outer tube has a window corresponding to the position of the vane, and the vane is embedded in the window. A spacer is fitted onto the outside of the inner tube, located below the expansion cone. A pressure-pressurizing liquid input channel is formed between the top surface of the spacer and the bottom surface of the expansion cone. The pressure-pressurizing liquid input channel has a... The inner tube has a connecting port; a receiving space is formed below the partition, the receiving space has an opening communicating with the inner tube, and a switch valve body is provided in the receiving space, the switch valve body is used to block the lower end of the inner tube; the upper end of the release stub is threadedly connected to the lower end of the outer tube; an isolation tube is also sleeved inside the inner tube, and the isolation tube blocks the connection port between the pressurized liquid input channel and the inner tube, as well as the opening between the receiving space and the inner tube; the lower end of the isolation tube extends into the inside of the release stub and is fixedly connected to it.

[0011] Furthermore, the locking ring is a ratchet locking ring.

[0012] Furthermore, the maximum outer diameter of the upper connector and cylinder liner is the same, and larger than the outer diameter of the first and second slips and the rubber sleeve.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model can be used to place the packer, guide device, and window milling cone into place at one time, which can avoid the problems of cumbersome procedures, long construction time, high cost and easy accidents of conventional guide devices.

[0015] 2. In this utility model, the pressure transmission of the permanent packer and the guide plate is independent of each other and does not affect each other, which can effectively prevent simultaneous hanging. Furthermore, the guide plate and the permanent packer can be separated from each other, thus allowing them to be placed at a distance and avoiding the impact of vibration on the permanent packer during the opening process.

[0016] 3. The guide vane is anchored by lateral and axial slips. The anchoring section has a large span, making the anchoring stable and reliable, and has strong anti-torsion and anti-up-down movement capabilities. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the integrated sealing and windowing guide device in Embodiment 1 of this utility model;

[0018] Figure 2 This is a schematic diagram of the specific structure of the permanent packer in Embodiment 1 of this utility model;

[0019] Figure 3 This is a diagram showing the connection structure of the guide vane support and the release section in Embodiment 1 of this utility model. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings. It should be noted that this embodiment is based on the present technical solution and provides detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to this embodiment.

[0021] Example 1

[0022] This embodiment provides an integrated guide device for sealing and opening windows, such as... Figure 1 As shown, the assembly includes, from top to bottom, a window milling cone 1, a guide vane 2, a hydraulic support slip assembly 5, a release sub 6, and a permanent packer 7. The hydraulic support slip assembly 5 includes a guide vane anchoring slip 3 and a guide vane support slip 4. The upper end of the release sub 6 is threadedly connected to the lower end of the guide vane support slip 4. The window milling cone 1 and the guide vane 2 are connected by a pin. The upper end of the guide vane 2 is connected to a capillary tube 8. The guide vane 2, the hydraulic support slip assembly 5, the release sub 6, and the permanent packer 7 are interconnected.

[0023] like Figure 2As shown, the permanent packer 7 includes an upper connector 9, a central tube 10, a first slip 11, a first cone 12, a first back ring 13, a rubber sleeve 14, a second back ring 15, a second cone 16, a second slip 17, a locking ring 18, a cylinder liner 19, a piston 20, and a guide shoe 21; the upper end of the upper connector 9 is connected to the lower end of the release section 6, and the lower end of the upper connector 9 is connected to the upper end of the central tube 10; the guide shoe 21 is connected to the lower end of the central tube 10; the first slip 11, the first cone 12, the first back ring 13, the rubber sleeve 14, the second back ring 15, the second cone 16, the second slip 17, the locking ring 18, the cylinder liner 19, and the piston 20 are all sleeved on the outside of the central tube 10;

[0024] The piston 20 is axially movable within the cylinder liner 19. The surface of the central tube 10 is provided with a pressure transmission hole 22 communicating with the interior of the cylinder liner 19. The pressure transmission hole 22 is located below the piston 20. The upper and lower ends of the rubber sleeve 14 abut against the cone 12 and the cone 2 16, respectively. The back ring 13 and the back ring 2 15 are respectively provided between the upper end of the rubber sleeve 14 and the cone 12, and between the lower end of the rubber sleeve 14 and the cone 2 16. The conical ends of the cone 12 and the cone 2 16 are respectively engaged in the inner rings of the slip 11 and the slip 2 17. The upper end of the piston 20 can abut against the slip 2 17 through axial movement, and at this time the locking ring 18 locks the piston 20. The slip 11 abuts against the upper connector 9.

[0025] The specific process of permanent packer 7 achieving setting is as follows: Permanent packer 7 is lowered into the oil casing using a guide shoe, and pressurized liquid is introduced through capillary tube 8. The pressurized liquid passes through guide 2, guide anchor slip 3, guide support slip 4, and release sub 6 into the central tube 10, and then enters the cylinder liner 19 through pressure transmission hole 22 to push piston 20 upward. Piston 20 applies upward pressure, causing slip 11 and slip 27 to rupture and embed in the inner wall of the oil casing. The rubber sleeve also expands under force and seals, thus completing the setting and permanently sealing the oil, gas, and water layers. At this time, the piston is locked by the locking ring, thereby maintaining the setting force and ensuring the setting is long-lasting and effective.

[0026] like Figure 3As shown, the guide vane 4 includes an inner tube 41 and an outer tube 42. An expansion cone 43 and a vane 44 are disposed between the inner tube 41 and the outer tube 42. Both the expansion cone 43 and the vane 44 are sleeved on the outside of the inner tube 41, and the conical end of the expansion cone 43 is fixed to the inner ring of the vane 44 by a pin 410. The surface of the outer tube 42 has a window 45 corresponding to the position of the vane 44, and the vane 44 is embedded in the window 45. A spacer 46 is sleeved on the outside of the inner tube 41. The spacer 46 is located below the expansion cone 43, and a pressurizing liquid input channel 47 is formed between the top surface of the spacer 46 and the bottom surface of the expansion cone 43. Channel 47 has a communication port connected to inner tube 41; a receiving space 48 is formed below the partition 46, the receiving space 48 has an opening communicating with inner tube 41, and a switch valve body 49 is provided in the receiving space 48, the switch valve body 49 is used to block the lower end of inner tube 41; the upper end of the release stub 6 is threadedly connected to the lower end of outer tube 42; an isolation tube 411 is also sleeved inside the inner tube 41, and the isolation tube 411 blocks the communication port between the pressurized liquid input channel 47 and inner tube 41 as well as the opening between the receiving space and inner tube 41; the lower end of the isolation tube 411 extends into the inside of the release stub 6 and is fixedly connected to it.

[0027] Before the release is completed, i.e. before the guide vane support slip 4 separates from the release stub 6, the isolation tube 411 blocks the connection between the pressurized liquid input channel 47 and the inner tube 41, as well as the opening between the accommodating space and the inner tube 41. Therefore, the pressurized liquid cannot enter the pressurized liquid input channel and will sequentially pass through the inner tube 41, the isolation tube 411, the release stub 6, and the central tube 10 through the pressure transmission hole 22 into the cylinder liner. After the permanent packer 7 is set, the release stub 6 separates from the outer tube 42, and the isolation tube 411 also leaves the interior of the inner tube 41. At this time, the connection between the pressurized liquid input channel 47 and the inner tube 41, as well as the opening between the accommodating space and the inner tube 41, are no longer blocked. The switch valve body 49 will leave the accommodating space under the action of gravity and fall to the lower end of the inner tube 41, sealing the lower end of the inner tube 41.

[0028] When the guide vane 4 is mounted, pressurizing liquid is introduced again from the capillary tube 8. The pressurizing liquid will enter the pressurizing liquid input channel 47 from the connecting port and push the expansion cone 43 to move upward to cut the pin 410. After the vane 44 is freed from the constraint of the expansion cone, it pops out of the window, completing the mounting.

[0029] In this embodiment, the guide vane 3 is an axial vane.

[0030] In this embodiment, the locking ring 18 is a ratchet locking ring.

[0031] In this embodiment, the maximum outer diameter of the upper connector and the cylinder liner is the same, and larger than the outer diameter of slip one, slip two, and the rubber sleeve. This protects slip one, slip two, and the rubber sleeve from premature sealing due to obstruction.

[0032] More specifically, the outer diameter parameters of one embodiment of the upper connector, cylinder liner, rubber sleeve, slip one, and slip two are shown in Table 1.

[0033] Table 1

[0034]

[0035] The outer diameter parameters of the upper connector, cylinder liner, rubber sleeve, slip one, and slip two in this embodiment are shown in Table 2.

[0036] Table 2

[0037]

[0038] In this embodiment, the lower end of the release section 6 is connected to the upper connector 9 via a forward thread, and the upper end of the release section 6 is connected to the lower end of the guide vane support slip 4 via a reverse thread. After the permanent packer is mounted, the portion above the release section 6 in the guide vane device remains inactive. After the sealing is verified, the portion above the release section 6 is rotated forward to disconnect the release section 6 from the lower end of the guide vane support slip 4, thus completing the release. The release section 6 and the permanent packer 7 are then separated from the guide vane support slip 4 and permanently remain downhole.

[0039] The release section 6 allows the guide vane 4 and permanent packer 7 to be separated, ensuring that subsequent components after the permanent packer is mounted will not affect its sealing performance. Furthermore, if the seal fails inspection, the portion above the release section 6 in the guide vane assembly can be removed and a cement plug applied for repair.

[0040] The working principle of the above-mentioned integrated sealing and windowing guide device is as follows:

[0041] Connect the upper end of the window milling cone to the tubing string, and use the tubing string to lower the entire guide vane device downhole;

[0042] First, the permanent packer 7 is used to pressurize and set the casing. In this embodiment, the permanent packer 7 can reliably set the casing in a P110 grade oil casing, with a temperature resistance of 177°C and a pressure resistance of 70 MPa.

[0043] After the permanent packer 7 was set, the sealing performance of the permanent packer 7 was verified by a ball-operated pressure test.

[0044] After the sealing test is completed, rotate the tubing forward until the guide vane support slip 4 separates from the release sub. The release sub and permanent packer 7 remain permanently downhole. After the release is completed, pull up the remaining part of the guide vane assembly to the designated window position.

[0045] The gyroscope was tested, and the seat of the guide rail support 4 was pressurized. After depressurization, the pipe column was laid to verify the completion of the anchoring support.

[0046] After verifying that the anchoring is normal, continue to apply pressure to push out the guide vane 3, complete the mounting of the guide vane 2, and lift it up to verify the mounting status.

[0047] Raise the pin between the shearing milling cone 1 and the guide slant 2, raise the milling cone 1 to the designated opening position, and perform the opening operation.

[0048] Example 2

[0049] This embodiment provides an application example of the guide device described in Embodiment 1.

[0050] (1) The guide device is lowered to the designed well depth, connected to the backwash pipeline, reverse circulation, circulation pump pressure ≤8MPa, circulate one drill string water hole volume, flush the ball seat and key joint, and ensure that the gyroscope is successfully seated and the permanent packer and guide device are successfully seated.

[0051] (2) Permanent packer setting: After the ball reaches the ball seat position, the permanent packer is pressurized to achieve setting. The pressurization requirement is to pressurize to 16MPa for the first time and stabilize for 5 minutes, then continue to pressurize to 26MPa and stabilize for 10 minutes, and then release the pressure.

[0052] Verification of sealing: Lower the tubing string by 30-50KN to verify the permanent packer setting. After setting, raise it back to the original suspended weight, close the packer and drill pipe plug valve, and perform annular pressure testing (determine the pressure value on-site according to the wellbore safety specifications) to verify the permanent packer seal.

[0053] (3) Release the permanent packer: After the permanent packer passes the pressure test, open the blowout preventer and drill string plug valve, lift the original suspended weight of the tubing by 10KN, and rotate forward 50 times to release the packer.

[0054] (4) Guided packer sealing: After the permanent packer is released, lift the tubing to the designed window position, lower the gyroscope to measure the gyroscope, and adjust the working surface of the guided packer according to the engineering design requirements. The lowering of the gyroscope must be carried out in strict accordance with the gyroscope instrument construction requirements.

[0055] After tool face adjustment, apply pressure: pressurize to 26MPa and stabilize for 10 minutes. During stabilization, the pressure drop should not exceed 1MPa, and the pressure should be released to 0. If the pressure drop is significant, the pressure can be repeatedly applied multiple times (before starting the pump and applying pressure, check the mud pump, surface manifold, and drill string, and adjust the mud pump safety pin to meet the requirement of 27MPa pressure during setting). Lower the tubing by 50-60KN to verify the successful mounting of the guide vane support slip 4. Continue to pressurize by 160KN to push out the guide vane anchoring slip 3, thus achieving the mounting of the guide vane anchoring slip 3 and completing the complete anchoring of the guide vane.

[0056] (5) Release the window milling cone: Raise the original suspended weight by 100-120KN, then lower it by 100-120KN. Repeat this 2-3 times. Then raise the original suspended weight of the window milling cone by 300-320KN and release the cone. Continue to raise the window milling cone by 3-4m and then lower it by 40KN. The release is now complete.

[0057] 4. Milling cone window opening operation

[0058] (1) Throw the second ball to establish a circulation channel and start milling. In order to ensure that the iron filings are fully carried out, the viscosity of the slurry should not be less than 65s.

[0059] (2) Lift the milling cone to about 1m above the top of the guide 2, start the pump and turntable, turntable speed 45-60rpm, and check the index weight.

[0060] (3) Slowly lower it to the top of guide vane 2 and begin the window opening operation:

[0061] Initial section: 0m-1m, drilling pressure 5-10KN, rotation speed 40-50rpm, displacement 16-24L / s

[0062] Riding section: 1m-2.5m, drilling pressure 10-60KN, speed 50-60rpm; displacement 16-24L / s

[0063] Outgoing casing section: 2.5m-3.2m, drilling pressure 10-80KN, rotation speed 50-60rpm; displacement 16-24L / s

[0064] Control the drilling pressure and rotation speed according to the window opening progress. The window opening progress is 4m. The window opening engineer can adjust the parameters at any time according to the site conditions.

[0065] (5) After the inclined plane is opened and the cutting depth is advanced, the milling cone enters the formation. If the formation is hard, the mechanical drilling speed may be slow, and the water hole may be blocked, which may cause the pump pressure to rise. This is related to the structure of the milling cone and the cutting elements, and is a normal phenomenon.

[0066] (6) After the window opening is completed with an advance of ≥3.5m, increase the turntable speed and raise and lower the window milling cone 2-3 times to repeatedly adjust the window, trying to avoid starting the turntable between the upper and lower windows. At the position where there may be obstruction, rotate the window at high speed to adjust the window until the obstruction does not exceed 10-20KN (ideally, there should be no obstruction when raising and lowering).

[0067] (7) After the window repair is completed, continue to complete the above operations to complete all window opening operations, and remove the window opening milling cone.

[0068] For those skilled in the art, various corresponding changes and modifications can be made based on the above technical solutions and concepts, and all such changes and modifications should be included within the protection scope of the claims of this utility model.

Claims

1. A sealing and window-opening integrated guide device, characterized in that, The device comprises, from top to bottom, a milling cone, a guide vane, a hydraulic support slip assembly, a release sub, and a permanent packer. The hydraulic support slip assembly includes a guide vane anchoring slip and a guide vane support slip. The upper end of the release sub is threadedly connected to the lower end of the guide vane support slip. The milling cone and the guide vane are connected by a pin. A capillary tube is connected to the upper end of the guide vane. The guide vane, the hydraulic support slip assembly, the release sub, and the permanent packer are interconnected. The permanent packer includes an upper connector, a central tube, slip 1, cone 1, back ring 1, rubber sleeve, back ring 2, cone 2, slip 2, locking ring, cylinder liner, piston, and guide shoe; the upper end of the upper connector is connected to the lower end of the release section, and the lower end of the upper connector is connected to the upper end of the central tube; the guide shoe is connected to the lower end of the central tube; slip 1, cone 1, back ring 1, rubber sleeve, back ring 2, cone 2, slip 2, locking ring, cylinder liner, and piston are all fitted onto the outside of the central tube; The piston is axially movable within the cylinder liner. The surface of the central tube has a pressure-transmitting hole communicating with the interior of the cylinder liner. The pressure-transmitting hole is located below the piston. The upper and lower ends of the rubber sleeve abut against cone one and cone two, respectively. The tapered ends of cone one and cone two are respectively engaged with the inner rings of slip one and slip two. The upper end of the piston can abut against slip two through axial movement, and at this time, the locking ring locks the piston. Slip one abuts against the upper connector. The guide vane anchoring slip and the guide vane support slip are respectively the axial slip and the transverse slip.

2. The integrated sealing and windowing guide device according to claim 1, characterized in that, The upper end of the rubber tube and the cone one, and the lower end of the rubber tube and the cone two, are respectively provided with the back ring one and the back ring two.

3. The integrated sealing and window-opening guide device according to claim 1, characterized in that, The guide vane support includes an inner tube and an outer tube. An expansion cone and a vane are positioned between the inner and outer tubes. Both the expansion cone and the vane are fitted onto the outside of the inner tube, and the conical end of the expansion cone is fixed to the inner ring of the vane by a pin. The surface of the outer tube has a window corresponding to the position of the vane, and the vane is embedded in the window. A spacer is fitted onto the outside of the inner tube, located below the expansion cone. A pressurized liquid input channel is formed between the top surface of the spacer and the bottom surface of the expansion cone. This pressurized liquid input channel has a connection with the inner tube. A connecting port is provided; a receiving space is formed below the partition, the receiving space has an opening communicating with the inner tube, and a switch valve body is provided in the receiving space, the switch valve body is used to block the lower end of the inner tube; the upper end of the release section is threadedly connected to the lower end of the outer tube; an isolation tube is also sleeved inside the inner tube, and the isolation tube blocks the connection between the pressurized liquid input channel and the inner tube, as well as the opening between the receiving space and the inner tube; the lower end of the isolation tube extends into the inside of the release section and is fixedly connected to it.

4. The integrated sealing and windowing guide device according to claim 1, characterized in that, The locking ring is a ratchet locking ring.

5. The integrated sealing and window-opening guide device according to claim 1, characterized in that, The upper connector and cylinder liner have the same maximum outer diameter, and the upper connector is larger than the outer diameter of the first and second slips and the rubber sleeve.

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