Multi-hole penetrating large-inner-diameter mechanical packer

Abstract

The utility model discloses a multi-hole penetrating large-inner-diameter mechanical packer which comprises a central pipe, a connecting sleeve, a rubber sleeve assembly and an anchoring mechanism, a penetrating hole is formed in the central pipe in the axis direction, a reversing groove is formed in the outer wall of the central pipe in the radial direction, and the outer diameter of the connecting sleeve is smaller than that of the central pipe. The bottom end of the connecting sleeve is fixedly arranged on the inner wall of the central pipe in a sleeving mode, the rubber sleeve assembly and the anchoring mechanism are adjacently arranged on the outer wall of the central pipe in a sleeving mode, an inner ring and an outer ring are arranged on the inner wall of the anchoring mechanism, the inner ring and the outer ring are coaxially arranged and sleeved with a guide pin, and the guide pin is movably embedded in a reversing groove. The multi-time setting and unsetting capability is realized; through the arrangement of the inner ring and the outer ring, when the guide pin moves in the reversing groove, rotation of the center pipe during setting and unsetting is avoided; due to the arrangement of the through holes, the cable, the water injection pipeline and the gas injection pipeline can penetrate through the through holes, and underground equipment and a detection tool are effectively connected.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas well development technology, specifically to a multi-hole through-hole large-diameter mechanical packer. Background Technology

[0002] As oil exploration and development deepen, it has become increasingly clear that oil reservoirs generally exhibit multi-layered characteristics. Within these multi-layered reservoirs, significant differences exist in physical properties such as pressure, permeability, and oil saturation among the various oil layers. To effectively improve oil recovery and achieve refined development of different oil layers, it is essential to separate these layers. This allows for operations such as stratified water injection, stratified oil production, and stratified fracturing. Against this backdrop, mechanical packers have emerged, effectively isolating different oil layers to meet the technological requirements of stratified extraction, as illustrated in authorization announcement number CN215907812U. The utility model patent entitled "A Mechanical Packer" includes a drive tube, a sealing assembly, and a locking mechanism. The sealing assembly and locking mechanism are located on the upper part of the drive tube. The drive tube is a cylindrical cavity structure with open ends, and a drive rod is installed inside the drive tube. One end of the drive rod is connected to the locking mechanism. The locking mechanism includes a pressing platform, a sliding plate, a telescopic rod, and a limiting plate fixed on the drive rod. The sliding plate is fixed to the outer wall of the drive tube through the telescopic rod, and several limiting plates are provided on the sliding plate. The sealing assembly is a flexible rubber sleeve, and the sealing assembly is provided with at least three seals, which solves the problem of easy detachment of existing water-filled packers when they are seated and locked.

[0003] However, the aforementioned mechanical packers have obvious limitations in practical applications. Due to the limitations of their own structural characteristics, they are difficult to effectively connect downhole equipment and testing tools. Moreover, the connection of the cable is often pulled by the rotation of the central tube during setting and unsetting, which can lead to problems such as damage to the cable insulation and conductor breakage, thus failing to meet the requirements of collaborative operations. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a multi-hole through-hole large inner diameter mechanical packer to solve the technical problem in the prior art where the rotation of the central tube during the setting and unsetting of the packer causes the connected cable to be pulled, resulting in damage to the cable insulation layer and breakage of the conductor.

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

[0006] This utility model provides a multi-hole through-hole mechanical packer with a large inner diameter, including a central tube, a connecting sleeve, a rubber sleeve assembly, and an anchoring mechanism. The central tube has a through-hole in the axial direction and a reversing groove in the radial direction of the outer wall. The outer diameter of the connecting sleeve is smaller than the outer diameter of the central tube. The connecting sleeve is located at the top of the central tube, and the bottom end of the connecting sleeve is fixedly sleeved on the inner wall of the central tube. The rubber sleeve assembly is sleeved adjacent to the anchoring mechanism on the outer wall of the central tube. The inner wall of the anchoring mechanism has an inner ring and an outer ring. The inner ring and the outer ring are coaxially arranged and fitted with a guide pin. The guide pin is movably embedded in the reversing groove.

[0007] In some embodiments, the anchoring mechanism includes a cone, a slip, a symmetrical leaf spring, a slip retaining ring, a friction block traction body, a friction block, a rectangular compression spring, a friction block retaining ring, and a retaining ring. The cone, the slip, the symmetrical leaf spring, the slip retaining ring, the friction block traction body, the friction block, the rectangular compression spring, the friction block retaining ring, and the retaining ring are sequentially sleeved on the outer wall of the central tube from top to bottom.

[0008] In some embodiments, an upper guide ring is installed at the top of the rubber sleeve assembly.

[0009] In some embodiments, a lower guide ring is installed between the bottom end of the rubber sleeve assembly and the anchoring mechanism.

[0010] In some embodiments, a groove is provided between the lower guide ring and the central tube, a protrusion is provided on the outer wall of the central tube, the protrusion is slidably embedded in the groove, and a shear pin is provided between the protrusion and the lower guide ring.

[0011] In some embodiments, straight connectors are installed at both ends of the through hole.

[0012] In some embodiments, the outer wall of the connecting sleeve is provided with a first clearance groove.

[0013] In some embodiments, a second clearance groove is provided at the bottom end of the central tube.

[0014] In some embodiments, an upper connector is fixedly connected to the top end of the connecting sleeve.

[0015] In some embodiments, a lower connector is fixedly connected to the bottom end of the central tube.

[0016] Compared with existing technologies, this utility model provides a multi-hole through-hole large-diameter mechanical packer. Through the setting of reversing grooves and guide pins, it has the ability to set and unseal multiple times, and can achieve temporary sealing at designated locations downhole, meeting the needs of flexible control and operation of different oil layers in complex oil reservoir development. Through the setting of inner and outer rings, when the guide pin moves in the reversing groove, the guide pin drives the inner and outer rings to rotate, and the central tube only needs to move up and down, solving the problem of the central tube rotating during setting and unsealing, thus avoiding the problem of cable breakage. Through the setting of through holes, the cable, water injection, and gas injection pipelines can pass through, effectively connecting downhole equipment and detection tools. With one string of construction, operations can be carried out at different locations to carry out various measures such as production enhancement and leak detection, saving a lot of manpower, material resources and time costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a multi-hole through-hole large-diameter mechanical packer provided in this embodiment of the utility model. Figure 1 (Initial state);

[0018] Figure 2 yes Figure 1 Sectional view of AA;

[0019] Figure 3 yes Figure 1 Schematic diagram of the reversing slot in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of a multi-hole through-hole large-diameter mechanical packer provided in this embodiment of the utility model. Figure 2 (Seated state).

[0021] Explanation of reference numerals in the attached drawings: 1. Central tube; 11. Through hole; 111. Straight connector; 12. Reversing groove; 13. Protrusion; 131. Shear pin; 14. Second clearance groove; 2. Connecting sleeve; 21. First clearance groove; 3. Rubber sleeve assembly; 31. Upper guide ring; 32. Lower guide ring; 321. Slide groove; 4. Anchoring mechanism; 41. Cone; 42. Slip; 43. Symmetrical leaf spring; 44. Slip retaining ring; 45. Friction block traction body; 46. Friction block; 47. Rectangular surface compression spring; 48. Friction block retaining ring; 49. Retaining ring; 5. Inner ring; 6. Outer ring; 7. Guide pin; 8. Upper connector; 9. Lower connector. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present utility model and are not intended to limit the present utility model.

[0023] To address the technical problem that rotating the central tube during the setting and unsetting of a packer causes the connected cable to be pulled, resulting in damage to the cable's insulation and breakage, this invention provides a multi-hole through-hole mechanical packer with a large inner diameter, which can avoid problems such as cable breakage.

[0024] It should be noted that the multi-hole through-hole large-diameter mechanical packer described in this utility model is used in, but not limited to, oil and gas wells. For ease of explanation, this utility model only uses the application of a multi-hole through-hole large-diameter mechanical packer in an oil and gas well as an example for illustration. The principle of applying a multi-hole through-hole large-diameter mechanical packer to other types of equipment is essentially the same as that applied to oil and gas wells, and will not be elaborated here.

[0025] Please see Figure 1 - Figure 4 ,in Figure 1 This is a schematic diagram of the structure of a multi-hole through-hole large-diameter mechanical packer according to an embodiment of the present invention. The multi-hole through-hole large-diameter mechanical packer includes a central tube 1, a connecting sleeve 2, a rubber sleeve assembly 3, and an anchoring mechanism 4. The central tube 1 has a through hole 11 in the axial direction and a reversing groove 12 in the radial direction of the outer wall of the central tube 1. The outer diameter of the connecting sleeve 2 is smaller than the outer diameter of the central tube 1. The connecting sleeve 2 is located at the top of the central tube 1, and the bottom end of the connecting sleeve 2 is fixedly sleeved on the inner wall of the central tube 1. The rubber sleeve assembly 3 and the anchoring mechanism 4 are sleeved adjacent to each other on the outer wall of the central tube 1. The inner wall of the anchoring mechanism 4 has an inner ring 5 and an outer ring 6. The inner ring 5 and the outer ring 6 are coaxially arranged and fitted with a guide pin 7. The guide pin 7 is movably embedded in the reversing groove 12.

[0026] In this embodiment, the reversing groove 12 and guide pin 7 enable multiple setting and unsetting capabilities, allowing for temporary sealing at designated downhole locations. This meets the needs of flexible control and operation of different oil layers in complex reservoir development. The inner ring 5 and outer ring 6 allow the guide pin 7 to rotate within the reversing groove 12, while the central tube 1 only needs to move up and down. This solves the problem of the central tube 1 rotating during setting and unsetting, thus avoiding cable breakage. The through hole 11 facilitates the passage of cables, water injection, and gas injection pipelines, effectively connecting downhole equipment and testing tools. With a single tubing string operation, work can be carried out at different locations to perform various measures such as increasing production and finding leaks, saving significant manpower, material resources, and time costs.

[0027] It should be noted that the matching re-sealing rubber sleeve assembly 3 is included.

[0028] Furthermore, the number of through holes 11 is set to several, allowing cables, control lines, or water and gas pipes to pass through simultaneously without interfering with the central pipe 1. This makes the packer more flexible in its application conditions and allows for monitoring of well conditions below the packer while sealing the annulus, making construction safer.

[0029] Furthermore, the reversing groove 12 has a short slide rail groove and a long slide rail groove. When the packer is lowered into the well, the guide pin 7 needs to be adjusted to the dead point position on the short slide rail groove. The slip 42 is fixed on the central tube 1 by the rectangular compression spring 47 to ensure smooth lowering into the well.

[0030] Furthermore, the inner diameter of the connecting sleeve 2 is the same as the inner diameter of the central pipe 1, which facilitates the implementation of a large inner diameter design to increase the production of oil and gas.

[0031] In one embodiment, the anchoring mechanism 4 includes a cone 41, a slip 42, a symmetrical leaf spring 43, a slip retaining ring 44, a friction block traction body 45, a friction block 46, a rectangular compression spring 47, a friction block retaining ring 48, and a retaining ring 49. The cone 41, slip 42, symmetrical leaf spring 43, slip retaining ring 44, friction block traction body 45, friction block 46, rectangular compression spring 47, friction block retaining ring 48, and retaining ring 49 are sequentially sleeved on the outer wall of the central tube 1 from top to bottom.

[0032] In this embodiment, the friction block traction body 45, friction block 46, friction block retaining ring 48, and rectangular compression spring 47 form a friction part, which, together with the special reversing groove 12 design on the central tube 1, achieves the function of pushing the slip 42 to anchor and squeezing the rubber tube assembly 3.

[0033] The slip retaining ring 44 is connected to the friction block traction body 45 by a set screw. During the unsealing stage of the packer, the elastic force of the symmetrical leaf spring 43 can help the slip 42 to smoothly detach from the well wall and re-fit tightly onto the central tube 1.

[0034] The friction block traction body 45 and the retaining ring 49 are connected by threads to fix the relative position of the guide pin 7, so that when the central tube 1 is lifted up and pressed down, the guide pin 7 is adjusted in the reversing groove 12 according to the design requirements without affecting the central tube 1.

[0035] Furthermore, when unsealing is required, lift the central tube 1, release the anchor of the slip 42, retract the rubber sleeve assembly 3, continue to lift it to adjust the guide pin 7 to the switching position at the lower end of the reversing groove 12, and then press the central tube 1 down. At this time, the guide pin 7 is adjusted to the end of the short slide rail groove. Then it returns to the initial state. The above requirements can be repeated as needed to achieve the requirement of repeated setting and temporary sealing.

[0036] In one embodiment, an upper guide ring 31 is mounted on the top of the rubber sleeve assembly 3.

[0037] In this embodiment, the upper guide ring 31 and the central tube 1 are fixedly connected by an internal hexagonal cone-shaped set screw. The function of the upper guide ring 31 is to abut against the top of the rubber tube assembly 3, so that the rubber tube assembly 3 can be compressed and sealed.

[0038] In one embodiment, a lower guide ring 32 is installed between the bottom end of the rubber sleeve assembly 3 and the anchoring mechanism 4.

[0039] In this embodiment, the lower guide ring 32 is used in conjunction with the upper guide ring 31 to jointly compress the rubber cylinder assembly 3 to achieve setting and sealing.

[0040] In one embodiment, a groove 321 is provided between the lower guide ring 32 and the central tube 1, and a protrusion 13 is provided on the outer wall of the central tube 1. The protrusion 13 is slidably embedded in the groove 321, and a shear pin 131 is provided between the protrusion 13 and the lower guide ring 32.

[0041] In this embodiment, when the packer is lowered to the designated position, the central tube 1 is lifted. Due to the friction between the friction block 46 and the sleeve, the guide pin 7 is adjusted to the designated position at the lower end of the reversing groove 12. The central tube 1 is then pressed down, and the guide pin 7 is adjusted along the path of the reversing groove 12. The central tube 1 is then pressed down further, and the slip 42 opens and engages with the inner wall of the sleeve. The shear pin 131 is sheared, and at this time, the rubber sleeve assembly 3 is squeezed and expanded, completing the setting seal requirement.

[0042] Furthermore, the lower guide ring 32 is threadedly fixed to the cone 41, and the protrusion 13 abuts against the lower guide ring 32 to achieve recycling.

[0043] In one embodiment, straight connectors 111 are installed at both ends of the through hole 11.

[0044] In one embodiment, the outer wall of the connecting sleeve 2 is provided with a first clearance groove 21.

[0045] In one embodiment, a second clearance groove 14 is provided at the bottom end of the central tube 1.

[0046] In this embodiment, the function of the first clearance groove 21 and the second clearance groove 14 is to free up more space to facilitate the installation of the straight connector 111 and avoid interference between the straight connector 111 and the connecting sleeve 2 or the central tube 1.

[0047] In one embodiment, the top end of the connecting sleeve 2 is fixedly connected to the upper connector 8.

[0048] In this embodiment, the upper connector 8 is used to connect the tool above, and an O-ring and an O-ring back ring are provided between the connecting sleeve 2 and the upper connector 8 to improve the sealing performance.

[0049] In one embodiment, a lower connector 9 is fixedly connected to the bottom end of the central tube 1.

[0050] In this embodiment, the lower connector 9 is used to connect the tool below, and an O-ring and an O-ring back ring are also provided between the central tube 1 and the lower connector 9 to improve the sealing performance.

[0051] To better understand this utility model, the following is combined with... Figures 1 to 4 The technical solution of this utility model is described in detail below:

[0052] During setting: When the packer reaches the designated position, the central tube 1 is lifted. At this time, the friction block 46 squeezes the sleeve under the action of the rectangular compression spring 47 to generate friction. The friction block traction body 45 and the retaining ring 49 limit the relative position of the guide pin 7. The guide pin 7, outer ring 6, and inner ring 5 play a guiding role, causing it to rotate around the central axis of the central tube 1 within the limited position. Under the combined action, the guide pin 7 and the reversing groove 12 move relative to each other until the guide pin 7 reaches the specified position at the lower end of the reversing groove 12. Press down on the central tube 1 section again, so that the rotating adjusting guide pin 7 moves to the end of the long slide rail and moves relative to the long slide rail groove. Then press down on the central tube 1 section again, so that the weight of the central tube 1 section presses on the packer. The slip 42 and the cone 41 move relative to each other. The slip 42 opens and bites on the inner wall of the sleeve. The shear pin 131 is sheared. The upper guide ring 31 and the lower guide ring 32 together squeeze the rubber sleeve assembly 3, so that the rubber sleeve assembly 3 is compressed and set, sealing the annular space of the oil sleeve.

[0053] During unsealing: Lifting the central tube 1 section causes the friction block 46 to squeeze the sleeve, generating friction in the opposite direction, which causes the guide pin 7 to move relative to the long slide rail groove. At this time, the compressed rubber sleeve assembly 3 is released and retracts due to its own tension. The cone 41 is also released, and the slip 42 is released from its anchoring state by the elastic force of the symmetrical plate spring 43. Continue to lift the central tube 1 until the guide pin 7 reaches the specified position at the lower end of the reversing groove 12. Then press the central tube 1 section down to adjust the guide pin 7 to the end of the short slide rail groove. At this time, it returns to the initial position. The setting position of the packer can be adjusted according to the needs.

[0054] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A porous through-the-casing mechanical packer, characterized by, include: A central tube has a through hole in the axial direction and a reversing groove in the radial direction of the outer wall of the central tube. A connecting sleeve, the outer diameter of which is smaller than the outer diameter of the central tube, the connecting sleeve being located at the top of the central tube, and the bottom end of which is fixedly fitted onto the inner wall of the central tube; Rubber cartridge assembly; and An anchoring mechanism, wherein the rubber sleeve assembly is sleeved adjacent to the anchoring mechanism on the outer wall of the central tube, the inner wall of the anchoring mechanism is provided with an inner ring and an outer ring, the inner ring and the outer ring are coaxially arranged and fitted with a guide pin, the guide pin being movably embedded in the reversing groove.

2. A large bore mechanical packer for use in a multi-zone wellbore, according to claim 1, wherein, The anchoring mechanism includes a cone, a slip, a symmetrical leaf spring, a slip retaining ring, a friction block traction body, a friction block, a rectangular compression spring, a friction block retaining ring, and a retaining ring. The cone, the slip, the symmetrical leaf spring, the slip retaining ring, the friction block traction body, the friction block, the rectangular compression spring, the friction block retaining ring, and the retaining ring are sequentially sleeved on the outer wall of the central tube from top to bottom.

3. The large bore mechanical packer for use in slotted holes according to claim 1, wherein, An upper guide ring is installed at the top of the rubber sleeve assembly.

4. The large bore mechanical packer for use in slotted holes according to claim 1, wherein, A lower guide ring is installed between the bottom end of the rubber sleeve assembly and the anchoring mechanism.

5. A multi-hole through-hole large-inner-diameter mechanical packer according to claim 4, characterized in that, A groove is provided between the lower guide ring and the central tube. The outer wall of the central tube is provided with a protrusion. The protrusion is slidably embedded in the groove, and a shear pin is provided between the protrusion and the lower guide ring.

6. A multi-hole through-hole large-inner-diameter mechanical packer according to claim 1, characterized in that, Both ends of the through hole are equipped with straight connectors.

7. A multi-hole through-hole large-inner-diameter mechanical packer according to claim 1, characterized in that, The outer wall of the connecting sleeve is provided with a first clearance groove.

8. The large bore mechanical packer of claim 1, wherein, A second clearance groove is provided at the bottom end of the central tube.

9. The large bore mechanical packer of claim 1, wherein, The top end of the connecting sleeve is fixedly connected to an upper connector.

10. The large bore mechanical packer of claim 1, wherein, The bottom end of the central tube is fixedly connected to a lower connector.

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