Hydraulic setting packer

Abstract

The utility model provides a hydraulic setting packer which comprises a middle mandrel, and the periphery of the middle mandrel is sequentially sleeved with a counter-force assembly, an upper slip assembly, a rubber sleeve assembly, a lower slip assembly and a piston assembly from top to bottom. The piston assembly is used for pushing the lower slip assembly, the rubber sleeve assembly and the upper slip assembly to move upwards; the counter-force assembly is used for providing counter-force to the upper slip assembly; the upper slip assembly and the lower slip assembly are arranged in opposite directions. The upper slip assembly and the lower slip assembly which are arranged in the opposite directions can be anchored in the upward direction and the downward direction, mistaken unsealing and sealing losing of the packer are avoided, and the construction requirements of fracturing, acidification and the like are met.

Description

Technical Field

[0001] This utility model belongs to the field of packer technology, and more specifically, relates to a hydraulic setting packer. Background Technology

[0002] Packers are indispensable tools in oil and gas well operations, widely used in drilling, completion, well testing, and workover. Their core function is to create a seal in the annulus between the tubing and casing through a specific structure and mechanism, enabling various processes such as stratified production, stratified water injection, and stratified fracturing. This is of paramount importance for improving oil and gas well production efficiency, optimizing production management, and ensuring the safe and stable operation of oil and gas wells. Traditional packer technology typically employs a unidirectional anchoring structure. This type of packer can only withstand unidirectional forces; that is, it can maintain stable anchoring and achieve a seal when force is applied in a specific direction (such as upward or downward). However, in complex oil and gas well operating environments, especially during special construction processes such as fracturing and acidizing, the pressure changes within the well are complex, and the direction of the force may also change. In such cases, unidirectional anchoring packers are prone to mis-sealing and loss of seal. Mis-sealing refers to the packer unexpectedly releasing itself before the designed release conditions are met, leading to seal failure; unsealing refers to the packer failing to maintain a seal under normal operating conditions, resulting in leakage. These problems not only affect the smooth progress of oil and gas well operations and reduce construction efficiency, but may also lead to the waste of oil and gas resources and even cause downhole safety accidents, resulting in serious economic losses and safety hazards in oil and gas extraction. With the continuous development of oil and gas extraction technology and the increasing complexity of oil and gas well operating environments, higher requirements are placed on the performance of packers. There is an urgent need for a packer that can adapt to complex working conditions and has a bidirectional anchoring function to effectively solve the problems of mis-sealing and unsealing of existing packers, thereby better meeting the needs of various construction processes in oil and gas wells and ensuring the safe, efficient, and stable operation of oil and gas wells. Based on the above background, this utility model aims to provide a hydraulically set packer that, through its unique structural design and working principle, achieves a bidirectional anchoring function, effectively avoiding the occurrence of mis-sealing and unsealing, and providing a more reliable sealing and anchoring solution for complex oil and gas well operations. Utility Model Content

[0003] The purpose of this invention is to provide a hydraulic setting packer that solves the problems of mis-sealing and failure to seal in existing packers.

[0004] To achieve the above objectives, this utility model provides a hydraulic setting and sealing packer, including a central core shaft, which is a hollow structure. From top to bottom, a reaction force assembly, an upper slip assembly, a rubber sleeve assembly, a lower slip assembly, and a piston assembly are sequentially fitted around the outer periphery of the central core shaft.

[0005] The piston assembly is used to push the lower slip assembly, the rubber sleeve assembly, and the upper slip assembly upward;

[0006] The reaction force component is at least partially fixedly connected to the central spindle and is used to provide a reaction force to the upper slip component;

[0007] The upper slip assembly and the lower slip assembly are positioned in opposite directions.

[0008] Optionally, the upper chuck assembly includes:

[0009] The upper slip sleeve, the upper end of which abuts against the reaction force component;

[0010] Multiple upper spring pieces are disposed at the lower part of the upper slip sleeve and distributed around the central core shaft;

[0011] Multiple upper slips, the upper ends of which are respectively connected to multiple upper spring pieces;

[0012] An upper cone is disposed below a plurality of upper slips, with the cone-shaped end of the upper cone facing upward.

[0013] Optionally, the lower chock assembly includes:

[0014] The lower slip sleeve, the lower end of which is connected to the piston assembly in a transmission manner;

[0015] Multiple lower spring pieces are disposed on the upper part of the lower slip sleeve and distributed around the central core shaft;

[0016] Multiple lower slips, the lower ends of which are respectively connected to multiple lower spring pieces;

[0017] A lower cone is disposed above a plurality of lower slips, with the cone-shaped end of the lower cone pointing downwards;

[0018] A first one-way locking component is provided between the lower cone and the central mandrel, which enables the lower cone to move only upward relative to the central mandrel and prevents it from moving downward.

[0019] Optionally, the piston assembly includes:

[0020] A piston cylinder is connected to the central mandrel via a release shear pin, and a piston chamber is formed between the piston cylinder and the central mandrel;

[0021] A piston head is disposed within the piston chamber. The outer side of the piston head is sealed and slidably connected to the inner wall of the piston cylinder, and the inner side of the piston head is sealed and slidably connected to the outer wall of the central mandrel.

[0022] The piston tail has its lower end fixedly connected to the piston head, and its upper end extends to the outside of the piston cavity and is drivenly connected to the lower slip assembly.

[0023] The central mandrel is provided with a pressure transmission hole, which connects the central mandrel and the piston chamber, and the pressure transmission hole is lower than the piston head.

[0024] Optionally, the outer wall of the piston cylinder is provided with a pressure relief hole, which is higher than the piston head.

[0025] Optionally, a second one-way locking assembly is provided between the piston tail and the piston cylinder, the second one-way locking assembly being used to ensure that the piston tail can only move upward relative to the piston cylinder and cannot move downward.

[0026] Optionally, both the upper and lower locking components are connected to the central mandrel via actuation shear pins.

[0027] Optionally, the rubber sleeve assembly includes a first rubber sleeve, a second rubber sleeve, and a third rubber sleeve arranged sequentially from top to bottom.

[0028] Optionally, the reaction force component includes:

[0029] Guide ring, which is fixedly connected to the central mandrel;

[0030] A mudguard ring, which is fixedly connected to the guide ring;

[0031] A fixing ring is fixedly connected to the mudguard ring;

[0032] The key block has two ends that abut against the fixing ring and the upper locking assembly, respectively.

[0033] Optionally, the piston assembly and the lower slip assembly are connected by a connecting sleeve.

[0034] The beneficial effects of this utility model are as follows: It provides a hydraulic setting packer, including a central shaft. From top to bottom, a reaction force assembly, an upper slip assembly, a rubber sleeve assembly, a lower slip assembly, and a piston assembly are sequentially fitted around the outer circumference of the central shaft. The piston assembly is used to push the lower slip assembly, the rubber sleeve assembly, and the upper slip assembly upwards. The reaction force assembly provides a reaction force to the upper slip assembly. The upper and lower slip assemblies are arranged in opposite directions. The upper and lower slip assemblies, arranged in opposite directions, can be anchored in both upward and downward directions, preventing mis-sealing and loss of seal, and meeting the requirements of fracturing, acidizing, and other construction operations.

[0035] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0036] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally represent like parts.

[0037] Figure 1 A schematic structural diagram of the hydraulic setting packer according to Embodiment 1 of this utility model is shown.

[0038] Figure 2 A schematic structural diagram of the reaction component according to Embodiment 1 of this utility model is shown.

[0039] Figure 3 A schematic structural diagram of the upper clasp assembly according to Embodiment 1 of this utility model is shown.

[0040] Figure 4 A schematic structural diagram of the rubber sleeve assembly according to Embodiment 1 of this utility model is shown.

[0041] Figure 5 A schematic structural diagram of the lower locking component of Embodiment 1 of this utility model is shown.

[0042] Figure 6 A schematic structural diagram of the piston assembly according to Embodiment 1 of this utility model is shown.

[0043] Explanation of reference numerals in the attached figures:

[0044] 1. Central spindle;

[0045] 2. Reaction component; 21. Guide ring; 22. Mudguard ring; 23. Fixing ring; 24. Key block;

[0046] 3. Upper slip assembly; 31. Upper slip sleeve; 32. Upper spring clip; 33. Upper slip; 34. Upper cone;

[0047] 4. Glue cartridge assembly; 41. First glue cartridge; 42. Second glue cartridge; 43. Third glue cartridge;

[0048] 5. Lower slip assembly; 51. Lower slip sleeve; 52. Lower spring; 53. Lower slip; 54. Lower cone; 55. First one-way locking assembly;

[0049] 6. Connecting sleeve;

[0050] 7. Piston assembly; 71. Piston cylinder; 72. Piston chamber; 72a. Pressure transmission port; 72b. Pressure relief port; 73. Piston head; 73a. Outer sealing ring; 73b. Outer support ring; 73c. ​​Inner sealing ring; 73d. Inner support ring; 74. Piston tail; 75. Second one-way locking assembly;

[0051] 8. Start the bolt cutter;

[0052] 9. Unseal the nails. Detailed Implementation

[0053] Preferred embodiments of the present invention will now be described in more detail. While preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0054] Example 1

[0055] like Figure 1 As shown, this embodiment provides a hydraulic setting packer, including a central core shaft 1, which is a hollow structure. The outer periphery of the central core shaft 1 is sequentially fitted with a reaction force assembly 2, an upper slip assembly 3, a rubber sleeve assembly 4, a lower slip assembly 5, and a piston assembly 7 from top to bottom.

[0056] Piston assembly 7 is used to push the lower slip assembly 5, rubber sleeve assembly 4 and upper slip assembly 3 upward;

[0057] The reaction force assembly 2 is at least partially fixedly connected to the central spindle 1 and is used to provide a reaction force to the upward slip assembly 3;

[0058] The upper slip assembly 3 and the lower slip assembly 5 are set in opposite directions.

[0059] In practice, after the hydraulic setting packer is lowered to the designed setting position, hydraulic pressure is applied to the piston assembly 7, the piston assembly 7 extends, and the piston assembly 7 drives the lower slip assembly 5, the rubber sleeve assembly 4 and the upper slip assembly 3 to move upward. The rubber sleeve assembly 4 is squeezed and expands to achieve setting, and the lower slip assembly 5 and the upper slip assembly 3 are squeezed and expand outward and jam against the sleeve wall to achieve anchoring.

[0060] Specifically, the upper slip assembly 3 and the lower slip assembly 5 are set in opposite directions, which can anchor the hydraulic setting packer in both the upward and downward directions, avoiding mis-sealing and loss of the packer, and meeting the construction requirements of fracturing, acidizing and other operations.

[0061] Optionally, such as Figure 3 As shown, the upper cladding assembly 3 includes:

[0062] Upper slip sleeve 31, the upper end of upper slip sleeve 31 abuts against reaction force component 2;

[0063] Multiple upper spring pieces 32 are disposed at the lower part of the upper slip sleeve 31 and distributed around the central core shaft 1;

[0064] Multiple upper slips 33, the upper ends of which are connected to multiple upper spring pieces 32 respectively;

[0065] The upper cone 34 is located below the plurality of upper slips 33, with the cone-shaped end of the upper cone 34 facing upward;

[0066] Specifically, the upper cone 34 is used to fit into the gap between the upper slip 33 and the central spindle 1 to expand the multiple upper slips 33; the upper spring 32 is used to provide elastic force to the upper slips 33, and when the upper slips 33 are not subjected to external force, the upper spring 32 causes the multiple upper slips 33 to retract.

[0067] Optionally, such as Figure 5 As shown, the lower chuck assembly 5 includes:

[0068] The lower slip sleeve 51 is connected to the piston assembly 7 via a transmission connection at its lower end.

[0069] Multiple lower spring clips 52 are disposed on the upper part of the lower slip sleeve 51 and distributed around the central core shaft 1;

[0070] Multiple lower slips 53, the lower ends of which are connected to multiple lower spring pieces 52 respectively;

[0071] The lower cone 54 is disposed above the plurality of lower slips 53, with the cone-shaped end of the lower cone 54 facing downward;

[0072] A first one-way locking component 55 is provided between the lower cone 54 and the central spindle 1. The first one-way locking component 55 ensures that the lower cone 54 can only move upward relative to the central spindle 1 and cannot move downward.

[0073] Specifically, the lower cone 54 is used to fit into the gap between the lower slip 53 and the central spindle 1 to expand the multiple lower slips 53; the lower spring tab 52 provides elastic force to the lower slips 53. The first one-way locking assembly 55 can prevent the rubber sleeve assembly 4 from springing back, avoiding mis-sealing or loss of seal. The first one-way locking assembly 55 can be implemented using existing technology, such as a ratchet structure.

[0074] Optionally, such as Figure 6 As shown, piston assembly 7 includes:

[0075] Piston cylinder 71 is connected to central spindle 1 via unsealing shear pin 9, and a piston chamber 72 is formed between piston cylinder 71 and central spindle 1.

[0076] Piston head 73 is disposed in piston chamber 72. The outer periphery of piston head 73 is sealed and slidably connected to the inner periphery of piston cylinder 71. The inner periphery of piston head 73 is sealed and slidably connected to the outer periphery of central spindle 1.

[0077] The piston tail 74 has its lower end fixedly connected to the piston head 73, and its upper end extends to the outside of the piston chamber 72 and is connected to the lower slip assembly 5 in a driving connection.

[0078] The central spindle 1 is provided with a pressure transmission hole 72a, which connects the central spindle (1) and the piston chamber 72. The pressure transmission hole 72a is lower than the piston head 73.

[0079] Specifically, the pressure transmission hole 72a is used to introduce hydraulic pressure from the mandrel 1 into the piston chamber 72, pushing the piston head 73 upward, and the piston tail 74 pushing the lower slip assembly 5, the rubber sleeve assembly 4, and the upper slip assembly 3 to compress. The release pin 9 is used for the release operation, and its strength and number can be set according to the required release pull force. During release, lifting the mandrel 1 beyond the set release pull force causes the release pin 9 to shear, giving the upper slip assembly 3, the rubber sleeve assembly 4, the lower slip assembly 5, and the piston cylinder 71 space to move downward relative to the mandrel 1, restoring their free state. The rubber sleeve assembly 4 springs back, and the upper and lower slip assemblies 3 and 5 are retracted, completing the release action. Continuing to lift allows for the retrieval of the completion tubing and the hydraulic setting packer. If lifting to release fails, release can also be achieved by cutting the lower part of the mandrel 1.

[0080] Optionally, the outer wall of the piston cylinder 71 is provided with a pressure relief hole 72b, which is higher than the piston head 73.

[0081] Specifically, the pressure relief hole 72b makes it less likely for the piston chamber 72 to form a closed pressure space, causing accidental damage to the mechanism parts, and is suitable for well environments with great depth and high mud density.

[0082] Optionally, a second one-way locking assembly 75 is provided between the piston tail 74 and the piston cylinder 71. The second one-way locking assembly 75 is used to ensure that the piston tail 74 can only move upward relative to the piston cylinder 71 and cannot move downward.

[0083] Specifically, the second one-way locking assembly 75 securely locks the hydraulic packer in the set position, preventing mis-sealing and loss of seal. The second one-way locking assembly 75 can be implemented using existing technology, such as a ratchet mechanism.

[0084] Optionally, both the upper slip assembly 3 and the lower slip assembly 5 are connected to the central spindle 1 via the actuation shear pin 8.

[0085] Specifically, the starting shear pin 8 temporarily secures the upper slip assembly 3 and the lower slip assembly 5, preventing them from shifting before setting. The strength and number of starting shear pins 8 can be set according to the required starting force. During setting, when the thrust of the piston assembly 7 reaches the set starting force, the starting shear pin 8 is sheared, and the upper slip assembly 3 and the lower slip assembly 5 return to a free state, achieving the anchoring function.

[0086] Optionally, such as Figure 4 As shown, the glue tube assembly 4 includes a first glue tube 41, a second glue tube 42 and a third glue tube 43 arranged from top to bottom.

[0087] Specifically, the three-sleeve structure has high pressure-bearing and sealing capabilities, with a maximum pressure of 105MPa.

[0088] Optionally, such as Figure 2 As shown, the reaction component 2 includes:

[0089] Guide ring 21, guide ring 21 is fixedly connected to the central spindle 1;

[0090] Mudguard ring 22, which is fixedly connected to guide ring 21;

[0091] Fixed ring 23, fixedly connected to mudguard ring 22;

[0092] Key block 24, with its two ends abutting against the fixing ring 23 and the upper locking assembly 3, respectively.

[0093] Optionally, the piston assembly 7 and the lower slip assembly 5 are connected by a connecting sleeve 6.

[0094] Example 2

[0095] The hydraulic setting packer structure in this embodiment is the same as that in Embodiment 1, except that the central mandrel 1 is made of Q125 steel and its inner diameter is set to 85.09mm. This reduces friction, prevents damage from buckling erosion, and correspondingly increases the acid fracturing displacement, thus improving the acid fracturing effect. The inner surface of the central mandrel 1 is electroplated with tungsten alloy to enhance its erosion resistance, meeting the requirements of large displacement and sand addition in acid fracturing design.

[0096] Example 3

[0097] The hydraulic setting packer structure in this embodiment is the same as that in Embodiment 1, except that: the piston head 73 is provided with an outer sealing ring 73a and an outer support ring 73b on its outer periphery. The outer sealing ring 73a and the outer support ring are used to achieve a sealed sliding connection between the piston head 73 and the piston cylinder 71. The piston head 73 is provided with an inner sealing ring 73c and an inner support ring 73d on its inner periphery. The inner sealing ring and the inner support ring 73d are used to achieve a sealed sliding connection between the piston head 73 and the central spindle 1.

[0098] Example 4

[0099] Taking a single appraisal well as an example, located in Sichuan, China, the well used the hydraulic packer described in this embodiment. The well was successfully lowered and set. Acid fracturing operation: 1926.48 m³ of fluid was injected. 3 Total net liquid volume: 1810.8m³ 3 Total sand volume: 155.81 m³3 Of which 12.1m is 70 / 140 mesh silt. 3 70 / 140 mesh ceramsite 93m 3 40 / 70 mesh ceramsite 50.71m 3 The overall sand-to-liquid ratio is 8.6%; the pre-acid treatment is 30m³. 3 50 temporary plugging knots (22 / 24mm); construction displacement 9-11.1m. 3 / min. The design is highly complete and meets the high compliance rate. The net liquid volume increased by 160.8m. 3 The amount of sand added increased by 24m 3 The construction displacement and pump pressure were completed according to the design, and the well was successfully unsealed, with all in-well test tubing and hydraulic packers removed.

[0100] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A hydraulic setting packer, characterized in that, Includes a central mandrel (1), which is a hollow structure. The outer periphery of the central mandrel (1) is fitted with a reaction force assembly (2), an upper slip assembly (3), a rubber sleeve assembly (4), a lower slip assembly (5), and a piston assembly (7) from top to bottom. The piston assembly (7) is used to push the lower slip assembly (5), the rubber sleeve assembly (4) and the upper slip assembly (3) upward; The reaction force assembly (2) is at least partially fixedly connected to the central spindle (1) and is used to provide a reaction force to the upper slip assembly (3); The upper slip assembly (3) and the lower slip assembly (5) are arranged in opposite directions.

2. The hydraulic setting packer according to claim 1, characterized in that, The upper cladding assembly (3) includes: Upper slip sleeve (31), the upper end of which abuts against the reaction force component (2); Multiple upper spring pieces (32) are disposed at the lower part of the upper slip sleeve (31) and distributed around the central core shaft (1); Multiple upper slips (33), the upper ends of the multiple upper slips (33) are respectively connected to the multiple upper spring pieces (32); An upper cone (34) is disposed below a plurality of upper clasps (33), with the cone-shaped end of the upper cone (34) facing upward.

3. The hydraulic setting packer according to claim 1, characterized in that, The lower slip assembly (5) includes: The lower slip sleeve (51) is connected to the piston assembly (7) via a transmission connection at its lower end. Multiple lower spring pieces (52) are disposed on the upper part of the lower slip sleeve (51) and distributed around the central core shaft (1); Multiple lower slips (53), the lower ends of the multiple lower slips (53) are respectively connected to the multiple lower spring pieces (52); The lower cone (54) is disposed above the plurality of lower latches (53), and the cone-shaped end of the lower cone (54) is disposed downward; A first one-way locking component (55) is provided between the lower cone (54) and the central spindle (1). The first one-way locking component (55) enables the lower cone (54) to move upward relative to the central spindle (1) but not downward.

4. The hydraulic setting packer according to claim 1, characterized in that, The piston assembly (7) includes: Piston cylinder (71), the piston cylinder (71) is connected to the central spindle (1) by unsealing shear pin (9), and a piston chamber (72) is formed between the piston cylinder (71) and the central spindle (1). Piston head (73), the piston head (73) is disposed in the piston chamber (72), the outer side of the piston head (73) is sealed and slidably connected to the inner wall of the piston cylinder (71), and the inner side of the piston head (73) is sealed and slidably connected to the outer wall of the central spindle (1); The piston tail (74) has its lower end fixedly connected to the piston head (73), and its upper end extends to the outside of the piston chamber (72) and is connected to the lower slip assembly (5) in a driving connection. The central spindle (1) is provided with a pressure transmission hole (72a), which connects the central spindle (1) and the piston chamber (72). The pressure transmission hole (72a) is lower than the piston head (73).

5. The hydraulic setting packer according to claim 4, characterized in that, The outer wall of the piston cylinder (71) is provided with a pressure relief hole (72b), which is higher than the piston head (73).

6. The hydraulic setting packer according to claim 4, characterized in that, A second one-way locking assembly (75) is provided between the piston tail (74) and the piston cylinder (71). The second one-way locking assembly (75) is used to ensure that the piston tail (74) can only move upward relative to the piston cylinder (71) and cannot move downward.

7. The hydraulic setting packer according to claim 1, characterized in that, Both the upper slip assembly (3) and the lower slip assembly (5) are connected to the central spindle (1) via a starting shear pin (8).

8. The hydraulic setting packer according to claim 1, characterized in that, The rubber tube assembly (4) includes a first rubber tube (41), a second rubber tube (42) and a third rubber tube (43) arranged from top to bottom.

9. The hydraulic setting packer according to claim 1, characterized in that, The reaction component (2) includes: Guide ring (21), the guide ring (21) is fixedly connected to the central spindle (1); Mudguard ring (22), which is fixedly connected to guide ring (21); A fixing ring (23) is fixedly connected to the mudguard ring (22); The key block (24) has two ends that abut against the fixing ring (23) and the upper locking assembly (3), respectively.

10. The hydraulic setting packer according to claim 1, characterized in that, The piston assembly (7) and the lower slip assembly (5) are connected by a connecting sleeve (6).

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