A pressure peak control repeatable seat packer

Abstract

The utility model discloses a pressure peak value control can repeat sitting and unsealing's packer relates to oilfield development technical field. Including from top to bottom connection's upper joint, sitting and unsealing control module, anchoring sealing module and lower joint, sitting and unsealing control module includes central tube, first spring, outer sheath, first spring gasket, track reverser, connecting sleeve, track peg, track pressure ring, intermediate sheath, push rod, second spring and second spring gasket, anchoring sealing module includes rubber tube upper shoulder, rubber tube and rubber tube lower shoulder. The utility model provides a kind of innovative tool and method for the leakage-finding measure of old well wellbore, its small size, no slip, soft long rubber tube and the characteristics of repeatable operation, effectively solve the limitation of prior art in such application, and it has good application prospect and popularization value by actual test verification.

Description

Technical Field

[0001] This utility model relates to the field of oilfield development technology, specifically to a packer with pressure peak control and repeatable desealability. Background Technology

[0002] In oilfield development, packers are indispensable. As one of the most commonly used downhole tools in oilfields, their function is to seal the annulus in the tubing. Currently, there are many types of packers in the industry, with varying applications. Based on long-term experience in oilfield downhole operations and well interventions, it is generally believed that in older wells with corrosion and scaling, especially in horizontal well sections with long production cycles, corrosion, scaling, and sand deposits make it difficult to treat the casing surface to meet the packer setting requirements. In-depth research and screening of the most commonly used K, Y, Z, or combined series packers suggests that for horizontal wells requiring segmented water detection and plugging, or for conventional wells requiring leak detection, a safer, more reliable, and durable packer capable of repeated setting and unsetting is needed to meet the requirements of these types of well interventions. Utility Model Content

[0003] The purpose of this invention is to provide a packer with pressure peak control and reversible setting and unsetting, which features a small outer diameter, no slips, a soft and long rubber sleeve, and the ability to set and unset multiple times, in order to solve the problems of the prior art.

[0004] This utility model provides a technical solution:

[0005] A pressure peak controlled repetitive seat-and-unseal packer includes an upper connector, a seat-and-unseal control module, an anchoring sealing module, and a lower connector connected from top to bottom. The seat-and-unseal control module includes a central tube, a first spring, an outer sheath, a first spring washer, a track reversing device, a connecting sleeve, a track spike, a track pressure ring, an intermediate sheath, a push rod, a second spring, and a second spring washer.

[0006] The upper connector, outer sheath, connecting sleeve, intermediate sheath, anchoring sealing module, and lower connector are sequentially connected and all located on the outside of the central tube.

[0007] The spring washer is sleeved on the outside of the central tube. The first spring is disposed in the cavity between the outer sheath and the central tube, with one end abutting against the end of the upper connector and the other end abutting against the end of the spring washer. The track reversing device and the track pressure ring are located on the outside of the central tube. One end of the track reversing device abuts against the end of the spring washer and the other end is connected to the track pressure ring. The outer wall of the track reversing device has a track groove that mates with the track pin. The middle sheath has a receiving groove that mates with the push rod. The middle part of the push rod has a stepped surface, and the middle part of the receiving groove has a limiting inclined surface that mates with the stepped surface. The second spring is located in the cavity between the outer wall of the push rod and the inner wall of the receiving groove, with one end abutting against the end of the stepped surface and the other end abutting against the end of the second spring washer. The second spring washer is embedded inside the middle sheath.

[0008] Furthermore, the anchoring sealing module includes an upper shoulder of the rubber tube, a rubber tube, and a lower shoulder of the rubber tube. One end of the upper shoulder of the rubber tube is threadedly connected to the intermediate sheath, and the other end abuts against the rubber of the rubber tube. One end of the lower shoulder of the rubber tube is threadedly connected to the lower connector, and the other end abuts against the rubber of the rubber tube.

[0009] Furthermore, both the upper and lower shoulder guards of the rubber tube are provided with long steps, and both long steps are pressed against the rubber skin of the rubber tube.

[0010] Furthermore, a bidirectional fluid flow hole is provided on the central tube near the track commutator. During setting, the bidirectional fluid flow hole serves as a fluid inlet channel, and during unsealing, the bidirectional fluid flow hole serves as a pressure relief channel.

[0011] Furthermore, the track pin has retaining rings on both sides, and both the retaining rings and the track pin are embedded inside the connecting sleeve. The retaining rings are used to protect the track pin and limit its axial movement.

[0012] Furthermore, the second spring washer has a through hole through which the end of the push rod passes, for limiting the radial direction of the push rod.

[0013] Furthermore, one end of the central tube is threaded to the inner hole of the upper connector, and the other end is threaded to the inner hole of the lower connector. One end of the outer sheath is threaded to the upper connector, and the other end is threaded to the connecting sleeve. The other end of the connecting sleeve is threaded to the intermediate sheath. The track reversing device is threaded to the track pressure ring.

[0014] Furthermore, a first sealing ring is provided at the connection between the upper connector and the central tube, a second sealing ring is provided in the middle of the central tube, a third sealing ring is provided at the connection between the track reversing device and the connecting sleeve, a fourth sealing ring is provided at the connection between the connecting sleeve and the intermediate sheath, a fifth sealing ring is provided in the middle of the intermediate sheath, a sixth sealing ring is provided at the connection between the intermediate sheath and the upper shoulder of the rubber tube, a seventh sealing ring is provided at the contact surface between the upper shoulder of the rubber tube and the rubber tube, an eighth sealing ring is provided at the connection between the lower connector and the lower shoulder of the rubber tube, and a ninth sealing ring is provided at the connection between the lower connector and the central tube.

[0015] Furthermore, the maximum diameter of the rubber tube is 113mm, and the maximum diameter of the upper connector, lower connector, outer sheath, connecting sleeve, intermediate sheath, upper shoulder of the rubber tube, and lower shoulder of the rubber tube is 115mm.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] (1) The packer of this utility model has a small overall outer diameter, which significantly improves the smoothness of well entry. In view of the common problems of waxing, scaling and possible diameter reduction in old well barrels, this utility model optimizes the internal structural space layout and controls the maximum outer diameter of the packer to within 115mm while ensuring the core function. This design effectively avoids the risk of packer jamming caused by poor well barrel quality. Field tests show that the packer is smoothly and unobstructed during the lowering process, which successfully ensures construction efficiency.

[0018] (2) The packer of this utility model features a slipless anchoring design, which ensures high operational safety and reliability. Traditional packers rely on slips for anchoring, and in environments with poor well conditions, slip opening can easily cause damage to the rubber sleeve or even jamming. This utility model innovatively eliminates the slip structure, fundamentally eliminating the risk of rubber sleeve damage and tool jamming caused by accidental movement of the anchoring components. It not only protects the sealing elements but also significantly improves the safety of raising and lowering tools, making it particularly suitable for complex old well environments.

[0019] (3) Long, soft rubber sleeve structure, excellent sealing performance and resetting capability. This utility model adopts a softer and longer rubber sleeve design. The traditional expandable rubber sleeve has a Shore hardness of 95 or 85 degrees, while the rubber sleeve of this utility model has a hardness of 75 degrees, which is relatively soft. The total length is 530mm, and the effective length is 240mm. It will extend further after setting. Compared with the traditional rubber sleeve with an effective length of 160mm, it is 80mm longer, which is more conducive to sealing. The rubber material is more likely to deform under a lower setting force, fully filling the irregular wellbore space and achieving effective sealing. The longer rubber sleeve increases the contact area with the casing, further enhancing the reliability of the seal. This combination design enables the packer to maintain excellent sealing ability while having good resetting and unsetting performance.

[0020] (4) It can be repeatedly set and unsealed, with outstanding adaptability and economy. Based on the recovery characteristics of no slip damage and long soft rubber sleeve, the packer of this utility model can withstand multiple set and unsealed cycles without the need to replace parts when pulling out of the drill. This function meets the needs of repeated testing and verification of the packer section in leak finding construction. Multiple layers can be completed in a single drilling trip, which significantly reduces the number of trips and the operation time, and reduces construction costs and labor intensity. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall external structure of the packer of this utility model.

[0022] Figure 2 This is a cross-sectional view of the packer of this utility model in operation when it is inserted into the well.

[0023] Figure 3 This is a cross-sectional view of the working state of the packer of this utility model when it is lowered to the predetermined position and pressurized to change track and set.

[0024] Figure 4 This utility model Figure 2 A magnified view of the upper part of the image.

[0025] Figure 5 This utility model Figure 2 A magnified view of the central part of the image.

[0026] Figure 6 This utility model Figure 2 A magnified view of the lower part of the image.

[0027] Figure 7 This utility model Figure 3 A magnified view of the central part of the image.

[0028] Figure 8 This is a schematic diagram of the track commutator structure of this utility model.

[0029] Figure 9 This is a top cross-sectional view of the track commutator of this utility model.

[0030] Figure 10 This is a schematic diagram of the track groove in the track commutator of this utility model after it has been unfolded.

[0031] Figure 11 This is a schematic diagram of the track commutator and track spike of this utility model.

[0032] Figure 12 This is a schematic diagram of the push rod structure of this utility model.

[0033] Figure 13 This is a schematic diagram of the intermediate sheath structure of this utility model.

[0034] Explanation of reference numerals in the attached drawings: 1-Upper connector; 2-First sealing ring; 3-Central tube; 4-First spring; 5-Outer sheath; 6-First spring washer; 7-Railway reversing device; 8-Second sealing ring; 9-Connecting sleeve; 10-Fixing ring; 11-Railway pin; 12-Third sealing ring; 13-Fourth sealing ring; 14-Railway pressure ring; 15-Fifth sealing ring; 16-Intermediate sheath; 17-Push rod; 18-Second spring; 19-Second spring washer; 20-Sixth sealing ring; 21-Seventh sealing ring; 22-Upper shoulder of rubber tube; 23-Rubber tube; 24-Lower shoulder of rubber tube; 25-Eighth sealing ring; 26-Ninth sealing ring; 27-Lower connector; 28-Bidirectional fluid flow hole. Detailed Implementation

[0035] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0036] Example 1

[0037] Please see Figures 1 to 13 This embodiment provides a packer with pressure peak control and reusable seat-and-unseal capability, including an upper connector 1, a seat-and-unseal control module, an anchoring and sealing module, and a lower connector 27 connected from top to bottom. The seat-and-unseal control module includes a central tube 3, a first spring 4, an outer sheath 5, a first spring washer 6, a track reversing device 7, a connecting sleeve 9, a fixing ring 10, a track pin 11, a track pressure ring 14, an intermediate sheath 16, a push rod 17, a second spring 18, and a second spring washer 19. The anchoring and sealing module includes an upper shoulder 22 of the rubber sleeve, a rubber sleeve 23, and a lower shoulder 24 of the rubber sleeve.

[0038] The upper connector 1, outer sheath 5, connecting sleeve 9, intermediate sheath 16, anchoring sealing module, and lower connector 27 are sequentially connected and all located on the outside of the central tube 3. A spring washer 6 is sleeved on the outside of the central tube 3. A first spring 4 is located in the cavity between the outer sheath 5 and the central tube 3, with one end abutting against the end of the upper connector 1 and the other end abutting against the end of the spring washer 6. The track reversing device 7 and track pressure ring 14 are located on the outside of the central tube 3. One end of the track reversing device 7 abuts against the end of the spring washer 6, and the other end... Connected to the track pressure ring 14, the outer wall of the track reversing device 7 is provided with a track groove that mates with the track pin 11. The middle sleeve 16 is provided with a receiving groove that mates with the push rod 17. The middle part of the push rod 17 is provided with a stepped surface. The middle part of the receiving groove is provided with a limiting inclined surface that mates with the stepped surface. The second spring 18 is located in the cavity between the outer wall of the push rod 17 and the inner wall of the receiving groove. One end of the spring 18 abuts against the end of the stepped surface, and the other end abuts against the end of the second spring washer 19. The second spring washer 19 is embedded in the inside of the middle sleeve 16.

[0039] One end of the upper shoulder guard 22 of the rubber tube is threaded to the middle sleeve 16, and the other end abuts against the rubber of the rubber tube 23. One end of the lower shoulder guard 24 of the rubber tube is threaded to the lower connector 27, and the other end abuts against the rubber of the rubber tube 23.

[0040] In this embodiment, a first sealing ring 2 is provided at the connection between the upper connector 1 and the central tube 3, a second sealing ring 8 is provided in the middle of the central tube 3, a third sealing ring 12 is provided at the connection between the track reversing device 7 and the connecting sleeve 9, a fourth sealing ring 13 is provided at the connection between the connecting sleeve 9 and the intermediate protective sleeve 16, a fifth sealing ring 15 is provided in the middle of the intermediate protective sleeve 16, a sixth sealing ring 20 is provided at the connection between the intermediate protective sleeve 16 and the upper shoulder 22 of the rubber tube, a seventh sealing ring 21 is provided at the contact surface between the upper shoulder 22 of the rubber tube and the rubber tube 23, an eighth sealing ring 25 is provided at the connection between the lower connector 27 and the lower shoulder 24 of the rubber tube, and a ninth sealing ring 26 is provided at the connection between the lower connector 27 and the central tube 3.

[0041] Specifically, the first sealing ring 2 installed at the connection between the upper connector 1 and the central tube 3 ensures the airtightness of the cavity where the first spring is located; the second sealing ring 8 installed in the middle of the central tube 3 ensures the airtightness of the cavity where the first spring 4 and the track commutator 7 are located; the third sealing ring 12 installed at the lower end of the connecting sleeve 9 and the contact surface of the long and short grooves of the track commutator 7 ensures the airtightness of the cavity where the track commutator 7 is located; and the fourth sealing ring 13 installed at the lower end of the connecting sleeve 9 and the contact surface of the intermediate sheath 16 allows external liquid to enter the cavity where the track pressure ring 14 is located through the threaded connection gap. The fifth sealing ring 15 ensures the sealing of the inner cavity of the rubber tube. The sixth sealing ring 20, installed near the threaded connection between the intermediate sleeve 16 and the upper shoulder 22 of the rubber tube, ensures the sealing of the inner cavity of the rubber tube 23. The seventh sealing ring 21, installed on the contact surface between the upper shoulder 22 of the rubber tube and the rubber tube 23, ensures the sealing of the inner cavity of the rubber tube 23. The eighth sealing ring 25, installed near the threaded connection between the upper end of the lower connector 27 and the lower shoulder 24 of the rubber tube, ensures the sealing of the inner cavity of the rubber tube 23. The ninth sealing ring 26, installed near the threaded connection between the upper end of the lower connector 27 and the lower end of the central tube 3, ensures the sealing of the inner cavity of the rubber tube 23.

[0042] In this embodiment, when the packer is inserted into the well, the upper end of the upper connector 1 is connected to the φ73mm tool tubing via a thread; the first spring 4 ensures that the rail spike 11 can flexibly change tracks on the long and short slots of the rail reversing device 7; the outer sheath 5 can lock the first spring 4 and the first spring washer 6, serving as a protective sleeve; the first spring washer 6 can prevent the first spring 4 from becoming misaligned and has a larger contact area with the upper end of the rail reversing device 7 to ensure the smooth sliding of the rail reversing device 7; the rail slots of the rail reversing device 7 are angled. The long and short grooves, combined with pressure, allow the track spike 11 to flexibly change track on its long and short grooves, enabling repeated sitting and unsealing, and are one of the core components of this utility model; the connecting sleeve 9 connects the left and right sleeves and protects the track reversing device 7; the fixing ring 10 is located on both sides of the track spike 11, and both the fixing ring 10 and the track spike 11 are embedded inside the connecting sleeve 9. The fixing ring 10 is used to protect the track spike 11 and limit the axial movement of the track spike 11; the upper end of the track spike 11 rests in the long and short groove of the track reversing device 7, and the left and right ends are secured by the fixing ring 10. The track ring 14 is fixed in place and embedded in the connecting sleeve 9, cooperating with the track reversing device 7 to form an important structure in the seat-unseal control module for achieving repeated seat-unseal. When entering the well, the lower end of the track pressure ring 14 presses against the push rod 17. During the seat-unseal press, it is squeezed by the liquid and slides with the track reversing device 7, increasing the contact area with the push rod 17 and thus pushing the push rod 17. This causes the cavity of the rubber sleeve 23 to expand and contract, thereby achieving seat-unseal. It is one of the core components of this utility model. The intermediate protective sleeve 16 protects the push rod 1 and restricts its movement. The radial displacement of 7 enhances the sealing performance of the cavity of the rubber sleeve 23; the push rod 17 ensures the sealing performance of the cavity of the rubber sleeve 23 and is one of the core components of this utility model; one end of the second spring 18 abuts against the T-shaped step surface in the middle of the push rod 17, and the other end abuts against the upper end of the second spring washer 19. Through the compression and release of elastic potential energy, the expansion sealing and pressure relief unsealing of the cavity of the rubber sleeve 23 are achieved; the second spring washer 19 has a through hole for the end of the push rod 17 to pass through, which is used to limit the radial movement of the push rod 17; the lower end of the lower connector 27 is connected to φ

[0043] A 73mm tool oil pipe is shorted and plugged in place for threaded connection.

[0044] In this embodiment, a bidirectional liquid flow hole 28 is provided on the central tube 3 near the track commutator 7. When the tube is set, the bidirectional liquid flow hole is a liquid inlet channel, and when the tube is unsealed, the bidirectional liquid flow hole is a pressure relief channel.

[0045] In this embodiment, the maximum diameter of the rubber tube 23 is 113mm, and the maximum diameter of the upper connector 1, lower connector 27, outer sheath 5, connecting sleeve 9, intermediate sheath 16, upper shoulder of the rubber tube 22, and lower shoulder of the rubber tube 24 is 115mm.

[0046] Preferably, both the upper shoulder 22 and the lower shoulder 24 of the rubber sleeve are provided with long steps, and the long steps of both are pressed against the rubber skin of the rubber sleeve 23. The rubber sleeve 23 is made of oil-resistant rubber to ensure the adaptability of the rubber sleeve in complex downhole environments. The long steps of the upper shoulder 22 press against the rubber skin of the rubber sleeve 23, increasing the contact area with the rubber skin and acting as a sealing ring. The long steps of the lower shoulder 24 can also ensure the sealing of the inner cavity of the rubber sleeve (23).

[0047] Preferably, one end of the central tube 3 is threaded to the inner hole of the upper connector 1, and the other end is threaded to the inner hole of the lower connector 27. One end of the outer sheath 5 is threaded to the upper connector 1, and the other end is threaded to the connecting sleeve 9. The other end of the connecting sleeve 9 is threaded to the intermediate sheath 16. The track reversing device 7 and the track pressure ring 14 are connected by threads. The use of threaded connections facilitates installation and disassembly.

[0048] Example 2

[0049] This embodiment provides a construction process for a packer with pressure peak control and repeatable sealing and unlocking, including the following steps:

[0050] 1. Install each component according to the downhole state. The rail spike 11 is located at the upper end of the rail groove of the rail reversing device 7. The push rod 17 is pushed open by the rail pressure ring 14 and is in the open position. After being lowered into the well, the tubing is pressurized. The pressure enters the rubber sleeve 23 through the gap between the push rod 17 and the intermediate sheath 16 and expands the rubber sleeve 23. At the same time, the rail reversing device 7 moves towards the upper connector 1 under the pressure, so that the rail spike 11 enters the short groove from the long groove of the rail groove and is locked. After depressurization, the rail reversing device 7 cannot move downward. The push rod 17 seals the inner cavity of the rubber sleeve 23 under the action of the second spring 18.

[0051] 2. When pressure relief is required, the oil pipe continues to be pressurized, appropriately higher than the setting seal pressure. At this time, the pressure inside the rubber sleeve 23 continues to increase, but at the same time, the rail reversing device 7 begins to move into the long slot under the pressure. After maintaining the pressure for a period of time, the pressure is slowly released. The rail pin 11 is successfully moved into the long slot of the rail groove in the rail reversing device 7. At the same time, the rail pressure ring 14 connected to the end of the rail reversing device 7 contacts the push rod 17. Under the action of the first spring 4, the one-way valve core is pushed down and the pressure inside the rubber sleeve 23 is released. Since the diameter of the push rod 17 is small, the opening force is small.

[0052] 3. After the pressure is released, the packer returns to its initial state when it is lowered into the well, and can be repeatedly set and unsealed in sequence.

[0053] This utility model relates to a mechanical downhole packer tool. Its overall design goal is to provide a safe, reliable, and efficient repeatable packer for finding leaks in old wells with complex wellbore conditions. The entire tool adopts a top-down modular structure design, mainly composed of four core parts connected in series: an upper connector module, a packing / unpacking control module, an anchoring and sealing module, and a lower connector module. The modules are primarily connected by precision-machined threads, and sealing rings are installed at key functional interfaces to ensure the integrity of the internal pressure of the tool. It features small size, no slips required, a flexible and long rubber sleeve, and repeatability, effectively overcoming the limitations of existing technologies in this type of application. Actual testing has verified that it has good application prospects and promotional value.

[0054] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the technical scope of the present utility model. Therefore, any minor modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A packer with pressure peak control and reversible sealing and unlocking, characterized in that, It includes an upper connector (1), a seat unsealing control module, an anchoring sealing module, and a lower connector (27) connected from top to bottom. The seat unsealing control module includes a central tube (3), a first spring (4), an outer sheath (5), a first spring washer (6), a track reversing device (7), a connecting sleeve (9), a track spike (11), a track pressure ring (14), an intermediate sheath (16), a push rod (17), a second spring (18), and a second spring washer (19). The upper connector (1), outer sheath (5), connecting sleeve (9), intermediate sheath (16), anchoring sealing module, and lower connector (27) are sequentially connected and all located on the outside of the central tube (3). The spring washer (6) is sleeved on the outside of the central tube (3). The first spring (4) is located in the cavity between the outer sheath (5) and the central tube (3), with one end abutting against the end of the upper connector (1) and the other end abutting against the end of the spring washer (6). The track commutator (7) and the track pressure ring (14) are located on the outside of the central tube (3). One end of the track commutator (7) abuts against the end of the spring washer (6). The end abuts, one end is connected to the track pressure ring (14), the outer wall of the track reversing device (7) is provided with a track groove that cooperates with the track pin (11), the middle sleeve (16) is provided with a receiving groove that cooperates with the push rod (17), the middle part of the push rod (17) is provided with a stepped surface, the middle part of the receiving groove is provided with a limiting inclined surface that cooperates with the stepped surface, the second spring (18) is located in the cavity between the outer wall of the push rod (17) and the inner wall of the receiving groove, and one end abuts with the end of the stepped surface, and the other end abuts with the end of the second spring washer (19), the second spring washer (19) is embedded in the interior of the middle sleeve (16).

2. The packer with pressure peak control and reversible sealing and unlocking as described in claim 1, characterized in that, The anchoring and sealing module includes an upper shoulder (22), a rubber tube (23), and a lower shoulder (24). One end of the upper shoulder (22) is threaded to the intermediate sleeve (16), and the other end abuts against the rubber of the rubber tube (23). One end of the lower shoulder (24) is threaded to the lower connector (27), and the other end abuts against the rubber of the rubber tube (23).

3. A packer with pressure peak control and reversible sealing and unlocking as described in claim 2, characterized in that, Both the upper shoulder guard (22) and the lower shoulder guard (24) of the rubber tube are provided with long steps, and the long steps of both are pressed against the rubber skin of the rubber tube (23).

4. The packer with pressure peak control and reversible sealing and unlocking as described in claim 1, characterized in that, The central tube (3) is provided with a bidirectional liquid flow hole (28) near the track commutator (7). When the tube is set, the bidirectional liquid flow hole (28) is a liquid inlet channel, and when the tube is unsealed, the bidirectional liquid flow hole (28) is a pressure relief channel.

5. A packer with pressure peak control and reversible sealing and unlocking as described in claim 1, characterized in that, The track pin (11) has fixing rings (10) on both sides. The fixing rings (10) and the track pin (11) are both embedded inside the connecting sleeve (9). The fixing rings (10) are used to protect the track pin (11) and limit the axial movement of the track pin (11).

6. A packer with pressure peak control and reversible sealing and unlocking as described in claim 1, characterized in that, The second spring washer (19) has a through hole through which the end of the push rod (17) passes, for limiting the radial direction of the push rod (17).

7. A packer with pressure peak control and reversible sealing and unlocking as described in claim 2, characterized in that, One end of the central tube (3) is threaded to the inner hole of the upper connector (1), and the other end is threaded to the inner hole of the lower connector (27). One end of the outer sleeve (5) is threaded to the upper connector (1), and the other end is threaded to the connecting sleeve (9). The other end of the connecting sleeve (9) is threaded to the intermediate sleeve (16). The track reversing device (7) is threaded to the track pressure ring (14).

8. A packer with pressure peak control and reversible sealing and unlocking as described in claim 7, characterized in that, A first sealing ring (2) is provided at the connection between the upper connector (1) and the central tube (3). A second sealing ring (8) is provided in the middle of the central tube (3). A third sealing ring (12) is provided at the connection between the track reversing device (7) and the connecting sleeve (9). A fourth sealing ring (13) is provided at the connection between the connecting sleeve (9) and the intermediate protective sleeve (16). A fifth sealing ring (15) is provided in the middle of the intermediate protective sleeve (16). A sixth sealing ring (20) is provided at the connection between the intermediate protective sleeve (16) and the upper shoulder (22) of the rubber tube. A seventh sealing ring (21) is provided at the contact surface between the upper shoulder (22) of the rubber tube and the rubber tube (23). An eighth sealing ring (25) is provided at the connection between the lower connector (27) and the lower shoulder (24) of the rubber tube. A ninth sealing ring (26) is provided at the connection between the lower connector (27) and the central tube (3).

9. A packer with pressure peak control and reversible sealing and unlocking as described in claim 2, characterized in that, The maximum diameter of the rubber tube (23) is 113mm, and the maximum diameter of the upper connector (1), lower connector (27), outer sheath (5), connecting sleeve (9), intermediate sheath (16), upper shoulder guard (22) of the rubber tube and lower shoulder guard (24) of the rubber tube is 115mm.

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