Double-rubber-cylinder pressure distribution packer for high-temperature and high-pressure well

Abstract

The utility model discloses a double rubber sleeve pressure distribution packer for a high temperature and high pressure well, which comprises a hydraulic anchor mechanism, the lower end of the hydraulic anchor mechanism is connected with a pressure distribution mechanism used for converting high pressure difference acting on rubber sleeves into low pressure difference, and the lower end of the pressure distribution mechanism is sequentially connected with an upper rubber sleeve sealing mechanism and a lower rubber sleeve sealing mechanism. The upper rubber sleeve sealing mechanism and the lower rubber sleeve sealing mechanism are fixedly connected through a shear pin, and the lower end of the upper rubber sleeve sealing mechanism is connected with a convex lug mandrel; and a mechanical slip mechanism and a friction block mechanism are arranged on the convex lug mandrel. The problem that in the prior art, when a single rubber sleeve sealing unit works in a high-temperature and high-pressure well, due to the fact that pressure is too high, a rubber sleeve is damaged, and fracturing operation fails is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas downhole tools, and particularly relates to a double-packer pressure distribution packer for high-temperature and high-pressure wells. Background Art

[0002] A packer is an essential product in oil and gas downhole tools. By using the packer to separate the annulus kill fluid from the formation fluid, the downhole oil and gas flow, pressure measurement, and sampling can be realized.

[0003] For the existing packers, whether it is the hydraulic setting method or the mechanical setting method, there is only a single packer element sealing unit. However, the reliability of the packer element sealing under high temperature and high pressure difference is relatively low. Especially during the large-displacement high-pressure fracturing stage, due to excessive force on a set of packer elements, exceeding the load-bearing limit of the packer elements, the internal structure of the packer elements collapses, resulting in damage to the packer elements, rapid unsealing of the packer, and failure of the fracturing operation. This causes significant economic losses to the oilfield and safety risks at the well site. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a double-packer pressure distribution packer for high-temperature and high-pressure wells, which solves the problem that the single packer element sealing unit in the prior art is damaged due to excessive pressure during operation in high-temperature and high-pressure wells, resulting in the failure of the fracturing operation.

[0005] The technical solution adopted by the utility model is that the double-packer pressure distribution packer for high-temperature and high-pressure wells includes a hydraulic anchor mechanism for preventing the packer from moving upward. The lower end of the hydraulic anchor mechanism is connected to a pressure distribution mechanism for converting the high-pressure difference acting on the packer element into a low-pressure difference. The lower end of the pressure distribution mechanism is sequentially connected to an upper packer element sealing mechanism and a lower packer element sealing mechanism. The upper packer element sealing mechanism and the lower packer element sealing mechanism are connected by shear pins. The lower end of the upper packer element sealing mechanism is connected to a lug mandrel, and a through hole for the tubing pressure to pass through is opened on the lug mandrel.

[0006] A mechanical slip mechanism for preventing the packer from moving downward and a friction block mechanism for setting the packer are arranged on the lug mandrel.

[0007] The utility model is further characterized in that

[0008] The hydraulic anchor mechanism includes a hydraulic anchor body and a volume tube. A hydraulic anchor slip assembly is connected to the hydraulic anchor body. The volume tube is located inside the hydraulic anchor body and penetrates through the pressure distribution mechanism, the upper packer element sealing mechanism, and the lower packer element sealing mechanism and is connected to the lug mandrel.

[0009] An annular space gap is formed between the outer wall of the volume tube and the pressure distribution mechanism, the upper packer element sealing mechanism, and the lower packer element sealing mechanism.

[0010] The pressure distribution mechanism includes a pressure distribution outer cylinder, which is threadedly connected to the lower end of the hydraulic anchor body. Inside the pressure distribution outer cylinder, there is a pressure distribution mandrel. The volume tube passes through the inside of the pressure distribution mandrel. The pressure distribution mandrel is movably connected to the pressure distribution outer cylinder, and a double rubber cylinder closed pressure acting chamber is formed between the middle of the pressure distribution mandrel and the pressure distribution outer cylinder. The lower end of the pressure distribution outer cylinder is connected to the upper rubber cylinder sealing mechanism, and an oil injection port is opened on the upper rubber cylinder sealing mechanism.

[0011] A pressure distribution pressure transmission channel is opened in the pressure distribution outer cylinder and the upper rubber cylinder sealing mechanism. The hydraulic oil enters the pressure distribution pressure transmission channel through the oil injection port and flows to the double rubber cylinder closed pressure acting chamber.

[0012] Both ends of the pressure distribution mandrel respectively form an upper tubing pressure acting chamber with the hydraulic anchor body and a lower tubing pressure acting chamber with the pressure distribution outer cylinder. The upper tubing pressure acting chamber and the lower tubing pressure acting chamber are connected, and the volumes of the upper tubing pressure acting chamber and the lower tubing pressure acting chamber are smaller than the volume of the double rubber cylinder closed pressure acting chamber.

[0013] The upper rubber cylinder sealing mechanism includes an upper rubber cylinder mandrel. The volume tube passes through the inside of the upper rubber cylinder mandrel. The upper rubber cylinder mandrel is connected to the lower end of the pressure distribution outer cylinder, and the oil injection port is located on the side wall of the upper rubber cylinder mandrel. The pressure distribution pressure transmission channel is located inside the upper rubber cylinder mandrel. An upper rubber cylinder sealing unit for sealing the annulus pressure is sleeved outside the upper rubber cylinder mandrel. A top shoe abuts against the upper end of the upper rubber cylinder sealing unit, and the top shoe is threadedly connected to the pressure distribution outer cylinder.

[0014] The lower end of the upper rubber cylinder mandrel is connected to the lower rubber cylinder sealing mechanism, and the lower end of the upper rubber cylinder mandrel is connected to the lug mandrel through a connecting short section.

[0015] The lower rubber cylinder sealing mechanism includes a lower rubber cylinder mandrel connected to the upper rubber cylinder mandrel. One end of the lower rubber cylinder mandrel abuts against the top shoe, and an annular groove for the hydraulic oil to pass through is opened at the position of the lower rubber cylinder mandrel relative to the oil injection port.

[0016] A lower rubber cylinder sealing unit for sealing the tubing pressure is sleeved on the lower rubber cylinder mandrel. The upper end of the lower rubber cylinder sealing unit abuts against the lower rubber cylinder mandrel, and the other end abuts against a bottom shoe. One end of the bottom shoe away from the lower rubber cylinder sealing unit is connected to an open connection sleeve. The open connection sleeve is located outside the connecting short section, and the other end of the open connection sleeve is connected to a connecting outer cylinder. The connecting outer cylinder is connected to the mechanical slip mechanism.

[0017] The mechanical slip mechanism includes a slip sleeve sleeved on the upper end of the lug mandrel. The slip sleeve is connected to the connecting outer cylinder. A slip fixing pin is fixedly connected to the slip sleeve. A mechanical slip is inserted into the T-shaped groove of the slip sleeve, and the slip fixing pin is hooked to the mechanical slip to prevent the mechanical slip from falling off.

[0018] The friction block mechanism includes a friction block outer cylinder sleeved on the lower end of the lug mandrel. The friction block outer cylinder is connected to the mechanical slip mechanism through an open retaining ring. A friction block is arranged on the friction block outer cylinder. The friction block is fixedly connected to the friction block outer cylinder through a pressing block. A cavity is formed between the friction block and the friction block outer cylinder, and a friction block spring is arranged in the cavity.

[0019] The beneficial effects of the present utility model are as follows:

[0020] The double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model respectively bears the tubing pressure and the trapped pressure between the upper and lower packers through a pressure distribution mandrel. When the tubing pressure is greater than the annulus pressure, due to the volume of the double-packer trapped pressure acting chamber being larger than the volumes of the upper tubing pressure acting chamber and the lower tubing pressure acting chamber, the tubing pressure generates an upward pre-driving force on the pressure distribution mandrel. Under the action of the pressure distribution mandrel, the hydraulic oil in the double-packer trapped pressure acting chamber enters the trapped space between the upper and lower packers through the pressure distribution pressure transmission channel. The pressure in the trapped space between the upper and lower packers increases and cancels out the pressures on both ends of the upper packer sealing unit and the lower packer sealing unit, thereby realizing the conversion of the high pressure difference borne by the packer to a low pressure difference, avoiding the internal structure collapse of the upper packer sealing unit and the lower packer sealing unit, resulting in packer damage, and improving the sealing reliability of the upper packer sealing unit and the lower packer sealing unit. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0022] Figure 2 is a schematic structural diagram of the hydraulic anchor mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0023] Figure 3 is a schematic structural diagram of the pressure distribution mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0024] Figure 4 is a schematic structural diagram of the upper packer sealing mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0025] Figure 5 is a schematic structural diagram of the lower packer sealing mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0026] Figure 6 is a schematic structural diagram of the mechanical slip mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model;

[0027] Figure 7This is a schematic structural view of the friction block mechanism in the double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model.

[0028] In the figure, 1. Hydrostatic anchor body, 2. Volume tube, 3. Hydrostatic anchor slip assembly, 4. Pressure distribution outer cylinder, 5. Pressure distribution mandrel, 6. Upper packer mandrel, 7. Top shoe, 8. Upper packer seal unit, 9. Lower packer mandrel, 10. Shearing pin, 11. Lower packer seal unit, 12. Bottom shoe, 13. Connecting nipple, 14. Split connecting sleeve, 15. Connecting outer cylinder, 16. Slip sleeve, 17. Slip fixing pin, 18. Mechanical slip, 19. Split retaining ring, 20. Friction block, 21. Friction block spring, 22. Friction block outer cylinder, 23. Pressing block, 24. Lug mandrel, 25. Pressure distribution pressure transmission channel, 26. Hydraulic oil, 27. Oil injection port, 28. Upper acting chamber of tubing pressure, 29. Confined pressure acting chamber of double packer, 30. Lower acting chamber of tubing pressure, 31. Hydrostatic anchor mechanism, 32. Pressure distribution mechanism, 33. Upper packer seal mechanism, 34. Lower packer seal mechanism, 35. Mechanical slip mechanism, 36. Friction block mechanism. Detailed implementation mode

[0029] The present utility model will be described in detail below in conjunction with the accompanying drawings and the detailed implementation mode.

[0030] Embodiment 1

[0031] The double-packer pressure distribution packer for high-temperature and high-pressure wells of the present utility model, as Figure 1 shown, includes a hydrostatic anchor mechanism 31. The lower end of the hydrostatic anchor mechanism 31 is connected with a pressure distribution mechanism 32 for converting the high pressure difference acting on the packer into a low pressure difference. The lower end of the pressure distribution mechanism 32 is sequentially connected with an upper packer seal mechanism 33 and a lower packer seal mechanism 34. The lower end of the upper packer seal mechanism 33 is connected with a lug mandrel 24, and a through hole for the tubing pressure to pass through is opened on the lug mandrel 24;

[0032] A mechanical slip mechanism 35 and a friction block mechanism 36 are arranged on the lug mandrel 24.

[0033] Specifically, the hydrostatic anchor mechanism 31 is used in the fracturing process. When the tubing pressure is higher than the annulus pressure, the hydrostatic anchor slip assembly 3 radially expands and is embedded into the inner wall of the casing to prevent the packer from moving upward.

[0034] The upper packer seal mechanism 33 is used to seal off the annulus and the confined space between the upper and lower packers;

[0035] The lower packer seal mechanism 34 is used to seal off the tubing and the confined space between the upper and lower packers;

[0036] The mechanical slip mechanism 35 is used when the packer is set. The gravity of the lowered drill string radially expands the mechanical slips 18, and the mechanical slips 18 are inserted into the inner wall of the casing to prevent the packer from moving downward.

[0037] The friction block mechanism 36 is used when the packer enters the well and is set. The friction blocks 20 are radially compressed, generating frictional force with the inner wall of the casing. The lug mandrel 24 connected to the drill string is first lifted inside the outer cylinder 22 of the friction block, then rotated and subsequently pressed down, thereby realizing the setting of the packer.

[0038] Embodiment 2

[0039] The double-packer pressure distribution packer of the present utility model for high-temperature and high-pressure wells includes a hydraulic anchor mechanism 31. A pressure distribution mechanism 32 is connected to the lower end of the hydraulic anchor mechanism 31. The lower end of the pressure distribution mechanism 32 is sequentially connected to an upper packer sealing mechanism 33 and a lower packer sealing mechanism 34. The lower end of the upper packer sealing mechanism 33 is connected to a lug mandrel 24. A mechanical slip mechanism 35 for preventing the packer from moving downward and a friction block mechanism 36 for setting the packer are provided on the lug mandrel 24.

[0040] Further, as Figure 2 shown, the hydraulic anchor mechanism 31 includes a hydraulic anchor body 1 and a volume tube 2. A hydraulic anchor slip assembly 3 is connected to the hydraulic anchor body 1. The volume tube 2 is located inside the hydraulic anchor body 1 and passes through the pressure distribution mechanism 32, the upper packer sealing mechanism 33, and the lower packer sealing mechanism 34 to be connected to the lug mandrel 24.

[0041] An annular space gap is formed between the outer wall of the volume tube 2 and the pressure distribution mechanism 32, the upper packer sealing mechanism 33, and the lower packer sealing mechanism 34.

[0042] A through hole for the tubing pressure to pass through is opened on the lug mandrel 24. The tubing pressure enters the annular space gap formed between the outer wall of the volume tube 2 and the pressure distribution mechanism 32, the upper packer sealing mechanism 33, and the lower packer sealing mechanism 34 through the through hole on the lug mandrel 24, and passes through the pressure distribution mechanism 32 to reduce the pressure difference between the upper and lower packers and avoid internal damage to the upper and lower packers.

[0043] Specifically, as Figure 3 shown, the pressure distribution mechanism 32 includes a pressure distribution outer cylinder 4. The pressure distribution outer cylinder 4 is threadedly connected to the lower end of the hydraulic anchor body 1. A pressure distribution mandrel 5 is provided inside the pressure distribution outer cylinder 4. The volume tube 2 passes through the inside of the pressure distribution mandrel 5. The pressure distribution mandrel 5 is movably connected to the pressure distribution outer cylinder 4, and a double-packer closed pressure acting chamber 29 is formed between the middle of the pressure distribution mandrel 5 and the pressure distribution outer cylinder 4. Sealing rings are respectively provided on both sides of the pressure distribution mandrel 5 relative to the double-packer closed pressure acting chamber 29, and are hermetically connected to the hydraulic anchor body 1 and the pressure distribution outer cylinder 4 through the sealing rings.

[0044] The lower end of the pressure distribution outer cylinder 4 is connected to the upper rubber cylinder sealing mechanism 33, and an oil injection port 27 is provided on the upper rubber cylinder sealing mechanism 33; at the same time, a pressure distribution pressure transmission channel 25 is provided inside the pressure distribution outer cylinder 4 and the upper rubber cylinder sealing mechanism 33, and the hydraulic oil 26 enters the pressure distribution pressure transmission channel 25 through the oil injection port 27 and flows to the double rubber cylinder closed pressure acting cavity 29.

[0045] Both ends of the pressure distribution mandrel 5 are respectively formed with an upper tubing pressure acting cavity 28 with the hydraulic anchor body 1 and a lower tubing pressure acting cavity 30 with the pressure distribution outer cylinder 4. The upper tubing pressure acting cavity 28 and the lower tubing pressure acting cavity 30 are communicated, and the volumes of the upper tubing pressure acting cavity 28 and the lower tubing pressure acting cavity 30 are smaller than the volume of the double rubber cylinder closed pressure acting cavity 29.

[0046] That is, the tubing pressure flows through the through holes on the lug mandrel 24 to the positions of the upper tubing pressure acting cavity 28 and the lower tubing pressure acting cavity 30. When the tubing pressure is greater than the annulus pressure, based on the principle of incompressibility of liquids, and at the same time, since the volume of the double rubber cylinder closed pressure acting cavity 29 is larger than the volumes of the upper tubing pressure acting cavity 28 and the lower tubing pressure acting cavity 30, the hydraulic pressure in the double rubber cylinder closed pressure acting cavity 29 is small. The hydraulic oil 26 in the double rubber cylinder closed pressure acting cavity 29 flows through the pressure distribution pressure transmission channel 25 to the closed space between the upper and lower rubber cylinders, and the closed pressure between the upper and lower rubber cylinders increases to offset the annulus pressure borne by the upper rubber cylinder and the tubing pressure borne by the lower rubber cylinder, reducing the pressure difference between the upper and lower rubber cylinders, thereby avoiding the collapse of the internal tissues of the upper rubber cylinder sealing unit and the lower rubber cylinder sealing unit.

[0047] Further, as Figure 4 shown, the upper rubber cylinder sealing mechanism 33 includes an upper rubber cylinder mandrel 6. The volume tube 2 passes through the inside of the upper rubber cylinder mandrel 6. The upper rubber cylinder mandrel 6 is connected to the lower end of the pressure distribution outer cylinder 4, and the oil injection port 27 is located on the side wall of the upper rubber cylinder mandrel 6. The pressure distribution pressure transmission channel 25 is located inside the upper rubber cylinder mandrel 6. Sealing rings are provided on both sides of the upper rubber cylinder mandrel 6 and the pressure distribution outer cylinder 4 at the positions where they are communicated with the pressure distribution pressure transmission channel 25 to prevent leakage of the hydraulic oil 26 during transmission.

[0048] An upper rubber cylinder sealing unit 8 for sealing the annulus pressure is sleeved outside the upper rubber cylinder mandrel 6. The upper end of the upper rubber cylinder sealing unit 8 abuts against a top shoe 7, and the top shoe 7 is threadedly connected to the pressure distribution outer cylinder 4; the lower end of the upper rubber cylinder mandrel 6 is connected to the lower rubber cylinder sealing mechanism 34, and the lower end of the upper rubber cylinder mandrel 6 is connected to the lug mandrel 24 through a connecting nipple 13.

[0049] Further, as Figure 5 shown, the lower rubber cylinder sealing mechanism 34 includes a lower rubber cylinder mandrel 9 connected to the upper rubber cylinder mandrel 6, and the upper rubber cylinder mandrel 6 and the lower rubber cylinder mandrel 9 are fixedly connected by a plurality of shear pins 10.

[0050] One end of the lower rubber cylinder mandrel 9 abuts against the top shoe 7, and a ring groove for the hydraulic oil 26 to pass through is formed in the lower rubber cylinder mandrel 9 at a position opposite to the oil injection port 27, ensuring that when the tubing pressure rises, the hydraulic oil 26 can flow through the pressure distribution and pressure transmission channel 25 to the trapped space between the upper and lower rubber cylinders.

[0051] A lower rubber cylinder sealing unit 11 for sealing the tubing pressure is sleeved on the lower rubber cylinder mandrel 9. The upper end of the lower rubber cylinder sealing unit 11 abuts against the lower rubber cylinder mandrel 9, and the other end abuts against a bottom shoe 12. One end of the bottom shoe 12 away from the lower rubber cylinder sealing unit 11 is connected to an open connection sleeve 14. The open connection sleeve 14 is located outside the connection nipple 13, and the other end of the open connection sleeve 14 is connected to a connection outer cylinder 15. The connection outer cylinder 15 is connected to the mechanical slip mechanism 35.

[0052] Moreover, a through hole is formed in the connection outer cylinder 15. When the shear pin 10 is cut off, the connection nipple 13 is forced to move downward. At this time, the liquid inside the connection outer cylinder 15 is discharged through the through hole in the connection outer cylinder 15 under the action of the movement of the connection nipple 13.

[0053] Embodiment 3

[0054] On the basis of Embodiment 1, as Figure 6 shown, in the double rubber cylinder pressure distribution packer for high-temperature and high-pressure wells of the present utility model, the mechanical slip mechanism 35 includes a slip sleeve 16 sleeved on the upper end of the lug mandrel 24. The slip sleeve 16 is connected to the connection outer cylinder 15. A slip fixing pin 17 is fixedly connected to the slip sleeve 16. A mechanical slip 18 is inserted into the T-shaped groove of the slip sleeve 16. The slip fixing pin 17 is hooked to the mechanical slip 18 to prevent the mechanical slip 18 from falling off.

[0055] As Figure 7 shown, the friction block mechanism 36 includes a friction block outer cylinder 22 sleeved on the lower end of the lug mandrel 24. The friction block outer cylinder 22 is connected to the mechanical slip mechanism 35 through an open hoop 19. Friction blocks 20 are arranged on the friction block outer cylinder 22. The friction block outer cylinder 22 and the friction blocks 20 are connected and fixed through a pressing block 23. A cavity is formed between the friction blocks 20 and the friction block outer cylinder 22, and a friction block spring 21 is arranged in the cavity.

[0056] During installation, first, the friction block outer cylinder 22 is inserted into the upper end of the lug mandrel 24; then the slip fixing pin 17 is tightened on the slip sleeve 16 and inserted into the upper end of the lug mandrel 24; the open hoop 19 is buckled onto the upper end of the friction block outer cylinder 22 and fixed by tightening the screw; finally, the mechanical slip 18 is pushed into the T-shaped groove of the slip sleeve 16, and the slip fixing pin 17 hooks the mechanical slip 18 to prevent the mechanical slip 18 from falling off.

[0057] The sealing method of the double rubber cylinder pressure distribution packer of the present utility model during use specifically includes the following steps:

[0058] Step 1: Assemble the double-packer pressure distribution packer in sequence and lower it to the setting position through the pipe string.

[0059] Step 2: Lift and rotate the pipe string, and then press down the pipe string to expand the mechanical slips 18, so that the double-packer pressure distribution packer is hung on the inner wall of the casing.

[0060] Step 3: Continue to press down the pipe string, and the lower rubber packer sealing unit 11 expands and seats under the extrusion pressure.

[0061] Step 4: Continue to press down the pipe string, shear the shear pin 10 under the downward pressure, and the upper rubber packer sealing unit 8 expands and seats under the extrusion pressure, completing the isolation of the annulus pressure and the tubing pressure.

[0062] When the isolation of the annulus pressure and the tubing pressure is completed, the pressure distribution mechanism 32 uses the principle of incompressibility of the liquid to make the pressure in the trapped space between the upper and lower rubber packers act on the annular area of the double-packer trapped pressure acting chamber 29, and makes the pressure distribution mandrel 5 tend to move downward.

[0063] At the same time, the tubing pressure acts on the annular area difference formed between the tubing pressure lower acting chamber 30 and the tubing pressure upper acting chamber 28, and makes the pressure distribution mandrel 5 tend to move upward.

[0064] When the tubing pressure is higher than the annulus pressure during the fracturing process, the upward thrust generated by the tubing pressure acting on the pressure distribution mandrel 5 is greater than the downward thrust generated by the pressure in the trapped space between the upper and lower rubber packers acting on the pressure distribution mandrel 5.

[0065] This thrust squeezes the hydraulic oil 26 to generate a hydraulic pressure between the double-packer trapped pressure acting chamber 29 and the tubing pressure upper acting chamber 28. Since the hydraulic area of the double-packer trapped pressure acting surface is larger than the hydraulic area between the tubing pressure lower acting surface and the tubing pressure upper acting surface, the hydraulic oil 26 flows through the pressure distribution pressure transmission channel 25 to the trapped space between the upper and lower rubber packers, and the trapped pressure between the upper and lower rubber packers increases. At this time, the trapped pressure between the upper and lower rubber packers is less than the tubing pressure but higher than the annulus pressure, thereby reducing the pressure difference acting on the rubber packer between the tubing pressure and the annulus pressure.

[0066] Taking the fracturing process as an example, illustrate the sealing pressure difference distribution principle and result of the double rubber packers of the present invention: see the following table:

[0067]

[0068] When it is necessary to release the packer, only the tubing string needs to be lifted, so that the upper rubber barrel sealing unit 8 and the lower rubber barrel sealing unit 11 contract, releasing the sealing of the annulus and the tubing. At the same time, the mechanical slip 18 and the hydraulic anchor slip assembly 3 contract to complete the release, and then it can be directly retrieved by lifting.

Claims

1. Double-rubber pressure distribution packer for high temperature and high pressure wells, characterized in that: The invention comprises a hydraulic anchor mechanism (31) for preventing the packer from rising, wherein the lower end of the hydraulic anchor mechanism (31) is connected to a pressure distribution mechanism (32) for converting a high pressure difference acting on the rubber cylinder into a low pressure difference, and the lower end of the pressure distribution mechanism (32) is sequentially connected to an upper rubber cylinder sealing mechanism (33) and a lower rubber cylinder sealing mechanism (34), wherein the upper rubber cylinder sealing mechanism (33) and the lower rubber cylinder sealing mechanism (34) are connected via a shear pin (10), and the lower end of the upper rubber cylinder sealing mechanism (33) is connected to a lug spindle (24), and a through hole for the oil pipe pressure to pass through is opened on the lug spindle (24); The lug spindle (24) is provided with a mechanical slip mechanism (35) for preventing the packer from moving downward and a friction block mechanism (36) for achieving the setting of the packer.

2. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 1, characterized in that: The hydraulic anchor mechanism (31) comprises a hydraulic anchor body (1) and a volume tube (2), the hydraulic anchor body (1) is connected to a hydraulic anchor slip assembly (3), the volume tube (2) is located inside the hydraulic anchor body (1) and penetrates a pressure distribution mechanism (32), an upper rubber cylinder sealing mechanism (33) and a lower rubber cylinder sealing mechanism (34) and is connected to a lug spindle (24); An annular space is formed between the outer wall of the volume tube (2), the pressure distribution mechanism (32), the upper rubber cylinder sealing mechanism (33) and the lower rubber cylinder sealing mechanism (34).

3. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 2, characterized in that: The pressure distribution mechanism (32) comprises a pressure distribution outer cylinder (4), which is threadedly connected to the lower end of the hydraulic anchor body (1), a pressure distribution spindle (5) is arranged inside the pressure distribution outer cylinder (4), the volume tube (2) passes through the inner side of the pressure distribution spindle (5), the pressure distribution spindle (5) and the pressure distribution outer cylinder (4) are movably connected, and a double-rubber-enclosed pressure action chamber (29) is formed between the middle part of the pressure distribution spindle (5) and the pressure distribution outer cylinder (4), the lower end of the pressure distribution outer cylinder (4) is connected to an upper rubber cylinder sealing mechanism (33), and an oil filling port (27) is opened on the upper rubber cylinder sealing mechanism (33); The pressure distribution outer cylinder (4) and the upper rubber cylinder sealing mechanism (33) are provided with a pressure distribution pressure transmission channel (25), and the hydraulic oil (26) enters the pressure distribution pressure transmission channel (25) through the oil filling port (27) and flows to the double rubber cylinder closed pressure action chamber (29).

4. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 3, characterized in that: The two ends of the pressure distribution mandrel (5) respectively form an upper tubing pressure action chamber (28) with the hydraulic anchor body (1) and a lower tubing pressure action chamber (30) with the pressure distribution outer cylinder (4); the upper tubing pressure action chamber (28) and the lower tubing pressure action chamber (30) are connected, and the volumes of the upper tubing pressure action chamber (28) and the lower tubing pressure action chamber (30) are smaller than the volume of the double rubber tube enclosed pressure action chamber (29).

5. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 3, characterized in that: The rubber cylinder sealing mechanism (33) comprises a rubber cylinder spindle (6), the volume tube (2) passes through the inner side of the rubber cylinder spindle (6), the rubber cylinder spindle (6) is connected to the lower end of the pressure distribution outer cylinder (4), and the oil filling port (27) is located on the side wall of the rubber cylinder spindle (6), the pressure distribution pressure transmission channel (25) is located inside the rubber cylinder spindle (6), the outer side of the rubber cylinder spindle (6) is sleeved with a rubber cylinder sealing unit (8) for sealing the annular space pressure, the upper end of the rubber cylinder sealing unit (8) is abutted with a top shoe (7), and the top shoe (7) is threadedly connected to the pressure distribution outer cylinder (4); The lower end of the upper rubber cylinder spindle (6) is connected to the lower rubber cylinder sealing mechanism (34), and the lower end of the upper rubber cylinder spindle (6) is connected to the lug spindle (24) via a connecting short section (13).

6. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 5, characterized in that: The lower rubber cylinder sealing mechanism (34) comprises a lower rubber cylinder spindle (9) connected to the upper rubber cylinder spindle (6), one end of the lower rubber cylinder spindle (9) abuts against the top shoe (7), and an annular groove for the hydraulic oil (26) to pass through is formed on the lower rubber cylinder spindle (9) at a position relative to the oil filling port (27); A lower rubber cylinder sealing unit (11) for sealing the oil pipe pressure is sleeved on the lower rubber cylinder core shaft (9); the upper end of the lower rubber cylinder sealing unit (11) is in contact with the lower rubber cylinder core shaft (9); the other end is in contact with a bottom shoe (12); the bottom shoe (12) is connected to an open connecting sleeve (14) at one end away from the lower rubber cylinder sealing unit (11); the open connecting sleeve (14) is located outside the connecting short section (13); the other end of the open connecting sleeve (14) is connected to a connecting outer cylinder (15); the connecting outer cylinder (15) is connected to a mechanical cava mechanism (35).

7. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 6, characterized in that: The mechanical slip mechanism (35) comprises a slip sleeve (16) sleeved on the upper end of the lug spindle (24), the slip sleeve (16) being connected to the connecting outer cylinder (15), a slip fixing pin (17) being fixedly connected to the slip sleeve (16), a mechanical slip (18) being inserted into a T-shaped groove of the slip sleeve (16), and the slip fixing pin (17) being hooked to the mechanical slip (18) to prevent the mechanical slip (18) from falling off.

8. The double-rubber pressure distribution packer for high-temperature and high-pressure wells according to claim 7, characterized in that: The friction block mechanism (36) comprises a friction block outer cylinder (22) sleeved on the lower end of the lug core shaft (24); the friction block outer cylinder (22) is connected to the mechanical slip mechanism (35) via an open ring hoop (19); a friction block (20) is arranged on the friction block outer cylinder (22); the friction block outer cylinder (22) and the friction block (20) are connected and fixed via a pressure block (23); a cavity is formed between the friction block (20) and the friction block outer cylinder (22); a friction block spring (21) is arranged in the cavity.

Images