Steam injection thermal recovery packer

Abstract

The utility model discloses a steam injection thermal recovery packer, and relates to the technical field of oil field downhole tools. The lower portion of the upper connector is connected with a center pipe through threads and a sealing assembly, the lower portion of the center pipe is connected with a lower connector through threads and a sealing assembly, the outer circle of the upper connector extends downwards to form a supporting pipe, the supporting pipe is sleeved with a cone, the outer circle of the cone is a conical face which is shrunk downwards, the cone is sleeved with a rubber sleeve, and an inner hole of the rubber sleeve is the same as the outer conicity of the cone. And a deblocking pin is arranged between the cone and the supporting tube. The packer has the advantages that the two packers share the same ball seat sleeve, the upper packer and the lower packer are set in sequence, the steel ball is reserved in the lower packer, steam is blocked, a special blocking cap is omitted, the setting sleeve is in one-way tooth connection with the supporting pipe, rubber sleeve setting can be achieved through single-time pressure rising, and the packer is simple in structure and convenient to use. The setting time is short, unsetting can be achieved by lifting a tubular column, meanwhile, the environment temperature of the rubber sleeve is improved, and the service life of the rubber sleeve is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to oilfield downhole tool technical field especially relates to a steam injection thermal recovery packer. BACKGROUND

[0002] When injecting steam in the oilfield thermal recovery well, high-temperature and high-pressure thermal recovery packers are generally installed on the steam injection pipe string above and below the stratum to seal the stratum and prevent steam from flowing into the casing to cause heat loss. The thermal recovery packer deforms to drive the vertebral body into the rubber sleeve after being heated by the thermal sensitive element on the packer, and the rubber sleeve expands to the inner wall of the casing to be set. When unsetting is needed, the wellbore temperature needs to be lowered to a certain temperature before unsetting. The steam loss is large during the setting process, and the unsetting time is long.

[0003] CN 208330265 U discloses a steam injection thermal recovery packer, which sets a single valve closed pipe string. When injecting steam into the well, the rubber sleeve is set by the piston rising and the locking mechanism under high pressure. This solves the above problems. However, when injecting steam into the stratum, two thermal recovery packers need to be installed above and below the stratum. When the upper thermal recovery packer falls into the lower thermal recovery packer after setting, the lower packer cannot be set. Therefore, the technical solution needs to be improved. SUMMARY

[0004] To solve the problem of large steam loss and long unsetting time of the thermal sensitive element thermal recovery packer during setting, the utility model provides a steam injection thermal recovery packer.

[0005] The utility model provides a technical scheme: a steam injection thermal recovery packer, which comprises an upper joint, a center pipe connected to the lower part of the upper joint through threads and a sealing assembly, a lower joint connected to the lower part of the center pipe through threads and a sealing assembly, a support pipe extended downward from the outer circle of the upper joint, a vertebral body sleeved on the support pipe, a conical surface downwardly reduced on the outer circle of the vertebral body, a rubber sleeve sleeved on the outer side of the vertebral body, the inner hole of the rubber sleeve having the same conical degree as the outer circle of the vertebral body, and an unsetting pin arranged between the vertebral body and the support pipe.

[0006] The outer circle of the lower joint is extended upward to form an outer pipe, a piston is arranged between the outer pipe and the center pipe, the piston and the outer pipe and the center pipe are gap fitted through the sealing assembly, the center pipe is provided with a steam inlet hole below the piston, the upper part of the piston is provided with a setting sleeve, the setting sleeve is clamped between the top of the piston and the bottom of the rubber sleeve, the setting sleeve and the support pipe are connected through a one-way tooth, the one-way tooth allows the setting sleeve to rise along the support pipe but not to fall, and a compression spring is arranged between the setting sleeve and the vertebral body in the axial direction.

[0007] The inner hole of the lower joint is provided with a ball seat sleeve, the inner hole of the ball seat sleeve is processed with a conical surface, the ball seat sleeve can be sealed and connected with a steel ball, the ball seat sleeve and the lower joint are sealed and connected through the sealing assembly, and the lower joint is provided with a ball seat pin below the ball seat sleeve.

[0008] There is an annular space between the support pipe and the center pipe, and the support pipe is threadedly connected with a support cover at the bottom, and the inner hole of the support cover is in clearance fit with the center pipe.

[0009] The sealing assembly structures are same, and the sealing assembly between the piston and the outer pipe is taken as an example, a downward stepped shaft is formed on the outer circle of the piston, a plurality of graphite rings are filled in the annular space between the stepped shaft of the piston and the outer pipe, the plurality of graphite rings are stacked in the up-down direction, the lower end surface of the piston is connected with a gland through bolts, and a butterfly spring is arranged between the gland and the graphite rings.

[0010] The upper portion of the support pipe is provided with a circular convex platform, and the outer circle of the convex platform is larger than the outer circle of the vertebral body.

[0011] The beneficial effect of the utility model is: the utility model discloses a ball seat sleeve is shared by two packers, and the two packers are set in order, and the steel ball is left in the lower packer, and steam is blocked, so that the special blocking cap is not needed to be installed, the setting sleeve is connected with the support pipe through the one-way tooth, the rubber sleeve setting can be realized by single pressure, the setting time is short, the pipe column can be lifted to be unblocked, the environmental temperature of the rubber sleeve is improved, and the service life of the rubber sleeve is improved. BRIEF DESCRIPTION OF DRAWINGS

[0012] BRIEF DESCRIPTION OF DRAWINGS Figure 1 It is the structural schematic diagram of the utility model;

[0013] BRIEF DESCRIPTION OF DRAWINGS Figure 2 It is the A place enlarged view of the attached Figure 1 BRIEF DESCRIPTION OF DRAWINGS

[0014] BRIEF DESCRIPTION OF DRAWINGS Figure 3 It is the B place enlarged view of the attached Figure 1 BRIEF DESCRIPTION OF DRAWINGS

[0015] BRIEF DESCRIPTION OF DRAWINGS Figure 4 It is the setting structure schematic diagram of the utility model;

[0016] BRIEF DESCRIPTION OF DRAWINGS Figure 5 It is the unblocking structure schematic diagram of the utility model;

[0017] BRIEF DESCRIPTION OF DRAWINGS Figure 6 It is the installation drawing of the utility model.

[0018] In the drawing, 1 is an upper joint, 101 is a convex platform, 102 is a support pipe, 2 is a rubber sleeve, 3 is a center pipe, 4 is a vertebral body, 5 is a setting sleeve, 6 is a piston, 7 is a lower joint, 701 is an outer pipe, 8 is a steam inlet hole, 9 is a one-way tooth, 10 is a ball seat sleeve, 11 is a ball seat pin, 12 is a steel ball, 13 is a butterfly spring, 14 is a graphite ring, 15 is a gland, 16 is an annular space, 17 is a support cover, 18 is a compression spring, and 19 is an unblocking pin. DETAILED DESCRIPTION

[0019] AsFigures 1-6 As shown in the figure, a steam injection thermal recovery packer comprises an upper joint 1, the lower part of the upper joint 1 is connected to a central pipe 3 through a thread and sealing assembly, the lower part of the central pipe 3 is connected to a lower joint 7 through a thread and sealing assembly, the outer circle of the upper joint 1 extends downward to form a support pipe 102, a vertebra 4 is sleeved on the support pipe 102, the outer circle of the vertebra 4 is a downwardly tapered conical surface, a rubber sleeve 2 is sleeved on the outside of the vertebra 4, the inner hole of the rubber sleeve 2 has the same taper as the outer circle of the vertebra 4, and a debonding pin 19 is arranged between the vertebra 4 and the support pipe 102;

[0020] The outer circle of the lower joint 7 extends upward to form an outer pipe 701, a piston 6 is arranged between the outer pipe 701 and the central pipe 3, the piston 6 is in clearance fit with the outer pipe 701 and the central pipe 3, the central pipe 3 is provided with a steam inlet hole 8 below the piston 6, a setting sleeve 5 is arranged on the upper part of the piston 6, the setting sleeve 5 is clamped between the top of the piston 6 and the bottom of the rubber sleeve 2, the setting sleeve 5 is connected to the support pipe 102 through a one-way tooth 9, the one-way tooth 9 allows the setting sleeve 5 to ascend along the support pipe 102 but not to descend, and a compression spring 18 is arranged in axial installation between the setting sleeve 5 and the vertebra 4;

[0021] The inner hole of the lower joint 7 is provided with a ball seat sleeve 10, the inner hole of the ball seat sleeve 10 is processed to have a conical surface, the ball seat sleeve 10 can be in sealing connection with a steel ball 12, the ball seat sleeve 10 is in sealing connection with the lower joint 7 through a sealing assembly, and the lower joint 7 is provided with a ball seat pin 11 below the ball seat sleeve 10;

[0022] The upper and lower packers are lowered to the steam injection and recovery formation together with a pipe string, the lower packer is not provided with the ball seat sleeve 10, the steel ball 12 is put into the pipe string, the steel ball 12 is sealed on the ball seat sleeve 10 of the upper packer, the pipe string is pressurized or steam injection is performed, the piston 6 and the setting sleeve 5 are pushed to ascend, the rubber sleeve 2 is deformed to expand outward, the setting sleeve 5 does not descend after ascending, the rubber sleeve 2 is set on the inner wall of the casing, the pipe string is pressurized again, the ball seat pin 11 is cut off, the ball seat sleeve 10 is lowered to the ball seat pin 11 of the lower packer together with the steel ball 12, the pressurization is repeated, and the lower packer is set.

[0023] When debonding, the pipe string is pulled up, the rubber sleeve 2 is tightly combined with the vertebra 4, the debonding pin 19 is cut off, the vertebra 4 ascends under the action of the compression spring 18, and the rubber sleeve 2 retracts to be debonded.

[0024] There is an annulus 16 between the support pipe 102 and the central pipe 3, the bottom of the support pipe 102 is threadedly connected to a support cover 17, the inner hole of the support cover 17 is in clearance fit with the central pipe 3, when steam injection is performed, the temperature of the central pipe 3 is almost the same as that of the steam, the annulus 16 can separate the heat of the central pipe 3, the environmental temperature of the rubber sleeve 2 is reduced, and the service life of the rubber sleeve 2 is improved.

[0025] The utility model discloses a ball seat sleeve 10 is set up with two packers, and the upper and lower packers are set in order, and the steel ball 12 is left in the lower packer, and the steam is blocked, and the special blocking cap is dispensed with, and the setting sleeve 5 is connected with the support pipe 102 through the one-way tooth 9, and the rubber tube 2 setting can be realized through single pressure, the setting time is short, and the pipe string can be lifted to be unblocked, and the environmental temperature of the rubber tube 2 is improved, and the service life of the rubber tube 2 is improved.

[0026] The sealing assembly structures are all same, and taking the sealing assembly between the piston 6 and the outer tube 701 as an example, a downward stepped shaft is formed in the outer circle of the piston 6, the annular space between the stepped shaft of the piston 6 and the outer tube 701 is filled with a plurality of graphite rings 14, the plurality of graphite rings 14 are stacked in the up-down direction, the lower end surface of the piston 6 is connected with the gland 15 through bolts, the butterfly spring 13 is installed between the gland 15 and the graphite ring 14, and the high-temperature and high-pressure resistant graphite ring 14 is suitable for the sealing environment of the thermal recovery packer.

[0027] The support pipe 102 is provided with the annular boss 101 at the upper portion, the outer circle of the boss 101 is greater than the outer circle of the vertebral body 4, and the boss 101 is used for limiting the vertebral body 4 after unblocking.

Claims

1. A steam injection thermal recovery packer, comprising an upper joint (1), characterized in that: The lower part of the upper joint (1) is connected to the central tube (3) through a thread and a sealing assembly, and the lower part of the central tube (3) is connected to the lower joint (7) through a thread and a sealing assembly. A support tube (102) extends downward from the outer circle of the upper joint (1), and a cone (4) is sleeved on the support tube (102). The outer circle of the cone (4) is a conical surface that shrinks downward. A rubber tube (2) is sleeved on the outer side of the cone (4). The inner hole of the rubber tube (2) has the same taper as the outer circle of the cone (4). An unsealing pin (19) is provided between the cone (4) and the support tube (102); An outer tube (701) extends upward from the outer circle of the lower joint (7), a piston (6) is provided between the outer tube (701) and the center tube (3), the piston (6), the outer tube (701) and the center tube (3) are fitted with each other through a sealing assembly gap, the center tube (3) is provided with a steam inlet hole (8) below the piston (6), a seating sleeve (5) is provided on the upper part of the piston (6), the seating sleeve (5) is clamped between the top of the piston (6) and the bottom of the rubber cylinder (2), the seating sleeve (5) is connected to the support tube (102) through a one-way tooth (9), the one-way tooth (9) enables the seating sleeve (5) to rise but not fall along the support tube (102), and an axially mounted compression spring (18) is provided between the seating sleeve (5) and the vertebral body (4); The inner hole of the lower joint (7) is provided with a ball seat sleeve (10), the inner hole of the ball seat sleeve (10) is processed with a conical surface, the ball seat sleeve (10) can be sealed and connected with the steel ball (12), the ball seat sleeve (10) and the lower joint (7) are sealed and connected via a sealing assembly, and the lower joint (7) is provided with a ball seat pin (11) at the bottom of the ball seat sleeve (10); There is an annulus (16) between the support tube (102) and the center tube (3). The bottom of the support tube (102) is threadedly connected to the support cover (17), and the inner hole of the support cover (17) is clearance-matched with the center tube (3).

2. The steam injection thermal recovery packer according to claim 1, characterized in that: The sealing components are all of the same structure. Taking the sealing component between the piston (6) and the outer tube (701) as an example, the outer circle of the piston (6) is provided with a downward-facing stepped shaft, and the annular space between the stepped shaft of the piston (6) and the outer tube (701) is filled with a plurality of graphite rings (14). The plurality of graphite rings (14) are stacked in the vertical direction, and the lower end surface of the piston (6) is connected to the pressure cover (15) by bolts, and a butterfly spring (13) is installed between the pressure cover (15) and the graphite ring (14).

3. The steam injection thermal recovery packer according to claim 1, characterized in that: A circular boss (101) is provided on the upper portion of the support tube (102), and the outer circle of the boss (101) is larger than the outer circle of the cone (4).

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