Packer for oil passing pipe

Abstract

The invention relates to the technical field of packers, and provides an oil passing pipe packer which aims at solving the problems that when an existing oil passing pipe packer is used for packing special wells such as a gas storage, an injection and production well and an energy storage well, the sealing performance is insufficient, so that packing fails, and the inner wall of a production pipe column is scratched due to the fact that a laminated steel sheet cannot retract. Comprising a fishing connector, a liquid inlet one-way valve, an elastic telescopic piece, a liquid inlet inner cavity connecting shell, a lifting piston, a liquid inlet channel base, a liquid filling channel base, a central pipe and an outer rubber barrel. The inner surface of the outer rubber sleeve is pressurized to expand the outer rubber sleeve, large-area sealing of the sleeve is achieved, and the sealing performance is improved; during deblocking, the pressure in the outer rubber barrel is released by lifting the fishing joint, barrier-free retraction is performed by utilizing the elastic property of the outer rubber barrel, and deblocking of the tubing packer is realized; the problems that when an existing oil passing pipe packer is used for packing a special well, packing fails due to the insufficient sealing performance, and the inner wall of a production pipe column is scratched due to the fact that the packer is lifted due to the fact that a laminated steel sheet cannot retract are effectively solved.

Description

Technical Field

[0001] The present invention relates to the technical field of packers, and in particular to a through-tubing packer. Background Art

[0002] In gas storage and injection and production wells, packers are used to form a sealed isolation zone in the oil pipe to prevent gas or fluid leakage, thereby controlling flow and pressure difference. In traditional designs, packers generally rely on mechanical devices or fluid power to achieve this sealing function, which is suitable for various injection and production operations, such as water injection, gas injection or natural gas extraction.

[0003] In the prior art, the through-tubing packer is mainly composed of laminated steel sheets, inner and outer rubber tubes, mandrels, etc. During the setting operation, the mandrel is connected to the setting tool, and high-pressure expansion fluid is injected through the injection hole on the mandrel to drive the inner rubber tube to expand, and the laminated steel sheets and the outer rubber tube expand accordingly. The laminated steel sheets and the outer rubber tube are anchored and sealed with the casing wall. Finally, the expansion fluid is sealed by closing the one-way valve of the setting tool, thereby ensuring that the expanded through-tubing packer is in the setting state.

[0004] However, when this type of through-the-tubing packer is used to isolate special wells (such as gas storage, injection and production wells, energy storage wells, etc.), problems such as insufficient sealing performance leading to isolation failure and the inability of the laminated steel sheets to retract causing the packer to lift up and scratch the inner wall of the production tubing string may occur, seriously affecting downhole operations.

[0005] Therefore, how to effectively improve the sealing performance of through-the-tubing packers, smoothly unseal and protect the inner wall of the production tubing has become an issue that cannot be ignored. Research and development of through-the-tubing packer isolation special well technology is of great significance to improving the economic benefits and safety of downhole operation technology. Summary of the invention

[0006] The present invention aims to provide a through-the-tubing packer to solve the problems of insufficient sealing performance leading to isolation failure when using existing through-the-tubing packers to isolate special wells such as gas storage reservoirs, injection and production wells, energy storage wells, and the inability of laminated steel sheets to retract, causing the packer to lift up and scratch the inner wall of the production tubing.

[0007] The present invention is achieved by adopting the following technical solutions:

[0008] The present invention provides a through-oil pipe packer, comprising a fishing joint, a liquid inlet one-way valve, an elastic telescopic member, a liquid inlet inner cavity connecting shell, a lifting piston, a liquid inlet channel base, a liquid filling channel base, a central tube and an outer rubber tube;

[0009] The liquid inlet check valve and the elastic telescopic member are installed inside the salvage joint, the upper part of the liquid inlet check valve abuts against the inner wall surface of the salvage joint, the lower part of the salvage joint is connected to the lifting piston, one end of the elastic telescopic member abuts against the liquid inlet check valve, and the other end of the elastic telescopic member abuts against the lifting piston;

[0010] The liquid inlet inner cavity connecting shell is sleeved on the lower part of the salvage joint and connected to the upper part of the liquid inlet channel base; a first liquid inlet hole is opened on the salvage joint, and the first liquid inlet hole connects the lower part of the salvage joint with the liquid inlet inner cavity connecting shell;

[0011] The upper end of the outer rubber tube is connected to the lower end of the liquid inlet channel base, and the lower end of the outer rubber tube is connected to the lower structure of the through-tubing packer;

[0012] The outer rubber sleeve is sleeved on the outside of the liquid filling channel base, a central tube is arranged inside the liquid filling channel base, one end of the central tube is connected to the liquid inlet channel base, an annular inner cavity is formed between the central tube and the liquid filling channel base, a second liquid inlet hole is opened on the liquid inlet channel base, and the second liquid inlet hole connects the liquid inlet inner cavity connection shell with the annular inner cavity;

[0013] The lower end of the liquid filling channel base is connected with a stopper, the stopper closes one end of the annular inner cavity, and the lower end of the outer rubber tube can abut against the stopper;

[0014] A pressure transmission hole is provided on the side wall of the liquid filling channel base, and the pressure transmission hole is communicated with the annular inner cavity.

[0015] Through the above structure, the through-tubing packer can be set, specifically: pressurizing the inside of the salvage joint to activate the liquid inlet one-way valve. Under the action of pressure, the liquid inlet one-way valve compresses the elastic telescopic part and moves downward. The pressure enters the liquid inlet inner cavity connecting the shell through the first liquid inlet hole on the salvage joint, and enters the annular inner cavity sealed by the liquid filling channel base and the center pipe through the second liquid inlet hole of the liquid inlet channel base. At this time, the pressure acts on the inner surface of the outer rubber tube through the pressure transmission hole, causing the outer rubber tube to expand outward until the outer rubber tube completely seals the casing. Then the liquid inlet one-way valve returns to its position, and the pressure is trapped inside the through-tubing packer to achieve setting.

[0016] The present invention achieves a large-area sealing sleeve by pressurizing the inner surface of the outer rubber tube to make it expand and dilate the sealing sleeve, thereby improving the sealing performance. When unsealing, the pressure inside the outer rubber tube is released through the first liquid inlet hole (pressure relief hole) by lifting the salvage joint, and the outer rubber tube can be retracted without obstacle by utilizing the elasticity of the outer rubber tube, thereby achieving smooth unsealing of the through-the-tubing packer. The present invention effectively solves the problem of insufficient sealing performance leading to sealing failure when the existing through-the-tubing packer is used to seal special wells such as gas storage reservoirs, injection and production wells, and energy storage wells, and the problem of the laminated steel sheets being unable to retract causing the packer to scratch the inner wall of the production tubing string when it is lifted up.

[0017] When the through-the-tubing packer of the present invention is set, since the block closes one end of the annular inner cavity, the pressure in the annular inner cavity acts on the inner surface of the outer rubber tube through the pressure transmission hole, causing the outer rubber tube to expand outward. When the outer rubber tube expands, it will drive the lower structure of the through-the-tubing packer to move axially along the axial direction of the liquid-filled channel base. During the pressurized expansion process of the outer rubber tube, during the initial pressurization, the middle of the outer rubber tube gradually expands, and its length in the axial direction becomes shorter. The outer rubber tube and the structure connected below it move upward along the liquid-filled channel base; when the outer rubber tube expands and sets, the pressurization continues, and the outer rubber tube is axially stretched and lengthened. Since the lower end of the outer rubber tube can abut against the block, when it moves downward and contacts the block, the block limits the axial movement, and the outer rubber tube no longer extends along its axial direction.

[0018] Since the lower end of the outer rubber tube can drive the lower structure of the through-tubing packer to move axially upward along the axial direction of the liquid filling channel base when the outer rubber tube is initially pressurized, and the lower end of the outer rubber tube can move axially downward and abut against the stopper when the outer rubber tube expands and sets and continues to be pressurized, the present invention also has the following advantages:

[0019] 1. Enhanced axial stability: The outer rubber tube can move axially during the expansion process and contact with the block to limit the position, avoiding excessive elongation. This can improve the stability of the overall structure of the through-tubing packer and prevent unexpected failure under complex working conditions.

[0020] 2. Adaptive deformation: The outer rubber cylinder can expand and contract adaptively according to the changes in the inner cavity pressure, which improves the flexibility and adaptability of the equipment under different working conditions.

[0021] As the preferred technical solution:

[0022] The elastic telescopic member may be, but is not limited to, a spring.

[0023] As the preferred technical solution:

[0024] The salvage joint is connected to the lifting piston via threads.

[0025] As the preferred technical solution:

[0026] The liquid inlet inner cavity connecting shell is connected to the liquid inlet channel base through threads.

[0027] As the preferred technical solution:

[0028] The central tube is connected to the liquid inlet channel base via threads.

[0029] As the preferred technical solution:

[0030] The outer rubber tube is made of high-strength elastic material.

[0031] As the preferred technical solution:

[0032] The high-strength elastic material includes but is not limited to hydrogenated nitrile rubber, fluororubber, etc.

[0033] The elongation after break of hydrogenated nitrile rubber can reach about 600%. When the through-the-tubing packer begins to be unsealed, the internal pressure of the outer rubber tube is released through the first liquid inlet hole (pressure relief hole) by lifting the salvage joint. Since the outer rubber tube is made of this material, it can retract without obstacles, thereby realizing the smooth unsealing of the through-the-tubing packer.

[0034] As the preferred technical solution:

[0035] Fibers are added into the high-strength elastic material, and the fibers are arranged along the axis of the outer rubber tube. The fibers at both ends of the outer rubber tube have a greater density than the fibers in the middle thereof.

[0036] Fibers are used as reinforcing materials. The tensile strength of the area with high fiber density is improved. The fibers are densely distributed at both ends of the outer rubber tube, which can enhance the strength of the outer rubber tube and prevent the outer rubber tube from continuously deforming after high-pressure expansion, which eventually causes the rubber to roll to both sides along the annular space, and may eventually cause a pressure explosion. In addition, the fibers arranged along the axis have little effect on radial expansion, can significantly control the axial tensile capacity, and make the axial elongation of the outer rubber tube controllable.

[0037] As the preferred technical solution:

[0038] A balancing hole is provided on the base of the liquid inlet channel, the balancing hole is connected to one end of the central tube, and the other end of the central tube is connected to the outside;

[0039] A sliding unsealing cover is installed on the liquid inlet channel base, the sliding unsealing cover seals the balance hole, and the sliding unsealing cover is connected to the liquid inlet channel base through a first shearing mechanism.

[0040] The first shearing mechanism is destroyed by inserting a special tool, and the sliding unsealing cover slides open to release the seal of the balance hole. The pressure in the lower space of the outer rubber tube will enter the upper space of the outer rubber tube through the center tube and the balance hole. The sliding unsealing cover serves as a balance valve. Opening it can connect the upper and lower annuli of the through-tubing packer. The lower pressure of the through-tubing packer is released through the center tube to achieve the balance of the upper and lower pressures of the through-tubing packer, which is convenient for the smooth removal of the through-tubing packer.

[0041] As the preferred technical solution:

[0042] The first shearing mechanism uses a shear pin for sliding unsealing cover.

[0043] As the preferred technical solution:

[0044] The lower part of the lifting piston extends into the upper part of the liquid inlet channel base, and a second shearing mechanism is installed between the liquid inlet channel base and the lifting piston.

[0045] When the through-tubing packer is unsealed, the fishing joint is lifted, the second shear mechanism is destroyed, the pressure in the annular inner cavity enters the liquid inlet inner cavity connecting shell through the second liquid inlet hole, the pressure enters the fishing joint through the side hole on the lifting piston, and is discharged through the first liquid inlet hole (pressure relief hole) on the fishing joint, thus realizing the unsealing of the packer. The side hole on the lifting piston is closed by the liquid inlet channel base during the setting of the packer.

[0046] As the preferred technical solution:

[0047] The second shearing mechanism adopts a shear pin for lifting the piston.

[0048] As the preferred technical solution:

[0049] The upper end of the outer rubber tube is connected to the lower end of the liquid inlet channel base through an upper protective hoop joint, and the outer rubber tube is fixedly connected to the upper protective hoop joint;

[0050] The lower end of the outer rubber tube is connected to the lower structure of the through-tubing packer through a lower protective hoop joint, and the outer rubber tube is fixedly connected to the lower protective hoop joint.

[0051] As the preferred technical solution:

[0052] A first clamping piece is connected between the upper guard hoop joint and the liquid filling channel base, a second clamping piece is installed between the lower guard hoop joint and the liquid filling channel base, the second clamping piece is connected to the lower guard hoop joint, axial displacement can occur between the second clamping piece and the liquid filling channel base, and the outer rubber tube abuts against the stopper through the second clamping piece.

[0053] When the outer rubber tube expands, axial movement will occur. During the process of pressurized expansion of the outer rubber tube, during the initial pressurization, the middle of the outer rubber tube gradually expands, and its length in the axial direction becomes shorter. The outer rubber tube and the connecting structure below it move upward along the base of the liquid filling channel; when the outer rubber tube expands and seals, and continues to be pressurized, the outer rubber tube is axially stretched and lengthened. Since the second clamping piece can abut against the block, when the second clamping piece moves downward and contacts the block, the block limits the axial movement, and the outer rubber tube no longer extends along its axial direction.

[0054] The first pressing member has the function of connecting the liquid filling channel base and the upper protective hoop joint at the same time, and sealing the upper end of the annular space area surrounded by the liquid filling channel base and the outer rubber tube.

[0055] The second clamping member is used to connect the lower protective hoop joint and seal the lower end of the annular space area surrounded by the base of the liquid-filled channel and the outer rubber tube, so that the outer rubber tube can be axially displaced when it expands.

[0056] As the preferred technical solution:

[0057] The first pressing member is connected to the upper protective hoop joint and the liquid filling channel base through threads.

[0058] As the preferred technical solution:

[0059] The second pressing piece is connected to the lower protective hoop joint through threads.

[0060] As the preferred technical solution:

[0061] The two ends of the outer rubber cylinder are respectively connected with a first clamping ring and a second clamping ring, the first clamping ring abuts against the first clamping piece, and the second clamping ring abuts against the second clamping piece.

[0062] The function of the clamping ring is to better cooperate with the assembly of the clamping piece and enhance the sealing effect of the clamping piece.

[0063] As the preferred technical solution:

[0064] The outer rubber cylinder is connected to the clamping ring and the guard hoop joint by heating and vulcanization. A special mold is made to determine the relative positions of the parts, and raw rubber is poured into the special mold. The upper and lower guard hoop joints, the clamping ring and the outer rubber cylinder are vulcanized into a whole by heating and vulcanization. They can be directly installed during assembly, which greatly saves on-site installation time.

[0065] As the preferred technical solution:

[0066] The liquid inlet channel base is connected to the upper protective hoop joint through a connecting piece.

[0067] As the preferred technical solution:

[0068] The connecting piece is connected to the liquid inlet channel base and the upper protective hoop joint through threads.

[0069] As the preferred technical solution:

[0070] The lower structure of the through-tubing packer includes an axial sliding member and an anti-premature setting matching member;

[0071] The axial sliding member is connected to the lower protective hoop joint, and the anti-early setting fitting member includes a first anti-early setting fitting member and a second anti-early setting fitting member, the first anti-early setting fitting member is connected to the axial sliding member, the second anti-early setting fitting member is sleeved on the outside of the center pipe and abuts against the lower end of the limiting step on the outer surface of the center pipe, and the first anti-early setting fitting member and the second anti-early setting fitting member are connected by a third shearing mechanism;

[0072] The lower end of the central tube is connected with a guide shoe.

[0073] When the through-tubing packer is set, the outer rubber tube expands and produces axial movement. During initial pressurization, the middle of the outer rubber tube gradually expands, and its length in the axial direction becomes shorter. The lower protective hoop joint drives the axial sliding part and the first anti-early setting fitting part to move upward, and the third shearing mechanism between the first anti-early setting fitting part and the second anti-early setting fitting part is destroyed, thereby realizing axial displacement compensation for the upward movement of the outer rubber tube until the outer rubber tube completely seals the casing.

[0074] The anti-premature setting device and guide shoe are designed to prevent the outer rubber tube from rubbing against the casing wall and causing premature setting and deformation when the packer is lowered.

[0075] As the preferred technical solution:

[0076] The third shearing mechanism adopts a shear pin for the anti-premature setting fitting.

[0077] As the preferred technical solution:

[0078] The axial sliding member is connected to the lower guard hoop joint and the first anti-early setting fitting by threads.

[0079] As the preferred technical solution:

[0080] The guide shoe is connected to the central tube via threads.

[0081] As the preferred technical solution:

[0082] Sealing rings are installed between the liquid inlet one-way valve and the salvage joint, between the salvage joint and the lifting piston, between the liquid inlet inner cavity connecting shell and the salvage joint, between the liquid inlet inner cavity connecting shell and the liquid inlet channel base, between the connecting piece and the liquid inlet channel base, between the connecting piece and the upper guard hoop joint, between the upper guard hoop joint and the first clamping piece, between the first clamping piece and the liquid filling channel base, between the second clamping piece and the liquid filling channel base, between the lower guard hoop joint and the axial sliding piece, between the center pipe and the liquid inlet channel base, between the axial sliding piece and the center pipe, and between the guide shoe and the center pipe.

[0083] As the preferred technical solution:

[0084] The ends of the upper protective hoop joint and the lower protective hoop joint that contact the outer rubber tube are chamfered or rounded to avoid stress concentration at a certain point of the outer rubber tube when it expands under pressure, resulting in failure of the through-tubing packer to be sealed.

[0085] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0086] 1. The through-the-tubing packer of the present invention is easy to install. By pressurizing the inner surface of the outer rubber tube to expand and dilate the sealing sleeve, a large-area sealing sleeve is achieved, thereby improving the sealing performance. By utilizing the elasticity of the outer rubber tube, the pressure inside the outer rubber tube is released through the pressure relief hole by lifting the salvage joint, and the outer rubber tube can be retracted without obstacle, thereby achieving smooth unsealing of the through-the-tubing packer. It effectively solves the problems of insufficient sealing performance leading to sealing failure of existing through-the-tubing packers when sealing special wells such as gas storage reservoirs, injection and production wells, and energy storage wells, and the problem of the laminated steel sheets being unable to retract, resulting in the packer being pulled up and scratching the inner wall of the production tubing.

[0087] 2. The outer rubber cylinder of the present invention adopts high-strength elastic material and utilizes the inherent characteristics of high-strength elastic material (superelasticity, high elongation after fracture, and high expansion ratio) to effectively avoid the problems of insufficient sealing performance leading to sealing failure and the inability of the laminated steel sheets to retract causing the packer to be lifted and scratch the inner wall of the production tubing when the existing through-the-tubing packer is used to seal special wells (such as gas storage, injection and production wells, energy storage wells, etc.). The sealing performance of the through-the-tubing packer is enhanced, the success rate and safety of the downhole unsealing operation of the through-the-tubing packer are improved, and the service life of the through-the-tubing packer is extended.

[0088] 3. The sealing system of the oil pipe packer of the present invention is composed of upper and lower protective hoop joints, an outer rubber tube, a clamping piece, a clamping ring and a liquid filling channel base. By pressurizing and expanding the inner surface of the outer rubber tube, the outer rubber tube expands and seals the sleeve, thereby achieving a large-area sealing sleeve and improving the sealing performance.

[0089] 4. The setting and unsealing functions of the through-tubing packer of the present invention are both realized through the coordinated movement of mechanical parts, so the probability of error is small and the success rate is high.

[0090] 5. The tubing packer of the present invention has upper and lower protective hoop joints, an outer rubber sleeve and a clamping ring which are vulcanized and connected as a whole by heating and vulcanizing during processing, and can be directly installed during assembly, greatly saving on-site installation time.

[0091] 6. The through-tubing packer of the present invention has the ends of the upper and lower protective hoop joints in contact with the outer rubber tube chamfered or rounded to avoid stress concentration at a certain point when the outer rubber tube expands under pressure, resulting in failure of the through-tubing packer to be set.

[0092] 7. For the through-the-tubing packer of the present invention, when the unsealing operation begins, the balance valve is opened to connect the upper and lower annuli of the through-the-tubing packer. The unsealing mechanism is a shear pin for a sliding unsealing cover. Unsealing is achieved by shearing the shear pin for the sliding unsealing cover. The lower pressure of the through-the-tubing packer is released through the central pipe to achieve a balance between the upper and lower pressures of the through-the-tubing packer, thereby facilitating the smooth removal of the through-the-tubing packer.

[0093] 8. The through-tubing packer of the present invention is designed with an anti-premature setting device and a guide shoe to prevent the outer rubber tube from rubbing against the casing wall and deforming in advance when the packer is lowered.

[0094] 9. The through-tubing packer of the present invention, except for the parts that need to be vulcanized, the other parts are connected by detachable mechanical means. During maintenance, only the broken parts need to be taken out and replaced with new ones, which greatly saves processing materials and costs.

[0095] 10. The through-the-tubing packer of the present invention is provided with thread backing grooves at places where threads need to be processed, and a sealing ring is also provided thereafter to ensure that the sealing performance of the entire through-the-tubing packer sealing system is good.

[0096] 11. The through-tubing packer of the present invention is provided with flat washers at all locations where shear pins and screws are required for connection, so as to avoid direct contact between components and reduce wear. BRIEF DESCRIPTION OF THE DRAWINGS

[0097] Figure 1 It is a front view of the through-tubing packer described in the present invention.

[0098] Figure 2 It is a schematic diagram of the three-dimensional structure of the through-tubing packer described in the present invention.

[0099] Figure 3 It is a cross-sectional view of the through-tubing packer described in the present invention.

[0100] Figure 4 for Figure 3 Partial schematic Figure 1 .

[0101] Figure 5 for Figure 3 Partial schematic Figure 2 .

[0102] Figure 6 for Figure 3 Partial schematic Figure 3 .

[0103] Figure 7 It is a partial schematic cross-sectional view of the outer rubber cylinder of the present invention.

[0104] Figure 8 It is a schematic diagram of the three-dimensional structure of the lifting piston described in the present invention.

[0105] Fig. 9 It is a half-section view of the lifting piston described in the present invention.

[0106] Fig.10 It is a schematic diagram of the three-dimensional structure of the liquid inlet channel base described in the present invention.

[0107] Fig.11 It is a half-section view of the liquid inlet channel base described in the present invention.

[0108] Fig.12 It is a schematic diagram of the three-dimensional structure of the liquid-filled channel base described in the present invention.

[0109] Fig.13 It is a schematic diagram of the upper end of the liquid-filled channel base described in the present invention.

[0110] Fig.14 It is a schematic diagram of the lower end of the liquid-filled channel base described in the present invention.

[0111] Fig.15 It is a schematic diagram of the three-dimensional structure of the stopper described in the present invention.

[0112] Fig.16 It is a schematic diagram of the setting of the through-tubing packer described in the present invention.

[0113] Fig.17 This is a schematic diagram of the through-the-tubing packer balancing valve of the present invention being opened.

[0114] Fig.18 It is a schematic diagram of unsealing the through-tubing packer of the present invention.

[0115] Fig.19 It is a schematic diagram of the through-the-tubing packer of the present invention being expanded to achieve setting.

[0116] Icons: 1-salvage joint, 2-liquid inlet check valve, 3-spring, 4-liquid inlet cavity connecting shell, 5-lifting piston, 6-liquid inlet channel base, 7-sliding unsealing cover, 8-center tube, 9-upper protective clamp joint, 10-outer rubber cylinder, 11-liquid filling channel base, 12-lower protective clamp joint, 13-axial sliding part, 141-first anti-premature setting matching part, 142-second anti-premature setting matching part, 15-guide shoe, 161-first sealing ring, 162-second sealing ring, 163-third sealing ring, 164-fourth sealing ring, 165-fifth sealing ring, 166-sixth sealing ring, 167-seventh sealing ring, 168-fourth sealing ring, 169-fifth sealing ring, 170-sixth sealing ring, 171-seventh sealing ring, 172-sixth sealing ring, 173-seventh sealing ring, 174-seventh sealing ring, 175-seventh sealing ring, 176-sixth sealing ring, 177-seventh sealing ring, 178-seventh sealing ring, 179-seventh sealing ring, 180-seventh sealing ring, 181-seventh sealing ring, 182-seventh sealing ring, 183-seventh sealing ring, 184-seventh sealing ring, 185-seventh sealing ring, 186-seventh sealing ring, 187-seventh sealing ring, 188-seventh sealing ring, 189-seventh sealing ring, 190-191 9-the ninth sealing ring, 1610-the tenth sealing ring, 1611-the eleventh sealing ring, 1612-the twelfth sealing ring, 1613-the thirteenth sealing ring, 1614-the fourteenth sealing ring, 17-the first liquid inlet hole, 18-the second liquid inlet hole, 19-the balance hole, 20-the annular inner cavity, 21-the pressure transmission hole, 22-the side hole, 23-the shear pin for lifting the piston, 24-the shear pin for sliding the unsealing cover, 25-the connecting piece, 261-the first clamping piece, 262-the second clamping piece, 271-the first clamping ring, 272-the second clamping ring, 28-the stopper, 29-the shear pin for the anti-premature setting fitting, 30-the fiber. DETAILED DESCRIPTION

[0117] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0118] Example 1

[0119] like Figure 1-Figure 19 As shown, this embodiment proposes a through-oil pipe packer, including a salvage joint 1, a liquid inlet one-way valve 2, a spring 3, a liquid inlet inner cavity connecting shell 4, a lifting piston 5, a liquid inlet channel base 6, a sliding unsealing cover 7, a center pipe 8, an upper protective hoop joint 9, an outer rubber tube 10, a liquid filling channel base 11, a lower protective hoop joint 12, an axial sliding part 13, an anti-premature setting fitting, a guide shoe 15, etc.

[0120] The liquid inlet check valve 2 and the spring 3 are installed from the bottom of the salvage joint 1 to the inside of the salvage joint 1. The upper part of the liquid inlet check valve 2 abuts against the inner wall surface of the salvage joint 1. The lower part of the salvage joint 1 is connected to the upper part of the lifting piston 5 through threads. The upper end of the spring 3 abuts against the liquid inlet check valve 2, and the lower end of the spring 3 abuts against the lifting piston 5. A first sealing ring 161 is installed between the liquid inlet check valve 2 and the salvage joint 1, and a third sealing ring 163 is installed between the salvage joint 1 and the lifting piston 5.

[0121] The liquid inlet inner cavity connection shell 4 is sleeved on the lower part of the salvage joint 1, and the liquid inlet inner cavity connection shell 4 is installed from the bottom of the salvage joint 1. The lower part of the liquid inlet inner cavity connection shell 4 is connected to the upper part of the liquid inlet channel base 6 through threads. A first liquid inlet hole 17 is opened on the side surface of the lower part of the salvage joint 1, and the lower part of the salvage joint 1 is connected to the internal space of the liquid inlet inner cavity connection shell 4 through the first liquid inlet hole 17.

[0122] The lower part of the lifting piston 5 extends into the upper part of the liquid inlet channel base 6, and three shear pins 23 for lifting the piston and gaskets are installed between the liquid inlet channel base 6 and the lifting piston 5 to fix the relative position of the liquid inlet channel base 6 and the lifting piston 5. The shear pin 23 for lifting the piston is connected to the liquid inlet channel base 6 by threads, and a threaded hole is provided on the liquid inlet channel base 6 for the installation of the shear pin 23 for lifting the piston, and one end of the shear pin 23 for lifting the piston can be inserted into the side of the lifting piston 5.

[0123] A second sealing ring 162 is installed between the liquid inlet inner cavity connecting shell 4 and the salvage joint 1 , and a fourth sealing ring 164 is installed between the liquid inlet inner cavity connecting shell 4 and the liquid inlet channel base 6 .

[0124] The outer sleeve of the liquid inlet channel base 6 is provided with a sliding unsealing cover 7, and the sliding unsealing cover 7 is installed from the upper part of the salvage joint 1. Three shear pins 24 for sliding unsealing cover and gaskets are installed between the sliding unsealing cover 7 and the liquid inlet channel base 6 to achieve the relative position fixation of the sliding unsealing cover 7 and the liquid inlet channel base 6. The shear pins 24 for sliding unsealing cover are connected to the sliding unsealing cover 7 by threads, and one end of the shear pins 24 for sliding unsealing cover can be inserted into the side of the liquid inlet channel base 6.

[0125] The center tube 8 is installed inside the liquid inlet channel base 6, and one end of the center tube 8 is inserted into the lower part of the liquid inlet channel base 6. A balancing hole 19 is opened on the upper side of the liquid inlet channel base 6. The interior of the center tube 8 is connected with the balancing hole 19. The sliding unsealing cover 7 covers the balancing hole 19 to close the balancing hole 19. The sliding unsealing cover 7 serves as a balancing valve.

[0126] The lower part of the liquid inlet channel base 6 is connected to the upper protective hoop joint 9 through a connecting piece 25, and the connecting piece 25, the liquid inlet channel base 6 and the upper protective hoop joint 9 are connected through threads.

[0127] A cavity is provided at the lower part of the liquid inlet channel base 6 , and a second liquid inlet hole 18 is opened on the liquid inlet channel base 6 . The second liquid inlet hole 18 connects the liquid inlet inner cavity to the inner space of the shell 4 and communicates with the cavity.

[0128] A sixth sealing ring 166 is installed between the connecting member 25 and the liquid inlet channel base 6 , and a fifth sealing ring 165 is installed between the connecting member 25 and the upper protective hoop joint 9 .

[0129] The outer rubber tube 10 is sleeved on the outside of the liquid filling channel base 11, and the upper protective hoop joint 9 and the lower protective hoop joint 12 are respectively connected to the two ends of the outer rubber tube 10. A first clamping piece 261 is installed in the inner cavity at the upper part of the upper protective hoop joint 9, and the outer circular threaded surface of the first clamping piece 261 is threadedly connected to the upper protective hoop joint 9, and the inner circular threaded surface of the first clamping piece 261 is threadedly connected to the outer circular threaded surface at the upper part of the liquid filling channel base 11; the upper end of the outer rubber tube 10 is also connected to a first clamping ring 271, and the first clamping ring 271 abuts against the first clamping piece 261.

[0130] A second clamping piece 262 is installed in the inner cavity at the lower part of the lower guard hoop joint 12, and the outer threaded surface of the second clamping piece 262 is connected to the lower guard hoop joint 12 by a thread, and the inner threaded surface of the second clamping piece 262 is in contact with the outer circle of the lower part of the liquid filling channel base 11, and axial displacement can occur between the two; the lower end of the outer rubber cylinder 10 is also connected to a second clamping ring 272, and the second clamping ring 272 abuts against the second clamping piece 262.

[0131] A twelfth sealing ring 1612 is installed between the first clamping piece 261 and the upper protective hoop joint 9, a thirteenth sealing ring 1613 is installed between the first clamping piece 261 and the liquid filling channel base 11, and a fourteenth sealing ring 1614 is installed between the second clamping piece 262 and the liquid filling channel base 11.

[0132] In this embodiment, the outer rubber tube 10 is connected to the upper guard hoop joint 9, the lower guard hoop joint 12, the first clamping ring 271, and the second clamping ring 272 by thermal vulcanization. A special mold is made to determine the relative positions of the parts, and raw rubber is poured into the special mold. The upper and lower guard hoop joints 12, the clamping ring, and the outer rubber tube 10 are vulcanized and connected as a whole by thermal vulcanization.

[0133] The lower part of the lower guard ring joint 12 is connected to the upper part of the axial sliding member 13 by threads, the lower part of the axial sliding member 13 is connected to the first anti-premature setting fitting 141 by threads, and the second anti-premature setting fitting 142 is connected to the lower part of the first anti-premature setting fitting 141 by the anti-premature setting fitting shear pin 29, and the relative position of the first anti-premature setting fitting 141 and the second anti-premature setting fitting 142 is fixed by the anti-premature setting fitting shear pin 29.

[0134] A ninth sealing ring 169 is installed between the lower guard hoop joint 12 and the axial sliding member 13 .

[0135] The upper part of the central tube 8 is connected to the inside of the liquid inlet channel base 6 by threads, and the central tube 8 passes through the connector 25, the upper protective hoop joint 9, the liquid filling channel base 11, the lower protective hoop joint 12, the axial sliding member 13, and the anti-premature setting fitting in sequence, and the lower part of the central tube 8 is connected to the guide shoe 15, and the guide shoe 15 is connected to the central tube 8 by threads. The second anti-premature setting fitting 142 is sleeved at the step limit of the lower part of the central tube 8.

[0136] An annular inner cavity 20 is formed between the central tube 8 and the liquid-filling channel base 11 , and the annular inner cavity 20 is connected to the cavity. A pressure transmission hole 21 is provided on the side surface of the liquid-filling channel base 11 .

[0137] The lower end of the liquid filling channel base 11 is connected to a stopper 28 by a screw. On the one hand, the stopper 28 is used to close the lower end of the annular inner cavity 20 so that the pressure entering the annular inner cavity 20 can act on the inner side of the outer rubber tube 10 from the pressure transmission hole 21; on the other hand, the stopper 28 is used to limit the axial displacement direction of the outer rubber tube 10. When the outer rubber tube 10 expands and produces axial displacement, the second clamping member 262 abuts against the stopper 28, and the axial movement is limited by the stopper 28, so that the outer rubber tube 10 no longer extends along its axial direction.

[0138] A seventh sealing ring 167 is installed between the central tube 8 and the liquid inlet channel base 6 , a tenth sealing ring 1610 is installed between the axial sliding member 13 and the central tube 8 , and an eleventh sealing ring 1611 is installed between the guide shoe 15 and the central tube 8 .

[0139] The working principle of the present invention is:

[0140] 1. Setting of through-tubing packer:

[0141] like Fig.16 As shown, pressurization is applied to the inside of the salvage joint 1 to activate the liquid inlet check valve 2. Under the action of pressure, the liquid inlet check valve 2 compresses the spring 3 and moves downward. The high-pressure expansion liquid enters the liquid inlet inner cavity connecting the inner space of the shell 4 through the first liquid inlet hole 17 on the salvage joint 1, enters the cavity of the liquid inlet channel base 6 through the second liquid inlet hole 18 on the liquid inlet channel base 6, and then enters the annular inner cavity 20 sealed by the liquid filling channel base 11 and the central tube 8. Since the lower end of the annular inner cavity 20 is closed by the block 28, at this time, the pressure acts on the inner surface of the outer rubber tube 10 through the pressure transmission hole 21, causing the outer rubber tube 10 to expand outward; the outer rubber tube 10 will produce axial movement when it expands. During the pressurization and expansion process of the outer rubber tube 10, when the pressure is initially applied, the middle of the outer rubber tube 10 gradually expands, and its length in the axial direction becomes shorter. The outer rubber tube 10 and its The structure connected below moves upward along the liquid filling channel base 11, and then cuts off the shear pin 29 for the anti-premature sealing fitting between the first anti-premature sealing mechanism and the second anti-premature sealing mechanism, thereby realizing axial displacement compensation toward the upper end of the outer rubber tube 10; when the outer rubber tube 10 expands and seals, the pressurization continues, the outer rubber tube 10 is axially stretched and lengthened, and the outer rubber tube 10 and the structure connected below it move downward along the liquid filling channel base 11 until the outer rubber tube 10 completely seals the casing; because the second clamping piece 262 can abut against the block 28, when it moves downward and contacts the block 28, the block 28 limits the axial movement, and the outer rubber tube 10 no longer extends along its axial direction, and then the liquid inlet one-way valve 2 returns to its position, and the pressure is trapped inside the through-tubing packer to achieve sealing. The through-tubing packer of the present invention completes the sealing as shown in the figure. Fig.19 shown.

[0142] 2. Balance valve open:

[0143] like Fig.17 As shown, the sliding unsealing cover is destroyed by the shear pin 24 by inserting a special tool, and the sliding unsealing cover 7 slides downward. The pressure at the lower part of the outer rubber tube 10 passes through the inside of the central tube 8 and enters the upper part of the outer rubber tube 10 through the balance hole 19, achieving upper and lower pressure balance, and preparing for the unsealing of the through-tubing packer.

[0144] 3. Unsealing the through-tubing packer:

[0145] like Fig.18As shown, the salvage joint 1 is lifted, and the shear pin 23 for lifting the piston is cut off. The internal pressure of the outer rubber tube 10 will enter the cavity of the liquid inlet channel base 6 through the annular inner cavity 20, and then enter the internal space of the liquid inlet cavity connecting the shell 4 through the second liquid inlet hole 18, and enter the salvage joint 1 through the side hole 22 on the lifting piston 5, and be discharged from the first liquid inlet hole 17 (this time it is a pressure relief hole) at the lower part of the salvage joint 1, and the packer is unsealed.

[0146] Figure 16-18 In the figure, “↓” indicates the hydraulic direction, and “×” indicates the shear pin shears off. For the direction of movement.

[0147] The present invention achieves a large-area sealing casing by pressurizing the inner surface of the outer rubber tube 10 to cause it to expand and dilate the sealing casing, thereby improving the sealing performance. The present invention seals through the outer rubber tube 10 to solve the problem of insufficient sealing performance and resulting in sealing failure when the existing through-the-oil pipe packer is used to seal special wells such as gas storage reservoirs, injection and production wells, and energy storage wells.

[0148] The material of the outer rubber tube 10 of the present invention is preferably a high-strength elastic material, such as hydrogenated nitrile rubber, whose elongation after fracture can reach about 600%. When the through-the-tubing packer begins to be unsealed, the pressure inside the outer rubber tube 10 is released through the pressure relief hole by lifting the salvage joint 1, and the outer rubber tube 10 can be retracted without obstacles, thereby realizing the smooth unsealing of the through-the-tubing packer, effectively solving the problem that the laminated steel sheets of the existing through-the-tubing packer cannot be retracted, resulting in the packer being pulled up and scratching the inner wall of the production tubing.

[0149] Furthermore, reinforcing material-fiber 30 is added to the high-strength elastic material, and the fiber 30 is arranged along the axis of the outer rubber tube 10. The fiber 30 at both ends of the outer rubber tube 10 has a higher density than the fiber 30 in the middle. The tensile strength value of the area with high fiber 30 density is improved. The two ends of the outer rubber tube 10 are densely covered with fibers 30, which enhances the strength of the outer rubber tube 10 and prevents the outer rubber tube 10 from continuously deforming after high-pressure expansion, and finally causes the high-strength elastic material to roll to both sides along the annular space, and finally may cause the problem of pressure explosion. In addition, the fiber 30 arranged along the axis has little effect on radial expansion, can significantly control the axial tensile capacity, and make the axial elongation of the outer rubber tube 10 controllable.

[0150] When the through-tubing packer of the present invention is set, since the stopper 28 closes one end of the annular inner cavity 20, the pressure in the annular inner cavity 20 acts on the inner surface of the outer rubber tube 10 through the pressure transmission hole 21, causing the outer rubber tube 10 to expand outward. When the outer rubber tube 10 expands, axial movement will occur. During the process of pressurizing and expanding the outer rubber tube 10, when the pressure is initially applied, the middle of the outer rubber tube 10 gradually expands, and its length in the axial direction becomes shorter. The outer rubber tube 10 and the structure connected thereto move upward along the liquid filling channel base 11; when the outer rubber tube 10 is expanded and set, the pressure is continued, and the outer rubber tube 10 is stretched and lengthened in the axial direction. Since the second clamping member 262 can abut against the stopper 28, when it moves downward and contacts the stopper 28, the stopper 28 limits the axial movement, and the outer rubber tube 10 no longer extends in its axial direction.

[0151] Since the lower end of the outer rubber tube 10 can drive the axial sliding member 13 and the anti-premature setting fitting to move axially upward along the axial direction of the liquid filling channel base 11 through the lower protective hoop joint 12 when the initial pressurization is applied, when the outer rubber tube 10 is expanded and set and pressurized continuously, the lower end can move axially downward and abut against the stopper 28. Therefore, the present invention also has the following advantages:

[0152] 1. Enhanced axial stability: The outer rubber tube 10 can generate axial movement during the expansion process and contact with the stopper 28 for limiting, thus avoiding excessive elongation. This can improve the stability of the overall structure of the through-tubing packer and prevent unexpected failure under complex working conditions.

[0153] 2. Adaptive deformation: The outer rubber tube 10 can expand and contract adaptively according to the changes in the inner cavity pressure, which improves the flexibility and adaptability of the equipment under different working conditions.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A through-tubing packer, characterized in that: It includes a salvage joint, a liquid inlet one-way valve, an elastic telescopic part, a liquid inlet inner cavity connecting shell, a lifting piston, a liquid inlet channel base, a liquid filling channel base, a central tube and an outer rubber cylinder; The liquid inlet check valve and the elastic telescopic member are installed inside the salvage joint, the upper part of the liquid inlet check valve abuts against the inner wall surface of the salvage joint, the lower part of the salvage joint is connected to the lifting piston, one end of the elastic telescopic member abuts against the liquid inlet check valve, and the other end of the elastic telescopic member abuts against the lifting piston; The liquid inlet inner cavity connecting shell is sleeved on the lower part of the salvage joint and connected to the upper part of the liquid inlet channel base; a first liquid inlet hole is opened on the salvage joint, and the first liquid inlet hole connects the lower part of the salvage joint with the liquid inlet inner cavity connecting shell; The upper end of the outer rubber tube is connected to the lower end of the liquid inlet channel base, and the lower end of the outer rubber tube is connected to the lower structure of the through-tubing packer; The outer rubber sleeve is sleeved on the outside of the liquid filling channel base, a central tube is arranged inside the liquid filling channel base, one end of the central tube is connected to the liquid inlet channel base, an annular inner cavity is formed between the central tube and the liquid filling channel base, a second liquid inlet hole is opened on the liquid inlet channel base, and the second liquid inlet hole connects the liquid inlet inner cavity connection shell with the annular inner cavity; The lower end of the liquid filling channel base is connected with a stopper, the stopper closes one end of the annular inner cavity, and the lower end of the outer rubber tube can abut against the stopper; A pressure transmission hole is provided on the side wall of the liquid filling channel base, and the pressure transmission hole is communicated with the annular inner cavity.

2. The through-tubing packer according to claim 1, characterized in that: The outer rubber tube is made of high-strength elastic material.

3. The through-tubing packer according to claim 2, characterized in that: Fibers are added into the high-strength elastic material, and the fibers are arranged along the axis of the outer rubber tube. The fibers at both ends of the outer rubber tube have a higher density than the fibers in the middle thereof.

4. The through-tubing packer according to claim 1, characterized in that: A balancing hole is provided on the base of the liquid inlet channel, the balancing hole is connected to one end of the central tube, and the other end of the central tube is connected to the outside; A sliding unsealing cover is installed on the liquid inlet channel base, the sliding unsealing cover seals the balance hole, and the sliding unsealing cover is connected to the liquid inlet channel base through a first shearing mechanism.

5. The through-tubing packer according to claim 1, characterized in that: The lower part of the lifting piston extends into the upper part of the liquid inlet channel base, and a second shearing mechanism is installed between the liquid inlet channel base and the lifting piston.

6. The through-tubing packer according to claim 1, characterized in that: The upper end of the outer rubber tube is connected to the lower end of the liquid inlet channel base through an upper protective hoop joint, and the outer rubber tube is fixedly connected to the upper protective hoop joint; The lower end of the outer rubber tube is connected to the lower structure of the through-tubing packer through a lower protective hoop joint, and the outer rubber tube is fixedly connected to the lower protective hoop joint.

7. The through-tubing packer according to claim 6, characterized in that: A first clamping piece is connected between the upper guard hoop joint and the liquid filling channel base, a second clamping piece is installed between the lower guard hoop joint and the liquid filling channel base, the second clamping piece is connected to the lower guard hoop joint, axial displacement can occur between the second clamping piece and the liquid filling channel base, and the outer rubber tube abuts against the stopper through the second clamping piece.

8. The through-tubing packer according to claim 7, characterized in that: The two ends of the outer rubber cylinder are respectively connected with a first clamping ring and a second clamping ring, the first clamping ring abuts against the first clamping piece, and the second clamping ring abuts against the second clamping piece.

9. The through-tubing packer according to claim 6, characterized in that: The liquid inlet channel base is connected to the upper protective hoop joint through a connecting piece.

10. The through-tubing packer according to any one of claims 6 to 9, characterized in that: The lower structure of the through-tubing packer includes an axial sliding member and an anti-premature setting matching member; The axial sliding member is connected to the lower protective hoop joint, and the anti-early setting fitting member includes a first anti-early setting fitting member and a second anti-early setting fitting member, the first anti-early setting fitting member is connected to the axial sliding member, the second anti-early setting fitting member is sleeved on the outside of the center pipe and abuts against the lower end of the limiting step on the outer surface of the center pipe, and the first anti-early setting fitting member and the second anti-early setting fitting member are connected by a third shearing mechanism; The lower end of the central tube is connected with a guide shoe.

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