Metal packer

Abstract

The invention relates to the technical field of oil and gas reservoir exploitation equipment, in particular to a metal packer which is used for solving the problem that a traditional packer cannot meet the construction requirement of a high-temperature and high-pressure well easily and comprises an upper connector used for being connected with an oil and gas pipe and further comprises a central pipe. The supporting seat is in threaded connection with the central pipe; the upper cone is in threaded connection with the supporting seat; the upper sealing body is sleeved on the supporting seat; the lower sealing body is slidably connected to the upper sealing body; the upper sealing body, the lower sealing body and the upper cone are all made of metal materials; after the upper sealing body and the lower sealing body synchronously move upwards, the upper sealing body and the lower sealing body extrude the upper cone correspondingly, and then the upper sealing body, the lower sealing body and the upper cone are attached, so that connection between the oil gas pipes is sealed through metal, and the upper sealing body, the lower sealing body and the upper cone are all made of metal materials. Therefore, the construction requirements of high-temperature and high-pressure wells are met.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas reservoir production equipment, and particularly to a metal packer. Background Art

[0002] When multi-layer fracturing and acidizing operations are carried out in oil and gas wells, packers are often used as interlayer isolation tools to avoid interlayer interference. As a key tool for interlayer isolation, the sealing effect of the packer will directly determine the success or failure of the construction.

[0003] With the continuous deepening of oil and gas well exploration and development, the depth of oil and gas wells is increasing continuously, resulting in the continuous increase of the temperature and pressure of the construction horizons. However, the traditional packer structure with a steel body and a rubber sealing mechanism is not easy to meet the construction requirements of high-temperature and high-pressure wells. Summary of the Invention

[0004] The present invention provides a metal packer to solve the problem that the traditional packer is not easy to meet the construction requirements of high-temperature and high-pressure wells.

[0005] In order to alleviate the above technical problems, the technical solution provided by the present invention is as follows:

[0006] A metal packer, comprising an upper joint for connecting an oil and gas pipe, and further comprising: a central pipe; a support seat threadedly connected to the central pipe; an upper cone threadedly connected to the support seat; an upper seal body sleeved on the support seat; a lower seal body slidably connected to the upper seal body; the upper seal body, the lower seal body and the upper cone are all made of metal materials; after the upper seal body and the lower seal body move upward synchronously, the upper seal body and the lower seal body respectively press against the upper cone, and then the upper seal body, the lower seal body and the upper cone fit together to form a seal.

[0007] Furthermore, a convex block is provided on the lower seal body, a groove engaged with the convex block is formed in the upper seal body, and the convex block can slide in the groove.

[0008] Furthermore, a collar is threadedly connected to the lower part of the central pipe where the lower seal body is located; a locking sleeve is sleeved on the central pipe, and the inner wall of the locking sleeve fits against the outer wall of the collar; a fourth shear pin is connected between the locking sleeve and the central pipe; a slip seat is sleeved on the central pipe and threadedly connected to the upper part of the locking sleeve; the lower seal body is connected to the upper part of the slip seat; a closed space is formed in the locking sleeve between the collar and the slip seat, and a pressure transmission hole communicating with the closed space is formed in the side wall of the central pipe; when the central pipe is pressurized internally, the pressure is conducted to the closed space through the pressure transmission hole and pushes the slip seat upward to break the fourth shear pin, so that the locking sleeve drives the slip seat and the lower seal body to move upward.

[0009] Further, a lower cone is connected to the lower part of the lower seal body, and the lower cone is sleeved on the central tube; a slip body is sleeved on the lower part of the lower cone, and the slip seat is sleeved on the lower part of the slip body; a second shear pin is connected between the slip body and the lower cone; after the upper seal body and the lower seal body are lifted to form a seal, the locking sleeve continues to drive the slip seat to move upward, causing the second shear pin to break, so that the slip body moves upward relative to the lower cone and is expanded by the extrusion of the lower cone, so as to support the upper seal body and the lower seal body.

[0010] Further, a spring is connected between the slip body and the slip seat.

[0011] Further, a locking ring is sleeved on the collar, and barbed threads are provided on the outer wall of the locking ring, and the barbed threads are in contact with the inner wall of the locking sleeve.

[0012] Further, a positioning sleeve is sleeved on the collar, and the positioning sleeve is located below the locking ring; a third shear pin is connected between the positioning sleeve and the collar; when the central tube moves upward relative to the locking sleeve and the third shear pin breaks, the locking ring and the positioning sleeve can be disengaged from the collar.

[0013] Further, a groove is provided on the slip seat and a C-ring is installed in the groove; a card slot matching with the C-ring is provided on the outer wall of the central tube; when the C-ring contacts the outer wall of the central tube, the C-ring elastically expands; when the C-ring is in the card slot on the outer wall of the central tube, the C-ring elastically contracts and is clamped in the card slot on the outer wall of the central tube, so that the positions of the slip seat and the central tube are relatively fixed.

[0014] Further, a first shear pin is connected between the upper seal body and the support seat; the first shear pin breaks when the upper seal body and the lower seal body move upward synchronously.

[0015] Further, the fourth shear pin breaks before the first shear pin, the first shear pin breaks before the second shear pin, and the second shear pin breaks before the third shear pin.

[0016] The beneficial effects of the present invention are analyzed as follows:

[0017] A metal packer includes an upper joint for connecting an oil and gas pipe, and further includes: a central tube;

[0018] A support seat, threadedly connected to the central tube;

[0019] An upper cone, threadedly connected to the support seat;

[0020] An upper sealing body, sleeved on the support seat;

[0021] A lower sealing body, slidably connected to the upper sealing body;

[0022] The upper sealing body, the lower sealing body and the upper cone are all made of metal;

[0023] After the upper sealing body and the lower sealing body move upward synchronously, the upper sealing body and the lower sealing body are respectively pressed against the upper cone, and then the upper sealing body, the lower sealing body and the upper cone are fitted together to form a seal.

[0024] When in use, the oil and gas pipes are connected to the packer through the upper joint and the center pipe, and the metal sealing ring provides sealing for the connection between the upper joint and the support seat. The oil and gas pipes and the packer are lowered into the oil and gas well, and the lower sealing body is clamped with the upper sealing body. When the lower sealing body moves up, the upper sealing body is driven to move up synchronously. The upper sealing body and the lower sealing body are both composed of two symmetrically arranged quarter-cone cylinders. After the lower sealing body and the upper sealing body move up, the upper sealing body and the lower sealing body are squeezed and fitted with the upper cone, and the two quarter-cone cylinders constituting the lower sealing body move between the two quarter-cone cylinders constituting the upper sealing body, so that the upper sealing body and the lower sealing body are tightly fitted, so that the connection between the oil and gas pipes is metal-sealed, and the upper sealing body, the lower sealing body and the upper cone are all made of metal materials, thereby meeting the construction requirements of high-temperature and high-pressure wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the related technologies, the drawings required for use in the specific embodiments or the related technical descriptions will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure after setting of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure after unsealing of the present invention.

[0029] icon:

[0030] 100, Central tube; 110, Upper joint; 111, Metal sealing ring; 120, Support seat; 130, Upper cone; 140, Upper sealing body; 150, Lower sealing body; 160, First shear pin; 200, Locking sleeve; 210, Ring sleeve; 211, Locking ring; 212, Positioning sleeve; 213, Third shear pin; 220, Fourth shear pin; 230, Slip seat; 231, C-ring; 240, Sealed space; 250, Pressure transmission hole; 300, Lower cone; 310, Slip body; 320, Second shear pin; 330, Spring. Detailed implementation manners

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "central", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0034] Embodiment

[0035] As Figures 1 - 3As shown in the figure, a metal packer includes an upper joint 110 for connecting oil and gas pipelines, and further includes: a central pipe 100; a support seat 120 threadedly connected to the central pipe 100; an upper cone 130 threadedly connected to the support seat 120; an upper seal 140 sleeved on the support seat 120; a lower seal 150 slidably connected to the upper seal 140; the upper seal 140, the lower seal 150 and the upper cone 130 are all made of metal; after the upper seal 140 and the lower seal 150 move upward synchronously, the upper seal 140 and the lower seal 150 are respectively pressed against the upper cone 130, and then the upper seal 140, the lower seal 150 and the upper cone 130 are fitted together to form a seal.

[0036] The working mechanism of the metal packer provided in this embodiment:

[0037] When in use, the oil and gas pipeline is connected to the packer through the upper joint 110 and the central pipe 100. The metal sealing ring 111 provides a seal for the connection between the upper joint 110 and the support seat 120. The oil and gas pipeline and the packer are lowered into the oil and gas well. The lower seal 150 is clamped with the upper seal 140. When the lower seal 150 moves upward, it drives the upper seal 140 to move upward synchronously. The upper seal 140 and the lower seal 150 are both composed of two symmetrically arranged quarter cone cylinders. After the lower seal 150 and the upper seal 140 move upward, the upper seal 140 and the lower seal 150 are pressed and fitted with the upper cone 130. The two quarter cone cylinders forming the lower seal 150 move between the two quarter cone cylinders forming the upper seal 140, so that the upper seal 140 and the lower seal 150 are closely fitted, so that the connection between the oil and gas pipelines is hermetically sealed by metal. Moreover, the upper seal 140, the lower seal 150 and the upper cone 130 are all made of metal, so as to meet the construction requirements of high-temperature and high-pressure wells.

[0038] Regarding how the lower seal 150 is connected to the upper seal 140, specifically:

[0039] The lower seal 150 is provided with a convex block, and the upper seal 140 is provided with a groove that engages with the convex block, and the convex block can slide in the groove.

[0040] The convex block is arranged inside the lower seal 150, and the groove is opened inside the upper seal 140. When the upper seal 140 does not contact the upper cone 130, the lower seal 150 can drive the upper seal 140 to move upward synchronously. When the upper seal 140 abuts against the upper cone 130, if the lower seal 150 continues to move upward, the convex block slides in the groove, so that the lower seal 150 and the upper seal 140 slide relative to each other. When the lower seal 150 slides to abut against the upper cone 130, the upper seal 140 and the lower seal 150 jointly form a sealed cone cylinder.

[0041] Regarding how the lower seal body 150 and the upper seal body 140 move upward, specifically:

[0042] A collar 210 is threadedly connected to the lower part of the lower seal body 150 on the central pipe 100; a locking sleeve 200 is sleeved on the central pipe 100, and the inner wall of the locking sleeve 200 fits against the outer wall of the collar 210; a fourth shear pin 220 is connected between the locking sleeve 200 and the central pipe 100; a slip seat 230 is sleeved on the central pipe 100, and the slip seat 230 is threadedly connected to the upper part of the locking sleeve 200; the lower seal body 150 is connected to the upper part of the slip seat 230; there is a sealed space 240 in the locking sleeve 200 between the collar 210 and the slip seat 230, and a pressure transmission hole 250 communicating with the sealed space 240 is provided on the side wall of the central pipe 100; when the central pipe 100 is pressurized internally, the pressure is conducted to the sealed space 240 through the pressure transmission hole 250 and pushes the slip seat 230 to move upward, causing the fourth shear pin 220 to break, so that the locking sleeve 200 drives the slip seat 230 and the lower seal body 150 to move upward.

[0043] The pressure applied inside the tubing is conducted to the sealed space 240 through the pressure transmission hole 250, increasing the pressure inside the sealed space 240. This pressure is transmitted to the slip seat 230, causing the slip seat 230 to drive the locking sleeve 200 to have an upward movement tendency under the action of the pressure. When the pressure acting on the slip seat 230 is greater than the shear pressure of the fourth shear pin 220, the fourth shear pin 220 is cut off, and the slip seat 230 and the locking sleeve 200 move upward together. During the upward movement of the slip seat 230, it pushes the upper seal body 140 and the lower seal body 150 to move upward together, and the upper seal body 140 and the lower seal body 150 fit together to form a metal seal with the upper cone 130.

[0044] Regarding how the upper seal body 140 and the lower seal body 150 are supported, specifically:

[0045] The lower part of the lower seal body 150 is connected to a lower cone 300, and the lower cone 300 is sleeved on the central pipe 100; a slip body 310 is sleeved on the lower part of the lower cone 300, and the slip seat 230 is sleeved on the lower part of the slip body 310; a second shear pin 320 is connected between the slip body 310 and the lower cone 300; after the upper seal body 140 and the lower seal body 150 move upward to form a seal, the locking sleeve 200 continues to drive the slip seat 230 to move upward, causing the second shear pin 320 to break, so that the slip body 310 moves upward relative to the lower cone 300 and expands under the extrusion of the lower cone 300, so as to support the upper seal body 140 and the lower seal body 150.

[0046] The lower seal body 150 is connected to the lower cone 300 by connecting pins. After the lower seal body 150 and the upper seal body 140 run to the uppermost part and contact the inclined surface in the upper cone 130, when the pressure continues to push the slip seat 230 upward, the second shear pin 320 is cut off, and the slip body 310 expands and hangs on the casing to form a support for the packer. At the same time, during the upward movement of the locking sleeve 200 together with the slip seat 230, the locking ring 211 is locked to the locking sleeve 200 to complete the setting of the packer.

[0047] Regarding the connection method between the slip seat 230 and the slip body 310, specifically:

[0048] A spring 330 is connected between the slip body 310 and the slip seat 230.

[0049] Both ends of the spring 330 are respectively connected to the slip body 310 and the slip seat 230 to ensure the relative position between the slip body 310 and the slip seat 230 is fixed.

[0050] Regarding how to ensure that the lower seal body 150 and the upper seal body 140 are in close contact with the upper cone 130, specifically:

[0051] A locking ring 211 is sleeved on the collar 210, and barbed threads are provided on the outer wall of the locking ring 211, and the barbed threads abut against the inner wall of the locking sleeve 200.

[0052] The setting of the barbed threads enables the locking sleeve 200 to only move upward relative to the central pipe 100, thereby ensuring the firmness of the close contact between the lower seal body 150 and the upper seal body 140 and the upper cone 130.

[0053] Regarding how to release the metal packer, specifically:

[0054] A positioning sleeve 212 is sleeved on the collar 210, and the positioning sleeve 212 is located below the locking ring 211; a third shear pin 213 is connected between the positioning sleeve 212 and the collar 210; when the central pipe 100 moves upward relative to the locking sleeve 200 and the third shear pin 213 is disconnected, the locking ring 211 and the positioning sleeve 212 can be separated from the collar 210.

[0055] After the construction is completed and the packer needs to be released, by lifting the tubing, the tubing drives the upper joint 110, the upper cone 130, the support seat 120, the collar 210, and the central pipe 100 to move upward. During the movement, when the lifting force reaches the shearing pressure of the third shear pin 213, the third shear pin 213 is cut off. At this time, the locking ring 211 and the positioning sleeve 212 are separated from the collar 210, and the upper seal body 140, the lower seal body 150, and the slip body 310 lose the locking support of the locking ring 211 and the locking sleeve 200 and are in a relatively free state. However, at this time, the slip body 310 is still hanging in the casing, and there is a certain biting force between the slip body 310 and the casing.

[0056] Regarding how to separate the lower seal body 150 from the upper cone 130 when unsealing the metal packer, specifically:

[0057] The slip seat 230 is provided with a groove and a C-ring 231 is installed in the groove; a card slot matching with the C-ring 231 is provided on the outer wall of the central tube 100; when the C-ring 231 contacts the outer wall of the central tube 100, the C-ring 231 elastically expands; when the C-ring 231 is in the card slot on the outer wall of the central tube 100, the C-ring 231 elastically contracts and is clamped in the card slot on the outer wall of the central tube 100, so that the positions of the slip seat 230 and the central tube 100 are relatively fixed.

[0058] The tubing drives the upper joint 110, the upper cone 130, the support seat 120, the ring sleeve 210, and the central tube 100 to continue moving upward. During the movement, when the C-ring 231 moves to the groove of the central tube 100, the C-ring 231 returns to its original state and locks onto the central tube 100. At this time, the upper seal body 140, the lower seal body 150, and the slip body 310 return to their original states under the combined stretching action of the upper support seat 120 and the lower C-ring 231, realizing unsealing.

[0059] Regarding the connection method between the upper seal body 140 and the support seat 120, specifically:

[0060] A first shear pin 160 is connected between the upper seal body 140 and the support seat 120; the first shear pin 160 breaks when the upper seal body 140 and the lower seal body 150 move upward synchronously.

[0061] The slip seat 230 and the locking sleeve 200 move upward together. During the upward movement of the slip seat 230, it pushes the upper seal body 140 and the lower seal body 150 to move upward together, and the first shear pin 160 is cut during the movement.

[0062] In an alternative embodiment of the present example, preferably:

[0063] The fourth shear pin 220 breaks before the first shear pin 160, the first shear pin 160 breaks before the second shear pin 320, and the second shear pin 320 breaks before the third shear pin 213.

[0064] The pressure inside the central pipe 100 is transmitted to the sealed space 240 through the pressure transmission holes 250. The pressure inside the sealed space 240 increases. At this time, the pressure inside the sealed space 240 first acts on the fourth shear pin 220, causing the fourth shear pin 220 to break first. At this time, the locking sleeve 200 pushes the lower seal body 150 and the upper seal body 140. At this time, the first shear pin 160 breaks, and the lower seal body 150 and the upper seal body 140 can move upward. When the lower seal body 150 and the upper seal body 140 are respectively in contact with the upper cone 130, the lower seal body 150 and the upper seal body 140 no longer move relative to the upper cone 130. At this time, the pressure inside the sealed space 240 continues to increase, pushing the slip body 310 to have a tendency to move upward relative to the lower cone 300, so that the second shear pin 320 breaks, and then the setting of the metal packer is completed; when releasing the metal packer, lift the oil and gas pipe connected to the upper joint 110. This pulling force acts on the locking sleeve 200. Thus, the upward moving force of the locking sleeve 200 acts on the positioning sleeve 212, causing the third shear pin 213 to break, so that the metal packer can be released.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A metal packer, comprising an upper joint (110) for connecting an oil and gas pipe, characterized in that ； it further comprises: a central pipe (100); a support seat (120) threadedly connected to the central pipe (100); an upper cone (130) threadedly connected to the support seat (120); an upper seal body (140) sleeved on the support seat (120); a lower seal body (150) slidably connected to the upper seal body (140); the upper seal body (140), the lower seal body (150) and the upper cone (130) are all made of metal materials; after the upper seal body (140) and the lower seal body (150) move upward synchronously, the upper seal body (140) and the lower seal body (150) respectively press against the upper cone (130), and then the upper seal body (140), the lower seal body (150) and the upper cone (130) fit together to form a seal.

2. The metal packer according to claim 1, characterized in that ； a convex block is provided on the lower seal body (150), a groove engaging with the convex block is formed in the upper seal body (140), and the convex block can slide in the groove.

3. The metal packer according to claim 1, characterized in that; a collar (210) is threadedly connected to the lower part of the central pipe (100) where the lower seal body (150) is located; a locking sleeve (200) is sleeved on the central pipe (100), and the inner wall of the locking sleeve (200) fits against the outer wall of the collar (210); a fourth shear pin (220) is connected between the locking sleeve (200) and the central pipe (100); a slip seat (230) is sleeved on the central pipe (100), and the slip seat (230) is threadedly connected to the upper part of the locking sleeve (200); the lower seal body (150) is connected to the upper part of the slip seat (230); a sealed space (240) is formed in the locking sleeve (200) between the collar (210) and the slip seat (230), and a pressure transmission hole (250) communicating with the sealed space (240) is formed in the side wall of the central pipe (100); when the inside of the central pipe (100) is pressurized, the pressure is conducted to the sealed space (240) through the pressure transmission hole (250) and pushes the slip seat (230) to move upward, causing the fourth shear pin (220) to break, so that the locking sleeve (200) drives the slip seat (230) and the lower seal body (150) to move upward.

4. The metal packer according to claim 3, characterized in that; a lower cone (300) is connected to the lower part of the lower seal body (150), and the lower cone (300) is sleeved on the central pipe (100); a slip body (310) is sleeved on the lower part of the lower cone (300), and the slip seat (230) is sleeved on the lower part of the slip body (310); a second shear pin (320) is connected between the slip body (310) and the lower cone (300); After the upper seal body (140) and the lower seal body (150) move upward to form a seal, the locking sleeve (200) continues to drive the slip seat (230) upward, causing the second shear pin (320) to break, so that the slip body (310) moves upward relative to the lower cone (300) and is expanded by the extrusion of the lower cone (300), so that the upper seal body (140) and the lower seal body (150) are supported.

5. The metal packer according to claim 4, characterized in that; A spring (330) is connected between the slip body (310) and the slip seat (230).

6. The metal packer according to claim 3 ， characterized in that; A locking ring (211) is sleeved on the collar (210), and barbed threads are provided on the outer wall of the locking ring (211), and the barbed threads are in contact with the inner wall of the locking sleeve (200).

7. The metal packer according to claim 6 ， characterized in that; A positioning sleeve (212) is sleeved on the collar (210), and the positioning sleeve (212) is located below the locking ring (211); A third shear pin (213) is connected between the positioning sleeve (212) and the collar (210); When the central tube (100) moves upward relative to the locking sleeve (200) and the third shear pin (213) breaks, the locking ring (211) and the positioning sleeve (212) can be disengaged from the collar (210).

8. The metal packer according to claim 7, characterized in that; A groove is provided on the slip seat (230), and a C-ring (231) is installed in the groove; A card slot cooperating with the C-ring (231) is provided on the outer wall of the central tube (100); When the C-ring (231) contacts the outer wall of the central tube (100), the C-ring (231) elastically expands; When the C-ring (231) is in the card slot on the outer wall of the central tube (100), the C-ring (231) elastically contracts and is clamped in the card slot on the outer wall of the central tube (100), so that the positions of the slip seat (230) and the central tube (100) are relatively fixed.

9. The metal packer according to claim 1, characterized in that ； A first shear pin (160) is connected between the upper seal body (140) and the support seat (120); The first shear pin (160) breaks when the upper seal body (140) and the lower seal body (150) move upward synchronously.

10. The metal packer according to claim 4, 7 or 9 ， characterized in that; The fourth shear pin (220) breaks before the first shear pin (160), the first shear pin (160) breaks before the second shear pin (320), and the second shear pin (320) breaks before the third shear pin (213).

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