Suspension sealing device for underwater oil and gas production

Abstract

The utility model discloses a suspension sealing device for underwater oil and gas production, which belongs to the field of oil and gas exploration and comprises a central tube, the upper end and the lower end of the central tube are respectively screwed with an upper joint and a positioning barrel, and the central tube is sequentially sleeved with a sliding sleeve, a rubber barrel, an upper sliding seat, a slip, a lower sliding seat and a lower joint; the upper and lower ends of the slips are respectively matched with the upper sliding seat and the lower sliding seat through inclined surfaces or conical surfaces; a limiting ring groove is formed in the inner wall of the lower joint; a limiting protruding block matched with the limiting ring groove is arranged on the outer wall of the positioning cylinder, and a plurality of positioning holes are evenly formed in the inner wall of the positioning cylinder in the circumferential direction. The suspension sealing device provided by the utility model is provided with the positioning cylinder, so that the complexity of a self recovery structure is simplified, the structural complexity of a recovery tool is also simplified, and the sealing and fixing of the suspension sealing device relative to an oil well can be relieved only by placing the recovery tool in place and rotating during recovery; and the suspension sealing device can be conveniently withdrawn.

Description

Technical Field

[0001] The utility model relates to the field of oil and gas exploration, in particular to a suspension sealing device for underwater oil and gas production. Background Art

[0002] During oilfield exploration and development, especially during oil testing, downhole operations, oil and gas layer transformation, formation testing, injection and production layer adjustment and other construction processes, downhole plugging tools are often needed to temporarily or permanently plug the oil, gas and water layers.

[0003] The suspended sealing device is a plugging tool used for sealing oil wells. During the plugging construction, it is lowered to a predetermined position underground, and then the seal is controlled from the ground to achieve the plugging of the target layer.

[0004] The Chinese invention patent with publication number CN105114021A not only discloses a suspension sealer for sealing, but also discloses a feeding tool and a recovery tool used when disassembling and assembling the suspension sealer. Although this invention patent solves the problem that the existing suspension sealer is inconvenient to disassemble and assemble and cannot be recovered, it also has the disadvantages of complex equipment structure and high manufacturing and maintenance costs. Utility Model Content

[0005] In view of the problem of complex structure of the suspension sealing device in the prior art, the purpose of the utility model is to provide a suspension sealing device for underwater oil and gas production, so as to at least partially solve the above problem.

[0006] To achieve the above purpose, the technical solution of the utility model is:

[0007] A suspension sealing device for underwater oil and gas production, comprising:

[0008] Central tube;

[0009] An upper joint, wherein the inner wall of the lower end of the upper joint is threadedly connected to the outer wall of the upper end of the central tube, and a stop step is provided on the inner wall of the upper end of the upper joint;

[0010] A sliding sleeve, wherein the sliding sleeve is movably sleeved on the outer side of the upper joint, and the lower end of the sliding sleeve is connected to the central pipe via a shear pin;

[0011] A rubber cylinder, the rubber cylinder is sleeved on the central tube and is located below the sliding sleeve;

[0012] An upper slide seat, the upper slide seat is movably sleeved on the central tube, and the upper slide seat is located below the rubber cylinder;

[0013] Slips, the slips are sleeved on the central tube, and the inner wall of the upper end of the slips is matched with the inner wall of the lower end of the upper slide seat through an inclined surface or a conical surface;

[0014] A lower sliding seat, wherein the lower sliding seat is movably sleeved on the central tube, and an upper inner wall of the lower sliding seat is matched with a lower inner wall of the slip through an inclined surface or a conical surface;

[0015] A lower joint, which is movably and sealingly sleeved on the outer side of the lower end of the central tube, and a limiting annular groove is provided on the inner wall of the lower end of the lower joint;

[0016] A positioning cylinder, wherein the inner wall of the upper end of the positioning cylinder is threadedly connected to the outer wall of the lower end of the central tube, the outer wall of the lower end of the positioning cylinder is provided with a limiting protrusion matched with the limiting ring groove, and a plurality of positioning holes are evenly arranged on the inner wall of the lower end of the positioning cylinder.

[0017] In some embodiments, the slips and the upper slide seat, and the slips and the lower slide seat are connected by shear pins.

[0018] In some embodiments, there are multiple rubber cylinders which are sequentially sleeved on the central tube, and an annular partition is provided between two adjacent rubber cylinders.

[0019] In some embodiments, the suspension sealing device also includes a matching recovery tool, which includes a recovery rod, a disc-shaped body is fixed to the lower end of the recovery rod, and a plurality of positioning rods are evenly and movably inserted circumferentially on the circumferential side wall of the disc-shaped body. The positioning rods are adapted to the positioning holes, and a spring is arranged between the positioning rod and the disc-shaped body, and the spring is used to provide an elastic force to keep the positioning rod away from the disc-shaped body.

[0020] In some embodiments, the lower edge of the inner wall of the central tube is tapered with the larger end facing downward, so that the positioning rod can be forced to retract when the retrieval tool is retracted.

[0021] In some embodiments, a sealing groove is provided on the inner wall of the upper end of the lower joint, and a sealing ring is installed in the sealing groove.

[0022] In some embodiments, a rack is provided on the outer wall of the central tube, and a ratchet matched with the rack is provided on the inner wall of the sliding sleeve to prevent the sliding sleeve from moving upward.

[0023] By adopting the above technical scheme, the beneficial effect of the utility model is that the suspension sealing device provided by the utility model patent simplifies the complexity of its own recovery structure by setting a positioning cylinder, thereby also simplifying the structural complexity of the recovery tool. During recovery, it is only necessary to lower the recovery tool into place and rotate it to release the seal and fixation of the suspension sealing device relative to the oil well, thereby facilitating the retraction of the suspension sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0026] Figure 3 It is a schematic diagram of the structure of the recovery tool;

[0027] Figure 4 This is a bottom view of the recovery tool.

[0028] In the figure: 1-center tube, 2-upper joint, 21-stop step, 3-sleeve, 31-pawl, 32-lifting rod, 33-connecting rod, 4-shear pin, 5-rubber cylinder, 6-upper slide seat, 7-slip, 8-lower slide seat, 9-lower joint, 10-positioning cylinder, 101-limiting protrusion, 102-positioning hole, 11-rack, 12-recovery rod, 13-disc body, 14-positioning rod, 15-spring, 16-stop column. DETAILED DESCRIPTION

[0029] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the description of the structure of the present invention as shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0031] The "first" and "second" in this technical solution are only used to distinguish the names of the same or similar structures, or corresponding structures with similar functions, and are not an arrangement of the importance of these structures, nor do they have a ranking, comparison of size, or other meanings.

[0032] In addition, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, the connection 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 a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the two structures. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood based on the overall idea of ​​the utility model and the specific context of the scheme.

[0033] Example

[0034] like Figure 1 As shown, an embodiment of the utility model provides a suspension sealing device for underwater oil and gas production, including a center pipe 1, an upper joint 2, a sliding sleeve 3, a rubber cylinder 5, an upper sliding seat 6, a slip 7, a lower sliding seat 8, a lower joint 9 and a positioning cylinder 10.

[0035] The center tube 1 is configured as a hollow tubular structure. The upper joint 2 is configured as a sleeve-shaped structure, the lower inner wall of the upper joint 2 is fixed to the upper outer wall of the center tube 1 by threaded connection, the upper end of the upper joint 2 protrudes from the center tube 1, and the upper inner wall of the upper joint 2 is provided with a stop step 21. During installation, the supporting delivery tool lowers the suspension sealing device provided by the embodiment of the utility model through the stop step 21. The specific structure of the delivery tool used here has been disclosed in the patent document mentioned in the background technology, and will not be repeated in this embodiment.

[0036] The sliding sleeve 3 is sleeved on the outer side of the upper joint 2, and the inner wall of the sliding sleeve 3 is in a clearance fit with the outer wall of the upper joint 2, so that the sliding sleeve 3 can move freely relative to the upper joint 2. In addition, the lower end of the sliding sleeve 3 protrudes from the lower end of the upper joint 2, and the lower end of the sliding sleeve 3 is in a retracted shape, and the inner wall of the lower end of the sliding sleeve 3 is in a clearance fit with the outer wall of the center tube 1, and the sliding sleeve 3 and the center tube 1 are also connected by a shear pin 4. During installation, after the feeding tool lowers the suspension seal device into place, it will apply a downward thrust to the sliding sleeve 3, and this thrust can push the sliding sleeve 3 to continue to move downward after cutting off the shear pin 4.

[0037] In this embodiment, Figure 2 As shown, a rack 11 is integrally formed on the outer wall of the central tube 1, and a pawl 31 used in conjunction with the rack 11 is provided on the inner wall of the lower end of the sleeve 3. The result of the use of the pawl 31 and the rack 11 is to allow the sleeve 3 to move downward and prevent the sleeve 3 from moving upward.

[0038] It is easy to understand that a radial through hole is also formed on the outer wall of the sleeve 3, and a lifting rod 32 is movably inserted into the radial through hole, and the lifting rod 32 is connected to the pawl 31 through a connecting rod 33. In this way, the pawl 31 can be driven away from the rack 11 by operating the lifting rod 32, so that the sleeve 3 can be reset to facilitate the reuse of the suspension sealing device.

[0039] The rubber cylinder 5 is sleeved on the outside of the central tube 1, and the rubber cylinder 5 is located below the sliding sleeve 3. Usually, there are multiple rubber cylinders 5 and they are sleeved on the central tube 1 in sequence. An annular partition is arranged between two adjacent rubber cylinders 5. The outer diameter of the annular partition is smaller than the outer diameter of the rubber cylinder 5 after extrusion deformation, so that the annular partition will not touch the well wall or pipe wall to be sealed.

[0040] The upper slide 6 is sleeved on the outside of the center tube 1, and the inner wall of the upper slide 6 is gap-matched with the outer wall of the center tube 1 so that the upper slide 6 can move freely axially relative to the center tube 1. The upper slide 6 is located below the rubber cylinder 5 and will move downward under the extrusion of the rubber cylinder 5.

[0041] The slip 7 is sleeved on the central tube 1 , and the slip 7 is located below the upper slide 6 , and the upper inner wall of the slip 7 is matched with the lower inner wall of the upper slide 6 through an inclined surface or a conical surface.

[0042] The lower lower seat 8 is sleeved on the outer side of the central tube 1, and the inner wall of the lower lower seat 8 is matched with the outer wall of the central tube 1 in a clearance, so that the lower lower seat 8 can freely move axially relative to the central tube 1, and the lower lower seat 8 is located below the slip 7. In addition, the upper inner wall of the lower lower seat 8 is matched with the lower inner wall of the slip 7 through an inclined surface or a conical surface.

[0043] In addition, the slip 7 and the upper slide seat 6, and the slip 7 and the lower slide seat 8 are connected by shear pins 4, so as to avoid misalignment when not in use, which may cause the slip 7 to burst.

[0044] The lower joint 9 is sleeved on the central tube 1, and the inner wall of the upper end of the lower joint 9 is gap-matched with the outer wall of the lower end of the central tube 1, so that the lower joint 9 can freely move axially relative to the central tube 1. In addition, a sealing groove is provided on the inner wall of the upper end of the lower joint 9, and a sealing ring is installed in the sealing groove to seal the gap between the lower joint 9 and the central tube 1. Among them, the lower end of the lower joint 9 protrudes from the lower end of the central tube 1, and a limiting ring groove is also provided on the inner wall of the lower end of the lower joint 9.

[0045] The upper inner wall of the positioning cylinder 10 is connected to the lower outer wall of the center tube 1 by threads, and the lower outer wall of the positioning cylinder 10 is provided with a limiting protrusion 101 adapted to the limiting ring groove on the lower joint 9, so that the lower joint 10 can be driven to move axially by screwing the positioning cylinder 10.

[0046] Due to the presence of the positioning cylinder 10, it can be screwed relative to the central pipe 1 to limit the position of the lower joint 9, thereby causing the sliding sleeve 3, the rubber cylinder 5, the upper sliding seat 6, the slips 7, the lower sliding seat 8, and the lower joint 9 to collide with each other. When the sliding sleeve 3 is pressed and moves downward, the rubber cylinder 5 will expand due to the compression, and the slips 7 will burst due to the compression, so as to achieve the sealing and fixing of the suspension sealing device relative to the well wall.

[0047] In addition, in this embodiment, a plurality of positioning holes 102 are evenly arranged on the inner wall of the lower end of the positioning cylinder 10. Correspondingly, the suspension sealing device also includes a matching recovery tool, such as Figure 3-4 As shown, the recovery tool includes a recovery rod 12, a disc-shaped body 13 is fixed to the lower end of the recovery rod 12, a plurality of blind holes are evenly opened on the circumferential side wall of the disc-shaped body 13, a positioning rod 14 is movably inserted in each blind hole, a spring 15 is also provided in the blind hole, two ends of the spring 15 are respectively fixedly connected to the bottom of the blind hole and the root of the positioning rod 14, and the spring 15 is used to provide elastic force to keep the positioning rod 14 away from the disc-shaped body 13.

[0048] Among them, the number of positioning rods 14 is the same as the number of positioning holes 102 on the positioning tube 10, and the tips of the positioning rods 14 are chamfered or rounded, or the tips of the positioning rods 14 are directly configured as hemispherical. Correspondingly, the lower edge of the inner wall of the central tube 1 is configured as a cone with the large end facing downward, so that the positioning rods 14 can be smoothly retracted when the recovery tool is retracted.

[0049] The use process of the suspension sealing device for underwater oil and gas production provided by the embodiment of the utility model is as follows:

[0050] When in use, the hanging sealing device is first sent to the specified position of the oil well by the sending tool, and then the sending tool applies a downward thrust to the sleeve 3, and the thrust can push the sleeve 3 to continue to move downward after cutting off the shear pin 4. When the position of the lower joint 9 is limited, the rubber cylinder 5 will expand due to extrusion to achieve the sealing of the oil well, and the slip 7 will be cracked due to extrusion to achieve fixation relative to the well wall, and then the sending tool can be retracted; when it is necessary to recover the hanging sealing device, the recovery tool is put in, and the disc 13 is in the middle. When the core tube 1 descends, the positioning rod 14 will be constrained by the inner wall of the center tube 1 until the disc-shaped body 13 reaches the position of the positioning hole 102 on the positioning cylinder 10. Under the action of the spring 15, the positioning rod 14 will extend into the positioning hole 102. At this time, the rotating recovery rod 12 can drive the positioning cylinder 10 to rotate, and then drive the lower joint 9 to descend. In this way, the squeezing force on the rubber cylinder 5 and the slip 7 can disappear, thereby releasing the sealing and fixation of the suspension sealing device relative to the oil well, and then the suspension sealing device can be retracted through the recovery rod 12.

[0051] It is easy to understand that the recovery tool is usually equipped with a sleeve, the inner diameter of the sleeve is the same as or slightly smaller than the inner diameter of the center tube 1, and the outer diameter is the same as or slightly smaller than the inner diameter of the center tube 1. Before use, the disc-shaped body 13 and the positioning rod 14 thereon are located in the sleeve, and the recovery tool is connected to the sleeve and lowered together. When the lower end of the sleeve is connected to the upper end of the center tube 1, as the recovery tool continues to be lowered, the disc-shaped body 13 and the positioning rod 14 thereon can smoothly enter the center tube 1.

[0052] It is easy to understand that a screw hole is also provided on the bottom end surface of the disc-shaped body 13, and the screw hole is connected to the blind hole for loading the spring 15. In this case, the blind hole is a through hole, and a stopper 16 is threadedly connected to the screw hole on the bottom end surface of the disc-shaped body 13, and the stopper 16 is used to provide support for the spring 15. When the suspension sealing device is recovered, the stopper 16 can be screwed down to make the spring 15 lose support, and the positioning rod 14 can easily enter the blind hole, thereby releasing the connection between the recovery tool and the positioning cylinder 10 in the suspension sealing device, and the recovery tool can be recovered at this time.

[0053] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments are made without departing from the principles and spirit of the present invention, and still fall within the scope of protection of the present invention.

Claims

1. A suspension sealing device for underwater oil and gas production, characterized in that: include: Central tube; An upper joint, wherein the inner wall of the lower end of the upper joint is threadedly connected to the outer wall of the upper end of the central tube, and a stop step is provided on the inner wall of the upper end of the upper joint; A sliding sleeve, wherein the sliding sleeve is movably sleeved on the outer side of the upper joint, and the lower end of the sliding sleeve is connected to the central pipe via a shear pin; A rubber cylinder, the rubber cylinder is sleeved on the central tube and is located below the sliding sleeve; An upper slide seat, the upper slide seat is movably sleeved on the central tube, and the upper slide seat is located below the rubber cylinder; Slips, the slips are sleeved on the central tube, and the inner wall of the upper end of the slips is matched with the inner wall of the lower end of the upper slide seat through an inclined surface or a conical surface; A lower sliding seat, wherein the lower sliding seat is movably sleeved on the central tube, and an upper inner wall of the lower sliding seat is matched with a lower inner wall of the slip through an inclined surface or a conical surface; A lower joint, which is movably and sealingly sleeved on the outer side of the lower end of the central tube, and a limiting annular groove is provided on the inner wall of the lower end of the lower joint; A positioning cylinder, wherein the inner wall of the upper end of the positioning cylinder is threadedly connected to the outer wall of the lower end of the central tube, the outer wall of the lower end of the positioning cylinder is provided with a limiting protrusion matched with the limiting ring groove, and a plurality of positioning holes are evenly arranged on the inner wall of the lower end of the positioning cylinder.

2. The suspension sealing device according to claim 1, characterized in that: The slips and the upper slide seat, as well as the slips and the lower slide seat are connected via shear pins.

3. The suspension sealing device according to claim 1, characterized in that: There are a plurality of rubber cylinders which are sequentially sleeved on the central tube, and an annular partition is arranged between two adjacent rubber cylinders.

4. The suspension sealing device according to claim 1, characterized in that: The suspension sealing device also includes a matching recovery tool, which includes a recovery rod, a disc-shaped body is fixed to the lower end of the recovery rod, and a plurality of positioning rods are evenly and movably inserted circumferentially on the circumferential side wall of the disc-shaped body. The positioning rods are adapted to the positioning holes, and a spring is provided between the positioning rod and the disc-shaped body, and the spring is used to provide an elastic force to keep the positioning rod away from the disc-shaped body.

5. The suspension sealing device according to claim 4, characterized in that: The lower edge of the inner wall of the central tube is tapered with the large end facing downward, so that the positioning rod can be forced to retract when the recovery tool is retracted.

6. The suspension sealing device according to claim 1, characterized in that: A sealing groove is provided on the inner wall of the upper end of the lower joint, and a sealing ring is installed in the sealing groove.

7. The suspension sealing device according to claim 1, characterized in that: A rack is arranged on the outer wall of the central tube, and a ratchet matched with the rack is arranged on the inner wall of the sliding sleeve to prevent the sliding sleeve from moving upward.

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