Integrated underground convenient recoverable safety pup joint

Abstract

The utility model discloses an integrated underground convenient recoverable safety pup joint which comprises a release mechanism, an outer sleeve connected to the outer side of the upper end of the release mechanism and a lower connector connected to the outer side of the lower end of the release mechanism. A blocking structure capable of blocking an inner channel of the releasing mechanism in a one-way mode is arranged in the releasing mechanism; the blocking structure comprises a check ring fixedly arranged on the inner wall of the releasing mechanism, a valve element with the lower end inserted into the check ring and a spring arranged outside the valve element in a sleeving mode. The internal blowout prevention valve has an internal blowout prevention function, when pressure exists on the lower portion of an oil pipe, the valve element is pushed upwards to abut against the blocking cambered surface, an internal channel can be effectively sealed through the valve element, the pressure is prevented from moving upwards, and the well control risk is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and natural gas drilling construction equipment, in particular to an integrated underground convenient and recyclable safety short circuit. Background Art

[0002] The short-circuit is mainly used to control the connection of the tubing, which is connected to the uppermost packer. After the packer is set, the pressure is continuously increased, and the piston is controlled to move downward, cut the control shear nail, and release the locking claw. The ground observation shows that the pump pressure suddenly drops, the casing returns water, and the hands are released. However, the short-circuit joints currently used, whether they are ball-dropping short-circuit or impact rod-dropping short-circuit, do not have the function of sealing the inside of the oil pipe. In oil and gas wells with abnormally active oil and gas, oil and gas overflow is very likely to occur during the running of the tubing, and the risk of well control is relatively high. Utility Model Content

[0003] The utility model aims to solve the above problems and provides an integrated underground convenient and recoverable safety short circuit, which can prevent the internal pressure of the oil pipe from rising and improve production safety.

[0004] The purpose of the utility model is achieved through the following technical solutions: an integrated underground convenient and retrievable safety short circuit, including a release mechanism, a sleeve connected to the outer side of the upper end of the release mechanism, and a lower joint connected to the outer side of the lower end of the release mechanism; a blocking structure capable of unidirectionally blocking the internal channel of the release mechanism is arranged inside the release mechanism.

[0005] The blocking structure includes a retaining ring fixedly arranged on the inner wall of the release mechanism, a valve core inserted into the retaining ring at the lower end, and a spring sleeved outside the valve core; a sealing arc surface is arranged on the inner wall of the release mechanism, a valve head is arranged on the top of the valve core to fit the sealing arc surface, and the upper and lower ends of the spring are respectively against the valve head and the retaining ring; a plurality of through holes are arranged circumferentially on the retaining ring, and the valve core can move downward when subjected to downward pressure, so that the internal channel of the release mechanism is connected up and down through the through holes.

[0006] Furthermore, the release mechanism includes a release claw whose upper end is connected to the outer sleeve and whose lower end is connected to the lower joint, a valve seat arranged inside the release claw, a piston connected to the upper end of the valve seat, a limiting ring connected to the lower end of the valve seat, and a sealing ball sealing the upper end of the piston; the limiting ring is connected to the lower end of the release claw, and the lower end of the release claw is connected to the lower joint; a shear pin is arranged between the release claw and the valve seat, a boss is arranged inside the lower joint, and the sealing arc surface is located at the lower end of the piston.

[0007] When the sealing ball is subjected to downward pressure, it can push the piston, the valve seat and the limit ring to cut off the shear pin and move downward, so that the limit ring loosens the release claw, and the release claw loosens the lower joint; and when the limit ring moves downward, it can abut against the boss, so that the lower joint moves downward and disengages from the release claw.

[0008] A plurality of claw pieces are circumferentially arranged at the lower end of the release claw, the claw piece is provided with claw piece teeth, and the lower joint teeth are provided on the inner wall of the lower joint; the limiting ring is provided with a narrow section and a wide section from top to bottom, the wide section abuts against the claw piece from inside to outside so that the claw piece teeth are engaged with the lower joint teeth; when the limiting ring moves downward, the wide section disengages from the claw piece so that the claw piece teeth and the lower joint teeth are separated.

[0009] The side wall of the piston is provided with an air hole and an upper sealing ring and a lower sealing ring that form a seal between the outer wall of the piston and the inner wall of the outer sleeve, and the upper sealing ring and the lower sealing ring are respectively located on the upper and lower sides of the air hole; the inner wall of the outer sleeve is provided with a recessed portion, and the recessed portion is located below the upper sealing ring; when the piston moves downward, the upper sealing ring can move to the position of the recessed portion to release the seal between the piston and the outer sleeve, so that the channel above the sealing ball can be connected with the channel below the sealing ball through the recessed portion and the air hole, and at this time, the lower joint is pushed away from the release claw.

[0010] A C-shaped snap ring is clamped on the outer wall of the piston, and the C-shaped snap ring abuts against the inner wall of the outer sleeve; a groove is provided on the inner wall of the outer sleeve; when the piston moves downward, the C-shaped snap ring can be clamped into the groove, and at this time the lower joint is pushed away from the release claw.

[0011] The upper end of the outer sleeve is connected with an upper joint.

[0012] Set screws are arranged between the upper joint and the outer sleeve, between the piston and the valve seat, between the outer sleeve and the release claw, and between the limit ring and the valve seat.

[0013] An anti-rotation ring is also sleeved on the outer side of the release claw, and a set screw is arranged between the anti-rotation ring and the release claw; anti-rotation teeth are circumferentially arranged on the lower end of the anti-rotation ring, and engaging teeth engaged with the anti-rotation teeth are arranged on the upper end of the lower joint.

[0014] Sealing rings are arranged between the upper joint and the outer sleeve, between the outer sleeve and the release claw, and between the lower joint and the release claw.

[0015] Compared with the prior art, the present application has the following beneficial effects: the utility model has an internal blowout prevention function. When there is pressure at the lower part of the oil pipe, the valve core is pushed upward to support the sealing arc surface. The internal channel can be effectively sealed through the valve core to prevent pressure from rising and reduce the risk of well control.

[0016] Some additional features of the present application may be explained in the following description. Some additional features of the present application will be apparent to those skilled in the art by inspection of the following description and corresponding drawings or understanding of the production or operation of the embodiments. The features disclosed in the present application may be realized and achieved by practice or use of various methods, means and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The exemplary embodiments of the present application and their descriptions are used to explain the present application and do not constitute a limitation of the present application. In each figure, the same reference numeral represents the same component.

[0018] Figure 1 It is a partial cross-sectional view of the utility model.

[0019] The figure marks in the above drawings are: 100—upper joint, 200—jacket, 210—set screw, 220—recess, 230—groove, 300—piston, 310—support arc surface, 320—upper sealing ring, 330—air hole, 340—lower sealing ring, 350—C-type retaining ring, 360—sealing arc surface, 400—valve seat, 500—valve core, 510—valve head, 520—spring, 530—retaining ring, 540—through hole, 600—release claw, 610—shear pin, 620—claw, 630—claw tooth, 700—limiting ring, 710—wide section, 720—narrow section, 800—lower joint, 810—lower joint tooth, 820—shoulder, 900—sealing ball, 1000—anti-rotation ring. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0021] It should be noted that if the description and claims of the present application and the above-mentioned drawings relate to the terms "first", "second", etc., they are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, if the terms "including" and "having" and any of their variations are involved, it is intended to cover non-exclusive inclusions, for example, the process, method, system, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0022] In this application, if the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0023] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0024] In addition, in this application, the terms "installed", "set", "provided with", "connected", "connected", "socketed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; 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 an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] Example

[0027] like Figure 1As shown, this embodiment discloses an integrated underground convenient and retrievable safety short circuit, which includes a release mechanism, a jacket 200 connected to the outer side of the upper end of the release mechanism, and a lower joint 800 connected to the outer side of the lower end of the release mechanism.

[0028] The upper end of the outer sleeve 200 is also connected to the upper joint 100, which is threadedly connected to the upper end of the outer sleeve 200, and a plurality of set screws 210 are arranged between the two to prevent rotation between the two; in addition, a sealing ring is arranged between the two. When in use, the upper joint 100 is connected to the upper end oil pipe, and the lower joint 800 is connected to the lower end oil pipe; the recyclable safety short-circuit of this embodiment is lowered into a predetermined position underground together with the oil pipe.

[0029] Specifically, the release mechanism includes a release claw 600, a valve seat 400, a piston 300, a limit ring 700 and a blocking ball 900. The release claw 600 is located inside the outer sleeve 200 and the lower joint 800, and its upper end is threadedly connected to the lower end of the outer sleeve 200, and a set screw 210 is also provided between the two to prevent rotation between the two; at the same time, a sealing ring is also provided between the two. The lower end of the release claw 600 is inserted into the lower joint 800, and a sealing ring is also provided between the two. In addition, a plurality of claw pieces 620 are circumferentially provided at the lower end of the release claw 600, and claw piece teeth 630 are provided on the outer wall of the claw piece 620; accordingly, a lower joint tooth 810 that can cooperate with the claw piece teeth 630 is provided on the inner wall of the lower joint 800.

[0030] The valve seat 400 is arranged inside the release claw 600, and a shear pin 610 is arranged between the two. When the valve seat 400 is subjected to an axial force, it can cut off the shear pin 610 and move axially.

[0031] The lower end of the piston 300 is threadedly connected to the upper end of the valve seat 400, and a set screw 210 is also provided between the two to prevent relative rotation. The piston 300 is located inside the outer sleeve 200, and its side wall is provided with an air hole 330 and an upper sealing ring 320 and a lower sealing ring 340 that form a seal between the outer wall of the piston 300 and the inner wall of the outer sleeve 200. The upper sealing ring 320 and the lower sealing ring 340 are respectively located on the upper and lower sides of the air hole 330. Correspondingly, a recessed portion 220 is provided on the inner wall of the outer sleeve 200, and the recessed portion 220 is located below the upper sealing ring 320. A supporting arc surface 310 is provided on the top of the piston 300, and the blocking ball 900 is placed on the supporting arc surface 310. The blocking ball 900 cooperates with the supporting arc surface 310, so that the blocking ball 900 can block the upper end of the piston 300, and then block the internal channel of the entire recyclable safety short circuit.

[0032] The inner wall of the limit ring 700 is threadedly connected to the outer wall of the lower end of the valve seat 400. The limit ring 700 is provided with a narrow section 720 and a wide section 710 from top to bottom. The diameter of the wide section 710 is slightly larger than the diameter of the circular ring surrounded by the claw piece 620, while the diameter of the narrow section 720 is smaller than the diameter of the circular ring surrounded by the claw piece 620. The wide section 710 is sleeved in the circular ring surrounded by the claw piece 620, so that the wide section 710 abuts against the claw piece 620 from the inside to the outside, so that the claw piece clamping teeth 630 are clamped with the lower joint clamping teeth 810. At this time, the lower joint 800 is fixed to the release claw 600, and the lower joint 800 cannot move axially.

[0033] In addition, an anti-rotation ring 1000 is sleeved on the outer side of the release claw 600, and a set screw 210 is arranged between the anti-rotation ring 1000 and the release claw 600, so that the anti-rotation ring 1000 and the release claw 600 cannot rotate relative to each other and move axially. The lower end of the anti-rotation ring 1000 is circumferentially provided with anti-rotation teeth, and the upper end of the lower joint 800 is provided with engaging teeth that mesh with the anti-rotation teeth, so that the lower joint 800 cannot rotate either.

[0034] When pressure is injected into the oil pipe, the sealing ball 900 blocks the internal passage of the recyclable safety short circuit, and the sealing ball 900 is subjected to downward pressure. At this time, the piston 300, the valve seat 400 and the limit ring 700 are axially pushed to cut the shear pin 610 and move downward. When the limit ring 700 moves downward, the wide section 710 withdraws from the ring surrounded by the claw piece 620, that is, the wide section 710 is separated from the claw piece 620, thereby releasing the bite between the claw piece clamping teeth 630 and the lower joint clamping teeth 810. The lower joint 800 is provided with a convex shoulder 820 inside. When the limit ring 700 continues to move downward, the limit ring 700 abuts against the convex shoulder 820, thereby pushing the lower joint 800 downward, so that the lower joint 800 is separated from the release claw 600. At this time, the lower joint 800 and the lower end oil pipe are completely loosened, and the remaining components and the upper end oil pipe can be recovered. At this time, the piston 300 moves downward, causing the upper sealing ring 320 to move to the position of the recessed portion 220, thereby releasing the seal between the piston 300 and the outer sleeve 200, allowing the channel above the sealing ball 900 to be connected to the channel below the sealing ball 900 through the recessed portion 220 and the air hole 330. The pressure at the upper and lower ends of the sealing ball 900 is balanced, and the piston 300, the valve seat 400 and the limit ring 700 are no longer pushed downward.

[0035] In addition, a blocking structure capable of unidirectionally blocking the internal channel of the release mechanism is also provided inside the valve seat 400. The blocking structure includes a retaining ring 530 fixedly arranged on the inner wall of the valve seat 400, a valve core 500 whose lower end is inserted into the retaining ring 530, and a spring 520 sleeved outside the valve core 500. A blocking arc surface 360 ​​is provided at the lower end of the piston 300, a valve head 510 that fits the blocking arc surface 360 ​​is provided at the top of the valve core 500, and the upper and lower ends of the spring 520 respectively abut against the valve head 510 and the retaining ring 530. Under the thrust of the spring 520, the valve head 510 fits the blocking arc surface 360 ​​upward, so that the valve core 500 blocks the internal channel; when the valve head 510 is subjected to downward pressure, it moves downward and separates from the blocking arc surface 360, and the fluid can flow from top to bottom, but cannot flow from bottom to top, so as to achieve unidirectional sealing of the internal channel, prevent pressure from rising, and reduce the risk of well control.

[0036] The retaining ring 530 is provided with a plurality of through holes 540 in the circumferential direction. When the valve core 500 is opened by downward pressure, the fluid can flow to the lower channel through the through holes 540 .

[0037] In addition, a C-shaped snap ring 350 is clamped on the outer wall of the piston 300, and the C-shaped snap ring 350 abuts against the inner wall of the outer sleeve 200. Correspondingly, a groove 230 is provided on the inner wall of the outer sleeve 200. After the piston 300 moves downward to separate the lower joint 800 from the release claw 600, the C-shaped snap ring 350 just moves to the position of the groove 230, and the C-shaped snap ring 350 is clamped in the groove 230, thereby fixing the piston 300 to prevent the piston 300, the valve seat 400 and the limit ring 700 from being pushed upward and reset under the pressure from below.

[0038] During specific implementation, an anti-slip strip is provided on the outer wall of the lower connector 800 to facilitate installation of the lower connector 800 .

[0039] It should be noted that all features disclosed in this specification, or steps in all methods or processes disclosed, except for mutually exclusive features and / or steps, can be combined in any manner.

[0040] In addition, the above specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the utility model, and these solutions also belong to the disclosure scope of the utility model and fall within the protection scope of the utility model. Those skilled in the art should understand that the utility model specification and its drawings are illustrative and do not constitute a limitation of the claims. The protection scope of the utility model is defined by the claims and their equivalents.

Claims

1. An integrated underground convenient and retrievable safety short circuit, comprising a release mechanism, a jacket (200) connected to the outer side of the upper end of the release mechanism, and a lower connector (800) connected to the outer side of the lower end of the release mechanism; characterized in that: The release mechanism is provided with a blocking structure capable of unidirectionally blocking the internal passage of the release mechanism; The blocking structure comprises a retaining ring (530) fixedly arranged on the inner wall of the release mechanism, a valve core (500) with its lower end inserted into the retaining ring (530), and a spring (520) sleeved outside the valve core (500); a blocking arc surface (360) is arranged on the inner wall of the release mechanism, a valve head (510) is arranged on the top of the valve core (500) and is in contact with the blocking arc surface (360), and the upper and lower ends of the spring (520) are respectively against the valve head (510) and the retaining ring (530); a plurality of through holes (540) are arranged circumferentially on the retaining ring (530), and the valve core (500) can move downward when subjected to downward pressure, so that the internal channel of the release mechanism is connected up and down via the through holes (540).

2. The integrated underground convenient and retrievable safety short circuit according to claim 1 is characterized in that: The release mechanism comprises a release claw (600) whose upper end is connected to the outer sleeve (200) and whose lower end is connected to the lower joint (800), a valve seat (400) arranged inside the release claw (600), a piston (300) connected to the upper end of the valve seat (400), a limit ring (700) connected to the lower end of the valve seat (400), and a blocking ball (900) blocking the upper end of the piston (300); the limit ring (700) is connected to the lower end of the release claw (600), and the lower end of the release claw (600) is connected to the lower joint (800); a shear pin (610) is arranged between the release claw (600) and the valve seat (400), a boss (820) is arranged inside the lower joint (800), and the blocking arc surface (360) is located at the lower end of the piston (300); When the blocking ball (900) is subjected to downward pressure, it can push the piston (300), the valve seat (400) and the limiting ring (700) to cut off the shear pin (610) and move downward, so that the limiting ring (700) loosens the release claw (600), and the release claw (600) loosens the lower joint (800); and, when the limiting ring (700) moves downward, it can abut against the boss (820), so that the lower joint (800) moves downward and disengages from the release claw (600).

3. The integrated underground convenient and retrievable safety short circuit according to claim 2 is characterized in that: A plurality of claw pieces (620) are circumferentially arranged at the lower end of the release claw (600), and claw piece locking teeth (630) are arranged on the claw piece (620), and lower joint locking teeth (810) are arranged on the inner wall of the lower joint (800); the limiting ring (700) is provided with a narrow section (720) and a wide section (710) from top to bottom, and the wide section (710) abuts against the claw piece (620) from inside to outside, so that the claw piece locking teeth (630) and the lower joint locking teeth (810) are engaged; when the limiting ring (700) moves downward, the wide section (710) is disengaged from the claw piece (620), so that the claw piece locking teeth (630) and the lower joint locking teeth (810) are separated.

4. The integrated underground convenient and retrievable safety short circuit according to claim 3 is characterized in that: The side wall of the piston (300) is provided with an air hole (330) and an upper sealing ring (320) and a lower sealing ring (340) for forming a seal between the outer wall of the piston (300) and the inner wall of the outer sleeve (200), and the upper sealing ring (320) and the lower sealing ring (340) are respectively located on the upper and lower sides of the air hole (330); the inner wall of the outer sleeve (200) is provided with a recessed portion (220), and the recessed portion (220) is located in the upper sealing portion. When the piston (300) moves downward, the upper sealing ring (320) can move to the position of the recessed portion (220) to release the seal between the piston (300) and the outer sleeve (200), so that the channel above the blocking ball (900) can be connected with the channel below the blocking ball (900) through the recessed portion (220) and the air hole (330), and at this time, the lower joint (800) is pushed away from the release claw (600).

5. The integrated underground convenient and retrievable safety short circuit according to claim 4 is characterized in that: A C-shaped snap ring (350) is clamped on the outer wall of the piston (300), and the C-shaped snap ring (350) abuts against the inner wall of the outer sleeve (200); a groove (230) is provided on the inner wall of the outer sleeve (200); when the piston (300) moves downward, the C-shaped snap ring (350) can be clamped into the groove (230), and at this time, the lower joint (800) is pushed away from the release claw (600).

6. The integrated underground convenient and retrievable safety short circuit according to claim 5 is characterized in that: The upper end of the outer sleeve (200) is connected to an upper joint (100).

7. The integrated underground convenient and retrievable safety short circuit according to claim 6 is characterized in that: Set screws (210) are provided between the upper joint (100) and the outer sleeve (200), between the piston (300) and the valve seat (400), between the outer sleeve (200) and the release claw (600), and between the limit ring (700) and the valve seat (400).

8. The integrated underground convenient and retrievable safety short circuit according to claim 7 is characterized in that: An anti-rotation ring (1000) is also sleeved on the outer side of the release claw (600), and a set screw (210) is arranged between the anti-rotation ring (1000) and the release claw (600); anti-rotation teeth are circumferentially arranged at the lower end of the anti-rotation ring (1000), and engaging teeth that mesh with the anti-rotation teeth are arranged at the upper end of the lower joint (800).

9. The integrated underground convenient and retrievable safety short circuit according to claim 8 is characterized in that: Sealing rings are provided between the upper joint (100) and the outer sleeve (200), between the outer sleeve (200) and the release claw (600), and between the lower joint (800) and the release claw (600).

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