CN219197260U - Hydraulic back-off safety joint - Google Patents
Hydraulic back-off safety joint Download PDFInfo
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- CN219197260U CN219197260U CN202223233413.3U CN202223233413U CN219197260U CN 219197260 U CN219197260 U CN 219197260U CN 202223233413 U CN202223233413 U CN 202223233413U CN 219197260 U CN219197260 U CN 219197260U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses a hydraulic back-off safety joint, which comprises an upper joint, a lower joint, a locking block limiting mechanism and a hydraulic unlocking mechanism, wherein the upper joint is connected with the lower joint through a connecting rod; the upper joint and the lower joint are connected together through threads and are mutually locked through a locking block limiting mechanism, and a hydraulic unlocking mechanism is arranged at the periphery of the locking block limiting mechanism; the locking piece limiting mechanism comprises a locking piece; the lower joint is provided with a through groove, and the outer wall of the upper joint is provided with a locking groove; the locking block is inserted into the penetrating groove, and the front end of the locking block is inserted into the locking groove; the inner end of the locking block is an arc-shaped end, and the bottom of the locking groove is an arc-shaped surface and is matched with the arc-shaped end of the locking block in shape. The structure is simple and reliable, the operation is simple and convenient, the pressure boosting and unlocking are needed, then the reverse buckling and the separation are needed, the safety and the reliability of the safety joint in the use process can be effectively improved, the accident risk is further reduced, and the operation accident is avoided.
Description
Technical Field
The utility model relates to the field of underground matched tools for petroleum exploitation, in particular to a hydraulic inverted safety joint.
Background
In the process of oil-gas underground operation, the smooth pulling-out of the original well pipe column has great significance for simplifying the process and saving the cost, and provides important basis for the formulation of follow-up measures. The safety joint is used as an auxiliary tool for underground operation and production pipe columns, so that the complexity of the original well pipe column measures can be effectively reduced, the production time is shortened, and the construction cost is saved. The tool is generally connected to a complex part of a downhole tubular string, and the tubular string can be disconnected from a safety joint when needed, so that good conditions are provided for the development of follow-up measures.
Currently, three types of reported safety connectors are mainly used:
(1) the upper joint and the lower joint of the inverted safety joint are connected through left-handed threads, and when a pipe column is clamped underground, the pipe column needs to be rotated clockwise to finish the disconnection with an underground tool;
(2) the hydraulic safety joint generally adopts a wellhead ball injection, and an oil pipe is pressed to shear pins so as to realize the disconnection from a downhole tool;
(3) the electric control type safety joint controls a downhole circuit through a wellhead and is disconnected with a downhole tool by providing power by a downhole battery.
The three safety joints have certain limitations:
(1) the reverse-buckling type safety joint needs to be disconnected in a movable pipe column mode, the disconnection mode has the problems of poor safety and low success rate, when the pipe column structure is complex, the reverse-buckling type safety joint is easy to disconnect due to the fact that torque is not transmitted in place and cannot be matched with a rotary seat packer for use, and the design of the safety joint is contradicted;
(2) the hydraulic safety joint is connected with the upper joint and the lower joint only by the shear pins, and is easily influenced by operation and well conditions (such as a well head, an over-high lowering speed and the like) in the operation process, so that the hydraulic safety joint is broken and disconnected in the middle, and an operation accident is caused;
(3) the electronic control type safety joint is limited by the temperature of the electronic product, so that the electronic control type safety joint cannot be applied to a high-temperature deep well, and has the problems of complex structure, poor stability and the like, thereby limiting the application of the electronic control type safety joint.
Publication (bulletin) number: CN101793127B, publication (date): 2012-03-28 discloses an anti-drop back-off device, a tubing coupling is connected with an upper joint, a back-off inner joint inner shoulder is hung on an outer shoulder of the upper joint, a back-off outer thread at the lower part of the back-off inner joint is connected with a back-off inner thread of the back-off outer joint, the upper part of a lock sleeve is sleeved outside the upper joint, a convex key is arranged on the upper joint, a lock key groove is arranged in the lock sleeve, the convex key is inserted in the lock key groove, the lock sleeve is fixed on the upper joint by a shear pin, a positive key groove is arranged in the back-off inner joint, the convex key is inserted in the positive key groove, a spring is arranged between the lock sleeve and the back-off inner joint, a groove key is arranged at the lower part of the lock sleeve, and a groove key is arranged at the upper part of the back-off inner joint, and the groove keys of the lock sleeve and the lock sleeve are buckled mutually. Under the action of the convex key, the lock key groove, the groove key at the lower part of the lock sleeve and the groove key at the upper part of the buckling inner joint, when the oil pipe is rotated positively, the junction of the reverse buckling external thread at the lower part of the reverse buckling inner joint and the reverse buckling internal thread of the reverse buckling outer joint can not be tripped, and the tool can be matched with a tool needing to rotate the oil pipe positively.
Publication (bulletin) number: CN107489387B, publication (date): 2018-08-10 discloses a hydraulic back-off device, which comprises an anchoring device, a pressurizing device, a power transmission device and a power output device, wherein the pressurizing device for increasing pressure is arranged at the lower part of the anchoring device, the power transmission device for power transmission is arranged at the lower part of the pressurizing device, and the power output device for hydraulic power output is arranged at the lower part of the power output device; compared with the prior art, the hydraulic drive is adopted as the driving force, the axial power shaft, the quick-change driving head and the rotary power shaft are adopted as main power actuating mechanisms, the axial power shaft and the quick-speed driving head are in split type structures, the processing, the replacement and the maintenance of parts are facilitated, the power output adopts the design of double ratchet wheel sets, the inner ratchet wheel and the outer ratchet wheel are mutually independent, the inner ratchet wheel is not influenced by the rotation torque of the lower part, the outer ratchet wheel ensures that the generated back-off torque does not rotate, the reliable and safe operation of the tool is ensured, the output torque is large, and the operation is simple.
Publication (bulletin) number: CN2692334Y, publication (date): 2005-04-13 discloses a hydraulic back-off dual-purpose release used in the petroleum industry for multi-layer production of oil wells or water injection wells. The hydraulic release mechanism comprises a connecting sleeve, a control piston, a jacket, a back-off joint, a ball seat and a steel ball, wherein the connecting sleeve is connected with the back-off joint through a locking block, and the ball seat is arranged in the connecting sleeve. The control piston and the baffle ring are arranged on the outer diameter step of the connecting sleeve, and the outer cover is arranged outside the control piston and the baffle ring. The hydraulic releasing mechanism is connected with the upper joint and the lower joint, and the back-off joint is in back-off connection with the lower joint. The tool has two working modes of hydraulic pressure and back-off, provides a higher safety coefficient for the primary success rate of the downhole string releasing operation, reduces the operation time and reduces the production cost.
Publication (bulletin) number: CN202946070U, publication (date): 2013-05-22 discloses a hydraulic rotating back-off releasing tool, which comprises an upper joint, a positioning seat sleeve, a releasing ball seat and a connecting sleeve, wherein an upper joint pipe cavity is arranged in the upper joint, the lower part of the upper joint is connected with the upper part of the positioning seat sleeve through left-handed threads, a positioning seat cavity is arranged in the positioning seat sleeve, and the releasing ball seat capable of being moved downwards through holding down is fixedly arranged in the positioning seat cavity. The hydraulic release device is reasonable and compact in structure and convenient to use, the positioning seat sleeve and the connecting sleeve are fixedly connected through the release clamping blocks, the release ball seat is used for shearing shear pins through holding pressure and moving downwards, the release clamping blocks are enabled to radially move to unlock the positioning seat sleeve and the connecting sleeve, when the underground situation is complex and hydraulic release cannot be achieved, release is achieved through the left-handed threaded connection between the upper connector and the positioning seat sleeve through back-off, reliability and application range of release tools are greatly improved, and the hydraulic release device has the advantages of being safe, reliable, simple, convenient and efficient.
Publication (bulletin) number: CN2739344Y, publication (date): 2005-11-09 relates to a hydraulic release joint for drilling and well completion operation of an oil-gas field, which mainly comprises an upper joint, a shear screw, a central tube, a piston, a lock tongue and a lower joint, wherein the upper joint is in threaded connection with the central tube and the lock tongue, the piston is positioned in an annular space between the central tube and the lock tongue, the shear screw fixes the lock tongue on the piston, a conical surface is processed at the inner top end of the piston, and a radial through hole is processed at the corresponding position of the central tube; the lower end of the lock tongue is provided with an inner boss and an outer boss, the inner boss corresponds to the boss at the lower end of the piston, and the outer boss of the lock tongue is extruded into the inner concave part of the lower joint sleeved on the lock tongue; the boss end of the lock tongue is provided with a plurality of axial long grooves which are symmetrically distributed. By improving the tool structure, the reverse buckling releasing operation mode adopted in the prior art is broken through, releasing operation is carried out in a hydraulic mode, and the problem that releasing can not be carried out in a conventional reverse buckling mode due to special reasons such as incapability of allowing rotation of a well completion string is solved.
Publication (bulletin) number: CN2864080Y, publication (date): 2007-01-31 relates to a hydraulic releasing tool for oil and gas field drilling and well completion operation, wherein a shear ring and a lock tongue are positioned in an annular space between a piston and a double male connector, a shear screw fixes the shear ring on the piston, an outer step is arranged at the bottom end of the piston and is matched with an inner step of the lock tongue, a hydraulic cavity is formed at the middle step position between the lock tongue and the piston, a liquid flow through hole is formed on the piston and is communicated with the piston, and the shear ring and the lock tongue can slide along the piston. By improving the tool structure, the reverse buckling releasing operation mode adopted in the prior art is broken through, releasing operation is carried out in a hydraulic mode, and the problem that releasing can not be carried out in a conventional reverse buckling mode due to special reasons such as incapability of allowing rotation of a well completion string is solved.
The technical scheme of the above disclosed technology, the technical problems to be solved and the generated beneficial effects are different from those of the utility model, and the technical documents disclosed above have no technical teaching aiming at more technical features of the utility model, the technical problems to be solved and the beneficial effects.
Disclosure of Invention
Aiming at the defects in the prior art, the utility model aims to provide the hydraulic back-off safety joint which is simple and reliable in structure, simple and convenient to operate, and capable of effectively improving the safety and reliability of the safety joint in the use process, further reducing the accident risk and avoiding the operation accident, and the back-off is separated after the pressure is firstly boosted and unlocked.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
a hydraulic back-off safety joint comprises an upper joint, a lower joint, a locking block limiting mechanism and a hydraulic unlocking mechanism; the upper joint and the lower joint are connected together through threads and are mutually locked through a locking block limiting mechanism, and a hydraulic unlocking mechanism is arranged at the periphery of the locking block limiting mechanism;
the locking piece limiting mechanism comprises a locking piece;
the lower joint is provided with a through groove, and the outer wall of the upper joint is provided with a locking groove;
the locking block is inserted into the penetrating groove, and the front end of the locking block is inserted into the locking groove; the bottom surface of the through groove is provided with an inclined surface with high inside and low outside, so that the locking piece can slide out and unlock more conveniently;
the inner end of the locking block is an arc-shaped end, and the bottom of the locking groove is an arc-shaped surface and is matched with the arc-shaped end of the locking block in shape.
Further, at least one through groove is formed, at least one locking block is arranged, and the number of the through groove, the locking groove and the locking block is identical.
Further, the hydraulic unlocking mechanism comprises a jacket, a piston, a shear pin and a lower blocking cap;
the inner wall of the upper half section of the outer sleeve is provided with an inner groove for releasing the locking block, the inner wall of the upper half section of the outer sleeve is provided with a compression surface for compressing the outer end surface of the locking block, the compression surface is positioned below the inner groove, and a piston cavity is formed between the inner wall of the lower half section of the outer sleeve and the outer wall of the lower joint;
the piston is arranged in the piston cavity, and the lower joint is provided with a radial pressure transmission hole communicated with the piston cavity;
the outer sleeve and the lower joint are also fixedly connected through shear pins;
the lower retaining cap is connected to the bottom end of the outer sleeve, and the inner wall of the lower retaining cap is in sealing sliding connection with the outer wall of the lower joint.
Further, the outer wall of the lower joint is provided with a lower limit shoulder capable of preventing the piston from ascending, and the outer wall of the upper joint is provided with an upper limit shoulder capable of preventing the jacket from ascending.
Further, the outer wall of the lower joint is also connected with a positioning ring, the positioning ring is positioned below the lower retaining cap, and the travel distance from the upper end surface of the positioning ring to the lower end surface of the lower retaining cap is ensured to be capable of completely releasing the locking piece into the inner groove; and meanwhile, the positioning ring is used as a limiting piece capable of preventing the sliding sleeve from descending.
Further, the groove depth of the inner groove of the outer sleeve is larger than or equal to the groove depth of the locking groove.
Compared with the prior art, the utility model has the following beneficial effects:
1. the hydraulic unlocking mechanism and the locking block limiting mechanism are integrally designed, the shear pins are required to be lifted and sheared firstly, the piston drives the jacket to move downwards, the locking block can be separated in a right-hand manner after being separated, the short plates with poor safety and low success rate of the known inverted safety joint and the short plates with easy midway separation of the known hydraulic safety joint are supplemented, and the tool reliability is improved;
2. the hydraulic unlocking mechanism consists of a piston, a shear pin and a jacket, so that the shear pin is not influenced by operation and well conditions and is only controlled by oil pressure, the safety joint of the utility model realizes a separation function in a combined operation mode of boosting pressure firstly and back-off secondly, and the safety of tools is improved;
3. the locking piece limiting mechanism is a locking piece, the inner surface of the outer sleeve is pressed in the radial through groove of the lower connector, meanwhile, the inner end of the locking piece is an arc end, the arc end of the locking piece is inserted into the locking groove formed in the outer wall of the upper connector, the arc end of the locking piece is limited and fixed, the upper connector and the lower connector cannot rotate relatively by taking the axis as the center before falling out, torque can be transmitted, the locking piece is matched with the rotary seat sealing packer, and tool adaptability is improved.
Drawings
Fig. 1 is a schematic structural view of a hydraulic inverted safety joint according to the present utility model.
In the figure: the device comprises an upper joint 1, a jacket 2, a sealing element 3, a locking block 4, a piston 5, a shear pin 6, a lower retaining cap 7, a positioning ring 8 and a lower joint 9.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1:
as shown in fig. 1, a hydraulic back-off safety joint of the present embodiment mainly includes an upper joint 1, an outer sleeve 2, a sealing member 3, a locking piece 4, a piston 5, a shear pin 6, a lower stop cap 7, a positioning ring 8, and a lower joint 9. The upper joint 1 and the lower joint 9 are connected through left-handed threads, and the opening of the locking groove of the upper joint 1 corresponds to the penetrating groove of the lower joint 9; the lock blocks 4 can be arranged in a plurality of through grooves which are uniformly distributed and embedded in the lower joint 9; the piston 5 and the lower joint 9 are positioned by the shear pin 6 and sealed by a sealing element; the outer sleeve 2 and the lower joint 9 are sealed by a sealing element 3; the jacket 2 presses the locking piece 4 in the through groove of the lower joint 9; the outer sleeve 2 is connected with the lower baffle cap 7 through threads; the positioning ring 8 is connected with the lower joint 9 through threads.
The upper joint is provided with a boss limiting structure at the upper end, a left-handed thread is arranged in the middle of the upper joint, and a plurality of locking grooves are uniformly formed in the outer ring at the lower end of the upper joint;
the inner ring at the upper end of the lower joint is provided with left-handed threads, the left-handed threads are connected with the upper joint in a matching way, the outer ring is provided with a sealing ring annular groove, the lower joint is uniformly provided with a plurality of through grooves corresponding to the locking grooves at the lower end of the upper joint, the middle part of the lower joint is provided with a punching hole and a shear pin jack, and the central holes of the upper joint and the lower joint are coaxial and mutually communicated; the bottom surface of the through groove is provided with an inclined surface with high inside and low outside;
the locking blocks are uniformly arranged in the lower joint penetrating grooves and embedded in the upper joint locking grooves to connect the upper joint with the lower joint;
the piston is provided with a shear pin jack, corresponds to the lower connector shear pin jack, and is vertically and penetratingly connected with the lower connector and the piston, and the inner ring and the outer ring of the piston are respectively provided with a sealing ring annular groove;
the inner ring in the middle of the outer sleeve is provided with an inner groove, the lower end of the outer sleeve is provided with a right-handed thread, and the outer sleeve is connected with a blocking cap.
The upper joint, the lower joint, the locking piece, the piston and the outer sleeve are fixedly connected in sequence.
The aim and the technical problems of the utility model can be further realized by adopting the following technical measures.
The locking piece is pressed by the inner surface of the pipe wall of the outer sleeve and is arranged in the lower joint penetrating groove, and is embedded into the locking groove at the lower end of the upper joint, so that the upper joint and the lower joint cannot rotate relative to each other by taking the axis as the center.
The lower part of the outer sleeve is connected with a lower baffle cap, and a piston cylinder closed space is formed by the lower baffle cap and the lower joint.
The lower part of the lower joint is connected with a positioning ring to prevent the jacket from falling off along the axis after boosting.
When the pressure in the hydraulic back-off safety joint channel is increased from the first pressure to the second pressure, the piston shears the shear pin and moves downwards along the axial direction under the action of the pressure at the punching hole of the lower joint.
The piston pushes the lower baffle cap and drives the outer sleeve to move downwards along the axial direction.
The locking piece is released, and the outer end of the locking piece moves radially outwards into the inner groove of the outer sleeve, and the locking piece releases the limiting fixation between the upper connector and the lower connector.
Further, the upper joint and the lower joint can be separated in a right-handed manner by taking the axis as the center.
(1) The following steps: the hydraulic back-off safety joint is connected to the upper part of the tool section, the piston 5 and the locking block 4 do not act, are limited and fixed, can transmit torque, and ensure that the tool is safely put into a well.
(2) And (3) disengaging: when the pipe column needs to be disconnected from the safety joint, the pressure of the oil pipe is raised to the opening pressure, and the following mechanical actions can be carried out in the safety joint:
(1) the piston 5 shears the shear pin 6 and moves downwards along the axial direction;
(2) the piston 5 continues to push the lower blocking cap 7 to drive the outer sleeve 2 to move downwards along the axial direction until the lower blocking cap 7 touches the positioning ring 8;
(3) the locking piece 4 is separated into the groove in the outer sleeve 2, the right-handed pipe column is arranged, and the upper joint 1 and the lower joint 9 are separated at the left-handed thread.
The safety joint is provided with the integrated design of the hydraulic unlocking mechanism and the locking block limiting mechanism, the shear pins are required to be sheared by boosting, the piston drives the jacket to move downwards, the locking block can be separated from the jacket in a right-hand manner after separation and release, short plates with poor safety and low success rate of the known inverted safety joint and short plates with easy midway separation of the known hydraulic safety joint are supplemented, and the reliability of a tool is improved;
the safety joint realizes the separation function in a combined operation mode of boosting and back-off, the upper joint and the lower joint cannot rotate relatively by taking the axis as the center before the locking block is separated, the torque can be transmitted, the safety joint can be matched with a rotary seat sealing packer for use, and the process adaptability is improved;
the safety joint can adjust the starting pressure by adjusting the number of preset shear pins so as to adapt to underground pipe columns under different working conditions, and the pressure is controllable on the basis of ensuring the reliability of a tool.
The hydraulic back-off safety joint is provided with the hydraulic unlocking mechanism and the locking block limiting mechanism, is simple and reliable in structure and simple and convenient to operate, needs to be boosted and unlocked firstly and then separated in a back-off mode, can effectively improve the safety and reliability of the safety joint in the use process, further reduces the accident risk and avoids operation accidents.
Example 2:
as shown in fig. 1, a hydraulic back-off safety joint of the embodiment comprises an upper joint, a lower joint, a locking block limiting mechanism and a hydraulic unlocking mechanism; the upper joint and the lower joint are connected together through threads and are mutually locked through a locking block limiting mechanism, and a hydraulic unlocking mechanism is arranged at the periphery of the locking block limiting mechanism;
the locking piece limiting mechanism comprises a locking piece;
the lower joint is provided with a through groove, and the outer wall of the upper joint is provided with a locking groove;
the locking block is inserted into the penetrating groove, and the front end of the locking block is inserted into the locking groove;
the inner end of the locking block is an arc-shaped end, and the bottom of the locking groove is an arc-shaped surface and is matched with the arc-shaped end of the locking block in shape. In order to facilitate the released locking piece to automatically slide out of the through groove, the bottom surface of the through groove can be provided with an inclined surface with high inside and low outside, when the inner groove aligns to the locking piece, the locking piece is not pressed any more, and the locking piece slides out of the inclined surface at the bottom of the through groove by self gravity, so that the locking piece is separated from the locking groove of the upper connector.
Further, at least one through groove is formed, at least one locking block is arranged, and the number of the through groove, the locking groove and the locking block is identical.
Further, the hydraulic unlocking mechanism comprises a jacket, a piston, a shear pin and a lower blocking cap;
the inner wall of the upper half section of the outer sleeve is provided with an inner groove for releasing the locking block, the inner wall of the upper half section of the outer sleeve is provided with a compression surface for compressing the outer end surface of the locking block, the compression surface is positioned below the inner groove, and a piston cavity is formed between the inner wall of the lower half section of the outer sleeve and the outer wall of the lower joint;
the piston is arranged in the piston cavity, and the lower joint is provided with a radial pressure transmission hole communicated with the piston cavity;
the outer sleeve and the lower joint are also fixedly connected through shear pins;
the lower retaining cap is connected to the bottom end of the outer sleeve, and the inner wall of the lower retaining cap is in sealing sliding connection with the outer wall of the lower joint.
Example 3:
as shown in fig. 1, a hydraulic back-off safety joint of the embodiment comprises an upper joint, a lower joint, a locking block limiting mechanism and a hydraulic unlocking mechanism; the upper joint and the lower joint are connected together through threads and are mutually locked through a locking block limiting mechanism, and a hydraulic unlocking mechanism is arranged at the periphery of the locking block limiting mechanism;
the locking piece limiting mechanism comprises a locking piece;
the lower joint is provided with a through groove, and the outer wall of the upper joint is provided with a locking groove;
the locking block is inserted into the penetrating groove, and the front end of the locking block is inserted into the locking groove;
the inner end of the locking block is an arc-shaped end, and the bottom of the locking groove is an arc-shaped surface and is matched with the arc-shaped end of the locking block in shape.
Further, at least one through groove is formed, at least one locking block is arranged, and the number of the through groove, the locking groove and the locking block is identical.
Although all of the above embodiments use fig. 1, it will be apparent to those skilled in the art that a separate drawing is not provided to illustrate the embodiments, so long as the missing components or structural features are removed from the drawing. As will be clear to a person skilled in the art. Of course, the more components of the embodiment are just the optimal embodiment, the fewer components of the embodiment are basic embodiments, but the basic object of the utility model can be achieved, so all the modified embodiments are within the protection scope of the utility model.
All parts themselves which are not discussed in the present application and all parts connection modes in the present application belong to the known technology in the technical field. The preparation can be directly applied and is not repeated.
In the present utility model, the term "plurality" means two or more, unless explicitly defined otherwise. The terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or units referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model.
In the description of the present specification, the terms "one embodiment," "some embodiments," "particular embodiments," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (5)
1. A hydraulic back-off safety joint comprises an upper joint, a lower joint, a locking block limiting mechanism and a hydraulic unlocking mechanism; the upper joint and the lower joint are connected together through threads and are mutually locked through a locking block limiting mechanism, and a hydraulic unlocking mechanism is arranged at the periphery of the locking block limiting mechanism;
the lock block limiting mechanism is characterized by comprising a lock block;
the lower joint is provided with a through groove, and the outer wall of the upper joint is provided with a locking groove;
the locking block is inserted into the penetrating groove, and the front end of the locking block is inserted into the locking groove;
the inner end of the locking block is an arc-shaped end, the bottom of the locking groove is an arc-shaped surface and is matched with the arc-shaped end of the locking block in shape;
the hydraulic unlocking mechanism comprises a jacket, a piston, a shear pin and a lower blocking cap;
the inner wall of the upper half section of the outer sleeve is provided with an inner groove for releasing the locking block, the inner wall of the upper half section of the outer sleeve is provided with a compression surface for compressing the outer end surface of the locking block, the compression surface is positioned below the inner groove, and a piston cavity is formed between the inner wall of the lower half section of the outer sleeve and the outer wall of the lower joint;
the piston is arranged in the piston cavity, and the lower joint is provided with a radial pressure transmission hole communicated with the piston cavity;
the outer sleeve and the lower joint are also fixedly connected through shear pins;
the lower retaining cap is connected to the bottom end of the outer sleeve, and the inner wall of the lower retaining cap is in sealing sliding connection with the outer wall of the lower joint.
2. The hydraulic back-off safety joint according to claim 1, wherein at least one through groove is formed, at least one locking block is formed, and the number of the through groove, the locking groove and the locking block is identical.
3. The hydraulic back-off safety joint according to claim 2, wherein the outer wall of the lower joint is provided with a lower limit shoulder capable of preventing the piston from ascending, and the outer wall of the upper joint is provided with an upper limit shoulder capable of preventing the jacket from ascending.
4. The hydraulic back-off safety joint according to claim 3, wherein the outer wall of the lower joint is further connected with a positioning ring, the positioning ring is located below the lower retaining cap, and the travel distance from the upper end surface of the positioning ring to the lower end surface of the lower retaining cap is ensured to be capable of completely releasing the locking piece into the inner groove; and meanwhile, the positioning ring is used as a limiting piece capable of preventing the sliding sleeve from descending.
5. The hydraulic back-off safety joint according to claim 4, wherein the depth of the inner groove of the outer sleeve is greater than or equal to the depth of the locking groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223233413.3U CN219197260U (en) | 2022-11-21 | 2022-11-21 | Hydraulic back-off safety joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223233413.3U CN219197260U (en) | 2022-11-21 | 2022-11-21 | Hydraulic back-off safety joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219197260U true CN219197260U (en) | 2023-06-16 |
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ID=86703676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223233413.3U Active CN219197260U (en) | 2022-11-21 | 2022-11-21 | Hydraulic back-off safety joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219197260U (en) |
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2022
- 2022-11-21 CN CN202223233413.3U patent/CN219197260U/en active Active
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