A drill-in safety trip tool and a drill-in safety trip tool assembly

Abstract

This invention discloses a safe release tool for drilling, comprising a first connector, a second connector, a valve core, and an elastic buckle. The first connector and the second connector are connected by the elastic buckle in a locked position to prevent the first connector from detaching from the second connector. The valve core has a through channel connecting an inlet cavity formed on the first connector and an outlet cavity formed on the second connector. A connecting channel is also formed between the inlet cavity and the outlet cavity, and the elastic buckle can block the connecting channel when it is locked. The valve core and the first connector are abutted by a first elastic device. When the through channel is blocked by the blocking component, the valve core can be pushed by the fluid in the inlet cavity to move until the inlet cavity connects with the connecting channel, and the fluid entering the connecting channel can push the elastic buckle out of the locked position. This safe release tool for drilling can effectively solve the problem of inconvenient detachment between two connectors. This invention also discloses a safe release tool assembly for drilling including the above-mentioned safe release tool for drilling.

Description

Technical Field

[0001] This invention relates to the field of drilling technology, and more specifically, to a safe release tool while drilling, and to a safe release tool assembly while drilling that includes the above-mentioned safe release tool while drilling. Background Technology

[0002] During the drilling of deep and ultra-deep wells, it is common to encounter situations such as multiple pressure systems in deep formations and unstable well walls, which can lead to frequent stuck drill bits and buried drill bits, resulting in long time losses and high handling costs.

[0003] There are two types of conventional downhole safety joints: sawtooth thread type and slider type. They are mainly used in conjunction with appropriate tools when fish are found in the well, for fishing, milling and testing operations. The internal sawtooth or slider structure has relatively low tensile, compressive, bending and torsional mechanical strength. It can only meet the requirements of downhole fishing and milling operations, but cannot meet the high drilling pressure, high speed and high torque required during normal drilling, and cannot realize the function of safe release while drilling.

[0004] Chinese patent CN116537711A discloses a drilling safety connector. It employs a left-hand threaded connection between the first connector and the connecting body, and a right-hand threaded connection between the connecting body and the second connector, tightening the upper second connector and connecting them into a rigid body. When hands-free operation is required, a steel ball is inserted and the pump is started. The steel ball falls onto the inclined surface of the ball holder and blocks the inner hole. The drilling fluid pressure acts on the splined mandrel, generating axial thrust. When the thrust reaches a set value, it shears the pin. The splined mandrel descends and disengages from the spline pair between the first connector and the splined mandrel, allowing normal rotation of the drill string to achieve hands-free operation. However, the core component of this patent is the pin. During hands-free operation, the pump needs to be started to achieve the set thrust of the drilling fluid to shear the pin. Various factors, such as the pin's material, machining precision, the tightness of the connection with the tool connecting body, and deformation during long-term downhole operation, can cause significant deviations in the thrust value for shearing the pin, easily leading to instability during the use of the hands-free tool.

[0005] In conclusion, how to effectively solve the problem of inconvenience in detaching the two connectors is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the first objective of the present invention is to provide a safe release tool while drilling, which can effectively solve the problem of inconvenience in detaching two joints. The second objective of the present invention is to provide a safe release tool assembly while drilling that includes the above-mentioned safe release tool while drilling.

[0007] To achieve the first objective mentioned above, the present invention provides the following technical solution:

[0008] A drilling safety release tool includes a first connector, a second connector, a valve core, and an elastic buckle. The first connector and the second connector are connected by the elastic buckle in a locked position to prevent the first connector from detaching from the second connector. The valve core is provided with a through channel to connect an inlet cavity formed on the first connector and an outlet cavity formed on the second connector. A connecting channel is also formed between the inlet cavity and the outlet cavity. When the elastic buckle is in the locked position, it can block the connecting channel. The valve core and the first connector are abutted by a first elastic device to push the valve core to block the connection between the inlet cavity and the connecting channel. When the through channel is blocked by a blocking device, the valve core can be pushed by the fluid in the inlet cavity to move to the point where the inlet cavity connects with the connecting channel, and the fluid entering the connecting channel can push the elastic buckle out of the locked position.

[0009] In the aforementioned safe release tool for drilling, during normal downhole drilling, the valve core is positioned in the blocking position under the pre-tightening force of the first elastic device, thus blocking the connection between the connecting channel and the inlet chamber. At this time, the drilling fluid flows directly downwards along the connecting channel, enters the outlet chamber at the second connector, and eventually flows out of the tool. Because the drilling fluid does not flow into the connecting channel, the elastic clip remains in the locked position under the pre-tightening force of its own elastic device, preventing the first connector from disengaging from the second connector. In this state, the first connector can transmit torque and speed, as well as axial force, thereby achieving normal drilling function. When a quick and safe release is required downhole, a plug is inserted. The plug enters the connecting channel, sealing it. At this time, the pump pressure in the inlet chamber increases. Under the liquid pressure in the inlet chamber, and the liquid pressure on the plug, the valve core pushes against the elastic force of the first elastic device to move, thus no longer blocking the connection between the inlet chamber and the connecting channel. Drilling fluid can enter the connecting channel, push open the elastic clip to disengage from the locking position, allowing the second connector to detach from the first connector. In the aforementioned safe release tool for drilling, a movable valve core and a pressurized connecting channel are used. The high pressure generated after the connecting channel is blocked by a plugging ball pushes the valve core to move, allowing high-pressure fluid to flow to the elastic clip, thus disengaging the first and second connectors. The entire process is simple to operate and eliminates the need for inconvenient pins. In summary, this safe release tool for drilling effectively solves the problem of inconvenient disengagement between two connectors.

[0010] In some technical solutions, the end of the through channel near the inlet cavity forms a tapered hole that gradually expands towards the inlet cavity, and the end of the first connector inlet cavity away from the valve core forms a placement hole to accommodate the plugging component. The diameter of the inlet cavity is not less than the maximum diameter of the tapered hole.

[0011] In some technical solutions, the through channel and the center line of the inlet cavity are collinear. The valve core and the mating hole on the first connector are slidably mated along the center line of the through channel. The wall of the mating hole has a radially extending hole as the opening of the communication channel, so that the valve core can slide to block the hole to isolate the inlet cavity from the communication channel, and can slide to expose the hole to connect the inlet cavity and the communication channel.

[0012] In some technical solutions, a valve seat is also included that is fixedly connected to the first connector. A first hole segment is formed on the first connector. The valve seat is inserted into the first hole segment and is radially spaced from the first hole segment to form the communication channel. A transversely outward through-hole is provided at the position corresponding to the first hole segment on the first connector. A slot is formed on the transverse outer side of the first connector to cooperate with the elastic buckle. The slot is correspondingly provided with the through-hole so that the through-hole is blocked when the elastic buckle enters the slot.

[0013] In some technical solutions, the elastic buckle includes a locking block that slides laterally with the locking groove and a second elastic device that prevents the locking block from disengaging from the locking groove. One end of the second elastic device abuts against the locking block, and the other end abuts against the inner wall of the second connector.

[0014] In some technical solutions, along the liquid flow direction of the inlet cavity, the valve core can be inserted into the valve seat and abutted against it by the first elastic device; along the opposite direction of the liquid flow direction of the inlet cavity, the valve seat can extend into the first connector so that the valve core abuts against the inner shoulder surface of the first connector to block the hole; the valve seat and the first connector are locked together by threads.

[0015] In some technical solutions, an anti-rotation sleeve is also included, which is fixedly connected to the second connector, slides with the first connector, and restricts relative rotation between them.

[0016] In some technical solutions, a groove is formed between the inner end of the anti-rotation sleeve and the shoulder surface of the second connector to form a clearance space for the locking block. The anti-rotation sleeve extends into the second connector and is threadedly engaged with it. The anti-rotation sleeve and the first connector are engaged by a spline and a sealing ring is provided between them.

[0017] To achieve the second objective mentioned above, the present invention also provides a drilling safety release tool assembly, which includes any of the aforementioned drilling safety release tools. A plug is placed at the inlet end of the through-channel of the drilling safety release tool, and the side of the plug away from the fluid inlet direction abuts against the edge or wall of the through-channel. Since the aforementioned drilling safety release tools have the above-mentioned technical effects, the drilling safety release tool assembly having these tools should also have corresponding technical effects.

[0018] In some technical solutions, the blocking component is a sphere. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A cross-sectional structural schematic diagram of the drilling safety release tool assembly provided in an embodiment of the present invention;

[0021] Figure 2 for Figure 1 A schematic diagram of the AA section of the mid-drilling safety release tool assembly;

[0022] Figure 3 for Figure 1 Schematic diagram of the BB cross section of the drilling safety release tool assembly;

[0023] Figure 4 A schematic diagram of the external structure of the first connector provided in an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the external structure of the card block provided in an embodiment of the present invention;

[0025] Figure 6 A cross-sectional structural diagram of the drilling safety release tool provided in an embodiment of the present invention before inserting the plugging device;

[0026] Figure 7 A cross-sectional structural diagram of the drilling safety release tool after inserting the plugging component, provided in an embodiment of the present invention;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the card block after the blocking component is inserted, according to an embodiment of the present invention.

[0028] The following labels are shown in the attached diagram:

[0029] 1. First connector, 2. Sealing ring, 3. Anti-rotation sleeve, 4. Plug, 5. First elastic device, 6. Valve core, 7. Second elastic device, 8. Locking block, 9. Valve seat, 10. Second connector, 11. Tapered hole, 12. Spline, 13. Through channel, 14. Connecting channel, 15. Slot, 16. Annular groove, 17. Fitting groove, 18. Connecting hole, 19. Gap channel, 20. Hole, 21. Inlet cavity, 22. Outlet cavity. Detailed Implementation

[0030] This invention discloses a safe release tool for drilling, which can effectively solve the problem of inconvenient separation between two joints.

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figures 1-8 , Figure 1 A cross-sectional structural schematic diagram of the drilling safety release tool assembly provided in an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the AA section of the mid-drilling safety release tool assembly; Figure 3 for Figure 1 Schematic diagram of the BB cross section of the drilling safety release tool assembly; Figure 4 A schematic diagram of the external structure of the first connector provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the external structure of the card block provided in an embodiment of the present invention; Figure 6 A cross-sectional structural diagram of the drilling safety release tool provided in an embodiment of the present invention before inserting the plugging device; Figure 7 A cross-sectional structural diagram of the drilling safety release tool after inserting the plugging component, provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the cross-sectional structure of the card block after the blocking component is inserted, according to an embodiment of the present invention.

[0033] In some embodiments, a drilling safety release tool is provided, including a first connector 1, a second connector 10, a valve core 6, and a resilient buckle.

[0034] The first connector 1 and the second connector 10 are connected by an elastic latch in a snap-fit ​​position to prevent the first connector 1 from disengaging from the second connector 10. Specifically, the first connector 1 and the second connector 10 are connected in an interlocking relationship, either directly or indirectly. The elastic latch, under the action of its own elastic mechanism, enters the snap-fit ​​position to engage the first connector 1 and the second connector 10, preventing them from disengaging. When the elastic latch disengages from the snap-fit ​​position, the first connector 1 and the second connector 10 can disengage.

[0035] The valve core 6 is provided with a through channel 13 to connect the inlet chamber formed on the first connector 1 and the outlet chamber formed on the second connector 10. This allows drilling fluid to enter the inlet chamber, and then, because the through channel 13 connects the inlet and outlet chambers, the drilling fluid can enter the through channel 13 and then flow along it to the outlet chamber. The through channel 13 is a continuous channel, also known as a straight channel. As shown in the attached diagram, the through channel 13 can be a shaft hole in the middle of the valve core 6.

[0036] A connecting channel 14 is formed between the inlet and outlet chambers. When the elastic buckle is engaged, it can block the connecting channel 14. After the high-pressure liquid in the inlet chamber enters the connecting channel 14, it enters the elastic buckle. At this time, the high-pressure liquid acts on the elastic buckle to push it out of the engagement position, thereby releasing the constraint between the first connector 1 and the second connector 10.

[0037] The valve core 6 and the first connector 1 are abutted by the first elastic device 5, which pushes the valve core 6 to block the connection between the inlet cavity and the connecting channel 14, that is, the connection between the inlet cavity and the connecting channel 14 is broken. When the through channel 13 is blocked by the blocking member 4, the valve core 6 can be pushed by the liquid in the inlet cavity. Since the through channel 13 is blocked, the liquid pressure in the inlet cavity will act on the valve core 6, which can be transmitted to the valve core 6 through the blocking member 4, so as to overcome the elastic force of the first elastic device 5. Then the valve core 6 will move to overcome the elastic force of the first elastic device 5, so as to move to connect the inlet cavity and the connecting channel 14. Moreover, the liquid entering the connecting channel 14 can push the elastic buckle to disengage from the locking position. At this time, the locking relationship between the first connector 1 and the second connector 10 is released, and the first connector 1 can be disengaged from the second connector 10.

[0038] In the aforementioned safe release tool for drilling, during normal downhole drilling, the valve core 6 is positioned in the blocking position under the pre-tightening force of the first elastic device 5, thus blocking the connection between the connecting channel 14 and the inlet chamber. At this time, the drilling fluid flows directly downwards along the through channel 13, enters the outlet chamber at the second connector 10, and finally flows out of the tool. Since the drilling fluid does not flow into the connecting channel 14, the elastic clip remains in the locking position under the pre-tightening force of its own elastic device, preventing the first connector 1 from disengaging from the second connector 10. In this state, the first connector 1 can transmit torque and speed, as well as axial force, thereby achieving normal drilling function. When a quick and safe release is required downhole, the plug 4 is inserted. The plug 4 enters the through channel 13, sealing it and closing the through channel 13. At this point, the pump pressure in the inlet chamber increases. Under the pressure of the liquid in the inlet chamber, and also under the pressure of the liquid in the plugging component 4, the valve core 6 is pushed to overcome the elastic force of the first elastic device 5, moving to no longer block the connection between the inlet chamber and the connecting channel 14. Drilling fluid can then enter the connecting channel 14, pushing open the elastic buckle to disengage from the locked position, allowing the second connector 10 to disengage from the first connector 1. In the above-mentioned safe release tool for drilling, a movable valve core 6 and a through-channel 13 are used. The high pressure generated after the plugging component 4 blocks the through-channel 13 pushes the valve core to move, connecting the inlet chamber and the connecting channel. The high-pressure fluid can then move to the elastic buckle, pushing it out of the locked position, allowing the first connector 1 and the second connector 10 to disengage. The entire process is simple to operate and does not require the use of inconvenient pins. In summary, this safe release tool for drilling effectively solves the problem of inconvenient disengagement between two connectors.

[0039] In some embodiments, to facilitate the guidance of the plugging member 4 to block the through channel 13, a tapered hole 11 that gradually expands towards the inlet cavity can be formed at the end of the through channel 13 near the inlet cavity, so as to guide the plugging member 4 into the tapered hole 11 and better fit it into the tapered hole 11 to block the through channel 13. In particular, a spherical plugging member 4 is used, in which case the diameter of the plugging member 4 is smaller than the maximum diameter of the tapered hole 11.

[0040] The first connector 1 has a placement hole at the end of its inlet chamber furthest from the valve core 6, allowing the insertion of the plug 4. The diameter of the inlet chamber is not less than the maximum diameter of the tapered hole 11; specifically, they can be equal to ensure aligned boundaries. In use, the plug 4 can be inserted through the placement hole into the inlet chamber, and then from the inlet chamber into the tapered hole 11, where it abuts against the wall of the tapered hole 11 to block the through channel 13. The placement hole, inlet chamber, and tapered hole 11 can be coaxially arranged to form a cylindrical structure for better guidance of the plug 4 into the tapered hole 11.

[0041] In some embodiments, the through channel 13 can be collinear with the centerline of the inlet cavity, wherein the valve core 6 and the mating hole on the first connector 1 are slidably engaged along the centerline of the through channel 13. The mating hole has radially extending openings in its wall to serve as the passageway for the connecting channel 14, allowing the valve core 6 to slide to block the openings and isolate the inlet cavity from the connecting channel 14, and also to slide to expose the openings to allow communication between the inlet cavity and the connecting channel 14. The openings on the side walls facilitate installation.

[0042] In some embodiments, to facilitate the installation of the valve core 6, the first elastic device 5, etc., a valve seat 9 fixedly connected to the first connector 1 may also be provided, wherein a first hole is formed on the first connector 1, and the valve seat 9 is inserted into the first hole with a radial clearance to form a communication channel 14. Furthermore, an axial clearance may be provided between the end of the valve seat 9 and the end of the first hole to form the aforementioned hole. Specifically, the valve seat 9 is inserted into the first hole from the end furthest from the inlet cavity.

[0043] A transversely outward through-hole 18 is provided at the position corresponding to the first hole segment of the first connector 1. A slot 15 is formed on the transverse outer side of the first connector 1 to cooperate with the elastic buckle. The slot 15 is correspondingly provided with the through-hole 18 so that when the elastic buckle enters the slot 15, it blocks the through-hole 18, and at this time the elastic buckle enters the snap-fit ​​position.

[0044] When high-pressure fluid, i.e., drilling fluid, enters the connecting channel 14, the high-pressure fluid acts on the elastic buckle through the connecting hole 18, pushing the elastic buckle out of the slot 15 to disengage it from the engaged position. At this time, the drilling fluid can flow into the outlet cavity through the slot 15. However, if no high-pressure fluid enters the connecting channel 14, it cannot overcome the elastic force of the elastic buckle. Therefore, the elastic buckle will remain in the slot 15 under the action of the elastic force, preventing the first joint from moving.

[0045] Generally, the first connector is located at the lower end of the slot 15, and forms a gap channel 19 corresponding to the inner hole of the second connector 10. The gap channel 19 is distributed in a ring to connect the slot opening and the outlet cavity of the slot 15, so that the fluid flowing out of the slot opening of the slot 15 will enter the gap channel 19 and then enter the outlet cavity from the gap channel 19.

[0046] In some embodiments, specifically, the elastic buckle includes a locking block 8 that slides laterally with the locking groove 15 and a second elastic device 7 that prevents the locking block 8 from disengaging from the locking groove 15. One end of the second elastic device 7 abuts against the locking block 8, and the other end abuts against the inner wall of the second connector 10. Specifically, the locking block 8 may have a corresponding side provided with a mating groove 17 for one end of the second elastic device 7 to extend into. The mating groove 17 may be a circular groove or a square groove. Correspondingly, the inner wall of the second connector 10 may also form an annular groove 16 to fit the other end of the second elastic device 7. Preferably, both the first elastic device 5 and the second elastic device 7 are compression springs, such as cylindrical springs, but other elastic devices, such as elastic bodies, may also be used.

[0047] There may be only one elastic buckle, or multiple elastic buckles may be evenly arranged around the central axis of the valve core 6, such as four elastic buckles evenly arranged around the central axis of the valve core 6; or as shown in the attached figure, eight elastic buckles are evenly arranged around the central axis of the valve core 6.

[0048] In some embodiments, along the liquid flow direction of the inlet cavity, the valve core 6 can be inserted into the valve seat 9 and abutted against it by a first elastic device 5. That is, the end of the valve seat 9 near the inlet cavity has a mounting hole, the diameter of which is not less than the outer diameter of the first elastic device 5, and preferably they are fitted together, such as being equal. Specifically, the mounting hole can be a cylindrical hole with a shoulder formed at the bottom. The valve core 6 has a first column segment and a second column segment arranged coaxially, wherein the outer diameter of the first column segment is larger than the outer diameter of the second column segment to form a limiting shoulder. The second elastic device 7 is sleeved on the second column segment, with one end abutting against the shoulder at the bottom of the mounting hole and the other end abutting against the aforementioned limiting shoulder. Preferably, the diameter of the first column segment matches the mounting hole so that the first column segment enters the mounting hole and guides the valve core 6 to slide. After the valve core 6, the second elastic device 7 and the valve seat 9 are assembled, the valve seat 9 can be inserted into the first connector 1 in the opposite direction of the liquid flow direction in the inlet cavity so that the valve core 6 can abut against the inner shoulder surface of the first connector 1 to seal the hole; the valve seat 9 and the first connector 1 are locked together by threads.

[0049] Specifically, the first connector 1 can include a first hole section, a second hole section, and a third hole section arranged sequentially along the liquid flow direction of the inlet cavity. The diameter of the first hole section is smaller than the diameter of the second hole section and is equal to the diameter of the mounting hole on the valve seat 9, that is, equal to the outer diameter of the first column section, so as to match the arrangement.

[0050] One end of the valve seat 9 is inserted into the second hole section, and a gap is set between the inner wall of the second hole section and the valve seat 9, that is, the diameter of the second hole section is larger than the diameter of the corresponding section of the valve seat 9, to form a gap and a connecting channel 14. An axial gap is set between the end of the valve seat 9 and the end of the first hole section to form the aforementioned hole. The first column section of the valve core 6 can slide into the first hole section, at which point it seals the hole; after exiting the first hole section, it enters the mounting hole and no longer seals the hole. The fluid in the first connector 1 will flow radially through the hole, enter the radial gap, and then flow axially to the connecting hole 18 to push open the elastic buckle.

[0051] The third hole section has an internal thread to mate with the external thread on the valve seat 9, achieving a threaded connection. To avoid over-insertion, the connection position between the third hole section and the second hole section can have an inwardly protruding shoulder to axially limit the valve seat 9 and ensure the aforementioned axial clearance, i.e., the aforementioned hole. The connecting hole 18 can be located at one end of the second hole section near the third hole section.

[0052] In some embodiments, an anti-rotation sleeve 3 is further included, wherein the anti-rotation sleeve 3 is fixedly connected to the second connector 10, slidably engages with the first connector 1, and restricts relative rotation between them. The separately provided anti-rotation sleeve 3 facilitates installation and the installation of elastic clips.

[0053] In some embodiments, a groove can be formed between the inner end of the anti-rotation sleeve 3 and the shoulder surface of the second connector 10 to form a clearance space for the locking block 8, and to axially limit the locking block 8. That is, after the locking block 8 enters the slot 15, it is still partially located within the clearance space, so that the locking block 8 and the second connector 10 cannot move axially relative to each other, and the corresponding locking block 8 and the first connector 1 cannot move axially relative to each other, thereby preventing the first connector 1 and the second connector 10 from moving axially relative to each other and preventing them from separating. The anti-rotation sleeve 3 extends into the second connector 10 and is threaded together for easy installation. The anti-rotation sleeve 3 and the first connector 1 are engaged by a spline 12, and a sealing ring 2 is provided between them.

[0054] Furthermore, to facilitate axial force transmission between the anti-rotation sleeve 3 and the second connector 10, the anti-rotation sleeve 3, after being inserted into the second connector 10, can have a shoulder formed on its exterior to abut against the end of the second connector 10. Correspondingly, the first connector 1 can have a shoulder formed on its exterior, which abuts against the end of the anti-rotation sleeve 3 after the first connector 1 is inserted into the anti-rotation sleeve 3. Through the aforementioned abutment relationship such as the shoulder and protrusion, the first connector 1, the anti-rotation sleeve 3, and the second connector 10 can transmit force sequentially along the direction of liquid flow in the cavity.

[0055] In some embodiments, such as Figures 1-5As shown, a drilling safety release tool is provided, comprising: a first connector 1, a sealing ring 2, an anti-rotation sleeve 3, a plugging component 4, a first elastic device 5, a valve core 6, a second elastic device 7, a locking block 8, a valve seat 9, and a second connector 10.

[0056] The first connector 1 passes through the anti-rotation sleeve 3 and is inserted into the second connector 10. The first connector 1 and the anti-rotation sleeve 3 are connected by a spline 12 for transmission. Two sealing rings 2 are provided on the annular mating surface of the first connector 1 and the anti-rotation sleeve 3. The lower end of the first connector 1 is threaded to the valve seat 9. The valve core 6 and the first elastic device 5 are placed inside the first connector 1. A communication channel 14 is provided between the inside of the first connector 1 and the valve seat 9. Several slots 15 are evenly provided on the lower part of the spline 12 of the first connector 1, and the first connector 1 is engaged with the locking block 8 through the slots 15. Each slot 15 of the first connector 1 is provided with a radial hole 18 that communicates with the communication channel 14.

[0057] The upper end of the valve core 6 is provided with a tapered hole 11 that is wider at the top and narrower at the bottom. The tapered hole 11 is used to accommodate the plug 4. The upper end of the valve core 6 is inserted into the first connector 1, and the lower end of the valve core 6 is inserted into the valve seat 9. The valve core 6 moves up and down in the valve seat 9 through the first elastic device 5. The through channel 13 of the valve core 6 is connected to the central hole of the valve seat 9 and thus connects to the outlet cavity.

[0058] The outer diameter of the plug 4 is required to be smaller than the inner diameter of the upper opening of the tapered hole 11 and larger than the inner diameter of the through channel 13, so as to block the through channel 13.

[0059] The upper end of the second connector 10 is threadedly connected to the anti-rotation sleeve 3. An annular groove 16 is provided on the inner wall of the second connector 10. A second connector inner cavity 19 is provided between the second connector 10, the first connector 1, and the valve seat 9.

[0060] The outer surface of the locking block 8 is provided with a groove 17, and a second elastic device 7 is placed between the groove 17 of each locking block 8 and the annular groove 16 of the second connector 10.

[0061] The safe release tool while drilling is in use during normal downhole drilling (such as...) Figure 6As shown, the valve core 6 is inserted into the first connector 1 under the pre-tightening force of the first elastic device 5, closing the connecting channel 14. The drilling fluid flows directly downward along the through channel 13 and eventually flows out of the tool. Since the drilling fluid does not flow into the connecting channel 14, the locking block 8 is always located in the locking groove 15 under the pre-tightening force of the second elastic device 7, thereby limiting the axial movement of the first connector 1 along the spline 12 and thus playing the role of preventing detachment. In this state, the first connector 1 transmits torque and speed to the anti-rotation sleeve 3 through the spline 12. At the same time, the drilling pressure is transmitted downward through the stepped surface between the first connector 1 and the anti-rotation sleeve 3. The anti-rotation sleeve 3 then transmits the drilling pressure, torque, and speed to the second connector 10 through the mating thread, thereby realizing the normal drilling function. Since the spline 12 adopts the form of eight splines evenly distributed, with a wide contact surface and thick wall, the torsional strength fully meets the requirements of normal drilling.

[0062] When a quick and safe release is required underground (such as...) Figure 7 As shown), the plugging component 4 is inserted into the drill pipe from the wellhead, and the pump is started for circulation. When the plugging component 4 falls into the conical hole 11 of the valve core 6, the through channel 13 is closed, and the pump pressure increases. At the same time, the plugging component 4 and the valve core 6 move downward under the pressure of the drilling fluid, overcoming the pre-tightening force of the first elastic device 5, opening the connecting channel 14. The drilling fluid flows downward along the connecting channel 14 to the evenly distributed radial holes 18. Under the action of the drilling fluid jet in the radial holes 18, the clamping block 8 overcomes the pre-tightening force of the second elastic device 7, disengages from the clamping groove 15, and moves outward to the inner wall of the second connector 10 (as shown). Figure 8 As shown in the diagram, at this time, the radial hole 18 is connected to the inner cavity 19 of the second connector. The drilling fluid flows through the radial hole 18 to the inner cavity 19 of the second connector and continues to flow downward, causing the pump pressure to drop. After observing the signal of the pump pressure drop, the ground operator can determine that the locking block 8 has disengaged from the locking groove 15, the anti-disengagement function is released, and then the drill string is lifted. The first connector 1, together with the valve seat 9, valve core 6, first elastic device 5, and plug 4, moves upward along the spline 12, disengaging from the anti-rotation sleeve 3 and the second connector 10, achieving a quick and safe release.

[0063] Based on the drilling safety release tool provided in the above embodiments, the present invention also provides a drilling safety release tool assembly. This assembly includes any one of the drilling safety release tools described in the above embodiments. A plug is placed at the inlet end of the through-channel of the drilling safety release tool, and the side of the plug away from the fluid inlet direction abuts against the edge or wall of the through-channel. Since this drilling safety release tool assembly uses the drilling safety release tool described in the above embodiments, the beneficial effects of this assembly are explained in the above embodiments. The plug can be a sphere or a frustum structure.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A safe release tool for drilling operations, characterized in that, The device includes a first connector (1), a second connector (10), a valve core (6), and an elastic buckle. The first connector (1) and the second connector (10) are connected by the elastic buckle in a snap-fit ​​position to prevent the first connector (1) from disengaging from the second connector (10). The valve core (6) is provided with a through channel (13) to connect the inlet cavity formed on the first connector (1) and the outlet cavity formed on the second connector (10). A connecting channel (14) is also formed between the inlet cavity and the outlet cavity, and the elastic buckle enters the through channel (14). When in the snap-fit ​​position, the connecting channel (14) can be blocked; the valve core (6) and the first connector (1) are abutted by the first elastic device (5) to push the valve core (6) to block the inlet cavity from communicating with the connecting channel (14); when the through channel (13) is blocked by the blocking member (4), the valve core (6) can be pushed by the liquid in the inlet cavity to move to the point that the inlet cavity communicates with the connecting channel (14), and the liquid entering the connecting channel (14) can push the elastic buckle out of the snap-fit ​​position.

2. The drilling safety release tool according to claim 1, characterized in that, The through channel (13) has a tapered hole (11) that gradually expands toward the inlet cavity at one end near the inlet cavity, and a placement hole is formed at the end of the inlet cavity away from the valve core so that the plug (4) can be inserted. The diameter of the inlet cavity hole is not less than the maximum diameter of the tapered hole (11).

3. The drilling safety release tool according to claim 2, characterized in that, The through channel (13) is collinear with the center line of the inlet cavity. The valve core (6) and the mating hole on the first connector (1) are slidably mated along the center line of the through channel (13). The wall of the mating hole is provided with a radially extending hole to serve as the channel opening of the connecting channel (14), so that the valve core can slide to cover the hole to block the inlet cavity from the connecting channel (14), and can slide to expose the hole to connect the inlet cavity and the connecting channel (14).

4. The drilling safety release tool according to claim 3, characterized in that, It also includes a valve seat (9) fixedly connected to the first connector (1), a first hole segment is formed on the first connector (1), the valve seat (9) is inserted into the first hole segment and is radially spaced from the first hole segment to form the communication channel (14), and a transverse outward through communication hole (18) is opened at the position corresponding to the first hole segment of the first connector (1); a slot (15) is formed on the transverse outer side of the first connector (1) to cooperate with the elastic buckle, and the slot (15) is correspondingly arranged with the communication hole (18) so that the elastic buckle blocks the communication hole (18) when it enters the slot (15).

5. The drilling safety release tool according to claim 4, characterized in that, The elastic buckle includes a locking block (8) that slides laterally with the slot (15) and a second elastic device (7) that prevents the locking block (8) from disengaging from the slot (15). One end of the second elastic device (7) abuts against the locking block (8), and the other end abuts against the inner wall of the second connector (10).

6. The drilling safety release tool according to claim 5, characterized in that, Along the liquid flow direction of the inlet cavity, the valve core (6) can be inserted into the valve seat (9) and abutted against each other by the first elastic device (5); along the opposite direction of the liquid flow direction of the inlet cavity, the valve seat (9) can extend into the first connector (1) so that the valve core (6) abuts against the inner shoulder surface of the first connector (1) to block the hole; the valve seat (9) and the first connector (1) are locked together by threads.

7. The drilling safety release tool according to any one of claims 5-6, characterized in that, It also includes an anti-rotation sleeve (3), which is fixedly connected to the second connector (10), slides with the first connector (1), and restricts relative rotation between them.

8. The drilling safety release tool according to claim 7, characterized in that, The inner end of the anti-rotation sleeve (3) forms a groove with the shoulder surface of the second connector (10) to form the retraction space of the locking block (8). The anti-rotation sleeve (3) extends into the second connector (10) and is threadedly engaged. The anti-rotation sleeve (3) and the first connector (1) are engaged by a spline (12) and a sealing ring (2) is provided between them.

9. A drilling safety release tool assembly, characterized in that, The tool includes a drilling safety release tool as described in any one of claims 1-8, wherein a plug (4) is placed at the inlet end of the through channel (13) of the drilling safety release tool, and the side of the plug (4) away from the fluid inlet direction abuts against the edge or wall of the through channel (13).

10. The drilling safety release tool assembly according to claim 9, characterized in that, The plug (4) is a sphere.

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