A continuous circulation drilling tool

Abstract

The present invention discloses a continuous circulation drilling tool, including a continuous circulation nipple and an auxiliary device, wherein the continuous circulation nipple includes a nipple base, a plug valve, a bypass valve seat and a one-way valve; the auxiliary device includes a side insert and a pressure test assembly, one end of the side insert is used to communicate with the bypass valve seat, a pressure test hole is provided on the side insert, and the pressure test assembly includes a pressure test cylinder and a piston, the pressure test cylinder is fixedly inserted in the pressure test hole, and the piston is slidably arranged in the pressure test cylinder. The technical solution proposed by the present invention has the beneficial effect that by arranging the pressure test cylinder and the piston on the side insert, when the side insert needs to be disassembled, whether there is pressure in the side insert is determined by pushing and pulling the piston, thereby avoiding pressure operation when disassembling the side insert, thereby improving safety.

Description

Technical Field

[0001] The invention relates to mechanical equipment for oil and gas field exploitation operations, in particular to a continuous circulation drilling tool. Background Art

[0002] During drilling operations, after drilling near the drilling platform, the pump needs to be stopped to connect a new single rod or column. Frequent pumping / stopping can easily cause well kick, leakage, pipe sticking and gas invasion and other bottom hole accidents. The continuous circulation drilling system can maintain the uninterrupted circulation of drilling fluid when connecting and unloading single rods or columns, achieve a stable equivalent circulation density during drilling, and continuously discharge cuttings, effectively improving the safety of drilling operations.

[0003] The continuous circulation drilling sub is a key component of the continuous circulation drilling system. The circulation sub is connected to the column and can switch the drilling fluid between the main channel and the bypass channel. The bypass tube is the main accessory of the continuous circulation drilling system, which can assist the continuous circulation sub to establish bypass circulation.

[0004] When the existing continuous circulation short section is connected or disconnected from the bypass pipeline, it is impossible to detect whether the short section and the bypass pipeline are under pressure, and rash operation will cause great safety risks. Summary of the invention

[0005] In view of this, it is necessary to provide a continuous circulation drilling tool to solve the technical problem that before removing the bypass tube, if there is pressure in the circulation short joint and the bypass tube, the connection and removal of the bypass tube will be a pressurized operation with a high safety risk.

[0006] In order to achieve the above object, the present invention provides a continuous circulation drilling tool, comprising:

[0007] A continuous circulation nipple, comprising a nipple base, a plug valve, a bypass valve seat and a one-way valve, wherein the nipple base is provided with a bypass hole, the plug valve is arranged in the nipple base and is used to control the on-off of the nipple base, the bypass valve seat is fixed in the bypass hole, and the one-way valve is arranged in the bypass valve seat; and,

[0008] The auxiliary device includes a side insert and a pressure test assembly. One end of the side insert is used to communicate with the bypass valve seat. A pressure test hole is opened on the side insert. The pressure test assembly includes a pressure test cylinder and a piston. The pressure test cylinder is fixedly inserted in the pressure test hole, and the piston is slidably arranged in the pressure test cylinder.

[0009] In some embodiments, a mounting hole is also provided on the short joint base, and the plug valve includes an upper plug valve seat, a lower plug valve seat, a plug ball valve and a plug valve stem. The upper plug valve seat and the lower plug valve seat are fixed inside the short joint base, the lower plug valve seat sits on the shoulder of the short joint base, the plug ball valve sits on the lower plug valve seat, and a through hole is provided on the plug ball valve. The upper plug valve seat is used to limit the plug ball valve, and the upper plug valve seat is fixed by an upper plug retaining ring and a lower plug retaining ring. The plug valve stem is inserted into the mounting hole and fixedly connected to the plug ball valve.

[0010] In some embodiments, a semicircular groove is formed on the outer wall of the short section base, and the continuous circulation short section also includes a baffle, which is fixed in the semicircular groove of the short section base by a cylindrical head screw, and the baffle is pressed on the bypass valve seat.

[0011] In some embodiments, a first sealing ring is installed between the bypass valve seat and the bypass hole.

[0012] In some embodiments, a middle hole is opened in the center of the bypass valve seat, and a plurality of flow holes are also opened on the bypass valve seat. The one-way valve includes a bypass valve stem, a bypass valve plate, a locking nut and a compression spring. The bypass valve stem is slidably inserted in the middle hole, the bypass valve plate is fixed to one end of the bypass valve stem, the bypass valve plate is used for sealing connection with the bypass valve seat, the locking nut is fixed to the other end of the bypass valve stem, the compression spring is sleeved on the bypass valve stem, one end of the compression spring abuts against the bypass valve seat, and the other end of the compression spring abuts against the locking nut.

[0013] In some embodiments, an internal thread is formed on the inner wall of the bypass valve seat, and a groove is also formed on the inner wall of the bypass valve seat; the continuous circulation short section also includes a bypass valve cover, and the bypass valve cover includes a valve cover body and a locking sleeve, and an external thread matching the internal thread is formed on the outer wall of the valve cover body, and the locking sleeve is fixed to the valve cover body, and a first buckle matching the groove is formed on the locking sleeve, and the locking sleeve is connected to the bypass valve seat using the first buckle.

[0014] In some embodiments, a pressure measuring hole is provided on the valve cover body, and a sealing plug is threadedly connected to the pressure measuring hole.

[0015] In some embodiments, the bypass tube includes an inner tube, an outer tube, an outer tube handle, a locking sleeve handle, an inner tube locking sleeve and a bent joint, one end of the inner tube locking sleeve is connected to the bent joint, the inner side wall of the other end of the inner tube locking sleeve is formed with an internal thread matching the inner tube, the locking sleeve handle is fixed to the inner tube locking sleeve, the inner side wall of one end of the outer tube is formed with an internal thread matching the inner tube, the outer tube is sleeved on the inner tube through a threaded connection and abuts against the inner tube locking sleeve, the other end is formed with a second buckle matching the slot, the outer tube is connected to the bypass valve seat using the second buckle, and the pressure test hole is opened on the bent joint.

[0016] In some embodiments, a second sealing ring is provided between the elbow and the outer tube, and a third sealing ring is provided between the outer tube and the inner tube.

[0017] In some embodiments, the pressure test assembly also includes a small valve cover, a valve shaft and a small handle. The small valve cover is provided with a through hole, and the small valve cover is fixed to cover the opening of the pressure test cylinder. The valve shaft passes through the through hole and is inserted into the pressure test cylinder. The piston is fixed on the valve shaft, and the small handle is fixed to the valve shaft.

[0018] Compared with the prior art, the technical solution proposed in the present invention has the following beneficial effects: during conventional drilling, the continuous circulation short section is connected to each drill pipe, the drilling fluid maintains conventional circulation in the main channel, the plug valve remains open, and the drilling fluid circulates normally through the short section water eye and the plug valve water eye; when connecting and unloading a single root or column, in order to maintain the uninterrupted circulation of the drilling fluid, the circulation of the drilling fluid needs to be switched from the main channel to the bypass channel, at this time, one end of the bypass insert needs to be connected to the bypass valve seat, and then the drilling fluid is introduced into the other end of the bypass insert, the one-way valve is pushed open, and the drilling fluid circulation of the bypass channel is established; then the plug valve is closed, the circulation of the drilling fluid in the main channel is interrupted, and only the circulation of the drilling fluid in the bypass channel is retained. In this state, the uninterrupted circulation of the drilling fluid can be maintained, and the connecting and unloading of the single root or column can be continued; after the connecting and unloading of the single root or column is completed, the circulation of the drilling fluid needs to be switched back to the main channel. At this time, open the stopcock, establish the circulation of drilling fluid in the main channel, disconnect the circulation of drilling fluid in the side channel, and under the action of the pressure of the main channel, the one-way valve is closed, which can effectively prevent the drilling fluid from overflowing when circulating in the main channel. Push and pull the piston again. If the piston can be pushed and pulled normally, it means that there is no pressure in the side tube and it can be operated safely. At this time, pull out the side tube and return to the normal drilling state, and then continue drilling in the main channel circulation state. The technical solution provided by the present invention, by arranging a pressure test cylinder and a piston on the side tube, when it is necessary to remove the side tube, it is judged whether there is pressure in the side tube by pushing and pulling the piston, thereby avoiding pressure operation when removing the side tube, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1It is a structural schematic diagram of an embodiment of the continuous circulation drilling tool provided by the present invention when the plug valve is in a closed state and the auxiliary device is connected to the continuous circulation nipple;

[0020] Figure 2 yes Figure 1 The continuous circulation short section only retains the structural schematic diagram of the main channel circulation state;

[0021] Figure 3 yes Figure 2 A partial enlarged view of the middle area A;

[0022] Figure 4 yes Figure 2 Sectional view of the middle section BB;

[0023] Figure 5 yes Figure 4 A partial enlarged view of the middle area C;

[0024] Figure 6 yes Figure 1 A schematic diagram of the structure of the auxiliary device in FIG.

[0025] Figure 7 yes Figure 6 A partial enlarged view of the middle area D;

[0026] In the figure: 1-continuous circulation short section, 11-short section base, 12-plug valve, 121-plug upper valve seat, 122-plug lower valve seat, 123-plug ball valve, 1231-through hole, 124-plug valve stem, 125-plug upper clamping ring, 126-plug lower clamping ring, 13-bypass valve seat, 131-first sealing ring, 133-flow hole, 14-check valve, 141-bypass valve stem, 142-bypass valve plate, 143-locking nut, 144-compression spring, 15-baffle, 151-cylinder head screw, 16-bypass valve cover, 1 61-valve cover body, 1611-pressure measuring hole, 1612-sealing plug, 162-locking sleeve, 1621-first buckle, 2-auxiliary device, 21-side insert, 211-elbow joint, 2111-second sealing ring, 212-outer tube, 2121-second buckle, 213-inner tube, 2131-third sealing ring, 214-outer tube handle, 215-inner tube locking sleeve, 216-locking sleeve handle, 22-pressure test assembly, 221-pressure test cylinder, 222-piston, 223-small valve cover, 224-valve shaft, 225-small handle. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0028] Please refer to Figure 1-Figure 7 , the present invention provides a continuous circulation drilling tool, including a continuous circulation sub 1 and an auxiliary device 2;

[0029] The continuous circulation pup joint 1 comprises a pup joint base 11, a plug valve 12, a bypass valve seat 13 and a one-way valve 14. A bypass hole is provided on the pup joint base 11. The plug valve 12 is arranged in the pup joint base 11 and is used to control the on-off of the pup joint base 11. The bypass valve seat 13 is fixed in the bypass hole. The one-way valve 14 is arranged in the bypass valve seat 13.

[0030] The auxiliary device 2 includes a side insert tube 21 and a pressure test assembly 22. One end of the side insert tube 21 is used to communicate with the bypass valve seat 13. A pressure test hole is opened on the side insert tube 21. The pressure test assembly 22 includes a pressure test cylinder 221 and a piston 222. The pressure test cylinder 221 is fixedly inserted in the pressure test hole, and the piston 222 is slidably set in the pressure test cylinder 221.

[0031] During conventional drilling, the continuous circulation sub 1 is connected to each drill pipe, and the drilling fluid maintains normal circulation in the main channel. In this case, the state of the continuous circulation sub is as follows: Figure 2 As shown, the plug valve 12 remains open, and the drilling fluid circulates normally through the short joint water eye and the plug valve water eye; when connecting or disconnecting a single root or column, in order to maintain the uninterrupted circulation of the drilling fluid, the circulation of the drilling fluid needs to be switched from the main channel to the bypass channel. At this time, one end of the bypass insert 21 needs to be connected to the bypass valve seat 13, and then the drilling fluid is introduced into the other end of the bypass insert 21. The one-way valve 14 is pushed open, and the drilling fluid circulation of the bypass channel is established; then the plug valve 12 is closed, the circulation of the drilling fluid in the main channel is interrupted, and only the circulation of the drilling fluid in the bypass channel is retained. In this case, the state of the continuous circulation short joint and the bypass insert is as shown in FIG. Figure 1 As shown, this state can not only maintain the uninterrupted circulation of the drilling fluid, but also continue to complete the connection and unloading of a single root or column; after the connection and unloading of a single root or column is completed, the circulation of the drilling fluid needs to be switched back to the main channel. At this time, open the stopcock 12, the circulation of the drilling fluid in the main channel is established, and the circulation of the drilling fluid in the bypass channel is disconnected. Under the action of the main channel pressure, the one-way valve 14 is closed, which can effectively prevent the drilling fluid from overflowing when circulating in the main channel. Push and pull the piston 222 again. If the piston 222 can be pushed and pulled normally, it means that there is no pressure in the bypass tube 21 and it can be operated safely. At this time, pull out the bypass tube 21 and restore to Figure 2 state, you can continue drilling in the main channel circulation state.

[0032] The technical solution provided by the present invention is to set a pressure test cylinder 221 and a piston 222 on the side tube 21. When the side tube 21 needs to be removed, it is determined whether there is pressure in the side tube 21 by pushing and pulling the piston 222, thereby avoiding pressurized operation when removing the side tube and improving safety.

[0033] In order to realize the function of the plug valve 12, please refer to Figure 4 and Figure 5 In a preferred embodiment, the short joint base 11 is further provided with a mounting hole, the plug valve 12 comprises a plug upper valve seat 121, a plug lower valve seat 122, a plug ball valve 123 and a plug valve stem 124, the plug upper valve seat 121 and the plug lower valve seat 122 are fixed inside the short joint base 11, the plug lower valve seat 122 sits on the shoulder of the short joint base 11, the plug ball valve 123 sits on the plug lower valve seat 122, and the plug ball valve 123 is provided with a through hole 1231 The upper valve seat 121 of the plug is used to limit the plug ball valve 123. The upper valve seat 121 of the plug is fixed by the upper plug clamping ring 125 and the lower plug clamping ring 126. The plug valve stem 124 is inserted into the mounting hole and fixedly connected to the plug ball valve 123. When in use, the plug valve stem 124 is rotated to drive the plug ball valve 123 to rotate, so that the through hole 1231 of the plug ball valve 123 is connected or staggered with the center hole of the short section base 11 to realize the function of the plug valve 12.

[0034] In order to specifically implement the fixing of the bypass valve seat 13 in the bypass hole, please refer to Figure 2 and Figure 3 In a preferred embodiment, a semicircular groove is formed on the outer side wall of the short section base 11, and the continuous circulation short section 1 also includes a baffle 15, which is fixed in the semicircular groove of the short section base 11 by a cylindrical head screw 151, and the baffle 15 is pressed on the bypass valve seat 13, so as to fix the baffle 15.

[0035] To improve the sealing performance between the bypass valve seat 13 and the bypass hole, please refer to Figure 2 and Figure 3 In a preferred embodiment, a first sealing ring 131 is installed between the bypass valve seat 13 and the bypass hole.

[0036] In order to realize the function of the one-way valve 14, please refer to Figure 2 and Figure 3In a preferred embodiment, a middle hole is provided at the center of the bypass valve seat 13, and a plurality of flow holes 133 are also provided on the bypass valve seat 13. The one-way valve 14 comprises a bypass valve stem 141, a bypass valve disc 142, a locking nut 143 and a compression spring 144. The bypass valve stem 141 is slidably inserted in the middle hole, the bypass valve disc 142 is fixed to one end of the bypass valve stem 141, the bypass valve disc 142 is used for sealing connection with the bypass valve seat 13, the locking nut 143 is fixed to the other end of the bypass valve stem 141, the compression spring 144 is sleeved on the bypass valve stem 141, one end of the compression spring 144 abuts against the bypass valve seat 13, and the other end of the compression spring 144 abuts against the locking nut 143. When in use, the compression spring 144 is in a compressed state and pushes the bypass valve stem 141 to move outward, so that the bypass valve plate 142 is tightly abutted against the bypass valve seat 13 to achieve metal sealing. When drilling fluid is injected into the bypass hole, the drilling fluid pushes the compression spring 144, thereby separating the bypass valve plate 142 from the bypass valve seat 13, and the drilling fluid enters the short section base 11 through the flow hole 133.

[0037] To close the bypass hole when not in use, refer to Figure 2 and Figure 3 In a preferred embodiment, an internal thread is formed on the inner side wall of the bypass valve seat 13, and a card groove is also formed on the inner side wall of the bypass valve seat 13; the continuous circulation short section 1 also includes a bypass valve cover 16, and the bypass valve cover 16 includes a valve cover body 161 and a locking sleeve 162. The outer side wall of the valve cover body 161 is formed with an external thread matching the internal thread, and the locking sleeve 162 is fixed to the valve cover body 161. The locking sleeve 162 is formed with a card groove The first buckle 1621 is matched, and the locking sleeve 162 is connected to the bypass valve seat 13 using the first buckle 1621. When the bypass hole needs to be closed, the locking sleeve 162 and the valve cover body 161 are pushed into the bypass valve seat 13, and the valve cover body 161 is rotated clockwise, the valve cover body 161 moves downward and contacts the bypass valve seat 13, and the locking sleeve 162 is pushed to mechanically lock the bypass valve seat 13. After locking, the sealing part set at the bottom of the valve cover body 161 is in close contact with the bypass valve seat 13 to achieve effective sealing. If the bypass valve cover 16 needs to be removed, just rotate the valve cover body 161 counterclockwise, the valve cover body 161 moves upward, and the sealing part set at the bottom of the valve cover body 161 is disengaged from the bypass valve seat 13, and the mechanical locking of the locking sleeve 162 and the bypass valve seat 13 is released.

[0038] To check whether there is pressure in the bypass valve cover 16 before removing it, refer to Figure 2 and Figure 3In a preferred embodiment, a pressure measuring hole 1611 is provided on the valve cover body 161, and a sealing plug 1612 is threadedly connected to the pressure measuring hole 1611. Before removing the bypass valve cover 16, use a tool to loosen the sealing plug 1612 and observe whether there is liquid leakage. If there is no liquid leakage, it means that there is no pressure in the sealing space between the bypass valve cover 16 and the bypass valve seat 13, and the operation is safe.

[0039] In order to realize the function of the side cannula 21, please refer to Figure 1 and Figure 6 In a preferred embodiment, the bypass tube 21 includes an inner tube 213, an outer tube 212, an outer tube handle 214, an inner tube locking sleeve 215, a locking sleeve handle 216 and a bend joint 211, one end of the inner tube locking sleeve 215 is connected to the bend joint 211, the inner side wall of the other end of the inner tube locking sleeve 215 is formed with an internal thread matching the inner tube 213, the locking sleeve handle 216 is fixed to the inner tube locking sleeve 215, the inner side wall of one end of the outer tube 212 is formed with an internal thread matching the inner tube 213, the outer tube 212 is sleeved on the inner tube 213 through a threaded connection, and abuts against the inner tube locking sleeve 215, and the other end is formed with a second buckle 2121 matching the slot, the outer tube 212 is connected to the bypass valve seat 13 using the second buckle 2121, and the pressure test hole is opened on the bend joint 211. When in use, insert the outer tube 212 into the bypass valve seat 13, rotate the outer tube 212 clockwise to ensure that the second buckle 2121 is in full contact with the groove of the bypass valve seat 13, rotate the inner tube 213 clockwise to mechanically lock the second buckle 2121, thereby achieving the connection between the bypass tube 21 and the bypass valve seat 13.

[0040] In order to improve the sealing performance of the connection between the elbow 211, the outer tube 212 and the inner tube 213, please refer to Figure 1 , Figure 6 and Figure 7 In a preferred embodiment, a second sealing ring 2111 is provided between the elbow 211 and the outer tube 212 , and a third sealing ring 2131 is provided between the outer tube 212 and the inner tube 213 .

[0041] To improve the stability of the pressure test assembly 22, please refer to Figure 2 and Figure 3In a preferred embodiment, the pressure test assembly 22 also includes a small valve cover 223, a valve shaft 224 and a small handle 225. The small valve cover 223 is provided with a through hole, and the small valve cover 223 is fixed to cover the opening of the pressure test cylinder 221. The valve shaft 224 passes through the through hole and is inserted into the pressure test cylinder 221. The piston 222 is fixed on the valve shaft 224, and the small handle 225 is fixed on the valve shaft 224. When in use, the piston 222 can be pushed and pulled by pushing and pulling the small handle 225, thereby performing a pressure test.

[0042] In order to better understand the present invention, the following Figure 1-Figure 7 The working process of the continuous circulation drilling tool provided by the present invention is described in detail:

[0043] When using the continuous circulation drilling system for conventional drilling, the continuous circulation sub 1 is connected to each drill pipe, and the drilling fluid maintains conventional circulation in the main channel. In this case, the state of the continuous circulation sub is as follows: Figure 2 As shown, the plug valve 12 remains open, and the drilling fluid circulates normally through the short joint water eye and the plug valve water eye;

[0044] When connecting or disconnecting a single rod or column, in order to maintain the uninterrupted circulation of the drilling fluid, the circulation of the drilling fluid needs to be switched from the main channel to the bypass channel. At this time, the valve cover body 161 and the locking sleeve 162 need to be disassembled; before disassembling the valve cover body 161 and the locking sleeve 162, use a tool to loosen the sealing plug 1612 and observe whether there is liquid leakage. If there is no liquid leakage, it means that there is no pressure in the sealing space between the valve cover body 161 and the bypass valve seat 13, and the operation is safe. After disassembling the bypass valve cover 16, insert the outer tube 212 into the bypass valve seat 13 and turn it clockwise. The outer tube 212 is rotated to ensure that the second buckle 2121 is in full contact with the groove of the bypass valve seat 13, and the inner tube 213 is rotated clockwise to mechanically lock the second buckle 2121, thereby realizing the connection between the bypass tube 21 and the bypass valve seat 13. The drilling fluid is introduced into the inner tube 213, the bypass valve plate 142 is pushed open, and the bypass channel drilling fluid circulation is established; the plug valve stem 124 is turned to close the plug valve 12, the main channel drilling fluid circulation is interrupted, and only the bypass channel drilling fluid circulation is retained. In this case, the continuous circulation short section and the bypass tube state are as follows: Figure 1 It is shown that this state can not only maintain the uninterrupted circulation of drilling fluid, but also continue to complete the connection and disconnection of single rods or columns;

[0045] After the single pipe or column is connected and unloaded, the circulation of the drilling fluid needs to be switched back to the main channel. At this time, the plug valve stem 124 is rotated to open the plug valve 12, the circulation of the drilling fluid in the main channel is established, and the circulation of the drilling fluid in the bypass channel is disconnected. Under the dual push of the main channel pressure and the compression spring 144, the bypass valve plate 142 is tightly fitted with the bypass valve seat 13 again, which can effectively prevent the drilling fluid from overflowing when circulating in the main channel. Push and pull the small handle 225 of the pressure test assembly 22. If it can be pushed and pulled normally, it means that there is no pressure in the bypass tube 21 and it can be operated safely. At this time, rotate the inner tube 213 counterclockwise to loosen the buckle, and then rotate the outer tube handle 214 counterclockwise to confirm that the second buckle 2121 of the outer tube 212 is no longer in contact with the bypass valve seat 13, pull out the bypass tube 21, reinstall the bypass valve cover 16, and restore to Figure 2 state, you can continue drilling in the main channel circulation state.

[0046] The technical solution provided by the present invention has the following advantages:

[0047] (1) A baffle 15 is installed outside the bypass valve seat 13 to mechanically limit the bypass valve seat 13 to prevent the bypass valve seat 13 from rotating or loosening after entering the well, and to prevent the bypass valve seat 13 from falling into the well; the baffle 15 is fastened with double screws, which is safe and reliable;

[0048] (2) The connection method between the bypass valve seat 13 and the bypass valve cover 16 and the bypass tube 21 is innovated, and the traditional threaded connection is changed to a snap connection. When the bypass valve seat 13 and the bypass tube 21 are connected or disconnected in the traditional way, it is necessary to tighten or loosen the threaded connection, which is time-consuming and labor-intensive. The sealing thread is very easy to be damaged, resulting in connection failure. In comparison, the snap connection is more convenient and quick.

[0049] (3) A sealing plug 1612 is added to the bypass valve cover 16. Before removing the bypass valve cover 16, the sealing plug 1612 can be loosened to detect in advance whether there is pressure in the bypass valve cover 16, thereby ensuring the safety of removing the valve cover;

[0050] (4) The side insert tube 21 is equipped with a pressure test assembly 22. Before removing the side insert tube 21, the small handle 225 can be pushed or pulled to determine whether there is pressure in the side insert tube 21, thereby avoiding pressure-related operation when removing the side insert tube 21 and improving the safety of the tool.

[0051] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A continuous circulation drilling tool, characterized in that: include: A continuous circulation nipple, comprising a nipple base, a plug valve, a bypass valve seat and a one-way valve, wherein the nipple base is provided with a bypass hole, the plug valve is arranged in the nipple base and is used to control the on-off of the nipple base, the bypass valve seat is fixed in the bypass hole, and the one-way valve is arranged in the bypass valve seat; and, The auxiliary device comprises a bypass insert and a pressure test assembly, wherein one end of the bypass insert is used to communicate with the bypass valve seat, a pressure test hole is provided on the bypass insert, and the pressure test assembly comprises a pressure test cylinder and a piston, the pressure test cylinder is fixedly inserted in the pressure test hole, and the piston is slidably arranged in the pressure test cylinder; A middle hole is provided at the center of the bypass valve seat, and a plurality of flow holes are also provided on the bypass valve seat. The one-way valve comprises a bypass valve stem, a bypass valve disc, a locking nut and a compression spring. The bypass valve stem is slidably inserted in the middle hole, the bypass valve disc is fixed to one end of the bypass valve stem, the bypass valve disc is used for sealing connection with the bypass valve seat, the locking nut is fixed to the other end of the bypass valve stem, the compression spring is sleeved on the bypass valve stem, one end of the compression spring abuts against the bypass valve seat, and the other end of the compression spring abuts against the locking nut; A clamping groove is also formed on the inner side wall of the bypass valve seat; The bypass tube includes an inner tube, an outer tube, an outer tube handle, a locking sleeve handle, an inner tube locking sleeve and a bent joint. One end of the inner tube locking sleeve is connected to the bent joint, and the inner side wall of the other end of the inner tube locking sleeve is formed with an internal thread matching the inner tube. The locking sleeve handle is fixed to the inner tube locking sleeve, and the inner side wall of one end of the outer tube is formed with an internal thread matching the inner tube. The outer tube is sleeved on the inner tube through a threaded connection and abuts against the inner tube locking sleeve. A second buckle matching the groove is formed at the other end. The outer tube is connected to the bypass valve seat using the second buckle, and the pressure test hole is opened on the bent joint.

2. The continuous circulation drilling tool according to claim 1, characterized in that: The short joint base is also provided with a mounting hole, and the plug valve comprises an upper plug valve seat, a lower plug valve seat, a plug ball valve and a plug valve stem, the upper plug valve seat and the lower plug valve seat are fixed inside the short joint base, the lower plug valve seat sits on the shoulder of the short joint base, the plug ball valve sits on the lower plug valve seat, a through hole is provided on the plug ball valve, the upper plug valve seat is used to limit the plug ball valve, the upper plug valve seat is fixed by an upper plug retaining ring and a lower plug retaining ring, and the plug valve stem is inserted into the mounting hole and fixedly connected to the plug ball valve.

3. The continuous circulation drilling tool according to claim 1, characterized in that: A semicircular groove is formed on the outer side wall of the short section base. The continuous circulation drilling short section also includes a baffle, which is fixed in the semicircular groove of the short section base by a cylindrical head screw, and the baffle is pressed on the bypass valve seat.

4. The continuous circulation drilling tool according to claim 1, characterized in that: A first sealing ring is arranged between the bypass valve seat and the bypass hole.

5. The continuous circulation drilling tool according to claim 1, characterized in that: An external thread is formed on the outer wall of the bypass valve seat; the continuous circulation short section also includes a bypass valve cover, and the bypass valve cover includes a valve cover body and a locking sleeve. An external thread matching the locking sleeve is formed on the outer wall of the valve cover body, and the locking sleeve is fixed to the valve cover body. A first buckle matching the slot is formed on the locking sleeve, and the locking sleeve is connected to the bypass valve seat using the first buckle.

6. The continuous circulation drilling tool according to claim 5, characterized in that: The valve cover body is provided with a pressure measuring hole, and the inner thread of the pressure measuring hole is connected with a sealing plug.

7. The continuous circulation drilling tool according to claim 1, characterized in that: A second sealing ring is arranged between the elbow and the outer tube, and a third sealing ring is arranged between the outer tube and the inner tube.

8. The continuous circulation drilling tool according to claim 1, characterized in that: The pressure test assembly also includes a small valve cover, a valve shaft and a small handle. The small valve cover is provided with a through hole, and the small valve cover is fixed to cover the opening of the pressure test cylinder. The valve shaft passes through the through hole and is inserted into the pressure test cylinder. The piston is fixed on the valve shaft, and the small handle is fixed to the valve shaft.

Images