Multifunctional ball and plug throwing nipple

Abstract

The multifunctional ball and plug throwing short section comprises a ball throwing body, an upper connector and a plug blocking valve, the upper connector is in threaded connection with the ball throwing body, a main channel and an auxiliary channel are formed in the ball throwing body, the plug blocking valve is rotationally located in a rotating groove formed in the middle of the ball throwing body, and double through holes are formed in the axial middle of the plug blocking valve; the double through holes correspond to the main channel and the auxiliary channel in position, the penetrating direction of the main through hole and the penetrating direction of the auxiliary through hole are in a vertically-crossed plane, the ball or the rubber plug is placed in the main channel, in the initial state, the main channel and the main through hole are staggered, the ball or the rubber plug cannot move downwards, and circulating slurry passes through the auxiliary channel and the auxiliary through hole which are unblocked on one side. When a ball or a rubber plug needs to be thrown, the plug blocking valve is rotated to enable the main channel and the main through hole to be unblocked mutually, and the ball or the rubber plug moves downwards from the main channel, the problem that a top drive needs to be detached when the ball or the rubber plug is thrown during well drilling coring is solved, manpower is greatly saved, well drilling timeliness and safety are improved, the structure is simple and reliable, and operation is flexible.

Description

Technical Field

[0001] This invention relates to the field of auxiliary technology for drilling coring operations, specifically a multifunctional ball-throwing and plug-throwing short section. Background Technology

[0002] Currently, in actual operations, the method of dropping balls or rubber plugs into the drill string is generally to remove the top drive. However, this traditional method of dropping balls and plugs results in discontinuous operations, which is not only time-consuming and labor-intensive, but also carries the risk of mud spraying out from inside the drill string during the removal of the top drive, polluting the environment and posing risks to operations, wellhead, and stuck drill. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention discloses a multifunctional ball-throwing and plug-throwing section to solve the problems of safety and environmental risks and slow operation in existing technologies.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multifunctional ball-throwing and plug-throwing short section, comprising a ball-throwing body, an upper connector, and a plug valve. The upper connector is located at the upper end of the ball-throwing body, and its upper end is connected to a top drive. The lower end of the upper connector is threadedly connected to the upper end of the ball-throwing body, and the two are sealed by a first O-ring. The lower end of the ball-throwing body is connected to a drill string. The ball-throwing body has a dual channel inside, including a main channel and a secondary channel. The main channel is located in the middle of the ball-throwing body, and the secondary channel is located on one side of the main channel. A rotating groove is provided in the middle of the ball-throwing body, and the plug valve rotates within the groove. Inside the rotating groove, and in the axial center of the stop valve, there is a double through hole, including a main through hole and a secondary through hole. The double through holes correspond to the positions of the main channel and the secondary channel, respectively, and the through directions of the main through hole and the secondary through hole are in a perpendicular intersecting plane. A ball or rubber plug is placed inside the main channel. In the initial state, the main channel and the main through hole are misaligned, and the ball or rubber plug cannot descend. The circulating mud passes through the secondary channel and the secondary through hole on one side, which are unobstructed. When it is necessary to add a ball or rubber plug, the stop valve is rotated to make the main channel and the main through hole unobstructed, and the secondary channel and the secondary through hole on one side are misaligned and closed, allowing the ball or rubber plug to descend from the main channel.

[0005] Preferably, the upper connector is provided with a stop sleeve, which is located above the ball or rubber plug placed inside the main channel, and when the lower pressure is greater than the upper pressure, the stop sleeve prevents the ball or rubber plug from moving upward.

[0006] Preferably, an end cap is provided on the outer side of the rotating groove on the wall of the ball-throwing body. The four corners of the end cap are connected to the outer wall of the ball-throwing body by second screws. A stopper cap is provided on the inner side of the end cap. The stopper cap is located between the end cap and the stopper valve and is fitted onto the stopper valve. Sealing rings are provided at both ends of the stopper valve. The inner wall of the stopper cap is sealed to one end of the stopper valve by the sealing ring. The other end of the stopper valve is also sealed to the ball-throwing body by a sealing ring. The outer wall of the stopper cap is sealed to the ball-throwing body by a second O-ring.

[0007] Preferably, the stop valve is provided with a handwheel on the outside of the ball-throwing body, and a square shaft is provided at one end of the stop valve near the end cover. The handwheel and the square shaft are fixedly connected by a second screw and a washer. The stop valve is rotated synchronously by rotating the handwheel.

[0008] Preferably, a limiting block is provided between the handwheel and the end cover. The limiting block has a square hole in its center and is fitted onto a square shaft at one end of the stop valve. The limiting block has a limiting groove that cooperates with a limiting screw on the end cover to restrict the handwheel to rotate only 90 degrees in both directions. The handwheel has a safety screw. By adjusting the safety screw, the rotation between the handwheel and the end cover is restricted. When the safety screw is screwed outward, the front end of the safety screw disengages from the inside of the end cover, and the handwheel can rotate. Conversely, when the safety screw is screwed inward, the handwheel and the end cover cannot rotate due to the restriction of the safety screw.

[0009] Preferably, torque blocks are provided on both sides of the outer wall of the upper end of the ball-throwing body and the upper connector connection part. The torque blocks are located in the torque grooves provided on both sides of the outer wall of the ball-throwing body and the upper connector connection part. The torque blocks are fixed to the ball-throwing body by a third screw.

[0010] Preferably, a protective ring is provided around the torque block, the protective ring wraps around the outside of the torque block, and the protective ring is fixedly connected to the torque block by a fourth screw.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: By connecting the ball-dropping and plug-dropping short section of the present invention between the top drive and the upper part of the drill string, the ball or plug can be dropped into the tubing by simply rotating the handwheel 90 degrees during ball dropping, eliminating the need to unload the top drive for ball dropping or plug dropping, thus achieving continuous operation and improving drilling efficiency and safety. At the same time, it overcomes the disadvantages of traditional ball dropping methods being time-consuming and labor-intensive, as well as the problem of mud spraying out of the drill string and polluting the environment when unloading the top drive. It is not only simple and reliable in structure and flexible in operation, but also greatly saves manpower and drilling time, and avoids operational risks, wellhead risks and stuck pipe risks. Attached Figure Description

[0012] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0013] In the attached diagram:

[0014] Figure 1 This is a main cross-sectional view of the multifunctional ball-throwing and plug-throwing short section of the present invention;

[0015] Figure 2 This is the present invention. Figure 1 Enlarged structural diagram at point A;

[0016] Figure 3 This is a schematic diagram of the structure of the stop valve of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of the limiting block of the present invention;

[0018] The following are the labels in the diagram: 1. Upper connector; 2. Stop sleeve; 3. Torque block; 4. Fourth screw; 5. Protective ring; 6. Ball thrower; 7. Stop valve; 8. End cap; 801. First screw; 9. Limit block; 10. Handwheel; 11. Safety screw; 12. Washer; 13. Stop valve cap; 14. Sealing ring; 15. First O-ring; 16. Second O-ring; 17. Second screw; 18. Third screw; 19. Limit screw; 20. Limit groove. Detailed Implementation

[0019] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0020] Example: Figures 1-4As shown, a multi-functional ball-throwing and plug-throwing short section includes a ball-throwing body 6, an upper connector 1, and a stop valve 7. The upper connector 1 is located at the upper end of the ball-throwing body 6, and its upper end is connected to the top drive. The lower end of the upper connector 1 is threadedly connected to the upper end of the ball-throwing body 6, and the two are sealed by a first O-ring 15. The lower end of the ball-throwing body 6 is connected to the drill rod column. The ball-throwing body 6 has a double channel inside, including a main channel and a secondary channel. The main channel is located in the middle of the ball-throwing body 6. A stop sleeve 2 is provided inside the upper connector 1. The stop sleeve 2 is located above the ball or rubber plug placed inside the main channel, and when a stop valve is triggered... When the pressure at the bottom is greater than the pressure at the top, the stop sleeve 2 prevents the ball or rubber stopper from moving upward. The secondary channel is located on one side of the main channel. The middle of the ball-throwing body 6 is provided with a rotating groove. The stop valve 7 is rotatably located inside the rotating groove. The stop valve 7 is provided with a square shaft at one end of the end cover 8. A handwheel 10 is provided on the square shaft. The handwheel 10 and the square shaft on the stop valve 7 are fixedly connected by a second screw 17 and a washer 12. Rotating the handwheel 10 synchronously rotates the stop valve 7. An end cover 8 is provided on the outer side of the rotating groove on the wall of the ball-throwing body 6. During installation, the indicator groove on the end cover 8 is aligned with the stop valve end. The directions of the positioning grooves are consistent. The four corners of the end cap 8 are connected to the outer wall of the ball-throwing body 6 by first screws 801. A stopper cap 13 is provided on the inner side of the end cap 8. The stopper cap 13 is located between the end cap 8 and the stopper valve 7, and the end cap 8 and the stopper cap 13 are sequentially fitted onto the stopper valve 7. Sealing rings 14 are provided at both ends of the stopper valve 7. The inner wall of the stopper cap 13 is sealed to one end of the stopper valve 7 by the sealing ring 14. The other end of the stopper valve 7 is also sealed to the ball-throwing body 6 by a sealing ring 14. The outer wall of the stopper cap 13 is sealed to the ball-throwing body 6 by a sealing ring 14. Some O-rings 16 are used for sealing, and the stop valve 7 has a double through hole in the middle, including a main through hole and a secondary through hole. The double through holes correspond to the positions of the main channel and the secondary channel, and the through directions of the main through hole and the secondary through hole are in a perpendicular intersecting plane. The ball or rubber plug is placed inside the main channel. In the initial state, the main channel and the main through hole are misaligned, and the ball or rubber plug cannot go down. The circulating mud passes through the secondary channel and the secondary through hole on one side. When it is necessary to put the ball or rubber plug in, the stop valve 7 is rotated to make the main channel and the main through hole open to each other, and the secondary channel and the secondary through hole on one side are misaligned and closed, and the ball or rubber plug goes down in the main channel.

[0021] Among them, such as Figure 4As shown, a limiting block 9 is provided between the handwheel 10 and the end cover 8. The limiting block 9 has a square hole in its center, which is fitted onto a square shaft at one end of the stop valve 7. During installation, the position groove of the limiting block 9 is aligned with the position groove at the end of the stop valve. The limiting block 9 has a limiting groove 20. Under the action of the limiting screw 19 on the end cover 8, it can only rotate 90 degrees in both directions. The handwheel 10 is provided with a safety screw 11. By adjusting the safety screw 11, the rotation between the handwheel 10 and the end cover 8 is restricted. When the safety screw 11 is screwed outward, the front end of the safety screw 11 disengages from the inside of the end cover 8, and the handwheel 10 can rotate. Conversely, the handwheel 10 and the end cover 8 cannot rotate under the restriction of the safety screw 11.

[0022] Torque blocks 3 are provided on both sides of the outer wall of the connection between the ball-throwing body 6 and the upper connector 1. The torque blocks 3 are located in the torque grooves provided on both sides of the outer wall of the connection between the ball-throwing body 6 and the upper connector 1. The torque blocks 3 are fixedly connected to the torque grooves by a third screw 18. A protective ring 5 is provided around the torque blocks 3. The protective ring 5 wraps around the outside of the torque blocks 3 and the upper connector 1, and the protective ring 5 is fixedly connected to the torque blocks 3 by a fourth screw 4.

[0023] In practical use:

[0024] 1) First check if the stop valve 7 is in the closed position. If not, rotate the stop valve 7 to the closed position. Then remove the stop sleeve 2, insert a steel ball or rubber stopper, and then reinstall the stop sleeve 2.

[0025] 2) Connect the upper part of the upper connector 1 to the top drive, and the lower part of the ball 6 to the drill rod column;

[0026] 3) During mud circulation, the main channel is closed, and the mud flows into the drill string through the secondary channel. When the lower pressure exceeds the upper pressure, the ball or rubber plug may move upwards. In this case, it must not move upwards under the action of the stop sleeve 2.

[0027] 4) When throwing the ball or the stopper, loosen the safety screw 11, and then rotate the handwheel 10 counterclockwise by 90 degrees. At this time, the main channel opens and the secondary channel closes, and the ball or stopper moves downward.

[0028] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-functional ball and pin short sub, characterized by: The system includes a ball-throwing body, an upper connector, and a stop valve. The upper connector is located at the upper end of the ball-throwing body and is connected to the top drive at its upper end. The lower end of the upper connector is threaded to the upper end of the ball-throwing body, and the two are sealed by a first O-ring. The lower end of the ball-throwing body is connected to the drill string. The ball-throwing body has a dual channel inside, including a main channel and a secondary channel. The main channel is located in the middle of the ball-throwing body, and the secondary channel is located to one side of the main channel. A rotating groove is provided in the middle of the ball-throwing body, and the stop valve rotates within the rotating groove, with the stop valve axially... The middle section has two through holes, including a main through hole and a secondary through hole. The two through holes correspond to the positions of the main channel and the secondary channel, respectively, and the through directions of the main through hole and the secondary through hole are in a perpendicular intersecting plane. A ball or rubber plug is placed inside the main channel. In the initial state, the main channel and the main through hole are misaligned, and the ball or rubber plug cannot descend. The circulating mud passes through the secondary channel and the secondary through hole on one side, which are unobstructed. When it is necessary to insert a ball or rubber plug, the stop valve is rotated to make the main channel and the main through hole unobstructed, and the secondary channel and the secondary through hole on one side are misaligned and closed, allowing the ball or rubber plug to descend from inside the main channel.

2. The multi-functional ball and pin short sub of claim 1, wherein: The upper connector is equipped with a stop sleeve, which is located above the ball or rubber plug placed inside the main channel. When the lower pressure is greater than the upper pressure, the stop sleeve prevents the ball or rubber plug from moving upward.

3. The multi-functional ball and pin short sub of claim 1, wherein: An end cap is provided on the outer side of the rotating groove on the wall of the ball-throwing body. The four corners of the end cap are connected to the outer wall of the ball-throwing body by first screws. A stopper cap is provided inside the end cap. The stopper cap is located between the end cap and the stopper valve and is fitted onto the stopper valve. Sealing rings are provided at both ends of the stopper valve. The inner side wall of the stopper cap is sealed to one end of the stopper valve by the sealing ring. The other end of the stopper valve is also sealed to the ball-throwing body by a sealing ring. The outer side wall of the stopper cap is sealed to the ball-throwing body by a second O-ring.

4. The multi-functional ball-and-pin socket nipple according to claim 3, wherein: The stop valve is located on the outside of the ball-throwing body and has a handwheel. The stop valve has a square shaft near the end cap. The handwheel and the square shaft are fixedly connected by a second screw and a washer. The stop valve is rotated synchronously by rotating the handwheel.

5. The multi-functional ball-and-pin socket nipple of claim 4 wherein: A limiting block is provided between the handwheel and the end cover. The limiting block has a square hole in the center and is fitted onto a square shaft at one end of the stop valve. The limiting block has a limiting groove that cooperates with a limiting screw on the end cover to restrict the handwheel to rotate only 90 degrees in both directions. The handwheel has a safety screw. By adjusting the safety screw, the rotation between the handwheel and the end cover is further restricted.

6. The multi-functional ball and pin short sub of claim 1, wherein: Torque blocks are provided on both sides of the outer wall of the upper end of the ball-throwing body and the upper connector connection part. The torque blocks are located in the torque grooves provided on both sides of the outer wall of the ball-throwing body and the upper connector connection part. The torque blocks are fixed to the ball-throwing body by a third screw.

7. A multi-functional ball-throwing and plug-throwing short section according to claim 6, characterized in that: The torque block is externally provided with a protection ring, the protection ring is wrapped outside the torque block, and the protection ring is fixedly connected with the torque block through the fourth screw.

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