Splash-proof device of drill rod

Abstract

The invention relates to a splash-proof device of a drill rod, comprising: a body comprising a liquid inlet located at the top of the body and a liquid outlet located at the bottom of the body; the flow channel comprises a first flow channel and a second flow channel which are sequentially communicated between the liquid inlet and the liquid outlet; the liquid trend of the first flow channel is configured to be a first direction, and the liquid trend of the second flow channel is configured to be a second direction; the first direction is the gravity direction, and the second direction is opposite to the first direction; the first valve mechanism is arranged in the second flow channel; the first valve mechanism comprises a first base and a first sealing piece located on a first liquid hole of the first base. Under the action of gravity, the first sealing piece blocks the first liquid hole; and under the hydraulic action of the preset pressure in the second direction, the first sealing piece is jacked up, and the first liquid hole is opened. According to the anti-splashing device for the kelly bar, the liquid flow direction of drilling fluid can be converted in the anti-splashing device for the kelly bar, and then the effect that the first sealing piece seals the liquid flow channel through the gravity of the first sealing piece to prevent the drilling fluid from splashing is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of drilling tools, in particular to a splash-proof device for a drill rod. Background Art

[0002] During the oilfield drilling process, it is often necessary to remove or connect the drill pipe. When the drill pipe buckle is removed, the drilling fluid in the drill pipe cannot be emptied in time, causing the drilling fluid retained in the square drill pipe to rush out of the drill pipe hole and splash onto the drilling platform and even the operators, which not only causes a waste of drilling fluid, but also pollutes the on-site operating environment.

[0003] The use of a drill pipe anti-splash valve can prevent the splashing of drilling fluid. The principle is to close the liquid flow channel by pushing the piston up with a spring, thereby preventing the liquid in the drill pipe from overflowing. However, as the anti-splash valve works for a long time, the spring bears the pressure brought by the drilling fluid for a long time. The anti-splash valve is very likely to have insufficient thrust due to metal fatigue of the spring, which leads to failure of the piston seal. Summary of the invention

[0004] The invention provides a splash-proof device for a drill rod, which is used to prevent drilling fluid from splashing out from the inside of the square drill rod when the drill rod is disassembled, thereby polluting the working site.

[0005] The present invention provides a splash-proof device for a drill pipe, comprising: a main body, the main body comprising a liquid inlet located at the top thereof and a liquid outlet located at the bottom thereof; a flow channel arranged in the main body, the flow channel comprising a first flow channel and a second flow channel sequentially connected between the liquid inlet and the liquid outlet; the liquid direction of the first flow channel is configured to be a first direction, and the liquid direction in the second flow channel is configured to be a second direction; the first direction is the direction of gravity, and the second direction is the opposite of the first direction; and a first valve mechanism arranged in the second flow channel; the first valve mechanism comprises a first base, the first base comprises a first liquid hole penetrating along the second direction, and a first sealing member is arranged on the first liquid hole; under the action of gravity, the first sealing member blocks the first liquid hole.

[0006] In one embodiment, the main body includes: a diverter sleeve, the liquid inlet is located at the top of the diverter sleeve, and the bottom of the diverter sleeve is sealed; a diverter fluid, the diverter fluid is arranged in the diverter sleeve, and a second flow channel is arranged in the diverter fluid; a first flow channel is formed between the diverter sleeve and the diverter fluid, and the inlet of the second flow channel is located at the bottom of the diverter fluid.

[0007] In one embodiment, the main body also includes: an outer shell; a diverter sleeve is arranged inside the outer shell, and a third flow channel is formed between the two; the third flow channel is connected to the liquid outlet; and a connecting pipe, which is connected between the diverter body and the diverter sleeve to connect the second flow channel and the third flow channel.

[0008] In one embodiment, the outer shell and the diverter sleeve are coaxially arranged to form a second annulus therebetween, and the second annulus is connected to the liquid outlet; and / or the diverter sleeve and the diverter body are coaxially arranged to form a first annulus therebetween, and the first annulus is connected to the liquid inlet; the second flow channel is connected between the first annulus and the second annulus.

[0009] In one embodiment, the top of the flow divider is conical or truncated cone-shaped.

[0010] In one embodiment, an upper joint is disposed on the top of the body, and the upper joint includes a fourth flow channel, and the fourth flow channel is communicated with the liquid inlet and is coaxial with the flow divider.

[0011] In one embodiment, the first valve mechanism further includes an elastic member, and the elastic member applies an elastic force in a first direction to the first sealing member.

[0012] In one embodiment, the first sealing member includes a first sealing ball; the outer periphery of the first liquid hole is surrounded by a first arc surface groove; and the outer periphery of the first sealing ball abuts against the first arc surface groove.

[0013] In one embodiment, the first valve mechanism further includes a retaining ring, which is sleeved on the upper part of the first sealing ball, and the elastic member abuts against the retaining ring.

[0014] In one embodiment, the splash-proof device of the drill pipe also includes: a second valve mechanism, the second valve mechanism is arranged at the bottom of the diverter sleeve and below the diverter body, the second valve mechanism includes a one-way valve with a connection direction in a second direction; when the second valve mechanism is opened, the first flow channel and the liquid outlet are connected to each other.

[0015] In one embodiment, the second valve mechanism includes a second base and a second sealing member located on the second liquid hole of the second base; under the action of gravity, the second sealing member blocks the second liquid hole; under the hydraulic action of a preset pressure in the second direction, the second sealing member is lifted up and the second liquid hole is opened.

[0016] In one embodiment, the second sealing member includes a second sealing ball; the outer periphery of the second liquid hole is surrounded by a second arc surface groove; and the outer periphery of the second sealing ball abuts against the second arc surface groove.

[0017] In one embodiment, the second base is embedded in the inner circumference of the diverter sleeve, and a second sealing ring is sealingly disposed between the two.

[0018] In one embodiment, a lower joint is provided at the bottom of the body, and the lower joint includes a fifth flow channel, and the fifth flow channel is communicated with the liquid outlet and is coaxial with the second liquid hole.

[0019] Compared with the prior art, the present invention has the advantages that a first flow channel for flowing in the direction of gravity and a second flow channel for flowing in the direction of anti-gravity are arranged in the body of the splash-proof device, and a first valve mechanism is arranged in the second flow channel; when the splash-proof device of the drill pipe is connected to the drill pipe, the drilling fluid pump pumps out drilling fluid with a certain pressure, and the drilling fluid enters the first flow channel from the liquid inlet at the top of the body and then turns around and flows into the second flow channel, and the drilling fluid in the second flow channel flows in the direction of anti-gravity under the action of the pump pressure, and the first sealing member in the second flow channel is driven by the drilling fluid from the first flow channel to the second flow channel. When the base is lifted, the first fluid hole is opened, and the drilling fluid in the second flow channel flows out from the fluid outlet at the bottom of the body; when the drill pipe is removed, part of the drilling fluid is retained in the drill pipe, the first flow channel and the second flow channel. The drilling fluid without the pressurization of the drilling fluid pump cannot overcome the dead weight of the first sealing component. The first sealing component self-seals on the first fluid hole under the action of gravity, ensuring that the drilling fluid in the first flow channel and the second flow channel will not splash out from the fluid outlet at the bottom of the body, and the first sealing component that self-seals by gravity will not produce metal fatigue, thereby ensuring a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, the present invention will be described in more detail based on embodiments and with reference to the accompanying drawings.

[0021] Figure 1 is a schematic structural diagram of a splash-proof device for a drill pipe in an embodiment of the present invention;

[0022] Figure 2 AA sectional view of the splash prevention device of the drill pipe in the embodiment of the present invention.

[0023] Reference numerals:

[0024] 1. Upper joint; 2. First pressure cap; 3. First anti-twist key; 4. Second sealing ring; 5. Outer shell; 6. Diverter sleeve; 7. Diverter body; 7-1. Connecting pipe; 8. Spring; 9. Retaining ring; 10. First solid steel ball; 11. First base; 12. Second solid steel ball; 13. Second base; 13-1. Third liquid hole; 14. Lower joint; 100. Liquid inlet; 101. First flow channel; 102. Second flow channel; 103. Third flow channel; 104. Fourth flow channel; 105. Fifth flow channel; 106. Annular boss; 200. Liquid outlet. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] See also Figure 1The present embodiment provides a splash-proof device for a drill pipe, which is connected to a square drill pipe and comprises: a body, wherein the body comprises a liquid inlet 100 at the top thereof and a liquid outlet 200 at the bottom thereof; a flow channel for conveying drilling fluid connected between the liquid inlet 100 and the liquid outlet 200 is arranged in the body, and the flow channel comprises a first flow channel 101 and a second flow channel 102 which are connected in sequence along the liquid outlet direction during drilling; the liquid direction of the first flow channel 101 is configured as a first direction, and the liquid direction of the second flow channel 102 is configured as a second direction; the first direction is a gravity direction, and the second direction is the opposite direction of the first direction, i.e., an anti-gravity direction; a flow channel 102 is arranged in the second flow channel 102; There is a first valve mechanism, which includes a first base 11. The first base 11 is provided with a first liquid hole that passes through along the direction of total gravity. A first sealing member is arranged on the first base 11 to block the first liquid hole. When the drilling fluid pump connected to the square drill rod is working, the drilling fluid is pressurized, and the pressurized drilling fluid enters the second flow channel 102 through the first flow channel 101. The drilling fluid entering the second flow channel 102 flows along the second direction and overcomes the gravity of the first sealing member itself to lift it from the first base 11. At this point, the first sealing member releases the blockage of the first liquid hole, and the drilling fluid in the second flow channel 102 flows out from the liquid outlet 200 at the bottom of the main body. When the drilling fluid pump stops working or the splash-proof device of the drill pipe is removed from the square drill pipe, the drilling fluid in the second flow channel 102 loses pressurization; since the liquid level in the first flow channel 101 is higher than the liquid level in the second flow channel 102, based on the principle of communicating vessels, the drilling fluid in the first flow channel 101 and the second flow channel 102 still applies a certain amount of pressure to the first seal, and the pressure of this part of the drilling fluid can be calculated according to the liquid level difference between the first flow channel 101 and the second flow channel 102. Based on the pressure value applied by the drilling fluid in the first flow channel 101 and the second flow channel 102 to the first seal, an appropriate inner diameter is set for the first fluid hole, and a material with a certain density is selected to prepare a first seal that can overcome the above pressure based on its own weight, ensuring that the drilling fluid in the first flow channel 101 and the second flow channel 102 is not enough to overcome the gravity of the first seal to lift the first seal, and ensure that the first fluid hole is blocked by the first seal.

[0027] The main body includes an outer shell 5, a diverter sleeve 6 and a diverter body 7; the outer shell 5, the diverter sleeve 6 and the diverter body 7 are all cylindrical structures, wherein the outer shell 5 and the diverter sleeve 6 are open at both axial ends, and the diverter body 7 is closed at one axial end and open at the other axial end.

[0028] The flow divider 7 is provided with a second flow passage 102 extending along its axial direction. The flow divider 7 is arranged inside the flow divider sleeve 6, and the flow divider sleeve 6 is arranged inside the outer shell 5. The outer shell 5, the flow divider sleeve 6 and the flow divider 7 are arranged coaxially. The top of the flow divider 7 is sealed and the bottom is open. The bottom opening of the flow divider 7 is the entrance of the second flow passage 102. A first annulus is formed between the outer periphery of the flow divider 7 and the inner periphery of the flow divider sleeve 6, and the first annulus is the first flow passage 101 of the present invention; a second annulus is formed between the outer periphery of the flow divider sleeve 6 and the inner periphery of the outer shell 5, and the second annulus is the third flow passage 103 of the present invention. The liquid inlet 100 is located above the first flow passage 101.

[0029] The upper joint 1 includes a fourth flow channel 104 which is axially connected, the bottom of the fourth flow channel 104 is interconnected with the first flow channel 101, and the upper part of the fourth flow channel 104 is provided with a drill rod buckle for connecting the drill rod. The lower part of the upper joint 1 is connected with the outer shell 5 through a thread; an annular boss 106 protrudes axially from the bottom of the upper joint 1, and the annular boss 106 is embedded in the inner circumference of the diverter sleeve 6, and the outer circumference of the annular boss 106 abuts against the inner circumference of the diverter sleeve 6, so that the fourth flow channel 104 and the first flow channel 101 are interconnected. The outer circumference of the annular boss 106 is provided with a first annular groove along its radial inward concave, and a first sealing ring is provided in the first annular groove, and the first sealing ring is sealingly arranged between the annular boss and the diverter sleeve 6; the lower part of the upper joint 1 is also provided with a second annular groove, and the second annular groove is located above the first annular groove, and an O-type second sealing ring 4 is provided in the second annular groove, and the second sealing ring 4 is sealingly arranged between the lower part of the upper joint 1 and the inner wall of the outer shell 5. A first keyway is recessed radially inwardly at the middle of the upper joint 1, and a second keyway matching the first keyway is correspondingly provided at the upper part of the outer shell 5. The first keyway and the second keyway relatively form a keyway space, and the first anti-twist key 3 is placed in the above-mentioned keyway space. The first pressure cap 2 of the annular structure is connected to the outer periphery of the upper joint 1 by threads, and the bottom surface of the first pressure cap 2 abuts against the top surface of the outer shell 5. The first pressure cap 2 fixes the first anti-twist key 3 in the keyway space.

[0030] The lower joint 14 is embedded in the bottom of the outer shell 5. Specifically, the outer periphery of the lower joint 14 is threadedly connected to the inner periphery of the outer shell 5. The lower joint 14 includes a fifth flow channel 105 that runs through the axial direction thereof. A second anti-twist key is also provided between the lower joint 14 and the outer shell 5 and fixed by a second pressure cap. The structural principle thereof is the same as the first anti-twist key 3 and the first pressure cap 2 of the upper joint 1, and will not be repeated here. Thus, the upper joint 1, the outer shell 5 and the lower joint 14 realize the limited fit and the transmission of the upper and lower torques of the splash-proof device through the anti-twist key.

[0031] Combination Figure 1 and Figure 2The split sleeve 6 and the split body 7 have corresponding openings on both sides of the radial direction, and the two ends of the length of the connecting pipe 7-1 are respectively welded to the radial openings opposite to each other between the split sleeve 6 and the split body 7. The two connecting pipes 7-1 are arranged oppositely at the radial ends of the split body 7, and the connecting pipes 7-1 make the second flow channel 102 and the third flow channel 103 communicate with each other.

[0032] The first base 11 is embedded in the interior of the flow divider 7, specifically in the middle and lower part of the first flow channel 101, and the first base 11 is located below the connecting tube 7-1 and is threadedly connected to the inner wall of the flow divider 7. A first liquid hole is opened at the center of the first base 11, and the outer periphery of the first liquid hole is surrounded by a first arc surface groove; the first solid steel ball 10 is arranged in the first liquid hole, and the outer peripheral surface of the first solid steel ball 10 is tightly fitted with the surface of the first arc surface groove to block the first liquid hole. The retaining ring 9 is sleeved on the upper part of the first solid steel ball 10, and the outer periphery of the retaining ring is matched with the inner wall of the flow divider 7; the spring 8 is arranged in the second flow channel 102, and the extended two ends of the spring 8 respectively abut the flow divider 7 and the retaining ring 9. The spring 8 provides an elastic force in the direction of gravity to the first solid steel ball 10 through the retaining ring 9, and the first solid steel ball 10 is pressed tightly in the first arc surface groove. The first solid steel ball 10 is the first sealing member of the present invention.

[0033] The second valve mechanism is arranged at the bottom of the diverter sleeve 6 and below the diverter body 7, and the second valve mechanism seals the bottom of the diverter sleeve 6; the second valve mechanism includes a second base 13 and a second solid steel ball 12, and the lower part of the second base 13 is provided with a second liquid hole that penetrates the second base 13 along the axial direction of the diverter sleeve 6, and the second liquid hole is opposite to the fifth flow channel 105; the outer periphery of the second liquid hole is surrounded by a second arc surface groove; the second solid steel ball 12 is arranged in the second liquid hole; under the action of gravity, the outer periphery of the second solid steel ball 12 abuts against the second arc surface groove to block the second liquid hole. It should be noted that the second solid steel ball 12 can only be pushed by the drilling fluid in the direction of anti-gravity to open the second liquid hole, so the second valve mechanism is a one-way valve with the flow direction in the anti-gravity direction. The bottom of the second base 13 abuts against the upper end surface of the lower joint 14, the upper part of the second base 13 is threadedly connected to the bottom of the diverter sleeve 6, and a third sealing ring is arranged between the second base 13 and the diverter sleeve 6 to enhance the sealing effect between the two. The bottom of the second base 13 is provided with a third liquid hole 13-1, the third liquid hole 13-1 is located below the second liquid hole, and the third liquid hole 13-1 is connected between the third flow channel 103 and the fifth flow channel 105. The second solid steel ball 12 is the second sealing member of the present invention. The inner diameter of the second solid steel ball 12 is smaller than the inner diameter of the first solid steel ball 10, and the inner diameter of the second liquid hole is smaller than the inner diameter of the first liquid hole. The upper end of the fifth flow channel 105 is the liquid outlet 200 of the present invention.

[0034] During drilling, the splash-proof device of the drill pipe of the present embodiment is connected to the drill pipe through the drill pipe buckle of the upper joint 1, the drilling fluid pump is started, and the drilling fluid flows from the fourth flow channel 104 into the liquid inlet 100 located at the upper part of the first annulus. The flow divider 7 is coaxially arranged with the upper joint 1 and the fourth flow channel 104, and the top surface of the flow divider 7 faces the fourth flow channel 104. After the drilling fluid impacts the top surface of the flow divider 7, it disperses and flows into the first annulus. It should be noted here that in order to evenly guide the drilling fluid into the first flow channel 101, the flow divider 7 is arranged in a truncated cone or a conical shape. Such an arrangement can reduce the resistance of the flow divider 7 to the drilling fluid and make the drilling fluid evenly flow into every corner of the first flow channel 101. Under the action of gravity and pump pressure, the drilling fluid flows into the bottom of the first flow channel 101 and is blocked by the second solid steel ball 12 sealed on the second liquid hole, and the liquid flow direction is changed to flow upward from the inlet at the bottom of the diverter 7 into the second flow channel 102. Under the action of pump pressure, the drilling fluid in the second flow channel 102 overcomes the gravity of the first solid steel ball 10 and the elastic force of the spring 8, and lifts the first solid steel ball 10 from the first liquid hole. The retaining ring 9 passively moves upward, and the spring 8 is compressed to store energy. The drilling fluid in the second flow channel 102 flows into the third flow channel 103 through the connecting pipe 7-1, and flows into the fifth flow channel 105 through the third liquid hole 13-1 at the bottom of the third flow channel 103, and is discharged from the lower joint 14.

[0035] In some embodiments, the first sealing member and the second sealing member may be hollow steel balls or other metal balls, or may be solid balls made of other materials with sufficiently high density.

[0036] After drilling is completed, when the drilling fluid pump stops working or the splash-proof device of the drill pipe is removed from the square drill pipe, the force exerted by the drilling fluid in the second flow channel 102 on the first solid steel ball 10 is not enough to overcome the dead weight of the first solid steel ball 10, and the first solid steel ball 10 falls back to the initial position to block the first liquid hole. At this point, the drilling fluid in the drill pipe cannot be discharged from the drill pipe, thereby achieving the splash-proof effect of the drill pipe.

[0037] See also Figure 1 When the drilling fluid needs to be reversely circulated, the liquid enters from the fifth flow channel 105 of the lower joint 14. The fifth flow channel 105 is concentrically arranged with the second liquid hole. The drilling fluid entering through the fifth flow channel 105 directly impacts the bottom of the second solid steel ball 12. The drilling fluid with a certain pressure lifts the second solid steel ball 12 from the second base 13. The second liquid hole is opened, and the drilling fluid enters the first flow channel 101 and flows into the fourth flow channel 104 of the upper joint 1, thereby realizing the reverse circulation process of the drilling fluid.

[0038] In summary, the present invention can be connected to the square drill rod (or drill rod) to realize the diversion and control of the flow direction of the drilling fluid inside the tool. After the drilling fluid enters the fourth flow channel 104 of the upper joint through the square drill rod, it enters the first flow channel 101 formed by the diverter 7 and the diverter sleeve 6 through the top of the diverter 7, and then enters the bottom of the diverter 7 through the first flow channel 101. Because of the obstruction of the second solid steel ball 12, it turns upward. Under a certain pressure, the first solid steel ball 10 is pushed up and the spring 8 is compressed, and then it flows into the second flow channel 102 inside the diverter 7, and then flows into the third flow channel 103 composed of the diverter sleeve and the outer shell through the connecting pipe 7-1 between the diverter and the diverter sleeve. The liquid passes through the third flow channel 103 downward through the third liquid hole 13-1 below the second base 13 and enters the fifth flow channel 105 of the lower joint 14, thereby realizing the normal circulation of the drilling fluid. When the drilling fluid stops circulating, the first solid steel ball 10, under the combined effect of gravity and the elastic force of the spring 8, rests tightly against the first base 11, thereby closing the drilling fluid flow path. At this time, when the square drill rod is lifted and the drill rod buckle at the bottom of the present invention is removed, the liquid inside the square drill rod (or drill rod) will not overflow, thereby achieving the purpose of splash prevention.

[0039] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A splash-proof device for a drill pipe, It is characterized in that include: A body, the body comprising a liquid inlet located at the top and a liquid outlet located at the bottom; The flow channel is arranged in the body, the flow channel includes a first flow channel and a second flow channel which are sequentially connected between the liquid inlet and the liquid outlet; the liquid in the first flow channel flows in a first direction, and the liquid in the second flow channel flows in a second direction; the first direction is the direction of gravity, and the second direction is the opposite direction of the first direction; and, A first valve mechanism is arranged in the second flow channel; the first valve mechanism includes a first base, the first base includes a first liquid hole extending along the second direction, and a first sealing member is arranged on the first liquid hole; under the action of gravity, the first sealing member blocks the first liquid hole.

2. The splash-proof device for a drill pipe according to claim 1, It is characterized in that The body comprises: A flow divider sleeve, wherein the liquid inlet is located at the top of the flow divider sleeve, and the bottom of the flow divider sleeve is sealed; A flow divider, the flow divider is arranged in the flow divider sleeve, and the second flow channel is arranged in the flow divider; The first flow channel is formed between the flow dividing sleeve and the flow dividing body, and the inlet of the second flow channel is located at the bottom of the flow dividing body.

3. The splash-proof device for a drill pipe according to claim 2, It is characterized in that The body also includes: outer shell; The flow distribution sleeve is arranged inside the outer shell, and a third flow channel is formed between the two; the third flow channel is communicated with the liquid outlet; and, A connecting pipe is connected between the flow divider and the flow divider sleeve to allow the second flow channel to communicate with the third flow channel.

4. The splash-proof device for a drill pipe according to claim 3, Features: The outer shell and the diverter sleeve are coaxially arranged, and a second annulus is formed between the two, and the second annulus is communicated with the liquid outlet; And / or, the flow dividing sleeve and the flow dividing body are coaxially arranged, and a first annulus is formed between the two, and the first annulus is communicated with the liquid inlet; The second flow channel is communicated between the first annulus and the second annulus.

5. The splash-proof device for a drill pipe according to any one of claims 2 to 4, Features: The top of the flow divider is in a cone or frustum shape.

6. The splash-proof device for a drill pipe according to any one of claims 2 to 4, Features: An upper joint for connecting the drill pipe is arranged on the top of the body, and the upper joint comprises a fourth flow channel, and the fourth flow channel is communicated with the liquid inlet and is coaxial with the flow divider.

7. The splash-proof device for a drill pipe according to any one of claims 1 to 4, Features: The first valve mechanism further includes an elastic member, and the elastic member applies an elastic force in a first direction to the first sealing member.

8. The splash-proof device for a drill pipe according to claim 7, Features: The first sealing member includes a first sealing ball; The outer periphery of the first liquid hole is surrounded by a first arc surface groove; The outer periphery of the first sealing ball abuts against the first arc-surface groove.

9. The splash-proof device for a drill pipe according to claim 8, Features: The first valve mechanism further includes a retaining ring, which is sleeved on the upper part of the first sealing ball, and the elastic member abuts against the retaining ring.

10. The splash-proof device for a drill pipe according to any one of claims 2 to 4, It is characterized in that The splash-proof device of the drill pipe also includes: A second valve mechanism, the second valve mechanism is arranged at the bottom of the flow dividing sleeve and below the flow dividing body, and the second valve mechanism includes a one-way valve with a communication direction in a second direction; When the second valve mechanism is opened, the first flow channel and the liquid outlet are communicated with each other.

11. The splash-proof device for a drill pipe according to claim 10, Features: The second valve mechanism includes a second base and a second sealing member located on a second liquid hole of the second base; under the action of gravity, the second sealing member blocks the second liquid hole; Under the hydraulic pressure of the preset pressure in the second direction, the second sealing member is lifted up and the second liquid hole is opened.

12. The splash-proof device for a drill pipe according to claim 11, Features: The second sealing member includes a second sealing ball; The outer periphery of the second liquid hole is surrounded by a second arc-surface groove; The outer periphery of the second sealing ball abuts against the second arc surface groove.

13. The splash-proof device for a drill pipe according to claim 11, Features: The second base is embedded in the inner circumference of the diverter sleeve, and a second sealing ring is sealingly arranged between the two.

14. The splash-proof device for a drill pipe according to claim 11, Features: A lower joint is provided at the bottom of the body, and the lower joint includes a fifth flow channel, and the fifth flow channel is communicated with the liquid outlet and is coaxial with the second liquid hole.

Images