CN112963573A

CN112963573A - Multifunctional safety plug valve for petroleum drilling

Info

Publication number: CN112963573A
Application number: CN202110217382.3A
Authority: CN
Inventors: 高月芸
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-26
Filing date: 2021-02-26
Publication date: 2021-06-15

Abstract

The invention discloses a multifunctional safety plug valve for petroleum drilling, which belongs to the technical field of drilling tools and comprises a first shell, wherein a second shell is arranged on the upper side of the first shell, a third shell is arranged on the upper side of the second shell, a limiting sleeve is arranged in the first shell, a movable valve seat is connected in the limiting sleeve in a sliding manner, four uniformly distributed guide holes are drilled on the circumferential surface of the movable valve seat, baffles are fixedly connected in the four guide holes, a first spring is arranged on the upper side of the limiting sleeve, a limiting block is fixedly connected on the circumferential surface of the movable valve seat, and a ball valve is arranged in the second shell, so that the aim of preventing blowout is finally achieved by rotating the ball valve through a knob, the potential safety hazard caused by blowout at present is solved.

Description

Multifunctional safety plug valve for petroleum drilling

Technical Field

The invention relates to the technical field of drilling tools, in particular to a multifunctional safety plug valve for petroleum drilling.

Background

The plug valve is a rotary valve in a closing part or a plunger shape, and the opening or the closing of the valve is realized by rotating 90 degrees to enable a passage port on the plug to be communicated with or separated from a passage port on the valve body. The valve plug may be cylindrical or conical in shape. In a cylindrical valve plug, the passageway is generally rectangular; whereas in a tapered plug the passage is trapezoidal. These shapes make the construction of the plug valve lightweight. The invention is most suitable for use as a medium for switching off and on and for shunting, but may also be used for throttling, depending on the nature of the application and the erosion resistance of the sealing surfaces.

In the drilling operation, the blowout well kick incident often takes place, the emergence of blowout well kick can produce very big degree of difficulty to the drilling operation, the emergence of blowout well kick also can produce very big threat to drilling operation personnel's safety simultaneously, safety plug valve commonly used on the market at present can only avoid the blowout well kick through rotatory knob when meetting the blowout well kick incident and taking place, in the drilling operation process, because do not send the judgement drilling string position in the well, the knob of plug valve is unable rotatory, be in the closed condition, the blowout well kick now will unable the restraint, and then influence operation personnel's life safety, a multi-functional safety plug valve of oil drilling has been proposed in order to solve this problem.

Disclosure of Invention

1. Technical problem to be solved

The invention aims to provide a multifunctional safety plug valve for petroleum drilling, and aims to solve the problem that in the prior art, blowout and kick cannot be solved due to the fact that a knob of the plug valve cannot be opened in the drilling process.

2. Technical scheme

In order to solve the problems, the invention adopts the following technical scheme:

a multifunctional safety plug valve for petroleum drilling comprises a first shell, wherein a second shell is arranged on the upper side of the first shell, a third shell is arranged on the upper side of the second shell, a limiting sleeve is arranged in the first shell, a movable valve seat is connected in the limiting sleeve in a sliding manner, four guide holes which are uniformly distributed are drilled in the circumferential surface of the movable valve seat, baffles are fixedly connected in the four guide holes, a first spring is arranged on the upper side of the limiting sleeve, a limiting block is fixedly connected to the circumferential surface of the movable valve seat, a ball valve is arranged in the second shell, a slot is formed in the surface of the ball valve, a sliding sealing ring is arranged in the second shell, a sliding plate is arranged on the right side of the sliding sealing ring, four second springs which are uniformly distributed are fixedly connected to the right end of the sliding plate, and an insert block is fixedly connected to the, the left end center fixedly connected with knob main part of department of slide, be provided with the solid fixed valve seat in the second casing, finally can realize rotating the ball valve through the knob and reaching the present that prevents the blowout, when the deep well operation, can play the effect of check valve through rotating the plug valve, prevent the emergence of blowout to a great extent, improved the security of plug valve, solved because the potential safety hazard that the blowout now leads to.

First casing includes first threaded sleeve, first mounting hole, first inner chamber, second mounting hole and first mounting groove, first threaded sleeve fixed connection is in first casing lower extreme, first mounting hole, first inner chamber, second mounting hole and first mounting groove are all dug in first casing, spacing sleeve fixed connection is in first inner chamber, activity disk seat, first spring, stopper, four water conservancy diversion holes and four baffles all are located the second inner chamber.

The second casing includes third mounting hole, second mounting groove, second threaded sleeve, third mounting groove, fourth mounting groove and jack, third mounting hole, second mounting groove, third mounting groove, fourth mounting groove and jack are all dug in the second casing, second threaded sleeve fixed connection is in the upper end of second casing, the ball valve is located the third mounting hole, the standing valve seat is located third mounting hole and second mounting groove, the ball valve is located the downside of standing valve seat, third mounting groove and first mounting groove phase-match, equal sliding connection of sliding seal circle and slide is in the fourth mounting groove, four equal fixed connection of right-hand member in the right inner wall of fourth mounting groove of second spring, the inserted block is located the fourth mounting groove, knob main part activity is pegged graft in the jack.

The third casing includes first internal thread hole, second internal thread hole and fourth mounting hole, first internal thread hole, second internal thread hole and fourth mounting hole are all dug in the third casing, and second internal thread hole and second threaded sleeve phase-match.

As a preferred scheme of the present invention, a first sealing ring is fixedly connected to a lower inner wall of the first inner cavity, the first sealing ring is located at a lower side of the limiting sleeve, a third sealing ring is fixedly connected to the inside of the third mounting hole, and the third sealing ring is located between the fixed valve seat and the ball valve.

In a preferred embodiment of the present invention, the first housing and the second housing are fixed by welding, and the second seal ring is fixedly connected to the third mounting groove and the first mounting groove.

In a preferred embodiment of the present invention, the second casing and the third casing are connected by a screw thread, the second internally threaded hole is screwed to a surface of the second threaded sleeve, a fourth seal ring is fixedly connected to an upper end of the second threaded sleeve, and the fourth seal ring is located between the second casing and the third casing.

As a preferable scheme of the present invention, the insertion groove is cut in the left portion of the surface of the ball valve, the insertion block is matched with the insertion groove, and both the insertion groove and the insertion block are regular hexagons.

As a preferable scheme of the present invention, the first spring is fixedly connected to an upper end of the limiting sleeve, an upper end of the first spring is fixedly connected to a lower end of the limiting block, and the movable valve seat is located in the first spring.

In a preferred embodiment of the present invention, the diameters of the first mounting hole, the movable valve seat, the ball valve, the fixed valve seat and the fourth mounting hole are matched.

3. Advantageous effects

Compared with the prior art, the invention has the advantages that:

(1) when the device needs to be used, the knob body is held by a hand, the knob body is pushed rightwards, the sliding plate slides rightwards in the fourth mounting groove by moving the knob body rightwards, the four second springs are compressed by sliding the sliding plate rightwards, the insert block also moves rightwards by sliding the sliding plate, the insert block is inserted into the slot by moving the insert block rightwards, the knob body is rotated clockwise by ninety degrees after the insert block is inserted into the slot, the ball valve is driven to rotate by ninety degrees by rotating the knob body, the hole in the ball valve is not communicated with the fixed valve seat and the movable valve seat by rotating the ball valve, the blowout prevention is completed at the moment, when the drilling operation needs to reach the well depth which cannot operate the knob body, the ball valve is closed before the drilling operation, the ball valve cannot be communicated with the fixed valve seat and the movable valve seat, and then the drilling operation is carried out, at the moment, the device forms a check valve only from top to bottom, when slurry enters the device from the fourth mounting hole, the slurry passes through the fixed valve seat and directly impacts the surface of the ball valve, the ball valve is pushed downwards by the impact force of the slurry, when the impact force of the slurry is greater than the elastic force of the first spring, the ball valve moves downwards, the movable valve seat moves downwards by the downward movement of the ball valve, the limiting block moves downwards by the downward movement of the movable valve seat, because the impact force of the slurry is greater than the elastic force of the first spring, the first spring is compressed by the downward movement of the limiting block, then the slurry enters the second inner cavity through the third mounting hole, when the movable valve seat moves downwards continuously until the slurry is contacted with the four diversion holes, the slurry in the second inner cavity flows downwards through the four diversion holes, finally flows outwards from the first mounting hole smoothly, when a well blowout phenomenon occurs, slurry moves upwards from the lower part, the slurry impacts the ball valve from bottom to top at the moment, a part of the slurry is blocked by four baffles on the way of impacting the ball valve, then a part of the slurry enters the second inner cavity through four diversion holes, so that the impact force of the slurry from bottom to top is reduced, the ball valve is pushed upwards by the impact force of the slurry, the ball valve is limited by the fixed valve seat, so the slurry cannot be sprayed upwards through the ball valve, a limit block is pushed to move upwards in the second inner cavity, the limit block limits the second mounting hole, so the slurry in the second inner cavity cannot be sprayed upwards from the second shell, the occurrence of a blowout phenomenon is further prevented, finally the situation that the existing blowout is prevented by rotating the ball valve through the knob can be realized, the plug valve can be rotated to play a role of a check valve during deep well operation, and the occurrence of the blowout is greatly prevented, the safety of the plug valve is improved, and the potential safety hazard caused by blowout at present is solved.

(2) In this scheme, the fixed of first threaded sleeve is for facilitating the connection outside drilling string, and the excavation of first mounting hole is for facilitating the mud circulation, and the excavation of first inner chamber is for facilitating the fixed stop sleeve, and the second inner chamber is for facilitating the holding movable valve seat, first spring, stopper, four water conservancy diversion holes and four baffles, and the second mounting hole is for facilitating the holding ball valve, and the excavation of first mounting groove is for facilitating the mutually supporting with the third mounting groove.

(3) In this scheme, the excavation of third mounting hole is for the convenience to hold the ball valve, the excavation of second mounting groove is for the convenience to cooperate with the third mounting hole and holds the solid fixed valve seat, second threaded sleeve and second internal thread hole phase-match, the third mounting groove is for the convenience to cooperate with first mounting groove and holds the second sealing washer, the fourth mounting groove is for the convenience to hold slip sealing washer, the slide, four second springs and inserted block, the jack is for the convenience to peg graft in the activity of knob main part.

(4) In this scheme, the excavation of first internal thread hole is for the convenience of connecting the outside drilling string, and the excavation of second internal thread hole is for the convenience of mutually supporting with the second screw sleeve, and the excavation of fourth mounting hole is for the convenience of mud circulation.

(5) In this scheme, the first sealing washer of lower inner wall fixedly connected with of first inner chamber, first sealing washer are located limiting sleeve's downside, the fixedly connected with third sealing washer in the third mounting hole, and the third sealing washer is located between standing valve seat and the ball valve, and first sealing washer is for the sake of facilitating the leakproofness that improves first casing lower part, and the third sealing washer is for the sake of facilitating the leakproofness that improves between standing valve seat and the ball valve.

Drawings

FIG. 1 is an exploded view of a multi-functional safety plug valve for oil drilling according to the present invention;

FIG. 2 is a first perspective cross-sectional view of a multi-functional safety plug valve for oil drilling of the present invention;

FIG. 3 is a second perspective cross-sectional view of a multi-functional safety plug valve for oil drilling of the present invention;

FIG. 4 is a perspective view of a multi-functional safety plug valve for oil drilling of the present invention;

FIG. 5 is a perspective view of the ball valve 10 of the multi-functional safety plug valve for oil drilling of the present invention;

fig. 6 is a perspective view of the movable valve seat 6 of the multifunctional safety plug valve for petroleum drilling of the invention.

The reference numbers in the figures illustrate:

1. a first housing; 101. a first threaded sleeve; 102. a first mounting hole; 103. a first lumen; 104. a second lumen; 105. a second mounting hole; 106. a first mounting groove; 2. a second housing; 201. a third mounting hole; 202. a second mounting groove; 203. a second threaded sleeve; 204. a third mounting groove; 205. a fourth mounting groove; 206. a jack; 3. a third housing; 301. a first internally threaded bore; 302. a second internally threaded bore; 303. a fourth mounting hole; 4. a first seal ring; 5. a limiting sleeve; 6. a movable valve seat; 7. a first spring; 8. a limiting block; 9. a second seal ring; 10. a ball valve; 11. a knob body; 12. sliding the seal ring; 13. a slide plate; 14. a second spring; 15. inserting a block; 16. a third seal ring; 17. a fixed valve seat; 18. a fourth seal ring; 19. a slot; 20. a flow guide hole; 21. and a baffle plate.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1-6, a multifunctional safety plug valve for oil drilling comprises a first housing 1, a second housing 2 is disposed on the upper side of the first housing 1, a third housing 3 is disposed on the upper side of the second housing 2, a limiting sleeve 5 is disposed in the first housing 1, a movable valve seat 6 is slidably connected to the limiting sleeve 5, four uniformly distributed guide holes 20 are drilled on the circumferential surface of the movable valve seat 6, baffles 21 are fixedly connected to the four guide holes 20, a first spring 7 is disposed on the upper side of the limiting sleeve 5, a limiting block 8 is fixedly connected to the circumferential surface of the movable valve seat 6, a ball valve 10 is disposed in the second housing 2, a slot 19 is disposed on the surface of the ball valve 10, a sliding seal ring 12 is disposed in the second housing 2, a sliding plate 13 is disposed on the right side of the sliding seal ring 12, four uniformly distributed second springs 14 are fixedly connected to the right end, the center of the right end of the sliding plate 13 is fixedly connected with an inserting block 15, the center of the left end of the sliding plate 13 is fixedly connected with a knob main body 11, and a fixed valve seat 17 is arranged in the second shell 2.

The shell of the device consists of a first shell 1, a second shell 2 and a third shell 3, a limiting sleeve 5 is used for facilitating the movable insertion of a movable valve seat 6 and facilitating the fixation of a first spring 7, the movable valve seat 6 is used for facilitating the excavation of four guide holes 20, the four guide holes 20 are used for facilitating the downward flow of slurry in a second inner cavity 104 through the four guide holes 20 and facilitating the reduction of the impact force of the slurry from bottom to top in the well blowout prevention, four baffles 21 are used for facilitating the prevention of the slurry from entering the second inner cavity 104 from top to bottom, the impact force of the slurry is reduced from bottom to top in the slurry, a limiting block 8 is used for facilitating the compression of the first spring 7, the limiting block 8 is used for facilitating the limiting of the first spring 7, and a ball valve 10 is used for facilitating the connection of a fixed valve seat 17 and the movable valve seat 6, the knob body 11 is used for fixing the sliding plate 13, the sliding plate 13 is used for fixing the four second springs 14, the four second springs 14 are used for supporting the sliding plate 13 through elastic action, the insertion block 15 is used for being inserted into the insertion groove 19, the sliding seal ring 12 is used for improving the sealing performance when the sliding plate 13 moves, the insertion groove 19 is used for being matched with the insertion block 15, and the fixed valve seat 17 is used for being matched with the ball valve 10.

First casing 1 includes first threaded sleeve 101, first mounting hole 102, first inner chamber 103, second inner chamber 104, second mounting hole 105 and first mounting groove 106, first threaded sleeve 101 fixed connection is in first casing 1 lower extreme, first mounting hole 102, first inner chamber 103, second inner chamber 104, second mounting hole 105 and first mounting groove 106 all dig in first casing 1, stop sleeve 5 fixed connection is in first inner chamber 103, movable valve seat 6, first spring 7, stopper 8, four water conservancy diversion holes 20 and four baffles 21 all are located second inner chamber 104.

The first threaded sleeve 101 is fixed to facilitate connection with an external drill string, the first mounting hole 102 is drilled to facilitate mud circulation, the first inner cavity 103 is drilled to facilitate fixation of the stop sleeve 5, the second inner cavity 104 is drilled to facilitate accommodation of the movable valve seat 6, the first spring 7, the stop block 8, the four guide holes 20 and the four baffles 21, the second mounting hole 105 is drilled to facilitate accommodation of the ball valve 10, and the first mounting hole 106 is drilled to facilitate cooperation with the third mounting hole 204.

The second housing 2 includes a third mounting hole 201, a second mounting groove 202, a second threaded sleeve 203, a third mounting groove 204, a fourth mounting groove 205 and a jack 206, the third mounting hole 201, the second mounting groove 202, a third mounting groove 204, the fourth mounting groove 205 and the jack 206 are all cut in the second housing 2, the second threaded sleeve 203 is fixedly connected to the upper end of the second housing 2, the ball valve 10 is located in the third mounting hole 201, the fixed valve seat 17 is located in the third mounting hole 201 and the second mounting groove 202, the ball valve 10 is located at the lower side of the fixed valve seat 17, the third mounting groove 204 is matched with the first mounting groove 106, the sliding seal ring 12 and the sliding plate 13 are both slidably connected to the fourth mounting groove 205, the right ends of the four second springs 14 are both fixedly connected to the right inner wall of the fourth mounting groove 205, the plug 15 is located in the fourth mounting groove 205, and the knob body 11 is movably plugged in the jack 206.

The third mounting hole 201 is drilled to accommodate the ball valve 10, the second mounting groove 202 is drilled to accommodate the fixed valve seat 17 in cooperation with the third mounting hole 201, the second threaded sleeve 203 is matched with the second internal threaded hole 302, the third mounting groove 204 is drilled to accommodate the second sealing ring 9 in cooperation with the first mounting groove 106, the fourth mounting groove 205 is drilled to accommodate the sliding sealing ring 12, the sliding plate 13, the four second springs 14 and the insert 15, and the insert 206 is inserted in the knob body 11 in a movable manner.

The third housing 3 includes a first internally threaded hole 301, a second internally threaded hole 302, and a fourth mounting hole 303, the first internally threaded hole 301, the second internally threaded hole 302, and the fourth mounting hole 303 are all bored in the third housing 3, and the second internally threaded hole 302 is matched with the second threaded sleeve 203.

The first internally threaded bore 301 is drilled to facilitate connection to an external drill string, the second internally threaded bore 302 is drilled to facilitate interaction with the second threaded sleeve 203, and the fourth mounting bore 303 is drilled to facilitate mud circulation.

Specifically, referring to fig. 1-3, a first sealing ring 4 is fixedly connected to a lower inner wall of the first inner cavity 103, the first sealing ring 4 is located at a lower side of the limiting sleeve 5, a third sealing ring 16 is fixedly connected to the third mounting hole 201, and the third sealing ring 16 is located between the fixed valve seat 17 and the ball valve 10.

In this embodiment, the lower inner wall of the first inner cavity 103 is fixedly connected with the first sealing ring 4, the first sealing ring 4 is located on the lower side of the limiting sleeve 5, the third sealing ring 16 is fixedly connected in the third mounting hole 201, the third sealing ring 16 is located between the fixed valve seat 17 and the ball valve 10, the first sealing ring 4 is used for improving the sealing performance of the lower portion of the first housing 1, and the third sealing ring 16 is used for improving the sealing performance between the fixed valve seat 17 and the ball valve 10.

Specifically, referring to fig. 1 to 3, the first casing 1 and the second casing 2 are fixed by welding, and the second sealing ring 9 is fixedly connected in the third installation groove 204 and the first installation groove 106.

In this embodiment, the first casing 1 and the second casing 2 are fixed by welding, the welding is convenient for improving the stability of the device, the second sealing ring 9 is fixedly connected in the third mounting groove 204 and the first mounting groove 106, and the second sealing ring 9 is convenient for improving the sealing performance of the welding position and preventing external infiltration.

Specifically, referring to fig. 1 to 3, the second housing 2 and the third housing 3 are connected by a screw thread, the second internal threaded hole 302 is connected to the surface of the second threaded sleeve 203 by a screw thread, the upper end of the second threaded sleeve 203 is fixedly connected with the fourth sealing ring 18, and the fourth sealing ring 18 is located between the second housing 2 and the third housing 3.

In this embodiment, the second casing 2 and the third casing 3 are connected by a screw, the second internal threaded hole 302 is screwed on the surface of the second threaded sleeve 203, the upper end of the second threaded sleeve 203 is fixedly connected with the fourth sealing ring 18, the fourth sealing ring 18 is located between the second casing 2 and the third casing 3, the second internal threaded hole 302 and the second threaded sleeve 203 are convenient for the screw connection of the second casing 2 and the third casing 3, and the fourth sealing ring 18 is convenient for improving the sealing performance at the connection position of the second casing 2 and the third casing 3.

Specifically, referring to fig. 1-6, a slot 19 is cut in the left portion of the surface of the ball valve 10, the insert 15 is matched with the slot 19, and the slot 19 and the insert 15 are regular hexagons.

In this embodiment, the slot 19 is cut in the left portion of the surface of the ball valve 10, the insertion block 15 is matched with the slot 19, both the slot 19 and the insertion block 15 are regular hexagons, the insertion block 15 is convenient to be inserted into the slot 19, and the insertion block 15 and the slot 19 are regular hexagons to be convenient to improve the stability of insertion.

Specifically, referring to fig. 2, the first spring 7 is fixedly connected to the upper end of the limiting sleeve 5, the upper end of the first spring 7 is fixedly connected to the lower end of the limiting block 8, and the movable valve seat 6 is located in the first spring 7.

In this embodiment, first spring 7 fixed connection is in the upper end of stop sleeve 5, and first spring 7's upper end fixed connection is in the lower extreme of stopper 8, and movable valve seat 6 is located first spring 7, and first spring 7 is for the ease of supporting stopper 8, and then supports movable valve seat 6 through supporting stopper 8.

Specifically, referring to fig. 1-3, the diameters of the first mounting hole 102, the movable valve seat 6, the ball valve 10, the fixed valve seat 17, and the fourth mounting hole 303 are matched.

In this embodiment, the diameters of the first mounting hole 102, the movable valve seat 6, the ball valve 10, the fixed valve seat 17 and the fourth mounting hole 303 are matched to facilitate slurry circulation.

The working principle is as follows: when the device is needed to be used, the knob body 11 is held by hand, the knob body 11 is pushed rightwards, the sliding plate 13 slides rightwards in the fourth installation groove 205 due to the rightward movement of the knob body 11, the four second springs 14 are compressed due to the rightward sliding of the sliding plate 13, the insert block 15 also moves rightwards, the insert block 15 moves rightwards due to the rightward movement of the insert block 15, the insert block 15 is inserted into the insertion groove 19, the knob body 11 rotates ninety degrees clockwise after the insert block 15 is inserted into the insertion groove 19, the ball valve 10 rotates ninety degrees due to the rotation of the knob body 11, the hole in the ball valve 10 is not communicated with the fixed valve seat 17 and the movable valve seat 6 due to the rotation of the ball valve 10, at this time, the blowout is prevented, when the drilling operation needs to reach the well depth which can not operate the knob body 11, the ball valve 10 is closed before the drilling operation is carried out, so that the ball valve 10 can not be, then, the drilling operation is carried out, at the moment, the device forms a check valve only from top to bottom, when slurry enters the device from the fourth mounting hole 303, the slurry passes through the fixed valve seat 17 and directly impacts on the surface of the ball valve 10, the ball valve 10 is pushed downwards by the impact force of the slurry, when the impact force of the slurry is greater than the elastic force of the first spring 7, the ball valve 10 moves downwards, the downward movement of the ball valve 10 enables the movable valve seat 6 to move downwards, the downward movement of the movable valve seat 6 enables the limiting block 8 to move downwards, because the impact force of the slurry is greater than the elastic force of the first spring 7 at the moment, the downward movement of the limiting block 8 enables the first spring 7 to be compressed, then the slurry enters the second inner cavity 104 through the third mounting hole 201, when the movable valve seat 6 continuously moves downwards until the slurry contacts with the four diversion holes 20, the slurry in the second inner cavity 104 flows downwards through the four diversion holes, finally, the mud smoothly flows from the inside to the outside of the first mounting hole 102, when a blowout phenomenon occurs, the mud moves upwards from the lower part, the mud impacts the ball valve 10 from bottom to top, a part of the mud is blocked by the four baffles 21 on the way of impacting the ball valve 10, and then a part of the mud enters the second inner cavity 104 through the four diversion holes 20, so that the impact force of the mud from bottom to top is reduced, the ball valve 10 is pushed upwards by the impact force of the mud, the ball valve 10 is limited by the fixed valve seat 17, so that the mud cannot be sprayed upwards through the ball valve 10, the limiting block 8 is pushed to move upwards in the second inner cavity 104, the limiting block 8 limits the second mounting hole 105, so that the mud in the second inner cavity 104 cannot be sprayed upwards from the second shell 2, the occurrence of the blowout phenomenon is prevented, and finally the goal of preventing the blowout through rotating the ball valve by the knob can be achieved at present, when the deep well operation, can play the effect of check valve with the plug valve through rotating, prevent the emergence of blowout to a great extent, improve the security of plug valve, solved because the potential safety hazard that the blowout now leads to.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a multi-functional safety plug valve of oil drilling, includes first casing (1), its characterized in that: a second shell (2) is arranged on the upper side of the first shell (1), a third shell (3) is arranged on the upper side of the second shell (2), a limiting sleeve (5) is arranged in the first shell (1), a movable valve seat (6) is connected in the limiting sleeve (5) in a sliding mode, four guide holes (20) which are evenly distributed are drilled in the circumferential surface of the movable valve seat (6), baffles (21) are fixedly connected in the four guide holes (20), a first spring (7) is arranged on the upper side of the limiting sleeve (5), a limiting block (8) is fixedly connected to the circumferential surface of the movable valve seat (6), a ball valve (10) is arranged in the second shell (2), a slot (19) is formed in the surface of the ball valve (10), a sliding sealing ring (12) is arranged in the second shell (2), and a sliding plate (13) is arranged on the right side of the sliding sealing ring (12), the right end of the sliding plate (13) is fixedly connected with four second springs (14) which are uniformly distributed, the center of the right end of the sliding plate (13) is fixedly connected with an inserting block (15), the center of the left end of the sliding plate (13) is fixedly connected with a knob main body (11), and a fixed valve seat (17) is arranged in the second shell (2);

the first shell (1) comprises a first threaded sleeve (101), a first mounting hole (102), a first inner cavity (103), a second inner cavity (104), a second mounting hole (105) and a first mounting groove (106), the first threaded sleeve (101) is fixedly connected to the lower end of the first shell (1), the first mounting hole (102), the first inner cavity (103), the second inner cavity (104), the second mounting hole (105) and the first mounting groove (106) are all drilled in the first shell (1), the limiting sleeve (5) is fixedly connected in the first inner cavity (103), and the movable valve seat (6), the first spring (7), the limiting block (8), the four flow guide holes (20) and the four baffles (21) are all located in the second inner cavity (104);

the second shell (2) comprises a third mounting hole (201), a second mounting groove (202), a second threaded sleeve (203), a third mounting groove (204), a fourth mounting groove (205) and a jack (206), the third mounting hole (201), the second mounting groove (202), the third mounting groove (204), the fourth mounting groove (205) and the jack (206) are all drilled in the second shell (2), the second threaded sleeve (203) is fixedly connected to the upper end of the second shell (2), the ball valve (10) is positioned in the third mounting hole (201), the fixed valve seat (17) is positioned in the third mounting hole (201) and the second mounting groove (202), the ball valve (10) is positioned at the lower side of the fixed valve seat (17), the third mounting groove (204) is matched with the first mounting groove (106), the sliding sealing ring (12) and the sliding plate (13) are both slidably connected in the fourth mounting groove (205), the right ends of the four second springs (14) are fixedly connected to the right inner wall of a fourth mounting groove (205), the inserting block (15) is located in the fourth mounting groove (205), and the knob main body (11) is movably inserted in the inserting hole (206);

the third shell (3) comprises a first internal thread hole (301), a second internal thread hole (302) and a fourth mounting hole (303), the first internal thread hole (301), the second internal thread hole (302) and the fourth mounting hole (303) are all dug in the third shell (3), and the second internal thread hole (302) is matched with the second threaded sleeve (203).

2. The multifunctional safety plug valve for petroleum drilling according to claim 1, characterized in that: the lower inner wall fixedly connected with first sealing washer (4) of first inner chamber (103), first sealing washer (4) are located the downside of spacing sleeve (5), fixedly connected with third sealing washer (16) in third mounting hole (201), third sealing washer (16) are located between solid fixed valve seat (17) and ball valve (10).

3. The multifunctional safety plug valve for petroleum drilling according to claim 2, characterized in that: the first casing (1) and the second casing (2) are fixed through welding, and the third mounting groove (204) and the first mounting groove (106) are internally and fixedly connected with a second sealing ring (9).

4. The multifunctional safety plug valve for petroleum drilling according to claim 3, characterized in that: through threaded connection between second casing (2) and third casing (3), second internal thread hole (302) threaded connection is in the surface of second threaded sleeve (203), the upper end fixedly connected with fourth sealing washer (18) of second threaded sleeve (203), fourth sealing washer (18) are located between second casing (2) and third casing (3).

5. The multifunctional safety plug valve for petroleum drilling according to claim 4, characterized in that: the insert groove (19) is cut in the left part of the surface of the ball valve (10), and the insert block (15) is matched with the insert groove (19).

6. The multifunctional safety plug valve for petroleum drilling according to claim 5, characterized in that: first spring (7) fixed connection is in the upper end of spacing sleeve (5), the upper end fixed connection of first spring (7) is in the lower extreme of stopper (8), activity disk seat (6) are located first spring (7).

7. The multifunctional safety plug valve for petroleum drilling according to claim 6, characterized in that: the diameters of the first mounting hole (102), the movable valve seat (6), the ball valve (10), the fixed valve seat (17) and the fourth mounting hole (303) are matched.