Blowout preventer capable of preventing and controlling back pressure of water drilling hole

Abstract

The utility model relates to the field of mining back pressure blowout preventers, and discloses a water prevention drill hole back pressure blowout preventer which comprises a barrel, end plates are fixedly connected to the two ends of the inner side wall of the barrel, and first through holes are formed in the end plates; the water drain pipe is communicated with the side wall of the barrel; a plurality of plugging plates are slidably connected in the cylinder and above the water drain pipe in the radial direction of the cylinder, the plugging plates are circumferentially arranged at intervals in the axis direction of the cylinder, elastic plugging rings are fixedly connected to the sides, close to the axis of the cylinder, of the plugging plates, and the upper end faces of the elastic plugging rings are slidably connected with the lower surface of the upper end plate. The outer diameter of the elastic plugging ring is greater than the inner diameter of the first through hole; and the driving assembly and the resetting assembly are used for driving the plugging plate to move towards and away from one side of the axis direction of the barrel body respectively. The reset assembly is arranged, after the hole spraying phenomenon is finished, combination between the elastic plugging ring and the drill rod can be removed, and the drill rod can be conveniently pulled out of the first through hole.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of mine counter pressure blowout preventer, especially to a kind of counter pressure blowout preventer for water drilling. BACKGROUND

[0002] In the process of geological drilling and mining, high-pressure water layer is often encountered. When drilling through high-pressure water layer, due to pressure mutation, liquid in the hole will quickly gush out, forming a blowout phenomenon, which not only causes damage to drilling equipment, but also poses a safety threat to the operating personnel.

[0003] Patent No. CN220451830U discloses a counter pressure blowout preventer for water drilling. When the water pressure is too high, the pressure pushes the base upwards, the elastic plug enters the first through hole on the main body, and the gap between the hole wall of the first through hole and the drill rod is sealed, which has the functions of counter pressure and blowout prevention. However, the elastic plug of this patent does not have a reset structure. After the elastic plug seals the gap between the hole wall of the first through hole and the drill rod, it cannot be reset. When the drill rod is pulled out, the drill rod is likely to cause the elastic plug to be squeezed in the first through hole, which makes it difficult to pull out the drill rod or causes the elastic plug to be deformed.

[0004] Therefore, how to change the situation that the elastic plug cannot be reset after sealing the gap between the hole wall of the first through hole and the drill rod has become a technical problem that needs to be solved by those skilled in the art. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a counter pressure blowout preventer for water drilling to overcome the above-mentioned shortcomings.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0007] A counter pressure blowout preventer for water drilling includes:

[0008] A cylinder body has end plates fixedly connected to both ends of its inner side wall, and the end plates are provided with first through holes;

[0009] A drain pipe is in communication with the side wall of the cylinder body;

[0010] A plurality of sealing plates are slidingly connected to the cylinder body in the radial direction, and the sealing plates are circumferentially and intervaliy arranged along the axial direction of the cylinder body. An elastic sealing ring is fixedly connected to the side of the sealing plate close to the axial line of the cylinder body. The upper end surface of the elastic sealing ring is slidingly connected to the lower surface of the upper end plate, and the outer diameter of the elastic sealing ring is greater than the inner diameter of the first through hole; and

[0011] A driving assembly for driving the blocking plate to move towards one side of the axis direction of the barrel, and a resetting assembly for driving the blocking plate to move away from the axis direction of the barrel.

[0012] Further, the driving assembly comprises:

[0013] An annular clamping seat fixedly connected to the inner side wall of the barrel, the blocking plate being located inside the annular clamping seat and being in sliding connection with the annular clamping seat in the radial direction of the barrel;

[0014] A driving plate in sliding connection between the annular clamping seat and the blocking plate in the axis direction of the barrel, the driving plate being in the shape of a ring and being made of flexible material, adjacent surfaces of the driving plate and the annular clamping seat being a first inclined surface and a second inclined surface in mutual sliding connection, the first inclined surface being inclined away from the axis direction of the barrel from top to bottom.

[0015] Further, the driving plate is provided in plurality, the plurality of driving plates being arranged in circumferential intervals in the axis direction of the barrel, lower ends of the plurality of driving plates being fixedly connected with a stress ring plate through a connecting ring plate, an outer side wall of the stress ring plate being in sliding connection with the inner side wall of the barrel and being provided with a second through hole arranged opposite to the first through hole, and a projection area of the stress ring plate in the vertical direction being greater than a projection area of the driving plate in the vertical direction.

[0016] Further, the resetting assembly comprises:

[0017] A first resetting assembly for driving the blocking plate to move away from the axis direction of the barrel; and

[0018] A second resetting assembly for driving the stress ring plate to move downwards.

[0019] Further, the first resetting assembly comprises:

[0020] The annular clamping seat is provided with a stepped through hole in the radial direction of the barrel, a large hole of the stepped through hole being connected with a small hole of the stepped through hole close to one side of the axis direction of the barrel;

[0021] A first elastic member located in the large hole of the stepped through hole; and

[0022] A first sliding rod in sliding connection in the stepped through hole, one end of the first sliding rod penetrating through a gap between adjacent driving plates and being fixedly connected with the blocking plate, the other end of the first sliding rod penetrating through the small hole of the stepped through hole and being in sliding connection in the large hole of the stepped through hole, the first elastic member being used to drive the first sliding rod to move away from one side of the axis direction of the barrel.

[0023] Further, the second reset assembly comprises:

[0024] a plurality of second sliding rods arranged along the direction parallel to the axis of the cylinder body, the plurality of second sliding rods are circumferentially and spacedly arranged along the direction of the axis of the cylinder body, the upper end of the second sliding rod is fixedly connected with the annular clamping seat, and the lower end of the second sliding rod is slidably penetrated through the stress ring plate and is fixedly connected with a second check ring; and

[0025] a second elastic member for driving the stress ring plate to move downward.

[0026] Further,

[0027] the first elastic member is a first compression spring, the first compression spring is located in the large hole of the stepped through hole, the other end of the first sliding rod is penetrated through the first compression spring and is fixedly connected with a first check ring, and the two ends of the first compression spring are connected with the end wall of the large hole of the stepped through hole and the first check ring respectively;

[0028] the second elastic member is a second compression spring, the second compression spring is coaxially sleeved on the side of the second sliding rod, and the two ends of the second compression spring are connected with the annular clamping seat and the stress ring plate respectively.

[0029] Further, the outer side wall of the connecting ring plate is provided with a first stop ring at the upper end, and the first stop ring is selectively abutted with the lower surface of the annular clamping seat.

[0030] The inner side wall of the cylinder body is fixedly connected with two second stop rings, and the two second stop rings are respectively correspondingly clamped with the upper surface of the annular clamping seat and the lower surface of the annular clamping seat.

[0031] Further, the elastic sealing ring comprises a plurality of sealing ring monomers, and the plurality of sealing ring monomers are circumferentially closed.

[0032] Further, the outer side wall of the lower end of the cylinder body is fixedly connected with a flange plate.

[0033] Compared with the prior art, the utility model in at least has following advantage:

[0034] First, the cylinder is fixedly connected to the ground. Then, the construction personnel control the drilling rig, causing the drill rod to pass through the first through hole and extend into the borehole. When a blowout occurs and the water pressure is low, the water level inside the cylinder continuously decreases or remains constant, and the water inside the cylinder flows out through the drain pipe. When a blowout occurs and the water pressure is high, the water level inside the cylinder continuously rises. At this time, the drive assembly moves the sealing plate towards the cylinder axis until the elastic sealing ring completely wraps around the drill rod. Because the elastic sealing ring forms a seal with the upper end plate, it effectively prevents high-pressure water from spraying out from the first through hole of the upper end plate, thus ensuring the safety of the construction personnel. After drilling is completed, the reset assembly drives the sealing plate to move away from the cylinder axis until the elastic sealing ring and the drill rod are properly fitted. Then, the drilling rig is controlled to pull the drill rod out of the first through hole, disconnecting the cylinder from the ground. Finally, the drilling rig and cylinder are stored away.

[0035] This invention, equipped with a driving component, can seal the gap between the drill rod and the first through hole in the upper end plate, preventing high-pressure water from spraying out of the first through hole and improving worker safety. Furthermore, this invention includes a reset component that can release the elastic sealing ring from the drill rod after the spraying phenomenon ends, allowing for a clearance fit between the elastic sealing ring and the drill rod, thus facilitating the extraction of the drill rod from the first through hole. During use, there will be no issues with the drill rod being unable to be extracted or the elastic sealing ring being deformed, extending the lifespan of the device. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a schematic diagram of the overall structure of the water-drilling back pressure anti-blowout device of this utility model;

[0038] Figure 2 This is a cross-sectional view of the water-drilling back pressure anti-blowout device of this utility model;

[0039] Figure 3 This utility model Figure 2 A magnified view of a portion of region A in the middle;

[0040] Figure 4 This is an exploded view of the water-drilling back pressure anti-blowout device of this utility model.

[0041] The figure marks: 1, barrel; 2, end plate; 3, first through hole; 4, drain pipe; 5, plugging plate; 6, elastic plugging ring; 7, annular clamping seat; 8, driving plate; 9, connecting ring plate; 10, stress ring plate; 11, second through hole; 12, stepped through hole; 13, first elastic member; 14, first sliding rod; 15, first blocking ring; 16, second elastic member; 17, second sliding rod; 18, second blocking ring; 19, first stop ring; 20, second stop ring; 21, flange. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0043] In order to make the above-mentioned purposes, features and advantages of the utility model more apparent and easy to understand, the utility model will be further described in detail below with reference to the drawings and specific embodiments.

[0044] Reference Figures 1-4 The utility model provides a kind of prevention and cure water drilling counterpressure anti-blowout device, including barrel 1, end plate 2, drain pipe 4, plugging plate 5, elastic plugging ring 6, driving assembly and reset component. Wherein, barrel 1 is hollow structure, and both ends are provided with opening, the inner side wall both ends of barrel 1 are fixedly connected with end plate 2, end plate 2 is provided with first through hole 3, first through hole 3 can be drilled through, and the inner diameter of first through hole 3 is greater than the outer diameter of drill pipe, drill pipe and first through hole 3 gap cooperation;Drain pipe 4 is welded on the outer side wall of barrel 1, drain pipe 4 is located between two end plates 2, and drain pipe 4 is communicated with barrel 1, the number of drain pipe 4 is installed according to actual use, the utility model does not make limitation, high pressure water into the barrel 1 can flow out through drain pipe 4, thereby can guarantee the safety of construction personnel;Multiple plugging plate 5 is located inside barrel 1, and is located above drain pipe 4, multiple plugging plate 5 can slide along the radial direction of barrel 1, multiple plugging plate 5 is circumferentially spaced along the axis of barrel 1, plugging plate 5 is fixedly connected with elastic plugging ring 6 on the side close to the axis of barrel 1, elastic plugging ring 6 uses butyronitrile rubber material, butyronitrile rubber has higher wear resistance, good water resistance and air tightness, and excellent adhesive property, the upper end of elastic plugging ring 6 is slidably connected with the lower surface of upper end plate, the outer diameter of elastic plugging ring 6 is greater than the inner diameter of first through hole 3;Driving assembly is used to drive plugging plate 5 to move to the side facing the axis direction of barrel 1, reset component is used to drive plugging plate 5 to move to the side facing away from the axis direction of barrel 1.

[0045] In this invention, the elastic sealing ring 6 comprises two sealing ring units, which are arranged in a circular shape.

[0046] Preferably, the driving assembly includes an annular retainer 7 and a driving plate 8. The annular retainer 7 is made of stainless steel and is fixedly connected to the inner wall of the cylinder 1. The sealing plate 5 is located inside the annular retainer 7 and is slidably connected to the annular retainer 7 along the radial direction of the cylinder 1. The driving plate 8 is slidably connected between the annular retainer 7 and the sealing plate 5 along the axial direction of the cylinder 1. The driving plate 8 is annular and made of flexible material, preferably rubber. The adjacent surfaces of the driving plate 8 and the annular retainer 7 are a first inclined surface and a second inclined surface that are slidably connected to each other. The first inclined surface is inclined from top to bottom in a direction away from the axial direction of the cylinder 1. When the driving plate 8 slides upward relative to the annular retainer 7, it can squeeze the sealing plate 5 to move towards the side closer to the axial direction of the cylinder 1.

[0047] Specifically, two second stop rings 20 are fixedly connected to the inner wall of the cylinder 1. The two second stop rings 20 are welded and fixed to the inner wall of the cylinder 1. The two second stop rings 20 are respectively engaged with the upper surface and the lower surface of the annular bracket 7, thereby realizing the fixing process of the annular bracket 7.

[0048] In one specific embodiment of this utility model, multiple drive plates 8 are provided, arranged circumferentially along the axis of the cylinder 1. The lower ends of the multiple drive plates 8 are fixedly connected to a force-bearing ring plate 10 via a connecting ring plate 9. The force-bearing ring plate 10 is slidably connected to the inner wall of the cylinder 1 and has a second through hole 11 arranged opposite to the first through hole 3. The projected area of ​​the force-bearing ring plate 10 in the vertical direction is larger than that of the drive plate 8 in the vertical direction. The force-bearing ring plate 10 increases the contact area with high-pressure water. This ensures that when subjected to the thrust of high-pressure water, it can overcome the force of the reset component, causing the drive plate 8 to slide upward relative to the annular seat 7, thereby squeezing the sealing plate 5 to move towards the side closer to the circumference of the cylinder 1, and then wrapping the drill rod, thereby achieving the effect of sealing the gap between the drill rod and the upper first through hole 3, and further preventing high-pressure water from gushing out from the upper first through hole 3.

[0049] Preferably, the reset assembly includes a first reset assembly and a second reset assembly. The first reset assembly is used to drive the sealing plate 5 to move to the side opposite to the axis of the cylinder 1; the second reset assembly is used to drive the force-bearing ring plate 10 to move downward.

[0050] Preferably, the first reset assembly includes a stepped through hole 12 on an annular seat 7 arranged radially along the cylinder 1. A small hole of the stepped through hole 12 is connected to the larger hole of the stepped through hole 12 on the side closer to the axis of the cylinder 1. A first elastic element 13 is provided in the larger hole of the stepped through hole 12. A first sliding rod 14 is slidably connected in the stepped through hole 12. One end of the first sliding rod 14 passes through the gap between adjacent drive plates 8 and is fixedly connected to the sealing plate 5. The other end of the first sliding rod 14 passes through the small hole of the stepped through hole 12 and is slidably connected in the larger hole of the stepped through hole 12. The first elastic element 13 is used to drive the first sliding rod 14 to move in the direction opposite to the axis of the cylinder 1.

[0051] Specifically, the first elastic element 13 is a first compression spring, which is located inside the large hole of the stepped through hole 12. The other end of the first sliding rod 14 passes through the first compression spring and is fixedly connected to the first retaining ring 15. The two ends of the first compression spring are respectively connected to the end wall of the large hole of the stepped through hole 12 and the first retaining ring 15.

[0052] Preferably, the second reset assembly includes a second sliding rod 17, a second elastic element 16, and a second retaining ring 18.

[0053] Multiple second sliding rods 17 are arranged parallel to the axis of the cylinder 1, and the multiple second sliding rods 17 are arranged at circumferential intervals along the axis of the cylinder 1. The upper end of the second sliding rod 17 is fixedly connected to the annular seat 7, and the lower end of the second sliding rod 17 slides through the force-bearing ring plate 10 and is fixedly connected to the second retaining ring 18. The second elastic element 16 is used to drive the force-bearing ring plate 10 to move downward.

[0054] Specifically, the second elastic element 16 is a second compression spring, which is coaxially sleeved on the periphery of the second sliding rod 17, and the two ends of the second compression spring are respectively connected to the annular seat 7 and the force-bearing ring plate 10.

[0055] Preferably, a first stop ring 19 is provided at the upper end of the outer side wall of the connecting ring plate 9, and the stop ring selectively abuts against the lower surface of the annular card seat 7;

[0056] Preferably, a flange 21 is fixedly connected to the lower outer wall of the cylinder 1. The flange 21 is fixed to the ground using multiple expansion bolts, which can ensure the stability of the connection between the cylinder 1 and the ground.

[0057] The working principle of this utility model:

[0058] First, expansion bolts are used to fix flange 21 to the ground, thus achieving a stable connection between cylinder 1 and the ground. Then, the construction personnel control the drilling rig to make the drill rod pass through the first through hole 3 and extend into the borehole. When a blowout occurs and the water pressure is low, the water level in cylinder 1 continuously decreases or remains unchanged, and the water in cylinder 1 flows out through drain pipe 4. When a blowout occurs and the water pressure is high, the water level in cylinder 1 continuously rises. At this time, the water continuously impacts the force-bearing ring plate 10, causing it to slide upward relative to the annular seat 7, further driving plate 8 to continuously squeeze the sealing plate 5, causing it to move towards the side closer to the axis of cylinder 1, and then wrapping the drill rod, thereby achieving the effect of sealing the gap between the drill rod and the upper first through hole 3, further preventing high-pressure water from gushing out from the upper first through hole 3, thus ensuring the safety of the construction personnel. After drilling is completed, the force on the force-bearing ring plate 10 is stopped by high-pressure water. Under the action of the second compression spring, the force-bearing ring plate 10 slides downward relative to the annular seat 7. Under the action of the first compression spring, the sealing plate 5 moves in the direction opposite to the axis of the cylinder 1 until the elastic sealing ring 6 is in clearance fit with the drill rod. Then, the drilling machine is controlled to pull the drill rod out of the first through hole 3, disconnecting the cylinder 1 from the ground. Then the drilling machine and the cylinder 1 can be stored away.

[0059] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0060] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A device for preventing back pressure blowout in water drilling, characterized in that, include: The inner wall of the cylinder (1) is fixedly connected to both ends of the inner wall of the cylinder (1), and the end plate (2) is provided with a first through hole (3). A drain pipe (4) connected to the side wall of the cylinder (1); Located inside the cylinder (1) and above the drain pipe (4), a plurality of sealing plates (5) are slidably connected along the radial direction of the cylinder (1). The plurality of sealing plates (5) are arranged circumferentially at intervals along the axis of the cylinder (1). An elastic sealing ring (6) is fixedly connected to the side of the sealing plate (5) near the axis of the cylinder (1). The upper end face of the elastic sealing ring (6) is slidably connected to the lower surface of the upper end plate (2), and the outer diameter of the elastic sealing ring (6) is greater than the inner diameter of the first through hole (3). as well as A driving assembly and a reset assembly, wherein the driving assembly is used to drive the sealing plate (5) to move to one side facing the axis of the cylinder (1), and the reset assembly is used to drive the sealing plate (5) to move to one side away from the axis of the cylinder (1); The driving component includes: An annular bracket (7) is fixedly connected to the inner wall of the cylinder (1). The sealing plate (5) is located inside the annular bracket (7) and is slidably connected to the annular bracket (7) in the radial direction of the cylinder (1). A drive plate (8) is slidably connected between the annular card seat (7) and the sealing plate (5) along the axis of the cylinder (1). The drive plate (8) is annular and made of flexible material. The adjacent surfaces of the drive plate (8) and the annular card seat (7) are a first inclined surface and a second inclined surface that are slidably connected to each other. The first inclined surface is inclined from top to bottom in a direction away from the axis of the cylinder (1). Multiple drive plates (8) are provided, and the multiple drive plates (8) are arranged circumferentially along the axis of the cylinder (1). The lower ends of the multiple drive plates (8) are fixedly connected to a force-bearing ring plate (10) through a connecting ring plate (9). The outer side wall of the force-bearing ring plate (10) is slidably connected to the inner side wall of the cylinder (1) and is provided with a second through hole (11) opposite to the first through hole (3). The projected area of ​​the force-bearing ring plate (10) in the vertical direction is greater than the projected area of ​​the drive plate (8) in the vertical direction. The reset component includes: A first reset assembly for driving the sealing plate (5) to move to one side opposite to the axis of the cylinder (1); and A second reset assembly for driving the force-bearing ring plate (10) to move downward; The first reset component includes: The annular card holder (7) is provided with a stepped through hole (12) along the radial direction of the cylinder (1), and the large hole of the stepped through hole (12) is connected to the small hole of the stepped through hole (12) on the side of the cylinder (1) near the axis direction. The first elastic element (13) is located within the large hole of the stepped through hole (12); and A first sliding rod (14) is slidably connected in the stepped through hole (12). One end of the first sliding rod (14) passes through the gap between adjacent drive plates (8) and is fixedly connected to the sealing plate (5). The other end of the first sliding rod (14) passes through the small hole of the stepped through hole (12) and is slidably connected in the large hole of the stepped through hole (12). The first elastic element (13) is used to drive the first sliding rod (14) to move to the side opposite to the axis of the cylinder (1). The second reset component includes: A plurality of second sliding rods (17) are arranged parallel to the axis of the cylinder (1), and the plurality of second sliding rods (17) are arranged at circumferential intervals along the axis of the cylinder (1). The upper end of the second sliding rod (17) is fixedly connected to the annular retaining seat (7), and the lower end of the second sliding rod (17) slides through the force-bearing ring plate (10) and is fixedly connected to a second retaining ring (18); and The second elastic element (16) is used to drive the force-bearing ring plate (10) to move downward.

2. The anti-blowout device for water-drilled holes according to claim 1, characterized in that, The first elastic element (13) is a first compression spring. The first compression spring is located in the large hole of the stepped through hole (12). The other end of the first sliding rod (14) passes through the first compression spring and is fixedly connected to the first retaining ring (15). The two ends of the first compression spring are respectively connected to the end wall of the large hole of the stepped through hole (12) and the first retaining ring (15). The second elastic element (16) is a second compression spring. The second compression spring is coaxially sleeved on the periphery of the second sliding rod (17), and the two ends of the second compression spring are respectively connected to the annular seat (7) and the force-bearing ring plate (10).

3. The anti-blowout device for water drilling back pressure according to claim 1, characterized in that, The upper end of the outer side wall of the connecting ring plate (9) is provided with a first stop ring (19), which selectively abuts against the lower surface of the annular card seat (7). Two second stop rings (20) are fixedly connected to the inner wall of the cylinder (1). The two second stop rings (20) are respectively engaged with the upper surface and the lower surface of the annular bracket (7).

4. The anti-blowout device for water drilling back pressure according to claim 1, characterized in that, The elastic sealing ring (6) includes multiple sealing ring units, which are arranged in a circular shape.

5. The anti-blowout device for water drilling back pressure according to claim 1, characterized in that, A flange (21) is fixedly connected to the outer wall of the lower end of the cylinder (1).

Images