Wellhead blowout preventer

Abstract

The wellhead blowout preventer comprises a cavity and a sealing piece, a barrel cavity is formed in the middle of the cavity and vertically penetrates through the upper end face and the lower end face, two containing grooves are horizontally and symmetrically formed in the two sides of the barrel cavity, and two moving grooves are formed in the two sides of the cavity and penetrate through the containing grooves; sliding holes are vertically formed in the moving grooves in the two sides of the cavity in a penetrating mode, the sealing piece comprises a sliding rod and a guiding rod, the sliding rod is vertically connected into the sliding holes in a sliding mode, two guiding holes are symmetrically and horizontally formed in the sliding rod, the guiding rod is inserted into the guiding holes of the sliding rod in a sliding and penetrating mode, and cutting plates are horizontally and slidably connected into the symmetrical containing grooves in the upper portion of the barrel cavity. And the cutting plate is fixedly connected with the end part of the guide rod. The utility model solves the problem that the sealing performance of the wellhead is influenced because oil in the wellhead is easily ejected and overflows from a gap between the oil rod and the wellhead wall because the gap exists between the oil rod and the wellhead wall.

Description

Technical Field

[0001] The utility model relates to the technical field of blowout preventers, in particular to a wellhead blowout preventer. Background Art

[0002] Blowout preventers are used to close the wellhead during oil testing, well repair, and well completion operations to prevent blowout accidents. They combine the functions of full sealing and semi-sealing into one, and have the characteristics of simple structure, easy operation, and high pressure resistance. They are commonly used safety sealing wellhead devices in oil fields to prevent blowouts.

[0003] The publication number is CN204703835U, and the name is a wellhead blowout preventer, which includes: a connecting part, the connecting part has a connecting cavity and an installation cavity, and the connecting cavity and the installation cavity are connected; a plugging structure, the plugging structure is installed in the installation cavity; a driving device, the driving device is installed in the installation cavity, and the driving device is used to drive the plugging structure to move into the connecting cavity to plug the connecting cavity. When the pumping unit is working normally, the light rod of the pumping unit is inserted into the connecting cavity. Once the light rod is damaged and broken, the light rod falls into the pumping well. At this time, through the driving action of the driving device, the plugging structure can be pushed into the connecting cavity to plug the connecting cavity, so as to achieve the plugging of the wellhead of the pumping well, thereby preventing the mixture of oil, gas and water in the pumping well from spraying out to the outside of the wellhead. It can be seen that according to the wellhead blowout preventer of the utility model, the oil, gas and water leakage caused by the uncontrolled packing box caused by the light rod falling into the well after breaking off in the pumping well can be avoided, thereby improving the safety of the crude oil production site and reducing the safety hazards in the crude oil extraction process.

[0004] However, in order to prevent the oil in the oil well from spraying out from the oil rod when the oil rod breaks, the plugging structure is set to block the wellhead to prevent the oil from spraying out. However, there is a gap between the oil rod and the wellhead wall, which can easily cause the oil in the wellhead to spray out from the gap between the oil rod and the wellhead wall, thereby affecting the sealing of the wellhead. Utility Model Content

[0005] The utility model aims to provide a wellhead blowout preventer, aiming to improve the above-mentioned problems.

[0006] The utility model is achieved in this way:

[0007] A wellhead blowout preventer comprises a cavity and a sealing member, wherein a barrel cavity is provided in the middle of the cavity vertically penetrating through the upper and lower end surfaces, and two receiving grooves are provided horizontally and symmetrically on both sides of the barrel cavity, and two moving grooves are provided through the receiving grooves on both sides of the cavity, and sliding holes are provided vertically penetrating in the moving grooves on both sides of the cavity, the sealing member comprises a sliding rod and a guide rod, the sliding rod is vertically slidably connected in the sliding hole, and two guide holes are symmetrically and horizontally provided on the sliding rod, the guide rod is slidably penetrated and inserted in the guide hole of the sliding rod, cutting plates are horizontally slidably connected in the symmetrical receiving grooves on the upper part of the barrel cavity, and the cutting plates are fixedly connected to the ends of the guide rods, clamps are horizontally slidably connected in the symmetrical receiving grooves on the lower part of the barrel cavity, and the clamps are fixedly connected to the ends of the guide rods, two hydraulic rods are horizontally and symmetrically fixed on both sides of the outside of the cavity, and the output ends of the hydraulic rods extend into the moving grooves, and the output ends of the hydraulic rods are fixed to the ends of the sliding rods.

[0008] Furthermore, two brackets are symmetrically arranged on both sides of the upper and lower end surfaces of the cavity, and the two brackets are fixed on the upper and lower end surfaces of the cavity.

[0009] Furthermore, first springs are vertically fixed to both upper and lower ends of the slide bar, and the other end of the first spring is fixed to the bracket.

[0010] Furthermore, flange rings are horizontally arranged at both upper and lower ends of the cylindrical cavity of the cavity, and the flange rings are fixed at the ends of the cylindrical cavity.

[0011] Furthermore, a sealing member is detachably provided on the upper portion of the cylindrical cavity of the cavity, and the sealing member includes a fixing plate, and a through hole is vertically opened at the center of the fixing plate.

[0012] Furthermore, the fixing plate is fixed to the flange ring at the upper part of the cylinder cavity by bolts, and a guide rod is provided in the through hole of the fixing plate for vertical sliding, and a sealing plate is horizontally fixed to the bottom end of the guide rod, and the sealing plate is inserted into the cylinder cavity of the cavity.

[0013] Furthermore, a second spring is vertically sleeved on the upper part of the guide rod, and two ends of the second spring are respectively fixed on the end of the guide rod and the top surface of the fixing plate.

[0014] Compared with the prior art, the utility model has the following beneficial effects: during use, the oil rod is inserted into the barrel cavity of the cavity, and the hydraulic rods at the bottom of both sides of the cavity are started to push the guide rod to slide horizontally in the slide rod, and push the clamp to move out of the receiving groove. The clamps on both sides of the barrel cavity of the cavity are butted and squeezed on the outer wall of the oil rod, thereby sealing the gap between the oil rod and the barrel cavity, and preventing the oil in the wellhead from spraying and overflowing from the gap between the oil rod and the wellhead wall. At the same time, when the oil rod is sealed, the hydraulic rods on the upper parts of both sides of the cavity are started to push the guide rod to slide horizontally in the slide rod, and push the cutting plate to move out of the receiving groove. The cutting plates on both sides of the barrel cavity of the cavity are butted and squeezed on the oil rod. After the oil rod is cut off, the oil rod is sealed with two cutting plates, thereby blocking the oil in the oil rod from spraying and overflowing outward, thereby improving the sealing between the oil rod and the cavity during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0018] Figure 3 It is a schematic diagram of the structure of the cavity in the decomposed state in the embodiment of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure of the sealing member in the embodiment of the utility model in the decomposed state;

[0020] Figure 5 It is a schematic structural diagram of the blocking member in the embodiment of the utility model in a disassembled state.

[0021] In the figure: 1. cavity; 11. cylinder cavity; 12. storage groove; 13. moving groove; 14. sliding hole; 15. flange ring; 2. sealing member; 21. sliding rod; 211. first spring; 212. bracket; 22. guide rod; 23. clamp; 24. cutting plate; 25. hydraulic rod; 3. blocking member; 31. fixing plate; 32. guide rod; 33. sealing plate; 34. second spring. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model. Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the utility model for which protection is sought, but merely represents the selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the utility model.

[0023] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, a wellhead blowout preventer comprises a cavity 1 and a sealing member 2, wherein a barrel cavity 11 is provided in the middle of the cavity 1 vertically through the upper and lower end surfaces, and two receiving grooves 12 are provided horizontally and symmetrically on both sides of the barrel cavity 11, and two moving grooves 13 are provided through the receiving grooves 12 on both sides of the cavity 1, and sliding holes 14 are provided vertically through the moving grooves 13 on both sides of the cavity 1, and the sealing member 2 comprises a sliding rod 21 and a guide rod 22, and the sliding rod 21 is vertically slidably connected in the sliding hole 14, and Two guide holes are symmetrically opened horizontally on the slide rod 21, and the guide rod 22 is inserted into the guide hole of the slide rod 21. The symmetrical receiving grooves 12 at the upper part of the cylinder cavity 11 are horizontally slidably connected with cutting plates 24, and the cutting plates 24 are fixedly connected to the ends of the guide rods 22. The symmetrical receiving grooves 12 at the lower part of the cylinder cavity 11 are horizontally slidably connected with clamps 23, and the clamps 23 are fixedly connected to the ends of the guide rods 22. Two hydraulic rods are horizontally symmetrically fixed on both sides of the outside of the cavity 1. 25, and the output end of the hydraulic rod 25 extends into the moving groove 13, and the output end of the hydraulic rod 25 is fixed to the end of the slide bar 21. When in use, the oil rod is inserted into the barrel cavity 11 of the cavity 1, and the hydraulic rods 25 at the bottom of both sides of the cavity 1 are started to push the guide rod 22 to slide horizontally in the slide bar 21, and push the clamp 23 to move out of the receiving groove 12. The clamps 23 on both sides of the barrel cavity 11 of the cavity 1 are butt-jointed and squeezed on the outer wall of the oil rod, thereby sealing the gap between the oil rod and the barrel cavity 11, avoiding To prevent the oil in the wellhead from spraying out from the gap between the oil rod and the wellhead wall, when sealing the oil rod, the hydraulic rods 25 on the upper parts of both sides of the cavity 1 are started to push the guide rod 22 to slide horizontally in the slide rod 21, and the cutting plate 24 is pushed out of the receiving groove 12. The cutting plates 24 on both sides of the cylinder cavity 11 of the cavity 1 are docked and squeezed on the oil rod. After the oil rod is cut off, the two cutting plates 24 are used to seal the oil rod, thereby blocking the oil in the oil rod from spraying outward and overflowing, thereby improving the sealing between the oil rod and the cavity 1 during use.

[0024] See also Figure 3 and Figure 4 Two brackets 212 are symmetrically arranged on both sides of the upper and lower end surfaces of the cavity 1, and the two brackets 212 are fixed on the upper and lower end surfaces of the cavity 1. The upper and lower ends of the slide rod 21 are vertically fixed with first springs 211, and the other end of the first spring 211 is fixed on the bracket 212. When the oil pressure is large during use, when the cutting plate 24 or the clamp 23 is impacted, the impact force causes the cutting plate 24 or the clamp 23 to move vertically, and the guide rod 22 connected to the cutting plate 24 or the clamp 23 pushes the slide rod 21 to slide vertically in the sliding hole 14 of the cavity 1, squeezing the first spring 211 to deform on the bracket 212. The deformation force of the first spring 211 offsets the oil pressure, keeping the position of the cutting plate 24 or the clamp 23 sealing the oil rod stable.

[0025] See also Figure 3 and Figure 5 The upper and lower ends of the barrel cavity 11 of the cavity 1 are horizontally provided with flange rings 15, and the flange rings 15 are fixed to the ends of the barrel cavity 11. The upper part of the barrel cavity 11 of the cavity 1 is detachably provided with a plugging member 3, and the plugging member 3 includes a fixing plate 31, and a through hole is vertically opened at the center of the fixing plate 31. The fixing plate 31 is fixed to the flange ring 15 at the upper part of the barrel cavity 11 by bolts, and a guide rod 32 is vertically slidably opened in the through hole of the fixing plate 31, and a sealing plate 33 is horizontally fixed to the bottom end of the guide rod 32, and the sealing plate 33 is inserted into the barrel cavity 11 of the cavity 1, and the upper part of the guide rod 32 A second spring 34 is vertically sleeved, and the two ends of the second spring 34 are respectively fixed on the end of the guide rod 32 and the top surface of the fixed plate 31. In order to improve the sealing performance of the cavity 1 during use, the fixed plate 31 is fixedly installed on the upper flange ring 15 of the cylindrical cavity 11 of the cavity 1 by bolts, and the sealing plate 33 is inserted into the cylindrical cavity 11 of the cavity 1. When the sealing plate 33 is impacted by the oil, it moves upward, driving the guide rod 32 to slide up in the through hole of the fixed plate 31, causing the second spring 34 to deform, absorbing the impact pressure of the oil, and effectively maintaining the sealing performance of the cavity 1 to block the oil.

[0026] Working principle: During use, the oil rod is inserted into the barrel cavity 11 of the cavity 1, and the hydraulic rods 25 at the bottom of both sides of the cavity 1 are started to push the guide rod 22 to slide horizontally in the slide rod 21, and push the clamp 23 to move out of the receiving groove 12. The clamps 23 on both sides of the barrel cavity 11 of the cavity 1 are docked and squeezed on the outer wall of the oil rod, thereby sealing the gap between the oil rod and the barrel cavity 11 to prevent the oil in the wellhead from spraying and overflowing from the gap between the oil rod and the wellhead wall. At the same time, when the oil rod is sealed, the hydraulic rods 25 on the upper parts of both sides of the cavity 1 are started to push the guide rod 22 to slide horizontally in the slide rod 21, and push the cutting plate 24 to move out of the receiving groove 12. The cutting plates 24 on both sides of the barrel cavity 11 of the cavity 1 are docked and squeezed on the oil rod. After the oil rod is cut off, the two cutting plates 24 are used to block the oil rod, thereby blocking the oil in the oil rod from spraying and overflowing outward.

[0027] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A wellhead blowout preventer, characterized in that: The invention comprises a cavity (1) and a sealing member (2), wherein a cylindrical cavity (11) is provided in the middle of the cavity (1) vertically penetrating the upper and lower end surfaces, and two receiving grooves (12) are symmetrically provided on both sides of the cylindrical cavity (11), and two moving grooves (13) are provided on both sides of the cavity (1) penetrating the receiving grooves (12), and sliding holes (14) are vertically provided in the moving grooves (13) on both sides of the cavity (1), and the sealing member (2) comprises a sliding rod (21) and a guide rod (22), wherein the sliding rod (21) is vertically slidably connected in the sliding hole (14), and two guide holes are symmetrically provided on the sliding rod (21), and the guide rod (22) The guide holes (21) are inserted and slidably penetrated in the guide holes of the slide bar (21); the symmetrical receiving grooves (12) at the upper part of the cylinder cavity (11) are horizontally slidably connected with cutting plates (24), and the cutting plates (24) are fixedly connected to the end of the guide bar (22); the symmetrical receiving grooves (12) at the lower part of the cylinder cavity (11) are horizontally slidably connected with clamps (23), and the clamps (23) are fixedly connected to the end of the guide bar (22); two hydraulic rods (25) are horizontally symmetrically fixed on both sides of the outside of the cavity (1), and the output ends of the hydraulic rods (25) extend into the movable grooves (13), and the output ends of the hydraulic rods (25) are fixed to the ends of the slide bar (21).

2. A wellhead blowout preventer according to claim 1, characterized in that: Two brackets (212) are symmetrically arranged on both sides of the upper and lower end surfaces of the cavity (1), and the two brackets (212) are fixed on the upper and lower end surfaces of the cavity (1).

3. A wellhead blowout preventer according to claim 2, characterized in that: A first spring (211) is vertically fixed to both upper and lower ends of the slide bar (21), and the other end of the first spring (211) is fixed to a bracket (212).

4. A wellhead blowout preventer according to claim 1, characterized in that: Flange rings (15) are horizontally arranged at both upper and lower ends of the cylindrical cavity (11) of the cavity body (1), and the flange rings (15) are fixed to the ends of the cylindrical cavity (11).

5. A wellhead blowout preventer according to claim 4, characterized in that: A blocking piece (3) is detachably provided on the upper portion of the cylindrical cavity (11) of the cavity body (1), wherein the blocking piece (3) comprises a fixing plate (31), and a through hole is vertically provided at the center of the fixing plate (31).

6. A wellhead blowout preventer according to claim 5, characterized in that: The fixing plate (31) is fixed to the upper flange ring (15) of the cylindrical cavity (11) by means of bolts, and a guide rod (32) is provided in a through hole of the fixing plate (31) for vertical sliding penetration, and a sealing plate (33) is horizontally fixed to the bottom end of the guide rod (32), and the sealing plate (33) is inserted into the cylindrical cavity (11) of the cavity body (1).

7. A wellhead blowout preventer according to claim 6, characterized in that: A second spring (34) is vertically sleeved on the upper portion of the guide rod (32), and two ends of the second spring (34) are respectively fixed to the end of the guide rod (32) and the top surface of the fixing plate (31).

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