An annular blowout preventer for oil field wellhead

Abstract

The present invention relates to the field of oil wells, and in particular to an annular blowout preventer for an oilfield wellhead, comprising a blowout preventer base, a state monitoring component and a sealing reinforcement component. A top cover is fixedly arranged at the upper end of the blowout preventer base by bolts, a monitoring retaining ring is vertically arranged at the center of the blowout preventer base, a state monitoring component is arranged in the monitoring retaining ring of the blowout preventer base, and then a guide air pipe is arranged through a lifting piston seat, so that it is used correspondingly to an annular pressure sensing module through a pressing block. When the lifting piston seat controls a rubber core to seal a pipe bundle, the annular pressure sensing module monitors the lifting pressure of the lifting piston seat in real time, and maintains the sealing state of the rubber core clamping the pipe bundle. When the monitored pressure is abnormal, the movable sealing sleeve position of the lifting piston seat can be reinforced with contact sealing through the sealing reinforcement component. The pressure of the lifting piston seat is stably maintained during use, and timely response can be made, thereby improving the safety of construction operations.

Description

Technical Field

[0001] The invention relates to the field of oil wells, in particular to an annular blowout preventer used at an oil field wellhead. Background Art

[0002] The annular blowout preventer is an important part of the oil drilling wellhead device. It is a key equipment to ensure the safe, fast and high-quality drilling of high-pressure oil and gas layers. The annular blowout preventer is mainly composed of four parts: the shell, the top cover, the rubber core and the piston. Some annular blowout preventers also include wear-resistant plates, rubber baffles and other components;

[0003] When the annular blowout preventer is in use, the piston pushes the rubber core up, and then the rubber core contacts and deforms with the inner arc-shaped cavity of the top cover to seal the penetrating pipe bundle. The sealing effect between the rubber core and the pipe bundle depends on the pressure of the hydraulic lifting control. When the piston is used for a long time, the sealing structure is prone to aging and wear. When the piston is lifted to a high position, if a slight leakage of hydraulic pressure occurs, it is often not detected by the operator in time. At this time, the pushing pressure of the piston on the rubber core will decrease, which will affect the use effect of the rubber core and bring certain operational hazards. Summary of the invention

[0004] The object of the present invention is to provide an annular blowout preventer for an oil field wellhead to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: an annular blowout preventer for an oil field wellhead, comprising:

[0006] A blowout preventer base, wherein a top cover is fixedly provided at the upper end of the blowout preventer base by bolts, a monitoring retaining ring is vertically provided at the center of the blowout preventer base, a hydraulic oil chamber is sandwiched between the outer peripheral side of the monitoring retaining ring and the side wall of the blowout preventer base, a lifting piston seat is vertically movably inserted in the blowout preventer base, one side of the lifting piston seat is inserted into the hydraulic oil chamber, a top sealing disk is inserted into the hydraulic oil chamber at the lower end of the top cover, and the inner and outer peripheral sides of the top sealing disk are in contact with the blowout preventer base and one side of the lifting piston seat respectively;

[0007] A state monitoring component, wherein the state monitoring component is arranged in the monitoring retaining ring, and the monitoring component includes a plurality of annular pressure sensing modules, and a plurality of guide air pipes are vertically arranged on one side of the lifting piston seat, and the plurality of guide air pipes respectively penetrate the plurality of annular pressure sensing modules;

[0008] A sealing reinforcement component, wherein two movable sealing sleeves are symmetrically arranged on both sides of the lifting piston seat inserted into the hydraulic oil chamber, the sealing reinforcement component is arranged on one side of the lifting piston seat close to the movable sealing sleeve, and the sealing reinforcement component includes an expansion gas ring.

[0009] Preferably, a sleeve groove is provided on one side of the lower end of the lifting piston seat, and the lifting piston seat is vertically movable through the sleeve groove to sleeve a monitoring retaining ring. An installation tray is horizontally provided at the upper end of the lifting piston seat in the top cover, and a rubber core is provided on the installation tray, and the upper end of the rubber core is in contact with the upper end of the top cover.

[0010] Preferably, the lifting piston seat is arranged in an "S"-shaped structure, and a sealing ring is provided on the side of the lifting piston seat that contacts the monitoring retaining ring and the blowout preventer base.

[0011] Preferably, the upper and lower ends of one side of the hydraulic oil chamber are respectively connected to the first hydraulic joint and the second hydraulic joint. When not in use, the first hydraulic joint and the second hydraulic joint are blocked by bolts, and the lifting piston seat is placed on one side of the hydraulic oil chamber and is horizontally located between the first hydraulic joint and the second hydraulic joint.

[0012] Preferably, a plurality of monitoring grooves are vertically opened in the monitoring retaining ring, and sealing guide holes are penetrated through the upper ends of the plurality of monitoring grooves. A plurality of guide air pipes are vertically arranged in the sleeve grooves, and the lower ends of the plurality of guide air pipes are movably penetrated through the sealing guide holes and inserted into the monitoring grooves.

[0013] Preferably, a pressure block is vertically movable at the lower end of the monitoring slide groove, and the pressure block is sleeved with a guide air pipe. A high-strength assembly bolt is horizontally inserted through one side of the pressure block that is sleeved with the guide air pipe. The annular pressure sensing module is horizontally arranged at the upper end of the monitoring slide groove, and when the lifting piston seat rises to the maximum extent, the lower end of the annular pressure sensing module contacts the upper end of the pressure block.

[0014] Preferably, an annular air groove is opened at the lower end of the monitoring retaining ring, and the lower ends of several monitoring slide grooves are connected to the annular air groove. The pressure block is provided with a side with a high-strength assembly bolt inserted into the annular air groove, and the side of the annular air groove close to the high-strength assembly bolt is horizontally penetrated with an operating through hole.

[0015] Preferably, two first annular grooves are provided on one side of the lifting piston seat close to the monitoring retaining ring and the side wall of the blowout preventer base, and four movable sealing sleeves are horizontally inserted into the four first annular grooves, and the four movable sealing sleeves are respectively in extrusion contact with the side wall of the blowout preventer base and the side wall of the monitoring retaining ring.

[0016] Preferably, a diverter air groove is opened in the lifting piston seat, a second annular groove is opened on the side of the first annular groove close to the diverter air groove, the expansion air ring is inserted into the second annular groove, the outer peripheral side of the expansion air ring is abutted against the inner peripheral side of the movable sealing sleeve, and an air pipe is provided between the expansion air ring and the diverter air groove.

[0017] Preferably, the upper ends of the guide air pipes are connected to the diversion air grooves, and the diameter of the high-strength assembly bolts penetrating the guide air pipes is smaller than the inner cavity diameter of the guide air pipes.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] A status monitoring component is arranged in the monitoring and retaining ring of the blowout preventer base, and then a guide air pipe is arranged through the lifting piston seat, so that it is used correspondingly with the annular pressure sensing module through the pressure block. When the lifting piston seat controls the rubber core to seal the tube bundle, the annular pressure sensing module monitors the lifting pressure of the lifting piston seat in real time to maintain the sealing state of the rubber core clamping the tube bundle. When the monitored pressure is abnormal, the movable sealing sleeve position of the lifting piston seat can be strengthened and sealed through the sealing strengthening component. The pressure of the lifting piston seat is stably maintained during use, and timely response can be made to improve the safety of construction operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the side cutting structure of the present invention;

[0022] Figure 3 For the present invention Figure 2 Schematic diagram of part A;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of part B;

[0024] Figure 5 For the present invention Figure 3 Schematic diagram of the C part;

[0025] Figure 6 For the present invention Figure 3 Schematic diagram of the D part;

[0026] Figure 7 This is a schematic diagram of the structure of the lifting piston seat of the present invention;

[0027] Figure 8 For the present invention Figure 7 Schematic diagram of part E.

[0028] In the figure: blowout preventer base 1, top cover 2, monitoring retaining ring 3, hydraulic oil chamber 4, top sealing plate 5, mounting tray 6, rubber core 7, lifting piston seat 8, sleeve groove 9, first annular groove 10, movable sealing sleeve 11, guide air pipe 12, monitoring slide groove 13, annular air groove 14, operation perforation 15, pressing block 16, high-strength assembly bolt 17, annular pressure sensor module 18, diverter air groove 19, second annular groove 20, expansion air ring 21, connecting air pipe 22, first hydraulic joint 23, second hydraulic joint 24. DETAILED DESCRIPTION

[0029] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-Figure 8 , the present invention provides the following technical solutions:

[0031] Embodiment 1: An annular blowout preventer for an oilfield wellhead comprises a blowout preventer base 1, a top cover 2 is fixedly provided at the upper end of the blowout preventer base 1 by bolts, a monitoring retaining ring 3 is vertically provided at the center of the blowout preventer base 1, a hydraulic oil chamber 4 is clamped between the outer peripheral side of the monitoring retaining ring 3 and the side wall of the blowout preventer base 1, a lifting piston seat 8 is vertically movably inserted in the blowout preventer base 1, one side of the lifting piston seat 8 is inserted in the hydraulic oil chamber 4, a top sealing disk 5 is inserted in the hydraulic oil chamber 4 at the lower end of the top cover 2, and the inner and outer peripheral sides of the top sealing disk 5 are respectively in contact with the blowout preventer base 1 and one side of the lifting piston seat 8, a sleeve groove 9 is provided on one side of the lower end of the lifting piston seat 8, and the lifting piston seat 8 is vertically movably sleeved through the sleeve groove 9 A monitoring retaining ring 3 is provided, and a mounting tray 6 is horizontally provided at the upper end of the lifting piston seat 8 in the top cover 2. A rubber core 7 is provided on the mounting tray 6, and the upper end of the rubber core 7 is in contact with the upper end of the top cover 2. The lifting piston seat 8 is arranged in an "S"-shaped structure. A sealing ring is provided on the side of the lifting piston seat 8 in contact with the monitoring retaining ring 3 and the blowout preventer base 1. One side of the lifting piston seat 8 in the hydraulic oil chamber 4 is a U-shaped structure. When the lifting piston seat 8 rises to the maximum extent through hydraulic pressure, the lower end of the top sealing disk 5 fits with the upper end of the lifting piston seat 8 placed in the hydraulic oil chamber 4. At this time, after the mounting tray 6 is lifted, the rubber core 7 is squeezed and deformed, so that it can be used for blowout prevention of the pipe bundle passing through the blowout preventer base 1 and the top cover 2.

[0032] The upper and lower ends of one side of the hydraulic oil chamber 4 are respectively connected to the first hydraulic joint 23 and the second hydraulic joint 24. When not in use, the first hydraulic joint 23 and the second hydraulic joint 24 are blocked by bolts. The lifting piston seat 8 is placed on one side of the hydraulic oil chamber 4 and is horizontally located between the first hydraulic joint 23 and the second hydraulic joint 24. The lifting piston seat 8 is inserted into the hydraulic oil chamber 4 on both sides and is symmetrically provided with two movable sealing sleeves 11. The first hydraulic joint 23 and the second hydraulic joint 24 are used to deliver hydraulic oil to control the lifting and lowering of the lifting piston seat 8. The movable sealing sleeve 11 is used to separate the hydraulic oil chamber 4 connected by the first hydraulic joint 23 and the second hydraulic joint 24 when the lifting piston seat 8 is lifted.

[0033] A status monitoring component is set to monitor the supporting pressure of the lifting piston seat 8 after lifting. The status monitoring component is arranged in the monitoring retaining ring 3. The monitoring component includes a plurality of annular pressure sensing modules 18. A plurality of guide air pipes 12 are vertically arranged on one side of the lifting piston seat 8. The plurality of guide air pipes 12 respectively penetrate the plurality of annular pressure sensing modules 18. A plurality of monitoring slide grooves 13 are vertically opened in the monitoring retaining ring 3. The upper ends of the plurality of monitoring slide grooves 13 are penetrated with sealing guide holes. The plurality of guide air pipes 12 are vertically arranged in the sleeve groove 9 respectively. The lower ends of the plurality of guide air pipes 12 are respectively movable through the sealing guide holes and inserted into the monitoring slide grooves 13. The lower ends of the monitoring slide grooves 13 are vertically movable with pressure-resistant ... Block 16, the pressure block 16 is sleeved with the guide air pipe 12, and a high-strength assembly bolt 17 is horizontally inserted and inserted on one side of the pressure block 16 sleeved with the guide air pipe 12. The annular pressure sensing module 18 is horizontally arranged at the upper end of the monitoring slide groove 13, and when the lifting piston seat 8 rises to the maximum extent, the lower end of the annular pressure sensing module 18 contacts the upper end of the pressure block 16. When the lifting piston seat 8 is lifted to the maximum, the pressure of the rubber core 7 being squeezed to contact the tube bundle reaches the maximum, and then the anti-blowout effect of the rubber core 7 is the best at this time. When the annular pressure sensing module 18 finds that the contact pressure of the pressure block 16 with it becomes weak, it can be explained that the hydraulic oil sent into the hydraulic oil chamber 4 below by the second hydraulic joint 24 may leak.

[0034] An annular air groove 14 is provided at the lower end of the monitoring retaining ring 3, and the lower ends of several monitoring slide grooves 13 are connected to the annular air groove 14. The side of the pressure block 16 with a high-strength assembly bolt 17 is inserted into the annular air groove 14, and the side of the annular air groove 14 close to the high-strength assembly bolt 17 is horizontally penetrated with an operating through-hole 15. When the pressure block 16 and the guide air pipe 12 are assembled, the high-strength assembly bolt 17 can be rotated and controlled through the operating through-hole 15, so that the high-strength assembly bolt 17 combines the pressure block 16 and the guide air pipe 12 into a whole. Then, when the device is used normally, one of the operating through-holes 15 can be connected to the high-pressure gas, and the other ones are sealed by bolts.

[0035] The provision of the guide air pipe 12 can also improve the stability of the lifting and lowering movement of the lifting piston seat 8 and avoid lateral tilting and swinging.

[0036] Embodiment 2: On the basis of embodiment 1, a sealing reinforcement component is provided to carry out timely emergency reinforcement treatment when the movable sealing structure of the lifting piston seat 8 is damaged and leaks. The sealing reinforcement component is provided on a side of the lifting piston seat 8 close to the movable sealing sleeve 11, and the sealing reinforcement component includes an expansion gas ring 21. Two first annular grooves 10 are provided on one side of the lifting piston seat 8 close to the monitoring retaining ring 3 and the side wall of the blowout preventer base 1. Four movable sealing sleeves 11 are horizontally inserted into the four first annular grooves 10 respectively, and the four movable sealing sleeves 11 are respectively squeezed and contacted with the side wall of the blowout preventer base 1 and the side wall of the monitoring retaining ring 3. The setting position of the movable sealing sleeve 11 is to ensure that the hydraulic oil at the bottom of the hydraulic oil chamber 4 will not leak through the position of the lifting piston seat 8 or flow into the top of the hydraulic oil chamber 4. The contact position of the top sealing disk 5 and the lifting piston seat 8 can be installed with a sealing rubber ring according to normal operating standards, because the hydraulic pressure at the top of the hydraulic oil chamber 4 will not be too high.

[0037] A shunt gas groove 19 is provided in the lifting piston seat 8, and a second annular groove 20 is provided on one side of the first annular groove 10 near the shunt gas groove 19. An expansion gas ring 21 is inserted into the second annular groove 20, and the outer peripheral side of the expansion gas ring 21 abuts against the inner peripheral side of the movable sealing sleeve 11, and a connecting air pipe 22 is provided between the expansion gas ring 21 and the shunt gas groove 19. The upper ends of the guide air pipes 12 are connected to the shunt gas groove 19, and the diameter of the high-strength assembly bolts 17 penetrating the guide air pipe 12 is smaller than the inner cavity diameter of the guide air pipe 12. If the hydraulic oil flows into the upper part of the hydraulic oil chamber 4 due to wear of the movable sealing sleeve 11, the high-pressure gas enters the annular gas groove 14 through the operating perforation 15, and then the high-pressure gas enters the shunt gas groove 19 through the guide air pipe 12, and finally enters the four expansion gas rings 21. After the expansion gas ring 21 expands, the movable sealing sleeve 11 and the side walls of the blowout preventer base 1 and the monitoring retaining ring 3 are strengthened and squeezed and sealed.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An annular blowout preventer for an oil field wellhead, characterized in that: include: A blowout preventer base (1), wherein a top cover (2) is fixedly provided at the upper end of the blowout preventer base (1) by bolts, a monitoring retaining ring (3) is vertically provided at the center of the blowout preventer base (1), a hydraulic oil chamber (4) is sandwiched between the outer peripheral side of the monitoring retaining ring (3) and the side wall of the blowout preventer base (1), a lifting piston seat (8) is vertically movably inserted in the blowout preventer base (1), one side of the lifting piston seat (8) is inserted into the hydraulic oil chamber (4), a top sealing disc (5) is inserted into the hydraulic oil chamber (4) at the lower end of the top cover (2), and the inner and outer peripheral sides of the top sealing disc (5) are in contact with the blowout preventer base (1) and one side of the lifting piston seat (8) respectively; A state monitoring component, the state monitoring component is arranged in a monitoring retaining ring (3), the monitoring component comprises a plurality of annular pressure sensing modules (18), a plurality of guide air pipes (12) are vertically arranged on one side of the lifting piston seat (8), and the plurality of guide air pipes (12) respectively penetrate the plurality of annular pressure sensing modules (18); A sealing reinforcement component, wherein two movable sealing sleeves (11) are symmetrically arranged on both sides of the lifting piston seat (8) inserted into the hydraulic oil chamber (4), the sealing reinforcement component is arranged on a side of the lifting piston seat (8) close to the movable sealing sleeve (11), and the sealing reinforcement component includes an expansion gas ring (21).

2. The annular blowout preventer for oil field wellhead according to claim 1, characterized in that: A sleeve groove (9) is provided on one side of the lower end of the lifting piston seat (8), and the lifting piston seat (8) is vertically movably sleeved with the monitoring retaining ring (3) through the sleeve groove (9). A mounting tray (6) is horizontally provided at the upper end of the lifting piston seat (8) in the top cover (2), and a rubber core (7) is provided on the mounting tray (6), and the upper end of the rubber core (7) is in contact with the upper end of the top cover (2).

3. The annular blowout preventer for oil field wellhead according to claim 2, characterized in that: The lifting piston seat (8) is arranged in an "S"-shaped structure, and a sealing ring is arranged on the side of the lifting piston seat (8) that contacts the monitoring retaining ring (3) and the blowout preventer base (1).

4. The annular blowout preventer for oil field wellhead according to claim 3, characterized in that: The upper and lower ends of one side of the hydraulic oil chamber (4) are respectively connected to a first hydraulic joint (23) and a second hydraulic joint (24); when not in use, the first hydraulic joint (23) and the second hydraulic joint (24) are sealed by bolts; the lifting piston seat (8) is placed on one side of the hydraulic oil chamber (4) and is horizontally located between the first hydraulic joint (23) and the second hydraulic joint (24).

5. The annular blowout preventer for oil field wellhead according to claim 4, characterized in that: A plurality of monitoring slide grooves (13) are vertically opened in the monitoring retaining ring (3), and sealing guide holes are opened through the upper ends of the plurality of monitoring slide grooves (13). A plurality of guide air pipes (12) are respectively vertically opened in the sleeve groove (9), and the lower ends of the plurality of guide air pipes (12) are respectively movably opened through the sealing guide holes and inserted into the monitoring slide grooves (13).

6. The annular blowout preventer for oil field wellhead according to claim 5, characterized in that: The lower end of the monitoring chute (13) is vertically movable with a pressure block (16), which is sleeved with the guide air pipe (12). A high-strength assembly bolt (17) is horizontally inserted through one side of the pressure block (16) sleeved with the guide air pipe (12). An annular pressure sensing module (18) is horizontally arranged at the upper end of the monitoring chute (13), and when the lifting piston seat (8) rises to the maximum extent, the lower end of the annular pressure sensing module (18) contacts the upper end of the pressure block (16).

7. The annular blowout preventer for oil field wellhead according to claim 6, characterized in that: An annular air groove (14) is provided at the lower end of the monitoring retaining ring (3), and the lower ends of a plurality of monitoring slide grooves (13) are connected to the annular air groove (14). A side of the pressure block (16) provided with a high-strength assembly bolt (17) is inserted into the annular air groove (14), and an operation through hole (15) is provided horizontally through the side of the annular air groove (14) close to the high-strength assembly bolt (17).

8. The annular blowout preventer for oil field wellhead according to claim 7, characterized in that: Two first annular grooves (10) are provided on one side of the lifting piston seat (8) close to the monitoring retaining ring (3) and the side wall of the blowout preventer base (1), and four movable sealing sleeves (11) are respectively inserted horizontally into the four first annular grooves (10), and the four movable sealing sleeves (11) are respectively in extrusion contact with the side wall of the blowout preventer base (1) and the side wall of the monitoring retaining ring (3).

9. The annular blowout preventer for oil field wellhead according to claim 8, characterized in that: A diverter gas groove (19) is provided in the lifting piston seat (8), a second annular groove (20) is provided on a side of the first annular groove (10) close to the diverter gas groove (19), an expansion gas ring (21) is inserted into the second annular groove (20), the outer peripheral side of the expansion gas ring (21) is in contact with the inner peripheral side of the movable sealing sleeve (11), and a connecting air pipe (22) is provided between the expansion gas ring (21) and the diverter gas groove (19).

10. The annular blowout preventer for oil field wellhead according to claim 9, characterized in that: The upper ends of the guide air pipes (12) are connected to the diverter air grooves (19), and the diameter of the high-strength assembly bolts (17) penetrating the guide air pipes (12) is smaller than the inner cavity diameter of the guide air pipes (12).

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