Emergency shut-off device for offshore wellhead plate

Abstract

The utility model discloses an emergency shut-off device for an offshore wellhead disc, which relates to the technical field of offshore oil exploration and development and aims to solve the problem that interlocking shut-off between two wellhead control discs on the same platform cannot be realized. The emergency shut-off device comprises two sets of control discs, and any set of control disc comprises an air source pressure loop connected with an air source; the gas source pressure loop is connected with the pressure reduction loop, a first turn-off loop is arranged behind the pressure reduction loop, the first turn-off loop is a 1 / 2-stage emergency turn-off loop, a first turn-off relay valve, a first turn-off hand pull valve and a first turn-off electromagnetic valve are arranged on the first turn-off loop, the first turn-off hand pull valve and the first turn-off electromagnetic valve are used for controlling the turn-on and turn-off of the first turn-off relay valve, and the two sets of control panels are connected in series through the first turn-off relay valve and a pipeline. A second turn-off loop is arranged behind the first turn-off loop, the second turn-off loop is a three-stage emergency turn-off loop, a second turn-off relay valve, a second turn-off hand pull valve and a second turn-off electromagnetic valve are arranged on the second turn-off loop, the second turn-off hand pull valve and the second turn-off electromagnetic valve are used for controlling on-off of the second turn-off relay valve, and the two sets of control panels are connected in series through the second turn-off relay valve and the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of offshore oil exploration and development, and more specifically to an offshore wellhead emergency shut-off device. Background Art

[0002] During the exploration and development of oil and gas, when overflow, well gushing or blowout occurs at the wellhead, relevant personnel such as instrument workers need to operate the independent controllers of each object to close the wellhead of the oil and gas well to avoid blowout accidents. Under normal circumstances, instrument workers can implement well shut-in according to the well shut-in procedures for each working condition in the well control implementation rules. However, since each object is controlled by multiple sets of independent control equipment, if an emergency occurs, once the instrument worker is affected by psychological quality or other factors, it may lead to the situation that the well shut-in operation cannot be implemented according to the well shut-in procedure, which may cause economic losses and casualties, and the safety and reliability of the system cannot be guaranteed.

[0003] With the maturity of offshore oil exploration and development technology, most single offshore oil and gas platforms will have more than 30 production wells. Currently, a single wellhead control panel is conventionally designed to control up to 24 wells. Therefore, most platforms will be equipped with two wellhead control panels. The two wellhead control panels are independently controlled and are respectively equipped with a fusible plug control circuit and an emergency manual alarm station control circuit. In actual applications, it can be observed on site whether the fusible plug control circuit and the emergency manual alarm station control circuit are in a shielded state, but it is not possible to remotely determine whether the fusible plug and the emergency shutdown device manual alarm station circuit are in a shielded state through the central control. Moreover, the two sets of wellhead control panels on the same platform are independently controlled, and all wells cannot be closed by one device.

[0004] Therefore, how to solve the problem that the interlocking shutdown between two wellhead control panels on the same platform cannot be achieved is an urgent problem to be solved by technical personnel in this field. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide an offshore wellhead panel emergency shutdown device, which can realize the interlocking shutdown function between two wellhead control panels on the same platform.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] An offshore wellhead emergency shut-off device comprises two sets of control panels, wherein any one set of control panels comprises an air source pressure circuit connected to an air source, the air source pressure circuit is connected to a pressure reducing circuit for reducing pressure and controlling gas pressure, a first shut-off circuit is arranged behind the pressure reducing circuit, the first shut-off circuit is a 1 / 2-stage emergency shut-off circuit, a first shut-off relay valve and a first shut-off hand-pull valve and a first shut-off solenoid valve for controlling the on-off thereof are arranged on the first shut-off circuit, the 1 / 2-stage emergency shut-off circuits of the two sets of control panels are connected in series with pipelines via the first shut-off relay valve, a second shut-off circuit is arranged behind the first shut-off circuit, the second shut-off circuit is a 3-stage emergency shut-off circuit, a second shut-off relay valve and a second shut-off hand-pull valve and a second shut-off solenoid valve for controlling the on-off thereof are arranged on the second shut-off circuit, the 3-stage emergency shut-off circuits of the two sets of control panels are connected in series with pipelines via the second shut-off relay valve.

[0008] Preferably, a first branch connected to the pressure reducing circuit is provided, the first branch is a 1 / 2 level emergency shut-off branch, a first pressure indicator and a first pressure transmitter are provided on the first branch, a first pressure indicator is provided with a normally open first pressure indicator isolation needle valve, and the first pressure transmitter is provided with a normally open first pressure transmitter isolation needle valve.

[0009] Preferably, a second branch connected to the pressure reducing circuit is provided, the second branch is a level 3 emergency shutdown branch, a second pressure indicator and a second pressure transmitter are provided on the second branch, the second pressure indicator is provided with a normally open second pressure indicator isolation needle valve, and the second pressure transmitter is provided with a normally open second pressure transmitter isolation needle valve.

[0010] Preferably, the air source pressure circuit is provided with an air source pressure measuring assembly for monitoring the air source pressure, the air source pressure measuring assembly includes an air source pressure gauge and an air source pressure transmitter, the air source pressure gauge is provided with a normally open air source pressure gauge isolation needle valve, and the air source pressure transmitter is provided with a normally open air source pressure transmitter isolation needle valve.

[0011] Preferably, the pressure reducing circuit is provided with a first-level pressure reducing valve inlet ball valve and a first-level pressure reducing valve spare inlet ball valve connected in parallel, the first-level pressure reducing valve inlet ball valve is connected in series with the first-level pressure reducing valve and the first-level pressure reducing valve outlet ball valve, and the first-level pressure reducing valve spare inlet ball valve is connected in series with the spare first-level pressure reducing valve and the first-level pressure reducing valve spare outlet ball valve.

[0012] Preferably, a first-level pressure measuring assembly is also provided on the pressure reducing circuit, and the first-level pressure measuring assembly includes a wellhead control panel working gas pressure gauge and a one-way valve. The wellhead control panel working gas pressure gauge is provided with a normally open wellhead control panel working gas pressure gauge isolation needle valve.

[0013] Preferably, the pressure reducing circuit is also provided with a pilot pressure regulating valve inlet ball valve and a pilot pressure regulating valve spare inlet ball valve connected in parallel; the pilot pressure regulating valve inlet ball valve is connected in series with the pilot pressure regulating valve and the pilot pressure regulating valve outlet ball valve; the pilot pressure regulating valve spare inlet ball valve is connected in series with the spare pilot pressure regulating valve and the pilot pressure regulating valve spare outlet ball valve.

[0014] Preferably, the pressure reducing circuit is further provided with a secondary pressure measuring assembly, which includes a pilot relief valve and a pilot pressure gauge, and the pilot pressure gauge is provided with a normally open pilot pressure gauge isolation needle valve.

[0015] Preferably, one set of control panels also includes an inflation circuit and a shielding circuit connected to the pressure reducing circuit, the inflation circuit is followed by a fusible plug circuit, the shielding circuit is followed by an emergency manual alarm station circuit, the fusible plug circuit and the emergency manual alarm station circuit are connected in parallel, a fusible plug pressure measuring assembly for detecting the pressure of the fusible plug circuit is provided on the fusible plug circuit, and an emergency manual alarm station pressure measuring assembly for detecting the pressure of the emergency manual alarm station circuit is provided on the emergency manual alarm station circuit.

[0016] Preferably, a button valve and a one-way valve are also provided on the inflation circuit, a relay valve and a throttle hole joint are also connected in parallel on the inflation circuit, and a shielding ball valve, a shielding pressure transmitter, a shielding pressure transmitter isolation needle valve and a shielding shuttle valve are also provided on the shielding circuit.

[0017] The offshore wellhead emergency shutdown device provided by the utility model includes two sets of control panels, and any set of control panels includes a gas source pressure circuit connected to the gas source, so that the gas source pressure circuit can be connected to the gas source to ensure the supply of gas, and the gas source pressure circuit is connected to a pressure reducing circuit for reducing and controlling the gas pressure. By setting the pressure reducing circuit, the gas is decompressed to adjust and control the gas pressure.

[0018] After the pressure reducing circuit is the first shut-off circuit, which is a 1 / 2-level emergency shut-off circuit. The first shut-off circuit is provided with a first shut-off relay valve and a first shut-off hand-pull valve and a first shut-off solenoid valve for controlling its on and off. The 1 / 2-level emergency shut-off circuits of the two control panels are connected in series through the first shut-off relay valve and the pipeline. By remotely shutting off the first shut-off solenoid valve of any control panel or manually pushing down the first shut-off hand-pull valve of any control panel, the hydraulic control circuits of all safety valves of the two devices can be shut off.

[0019] The first shut-off circuit is followed by the second shut-off circuit, which is a level 3 emergency shut-off circuit. The second shut-off circuit is provided with a second shut-off relay valve and a second shut-off hand-pull valve and a second shut-off solenoid valve for controlling its on and off. The level 3 emergency shut-off circuits of the two control panels are connected in series through the second shut-off relay valve and the pipeline. By remotely shutting off the second shut-off solenoid valve of any control panel or manually pushing down the second shut-off hand-pull valve of any control panel, the hydraulic control circuits of all well safety valves of the two equipment can be shut off.

[0020] The offshore wellhead emergency shutdown device arranged in the above manner can realize the interlocking shutdown function between two wellhead control panels on the same platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the structure of one set of control panels of the offshore wellhead emergency shutdown device provided by the utility model;

[0023] Figure 2 This is a structural schematic diagram of another set of control panels of the offshore wellhead emergency shutdown device provided by the utility model;

[0024] Figure 3 A schematic diagram of the partial structure of the 1 / 2 level emergency shutdown circuit provided by the utility model;

[0025] Figure 4 A schematic diagram of the partial structure of the three-level emergency shutdown circuit provided by the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of the air source pressure measuring assembly provided by the utility model;

[0027] Figure 6 This is a structural schematic diagram of the primary pressure measuring assembly provided by the utility model;

[0028] Figure 7 This is a schematic diagram of the structure of the secondary pressure measuring assembly provided by the utility model;

[0029] Figure 8 A schematic diagram of the partial structure of the fusible plug circuit provided by the utility model;

[0030] Fig. 9The utility model is a partial structural diagram of the emergency manual alarm station circuit provided by the utility model.

[0031] Reference numerals:

[0032] 1-First shut-off relay valve;

[0033] 2- First shut-off hand-pull valve;

[0034] 3- First shut-off solenoid valve;

[0035] 4-Second shut-off relay valve;

[0036] 5-Second shut-off hand-pull valve;

[0037] 6-Second shut-off solenoid valve;

[0038] 7-First pressure indicator;

[0039] 8- first pressure transmitter;

[0040] 9-First pressure indicator isolation needle valve;

[0041] 10-Isolation needle valve of the first pressure transmitter;

[0042] 11- Second pressure indicator;

[0043] 12- Second pressure transmitter;

[0044] 13-Second pressure indicator isolation needle valve;

[0045] 14-Second pressure transmitter isolation needle valve;

[0046] 15-gas source pressure measuring assembly;

[0047] 16-gas source pressure gauge;

[0048] 17-Gas source pressure transmitter;

[0049] 18-gas source pressure gauge isolation needle valve;

[0050] 19-Isolation needle valve of air source pressure transmitter;

[0051] 20-First-stage pressure reducing valve inlet ball valve;

[0052] 21- Spare imported ball valve for first-stage pressure reducing valve;

[0053] 22-First-stage pressure reducing valve;

[0054] 23-First-stage pressure reducing valve outlet ball valve;

[0055] 24- Spare first-stage pressure reducing valve;

[0056] 25- Spare outlet ball valve for first-stage pressure reducing valve;

[0057] 26- primary pressure measuring assembly;

[0058] 27- Working gas pressure gauge of wellhead control panel;

[0059] 28- first one-way valve;

[0060] 29-Isolation needle valve of working gas pressure gauge of wellhead control panel;

[0061] 30-pilot pressure regulating valve inlet ball valve;

[0062] 31- Spare imported ball valve for pilot pressure regulating valve;

[0063] 32-pilot pressure regulating valve;

[0064] 33-pilot pressure regulating valve outlet ball valve;

[0065] 34- Spare pilot pressure regulating valve;

[0066] 35- Spare outlet ball valve for pilot pressure regulating valve;

[0067] 36-secondary pressure measuring assembly;

[0068] 37-pilot relief valve;

[0069] 38-Pilot pressure gauge;

[0070] 39-Pilot pressure gauge isolation needle valve;

[0071] 40-fusible plug pressure measuring assembly;

[0072] 41- Emergency manual alarm station pressure measuring assembly;

[0073] 42-Fusible plug circuit check valve;

[0074] 43-Fusible plug circuit pressure gauge;

[0075] 44-fusible plug circuit pressure transmitter;

[0076] 45-Emergency manual alarm station;

[0077] 46-Fusible plug circuit pressure gauge isolation needle valve;

[0078] 47-Fusible plug circuit pressure transmitter isolation needle valve;

[0079] 48- Emergency manual alarm station circuit check valve;

[0080] 49- Emergency manual alarm station circuit pressure gauge;

[0081] 50- Emergency manual alarm station loop pressure transmitter;

[0082] 51-fusible plug;

[0083] 52- Emergency manual alarm station circuit pressure gauge isolation needle valve;

[0084] 53- Emergency manual alarm station loop pressure transmitter isolation needle valve;

[0085] 54-button valve;

[0086] 55 - second one-way valve;

[0087] 56-Relay valve;

[0088] 57-throttle joint;

[0089] 58-shielded ball valve;

[0090] 59-shielded pressure transmitter;

[0091] 60-Shielded pressure transmitter isolation needle valve;

[0092] 61-Shielded shuttle valve. DETAILED DESCRIPTION

[0093] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the utility model.

[0094] The core of the utility model is to provide an offshore wellhead panel emergency shut-off device, which can realize the interlocking shut-off function between two wellhead control panels on the same platform.

[0095] Please refer to Figure 1 and Figure 2 An offshore wellhead emergency shutdown device includes two sets of control panels. Any set of control panels includes a gas source pressure circuit connected to a gas source, so that the gas source pressure circuit can be connected to the gas source to ensure the supply of gas. The gas source pressure circuit is connected to a pressure reducing circuit for reducing and controlling gas pressure. By setting the pressure reducing circuit, the gas is decompressed to adjust and control the gas pressure.

[0096] After the pressure reducing circuit is the first shut-off circuit, which is a 1 / 2 level emergency shut-off circuit. The first shut-off circuit is provided with a first shut-off relay valve 1 and a first shut-off hand-pull valve 2 and a first shut-off solenoid valve 3 for controlling the on and off thereof. The 1 / 2 level emergency shut-off circuits of the two control panels are connected in series through the first shut-off relay valve 1 and the pipeline. By remotely shutting off the first shut-off solenoid valve 3 of any control panel or manually pushing down the first shut-off hand-pull valve 2 of any control panel, the hydraulic control circuits of all safety valves of the two devices can be shut off.

[0097] The first shut-off circuit is followed by the second shut-off circuit, which is a level 3 emergency shut-off circuit. The second shut-off circuit is provided with a second shut-off relay valve 4 and a second shut-off hand-pull valve 5 and a second shut-off solenoid valve 6 for controlling the on and off thereof. The level 3 emergency shut-off circuits of the two control panels are connected in series through the second shut-off relay valve and the pipeline. By remotely shutting off the second shut-off solenoid valve 6 of any control panel or manually pushing down the second shut-off hand-pull valve 5 of any control panel, the hydraulic control circuits of all wellbore safety valves of the two equipment can be shut off.

[0098] The offshore wellhead emergency shutdown device arranged in the above manner can realize the interlocking shutdown function between two wellhead control panels on the same platform.

[0099] Please refer to Figure 3 A first branch connected to the pressure reducing circuit is also provided. The first branch is a 1 / 2 level emergency shut-off branch. A first pressure indicator 7 and a first pressure transmitter 8 are provided on the first branch. The first pressure indicator 7 is provided with a normally open first pressure indicator isolation needle valve 9. The first pressure transmitter 8 is provided with a normally open first pressure transmitter isolation needle valve 10.

[0100] It should be noted that the first pressure indicator 7 is used to measure the pressure of the gas on the 1 / 2 level emergency shutdown branch, and the first pressure transmitter 8 converts the gas pressure parameter measured by the first pressure indicator 7 into a standard electrical signal and transmits it to the alarm device, etc.

[0101] Among them, the first pressure indicator isolation needle valve 9 and the first pressure transmitter isolation needle valve 10 are in the normally open state, so that the 1 / 2 level emergency shut-off branch is in the passage state. When the first pressure indicator 7 and the first pressure transmitter 8 need to be repaired, the first pressure indicator isolation needle valve 9 and the first pressure transmitter isolation needle valve 10 are closed to make the 1 / 2 level emergency shut-off branch in the open circuit state for safe maintenance work.

[0102] Please refer to Figure 4A second branch connected to the pressure reducing circuit is also provided. The second branch is a level 3 emergency shutdown branch. A second pressure indicator 11 and a second pressure transmitter 12 are also provided on the second branch. The second pressure indicator 11 is provided with a normally open second pressure indicator isolation needle valve 13. The second pressure transmitter 12 is provided with a normally open second pressure transmitter isolation needle valve 14.

[0103] It can be understood that the second pressure indicator 11 is used to measure the pressure of the gas on the level 3 emergency shutdown branch, and the second pressure transmitter 12 converts the gas pressure parameter measured by the second pressure indicator 11 into a standard electrical signal and transmits it to an alarm device, etc.

[0104] Among them, the second pressure indicator isolation needle valve 13 and the second pressure transmitter isolation needle valve 14 are in a normally open state, so that the 3rd level emergency shutdown branch is in a pass state. When the second pressure indicator 11 and the second pressure transmitter 12 need to be repaired, the second pressure indicator isolation needle valve 13 and the second pressure transmitter isolation needle valve 14 are closed to make the 3rd level emergency shutdown branch in an open circuit state for safe maintenance work.

[0105] Please refer to Figure 5 The air source pressure circuit is provided with an air source pressure measuring assembly 15 for monitoring the air source pressure. The air source pressure measuring assembly 15 includes an air source pressure gauge 16 and an air source pressure transmitter 17. The air source pressure gauge 16 is provided with a normally open air source pressure gauge isolation needle valve 18, and the air source pressure transmitter 17 is provided with a normally open air source pressure transmitter isolation needle valve 19.

[0106] It should be noted that the gas source pressure gauge 16 is used to measure the pressure of the gas on the gas source pressure loop, and the gas source pressure transmitter 17 converts the gas pressure parameter measured by the gas source pressure gauge 16 into a standard electrical signal and transmits it to the alarm, etc. The gas source pressure loop is provided with a gas source pressure measuring component 1 for monitoring the pressure of the gas source pressure loop, so as to display the pressure state of the gas in the gas source pressure loop in real time.

[0107] Among them, the air source pressure transmitter isolation needle valve 19 is in a normally open state to make the air source pressure circuit in a passage state. When the air source pressure transmitter 17 needs to be repaired, the air source pressure transmitter isolation needle valve 19 is closed to make the air source pressure circuit in a circuit-breaking state for safe maintenance work.

[0108] The pressure reducing circuit includes a primary pressure reducing circuit and a secondary pressure reducing circuit. The gas source pressure circuit is connected in series with the primary pressure reducing circuit. The primary pressure reducing circuit is provided with a primary pressure measuring component 26 for monitoring the pressure of the primary pressure reducing circuit. The primary pressure reducing circuit is connected in series with the secondary pressure reducing circuit. The secondary pressure reducing circuit is provided with a secondary pressure measuring component 36 for monitoring the pressure of the secondary pressure reducing circuit. By setting the primary pressure reducing circuit and the secondary pressure reducing circuit, the gas is decompressed. The primary pressure measuring component 26 and the secondary pressure measuring component 36 are provided to display the pressure of the gas in real time. The pressure of the gas is adjusted and controlled by cooperating with the primary pressure reducing circuit and the secondary pressure reducing circuit.

[0109] Furthermore, a first-level pressure reducing circuit is provided with a first-level pressure reducing valve inlet ball valve 20 and a first-level pressure reducing valve spare inlet ball valve 21 connected in parallel; the first-level pressure reducing valve inlet ball valve 20 is connected in series with the first-level pressure reducing valve 22 and the first-level pressure reducing valve outlet ball valve 23; the first-level pressure reducing valve spare inlet ball valve 21 is connected in series with the spare first-level pressure reducing valve 24 and the first-level pressure reducing valve spare outlet ball valve 25.

[0110] It can be understood that the branch where the first-level pressure reducing valve inlet ball valve 20, the first-level pressure reducing valve 22 and the first-level pressure reducing valve outlet ball valve 23 are located is the main branch, and the branch where the first-level pressure reducing valve standby inlet ball valve 21, the standby first-level pressure reducing valve 24 and the first-level pressure reducing valve standby outlet ball valve 25 are located is the standby branch. When working, generally, the first-level pressure reducing valve inlet ball valve 20 and the first-level pressure reducing valve outlet ball valve 23 are in the open state at the same time, so that the main branch is in the passage state, and at the same time, the first-level pressure reducing valve standby inlet ball valve 21 and the first-level pressure reducing valve standby outlet ball valve 25 are in the closed state at the same time, so that the standby branch is in the open state.

[0111] When the main branch is in an open circuit state due to a problem with the valve on it, the first-stage pressure reducing valve backup inlet ball valve 21 and the first-stage pressure reducing valve backup outlet ball valve 25 can be opened at the same time to put the backup branch in a pass state to ensure the connectivity of the entire circuit. That is to say, when working, the main branch is in a pass state and the backup branch is in an open circuit state. Only when a problem occurs in the main branch, the backup branch is put in a pass state.

[0112] Among them, the first-stage pressure reducing valve 22 and the spare first-stage pressure reducing valve 24 are used to ensure that the gas has a stable pressure when in use. No matter how high the pressure of the upstream gas is, the first-stage pressure reducing valve 22 and the spare first-stage pressure reducing valve 25 can play a role in reducing and stabilizing the pressure.

[0113] Please refer to Figure 6 The first-level pressure measuring assembly 26 includes a wellhead control panel working gas pressure gauge 27 and a first one-way valve 28. The wellhead control panel working gas pressure gauge 27 is provided with a normally open wellhead control panel working gas pressure gauge isolation needle valve 29.

[0114] It should be noted that the wellhead control panel working gas pressure gauge 27 is used to detect the pressure of the gas after passing through the primary pressure reducing valve 22 or the standby primary pressure reducing valve 24. The isolation needle valve 29 of the wellhead control panel working gas pressure gauge is normally open to keep the primary pressure reducing circuit in a pass state. When the wellhead control panel working gas pressure gauge 27 needs to be repaired, the isolation needle valve 29 of the wellhead control panel working gas pressure gauge is closed to keep the primary pressure reducing circuit in an open circuit state for safe maintenance work. Among them, the function of the first one-way valve 28 is to prevent the gas from flowing back.

[0115] Please refer to Figure 1 and Figure 2 The secondary pressure reducing circuit is provided with a pilot pressure regulating valve inlet ball valve 30 and a pilot pressure regulating valve spare inlet ball valve 31 connected in parallel. The pilot pressure regulating valve inlet ball valve 30 is connected in series with the pilot pressure regulating valve 32 and the pilot pressure regulating valve outlet ball valve 33. The pilot pressure regulating valve spare inlet ball valve 31 is connected in series with the spare pilot pressure regulating valve 34 and the pilot pressure regulating valve spare outlet ball valve 35.

[0116] It can be understood that the branch where the pilot pressure regulating valve inlet ball valve 30, the pilot pressure regulating valve 32 and the pilot pressure regulating valve outlet ball valve 33 are located is the main branch, and the branch where the pilot pressure regulating valve spare inlet ball valve 31, the spare pilot pressure regulating valve 34 and the pilot pressure regulating valve spare outlet ball valve 35 are located is the spare branch. When working, generally the pilot pressure regulating valve inlet ball valve 30 and the pilot pressure regulating valve outlet ball valve 33 are in the open state at the same time, so that the main branch is in the passage state, and at the same time, the pilot pressure regulating valve spare inlet ball valve 31 and the pilot pressure regulating valve spare outlet ball valve 35 are in the closed state at the same time, so that the spare branch is in the open state.

[0117] When the main branch is in an open circuit state due to a problem with the valve on it, the pilot pressure regulating valve backup inlet ball valve 31 and the pilot pressure regulating valve backup outlet ball valve 35 can be opened at the same time to put the backup branch in a pass state to ensure the connectivity of the entire circuit. That is to say, when working, the main branch is in a pass state and the backup branch is in an open circuit state. Only when a problem occurs in the main branch, the backup branch is put in a pass state.

[0118] Among them, the pilot pressure regulating valve 32 and the spare pilot pressure regulating valve 34 are used to ensure that the gas has a stable pressure when in use. No matter how high the pressure of the upstream gas is, the pilot pressure regulating valve 32 and the spare pilot pressure regulating valve 34 can play a role in reducing and stabilizing the pressure.

[0119] Please refer to Figure 7 The secondary pressure measuring assembly 36 includes a pilot relief valve 37 and a pilot pressure gauge 38 , and the pilot pressure gauge 38 is provided with a normally open pilot pressure gauge isolation needle valve 39 .

[0120] It should be noted that the pilot relief valve 37 is used to adjust the overflow and maintain the basic stability of the pressure, which is equivalent to a safety valve. The pilot pressure gauge 38 is used to detect the pressure of the gas after pressure regulation by the pilot pressure regulating valve 32 and the spare pilot pressure regulating valve 34. The pilot pressure gauge isolation needle valve 39 is in a normally open state to keep the secondary pressure reducing circuit in a pass state. When the pilot pressure gauge 38 needs to be inspected and repaired, the pilot pressure gauge isolation needle valve 39 is closed to keep the secondary pressure reducing circuit in an open circuit state for safe inspection and maintenance work.

[0121] Please refer to Figure 8 and Fig. 9 One set of control panels also includes an inflation circuit and a shielding circuit connected to the secondary pressure reducing circuit. The inflation circuit is followed by a fusible plug circuit. The shielding circuit is followed by an emergency manual alarm station circuit. The fusible plug circuit is connected in parallel with the emergency manual alarm station circuit. A fusible plug pressure measuring assembly 40 for detecting the pressure of the fusible plug circuit is provided on the fusible plug circuit. An emergency manual alarm station pressure measuring assembly 41 for detecting the pressure of the emergency manual alarm station circuit is provided on the emergency manual alarm station circuit.

[0122] It can be understood that the fusible plug pressure measuring assembly 40 includes a fusible plug circuit one-way valve 42, a fusible plug circuit pressure gauge 43 and a fusible plug circuit pressure transmitter 44. The fusible plug circuit is connected to the emergency manual alarm station 45. The fusible plug circuit pressure gauge 43 is provided with a fusible plug circuit pressure gauge isolation needle valve 46, and the fusible plug circuit pressure transmitter 44 is provided with a fusible plug circuit pressure transmitter isolation needle valve 47. The fusible plug circuit pressure gauge isolation needle valve 46 and the fusible plug circuit pressure transmitter isolation needle valve 47 are normally open to put the fusible plug circuit in a passage state. When the fusible plug circuit pressure gauge 43 and the fusible plug circuit pressure transmitter 44 need to be inspected and repaired, the fusible plug circuit pressure gauge isolation needle valve 46 and the fusible plug circuit pressure transmitter isolation needle valve 47 are closed to put the fusible plug circuit in an open circuit state for safe inspection and maintenance work.

[0123] The emergency manual alarm station pressure measuring assembly 41 includes an emergency manual alarm station circuit non-return valve 48, an emergency manual alarm station circuit pressure gauge 49 and an emergency manual alarm station circuit pressure transmitter 50. The emergency manual alarm station circuit is connected to the fusible plug 51. The emergency manual alarm station circuit pressure gauge 49 is provided with an emergency manual alarm station circuit pressure gauge isolation needle valve 52. The emergency manual alarm station circuit pressure transmitter 50 is provided with an emergency manual alarm station circuit pressure transmitter isolation needle valve 53. The emergency manual alarm station circuit pressure gauge isolation needle valve 52 and the emergency manual alarm station circuit pressure transmitter isolation needle valve 53 are in a normally open state to put the emergency manual alarm station circuit in a passage state. When the emergency manual alarm station circuit pressure gauge 49 and the emergency manual alarm station circuit pressure transmitter 50 need to be overhauled, the emergency manual alarm station circuit pressure gauge isolation needle valve 52 and the emergency manual alarm station circuit pressure transmitter isolation needle valve 53 are closed to put the emergency manual alarm station circuit in a circuit-breaking state for safe overhaul work.

[0124] In the above embodiment, a button valve 54 and a second one-way valve 55 are also provided on the inflation circuit, a relay valve 56 and a throttle hole joint 57 are also connected in parallel on the inflation circuit, and a shielding ball valve 58, a shielding pressure transmitter 59, a shielding pressure transmitter isolation needle valve 60 and a shielding shuttle valve 61 are also provided on the shielding circuit.

[0125] It should be noted that the button valve 54 is in a normally closed state. When the fusible plug circuit needs to be turned on, the button valve 54 needs to be pressed manually to turn on the fusible plug circuit. The second one-way valve 55 of the fusible plug circuit prevents gas backflow. The relay valve 56 can only be opened under pressure, and the throttle joint 57 has a throttling function. That is to say, before the button valve 54 is operated to inflate, the fusible plug circuit behind it is in a disconnected state. Only when the button valve 54 is pressed to turn on, this part is in a passage state. At this time, the gas will flow from the branch where the relay valve 56 is located, and a certain pressure will be generated on the relay valve 56 to open the relay valve 56, so that the branch where the relay valve 56 is located is in a passage state. The pilot pressure will continue to slowly replenish the pressure of the fusible plug circuit through the throttle joint 57 to achieve the function of compensating pressure for small leaks in the fusible plug circuit.

[0126] The shielded pressure transmitter isolation needle valve 60 is in a normally open state. When the shielded pressure transmitter 59 needs to be repaired, the shielded pressure transmitter isolation needle valve 60 is closed to perform safe repair work.

[0127] The function of remote transmission of the status of the shielded fusible plug circuit and the emergency manual alarm station circuit is realized by combining the shielded ball valve 58 and the shielded shuttle valve 61. This method can remotely determine whether the fusible plug circuit and the emergency manual alarm station circuit are in the shielded state or the operating state through the output signal of the shielded pressure transmitter 59.

[0128] The existing control panel does not have a shielding shuttle valve 61, and the only way to determine whether the fusible plug circuit and the emergency manual alarm station circuit are in a shielding state or an operating state is to observe on site. However, the present application adds a shielding shuttle valve 61, which can realize remote judgment of whether the fusible plug circuit and the emergency manual alarm station circuit are in a shielding state or an operating state.

[0129] In summary, the offshore wellhead emergency shut-off device provided by the utility model connects the gas source pressure circuit to establish the pilot control circuit pressure, the gas-driven liquid pump works to establish the hydraulic system pressure, the first shut-off solenoid valve 3 and the second shut-off solenoid valve 6 of the two control panels are energized, the first shut-off hand-pull valve 2 and the second shut-off hand-pull valve 5 of the first control panel are pulled up and the locking pin is inserted, the first shut-off hand-pull valve 2 of the second control panel is pulled up, and the downhole safety valve control circuits of the two devices are opened at this time, and the second shut-off hand-pull valve 5 of the second control panel is pulled up, and the uphole safety valve control circuits of the two devices are opened at this time. The second shut-off solenoid valve 6 of the first control panel or the second control panel is remotely shut off, or the second shut-off hand-pull valve 5 of the first control panel or the second control panel is manually pushed down to close all uphole safety valves; the first shut-off solenoid valve 3 of the first control panel or the second control panel is remotely shut off, or the first shut-off hand-pull valve 2 of the first control panel or the second control panel is manually pushed down to close all downhole safety valves.

[0130] A first shutoff relay valve 1 and a second shutoff relay valve 4 are respectively added before the first shutoff solenoid valve 3 and the second shutoff solenoid valve 6 of the two devices, and the pilot control port is connected to the corresponding position of the other device through a pipeline. When the second shutoff is performed by operating the second shutoff solenoid valve 6 or the second shutoff hand-pull valve 5 of the first control panel, the second shutoff circuit of the first control panel loses pressure, causing the second shutoff relay valve 4 of the interlocking panel to lose the pilot pressure, thereby causing the second shutoff hand-pull valve 5 to lose the pilot pressure, and the second shutoff circuit pressure of the second control panel to lose. At this time, both devices have completed the shutoff of the 3rd level emergency shutoff circuit; when the first shutoff circuit is shutoff by operating the first shutoff solenoid valve 3 or the first shutoff hand-pull valve 2 of the first control panel, the first shutoff circuit and the second shutoff circuit of the first control panel lose pressure, causing the first shutoff relay valve 1 and the second shutoff relay valve 4 of the interlocking panel to lose the pilot pressure, thereby causing the first shutoff hand-pull valve 2 and the second shutoff hand-pull valve 5 to lose the pilot pressure, and the first shutoff circuit and the second shutoff circuit pressure of the second control panel to lose. At this time, both devices have completed the shutoff of the 1 / 2 level emergency shutoff circuit. Similarly, when the equipment of the second control panel is operated in the same way, the same shutoff effect will also be produced. Moreover, the 1 / 2 level emergency shutdown circuit is the highest level shutdown, and will also cause the 3 level emergency shutdown circuit to be shut down.

[0131] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0132] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0133] The above is a detailed introduction to the offshore wellhead emergency shut-off device provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. An offshore wellhead emergency shutdown device, characterized in that: The invention comprises two sets of control panels, each of which comprises an air source pressure circuit connected to an air source, the air source pressure circuit being connected to a pressure reducing circuit for reducing and controlling gas pressure, the pressure reducing circuit being followed by a first shut-off circuit, the first shut-off circuit being a 1 / 2-stage emergency shut-off circuit, the first shut-off circuit being provided with a first shut-off relay valve (1) and a first shut-off hand-pull valve (2) and a first shut-off solenoid valve (3) for controlling the on-off thereof, the 1 / 2-stage emergency shut-off circuits of the two sets of control panels being connected in series with a pipeline via the first shut-off relay valve (1), the first shut-off circuit being followed by a second shut-off circuit, the second shut-off circuit being a 3-stage emergency shut-off circuit, the second shut-off circuit being provided with a second shut-off relay valve (4) and a second shut-off hand-pull valve (5) and a second shut-off solenoid valve (6) for controlling the on-off thereof, the 3-stage emergency shut-off circuits of the two sets of control panels being connected in series with the pipeline via the second shut-off relay valve (4).

2. The offshore wellhead emergency shutdown device according to claim 1, characterized in that: A first branch connected to the pressure reducing circuit is also provided. The first branch is a 1 / 2 level emergency shut-off branch. A first pressure indicator (7) and a first pressure transmitter (8) are provided on the first branch. A normally open first pressure indicator isolation needle valve (9) is provided on the first pressure indicator (7). A normally open first pressure transmitter isolation needle valve (10) is provided on the first pressure transmitter (8).

3. The offshore wellhead emergency shutdown device according to claim 2, characterized in that: A second branch connected to the pressure reducing circuit is also provided, the second branch being a level 3 emergency shut-off branch, the second branch being provided with a second pressure indicator (11) and a second pressure transmitter (12), the second pressure indicator (11) being provided with a normally open second pressure indicator isolation needle valve (13), and the second pressure transmitter (12) being provided with a normally open second pressure transmitter isolation needle valve (14).

4. The offshore wellhead emergency shutdown device according to claim 3 is characterized in that: The gas source pressure circuit is provided with a gas source pressure measuring assembly (15) for monitoring the gas source pressure. The gas source pressure measuring assembly (15) comprises a gas source pressure gauge (16) and a gas source pressure transmitter (17). The gas source pressure gauge (16) is provided with a normally open gas source pressure gauge isolation needle valve (18), and the gas source pressure transmitter (17) is provided with a normally open gas source pressure transmitter isolation needle valve (19).

5. The offshore wellhead emergency shutdown device according to claim 4, characterized in that: The pressure reducing circuit is provided with a first-stage pressure reducing valve inlet ball valve (20) and a first-stage pressure reducing valve spare inlet ball valve (21) connected in parallel; the first-stage pressure reducing valve inlet ball valve (20) is connected in series with the first-stage pressure reducing valve (22) and the first-stage pressure reducing valve outlet ball valve (23); the first-stage pressure reducing valve spare inlet ball valve (21) is connected in series with a spare first-stage pressure reducing valve (24) and a spare first-stage pressure reducing valve outlet ball valve (25).

6. The offshore wellhead emergency shutdown device according to claim 5, characterized in that: The pressure reducing circuit is also provided with a first-level pressure measuring assembly (26), the first-level pressure measuring assembly (26) comprising a wellhead control panel working gas pressure gauge (27) and a first non-return valve (28), and the wellhead control panel working gas pressure gauge (27) is provided with a normally open wellhead control panel working gas pressure gauge isolation needle valve (29).

7. The offshore wellhead emergency shutdown device according to claim 6, characterized in that: The pressure reducing circuit is also provided with a pilot pressure regulating valve inlet ball valve (30) and a pilot pressure regulating valve spare inlet ball valve (31) connected in parallel. The pilot pressure regulating valve inlet ball valve (30) is connected in series with the pilot pressure regulating valve (32) and the pilot pressure regulating valve outlet ball valve (33). The pilot pressure regulating valve spare inlet ball valve (31) is connected in series with the spare pilot pressure regulating valve (34) and the pilot pressure regulating valve spare outlet ball valve (35).

8. The offshore wellhead emergency shutdown device according to claim 7, characterized in that: The pressure reducing circuit is also provided with a secondary pressure measuring assembly (36), the secondary pressure measuring assembly (36) comprising a pilot relief valve (37) and a pilot pressure gauge (38), the pilot pressure gauge (38) being provided with a normally open pilot pressure gauge isolation needle valve (39).

9. The offshore wellhead emergency shutdown device according to claim 1, characterized in that: One set of the control panels further comprises an inflation circuit and a shielding circuit connected to the decompression circuit, the inflation circuit is followed by a fusible plug circuit, the shielding circuit is followed by an emergency manual alarm station circuit, the fusible plug circuit is connected in parallel with the emergency manual alarm station circuit, the fusible plug circuit is provided with a fusible plug pressure measuring assembly (40) for detecting the pressure of the fusible plug circuit, and the emergency manual alarm station circuit is provided with an emergency manual alarm station pressure measuring assembly (41) for detecting the pressure of the emergency manual alarm station circuit.

10. The offshore wellhead emergency shutdown device according to claim 9, characterized in that: The inflation circuit is also provided with a button valve (54) and a second one-way valve (55), the inflation circuit is also connected in parallel with a relay valve (56) and a throttle hole joint (57), and the shielding circuit is also provided with a shielding ball valve (58), a shielding pressure transmitter (59), a shielding pressure transmitter isolation needle valve (60) and a shielding shuttle valve (61).

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