Non-return type deep well liquid control and mixing system and operation method

Abstract

The invention discloses a non-return type deep well liquid mixing control system which is characterized in that a fresh water joint is connected with the input end of a marine water tank, the output end of the marine water tank is connected with the input end of a first mixing filter, and the output end of the first mixing filter is connected with a mixed liquid tank; a bypass branch is further connected between the fresh water connector and the input end of the first mixing filter; the ethylene glycol cabinet is connected with the input end of the second mixing filter; the water-based soluble concentrated solution cabinet is connected with the input end of the second mixing filter; a standby branch is connected between the input end of the ethylene glycol conveying pump and the input end of the water-based soluble concentrated solution conveying pump, and an isolating valve is connected to the standby branch. Fresh water, ethylene glycol and a water-based soluble concentrated solution can be conveyed through different pipelines to be mixed, the phenomenon that the liquid mixing function of the whole system is affected due to the fact that a certain pump breaks down is avoided, and the redundancy and reliability of the system are high; the invention further provides an operation method of the non-return type deep well liquid control and mixing system.

Description

Technical Field

[0001] The invention belongs to the field of deepwater drilling equipment, and in particular relates to a non-return deepwater well control mixing system and an operation method. Background Art

[0002] The deepwater well control hydraulic control system is a key technology used in the development of deepwater oil and gas fields. It involves equipment that effectively controls the wellhead under high pressure and complex marine environments. The deepwater well control hydraulic control system plays a vital role in the entire well control operation and directly affects whether the well control operation can operate normally and reliably. As the front end of the deepwater well control hydraulic control system, the deepwater well control mixing system needs to deliver control fluid with a suitable mixing ratio to the deepwater well control hydraulic control system. The deepwater well control mixing system is mainly used for the front-end liquid distribution operation of the deepwater well control hydraulic control system. According to the operation mode, it can be divided into non-return and return designs. The mixed liquid of the non-return deepwater well control mixing system is discharged to the sea at the blowout preventer and will not return to the mixing system. The existing non-return deepwater well control mixing system has low system redundancy and reliability. Generally, different pumps are used to extract and transport the corresponding liquids from their respective tanks. If a pump fails, it is easy to cause the mixing function of the entire system to be affected or even stagnant; in addition, the existing non-return deepwater well control mixing system is generally directly filled with ship fresh water without additional disinfection and sterilization treatment, which is easy to cause the mixed control liquid to deteriorate, and then block the key components of the blowout preventer, affecting the entire deepwater well control operation. Therefore, in order to avoid the shortcomings of the prior art, it is necessary to improve the prior art. Summary of the invention

[0003] The purpose of the present invention is to provide a non-return deepwater well control mixing system, which can transport fresh water, ethylene glycol and water-based soluble concentrate through different pipelines for mixing, so as to avoid the mixing function of the entire system being affected due to the failure of a pump, and the system has high redundancy and reliability; the present invention also provides an operating method of the non-return deepwater well control mixing system.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0005] A non-return deepwater well control mixed liquid system, comprising a fresh water joint, a marine water tank, a first mixed filter, a mixed liquid tank, an ethylene glycol tank, a water-based soluble concentrate tank, a second mixed filter and a hydraulic pump station interface; the fresh water joint is connected to the input end of the marine water tank, the output end of the marine water tank is connected to the input end of the first mixed filter, a fresh water delivery pump is connected in series between the output end of the marine water tank and the input end of the first mixed filter, the output end of the first mixed filter is connected to the mixed liquid tank, a bypass branch is also connected between the fresh water joint and the input end of the first mixed filter, the A first valve is connected to the bypass branch; the ethylene glycol cabinet is connected to the input end of the second mixed filter, and an ethylene glycol delivery pump is connected in series between the ethylene glycol cabinet and the input end of the second mixed filter; the water-based soluble concentrate cabinet is connected to the input end of the second mixed filter, and a water-based soluble concentrate delivery pump is connected in series between the water-based soluble concentrate cabinet and the second mixed filter; a spare branch is connected between the input end of the ethylene glycol delivery pump and the input end of the water-based soluble concentrate delivery pump, and an isolation valve is connected to the spare branch; the mixed liquid cabinet is connected to the interface of the hydraulic pump station.

[0006] As a preferred solution of the above-mentioned non-return deepwater well controlled mixed liquid system, the output end of the fresh water joint is connected to a second valve and a disinfection and sterilization device, the second valve and the disinfection and sterilization device are connected in parallel, and the input and output ends of the disinfection and sterilization device are respectively connected to switch valves.

[0007] As a preferred solution of the above-mentioned non-return deepwater well control mixed liquid system, the disinfection and sterilization device is connected to a backwashing interface.

[0008] As a preferred solution of the non-return deepwater well control mixing system, the output end of the marine water tank, the output end of the ethylene glycol tank and the output end of the water-based soluble concentrate tank are all provided with a switch valve and a pre-pump filter.

[0009] As a preferred solution of the above-mentioned non-return deepwater well control mixed liquid system, the mixed liquid cabinet is connected to a circulation pump, the output end of the mixed liquid cabinet is connected to the input end of the circulation pump, and the output end of the circulation pump is connected to the input end of the mixed liquid cabinet.

[0010] As a preferred solution of the above-mentioned non-return deepwater well control mixed liquid system, a fresh water flow meter and a switch valve are connected between the first mixing filter and the mixed liquid cabinet, and the fresh water flow meter is connected in parallel with a bypass valve.

[0011] As a preferred solution of the above-mentioned non-return deepwater well control mixed liquid system, the first mixed filter includes two filters, and the two filters are arranged in parallel, and the second mixed filter includes two filters, and the two filters are arranged in parallel.

[0012] As a preferred solution of the non-return deepwater well control mixing system, an automatic float valve is provided at the input end of the marine water tank, and a bypass switch valve connected in parallel with the automatic float valve is also connected to the input end of the marine water tank.

[0013] As a preferred solution of the above-mentioned non-return deepwater well control mixed liquid system, the marine water tank, the ethylene glycol tank, the water-based soluble concentrate tank and the mixed liquid tank are respectively provided with liquid level switches.

[0014] The present invention also provides an operation method of a non-return deepwater well control liquid mixing system, wherein liquid mixing is performed by the non-return deepwater well control liquid mixing system, comprising the following steps:

[0015] When fresh water is added through the marine water tank, the first valve is closed, the fresh water connector adds fresh water to the marine water tank, and the fresh water in the marine water tank is filtered through the first mixing filter and then transported to the mixed liquid tank;

[0016] When fresh water is added through the bypass branch, the first valve is opened, the fresh water connector delivers fresh water through the first valve, and the fresh water is delivered to the mixed liquid tank after being filtered by the first mixing filter;

[0017] Turning on the ethylene glycol delivery pump to deliver the ethylene glycol in the ethylene glycol tank to the second mixing filter for filtration and then to the mixed liquid tank;

[0018] Turning on the water-based soluble concentrated liquid delivery pump to deliver the water-based soluble concentrated liquid in the water-based soluble concentrated liquid tank to the second mixing filter for filtration and then to the mixed liquid tank;

[0019] When the ethylene glycol delivery pump fails, the ethylene glycol delivery pump is turned off and the isolation valve is opened, and the ethylene glycol in the ethylene glycol tank is delivered to the second mixed filter through the water-based soluble concentrated liquid delivery pump for filtration and then delivered to the mixed liquid tank;

[0020] When the water-based soluble concentrate delivery pump fails, the water-based soluble concentrate delivery pump is turned off and the isolation valve is opened to deliver the water-based soluble concentrate in the water-based soluble concentrate tank through the ethylene glycol pump to the second mixing filter for filtration and then to the mixed liquid tank.

[0021] Compared with the prior art, the non-return deepwater well controlled liquid mixing system provided by the present invention has the following beneficial effects:

[0022] The present invention is connected to a fresh water source through a fresh water connector, and the fresh water source is tap water on land or fresh water purification equipment at sea. The fresh water connector is connected to a marine water tank to add fresh water to the marine water tank. The marine water tank can store fresh water. When liquid mixing is required, the fresh water in the marine water tank is transported to the first mixing filter through a fresh water delivery pump for filtration and then transported to the mixed liquid tank. When the fresh water delivery pump fails, the fresh water delivery pump can be closed and the first valve can be opened. The fresh water connector is directly transported to the first mixing filter through a bypass branch for filtration and then transported to the mixed liquid tank. In this way, when the fresh water delivery pump fails, it can be ensured that the mixing process can continue, thereby improving the redundancy and reliability of the system; the ethylene glycol tank transports ethylene glycol to the second mixing filter for filtration and then transports it to the mixed liquid tank through the ethylene glycol delivery pump, and the water-based soluble concentrate tank transports the water-based soluble concentrate to the second The mixed liquid is filtered by the mixing filter and then transported to the mixed liquid cabinet. When the ethylene glycol delivery pump fails, the ethylene glycol delivery pump is closed and the isolation valve is opened. The ethylene glycol in the ethylene glycol cabinet is transported to the second mixing filter through the spare branch and the water-based soluble concentrate delivery pump for filtration and then transported to the mixed liquid cabinet. When the water-based soluble concentrate delivery pump fails, the water-based soluble concentrate delivery pump is closed and the isolation valve is opened. The water-based soluble concentrate in the water-based soluble concentrate cabinet is transported to the second mixing filter through the spare branch and the ethylene glycol pump for filtration and then transported to the mixed liquid cabinet. The mixed liquid cabinet is connected to the hydraulic pump station interface to transport the mixed liquid, and then transported to various hydraulic equipment through the hydraulic pump station. The setting of the spare branch ensures that when one of the ethylene glycol pump delivery pump or the water-based soluble concentrate delivery pump fails, the entire mixing system can still mix the liquid normally, thereby improving the redundancy and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings of the embodiment are briefly introduced below.

[0024] Figure 1 It is a schematic diagram of the non-return deepwater well controlled mixed liquid system of the present invention.

[0025] Markings in the figure:

[0026] 1. Fresh water connector; 2. Automatic float valve; 201. Bypass switch valve; 3. Liquid level switch; 4. Marine water tank; 5. Pre-pump filter; 501. Switch valve; 6. Fresh water delivery pump; 7. Breathing valve; 8. First valve; 9. First mixing filter; 901. Second mixing filter; 10. Fresh water flow meter; 11. Ethylene glycol tank; 12. Ethylene glycol delivery pump; 13. Water-based soluble concentrate tank; 14. Water-based soluble concentrate delivery pump; 15. Isolation valve; 16. Mixing liquid tank; 17. Circulation pump; 18. Hydraulic pump station interface; 19. Reflux pipeline interface; 20. Disinfection and sterilization device; 21. Backwash interface; 22. Bypass valve. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Please also read Figure 1 Now, the non-return deepwater well controlled mixing system provided by an embodiment of the present invention is described.

[0032] like Figure 1As shown, the non-return deepwater well control mixed liquid system of the present invention comprises a fresh water joint 1, a marine water tank 4, a first mixed filter 9, a mixed liquid tank 16, an ethylene glycol tank 11, a water-based soluble concentrate tank 13, a second mixed filter 901 and a hydraulic pump station interface 18; the fresh water joint 1 is connected to the input end of the marine water tank 4, the output end of the marine water tank 4 is connected to the input end of the first mixed filter 9, a fresh water delivery pump 6 is connected in series between the output end of the marine water tank 4 and the input end of the first mixed filter 9, the output end of the first mixed filter 9 is connected to the mixed liquid tank 16, a bypass branch is also connected between the fresh water joint 1 and the input end of the first mixed filter 9, and the bypass branch is connected between the fresh water joint 1 and the input end of the first mixed filter 9. A first valve 8 is connected to the branch; the ethylene glycol tank 11 is connected to the input end of the second mixed filter 901, and an ethylene glycol delivery pump 12 is connected in series between the ethylene glycol tank 11 and the input end of the second mixed filter 901; the water-based soluble concentrate tank 13 is connected to the input end of the second mixed filter 901, and a water-based soluble concentrate delivery pump 14 is connected in series between the water-based soluble concentrate tank 13 and the second mixed filter 901; a spare branch is connected between the input end of the ethylene glycol delivery pump 12 and the input end of the water-based soluble concentrate delivery pump 14, and an isolation valve 15 is connected to the spare branch; the mixed liquid tank 16 is connected to the hydraulic pump station interface 18.

[0033] Exemplarily, the first valve 8 is a remote control valve. When the fresh water delivery pump 6 fails, the switch of the first valve 8 can be remotely controlled to deliver fresh water.

[0034] Specifically, in actual work, since ethylene glycol and the water-based soluble concentrate do not chemically react, a backup branch line and an isolation valve 15 are set. When one of the ethylene glycol pump delivery pump or the water-based soluble concentrate delivery pump 14 fails, the ethylene glycol can be delivered to the second mixed filter 901 through the water-based soluble concentrate delivery pump 14 or the water-based soluble concentrate can be delivered to the second mixed filter 901 through the ethylene glycol delivery pump 12. The two serve as backup for each other, thereby ensuring the stable operation of the mixed liquid system. In actual work, the ethylene glycol delivery pump 1 2 and the water-based soluble concentrate delivery pump 14 can be operated at different times. For example, when working in the South China Sea, the seabed temperature is high, and there is no need to add ethylene glycol to the mixed liquid. In this way, when the water-based soluble concentrate delivery pump 14 fails, the water-based soluble concentrate delivery pump 14 is turned off and the isolation valve 15 is opened. The water-based soluble concentrate in the water-based soluble concentrate tank 13 is delivered to the second mixing filter 901 through the spare branch and filtered by the ethylene glycol pump and then delivered to the mixed liquid tank 16. This can avoid the failure of a pump causing the mixing function of the entire system to be affected, thereby improving the redundancy and reliability of the mixing system.

[0035] Exemplarily, the output end of the fresh water connector 1 is connected to a second valve and a disinfection device 20, the second valve and the disinfection device 20 are connected in parallel, and the input end and the output end of the disinfection device 20 are respectively connected to a switch valve 501. When it is necessary to sterilize the fresh water entering from the fresh water connector 1, the second valve is closed and the switch valves 501 at the input end and the output end of the disinfection device 20 are opened, so that the fresh water is disinfected by the disinfection device 20 before flowing to the marine water tank 4 or the bypass branch. Disinfection and sterilization of the fresh water can avoid deterioration of the mixed control fluid, avoid clogging of key components of the blowout preventer, protect various hydraulic equipment, and ensure that the entire deepwater well control operation is carried out safely and stably.

[0036] Exemplarily, the disinfection and sterilization device 20 is connected to a backwash interface 21, and the backwash interface 21 is set to regularly backwash the disinfection and sterilization device 20. After being used for a period of time, the filter layer of the disinfection and sterilization device 20 is prone to clogging, which affects the disinfection and sterilization effect. Regular backwashing ensures that the disinfection and sterilization device 20 can maintain a good disinfection and sterilization effect.

[0037] Exemplarily, the output end of the marine water tank 4, the output end of the ethylene glycol tank 11 and the output end of the water-based soluble concentrate tank 13 are all provided with a switch valve 501 and a pre-pump filter 5. The switch valve 501 is provided to prevent the liquid in the pipeline from flowing back to the tank. When the isolation valve 15 is opened to start the backup branch to transport the liquid, ethylene glycol is prevented from entering the water-based soluble concentrate tank 13 after passing through the backup branch, and the water-based soluble concentrate is prevented from entering the ethylene glycol tank 11 after passing through the backup branch. The pre-pump filter 5 filters the liquid output from the tank to prevent impurities from damaging each delivery pump.

[0038] Exemplarily, the mixed liquid cabinet 16 is connected to a circulation pump 17, the output end of the mixed liquid cabinet 16 is connected to the input end of the circulation pump 17, the output end of the circulation pump 17 is connected to the input end of the mixed liquid cabinet 16, the circulation pump 17 and the mixed liquid cabinet 16 form a circulation pipeline, and the circulation pump 17 starts to circulate and stir the mixed control liquid in the mixed liquid cabinet 16 at a regular time to keep the mixed control liquid fully mixed. A filter is provided in front of the circulation pump 17 for filtering the mixed control liquid.

[0039] Exemplarily, a fresh water flow meter 10 and a switch valve 501 are connected between the first mixing filter 9 and the mixed liquid tank 16. The fresh water flow meter 10 is connected in parallel with a bypass valve 22. The fresh water flow meter 10 can monitor the flow of fresh water delivered to the mixed liquid tank 16 through the first mixing filter 9, so as to determine whether the fresh water filling is normal. When the fresh water flow meter 10 fails, the bypass valve 22 can be opened, and the fresh water filtered by the first mixing filter 9 flows to the mixed liquid tank 16 through the bypass valve 22. The filling amount can be observed through the liquid level meter on the mixed liquid tank 16 without affecting the continued operation of the system.

[0040] Exemplarily, the first hybrid filter 9 includes two filters, and the two filters are arranged in parallel. The second hybrid filter 901 includes two filters, and the two filters are arranged in parallel. The two filters are connected in parallel. During normal use, only one filter will be opened. When a filter fails, other parallel filters can be started for filtering to ensure normal filtering and improve the reliability of the system.

[0041] Exemplarily, the input end of the marine water tank 4 is provided with an automatic float valve 2, and the input end of the marine water tank 4 is also connected to a bypass switch valve 201 connected in parallel with the automatic float valve 2. The automatic float valve 2 is provided on the marine water tank 4 for automatic water replenishment of the marine water tank 4. When the automatic float valve 2 fails, the bypass switch valve 201 can be selected for manual filling.

[0042] Exemplarily, the marine water tank 4, the ethylene glycol tank 11, the water-based soluble concentrate tank 13 and the mixed liquid tank 16 are respectively provided with a liquid level switch 3, and the liquid level switch 3 is arranged at different heights of the marine water tank 4, the ethylene glycol tank 11, the water-based soluble concentrate tank 13 and the mixed liquid tank 16, and is used for the liquid level alarm and start-stop pump group of the tank according to functional requirements; specifically, the marine water tank 4, the ethylene glycol tank 11, and the water-based soluble concentrate tank 13 are all provided with a liquid level switch 3 with three liquid level heights, which are the first liquid level, the second liquid level and the third liquid level from top to bottom, respectively, and the liquid level switch 3 of the first liquid level performs a high-level alarm The liquid level switch 3 of the second liquid level performs a low level alarm, and the liquid level switch 3 of the third liquid level is used to stop the delivery pump of the pipeline; and the mixed liquid cabinet 16 is provided with a liquid level switch 3 of four liquid level heights, which are the first liquid level, the second liquid level, the third liquid level and the fourth liquid level from top to bottom. The highest first liquid level is used to stop the fresh water delivery pump 6, the ethylene glycol delivery pump 12 and the water-based soluble concentrate delivery pump 14, and the fresh water delivery pump 6, the ethylene glycol delivery pump 12 and the water-based soluble concentrate delivery pump 14 are started at the second liquid level, a low level alarm is performed at the third liquid level, and the circulation pump 17 and the hydraulic pump station interface 18 are stopped at the fourth liquid level.

[0043] Exemplarily, the fresh water delivery pump 6, the ethylene glycol tank 11, the water-based soluble concentrate tank 13 and the mixed liquid tank 16 are respectively provided with a ventilation valve 7, which is connected to the external environment. The ventilation valve 7 is used for ventilation of the fresh water delivery pump 6, the ethylene glycol tank 11, the water-based soluble concentrate tank 13 and the mixed liquid tank 16.

[0044] Exemplarily, the mixed liquid tank 16 is provided with a reflux pipeline interface 19, which is connected to the hydraulic system of the hydraulic equipment. The control fluid of the recyclable hydraulic equipment is refluxed to the mixed liquid tank 16 through the reflux pipeline interface 19, so as to facilitate the reuse of the mixed liquid. The refluxed mixed liquid is transported to the circulation pipeline through the circulation pump 17 for filtration and then flows back to the mixed liquid tank 16. After filtration, it is transported to each hydraulic equipment through the hydraulic pump station interface 18 for continued use.

[0045] The present invention also provides an operation method of a non-return deepwater well control liquid mixing system, wherein liquid mixing is performed by the non-return deepwater well control liquid mixing system, comprising the following steps:

[0046] When fresh water is added through the marine water tank 4, the first valve 8 is closed, and the fresh water connector 1 adds fresh water to the marine water tank 4. The fresh water in the marine water tank 4 is filtered by the first mixing filter 9 and then transported to the mixed liquid tank 16;

[0047] When fresh water is added through the bypass branch, the first valve 8 is opened, the fresh water connector 1 delivers fresh water through the first valve 8, and the fresh water is filtered by the first mixing filter 9 and then delivered to the mixed liquid tank 16;

[0048] Turn on the ethylene glycol delivery pump 12 to deliver the ethylene glycol in the ethylene glycol tank 11 to the second mixing filter 901 for filtration and then deliver to the mixed liquid tank 16;

[0049] Turn on the water-based soluble concentrated liquid delivery pump 14 to deliver the water-based soluble concentrated liquid in the water-based soluble concentrated liquid tank 13 to the second mixing filter 901 for filtration and then to the mixed liquid tank 16;

[0050] When the ethylene glycol delivery pump 12 fails, the ethylene glycol delivery pump 12 is turned off and the isolation valve 15 is opened, and the ethylene glycol in the ethylene glycol tank 11 is delivered to the second mixed filter 901 through the water-based soluble concentrate delivery pump 14 for filtration and then delivered to the mixed liquid tank 16;

[0051] When the water-based soluble concentrate delivery pump 14 fails, the water-based soluble concentrate delivery pump 14 is turned off and the isolation valve 15 is opened, and the water-based soluble concentrate in the water-based soluble concentrate tank 13 is delivered to the second mixing filter 901 through the ethylene glycol pump for filtration and then delivered to the mixed liquid tank 16.

[0052] Specifically, the fresh water from the fresh water source or the water produced by the seawater desalination device passes through the disinfection and sterilization device 20 and is automatically added to the ship water tank 4 from the automatic float valve 2. When a mixed liquid operation is required, the fresh water delivery pump 6 extracts a fixed amount of water from the ship water tank 4, the ethylene glycol delivery pump 12 extracts a fixed amount of ethylene glycol from the ethylene glycol tank 11, and the water-based soluble concentrate pump extracts a fixed amount of water-based soluble concentrate from the water-based soluble concentrate tank 13, and delivers them together to the mixed liquid tank 16, and further delivers them to the hydraulic pump station interface 18. The circulation pump 17 regularly circulates and stirs the mixed control liquid in the mixed liquid tank 16. In addition, when the fresh water delivery pump 6 fails, the fresh water from the fresh water source or the water produced by the seawater desalination device can directly enter the mixed liquid tank 16 through the first valve 8, the first mixing filter 9, and the fresh water flowmeter 10 as an alternative. Furthermore, the ethylene glycol delivery pump 12 and the water-based soluble concentrate pump serve as backup for each other, the fresh water flow meter 10 is connected in parallel with a bypass valve 22 to enable its backup bypass function, and the first mixing filter 9 and the second mixing filter 901 are designed as one for use and one for backup, which further improves the reliability and flexible operability of the system and enables underwater well control operations to be carried out safely and reliably.

[0053] The liquid mixing system is set in the automatic operation mode. When the liquid level switch 3 of the second liquid level of the mixed liquid tank 16 is triggered, the fresh water delivery pump 6 extracts an appropriate amount of water from the marine water tank 4 and delivers it to the mixed liquid tank 16, the ethylene glycol delivery pump 12 extracts an appropriate amount of ethylene glycol from the ethylene glycol tank 11 and delivers it to the mixed liquid tank 16, and the water-based soluble concentrate pump extracts an appropriate amount of water-based soluble concentrate from the water-based soluble concentrate tank 13 to the mixed liquid tank 16. When the liquid level switch 3 of the first liquid level of the mixed liquid tank 16 is triggered, the above pump groups all stop running, and the system completes or stops the current liquid mixing operation. When the liquid level switch 3 of the third liquid level of the mixed liquid tank 16 is triggered, an audible and visual alarm will appear on the remote interface to inform the operator that action is required. When the liquid level switch 3 of the fourth liquid level of the mixed liquid tank 16 is triggered, the system will automatically stop the circulation pump 17 and the hydraulic pump station pump group. When the liquid level switch 3 of the third liquid level of any marine water tank 4, ethylene glycol tank 11 or water-based soluble concentrate tank 13 is triggered, the fresh water delivery pump 6, ethylene glycol delivery pump 12 and water-based soluble concentrate delivery pump 14 will stop the pump or keep the pump stopped at the same time, and human intervention is required to troubleshoot the problem. In addition, the fresh water delivery pump 6, ethylene glycol delivery pump 12 and water-based soluble concentrate delivery pump 14 can manually adjust the flow rate required for the current operation on the remote panel or on the spot, or manually isolate and stop the operation of the ethylene glycol delivery pump 12 on the remote panel or on the spot according to the current operation situation, which is simple to operate and has strong system adaptability. When the fresh water delivery pump 6 fails, a bypass design can be selected, and the water produced by the fresh water source or the seawater desalination device is remotely controlled by a remote control valve to be delivered to the mixed liquid tank 16. In addition, the ethylene glycol delivery pump 12 and the water-based soluble concentrate pump can be used as standby for each other as appropriate. If the system is in manual control mode, the operator can start and stop the corresponding pump group, adjust the required flow rate and perform related inspection and maintenance work according to the actual operating conditions.

[0054] Compared with the prior art, the non-return deepwater well controlled liquid mixing system provided by the present invention has the following beneficial effects:

[0055] The present invention is connected to a fresh water source through a fresh water connector 1, and the fresh water source is tap water on land or fresh water purification equipment at sea. The fresh water connector 1 is connected to a ship water tank 4 to add fresh water to the ship water tank 4. The ship water tank 4 can store fresh water. When mixing is required, the fresh water in the ship water tank 4 is transported to the first mixing filter 9 through a fresh water delivery pump 6 for filtration and then transported to a mixed liquid tank 16. When the fresh water delivery pump 6 fails, the fresh water delivery pump 6 can be closed and the first valve 8 can be opened. The fresh water connector 1 is directly transported to the first mixing filter 9 through a bypass branch for filtration and then transported to the mixed liquid tank 16. In this way, when the fresh water delivery pump 6 fails, it can be ensured that the mixing process can continue, thereby improving the redundancy and reliability of the system; the ethylene glycol tank 11 transports ethylene glycol to the second mixing filter 901 through the ethylene glycol delivery pump 12 and then transports it to the mixed liquid tank 16 for filtration; the water-based soluble concentrate tank 13 transports the water-based soluble concentrate to the second mixing filter 901 through the water-based soluble concentrate delivery pump 14. The ethylene glycol delivery pump 12 is filtered by the device 901 and then delivered to the mixed liquid tank 16. When the ethylene glycol delivery pump 12 fails, the ethylene glycol delivery pump 12 is closed and the isolation valve 15 is opened. The ethylene glycol in the ethylene glycol tank 11 is delivered to the second mixed filter 901 through the spare branch and the water-based soluble concentrate delivery pump 14 for filtration and then delivered to the mixed liquid tank 16. When the water-based soluble concentrate delivery pump 14 fails, the water-based soluble concentrate delivery pump 14 is closed and the isolation valve 15 is opened. The water-based soluble concentrate in the water-based soluble concentrate tank 13 is delivered to the second mixed filter 901 through the spare branch and the ethylene glycol pump for filtration and then delivered to the mixed liquid tank 16. The mixed liquid tank 16 is connected to the hydraulic pump station interface 18 to deliver the mixed liquid, and then delivered to each hydraulic equipment through the hydraulic pump station. The setting of the spare branch ensures that when one of the ethylene glycol pump delivery pump or the water-based soluble concentrate delivery pump 14 fails, the entire mixing system can still mix the liquid normally, thereby improving the redundancy and reliability of the system.

[0056] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A non-return deepwater well control mixing system, characterized in that: It includes a fresh water joint, a marine water tank, a first mixing filter, a mixed liquid tank, an ethylene glycol tank, a water-based soluble concentrate tank, a second mixing filter and a hydraulic pump station interface; The fresh water connector is connected to the input end of the marine water tank, the output end of the marine water tank is connected to the input end of the first mixed filter, a fresh water delivery pump is connected in series between the output end of the marine water tank and the input end of the first mixed filter, the output end of the first mixed filter is connected to the mixed liquid tank, a bypass branch is also connected between the fresh water connector and the input end of the first mixed filter, and a first valve is connected to the bypass branch; The ethylene glycol tank is connected to the input end of the second hybrid filter, and an ethylene glycol delivery pump is connected in series between the ethylene glycol tank and the input end of the second hybrid filter; The water-based soluble concentrated liquid tank is connected to the input end of the second hybrid filter, and a water-based soluble concentrated liquid delivery pump is connected in series between the water-based soluble concentrated liquid tank and the second hybrid filter; A spare branch is connected between the input end of the ethylene glycol delivery pump and the input end of the water-based soluble concentrate delivery pump, and an isolation valve is connected to the spare branch; The mixed liquid cabinet is connected to the interface of the hydraulic pump station.

2. The non-return deepwater well control mixed liquid system according to claim 1, characterized in that: The output end of the fresh water joint is connected with a second valve and a disinfection and sterilization device, the second valve and the disinfection and sterilization device are connected in parallel, and the input end and the output end of the disinfection and sterilization device are respectively connected with a switch valve.

3. The non-return deepwater well control mixed liquid system according to claim 2, characterized in that: The disinfection and sterilization device is connected with a backwashing interface.

4. The non-return deepwater well control mixed liquid system according to claim 1, characterized in that: The output end of the marine water tank, the output end of the ethylene glycol tank and the output end of the water-based soluble concentrated liquid tank are all provided with a switch valve and a pre-pump filter.

5. The non-return deepwater well control mixed liquid system according to any one of claims 1 to 4, characterized in that: The mixed liquid cabinet is connected to a circulation pump, the output end of the mixed liquid cabinet is connected to the input end of the circulation pump, and the output end of the circulation pump is connected to the input end of the mixed liquid cabinet.

6. The non-return deepwater well control mixed liquid system according to any one of claims 1 to 4, characterized in that: A fresh water flow meter and a switch valve are connected between the first mixing filter and the mixed liquid tank, and a bypass valve is connected in parallel to the fresh water flow meter.

7. The non-return deepwater well control mixed liquid system according to any one of claims 1 to 4, characterized in that: The first hybrid filter includes two filters, which are arranged in parallel, and the second hybrid filter includes two filters, which are arranged in parallel.

8. The non-return deepwater well control mixed liquid system according to any one of claims 1 to 4, characterized in that: The input end of the marine water tank is provided with an automatic float valve, and the input end of the marine water tank is also connected with a bypass switch valve connected in parallel with the automatic float valve.

9. The non-return deepwater well control mixed liquid system according to any one of claims 1 to 4, characterized in that: The marine water tank, the ethylene glycol tank, the water-based soluble concentrate tank and the mixed liquid tank are respectively provided with liquid level switches.

10. An operating method of a non-return deepwater well control liquid mixing system, mixing liquid by using the non-return deepwater well control liquid mixing system as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: When fresh water is added through the marine water tank, the first valve is closed, the fresh water connector adds fresh water to the marine water tank, and the fresh water in the marine water tank is filtered through the first mixing filter and then transported to the mixed liquid tank; When fresh water is added through the bypass branch, the first valve is opened, the fresh water connector delivers fresh water through the first valve, and the fresh water is delivered to the mixed liquid tank after being filtered by the first mixing filter; Turning on the ethylene glycol delivery pump to deliver the ethylene glycol in the ethylene glycol tank to the second mixing filter for filtration and then to the mixed liquid tank; Turning on the water-based soluble concentrated liquid delivery pump to deliver the water-based soluble concentrated liquid in the water-based soluble concentrated liquid tank to the second mixing filter for filtration and then to the mixed liquid tank; When the ethylene glycol delivery pump fails, the ethylene glycol delivery pump is turned off and the isolation valve is opened, and the ethylene glycol in the ethylene glycol tank is delivered to the second mixed filter through the water-based soluble concentrated liquid delivery pump for filtration and then delivered to the mixed liquid tank; When the water-based soluble concentrate delivery pump fails, the water-based soluble concentrate delivery pump is turned off and the isolation valve is opened to deliver the water-based soluble concentrate in the water-based soluble concentrate tank through the ethylene glycol pump to the second mixing filter for filtration and then to the mixed liquid tank.

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