A non-return deepwater well controlled liquid mixing system and operation method

Abstract

The present invention discloses a non-return deepwater well control liquid mixing system, wherein a fresh water connector is connected to the input end of a marine water tank, the output end of the marine water tank is connected to the input end of a first mixing filter, the output end of the first mixing filter is connected to a mixed liquid tank, and a bypass branch is connected between the fresh water connector and the input end of the first mixing filter; an ethylene glycol tank is connected to the input end of a second mixing filter; a water-based soluble concentrate tank is connected to the input end of the second mixing filter; a spare branch is connected between the input end of an ethylene glycol delivery pump and the input end of a water-based soluble concentrate delivery pump, and an isolation valve is connected to the spare branch. The present invention can transport fresh water, ethylene glycol, and water-based soluble concentrate through different pipelines for mixing, thereby preventing the mixing function of the entire system from being affected by a failure of a pump, and the system has high redundancy and reliability. The present invention also provides an operating method for the non-return deepwater well control liquid mixing system.

Description

Technical Field

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

[0002] Deepwater well control hydraulic control systems are key technologies used in deepwater oil and gas field development. They involve equipment that effectively controls wellheads under high pressure and in complex marine environments. These systems play a crucial role in the overall well control operation, directly impacting its proper and reliable operation. As the front-end of the deepwater well control hydraulic system, the deepwater well control mixing system must deliver a precisely mixed control fluid to the system. Deepwater well control mixing systems are primarily used for front-end fluid distribution within deepwater well hydraulic control systems. Based on their operating mode, they can be categorized as either non-return or return designs. In non-return deepwater well control mixing systems, the mixed fluid is discharged into the sea at the blowout preventer (BOP) and does not return to the mixing system. Existing non-return deepwater well control mixing systems have low redundancy and reliability. Different pumps typically draw and deliver the corresponding fluids from their respective tanks. Failure of a single pump can easily impact or even stall the entire system's mixing function. Furthermore, existing non-return deepwater well control mixing systems are typically directly refilled with ship-derived fresh water without additional disinfection and sterilization. This can easily lead to deterioration of the mixed control fluid, which can clog key BOP components and impact the entire deepwater well control operation. Therefore, to avoid the shortcomings of existing technologies, improvements are necessary. 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, thereby avoiding the failure of a pump that affects the mixing function of the entire system, 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 solutions adopted by the present invention are 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 controlled liquid mixing system, the disinfection and sterilization device is connected to a backwash interface.

[0008] As a preferred solution of the above-mentioned 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 controlled 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 mixing filter includes two filters, which are arranged in parallel, and the second mixing filter includes two filters, which are arranged in parallel.

[0012] As a preferred solution of the non-return deepwater well control mixing system, 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 to a bypass switch valve in parallel with the automatic float valve.

[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 operating method of a non-return deepwater well controlled liquid mixing system, wherein liquid mixing is performed by the non-return deepwater well controlled 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 filtered by the first mixing filter and then delivered to the mixed liquid tank;

[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 concentrate delivery pump to deliver the water-based soluble concentrate in the water-based soluble concentrate 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 shut down 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 concentrate 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, and the water-based soluble concentrate in the water-based soluble concentrate tank is delivered to the second mixing filter through the ethylene glycol pump for filtration and then delivered to the mixed liquid tank.

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

[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, and then transported to the mixed liquid tank after filtration. 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, and then transported to the mixed liquid tank after filtration. In this way, even when the fresh water delivery pump fails, the liquid mixing process can be ensured to continue, thereby improving the redundancy and reliability of the system; the ethylene glycol tank transports ethylene glycol to the second mixing filter through the ethylene glycol delivery pump, and then transports it to the mixed liquid tank after filtration. The water-based soluble concentrate tank transports the water-based soluble concentrate to the second The mixed filter is filtered and then transported to the mixed liquid tank. 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 tank is transported through the spare branch and the water-based soluble concentrate delivery pump to the second mixed filter for filtration and then transported to the mixed liquid tank. 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 tank is transported through the spare branch and the ethylene glycol pump to the second mixed filter for filtration and then transported to the mixed liquid tank. The mixed liquid tank 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 solutions of the embodiments of the present invention, the drawings of the embodiments 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. Return line interface; 20. Disinfection and sterilization device; 21. Backwash interface; 22. Bypass valve. DETAILED DESCRIPTION

[0027] The following describes embodiments of the present invention in detail. Examples of the embodiments 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 intended only to explain the present invention and are not to be construed 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., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They 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. Therefore, they cannot be understood as limitations on the present invention.

[0029] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting 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 refer to Figure 1 Now, the non-return deepwater well controlled liquid 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 includes a fresh water connector 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 connector 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, and a bypass branch is also connected between the fresh water connector 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 operation, since ethylene glycol and 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 backup branch line can be used to allow ethylene glycol to be delivered to the second mixed filter 901 through the water-based soluble concentrate delivery pump 14, or the water-based soluble concentrate is 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 operation, 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 operating 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 shut down and the isolation valve 15 is opened. The water-based soluble concentrate in the water-based soluble concentrate tank 13 is transported through the backup branch line by the ethylene glycol pump to the second mixing filter 901 for filtration, and then transported to the mixed liquid tank 16. This can prevent the failure of a pump from affecting the mixing function of the entire system, thereby improving the redundancy and reliability of the mixing system.

[0035] Illustratively, the output end of the fresh water connector 1 is connected to a second valve and a disinfection and sterilization device 20, the second valve and the disinfection and sterilization device 20 are connected in parallel, and the input and output ends of the disinfection and sterilization 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 and output ends of the disinfection and sterilization device 20 are opened, allowing the fresh water to pass through the disinfection and sterilization device 20 for disinfection and sterilization before flowing to the marine water tank 4 or the bypass branch. Disinfecting and sterilizing the fresh water can prevent the mixed control fluid from deteriorating, avoid clogging 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, which is provided to regularly backwash the disinfection and sterilization device 20. After a period of use, 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] Illustratively, 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 passing through the backup branch and entering the water-based soluble concentrate tank 13, and the water-based soluble concentrate is also prevented from passing through the backup branch and entering the ethylene glycol tank 11. The pre-pump filter 5 filters the liquid output from the tank to prevent impurities from damaging the various delivery pumps.

[0038] Exemplarily, the mixed liquid tank 16 is connected to a circulation pump 17. The output end of the mixed liquid tank 16 is connected to the input end of the circulation pump 17, and the output end of the circulation pump 17 is connected to the input end of the mixed liquid tank 16. The circulation pump 17 and the mixed liquid tank 16 form a circulation pipeline. The circulation pump 17 is started regularly to circulate and stir the mixed control liquid in the mixed liquid tank 16 to keep the mixed control liquid fully mixed. A filter is provided in front of the circulation pump 17 to filter the mixed control liquid.

[0039] Illustratively, 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, thereby determining 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 gauge on the mixed liquid tank 16 without affecting the continued operation of the system.

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

[0041] For example, the input end of the marine water tank 4 is provided with an automatic float valve 2, which is also connected to a bypass switch valve 201 in parallel with the automatic float valve 2. The automatic float valve 2 is provided on the marine water tank 4 for automatically replenishing the marine water tank 4. If the automatic float valve 2 fails, manual refilling can be selected through the bypass switch valve 201.

[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 each 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, 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 start the fresh water delivery pump 6, the ethylene glycol delivery pump 12 and the water-based soluble concentrate delivery pump 14 at the second liquid level, perform a low level alarm at the third liquid level, and stop the circulation pump 17 and the hydraulic pump station interface 18 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 cabinet 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 returned to the mixed liquid cabinet 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 cabinet 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 operating method of a non-return deepwater well controlled liquid mixing system, wherein liquid mixing is performed by the non-return deepwater well controlled 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 through 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, and the fresh water connector 1 delivers fresh water through the first valve 8. 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 mixed filter 901 for filtration and then to the mixed liquid tank 16;

[0049] Turn on the water-based soluble concentrate delivery pump 14 to deliver the water-based soluble concentrate in the water-based soluble concentrate 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, fresh water from a freshwater source or water produced by a seawater desalination device passes through a disinfection and sterilization device 20 and is automatically added to the ship's water tank 4 through an automatic float valve 2. When a liquid mixing operation is required, the freshwater delivery pump 6 extracts a fixed amount of water from the ship's 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. These are then delivered together to the mixed liquid tank 16 and further 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 freshwater delivery pump 6 fails, the freshwater from a freshwater source or water produced by a seawater desalination device can be directly fed into 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 in use and one in backup, further improving the reliability and flexible operability of the system, so that underwater well control operations can be carried out safely and reliably.

[0053] The mixing system is set to automatic operation. When the level switch 3 at the second level of the mixing tank 16 is triggered, the freshwater transfer pump 6 draws an appropriate amount of water from the marine water tank 4 and transfers it to the mixing tank 16. The ethylene glycol transfer pump 12 draws an appropriate amount of ethylene glycol from the ethylene glycol tank 11 and transfers it to the mixing tank 16. The water-based soluble concentrate pump draws an appropriate amount of water-based soluble concentrate from the water-based soluble concentrate tank 13 and transfers it to the mixing tank 16. When the level switch 3 at the first level of the mixing tank 16 is triggered, all of the above pumps stop, and the system completes or stops the current mixing operation. When the level switch 3 at the third level of the mixing tank 16 is triggered, an audible and visual alarm will sound on the remote interface, notifying the operator that action is required. When the level switch 3 at the fourth level of the mixing tank 16 is triggered, the system automatically stops the circulation pump 17 and the hydraulic pump station pumps. 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 simultaneously stop or remain in a pump-stop state, requiring human intervention 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 be manually adjusted to the flow rate required for the current operation on a remote panel or on site, or the ethylene glycol delivery pump 12 can be manually isolated and stopped on a remote panel or on site according to the current operating conditions. This is simple to operate and has strong system adaptability. When the fresh water delivery pump 6 fails, a bypass design can be selected, using a remote control valve to remotely control the delivery of fresh water from a fresh water source or produced water from a seawater desalination device to the mixed liquid tank 16. In addition, the ethylene glycol delivery pump 12 and the water-based soluble concentrate pump can serve as standby for each other as needed. If the system is in manual control mode, the operator can start and stop the corresponding pump group according to the actual working conditions, adjust the required flow rate and perform related inspection and maintenance work.

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

[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 marine water tank 4 to add fresh water to the marine water tank 4. The marine water tank 4 can store fresh water. When mixing is required, the fresh water in the marine water tank 4 is transported to the first mixing filter 9 through the fresh water delivery pump 6 for filtration and then transported to the 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 the bypass branch for filtration and then transported to the mixed liquid tank 16. In this way, even when the fresh water delivery pump 6 fails, the mixing process can be ensured to 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 through the water-based soluble concentrate delivery pump 14. The ethylene glycol in the ethylene glycol tank 11 is filtered by the filter 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 shut down 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 backup branch line 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 shut down 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 backup branch line 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, which is then delivered to various hydraulic equipment through the hydraulic pump station. The provision of the backup branch ensures that when either the ethylene glycol 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 controlled liquid mixing system, characterized in that: It includes fresh water connector, marine water tank, first mixing filter, mixed liquid tank, ethylene glycol tank, water-based soluble concentrate tank, second mixing filter and 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 hybrid 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 hybrid filter, the output end of the first hybrid filter is connected to the mixed liquid tank, a bypass branch is further connected between the fresh water connector and the input end of the first hybrid filter, and a first valve is connected to the bypass branch; The glycol tank is connected to the input end of the second hybrid filter, an ethylene glycol delivery pump is connected in series between the glycol tank and the input end of the second hybrid filter, and the output end of the second hybrid filter is connected to the mixed liquid tank; 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; The output end of the fresh water connector 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 end and output end of the disinfection and sterilization device are respectively connected to a switch valve; The disinfection and sterilization device is connected to a backwash interface; 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; The first hybrid filter includes two filters, which are arranged in parallel; the second hybrid filter includes two filters, which are arranged in parallel; 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 to a bypass switch valve in parallel with the automatic float valve.

2. The non-return deepwater well controlled mixed liquid system according to claim 1, 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.

3. The non-return deepwater well controlled mixed liquid system according to claim 1, 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 the fresh water flow meter is connected in parallel with a bypass valve.

4. The non-return deepwater well controlled liquid mixing system according to claim 1, 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.

5. A method for operating a non-return deepwater well control liquid mixing system, wherein liquid mixing is performed by using the non-return deepwater well control liquid mixing system according to any one of claims 1 to 4, 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 filtered by the first mixing filter and then delivered to the mixed liquid tank; 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 concentrate delivery pump to deliver the water-based soluble concentrate in the water-based soluble concentrate 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 shut down 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 concentrate 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, and the water-based soluble concentrate in the water-based soluble concentrate tank is delivered to the second mixing filter through the ethylene glycol delivery pump for filtration and then delivered to the mixed liquid tank.

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