A simple deepwater well controlled liquid mixing system and operation method

Abstract

The present invention discloses a simple deepwater well control mixed liquid system, comprising a freshwater pipeline, an ethylene glycol tank, a water-based soluble concentrate tank, a main pipeline, a filter, a mixed liquid tank, and a hydraulic pump station interface. The freshwater pipeline is connected to the input end of the main pipeline, an opening valve and a flow meter are connected to the freshwater pipeline, the ethylene glycol tank is connected to the input end of the main pipeline, an ethylene glycol delivery pump is connected in series between the ethylene glycol tank and the input end of the main pipeline, the water-based soluble concentrate tank is connected to the input end of the main pipeline, the output end of the main pipeline is connected to the input end of the filter, the output end of the filter is connected to the mixed liquid tank, the mixed liquid tank is connected to the hydraulic pump station interface, and a liquid level switch is provided on the mixed liquid tank. The present invention can eliminate the need for a water tank, reduce occupied space, simplify the mixed liquid system, and thus reduce the probability of failure. The present invention also provides an operating method of the simple deepwater well control mixed liquid system.

Description

Technical Field

[0001] The present invention belongs to the field of deepwater drilling equipment, and in particular relates to a simple deepwater well control liquid mixing system and an operating 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. The deepwater well control mixing system, as the front end of the deepwater well control hydraulic control system, needs to supply the deepwater well control hydraulic control system with a control fluid with a suitable mixing ratio. At present, the existing water tank-type deepwater well control mixing system is relatively large in overall size, occupies a large amount of space in the drilling equipment, and the control system is relatively complex, and the probability of failure is increased. Therefore, in order to avoid the shortcomings of the existing technology, it is necessary to improve the existing technology. Summary of the Invention

[0003] The purpose of the present invention is to provide a simple deep-water well controlled liquid mixing system, which can eliminate the need for a water tank, reduce occupied space, simplify the liquid mixing system, and thus reduce the probability of failure. The present invention also provides an operating method for the simple deep-water well controlled liquid mixing system.

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

[0005] A simple deepwater well controlled mixed liquid system comprises a fresh water pipeline, an ethylene glycol tank, a water-based soluble concentrate tank, a main pipeline, a filter, a mixed liquid tank, and a hydraulic pump station interface. The fresh water pipeline is connected to the input end of the main pipeline, an opening valve and a flow meter are connected to the fresh water pipeline, the ethylene glycol tank is connected to the input end of the main pipeline, an ethylene glycol delivery pump is connected in series between the ethylene glycol tank and the input end of the main pipeline, the water-based soluble concentrate tank is connected to the input end of the main pipeline, a water-based soluble concentrate delivery pump is connected in series between the water-based soluble concentrate tank and the input end of the main pipeline, the output end of the main pipeline is connected to the input end of the filter, the output end of the filter is connected to the mixed liquid tank, the mixed liquid tank is connected to the hydraulic pump station interface, and a liquid level switch is provided on the mixed liquid tank, and the liquid level switch is respectively set to a first liquid level, a second liquid level, a third liquid level, and a fourth liquid level from high to low.

[0006] As a preferred solution of the above-mentioned simple deep-water well mixed liquid control system, there are three filters, and the three filters are connected in parallel.

[0007] As a preferred solution of the above-mentioned simple 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.

[0008] As a preferred solution of the above-mentioned simple deepwater well control mixed liquid system, the mixed liquid cabinet is provided with a return pipeline interface, and the return pipeline interface is connected to the hydraulic system of the hydraulic equipment.

[0009] As a preferred solution of the above-mentioned simple deepwater well control mixed liquid system, the mixed liquid cabinet is provided with an emergency standby interface for directly adding hydraulic control liquid.

[0010] As a preferred solution of the above-mentioned simple deepwater well controlled liquid mixing system, the opening type valve is an opening type remote control valve, and the flow meter is a non-contact flow meter.

[0011] As a preferred solution of the above-mentioned simple deepwater well controlled liquid mixing system, there are two opening type valves, and the two opening type valves are connected in parallel.

[0012] As a preferred solution of the above-mentioned simple deepwater well control mixed liquid system, the ethylene glycol tank, the water-based soluble concentrate tank and the mixed liquid tank are respectively provided with a breathable valve.

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

[0014] The present invention also provides an operating method of a simple deepwater well control liquid mixing system. Liquid mixing is performed using the simple deepwater well control liquid mixing system, comprising the following steps: opening the opening valve, opening the ethylene glycol delivery pump, and opening the water-based soluble concentrate delivery pump; fresh water, ethylene glycol, and water-based soluble concentrate are delivered to the filter through the main pipeline, and then delivered to the mixed liquid tank after being filtered by the filter;

[0015] When the liquid level of the mixed liquid tank rises to the highest first liquid level, the ethylene glycol delivery pump and the water-based soluble concentrate delivery pump are stopped, and the opening valve is closed;

[0016] When the liquid level of the mixed liquid tank drops to a second liquid level, the ethylene glycol delivery pump and the water-based soluble concentrate delivery pump are started, and the opening valve is started;

[0017] When the liquid level of the mixed liquid tank drops to the third liquid level, a low level alarm is issued;

[0018] When the liquid level of the mixed liquid tank drops to the fourth liquid level, the circulation pump and the hydraulic pump station pump group are stopped.

[0019] The simplified deepwater well controlled liquid mixing system provided by the present invention has the following beneficial effects compared with the prior art:

[0020] The present invention is connected to a fresh water source through a fresh water pipeline. The fresh water source is tap water on land or fresh water purification equipment at sea. The opening valve can adjust the valve opening to control the fluid flow. The opening is adjusted by the opening valve, and the input flow of fresh water is monitored by a flow meter. Fresh water is directly delivered, which does not require the installation of a water tank and reduces the occupied space. Since the main component of the mixed liquid used in deepwater well control is fresh water, the water tank is large and occupies more space in the drilling device. In this way, the fresh water delivery is controlled by the opening valve and the flow meter, so that the water tank does not need to be installed, which greatly reduces the space. It takes up little space. The glycol cabinet delivers ethylene glycol to the main line through the glycol delivery pump. The water-based soluble concentrate cabinet delivers water-based soluble concentrate to the main line through the water-based soluble concentrate delivery pump. Fresh water, ethylene glycol and water-based soluble concentrate are gathered into the main line and delivered to the filter through the main line. The clean mixed liquid is filtered through the filter and delivered to the mixed liquid cabinet for storage. The mixed liquid cabinet is connected to the hydraulic pump station interface to deliver the mixed liquid, which is then delivered to various hydraulic equipment through the hydraulic pump station. The entire mixed liquid system has a simple structure and can reduce the probability of failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] 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.

[0022] Figure 1 It is a schematic diagram of the simple deep-water well controlled mixed liquid system of the present invention.

[0023] Markings in the figure:

[0024] 1. Fresh water pipeline; 2. Opening valve; 3. Flow meter; 4. Breathing valve; 5. Liquid level switch; 6. Ethylene glycol tank; 7. Ethylene glycol delivery pump; 8. Water-based soluble concentrate tank; 9. Water-based soluble concentrate delivery pump; 10. Filter; 11. Mixing liquid tank; 12. Circulating pump; 13. Hydraulic pump station interface; 14. Return pipeline interface; 15. Emergency standby interface; 16. Main pipeline. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Please also refer to Figure 1 Now, the simple deepwater well controlled liquid mixing system provided by an embodiment of the present invention is described.

[0030] like Figure 1 As shown, the simple deepwater well control mixed liquid system of the present invention includes a fresh water pipeline, an ethylene glycol tank 6, a water-based soluble concentrate tank 8, a main line 16, a filter 10, a mixed liquid tank 11 and a hydraulic pump station interface 13. The fresh water pipeline is connected to the input end of the main line 16, and an opening valve 2 and a flow meter 3 are connected to the fresh water pipeline. The ethylene glycol tank 6 is connected to the input end of the main line 16, and an ethylene glycol delivery pump 7 is connected in series between the ethylene glycol tank 6 and the input end of the main line 16. The water-based soluble concentrate tank 8 It is connected to the input end of the main line 16, and a water-based soluble concentrate delivery pump 9 is connected in series between the water-based soluble concentrate tank 8 and the input end of the main line 16. The output end of the main line 16 is connected to the input end of the filter 10, and the output end of the filter 10 is connected to the mixed liquid tank 11. The mixed liquid tank 11 is connected to the hydraulic pump station interface 13. A liquid level switch 5 is provided on the mixed liquid tank 11, and the liquid level switch 5 is set to a first liquid level, a second liquid level, a third liquid level and a fourth liquid level from high to low.

[0031] Exemplarily, there are three filters 10, and the three filters 10 are connected in parallel. When the three filters 10 are connected in parallel, only one filter 10 will be opened during normal use. When the filter 10 fails, the other parallel filters 10 can be started for filtering to ensure normal filtering and improve the reliability of the system.

[0032] Exemplarily, the mixed liquid tank 11 is connected to a circulation pump 12. The output end of the mixed liquid tank 11 is connected to the input end of the circulation pump 12, and the output end of the circulation pump 12 is connected to the input end of the mixed liquid tank 11. The circulation pump 12 and the mixed liquid tank 11 form a circulation pipeline. The circulation pump 12 is started regularly to circulate and stir the mixed control liquid in the mixed liquid tank 11 to keep the mixed control liquid fully mixed. A filter is provided in front of the circulation pump 12 to filter the mixed control liquid.

[0033] Exemplarily, the mixed liquid cabinet 11 is provided with a reflux pipeline interface 14, 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 11 through the reflux pipeline interface 14, which is convenient for the reuse of the mixed liquid. The refluxed mixed liquid is transported to the circulation pipeline through the circulation pump 12 for filtration and then flows back to the mixed liquid cabinet 11. After filtration, it is transported to each hydraulic equipment through the hydraulic pump station interface 13 for continued use.

[0034] Exemplarily, the mixed liquid cabinet 11 is provided with an emergency backup interface 15 for directly adding hydraulic control fluid. The emergency backup interface 15 is used to directly add mixed control fluid to the mixed liquid cabinet 11 when the mixed liquid system fails, to ensure that the hydraulic equipment can maintain normal operation and improve the safety of the system.

[0035] Exemplarily, the opening valve 2 is a remote-controlled valve, and the flowmeter 3 is a non-contact flowmeter 3. The opening valve and non-contact flowmeter 3 can be used to remotely control and adjust the flow of fresh water, achieving accurate fresh water delivery without a water tank. The non-contact flowmeter 3 is used to measure the flow of fresh water flowing through the pipeline, and cooperates with the opening valve to remotely measure the fresh water flow. The opening valve is used to automatically control the amount of fresh water entering the mixing liquid tank 11. The opening value range is set according to the ratio of fresh water, ethylene glycol, and water-based soluble concentrate required for the intended wellhead environment. The valve is made of stainless steel, and its diameter / pressure is determined by the volume and pressure requirements of the mixing liquid tank 11. Pneumatic, electric, or other remote control methods can be selected. Specifically, the mixing liquid tank 11 is equipped with a liquid level gauge. In the event of a malfunction of the non-contact flowmeter 3, the liquid level gauge on the mixing liquid tank 11 can be used to observe the filling amount without affecting the continued operation of the system.

[0036] Exemplarily, there are two opening type valves 2, and the two opening type valves 2 are connected in parallel. When one of the opening type valves 2 fails, the other one can be started to maintain stable delivery of fresh water, ensuring stable and normal operation of the system.

[0037] Exemplarily, the ethylene glycol cabinet 6, the water-based soluble concentrate cabinet 8 and the mixed liquid cabinet 11 are respectively provided with a ventilation valve 4, which is connected to the external environment. The ventilation valve 4 is used for ventilation of the ethylene glycol cabinet 6, the water-based soluble concentrate cabinet 8 and the mixed liquid cabinet 11.

[0038] For example, the glycol tank 6 and the water-based soluble concentrate tank 8 are each equipped with a liquid level switch 5. The liquid level switches 5 are located at different heights on the glycol tank 6 and the water-based soluble concentrate tank 8 and are used to provide liquid level alarms and start and stop pump groups in the tanks, depending on functional requirements. Low-level switches are also provided on the glycol tank 6 and the water-based soluble concentrate tank 8 to provide low-level alarms and stop the glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9.

[0039] The present invention also provides an operating method of a simple deepwater well control liquid mixing system. Liquid mixing is performed using the simple deepwater well control liquid mixing system, comprising the following steps: opening the opening valve 2, opening the ethylene glycol delivery pump 7, and opening the water-based soluble concentrate delivery pump 9; fresh water, ethylene glycol, and water-based soluble concentrate are delivered to the filter 10 through the main pipe 16, and then delivered to the mixed liquid tank 11 after being filtered by the filter 10;

[0040] When the liquid level of the mixed liquid tank 11 rises to the highest first liquid level, the ethylene glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9 are stopped, and the opening valve 2 is closed to prevent the mixed liquid from overflowing the mixed liquid tank 11 and causing waste.

[0041] When the liquid level of the mixed liquid tank 11 drops to the second liquid level, the ethylene glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9 are started, and the opening valve 2 is started; when the liquid level drops to the second liquid level, the mixed liquid is promptly delivered to the mixed liquid tank 11 for replenishment.

[0042] When the liquid level of the mixed liquid tank 11 drops to the third liquid level, a low level alarm is issued; the staff checks whether the mixing system has any faults and manually adds mixed liquid to the mixed liquid tank 11; when the liquid level drops to the third liquid level, the operating power of the ethylene glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9 can be increased, and the opening of the opening valve 2 can be increased to achieve the effect of quickly replenishing the mixed liquid.

[0043] When the liquid level of the mixed liquid tank 11 drops to the fourth liquid level, the circulating pump 12 and the hydraulic pump station pump group are stopped; the mixed liquid system is repaired to prevent the circulating pump 12 from continuing to run and burning out when the liquid level is exhausted.

[0044] The mixed liquid tank 11 is equipped with liquid level switches 5 at different heights, with a first, second, third, and fourth liquid levels arranged from high to low. The highest first level stops the ethylene glycol delivery pump 7 and the water-soluble concentrate delivery pump 9. The second level starts the ethylene glycol delivery pump 7 and the water-soluble concentrate delivery pump 9. A low-level alarm is triggered at the third level, and the fourth level stops the circulation pump 12 and the hydraulic pump station pump group. The fresh water delivery, ethylene glycol delivery pump 7, and water-soluble concentrate delivery pump 9 operate independently to ensure stability. The fresh water, ethylene glycol delivery pump 7, and water-soluble concentrate delivery pump 9 are then filtered after being delivered to the main line 16. Since there is no chemical reaction between the fresh water, ethylene glycol, and water-soluble concentrate, they can all be gathered in the main line 16 and filtered using a common filter. This simplifies the structure of the entire mixed liquid system and reduces the probability of failure.

[0045] Specifically, in actual operation, the system selects the opening value of the remote-controlled valve based on the current wellhead environment. The system is set to automatic control mode. When the level switch 5 at the second level of the mixing liquid tank 11 is triggered, the remote-controlled valve opens to allow fresh water or water produced by the fresh water generator connected to the fresh water pipeline 1 to be added. The non-contact flowmeter 3 records the fresh water flow in real time. The ethylene glycol delivery pump 7 pumps an appropriate amount of ethylene glycol from the ethylene glycol tank 6 into the mixing liquid tank 11, and the water-based soluble concentrate pump pumps an appropriate amount of water-based soluble concentrate from the water-based soluble concentrate tank 8 into the mixing liquid tank 11. When the level switch 5 at the first level of the mixing liquid tank 11 is triggered, the remote-controlled valve closes, and all the above pumps stop operating, completing or terminating the current mixing operation. When the level switch 5 at the third level of the mixing liquid tank 11 is triggered, an audible and visual alarm will sound on the remote interface, notifying the operator that the fault needs to be corrected. When the fourth level switch 5 in the mixed liquid tank 11 is triggered, the system automatically stops the circulation pump 12 and the hydraulic pump station. When the low-level stop switch 5 in any glycol tank 6 or water-soluble concentrate tank 8 is triggered, the system issues an audible and visual alarm, and the glycol transfer pump 7 and the control fluid transfer pump simultaneously stop or remain stopped. Human intervention is required to troubleshoot the problem. Furthermore, the glycol transfer pump 7 and water-soluble concentrate transfer pump 9 can be manually adjusted on-site to meet the current operational flow rate, or the glycol transfer pump 7 can be manually isolated and shut down based on the current operational situation. This is a simple operation. In the event of a malfunction in the glycol transfer pump 7 or the water-soluble concentrate pump, manual emergency refilling can be performed through the emergency standby port 15 on the mixed liquid tank 11. 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 maintenance work based on the actual operational situation.

[0046] The simplified deepwater well controlled liquid mixing system provided by the present invention has the following beneficial effects compared with the prior art:

[0047] The present invention is connected to a fresh water source through a fresh water pipeline 1. The fresh water source is tap water on land or fresh water purification equipment at sea. The opening valve 2 can adjust the valve opening to control the fluid flow. The opening is adjusted by the opening valve 2, and the input flow of fresh water is monitored by the flow meter 3. Fresh water is directly transported, which does not require the installation of a water tank and reduces the occupied space. Since the main component of the mixed liquid used in deep-water well control is fresh water, the water tank is large in size and occupies more space in the drilling device. In this way, the fresh water delivery is controlled by the opening valve 2 and the flow meter 3, and the water tank does not need to be installed, which greatly reduces the occupied space. The ethylene glycol tank 6 transports ethylene glycol to the main line 16 through the ethylene glycol delivery pump 7, and the water-based soluble concentrate tank 8 transports the water-based soluble concentrate to the main line 16 through the water-based soluble concentrate delivery pump 9. Fresh water, ethylene glycol The glycol and water-based soluble concentrate are gathered into the main line 16 and transported to the filter 10 through the main line 16. The clean mixed liquid is filtered by the filter 10 and transported to the mixed liquid cabinet 11 for storage. The mixed liquid cabinet 11 is connected to the hydraulic pump station interface 13 to transport the mixed liquid, and then transported to various hydraulic equipment through the hydraulic pump station. The mixed liquid cabinet 11 is provided with liquid level switches 5 at different heights, and a first liquid level, a second liquid level, a third liquid level and a fourth liquid level are provided from high to low. The highest first liquid level is used to stop the ethylene glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9, and the ethylene glycol delivery pump 7 and the water-based soluble concentrate delivery pump 9 are started at the second liquid level. A low level alarm is issued at the third liquid level, and the circulation pump 12 and the hydraulic pump station pump group are stopped at the fourth liquid level. The entire mixed liquid system has a simple structure and can reduce the probability of failure.

[0048] 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 simple deepwater well controlled liquid mixing system, characterized in that: Including fresh water pipeline, ethylene glycol tank, water-based soluble concentrate tank, main line, filter, mixed liquid tank and hydraulic pump station interface; The fresh water pipeline is in communication with the input end of the main pipeline, and an opening valve and a flow meter are connected to the fresh water pipeline; The ethylene glycol tank is in communication with the input end of the main line, and an ethylene glycol delivery pump is connected in series between the ethylene glycol tank and the input end of the main line; The water-based soluble concentrated liquid tank is in communication with the input end of the main line, and a water-based soluble concentrated liquid delivery pump is connected in series between the water-based soluble concentrated liquid tank and the input end of the main line; The output end of the main line is connected to the input end of the filter, the output end of the filter is connected to the mixed liquid cabinet, and the mixed liquid cabinet is connected to the interface of the hydraulic pump station; The mixed liquid cabinet is provided with a liquid level switch, and the liquid level switch is respectively provided with a first liquid level, a second liquid level, a third liquid level and a fourth liquid level from high to low; There are three filters, and the three filters are connected in parallel; 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; The mixed liquid cabinet is provided with a return pipeline interface, and the return pipeline interface is connected to the hydraulic system of the hydraulic equipment; The opening type valve is an opening type remote control valve, and the flow meter is a non-contact flow meter; There are two opening type valves, and the two opening type valves are connected in parallel; The ethylene glycol cabinet, the water-based soluble concentrate cabinet, and the mixed liquid cabinet are respectively provided with ventilation valves.

2. The simple deepwater well controlled liquid mixing system according to claim 1, characterized in that: The mixed liquid cabinet is provided with an emergency standby interface for directly adding hydraulic control fluid.

3. The simple deepwater well controlled liquid mixing system according to claim 1, characterized in that: The ethylene glycol tank and the water-based soluble concentrate tank are respectively provided with liquid level switches.

4. A method for operating a simple deepwater well mixed liquid control system, characterized in that: Mixing liquids using the simplified deepwater well controlled liquid mixing system according to any one of claims 1 to 3 comprises the following steps: opening the opening valve, opening the ethylene glycol delivery pump, and opening the water-based soluble concentrate delivery pump; delivering fresh water, ethylene glycol, and water-based soluble concentrate to the filter through the main pipe, and then delivering the filtered liquid to the mixed liquid tank; When the liquid level of the mixed liquid tank rises to the highest first liquid level, the ethylene glycol delivery pump and the water-based soluble concentrate delivery pump are stopped, and the opening valve is closed; When the liquid level of the mixed liquid tank drops to a second liquid level, the ethylene glycol delivery pump and the water-based soluble concentrate delivery pump are started, and the opening valve is started; When the liquid level of the mixed liquid tank drops to the third liquid level, a low level alarm is issued; When the liquid level of the mixed liquid tank drops to the fourth liquid level, the circulation pump and the hydraulic pump station pump group are stopped.

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