Offshore platform water quality detection device

Abstract

The invention relates to an offshore platform water quality detection device, and belongs to the technical field of water quality detection equipment. The offshore platform water quality detection device comprises a base, a water conveying pipeline, an oil detector, a pH detector, a corrosion rate detector, a dissolved oxygen detector and a suspended matter detector, a pH detector, a corrosion rate detector, a dissolved oxygen detector and a suspended matter detector are mounted on the base at intervals; a cooler is arranged between the dissolved oxygen detector and the corrosion rate detector; a buffer tank is arranged on one side of the suspended matter detector; a waste discharge pump is arranged at one end of the buffer tank; a rectifier and an oil detector are arranged at the other end of the buffer tank; a water-taking pump and a hot water pump are mounted on one side of the rectifier in parallel. The water quality detection device for the offshore platform is compact in structure and ingenious in design, solves the problems that the water quality of injected water of an existing offshore platform needs to be manually sampled, packaged and returned to the land, and the timeliness of manual detection is poor, and is particularly suitable for on-site intelligent on-line monitoring of the water quality of the offshore platform.

Description

Technical Field

[0001] The present invention relates to a water quality detection device for an offshore platform, belonging to the technical field of water quality detection equipment. Background Art

[0002] In the field of offshore oil development technology, it is necessary to simultaneously conduct on-line monitoring of multiple parameters of the water quality for water injection on offshore platforms, such as oil in water, suspended solids, dissolved oxygen, corrosion rate, pH, etc., in order to achieve the purpose of timely adjusting the production water treatment process of offshore oilfields and timely guiding the water injection operation of offshore oilfields.

[0003] There are many existing multi-parameter water quality detection devices, which are usually only applicable to the detection of conventional water bodies such as river sewage and industrial wastewater. The detection working conditions are usually normal temperature and pressure, and there are no specific strict requirements for aspects such as the volume of the equipment, resistance to salt spray attack, corrosion resistance, explosion protection and protection level, and unattended operation. Therefore, such devices are usually not applicable to the on-line water quality monitoring of offshore oilfields.

[0004] The air on the offshore platform is humid and full of salt spray. Due to the change of day and night temperature difference, the salt spray in the air adheres to the equipment body and crystallizes and grows. The crystallization of air salt spray and the wild growth of salt crystals will quickly damage the sealing structure of offshore instruments. After the sealing structure is damaged, air and water infiltrate into the detection probe and damage the working chip of the probe, resulting in the short circuit and burning of the working chip, and making the instrument fail quickly.

[0005] The produced water in offshore oilfields is characterized by high temperature, high pressure, high salinity, high chloride ion content, and contains mineral oil, suspended solids, sulfides, carbon dioxide, sulfate-reducing bacteria, iron bacteria, saprophytic bacteria, and various oilfield development aids, etc. It belongs to a class of complex and extremely unstable water bodies with high temperature, high pressure, and strong corrosiveness. Such water bodies will quickly corrode and pollute the on-line monitoring probe under high temperature and high pressure conditions, especially when organic oil scale and inorganic dirt adhere to the sensitive parts of the sensor, the sensor will fail quickly.

[0006] The equipment for on-line monitoring of the water quality for water injection on offshore platforms is usually arranged in Area II of the offshore platform, and has high requirements for instrument explosion protection and protection, instrument space volume, instrument accuracy and precision, stability and reliability, etc. For some unmanned platforms, it is required that the equipment can operate continuously and stably for at least 30 days without human intervention.

[0007] Based on the above situation, it is necessary to develop a water quality detection device for an offshore platform to replace the high cost and timeliness problems of manual detection. Summary of the Invention

[0008] The object of the present invention is to provide a water quality detection device for an offshore platform with a compact structure and ingenious design, which solves the problem that the artificial detection of the water injection quality of the existing offshore platform requires sampling, encapsulation and transportation back to land, and artificial detection with multiple detection devices.

[0009] The technical solution of the present invention is as follows: A water quality detection device for an offshore platform includes a base, a water pipeline, an oil detector, a pH detector, a corrosion rate detector, a dissolved oxygen detector and a suspended solid detector; characterized in that: the pH detector, the corrosion rate detector, the dissolved oxygen detector and the suspended solid detector are installed at intervals on the base; a cooler is installed between the dissolved oxygen detector and the corrosion rate detector; a buffer tank is installed on one side of the suspended solid detector; a waste discharge pump is installed at one end of the buffer tank; a rectifier and an oil detector are installed at the other end of the buffer tank; a water intake pump and a hot water pump are installed in parallel on one side of the rectifier; the water intake pump is connected to the water pipeline; a detection pipeline is connected to one side of the water intake pump; the detection pipeline is connected in parallel with the oil detector and a detection branch pipe through the rectifier; one end of the oil detector and the detection branch pipe is connected in series with the pH detector, the corrosion rate detector, the cooler, the dissolved oxygen detector, the suspended solid detector and the buffer tank; the bottom end of the buffer tank is connected to the waste discharge pump through a waste discharge pipe.

[0010] The refrigerant inlet end of the cooler is connected with a cooling water pipe and a seawater valve; the refrigerant outlet end of the cooler is connected with a drain pipe.

[0011] The water quality detection device for the offshore platform further includes a chemical agent tank and a chemical agent dosing pump; a chemical agent tank, a chemical agent dosing pump and a clean water pump are installed on the base at one end of the oil detector; the chemical agent tank is connected in parallel with a cleaning pipeline and a circulation pipeline through the chemical agent dosing pump and a valve; the circulation pipeline is connected to the bottom end of the buffer tank through a cleaning pump.

[0012] The water quality detection device for the offshore platform further includes a clean water pipe; the clean water pipe is communicated with the inlet end of the rectifier through the hot water pump.

[0013] The water quality detection device for the offshore platform further includes a water distributor; the water distributor is connected to the chemical agent tank, the rectifier and the buffer tank through pipelines; the output end of the water distributor is connected to a liquid discharge ground pipe.

[0014] The advantages of the present invention are as follows: The water quality detection device for the offshore platform has a compact structure and ingenious design, can meet the needs of intelligent on-line monitoring of multiple parameters such as oil in water, suspended solids, dissolved oxygen, corrosion rate, pH, etc., solves the timeliness problem of artificial sampling, encapsulation and transportation back to land and artificial detection of the water injection quality of the existing offshore platform, and is especially suitable for the needs of intelligent on-line monitoring of the water quality of the offshore platform on site. Description of the Drawings

[0015] Figure 1Schematic structural diagram of the present invention; Figure 2 Schematic diagram of the detection pipeline of the present invention.

[0016] In the figure: 1, base; 2, pH detector; 3, corrosion rate detector; 4, dissolved oxygen detector; 5, suspended solid detector; 6, cooler; 7, buffer tank; 8, waste discharge pump; 9, rectifier; 10, oil detector; 11, water intake pump; 12, hot water pump; 13, water delivery pipeline; 14, detection pipeline; 15, detection branch pipe; 16, waste discharge pipe; 17, chemical agent tank; 18, chemical agent dosing pump; 19, clean water pump; 20, cleaning pipeline; 21, circulation pipeline; 22, cleaning pump; 23, clean water pipe; 24, water distributor; 25, liquid discharge ground pipe. Specific embodiments

[0017] The water quality detection device for the offshore platform includes a base 1, a water delivery pipeline 13, an oil detector 10, a pH detector 2, a corrosion rate detector 3, a dissolved oxygen detector 4 and a suspended solid detector 5 (see the attached Figure 1 and 2 ).

[0018] The pH detector 2, the corrosion rate detector 3, the dissolved oxygen detector 4 and the suspended solid detector 5 are installed on the base 1 at intervals; a cooler 6 is installed between the dissolved oxygen detector 4 and the corrosion rate detector 3; a buffer tank 7 is installed on one side of the suspended solid detector 5; a waste discharge pump 8 is installed at one end of the buffer tank 7; a rectifier 9 and an oil detector 10 are installed at the other end of the buffer tank 7; a water intake pump 11 and a hot water pump 12 are installed side by side on one side of the rectifier 9 (see the attached Figure 1 ). The rectifier 9 is an off-the-shelf device, and the rectifier 9 has the functions of exhausting gas and filtering particulate matter.

[0019] The water intake pump 11 is connected to the water delivery pipeline 13; a detection pipeline 14 is connected to one side of the water intake pump 11; the detection pipeline 14 is connected in parallel with the oil detector 10 and a detection branch pipe 15 through the rectifier 9; one ends of the oil detector 10 and the detection branch pipe 15 are connected in series with the pH detector 2, the corrosion rate detector 3, the cooler 6, the dissolved oxygen detector 4, the suspended solid detector 5 and the buffer tank 7.

[0020] The bottom end of the buffer tank 7 is connected to the waste discharge pump 8 through a waste discharge pipe 16 (see the attached Figure 2 ).

[0021] The liquid in the buffer tank 7 can be discharged externally through the waste discharge pipe 16 and the waste discharge pump 8.

[0022] The water quality of the injected water input through pipeline 14 (at around 70 °C) can be detected for the oil content in the water by the oil detector 10, and then merged with the water quality of the injected water in the detection branch pipe 15 and detected by the pH detector 2 and the corrosion rate detector 3. In this way, the purpose of small-flow detection by the oil detector 10 and large-flow detection by the pH detector 2 and the corrosion rate detector 3 can be achieved.

[0023] The water quality of the injected water after being detected by the corrosion rate detector 3 is cooled to below 30 °C by the cooler 6 and then detected by the dissolved oxygen detector 4 and the suspended solid detector 5 and then flows into the buffer tank 7.

[0024] The refrigerant inlet end of the cooler 6 is connected with a cooling water pipe and a seawater valve (not shown in the attached drawings of the specification); the refrigerant outlet end of the cooler 6 is connected with a drain pipe. During operation, the cooling seawater can enter the cooler 6 through the cooling water pipe and the seawater valve to cool the water quality of the injected water and then be discharged into the sea through the drain pipe. In this way, the purpose of using seawater to cool the cooler 6 can be achieved.

[0025] In this way, the water quality detection device on the offshore platform can both detect the water quality of the injected water at around 70 °C through the pH detector 2 and the corrosion rate detector 3, and detect the water quality of the injected water using the dissolved oxygen detector 4 and the suspended solid detector 5 at below 30 °C.

[0026] The water quality detection device on the offshore platform further includes a chemical agent tank 17 and a chemical agent dosing pump 18; a chemical agent tank 17, a chemical agent dosing pump 18 and a clean water pump 19 are installed on the base 1 at one end of the oil detector 10; the chemical agent tank 17 is connected in parallel with a cleaning pipeline 20 and a circulation pipeline 21 through the chemical agent dosing pump 18 and a valve; the circulation pipeline 21 is connected to the bottom end of the buffer tank 7 through a cleaning pump 22 (see the attached Figure 1 and 2 )

[0027] During operation, after injecting the cleaning liquid into the chemical agent tank 17, the chemical agent dosing pump 18 can input the cleaning liquid in the chemical agent tank 17 into the rectifier 9 through the chemical agent dosing pump 18, and then the chemical agent dosing pump 18 is closed; then the cleaning pump 22 is started, so that the cleaning pump 22 circulates the cleaning agent entering the rectifier 9 continuously in the circulation line formed by connecting the pH detector 2, the corrosion rate detector 3, the cooler 6, the dissolved oxygen detector 4, the suspended solid detector 5, the buffer tank 7 and the circulation pipeline 21 at one end of the oil detector 10 and the detection branch pipe 15 to achieve the purpose of cleaning each detection instrument.

[0028] The water quality detection device on the offshore platform further includes a clean water pipe 23; the clean water pipe 23 is communicated with the inlet end of the rectifier 9 through a hot water pump 12 (see the attached Figure 1 and 2 )

[0029] The purpose of providing the clean water pipe 23 and the hot water pump 12 is to enable the clean water to be heated by the hot water pump 12 and then input into each detection instrument through the clean water pipe 23 for further cleaning after the cleaning liquid is used for cleaning during operation.

[0030] The offshore platform water quality detection device also includes a water divider 24; the water divider 24 is connected to the reagent tank 17, the rectifier 9 and the buffer tank 7 through a pipeline; the output end of the water divider 24 is connected to a drainage pipe 25 (see the attached manual Figure 1 and 2 ).

[0031] The purpose of setting the water separator 24 is to enable the gas discharged from the reagent tank 17, the rectifier 9 and the buffer tank 7 to enter the water separator 24 during operation, and the water separator 24 separates the gas entering therein into gas and liquid, and the separated liquid is finally discharged to the outside through the drainage pipe 25.

[0032] When the offshore platform water quality detection device is in operation, the water quality of the injection water is input into the detection pipeline 14 under the operation of the water intake pump 2 .

[0033] The injection water quality (about 70℃) entering the detection pipeline 14 is first tested by the oil tester 10 for oil content in the water, and then merged with the injection water quality in the detection branch pipe 15 and tested by the PH tester 2 and the corrosion rate tester 3. Then the injection water quality tested by the corrosion rate tester 3 is cooled to below 30℃ by the cooler 6, and then tested by the dissolved oxygen tester 4 and the suspended matter tester 5 before flowing into the buffer tank 7. In this way, the process can complete the oil content detection, PH detection, corrosion rate detection, dissolved oxygen detection and suspended matter detection in water (see the attached manual Figure 2 ).

[0034] After the above tests are completed, the cleaning liquid is injected into the reagent tank 17, and the dosing pump 18 can input the cleaning liquid in the reagent tank 17 into the rectifier 9 through the dosing pump 18, and then the dosing pump 18 is turned off; then the cleaning pump 22 is started, so that the cleaning pump 22 will allow the cleaning agent entering the rectifier 9 to circulate continuously in the circulation circuit formed by the PH detector 2, the corrosion rate detector 3, the cooler 6, the dissolved oxygen detector 4, the suspended matter detector 5, the buffer tank 7 and the circulation pipeline 21 connected in series at one end of the oil measuring instrument 10 and the detection branch pipe 15, so as to achieve the purpose of cleaning each detection instrument.

[0035] After the cycle cleaning is completed, the clean water is heated by the hot water pump 12 and then input into each detection instrument through the clean water pipe 23 for further cleaning, and the cleaning water is finally discharged through the waste pipe 16 and the waste pump 8. At this point, the multi-parameter online monitoring device has completed the cleaning work and can enter the next working cycle.

[0036] This water quality detection device for offshore platforms is compact in structure and ingenious in design. It can meet the needs of intelligent on-line monitoring of multiple parameters such as oil in water, suspended solids, dissolved oxygen, corrosion rate, pH, etc. It solves the timeliness problem of manual sampling, packaging and returning to land for manual detection of the injected water quality of existing offshore platforms, and is especially suitable for the needs of on-site intelligent on-line monitoring of water quality on offshore platforms.

Claims

1. An offshore platform water quality detection device, comprising a base (1), a water pipeline (13), an oil detector (10), a pH detector (2), a corrosion rate detector (3), a dissolved oxygen detector (4) and a suspended matter detector (5); characterized in that: The base (1) is provided with a pH detector (2), a corrosion rate detector (3), a dissolved oxygen detector (4) and a suspended matter detector (5) at intervals; a cooler (6) is provided between the dissolved oxygen detector (4) and the corrosion rate detector (3); a buffer tank (7) is provided on one side of the suspended matter detector (5); a waste discharge pump (8) is provided at one end of the buffer tank (7); a rectifier (9) and an oil measuring instrument (10) are provided at the other end of the buffer tank (7); a water intake pump (11) and a hot water pump (12) are provided in parallel on one side of the rectifier (9); the water delivery pipeline (13) is connected to a water intake pump (11); one side of the water intake pump (11) is connected to a detection pipeline (14); the detection pipeline (14) is connected in parallel to an oil measuring instrument (10) and a detection branch pipe (15) through a rectifier (9); one end of the oil measuring instrument (10) and the detection branch pipe (15) is connected in series to a pH detector (2), a corrosion rate detector (3), a cooler (6), a dissolved oxygen detector (4), a suspended matter detector (5) and a buffer tank (7); the bottom end of the buffer tank (7) is connected to a waste discharge pump (8) through a waste discharge pipe (16).

2. The offshore platform water quality detection device according to claim 1, characterized in that: The refrigerant inlet end of the cooler (6) is connected to a cooling water pipe and a seawater valve; the refrigerant outlet end of the cooler (6) is connected to a drain pipe.

3. The offshore platform water quality detection device according to claim 1, characterized in that: The offshore platform water quality detection device further comprises a reagent tank (17) and a reagent dosing pump (18); the reagent tank (17), the reagent dosing pump (18) and the clean water pump (19) are mounted on a base (1) at one end of the oil measuring instrument (10); the reagent tank (17) is connected in parallel with a cleaning pipeline (20) and a circulation pipeline (21) via the reagent dosing pump (18) and a valve; the circulation pipeline (21) is connected to the bottom end of the buffer tank (7) via the cleaning pump (22).

4. The offshore platform water quality detection device according to claim 1, characterized in that: The offshore platform water quality detection device further comprises a clean water pipe (23); the clean water pipe (23) is connected to the inlet end of the rectifier (9) via a hot water pump (12).

5. The offshore platform water quality detection device according to claim 1, characterized in that: The offshore platform water quality detection device further comprises a water separator (24); the water separator (24) is connected to the reagent tank (17), the rectifier (9) and the buffer tank (7) via pipelines; and the output end of the water separator (24) is connected to a drainage ground pipe (25).

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