An online monitoring and calibration system for oil water content

Abstract

The invention belongs to the technical field of petroleum water content meters, and specifically is an online monitoring and calibration system for petroleum water content, which is used for calibrating a measurement execution system and comprises an automatic liquid preparation module and a circulation module; the automatic liquid preparation module is used to prepare sample liquids at different calibration points, and compared with manual sample liquid preparation, the sample liquid preparation time is shortened, and errors in the oil / water ratio of the sample liquid caused by intermediate links are avoided, and traceability is performed at the same time, thereby improving the efficiency of measuring the water content of the sample liquid; when the sample liquid with a specified oil / water ratio is input into the circulation module, a central control module determines that the sample liquid circulates in the circulation module to measure the water content, and the sample liquid temperature is measured and fed back to control the automatic temperature control module to adjust the temperature of the sample liquid, so that after the sample liquid circulates in the circulation module for multiple times, the oil and water are fully separated, so that the water content meter measures the water content of the sample liquid more accurately and with smaller errors.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum water content meters, in particular to an online monitoring and calibration system for petroleum water content. Background Art

[0002] The water content of oil refers to the ratio of the volume of associated water in oil to the volume of the oil-water mixture. It is one of the important parameters of oil and an indicator that is focused on in the processes of oil extraction, dehydration, storage, transportation, sales and refining.

[0003] If the measurement results of oil water content are inaccurate, it will affect the economic interests of both supply and demand parties during trade settlement and easily cause trade disputes; in the production process, it will affect the decision-making of process control and cause inaccurate process control.

[0004] With the intelligent development of domestic oil fields, the types of oil water content testers (water content meters for short) are becoming more and more diverse, and their importance is becoming increasingly prominent. Customers' demand for full-range instruments is increasing, and it is urgent to develop intelligent verification / calibration devices for full-range oil water content testers. This project aims to address the problems of small measurement range, low degree of automation in the verification process, and manual recording of test data in the verification device of oil water content testers in JJG899-1995 "Verification Regulations for Oil Low Water Content Analyzers";

[0005] To this end, the present invention provides an online monitoring and calibration system for petroleum water content. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: an online monitoring and calibration system for water content in petroleum described in the present invention is used to calibrate the measurement execution system, including:

[0008] Automatic liquid preparation module, used to accurately prepare sample liquids for multiple calibration points and inject liquid into the circulation module;

[0009] A circulation module, used for inputting a sample liquid and obtaining a measured water content of the sample liquid;

[0010] Automatic temperature control module, used to adjust the sample liquid temperature;

[0011] An intelligent control system outputs a measurement execution instruction to control the measurement execution system, and the intelligent control system includes:

[0012] A central control module is used to control the measurement execution system to execute the measurement task;

[0013] The data intelligent collection and processing module is used to collect the status data of the sample liquid, including the measured water content of the sample liquid, and generate a temperature-based water content comparison table according to the measured water content and the prepared water content of the sample liquid; the prepared water content is obtained during the sample liquid preparation stage;

[0014] The intelligent control system controls the measurement execution system to measure the water content of the sample liquid at multiple calibration points, and obtains the measured water content of the sample liquid to calibrate the measurement execution system's measurement result of the water content of the sample liquid;

[0015] It also includes a display module, which is used to display the calculated water content of the sample liquid.

[0016] Preferably, the method by which the central control module controls the measurement execution system to perform the measurement task is:

[0017] receiving a calibration instruction;

[0018] Automatically generate measurement execution instructions based on calibration instructions;

[0019] The method for the measurement execution system to perform the measurement task is:

[0020] receiving a measurement execution instruction; the measurement execution instruction carries the oil / water ratio of the sample liquid;

[0021] According to the oil / water ratio of the sample liquid in the measurement execution instruction, the sample liquid preparation and injection are completed;

[0022] The sample liquid with the specified oil / water ratio enters the circulation module, and the temperature is controlled by the automatic temperature control module to complete the full separation of oil and water;

[0023] The water content of the sample liquid is then tested using a water content meter.

[0024] Preferably, the measurement execution instructions include liquid preparation task instructions and cycle measurement instructions; the central control module is also used to output temperature control instructions and waste liquid discharge instructions;

[0025] The liquid preparation task instruction is generated according to the predetermined oil / water ratio of the sample liquid, and is used to prepare the sample liquid with the specified oil / water ratio;

[0026] The circulation measurement instruction is generated according to the sample solution preparation completion instruction and is used to control the sample solution to enter the circulation module;

[0027] The temperature control instruction is generated according to the measurement result of the water content of the sample liquid, and is used to adjust the temperature of the sample liquid when the measurement result of the water content of the sample liquid does not match the prepared water content of the sample liquid;

[0028] The waste liquid discharge instruction is generated according to the measurement result of the water content of the sample liquid, and is used to control the sample liquid to be discharged into the waste liquid pool when the measurement result of the water content of the sample liquid is consistent with the prepared water content of the sample liquid.

[0029] Preferably, the method for the automatic liquid dispensing module to automatically and accurately dispense liquid is:

[0030] Receive liquid preparation task instructions and prepare liquid according to the liquid preparation task instructions, including setting up independent square oil tanks and square water tanks;

[0031] Automatic injection metering device is used to accurately extract oil and water from the square oil tank and square water tank respectively;

[0032] The oil and water are transmitted separately through independent pipelines and collected before injection to complete the liquid preparation and output the sample liquid preparation completion instruction;

[0033] Among them, the output ports of the square oil tank and the square water tank are connected to independent pipelines, and the two independent pipelines are connected to the liquid distribution pipeline; the automatic injection metering device is arranged in the independent pipeline, and the oil and water are collected in the liquid distribution pipeline.

[0034] Preferably, the circulation module is also used to receive a sample liquid preparation completion instruction and receive the prepared sample liquid, and the circulation module includes a sample liquid injection port, an exhaust port, a sample liquid circulation pipeline, and an online density meter, a pressure transmitter, a temperature transmitter, a flow meter, a water content meter and a pump arranged on the sample liquid circulation pipeline;

[0035] The sample liquid is connected to the sample liquid injection port through the liquid preparation pipeline after the liquid preparation;

[0036] The automatic temperature control module comprises a low temperature constant temperature device and a temperature control pipeline, wherein the temperature control pipeline is connected to the low temperature constant temperature device; the temperature control pipeline is arranged at any section of the sample liquid circulation pipeline.

[0037] Preferably, the method in which the central control module controls the sample liquid circulation to measure the water content is:

[0038] Obtain the prepared water content of the sample solution, that is, the oil / water ratio of the sample solution;

[0039] When the measured water content of the sample solution does not match the prepared water content of the sample solution, the central control module outputs a cyclic measurement instruction;

[0040] The method for measuring the water content of the sample liquid by the circulation module is:

[0041] Receive the cyclic measurement instruction, control the sample liquid to circulate in the sample liquid circulation pipeline, and repeat the measurement;

[0042] The water content of the sample liquid is measured cyclically until the measured water content of the sample liquid is consistent with the prepared water content of the sample liquid, thereby completing the measurement of the water content of the sample liquid;

[0043] The sample liquid after measurement is output to the waste liquid tank.

[0044] Preferably, the method in which the central control module controls the automatic temperature control module to adjust the temperature is:

[0045] Acquire the status data of the sample liquid based on the data intelligent acquisition and processing module;

[0046] When the measured water content of the sample liquid is lower than the configured water content, the central control module outputs a temperature control instruction;

[0047] When the measured water content of the sample liquid no longer changes with the temperature, the central control module outputs a command to maintain a constant temperature;

[0048] The automatic temperature control module is used to receive temperature control instructions and adjust the temperature based on a low-temperature constant temperature device; the automatic temperature control module is also used to receive instructions for maintaining a constant temperature and, when the measured water content of the sample liquid no longer changes with temperature, maintain the temperature of the sample liquid based on the low-temperature constant temperature device.

[0049] Preferably, the method by which the data intelligent acquisition and processing module acquires the state data of the sample liquid is:

[0050] After the sample liquid is input into the sample liquid circulation pipeline through the sample liquid injection port, the status data of the sample liquid, including density, pressure, temperature, flow rate and water content, are collected through the online density meter, pressure transmitter, temperature transmitter, flow meter and water content meter;

[0051] The online density meter, pressure transmitter, temperature transmitter, flow meter, and water content meter communicate with the data intelligent acquisition and processing module.

[0052] Preferably, the intelligent control system further comprises a data storage module, and the data storage module is used to store raw data when the measurement execution system is running, and the raw data comprises the measured water content, pressure, temperature, flow rate and density of the sample liquid.

[0053] Preferably, the intelligent control system further comprises an early warning module, which is used to output an alarm signal: when the measured value of the pressure transmitter exceeds a threshold value, the data intelligent acquisition and processing module communicates with the early warning module, causing the early warning module to output an alarm signal.

[0054] The beneficial effects of the present invention are as follows:

[0055] 1. The online monitoring and calibration system for the water content of petroleum described in the present invention uses an automatic liquid preparation module in the measurement execution system to prepare sample liquids for different calibration points. Compared with manual sample liquid preparation, the sample liquid preparation time is shortened, and errors in the oil / water ratio of the sample liquid caused by intermediate links are avoided. At the same time, traceability is possible, which improves the efficiency of measuring the water content of the sample liquid. When the sample liquid with a specified oil / water ratio is input into the circulation module, the central control module decides that the sample liquid circulates in the circulation module to measure the water content, and controls the automatic temperature control module to adjust the temperature of the sample liquid by measuring and feeding back the sample liquid temperature, so that after the sample liquid circulates in the circulation module for multiple times, the oil and water are fully separated, so that the water content meter can measure the water content of the sample liquid more accurately and with smaller errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The present invention will be further described below in conjunction with the accompanying drawings.

[0057] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0058] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0059] like Figure 1 As shown, an online monitoring and calibration system for water content in petroleum described in an embodiment of the present invention is used to calibrate a measurement execution system, and includes an automatic liquid preparation module, a circulation module, an automatic temperature control module, and an intelligent control system, wherein the automatic liquid preparation module is used to accurately configure sample liquids at multiple calibration points and inject liquid into the circulation module; the circulation module is used to input sample liquids and obtain the measured water content of the sample liquids; the automatic temperature control module is used to adjust the temperature of the sample liquid; the intelligent control system is used to output measurement execution instructions to control the measurement execution system, and the intelligent control system includes a central control module and a data intelligent acquisition and processing module; wherein the central control module is used to control the measurement execution system to perform measurement tasks; the data intelligent acquisition and processing module is used to collect status data of the sample liquid, including the measured water content of the sample liquid, and generate a temperature-based water content comparison table according to the measured water content and the prepared water content of the sample liquid; the prepared water content is obtained during the sample liquid preparation stage;

[0060] The intelligent control system controls the measurement execution system to measure the water content of the sample liquid at multiple calibration points, and obtains the measured water content of the sample liquid to calibrate the measurement execution system's measurement result of the water content of the sample liquid;

[0061] It also includes a display module, which is used to display the calculated water content of the sample liquid.

[0062] Since the existing petroleum water content tester calibration device has the problems of small measurement range, low automation degree of calibration process, manual recording of detection data, etc., as an embodiment of the present invention, when calibrating the petroleum water content tester, the intelligent control system outputs the measurement execution instruction, controls the measurement execution system to prepare sample liquids of multiple calibration points into the circulation module, so as to measure the petroleum water content. Among them, the automatic liquid preparation module is used in the measurement execution system to prepare the sample liquids of different calibration points. Compared with the manual preparation of the sample liquid, the sample liquid preparation time is shortened, and the oil / water ratio of the sample liquid caused by the intermediate links is avoided. Error, and can be traced, which improves the efficiency of measuring the water content of the sample liquid. When the sample liquid with a specified oil / water ratio is input into the circulation module, the central control module decides that the sample liquid circulates in the circulation module to measure the water content, and controls the automatic temperature control module to adjust the temperature of the sample liquid in a step-by-step manner by measuring and feeding back the sample liquid temperature, for example, adjusting the temperature of the sample liquid in units of 1°C, so that after the sample liquid circulates in the circulation module for many times, the oil and water are fully separated, so that the water content meter can measure the water content of the sample liquid more accurately and with smaller errors. In addition, in this process, the state data of the sample liquid can be collected by the data intelligent acquisition and processing module;

[0063] In one embodiment, in order to calibrate the moisture content tester, sample solutions with different calibration points may be preferably set, such as equal volumes of sample solutions with moisture contents of 0%, 20%, 40%, 60%, 80%, and 100% for moisture content testing. If, during the application phase, the moisture content measurement result is inconsistent with the prepared moisture content after the sample solution has been circulated for a period of time, it indicates that the measurement result of the moisture content tester is abnormal. The abnormal reasons include abnormal settings of the moisture content tester, imbalance of the oil / water ratio of the sample solution, and impurities that may still exist in the circulation module. After excluding the abnormal measurement result of the moisture content tester caused by the above factors, if the moisture content tester is used In the stage, assuming that after a period of circulation, the sample liquid with a water content of 20% has a water content measurement result of 18%, which is still inconsistent with the prepared water content, and there are no other problems after inspection, a comparison table of the measured water content and the prepared water content is generated based on the ambient temperature, that is, at this ambient temperature, when the measured water content obtained by the equipment is 18%, the corresponding prepared water content should be 20%; that is, the display module operation can modify the measured water content of the crude oil to 20% and display it, so as to correct the test result of the water content tester on the water content of crude oil in the formal application stage, so as to avoid errors and trade disputes;

[0064] For example, taking a sample liquid with a water content of 20%, taking temperature as an influencing factor, obtain the test water content of the sample liquid and draw a comparison table:

[0065] temperature Test moisture content Moisture content 10℃ 19.684% 20% 15℃ 19.012% 20% 20℃ 18.722% 20% 25℃ 18.421% 20% 30℃ 18.227% 20% 35℃ 17.958% 20%

[0066] The comparison table is a moisture content comparison table of the measured moisture content and the prepared moisture content of the sample liquid generated based on the temperature; the prepared moisture content is obtained during the sample liquid preparation stage; based on the above, in the absence of other influencing factors, temperature has an impact on the test moisture content of the sample liquid, and the linear relationship between the test moisture content and the prepared moisture content of the sample liquid at different temperatures is obtained through the comparison table and the collected test moisture content of the sample liquid at different calibration points, and based on the linear relationship and the test moisture content, the calculated moisture content of the sample liquid is automatically obtained, and then it is shown that it is worth noting that the error between the calculated moisture content and the prepared moisture content of the crude oil can be reduced to within the limit, thereby avoiding trade disputes.

[0067] In one embodiment, the method by which the central control module controls the measurement execution system to perform the measurement task is:

[0068] receiving a calibration instruction;

[0069] Automatically generate measurement execution instructions based on calibration instructions;

[0070] The method for the measurement execution system to perform the measurement task is:

[0071] receiving a measurement execution instruction; the measurement execution instruction carries the oil / water ratio of the sample liquid;

[0072] According to the oil / water ratio of the sample liquid in the measurement execution instruction, the sample liquid preparation and injection are completed;

[0073] The sample liquid with the specified oil / water ratio enters the circulation module, and the temperature is controlled by the automatic temperature control module to complete the full separation of oil and water;

[0074] The water content of the sample liquid is then tested using a water content meter.

[0075] As an embodiment of the present invention, when calibrating the moisture content tester, a calibration instruction is first issued, and the central control module receives the calibration instruction, and then generates a measurement execution instruction according to the calibration instruction. The measurement execution system receives the measurement execution instruction and configures the sample liquid according to the oil / water ratio of the sample liquid carried in the measurement execution instruction. The oil / water ratio of the sample liquid is the set calibration point, such as a sample liquid with a moisture content of 10%. After the sample liquid is configured, it is input into the circulation module, and the temperature of the sample liquid is controlled by the automatic temperature control module so that the oil and water in the sample liquid are fully separated. During the circulation of the sample liquid, the moisture content of the sample liquid is recorded multiple times in a time series. If the measured moisture content of the sample liquid does not match the prepared moisture content all the time, it may be that the moisture meter is set incorrectly. After checking that the moisture meter is set correctly, the moisture content is measured again until the measured moisture content no longer changes with the temperature adjustment. At this time, the calculated moisture content of the sample liquid is automatically obtained according to the measured moisture content obtained at different temperatures and the prepared moisture content of the sample liquid, so as to display and complete the calibration of the moisture content tester.

[0076] Among them, the calibration of the moisture content tester adopts zero point calibration and full scale calibration;

[0077] Zero point calibration: Use anhydrous or low-water content solution to perform zero point calibration on the instrument to eliminate the systematic error of the instrument;

[0078] Full-scale calibration: Use a standard solution with high water content to perform full-scale calibration on the instrument to determine the maximum measuring range of the instrument;

[0079] In addition, in order to ensure that the tester can output accurate readings within the entire measurement range (such as 0% to 100% water content), it is also necessary to calibrate at different water content points, such as 20%, 60%, and 100% water content; based on the above, the full-scale verification / calibration of the petroleum water content tester is achieved, that is, the measurement range is (0~100)% volume water content.

[0080] In one embodiment, the measurement execution instruction includes a liquid preparation task instruction and a cycle measurement instruction; the central control module is also used to output a temperature control instruction and a waste liquid discharge instruction;

[0081] The liquid preparation task instruction is generated according to the predetermined oil / water ratio of the sample liquid, and is used to prepare the sample liquid with the specified oil / water ratio;

[0082] The circulation measurement instruction is generated according to the sample solution preparation completion instruction and is used to control the sample solution to enter the circulation module;

[0083] The temperature control instruction is generated according to the measurement result of the water content of the sample liquid, and is used to adjust the temperature of the sample liquid when the measurement result of the water content of the sample liquid does not match the prepared water content of the sample liquid;

[0084] The waste liquid discharge instruction is generated according to the measurement result of the water content of the sample liquid, and is used to control the sample liquid to be discharged into the waste liquid pool when the measurement result of the water content of the sample liquid no longer changes with the change of temperature.

[0085] As mentioned above, when the measurement execution system receives the measurement execution instruction, the automatic liquid preparation module receives the liquid preparation task instruction, and the liquid preparation task instruction includes a preset oil / water ratio of the sample liquid, such as a sample liquid with a water content of 20%. After the sample liquid is prepared, it is input into the circulation module, and the circulation module receives the circulation measurement instruction. The purpose is that when the sample liquid is input into the circulation module, due to its physical properties, the oil and water in the sample liquid are not completely stratified. The main reason is the temperature. Multiple cycles can adjust the temperature of the sample liquid so that the oil and water in the sample liquid are completely stratified, thereby making the measurement result of the water content meter more accurate, that is, the automatic temperature control module is controlled by the temperature control instruction to adjust the temperature of the sample liquid. When the water content measurement result of the sample liquid is inconsistent with the prepared water content of the sample liquid, the central control module outputs the temperature control instruction, the automatic temperature control module receives the temperature control instruction and performs temperature adjustment. When the water content measurement of the sample liquid no longer changes with the temperature adjustment, the central control module outputs the waste liquid discharge instruction to control the sample liquid to be discharged into the waste liquid pool.

[0086] In one embodiment, the method for the automatic liquid dispensing module to automatically and accurately dispense liquid is:

[0087] Receive liquid preparation task instructions and prepare liquid according to the liquid preparation task instructions, including setting up independent square oil tanks and square water tanks;

[0088] Automatic injection metering device is used to accurately extract oil and water from the square oil tank and square water tank respectively;

[0089] The oil and water are transmitted separately through independent pipelines and collected before injection to complete the liquid preparation and output the sample liquid preparation completion instruction;

[0090] Among them, the output ports of the square oil tank and the square water tank are connected to independent pipelines, and the two independent pipelines are connected to the liquid distribution pipeline; the automatic injection metering device is arranged in the independent pipeline, and the oil and water are collected in the liquid distribution pipeline.

[0091] As an embodiment of the present invention, the automatic liquid dispensing module uses independent square oil tanks and square water tanks to store oil and water respectively. When the automatic liquid dispensing module receives a liquid dispensing task instruction, the sample liquid is prepared according to the oil / water ratio and the sample liquid volume carried in the liquid dispensing task instruction. When the sample liquid is prepared, the automatic liquid dispensing module outputs a liquid dispensing completion instruction, which is received by the circulation module, and receives the prepared sample liquid. Before the sample liquid is injected into the circulation module, the independently configured oil and water are respectively transmitted through independent pipelines and finally collected in the liquid dispensing pipeline. The liquid dispensing pipeline is connected to the circulation module, that is, the configured oil and water are mixed before entering the circulation module to form a sample liquid with a set oil / water ratio.

[0092] In addition, the extraction of oil and water depends on an automatic injection metering device, which consists of a stepper motor, an electric cylinder (ball screw drive), and a piston cylinder. The piston device is precisely controlled by controlling the stroke of the stepper motor (with an accuracy of up to ±0.01mm) to quantitatively inject liquid and trace the value.

[0093] In one embodiment, the circulation module is also used to receive a sample liquid preparation completion instruction and receive the prepared sample liquid, and the circulation module includes a sample liquid injection port, an exhaust port, a sample liquid circulation pipeline, and an online density meter, a pressure transmitter, a temperature transmitter, a flow meter, a water content meter and a pump arranged on the sample liquid circulation pipeline;

[0094] The sample liquid is connected to the sample liquid injection port through the liquid preparation pipeline after the liquid preparation;

[0095] The automatic temperature control module comprises a low temperature constant temperature device and a temperature control pipeline, wherein the temperature control pipeline is connected to the low temperature constant temperature device; the temperature control pipeline is arranged at any section of the sample liquid circulation pipeline.

[0096] The method for the circulation module to decide on the sample liquid input is to receive the sample liquid preparation completion instruction, and then allow the prepared sample liquid to be input into the circulation module, otherwise it will cause a large error in the water content measurement. The circulation module is provided with a sample liquid injection port, an exhaust port, a sample liquid circulation pipeline, and multiple instruments such as an online density meter, a pressure transmitter, a temperature transmitter, a flow meter, a water content meter and a pump arranged on the sample liquid circulation pipeline, which are used to measure the density, pressure, temperature, flow and water content data of the sample liquid. In addition, the sample liquid injection port is connected to the liquid distribution pipeline, that is, after the prepared oil and water are mixed, they are directly input into the sample liquid circulation pipeline through the liquid distribution pipeline and the sample liquid injection port, and the exhaust port is mainly used for automatic exhaust and purging to eliminate impurities that may exist in the sample liquid circulation pipeline;

[0097] In addition, the temperature control pipeline in the automatic temperature control module is set at any section of the sample liquid circulation pipeline, which is used to control the temperature of any section of the sample liquid circulation pipeline to achieve temperature control of the sample liquid, and can achieve a temperature control accuracy of ±1°C and a temperature control range of 10°C~60°C.

[0098] In one embodiment, the method in which the central control module controls the sample liquid circulation to measure the water content is:

[0099] Obtain the prepared water content of the sample solution, that is, the oil / water ratio of the sample solution;

[0100] When the measured water content of the sample solution does not match the prepared water content of the sample solution, the central control module outputs a cyclic measurement instruction;

[0101] The method for measuring the water content of the sample liquid by the circulation module is:

[0102] Receive the cyclic measurement instruction, control the sample liquid to circulate in the sample liquid circulation pipeline, and repeat the measurement;

[0103] The water content of the sample liquid is measured cyclically until the measured water content of the sample liquid no longer changes with the temperature change, thus completing the measurement of the water content of the sample liquid;

[0104] Output the sample liquid that has completed the measurement to the waste liquid pool. As an embodiment of the present invention, the circulation time of the sample liquid in the circulation module is determined by the measurement result of the water content of the sample liquid, specifically, by obtaining the prepared water content of the sample liquid and the measured water content of the sample liquid, when the measured water content of the sample liquid obtained by any water content meter does not match the prepared water content of the sample liquid, the central control module outputs a circulation measurement instruction. It is worth noting that a water content meter is provided at the sample liquid injection port of the sample liquid circulation pipeline. The measured water content of the sample liquid obtained by this water content meter must not match the prepared water content. Therefore, the central control module outputs a circulation measurement instruction to make the sample liquid circulate in the sample liquid circulation pipeline and measure the water content through multiple water content meters. After a certain time, the measured water content of the sample liquid obtained by all water content meters does not change with the temperature change, which means that the water content measurement of the sample liquid is completed, and the central control module outputs a waste liquid discharge instruction. The circulation module receives the waste liquid discharge instruction and controls the sample liquid to be output to the waste liquid pool;

[0105] Among them, when the measured water content of the sample liquid obtained by multiple water content meters at a certain time point no longer changes with the temperature change, that is, maintains a constant value, and after this time point, the measured water content of the sample liquid obtained by any water content meter does not match the constant measured water content, it may be that the water content meter is faulty;

[0106] For example, assuming that there are moisture meters A, B, C, and D on the sample liquid circulation pipeline; and the circulation route of the sample liquid is from moisture meter A to moisture meter B, and moisture meter C to moisture meter D. At any moment, the measured moisture content obtained by moisture meter A no longer changes with temperature, the errors between the measured moisture contents obtained by moisture meters B and C and the measured moisture content obtained by moisture meter A are less than the limit, while the error between the measured moisture content obtained by moisture meter D and the measured moisture content obtained by moisture meter A is greater than the limit, then the moisture meter D may be faulty, where the limit is the moisture content error coefficient allowed in trade.

[0107] In one embodiment, the method in which the central control module controls the automatic temperature control module to adjust the temperature is:

[0108] Acquire the status data of the sample liquid based on the data intelligent acquisition and processing module;

[0109] When the measured water content of the sample liquid is lower than the configured water content, the central control module outputs a temperature control instruction;

[0110] When the measured water content of the sample liquid no longer changes with the temperature, the central control module outputs a command to maintain a constant temperature;

[0111] The automatic temperature control module is used to receive temperature control instructions and adjust the temperature based on a low-temperature constant temperature device; the automatic temperature control module is also used to receive instructions for maintaining a constant temperature and, when the measured water content of the sample liquid no longer changes with temperature, maintain the temperature of the sample liquid based on the low-temperature constant temperature device.

[0112] In one embodiment of the present invention, the status data of the sample liquid obtained in the measurement execution system can be collected by the data intelligent acquisition and processing module, that is, in the cyclic measurement process of the water content of the sample liquid, the data intelligent acquisition and processing module can obtain the measured water content of the sample liquid in real time. When the measured water content of the sample liquid does not match the prepared water content, the central control module outputs a temperature control instruction to control the automatic temperature control module to adjust the temperature of the sample liquid. Conversely, when the measured water content no longer changes with the temperature, the central control module outputs a constant temperature maintenance instruction to promote the full separation of oil and water in the sample liquid.

[0113] In one embodiment, the method by which the data intelligent acquisition and processing module acquires the state data of the sample liquid is:

[0114] After the sample liquid is input into the sample liquid circulation pipeline through the sample liquid injection port, the status data of the sample liquid, including density, pressure, temperature, flow rate and water content, are collected through the online density meter, pressure transmitter, temperature transmitter, flow meter and water content meter;

[0115] The online density meter, pressure transmitter, temperature transmitter, flow meter, and water content meter communicate with the data intelligent acquisition and processing module.

[0116] As mentioned above, the intelligent data acquisition module can collect the status data of the sample liquid in real time, including the density, pressure, temperature, flow rate and water content of the sample liquid.

[0117] In one embodiment, the intelligent control system further includes a data storage module, and the data storage module is used to store raw data when the measurement execution system is running, and the raw data includes the measured water content, pressure, temperature, flow rate, and density of the sample liquid.

[0118] In one embodiment, the intelligent control system further includes an early warning module, which is used to output an alarm signal: when the measured value of the pressure transmitter exceeds a threshold, the data intelligent acquisition and processing module communicates with the early warning module, causing the early warning module to output an alarm signal.

[0119] As an embodiment of the present invention, since the sample liquid circulation pipeline is in a closed state during the process of circulating the sample liquid to measure the water content, a pressure transmitter is provided to monitor the pressure of the sample liquid circulation pipeline. When the pressure value monitored by the pressure transmitter exceeds the threshold, it may cause damage to the tester or related equipment. For example, excessive pressure may overload the sensor of the instrument, causing it to fail or reduce its accuracy. In addition, abnormal changes in pressure may affect the measurement results of the water content; if the pressure is unstable or fluctuates greatly, the tester may not be able to accurately measure the water content in the sample liquid; therefore, when the pressure monitoring value exceeds the threshold, the early warning module outputs an alarm signal to prompt the staff.

[0120] Working principle: Since the existing petroleum water content tester calibration device has problems such as small measurement range, low degree of automation in the calibration process, and manual recording of test data, as an embodiment of the present invention, when calibrating the petroleum water content tester, the intelligent control system outputs a measurement execution instruction to control the measurement execution system to prepare sample liquids of multiple calibration points into the circulation module, thereby measuring the petroleum water content. Among them, the automatic liquid preparation module is used in the measurement execution system to prepare sample liquids of different calibration points. Compared with manual sample liquid preparation, the sample liquid preparation time is shortened and the intermediate preparation is avoided. The link causes an error in the oil / water ratio of the sample liquid, and at the same time, it can be traced, which improves the efficiency of measuring the water content of the sample liquid. When the sample liquid with a specified oil / water ratio is input into the circulation module, the central control module decides that the sample liquid circulates in the circulation module to measure the water content, and controls the automatic temperature control module to adjust the temperature of the sample liquid by measuring and feeding back the sample liquid temperature, so that after the sample liquid circulates in the circulation module for many times, the oil and water are fully separated, so that the water content meter can measure the water content of the sample liquid more accurately and with smaller errors. In addition, in this process, the state data of the sample liquid can be collected by the data intelligent collection and processing module;

[0121] Specifically, during the calibration phase, a sample liquid with a fixed oil / water ratio is prepared and input into the circulation module. When the sample liquid is injected into the circulation module, a moisture meter is used to measure the moisture content of the sample liquid. Due to the influence of factors such as temperature, there may be a large error between the measured moisture content of the sample liquid and the prepared moisture content. When the error is too large, the automatic temperature control module intervenes and adjusts the temperature of the sample liquid. At the same time, the central control module controls the sample liquid to circulate in the circulation module. The sample liquid is measured by the online density meter, pressure transmitter, temperature transmitter, flow meter, and moisture meter in turn to measure the status data until the measured moisture content measured by the moisture meter no longer changes with temperature. The data on the change of the measured moisture content of the sample liquid with temperature is recorded, and then the sample liquid is controlled to be discharged into the waste liquid pool to complete the measurement of the moisture content of the sample liquid with a fixed oil / water ratio.

[0122] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An online monitoring and calibration system for petroleum water content, characterized in that: For calibration of measurement execution systems, including: An automatic liquid preparation module, used to prepare sample liquids for multiple calibration points and inject the sample liquids into the circulation module; A circulation module, used for inputting a sample liquid and obtaining a measured water content of the sample liquid; Automatic temperature control module, used to adjust the sample liquid temperature; An intelligent control system outputs a measurement execution instruction to control the measurement execution system, and the intelligent control system includes: A central control module is used to control the measurement execution system to execute the measurement task; The data intelligent collection and processing module is used to collect the status data of the sample liquid, including the measured water content of the sample liquid, and generate a temperature-based water content comparison table according to the measured water content and the prepared water content of the sample liquid; the prepared water content is obtained during the sample liquid preparation stage; The intelligent control system controls the measurement execution system to measure the water content of the sample liquid at multiple calibration points, and obtains the measured water content of the sample liquid to calibrate the measurement execution system's measurement result of the water content of the sample liquid; Also included is a display module, the display module is used to display the calculated water content of the sample liquid; The method in which the central control module controls the measurement execution system to perform the measurement task is: receiving a calibration instruction; Automatically generate measurement execution instructions based on calibration instructions; The method for the measurement execution system to perform the measurement task is: receiving a measurement execution instruction; the measurement execution instruction carries the oil / water ratio of the sample liquid; According to the oil / water ratio of the sample liquid in the measurement execution instruction, the sample liquid preparation and injection are completed; The sample liquid with the specified oil / water ratio enters the circulation module, and the temperature is controlled by the automatic temperature control module to complete the full separation of oil and water; Then the water content of the sample liquid is tested by a water content meter; The measurement execution instructions include liquid preparation task instructions and cycle measurement instructions; the central control module is also used to output temperature control instructions and waste liquid discharge instructions; The liquid preparation task instruction is generated according to the predetermined oil / water ratio of the sample liquid, and is used to prepare the sample liquid with the specified oil / water ratio; The circulation measurement instruction is generated according to the sample solution preparation completion instruction and is used to control the sample solution to enter the circulation module; The temperature control instruction is generated according to the measurement result of the water content of the sample liquid, and is used to adjust the temperature of the sample liquid when the measurement result of the water content of the sample liquid does not match the prepared water content of the sample liquid; The waste liquid discharge instruction is generated according to the measurement result of the water content of the sample liquid, and is used to control the sample liquid to be discharged into the waste liquid pool when the measurement result of the water content of the sample liquid is consistent with the prepared water content of the sample liquid; The method for automatically and accurately dispensing liquid by the automatic liquid dispensing module is: Receive liquid preparation task instructions and prepare liquid according to the liquid preparation task instructions, including setting up independent square oil tanks and square water tanks; Automatic injection metering device is used to accurately extract oil and water from the square oil tank and square water tank respectively; The oil and water are transmitted separately through independent pipelines and collected before injection to complete the liquid preparation and output the sample liquid preparation completion instruction; The output ports of the square oil tank and the square water tank are both connected to independent pipelines, and the two independent pipelines are connected to the liquid distribution pipeline; the automatic injection metering device is arranged in the independent pipeline, and the oil and water are collected in the liquid distribution pipeline; The circulation module is also used to receive a sample liquid preparation completion instruction and receive the prepared sample liquid. The circulation module includes a sample liquid injection port, an exhaust port, a sample liquid circulation pipeline, and an online density meter, a pressure transmitter, a temperature transmitter, a flow meter, a water content meter and a pump arranged on the sample liquid circulation pipeline; The sample liquid is connected to the sample liquid injection port through the liquid preparation pipeline after the liquid preparation; The automatic temperature control module comprises a low temperature constant temperature device and a temperature control pipeline, wherein the temperature control pipeline is connected to the low temperature constant temperature device; the temperature control pipeline is arranged at any section of the sample liquid circulation pipeline.

2. The on-line monitoring and calibration system for water content in petroleum according to claim 1 is characterized in that: The method for the central control module to control the sample liquid circulation to measure the water content is: Obtain the prepared water content of the sample solution, that is, the oil / water ratio of the sample solution; When the measured water content of the sample liquid does not match the prepared water content of the sample liquid, the central control module outputs a cyclic measurement instruction; The method for measuring the water content of the sample liquid by the circulation module is: Receive the cyclic measurement instruction, control the sample liquid to circulate in the sample liquid circulation pipeline, and repeat the measurement; The water content of the sample liquid is measured cyclically until the measured water content of the sample liquid is consistent with the prepared water content of the sample liquid, thereby completing the measurement of the water content of the sample liquid; The sample liquid after measurement is output to the waste liquid tank.

3. The on-line monitoring and calibration system for water content in petroleum according to claim 2 is characterized in that: The method in which the central control module controls the automatic temperature control module to adjust the temperature is: Acquire the status data of the sample liquid based on the data intelligent acquisition and processing module; When the measured water content of the sample liquid is lower than the configured water content, the central control module outputs a temperature control instruction; When the measured water content of the sample liquid no longer changes with the temperature, the central control module outputs a command to maintain a constant temperature; The automatic temperature control module is used to receive temperature control instructions and adjust the temperature based on a low-temperature constant temperature device; the automatic temperature control module is also used to receive instructions for maintaining a constant temperature and, when the measured water content of the sample liquid no longer changes with temperature, maintain the temperature of the sample liquid based on the low-temperature constant temperature device.

4. The on-line monitoring and calibration system for water content in petroleum according to claim 3 is characterized in that: The method for the data intelligent acquisition and processing module to acquire the state data of the sample liquid is: After the sample liquid is input into the sample liquid circulation pipeline through the sample liquid injection port, the status data of the sample liquid, including density, pressure, temperature, flow rate and water content, are collected through the online density meter, pressure transmitter, temperature transmitter, flow meter and water content meter; The online density meter, pressure transmitter, temperature transmitter, flow meter, and water content meter communicate with the data intelligent acquisition and processing module.

5. The on-line monitoring and calibration system for water content in petroleum according to claim 4 is characterized in that: The intelligent control system also includes a data storage module, which is used to store raw data when the measurement execution system is running, and the raw data includes the measured water content, pressure, temperature, flow rate, and density of the sample liquid.

6. The on-line monitoring and calibration system for water content in petroleum according to claim 5 is characterized in that: The intelligent control system also includes an early warning module, which is used to output an alarm signal: when the measured value of the pressure transmitter exceeds a threshold, the data intelligent acquisition and processing module communicates with the early warning module, causing the early warning module to output an alarm signal.

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