Fully automatic high-precision gas-containing oil sample preparation method and device

Abstract

The present invention belongs to the technical field of power equipment status monitoring, and specifically discloses a fully automatic high-precision gas-containing oil sample preparation method and device. When the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil, and a correction coefficient is determined based on the solubility coefficient corresponding to the oil sample type determined by the temperature sensor, pressure sensor, and density sensor. The required volume of each component standard gas is calculated and determined based on the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration, and the correction coefficient; after the standard gas of each component is transferred to the oil cylinder according to the volume, the oil circulation pipeline is opened to fully dissolve the standard gas; when the oil sample concentration obtained by the gas concentration detection in the oil reaches the required oil sample concentration, the oil is discharged through the oil outlet when the pressure in the oil cylinder is maintained within the preset pressure range. This solution solves the technical problems of low automation and low precision in the automatic configuration of gas-containing oil samples.

Description

Technical Field

[0001] The invention belongs to the technical field of power equipment status monitoring, and in particular relates to a fully automatic high-precision gas-containing oil sample preparation method and device. Background Art

[0002] Online monitoring of the operating status of power equipment and ensuring the safe operation of power equipment are key measures to improve the operational reliability of the entire power system. With the increasing requirements for the intelligence of power grids, online monitoring of insulating oil of equipment such as transformers and reactors has become an indispensable part of intelligent substations. The online monitoring device for dissolved gas in oil analyzes the components and content of dissolved gas in transformer oil through dissolved gas analysis technology in oil, and can timely detect latent faults inside the transformer. However, with the promotion and application of oil chromatography online monitoring devices, it is inevitable that the data of online monitoring devices will be abnormal and inaccurate, and they cannot normally reflect the working conditions of the operating transformers. This is undoubtedly a major problem for the power grid. Therefore, it is of great significance to strengthen the quality control of online monitoring devices for dissolved gas in oil, including strengthening laboratory type tests and regularly calibrating the accuracy of on-site equipment in operation.

[0003] During the performance testing and regular calibration of the online monitoring device for dissolved gas in oil, it is necessary to prepare gas-containing oil samples of different concentrations. The traditional method of manually preparing gas-containing oil samples has the disadvantages of cumbersome steps, low accuracy and difficulty in controlling the sensitive gas in the prepared oil samples, resulting in low efficiency. At the same time, with the continuous improvement of inspection standards, the requirements for the prepared oil samples are also gradually increasing. For devices that automatically configure gas-containing oil samples, many companies have conducted relevant research and development, but there are still problems of low configuration accuracy and low degree of automation. Summary of the invention

[0004] The purpose of the present invention is to provide a fully automatic high-precision gas-containing oil sample preparation method and device to solve the technical problems of low automation and low precision in automatic preparation of gas-containing oil samples.

[0005] To achieve the above object, the present invention adopts the following technical solution:

[0006] A fully automatic high-precision gas-containing oil sample preparation method comprises: vacuuming an oil cylinder to allow oil in the well to enter the oil cylinder until the amount of oil entering reaches the required amount of oil; Air is passed through the oil cylinder to elute the gas concentration of each component in the oil, and when the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to degas the oil circulation; when the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil, and a correction coefficient is determined based on the solubility coefficient corresponding to the oil sample type determined by the temperature sensor, the pressure sensor, and the density sensor. The required volume of the standard gas of each component is calculated and determined based on the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration, and the correction coefficient; after the standard gas of each component is transferred to the oil cylinder according to the volume, the oil circulation pipeline is opened to fully dissolve the standard gas, and the gas concentration in the oil is detected; when the oil sample concentration obtained by the real-time detection of the gas concentration in the oil does not reach the required oil sample concentration, the oil distribution is adjusted based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration; when the oil sample concentration obtained by the gas concentration detection in the oil reaches the required oil sample concentration, the oil is discharged through the oil outlet when the pressure in the oil cylinder is maintained within the preset pressure range.

[0007] A fully automatic high-precision gas-containing oil sample preparation device comprises: a preparation instrument, a detection instrument and a meter; the preparation instrument is connected to the meter via an air pipe, and the preparation instrument is connected to the detection instrument via an oil pipe; the preparation instrument comprises an oil cylinder and a well, and the oil in the well enters the oil cylinder by evacuating the oil cylinder until the oil intake reaches the required amount; air is passed through the oil cylinder to elute the gas concentration of each component in the oil, and when the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to circulate and degas the oil; the detection instrument is used to detect the gas concentration in the oil; the meter is used to determine the correction coefficient based on the solubility coefficient corresponding to the oil sample type determined by the temperature sensor, the pressure sensor, and the density sensor, and the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, and the required oil sample concentration are determined. The required volume of each component standard gas is determined by calculating the degree and correction coefficient; the above-mentioned preparation instrument is also used to open the oil circulation pipeline to fully dissolve the standard gas after transferring the standard gas of each component to the oil cylinder according to the volume; when the oil sample concentration obtained by the real-time detection of the gas concentration in the oil does not reach the required oil sample concentration, the oil preparation is adjusted based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration; when the oil sample concentration obtained by the gas concentration detection in the oil reaches the required oil sample concentration, the oil is discharged by using the oil outlet valve when the pressure in the oil cylinder is maintained in the preset pressure range.

[0008] A computer-readable storage medium stores a computer program, wherein the computer program is configured to execute the above-mentioned fully automatic high-precision gas-containing oil sample preparation method when running.

[0009] An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the fully automatic high-precision gas-containing oil sample preparation method through the computer program.

[0010] In the present invention, fully automatic control is achieved through a series of processes including oil intake, oil removal concentration, degassing, gas distribution, and oil distribution. By adding a degassing process and proportioning the standard gas, the preparation of oil samples of any concentration is achieved. The correction coefficient is automatically adjusted by parameters such as temperature and pressure and used to calculate the required standard gas volume, so that the concentration of the configured gas is controlled with high precision to improve the oil distribution accuracy. At the same time, based on the real-time detected oil sample concentration, it is determined whether the required oil sample concentration has been reached. If the required oil sample concentration has not been reached, automatic adjustment is performed until the required oil sample concentration is reached, thereby achieving fully automated and high-precision preparation of gas-containing oil samples, solving the technical problems of low automation and low precision in automatic configuration of gas-containing oil samples, and achieving the technical effect of improving the automation and precision of the preparation of gas-containing oil samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic flow chart of a fully automatic high-precision gas-containing oil sample preparation method in an embodiment of the present invention;

[0012] Figure 2 It is a schematic flow chart of a fully automatic high-precision gas-containing oil sample preparation method in an embodiment of the present invention;

[0013] Figure 3 It is a communication control schematic diagram of a fully automatic high-precision gas-containing oil sample preparation method in an embodiment of the present invention;

[0014] Figure 4 It is a structural schematic diagram of a fully automatic high-precision gas-containing oil sample preparation device in an embodiment of the present invention. DETAILED DESCRIPTION

[0015] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description and claims. It should be noted that the drawings are all in very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0016] It should be noted that, in order to clearly explain the content of the present invention, the present invention specifically cites multiple embodiments to further illustrate different implementations of the present invention, wherein the multiple embodiments are enumerated rather than exhaustive. In addition, for the sake of brevity of explanation, the contents mentioned in the previous embodiments are often omitted in the subsequent embodiments. Therefore, the contents not mentioned in the subsequent embodiments can refer to the previous embodiments accordingly.

[0017] Example 1

[0018] A fully automatic high-precision gas oil sample preparation method, such as Figure 1 As shown, the method includes:

[0019] S102, vacuuming the oil cylinder to allow the oil in the well to enter the oil cylinder until the oil intake reaches the required amount;

[0020] S104, passing air through the oil cylinder to elute the gas concentration of each component in the oil, and when the oil cylinder reaches a preset negative pressure, opening the valve and oil pump of the oil circulation pipeline to circulate and degas the oil;

[0021] S106, when the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil, and a correction coefficient is determined based on the solubility coefficient corresponding to the oil sample type detected by the temperature sensor, the pressure sensor, and the density sensor, and the required volume of each component of the standard gas is calculated and determined based on the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration, and the correction coefficient;

[0022] S108, after transferring each component of the standard gas to the oil cylinder according to the volume, opening the oil circulation pipeline to fully dissolve the standard gas, and performing gas concentration detection in the oil;

[0023] S110, when the oil sample concentration obtained by the real-time detection of the gas concentration in the oil does not reach the required oil sample concentration, the oil distribution is adjusted based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration; when the oil sample concentration obtained by the real-time detection of the gas concentration in the oil reaches the required oil sample concentration, the oil is discharged through the oil outlet while the pressure in the oil cylinder is maintained within a preset pressure range.

[0024] Optionally, the oil cylinder is not limited to being provided with a piston, the piston divides the inner cavity of the oil cylinder into an upper cavity and a lower cavity, the upper cavity is used for oil, and the lower cavity is used for ventilation. The gas in the lower cavity and the gas in the oil sample are not limited to being controlled through the gas circuit, and the oil in and out are not limited to being controlled through the oil circuit.

[0025] As an optional implementation, the oil cylinder is evacuated to allow the oil in the well to enter the oil cylinder until the oil intake reaches the required amount, including: evacuating the lower chamber of the oil cylinder and then back-blowing the well pipeline to allow all the oil in the well to enter the oil cylinder, wherein the lower chamber of the oil cylinder is a non-oil intake chamber; pressurizing the lower chamber of the oil cylinder to discharge the upper gas of the upper chamber of the oil cylinder, wherein the upper chamber of the oil cylinder is an oil intake chamber; calculating the oil intake amount according to the position of the piston in the oil cylinder, and making the oil intake reach the required amount based on the oil intake valve and the waste oil valve, wherein the piston isolates the interior of the oil cylinder into an upper chamber and a lower chamber.

[0026] As an optional implementation, the oil intake amount is calculated according to the piston position in the oil cylinder, and the oil intake amount is made to reach the required oil amount based on the oil inlet valve and the waste oil valve, including: calculating the volume of the oil in the oil cylinder according to the piston position; when the volume is greater than the required oil amount, pressurizing the lower chamber of the oil cylinder and opening the waste oil valve to discharge excess oil; when the volume is less than the required oil amount, opening the oil inlet valve and the oil pump, and closing the oil inlet valve and the oil pump after the required oil amount is reached.

[0027] Optionally, the oil cylinder is evacuated to allow the oil in the well to enter the oil cylinder, including: during the oil entry process, detecting the density of the oil sample by a density sensor.

[0028] As an optional implementation, air is passed through the oil cylinder to elute the gas concentration of each component in the oil, including: evacuating the lower chamber of the oil cylinder while passing air through the upper chamber of the oil cylinder, and when the piston moves to the lowest position, continuously evacuating the lower chamber of the oil cylinder; evacuating the upper chamber of the oil cylinder, and eluting the gas concentration of each sensitive component in the oil based on the air passed through the bottom; and performing nitrogen elution after a preset time.

[0029] As an optional implementation, when the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to perform oil circulation degassing, including: opening the oil cylinder's air extraction valve and air pump to vacuum the upper chamber of the oil cylinder, closing the air extraction valve and air pump when the upper chamber of the oil cylinder is evacuated to a preset negative pressure, and opening the valve and oil pump of the oil circulation pipeline to perform oil circulation degassing, and continuing to vacuum the upper chamber of the oil cylinder when the pressure in the upper chamber of the oil cylinder rises to a preset value, and repeating the cycle until the gas content in the oil is fully removed.

[0030] As an optional implementation, when the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil, including: when the lower chamber of the oil cylinder is pressurized to maintain the pressure within the preset pressure range, a syringe is connected to the oil extraction port, and the gas concentration in the oil is automatically sampled through a communication-connected chromatograph to detect the gas concentration in the oil.

[0031] As an optional implementation, a correction coefficient is determined based on a temperature sensor, a pressure sensor, a density sensor and the inherent solubility coefficient of the gas, including: determining a temperature correction coefficient based on the actual temperature measured by the temperature sensor; determining a pressure correction coefficient based on the actual pressure measured by the pressure sensor; determining an oil sample type based on the density of the oil sample detected by the density sensor, and determining a solubility coefficient based on the oil sample type; determining a correction coefficient based on the temperature correction coefficient, the pressure correction coefficient, the solubility coefficient and the system coefficient.

[0032] Specifically, the type of the oil sample is determined according to the density of the oil sample detected by the density sensor, and then the corresponding gas intrinsic solubility coefficient is determined according to the type of the oil sample to determine the corresponding solubility coefficient.

[0033] The density of the oil sample is detected by the density sensor to determine the type of the oil sample. The oil sample type is not limited to different types of mineral oil, new environmentally friendly natural ester transformer oil, etc. According to different oil sample types, the built-in corresponding solubility coefficient is called up.

[0034] As an optional implementation, after calculating and determining the required volume of each component standard gas, it also includes: transmitting the volume value of each component standard gas to a meter through communication, and the meter determines the working distance of each component gas motor through calculation to inject each component standard gas into the cylinder according to the volume.

[0035] As an optional implementation, each component standard gas is injected into the oil cylinder according to the volume, including: opening the N2 valve to flush the pipeline, then vacuuming all the pipelines of the meter and exhausting the gas; opening a required sensitive component gas valve to inject the standard gas into the cylinder, and running the cylinder to a preset position for metering, running the cylinder to zero position after metering, and at the same time fully transferring the current standard gas, and flushing and exhausting the pipeline with N2 again; adding other sensitive component standard gases according to the above steps until all the required sensitive component gases are transferred to the cylinder; injecting the standard gases of each component of the cylinder into the oil cylinder through the air pipe.

[0036] Specifically, when the oil sample concentration obtained by the real-time detection of the gas concentration in the oil does not reach the required oil sample concentration, the oil distribution is adjusted based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration, including but not limited to the following situations:

[0037] The gas concentration in the prepared oil sample is detected by a chromatograph and the result is sent to the controller CPU. When the oil sample detection result is within the reasonable range of the required oil sample concentration (for example, within 10%), it is determined that the required oil sample concentration has been reached and oil can be produced without adjustment.

[0038] When all or part of the gas concentration is higher than the reasonable range of the required set value, the oil valve and oil pump are controlled through calculation to fill in the corresponding amount of pure blank oil, and the original oil sample is fully mixed with the newly injected blank oil sample to achieve gas balance and then test again.

[0039] When all or part of the gas concentration is lower than the required set value range, the corresponding standard gas is injected into the oil through calculation and controlled, and sufficient dissolution equilibrium is carried out and tested again.

[0040] When the concentration of some gases is higher than the set value and the concentration of some gases is lower than the set value, a comprehensive calculation is performed, first the above-mentioned oil injection is performed, then the above-mentioned spiked gas is added, and then the test is performed again.

[0041] Adjust the oil sample according to the above conditions until the required oil concentration is reached.

[0042] Specifically, the implementation process of the above-mentioned fully automatic high-precision gas-containing oil sample preparation method is not limited to the following: Figure 2 As shown, the following steps are included:

[0043] S1, quantitative oil intake.

[0044] It is not limited to first vacuuming the lower chamber of the oil cylinder and then back-blowing the well pipeline to allow all the oil in the well to enter the oil cylinder. Then pressurize the lower chamber of the oil cylinder to discharge the gas in the upper chamber of the oil cylinder. When the liquid level sensor connected to the well senses the preset liquid level, it stops. At this time, there are no bubbles in the upper chamber of the oil cylinder. Calculate the volume of oil in the oil cylinder according to the piston position. When the calculated volume of oil in the cylinder is greater than the required oil volume, pressurize the lower chamber of the oil cylinder and open the waste oil valve to discharge the excess oil; when the calculated volume of oil in the cylinder is less than the required oil volume, open the oil inlet valve and the oil pump to inlet oil. When the oil inlet reaches the required oil volume, close the oil inlet valve and the oil pump to complete the oil inlet. Record the oil volume in the oil cylinder as a basis for calculating the standard gas volume.

[0045] Furthermore, during the oil intake process, it is not limited to detecting the density of the oil sample by a density sensor, judging the type of the oil sample by the density, and automatically switching the solubility coefficient according to the type of the oil sample.

[0046] S2, (gas) concentration in deoiling.

[0047] The lower chamber of the oil cylinder is evacuated, and the upper chamber of the oil cylinder is allowed to pass air. When the piston moves to the lowest position, the lower chamber of the oil cylinder is continuously evacuated.

[0048] The upper chamber of the oil cylinder is evacuated, and air is passed through the bottom of the cylinder to elute the gas concentration of each component in the oil. After a period of time, N2 elution is performed, that is, high-purity N2 is passed through for cyclic degassing.

[0049] S3, gas content (in oil).

[0050] Open the vacuum valve and air pump connected to the oil cylinder to vacuum the upper chamber of the oil cylinder. When the preset negative pressure is reached, close the vacuum valve and air pump, open the valve and oil pump of the oil circulation pipeline to degas the oil circulation. During the degassing process, the cylinder pressure will gradually rise. When the pressure rises to the preset value, continue to vacuum the upper chamber of the oil cylinder, and repeat this process until the gas content in the oil is fully removed.

[0051] S4, gas distribution.

[0052] After pressurizing the lower chamber of the oil cylinder to keep the pressure in the chamber at the preset value, connect the syringe to the oil extraction port, and automatically take samples through the communication-connected chromatograph to detect the gas concentration in the oil, or open the ball valve next to the oil extraction port to take oil for gas concentration detection.

[0053] The temperature, pressure and density in the oil cylinder are detected by temperature sensors, pressure sensors and density sensors to determine the correction coefficient. The required volume of standard gas for each component is calculated based on the oil sample concentration measured by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration and the correction coefficient.

[0054] The volume value of each component of the standard gas is transmitted to the gas meter through communication, and the gas meter obtains the required travel distance of the gas motor of each component by calculation.

[0055] The gas meter opens the N2 valve to flush the pipeline, then evacuates all pipelines of the gas meter and exhausts the gas. Open the required sensitive component gas valve to inject the standard gas into the cylinder, then run the cylinder to the specified position for metering. After the metering is completed, run the cylinder to zero position, and at the same time fully transfer the current standard gas, then flush the pipeline with N2 and exhaust the gas.

[0056] Repeat the above steps to meter and add other sensitive component standard gases until all the required sensitive component gases are metered and transferred, and the gas distribution process is completed.

[0057] S5, oil distribution.

[0058] When all the standard gas is transferred to the oil cylinder, open the oil circulation pipeline to fully dissolve the standard gas. The gas concentration in the prepared oil sample is tested by the communication control chromatograph, and the test value is read and displayed on the human-machine interface. Communication control is not limited to Figure 3 The human-machine interface interacts through the CPU, which reads and controls the chromatograph, and can also read the values ​​of various sensors to control the oil valve, gas valve, oil pump, and gas pump.

[0059] S6, with oil pressure

[0060] The lower chamber of the oil cylinder is pressurized to keep the pressure in the chamber at a preset value, and then the corresponding oil outlet is used to discharge the oil under pressure. The specific oil outlet is not limited to corresponding to different needs, including but not limited to oil: chromatograph, oil storage device and other uses.

[0061] Furthermore, part of the oil sample is taken out through the oil extraction port to measure the oil sample concentration, and the required volume of each component of the standard gas is calculated according to the remaining oil sample volume in the cylinder, the standard gas concentration and the required oil sample concentration, and the calculation result is transmitted to the gas meter.

[0062] Under ideal conditions, if the added standard gas of known concentration is completely dissolved in the oil sample of known volume and concentration, the volume of each component of standard gas to be added is not limited to the calculation according to formula (1):

[0063] (1)

[0064] Where:

[0065] X i —20℃, 101.325kPa dissolved gas component concentration in the standard sample oil, μL / L;

[0066] C ig —Concentration of component i in the standard gas, μL / L;

[0067] C io —Oil sample concentration before preparation, μL / L;

[0068] V L —Actual oil sample volume when prepared at a constant 50°C, mL.

[0069] However, in the actual preparation process, due to the existence of a series of factors such as temperature and pressure that affect the solubility of each component gas, it is proposed to add correction coefficients K1, K2, K3, and K4 to the formula to correct the existing deviations, so that the final prepared oil sample concentration is closer to the required oil sample concentration. After correction, it is not limited to more accurately calculating the volume of each component standard gas to be added according to formula (2):

[0070] (2)

[0071] Where:

[0072] K1—temperature correction coefficient (adjusted according to actual temperature);

[0073] K2—pressure correction factor (adjusted according to the actual pressure based on the required volume of standard gas);

[0074] K3—Solubility coefficient (the solubility coefficient is switched based on the monitored density to determine the transformer oil type);

[0075] K4—system correction coefficient;

[0076] X i —20℃, 101.325kPa dissolved gas component concentration in the standard sample oil, μL / L;

[0077] C ig —Concentration of component i in the standard gas, μL / L;

[0078] C io —Oil sample concentration before preparation, μL / L;

[0079] V L —Actual oil sample volume when prepared at a constant 50°C, mL.

[0080] The K4 value in the formula is not limited to being determined according to the actual oil distribution deviation, and each single-component gas is not limited to having a different K4 value.

[0081] Optionally, in order to prepare oil samples of any concentration, the requirements for the concentration detection range of each component in the technical specification for online monitoring of dissolved gas in transformer oil are comprehensively considered, and after optimizing the ratio, the oil sample preparation is not limited to using 7 bottles of high and low concentration single-component standard gas, and the concentration of the high and low concentration single-component standard gas is not limited to the following:

[0082] The concentration of single-component standard gas in the high-concentration group: H2: 37.5%, CO: 99.9%, CO2: 99.9%, CH4: 12%, C2H4: 12%, C2H6: 12%, C2H2: 6% (the remainder is N2);

[0083] The concentrations of single-component standard gas in the low-concentration group are: H2: 1.5%, CO: 18.8%, CO2: 18.8%, CH4: 0.45%, C2H4: 0.45%, C2H6: 0.45%, C2H2: 0.15% (the remainder is N2).

[0084] In the embodiment of the present application, a gas removal process and a standard gas ratio are added, and an oil sample with any concentration of 1% to 9% gas content can be prepared at one time; by detecting the temperature, pressure and type of the prepared oil sample during the preparation process, the temperature correction coefficient, pressure correction coefficient and solubility coefficient are automatically adjusted and involved in the calculation to improve the oil preparation accuracy; during the oil dissolution cycle, the standard gas is completely dissolved in the oil, and there is no need to perform an exhaust process after the preparation is completed, so the standard gas utilization rate is high and the standard gas usage is reduced;

[0085] The software is equipped with a chromatograph communication function to automatically detect the concentration of the oil sample in the cylinder after filtration and before preparation, and calculate the required standard gas volume to improve the accuracy of oil preparation. The oil sample concentration can be automatically detected and the measurement results can be displayed on the human-computer interaction interface of the oil sample preparation device.

[0086] The embodiment of the present application improves the level of automation in the preparation of gas-containing oil samples, realizes the fully automatic execution of oil filtering, spiked gas, oil and gas dissolution, and parameter calculation and setting, and communicates with a standard chromatograph to realize automatic measurement of the error of dissolved gas in the oil and use it as a parameter for oil sample configuration, thereby achieving a high degree of automation in the entire gas-containing oil sample configuration process.

[0087] At the same time, the preparation accuracy of gas-containing oil samples has been improved. High-purity N2 is used to degas and flush the oil samples, flush the standard gas pipeline, and circulate the oil circuit. Temperature, pressure, and density sensors are added to increase the correction coefficient, thereby improving the control accuracy of gas concentration in gas-containing oil samples. The preparation error of hydroxyl gases is no more than ±0.5uL / L at low concentrations, and the error at medium and high concentrations is no more than ±10% (higher than the ±20% of similar products), achieving a 100% one-time success rate in the preparation of gas-containing oil samples, greatly improving the efficiency of preparation and detection.

[0088] Example 2

[0089] A fully automatic high-precision gas-containing oil sample preparation device, such as Figure 4 As shown, the device includes: a preparation instrument, a detection instrument and a meter; the preparation instrument is connected to the meter through an air pipe, and the preparation instrument is connected to the detection instrument through an oil pipe;

[0090] The preparation instrument includes an oil cylinder and a well. The oil in the well enters the oil cylinder by evacuating the oil cylinder until the oil intake reaches the required amount. Air is passed through the oil cylinder to elute the gas concentration of each component in the oil. When the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to circulate and degas the oil.

[0091] The detector is used to detect the gas concentration in oil;

[0092] The meter is used to determine the correction factor based on the temperature sensor, pressure sensor, density sensor and gas inherent solubility coefficient, and calculate the required volume of each component standard gas according to the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration and the correction factor;

[0093] The mixer is also used to open the oil circulation pipeline to fully dissolve the standard gas after transferring each component standard gas to the oil cylinder according to volume; when the oil sample concentration obtained by the gas concentration detection in the oil reaches the required oil sample concentration, and when the pressure in the oil cylinder is maintained within a preset pressure range, the oil is discharged using the oil outlet valve.

[0094] Optionally, the oil cylinder is not limited to being provided with a piston, the piston divides the inner cavity of the oil cylinder into an upper cavity and a lower cavity, the upper cavity is used for oil, and the lower cavity is used for ventilation. The gas in the lower cavity and the gas in the oil sample are not limited to being controlled through the gas circuit, and the oil in and out are not limited to being controlled through the oil circuit.

[0095] The oil cylinder is connected to well 1, and well 1 is equipped with an oil level sensor. The oil cylinder is equipped with a speed sensor, a pressure sensor, and a density sensor. At the same time, an oil pump is connected between the upper chamber of the oil cylinder and the oil inlet valve. The upper chamber of the oil cylinder is connected to the oil inlet valve, the oil outlet valve, the waste oil valve, the oil extraction valve, the air valve, and the N2 valve through a piston. The oil inlet valve is connected to the oil pipe for oil injection into the oil cylinder; the oil outlet valve is connected to the oil pipe for discharging the oil in the oil cylinder; the waste oil valve is connected to the oil pipe for discharging the waste oil in the oil cylinder; the oil extraction valve is connected to the ball valve for taking oil samples for gas concentration detection in the oil.

[0096] The oil cylinder is connected to the air cylinder through an air pipe, and the air cylinder is connected to a positioning motor, and quantitative addition of gas volume is achieved through the positioning motor.

[0097] In the preparation instrument, the oil in well 1 is injected into the oil cylinder, and the oil cylinder is evacuated to allow the oil in the well to enter the oil cylinder until the oil intake reaches the required amount. Specifically, it is not limited to evacuating the lower chamber of the oil cylinder and back-blowing the well 1 pipeline to allow all the oil in well 1 to enter the oil cylinder, and pressurizing the lower chamber of the oil cylinder to discharge the upper gas in the upper chamber of the oil cylinder; the oil intake is calculated according to the position of the piston in the oil cylinder, and the oil intake is made to reach the required amount based on the oil inlet valve and the waste oil valve.

[0098] The oil intake amount is calculated according to the piston position in the oil cylinder, and the oil intake amount is made to reach the required oil amount based on the oil intake valve and the waste oil valve. Specifically, it is not limited to calculating the volume of the oil in the oil cylinder according to the piston position; when the volume is greater than the required oil amount, the lower chamber of the oil cylinder is pressurized and the waste oil valve is opened to discharge excess oil; when the volume is less than the required oil amount, the oil intake valve and the oil pump are opened, and the oil intake valve and the oil pump are closed after the required oil amount is reached.

[0099] The oil cylinder is evacuated to allow the oil in the well to enter the oil cylinder. Specifically, but not limited to, during the oil intake process, the density of the oil sample is detected by a density sensor.

[0100] Air is passed through the oil cylinder to elute the gas concentration of each component in the oil. Specifically, it is not limited to evacuating the lower chamber of the oil cylinder. At the same time, air is passed through the upper chamber of the oil cylinder. When the piston moves to the lowest position, the lower chamber of the oil cylinder is continuously evacuated; the upper chamber of the oil cylinder is evacuated, and the gas concentration of each sensitive component in the oil is eluted based on the air passed through the bottom; nitrogen elution is performed after a preset time.

[0101] When the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to carry out oil circulation degassing, which is specifically not limited to opening the oil cylinder's air extraction valve and air pump to vacuum the upper chamber of the oil cylinder. When the upper chamber of the oil cylinder is evacuated to the preset negative pressure, the air extraction valve and the air pump are closed, and the valve and oil pump of the oil circulation pipeline are opened to carry out oil circulation degassing. When the pressure in the upper chamber of the oil cylinder rises to a preset value, the upper chamber of the oil cylinder continues to be vacuumed, and the cycle is repeated until the gas content in the oil is fully removed.

[0102] When the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil. Specifically, but not limited to, when the lower chamber of the oil cylinder is pressurized to maintain the pressure within the preset pressure range, a syringe is connected to the oil extraction port, and the gas concentration in the oil is automatically sampled through a communication-connected chromatograph.

[0103] Inject the standard gas of each component into the oil cylinder according to the volume, specifically, the meter opens the N2 valve to flush the pipeline, and then evacuates all the pipelines of the meter and discharges the gas; opens a required sensitive component gas valve to inject the standard gas into the cylinder, and runs the cylinder to a preset position for metering, runs the cylinder to zero position after metering, and at the same time fully transfers the current standard gas, and flushes and discharges the pipeline with N2 again; adds other sensitive component standard gases according to the above steps until all the required sensitive component gases are transferred to the cylinder; injects the standard gas of each component of the cylinder into the oil cylinder through the air pipe.

[0104] In the embodiment of the present application, the fully automatic high-precision gas-containing oil sample preparation device eliminates the piston moving motor and only uses an air pump to draw vacuum and pressurize, forming a pressure difference between the upper and lower surfaces of the oil cylinder piston to control the movement of the piston, thereby improving the oil distribution efficiency and simplifying the mechanical structure; at the same time, it integrates the oil filtering function, and there is no need to prepare a blank oil sample; it also has Oil filter function to eliminate air , Impact on oil filtration effect and improve preparation accuracy.

[0105] The above-mentioned fully automatic high-precision gas-containing oil sample preparation method and device realize fully automatic control of the oil filtering, degassing, and standard gas filling processes, and realize high-precision control of the concentration of the configured gas, which can meet the application requirements of laboratory three-party testing, on-site calibration, and factory inspection of dissolved gas monitoring devices in oil, and can be widely used in third-party testing institutions for dissolved gas monitoring devices in oil for type testing and performance testing. At the same time, it can also be promoted and applied in many fields such as petrochemicals, environmental monitoring, energy research, and new material development.

[0106] Example 3

[0107] Another aspect of the embodiments of the present invention further provides an electronic device for implementing the above-mentioned fully automatic high-precision gas-containing oil sample preparation method, and the electronic device is not limited to being a terminal device or a server in the system. The electronic device is not limited to including a memory and a processor, the memory stores a computer program, and the processor is configured to execute the steps in any of the above-mentioned method embodiments through the computer program.

[0108] Example 4

[0109] Another aspect of the embodiments of the present invention provides a computer program product or a computer program, which includes computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the method provided in various optional embodiments of the above-mentioned fully automatic high-precision gas-containing oil sample preparation method. The computer program is configured to execute the steps of any of the above-mentioned method embodiments when it is run.

Claims

1. A fully automatic high-precision gas-containing oil sample preparation method, characterized in that: include: The oil cylinder is vacuumed to allow the oil in the well to enter the cylinder until the amount of oil entering reaches the required amount; Air is passed through the oil cylinder to elute the gas concentration of each component in the oil, and when the oil cylinder reaches a preset negative pressure, the valve and oil pump of the oil circulation pipeline are opened to degas the oil circulation; When the pressure in the oil cylinder is maintained within a preset pressure range, sampling is performed to detect the gas concentration in the oil, and a correction factor is determined based on the solubility coefficient corresponding to the oil sample type determined by the temperature sensor, the pressure sensor, and the density sensor. The required volume of standard gas of each component is determined based on the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration, and the correction factor. The correction factor is determined based on the temperature sensor, the pressure sensor, the density sensor, and the inherent solubility coefficient of the gas, including: determining the temperature correction coefficient based on the actual temperature measured by the temperature sensor; determining the pressure correction coefficient based on the actual pressure measured by the pressure sensor; determining the oil sample type based on the oil sample density detected by the density sensor, and determining the solubility coefficient based on the oil sample type; determining the correction coefficient based on the temperature correction coefficient, the pressure correction coefficient, the solubility coefficient, and the system coefficient; After transferring each component of standard gas to the oil cylinder according to volume, open the oil circulation pipeline to fully dissolve the standard gas and detect the gas concentration in the oil; When the oil sample concentration obtained by real-time detection of gas concentration in oil does not reach the required oil sample concentration, the oil distribution is adjusted based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration; when the oil sample concentration obtained by real-time detection of gas concentration in oil reaches the required oil sample concentration, oil is discharged through the oil outlet while the pressure in the oil cylinder is maintained within a preset pressure range.

2. The fully automatic high-precision gas-containing oil sample preparation method according to claim 1, characterized in that: The oil cylinder is vacuumed to allow the oil in the well to enter the cylinder until the oil intake reaches the required amount, including: The lower chamber of the oil cylinder is vacuumed and then the well pipeline is back-blown to allow all the oil in the well to enter the oil cylinder, wherein the lower chamber of the oil cylinder is a non-oil-inlet chamber; Pressurizing the lower chamber of the oil cylinder to discharge the gas in the upper chamber of the oil cylinder, wherein the upper chamber of the oil cylinder is the oil inlet chamber; The oil intake is calculated according to the position of the piston in the oil cylinder, and the oil intake is made to reach the required oil amount based on the oil intake valve and the waste oil valve, wherein the piston separates the inside of the oil cylinder into an upper chamber and a lower chamber of the oil cylinder.

3. The fully automatic high-precision gas-containing oil sample preparation method according to claim 2, characterized in that: The oil inlet volume is calculated based on the piston position in the cylinder, and the oil inlet volume is adjusted to the required volume based on the oil inlet valve and waste oil valve, including: Calculate the volume of oil in the cylinder based on the piston position; In case the volume is greater than the required oil volume, the lower chamber of the oil cylinder is pressurized and the waste oil valve is opened to discharge the excess oil; When the volume is less than the required oil volume, open the oil inlet valve and the oil pump, and close the oil inlet valve and the oil pump after the required oil volume is reached.

4. The fully automatic high-precision gas-containing oil sample preparation method according to claim 2, characterized in that: Air is passed through the oil cylinder to elute the gas concentration of each component in the oil, including: The lower chamber of the oil cylinder is evacuated, and air is passed through the upper chamber of the oil cylinder. When the piston moves to the lowest position, the lower chamber of the oil cylinder is continuously evacuated. The upper chamber of the oil cylinder is evacuated, and the concentration of each sensitive component gas in the oil is eluted based on the air passing through the bottom; Nitrogen elution was performed after a preset time.

5. The fully automatic high-precision gas-containing oil sample preparation method according to claim 2, characterized in that: When the oil cylinder reaches the preset negative pressure, open the valve and oil pump of the oil circulation pipeline to degas the oil circulation, including: Open the oil cylinder's vacuum valve and air pump to vacuum the upper chamber of the oil cylinder. When the upper chamber of the oil cylinder is evacuated to a preset negative pressure, close the vacuum valve and air pump, and open the valve and oil pump of the oil circulation pipeline to circulate and degas the oil. When the pressure in the upper chamber of the oil cylinder rises to a preset value, continue to vacuum the upper chamber of the oil cylinder. Repeat the cycle until the gas content in the oil is fully removed.

6. The fully automatic high-precision gas-containing oil sample preparation method according to claim 2, characterized in that: When the pressure in the oil cylinder is kept within the preset pressure range, sampling is performed to detect the gas concentration in the oil, including: When the lower chamber of the oil cylinder is pressurized to maintain the pressure within a preset pressure range, the gas concentration in the oil is detected by automatically sampling through a communication-connected chromatograph.

7. The fully automatic high-precision gas-containing oil sample preparation method according to claim 1, characterized in that: After calculating and determining the required volume of each component's standard gas, it also includes: The volume value of each component standard gas is transmitted to the meter through communication, and the meter determines the working distance of each component gas motor through calculation to inject each component standard gas into the oil cylinder according to the volume.

8. The fully automatic high-precision gas-containing oil sample preparation method according to claim 7, characterized in that: Inject each component of standard gas into the cylinder according to volume, including: Open the N2 valve to flush the pipeline, then evacuate all the pipelines of the meter and discharge the gas; Open a gas valve of a required sensitive component to inject the standard gas into the cylinder, and run the cylinder to the preset position for metering. After metering, run the cylinder to the zero position, and at the same time fully transfer the current standard gas, and use N2 to flush and discharge the pipeline again; Follow the above steps to add other sensitive component standard gases until all the required sensitive component gases are transferred to the cylinder; Inject the standard gases of each component of the cylinder into the oil cylinder through the air pipe.

9. A fully automatic high-precision gas-containing oil sample preparation device, characterized in that: include: A preparation instrument, a detection instrument and a meter; the preparation instrument is connected to the meter through an air pipe, and the preparation instrument is connected to the detection instrument through an oil pipe; The preparation instrument comprises an oil cylinder and a well, wherein the oil in the well enters the oil cylinder by evacuating the oil cylinder until the amount of oil entering the oil cylinder reaches the required amount; air is passed through the oil cylinder to elute the gas concentration of each component in the oil, and when the oil cylinder reaches a preset negative pressure, the valve and the oil pump of the oil circulation pipeline are opened to circulate and degas the oil; The detector is used to detect the gas concentration in oil; The meter is used to determine the correction coefficient based on the solubility coefficient corresponding to the oil sample type determined by the temperature sensor, the pressure sensor, and the density sensor, and to calculate and determine the required volume of each component standard gas according to the oil sample concentration obtained by the gas concentration detection in the oil, the remaining oil sample volume in the oil cylinder, the required oil sample concentration, and the correction coefficient; determine the correction coefficient based on the temperature sensor, the pressure sensor, the density sensor, and the inherent solubility coefficient of the gas, including: determining the temperature correction coefficient according to the actual temperature measured by the temperature sensor; determining the pressure correction coefficient according to the actual pressure measured by the pressure sensor; determining the oil sample type according to the oil sample density detected by the density sensor, and determining the solubility coefficient based on the oil sample type; determining the correction coefficient according to the temperature correction coefficient, the pressure correction coefficient, the solubility coefficient, and the system coefficient; The preparation instrument is also used to open the oil circulation pipeline to fully dissolve the standard gas after transferring each component standard gas to the oil cylinder according to volume; when the oil sample concentration obtained by real-time detection of the gas concentration in the oil does not reach the required oil sample concentration, adjust the oil preparation based on the detected oil sample concentration and the required oil sample concentration until the real-time detected oil sample concentration reaches the required oil sample concentration; when the oil sample concentration obtained by the gas concentration detection in the oil reaches the required oil sample concentration, the oil is discharged using the oil outlet valve when the pressure in the oil cylinder is maintained within a preset pressure range.

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