A crude oil analysis system and method

Abstract

The embodiment of the present invention discloses a crude oil analysis system and method, which includes: a multi-point sampler, a filter, a pressure pump, a pressure transmitter, a density meter, a water content analyzer, a data acquisition and control device, an artificial sampling port and a sampler; an oil outlet pipe and a return pipe are arranged on the multi-point sampler; the oil outlet pipe is connected to the filter, the filter is connected to the pressure pump, the pressure pump is connected to the density meter, and the pressure transmitter is installed between the pressure pump and the density meter; the density meter is connected to the water content analyzer; the water content analyzer is connected to the artificial sampling port, and the sampler is arranged in the artificial sampling port; the artificial sampling port is connected to the return pipe; the density meter is connected to the water content analyzer data; the data acquisition and control device are respectively connected to the pressure pump, the pressure transmitter, the density meter, the water content analyzer, the artificial sampling port and the sampler. Through the system composed of multiple instruments, real-time continuous measurement is realized, and the analysis results are consistent, and human factors will not directly affect the final results.

Description

Technical Field

[0001] The present invention relates to the technical field of crude oil analysis, and in particular to a crude oil analysis system and method. Background Art

[0002] Due to the diversity of crude oil components, the physical properties of crude oil from different oil-producing countries and oil production blocks or from oil wells with different production years and formation depths in the same oil production block in the same country may vary greatly. For example, the density, viscosity, pour point and other parameters of crude oil under standard conditions may be different; in addition, the impurities in crude oil from different origins, such as water, sulfur, salt, wax, colloid, asphaltene, sand, etc., are different except for hydrocarbon components. Therefore, online analysis of water content and density of crude oil has become a major industry problem.

[0003] At present, there is no online water content analysis instrument and device suitable for the diversity of crude oil component quality, so the production process has to use manual sampling or automatic sampling and laboratory analysis to obtain the water content and density of crude oil. However, no matter what method is used, the sampling + laboratory analysis method is an intermittent analysis method, which cannot achieve real-time and continuous detection. Moreover, for the same sample, different people will get different results due to operation, and human factors will directly affect the results.

[0004] Therefore, a better solution is now needed to solve the problems in the prior art. Summary of the invention

[0005] In view of this, the present invention proposes a crude oil analysis system and method, which realizes real-time continuous measurement through a system composed of multiple instruments, and the analysis results are consistent, and human factors will not directly affect the final results.

[0006] Specifically, the present invention proposes the following specific embodiments:

[0007] The embodiment of the present invention proposes a crude oil analysis system, comprising: a multi-point sampler, a filter, a data acquisition and control device, and an analysis subsystem; the analysis subsystem comprises: a pressure pump, a pressure transmitter, a density meter, a water content analyzer, an artificial sampling port and a sampler; wherein the multi-point sampler is used to be arranged on a crude oil main pipeline, the sampling surface of the multi-point sampler is perpendicular to the central axis of the crude oil main pipeline, and an oil outlet pipe and a return pipe are arranged on the multi-point sampler; the central axes of the oil outlet pipe and the return pipe are parallel and perpendicular to the central axis of the crude oil main pipeline; the filter, the pressure pump, the density meter, the water content analyzer and the artificial sampling port are arranged in sequence on the pipelines of the oil outlet pipe and the return pipe of the multi-point sampler; the pressure transmitter is arranged at the outlet of the pressure pump; the sampler is arranged in the artificial sampling port;

[0008] The density meter is data-connected to the water content analyzer, and the density meter transmits the measured density data to the water content analyzer; the data acquisition and control device is respectively connected to the pressure pump, the pressure transmitter, the density meter, the water content analyzer and the sampler.

[0009] In a specific embodiment, the oil outlet pipe, the return pipe, the inlet of the sampler and the outlet of the manual sampling port are all provided with valves;

[0010] The multi-point sampler includes: a hub-and-spoke sampler;

[0011] The filter comprises: a basket-type quick-release filter;

[0012] The water content analyzer comprises: a water content analyzer based on the microwave resonance principle and configured with an Autozero function.

[0013] In a specific embodiment, the densitometer is installed at a position close to the inlet side of the water content analyzer; and the artificial sampling port is installed at a position close to the outlet side of the water content analyzer.

[0014] In a specific embodiment, it also includes: a static mixer; the static mixer is arranged upstream of the multi-point sampler.

[0015] In a specific embodiment, it also includes: a flow meter; the flow meter is arranged at an upstream position or a downstream position of the multi-point sampler on the crude oil main pipeline; the flow meter data is connected to the data acquisition and control device.

[0016] In a specific embodiment, a thermometer is also included; the thermometer is connected to the data acquisition and control device to detect the temperature of the crude oil flowing through the analysis subsystem.

[0017] In a specific embodiment, it also includes: a sewage discharge device, an electric heating and heat preservation device and a combustible gas alarm device;

[0018] The sewage discharge sub-device is connected to the analysis sub-system to discharge the crude oil in the analysis sub-system;

[0019] The electric heating and heat preservation device is arranged close to the analysis subsystem to control the temperature of the crude oil in the analysis subsystem.

[0020] The embodiment of the present invention further discloses a crude oil analysis method, which is applied to the above-mentioned crude oil analysis system. The method comprises:

[0021] Acquire the density value measured by the densitometer and obtain the first moisture content measured by the moisture analyzer based on the density value through a data acquisition and control device;

[0022] Determine a second moisture content based on a density method and the density value by a data acquisition and control device;

[0023] If the first moisture content and the second moisture content are both less than a preset value, the first moisture content is used as the final moisture content;

[0024] If the second moisture content is greater than a preset value, the second moisture content is used as the final moisture content.

[0025] In a specific embodiment, the first moisture content measured by the moisture analyzer is obtained by iteratively calculating the following two formulas:

[0026]

[0027]

[0028] Wherein, β1 is the first moisture content; ρ oilTP is the density of pure oil under working conditions; ε mix is the dielectric constant of crude oil measured by water content analysis; ε water is the dielectric constant of pure water; ε oil is the dielectric constant of pure oil; ρ Water is the density of pure water; ρ mix Density value measured by a densitometer.

[0029] In a specific embodiment, the second moisture content is calculated based on the following formula:

[0030] β2=(ρ mix -ρ oil )*100 / (ρ Water –ρ oil );

[0031] Wherein, β2 is the second moisture content; ρ mix is the density value measured by the densitometer; ρ oil is the density of pure oil; Water is the density of pure water.

[0032] Thus, the embodiment of the present invention proposes a crude oil analysis system and method, the system includes: a multi-point sampler, a filter, a data acquisition and control device, and an analysis subsystem; the analysis subsystem includes: a pressure pump, a pressure transmitter, a density meter, a water content analyzer, a manual sampling port and a sampler; the multi-point sampler is used to be arranged on the crude oil main pipeline, the sampling surface of the multi-point sampler is perpendicular to the central axis of the crude oil main pipeline, and the multi-point sampler is provided with an oil outlet pipe and a return pipe; the central axes of the oil outlet pipe and the return pipe are parallel and both are aligned with the central axis of the crude oil main pipeline vertical; the filter, the booster pump, the density meter, the water content analyzer and the manual sampling port are arranged in sequence on the pipelines of the oil outlet pipe and the return pipe of the multi-point sampler; the pressure transmitter is arranged at the outlet of the booster pump; the sampler is arranged in the manual sampling port; the density meter is data-connected with the water content analyzer, and the density meter transmits the measured density data to the water content analyzer; the data acquisition and control device are respectively connected to the booster pump, the pressure transmitter, the density meter, the water content analyzer and the sampler. Through the system composed of multiple instruments, real-time continuous measurement is achieved, and the analysis results are consistent, and human factors will not directly affect the final results. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope of protection of the present invention. In each of the drawings, similar components are numbered similarly.

[0034] Figure 1 A schematic structural diagram of a crude oil analysis system is shown;

[0035] Figure 2 A partial structural schematic diagram of a crude oil analysis system is shown;

[0036] Figure 3 A partial structural schematic diagram of a crude oil analysis system is shown;

[0037] Figure 4 A schematic diagram of the framework structure of a crude oil analysis system is shown;

[0038] Figure 5 A schematic diagram of the flow structure of a crude oil analysis method is shown.

[0039] Legend:

[0040] 10-multi-point sampler; 11-sampling surface; 12-oil outlet pipe; 13-return pipe;

[0041] 20-filter; 30-boosting pump; 40-pressure transmitter; 50-density meter; 60-water content analyzer; 70-data acquisition and control device; 80-artificial sampling port; 90-sampler;

[0042] 100-valve; 110-flow meter. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] Hereinafter, the terms "including", "having" and their cognates, which may be used in various embodiments of the present invention, are intended only to indicate specific features, numbers, steps, operations, elements, components or combinations of the foregoing items, and should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing items or adding the possibility of one or more features, numbers, steps, operations, elements, components or combinations of the foregoing items.

[0046] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0047] Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meanings as those generally understood by those skilled in the art to which the various embodiments of the present invention belong. The terms (such as those defined in generally used dictionaries) will be interpreted as having the same meanings as the contextual meanings in the relevant technical field and will not be interpreted as having idealized meanings or overly formal meanings unless clearly defined in the various embodiments of the present invention.

[0048] Example 1

[0049] Embodiment 1 of the present invention discloses a crude oil analysis system, such as Figure 1As shown, it includes: a multi-point sampler 10, a filter 20, a data acquisition and control device 70, and an analysis subsystem; the analysis subsystem includes: a pressure pump 30, a pressure transmitter 40, a density meter, a water content analyzer 60, a manual sampling port 80 and a sampler 90; wherein, as Figure 1 As shown, the multi-point sampler 10 is arranged on the crude oil main pipeline, the sampling surface 11 of the multi-point sampler 10 is perpendicular to the central axis of the crude oil main pipeline, and the multi-point sampler 10 is provided with an oil outlet pipe 12 and a return pipe 13; a plurality of sampling holes are arranged on the sampling surface 11, and all the sampling holes are connected to the oil outlet pipe 12; the central axes of the oil outlet pipe 12 and the return pipe 13 are parallel and perpendicular to the central axis of the crude oil main pipeline; specifically, the crude oil main pipeline is generally large in diameter, for example, the diameter may be 150-700mm, and the viscosity of the crude oil itself varies widely, and the water-containing crude oil transported in the crude oil pipeline The mixing of oil may not be uniform due to the viscosity and flow rate of the crude oil itself. Therefore, in this solution, a multi-point sampler 10 is used to perform sampling in the crude oil main pipeline. In particular, a hub-and-spoke sampler is selected as the multi-point sampler 10 for sampling, and the hub-and-spoke sampler itself has a static mixing effect. In this way, the crude oil at multiple locations in the crude oil main pipeline is integrated, so that the crude oil sampled at multiple locations is closer to the characteristics of the crude oil in the crude oil main pipeline after merging. The analysis results obtained in this solution, such as water content and density, can better represent the actual parameters of the main crude oil, that is, the results are more accurate.

[0050] The sampling surface 11 of the multi-point sampler 10 is vertically installed in the crude oil main pipeline, that is, the sampling surface 11 is perpendicular to the central axis of the crude oil main pipeline, and the sampling surface 11 is facing the crude oil flow direction in the crude oil main pipeline, so that sampling can be better achieved with the help of the pressure of the crude oil flow.

[0051] In order to realize real-time and uninterrupted detection and analysis, and better connect with other instruments and equipment, the multi-point sampler 10 is provided with an oil outlet pipe 12 and a return pipe 13. The central axes of the oil outlet pipe 12 and the return pipe 13 are parallel and perpendicular to the central axis of the crude oil main pipeline. In this way, the crude oil sampled by the multi-point sampler 10 flows to other instruments and equipment through the oil outlet pipe 12, and finally flows back to the crude oil main pipeline from the return pipe 13; the setting of the oil outlet pipe 12 and the return pipe 13 perpendicular to the original main pipeline is also conducive to the connection with other instruments and equipment.

[0052] The filter 20, the booster pump 30, the density meter 50, the water content analyzer 60 and the manual sampling port 80 are sequentially arranged on the pipelines of the oil outlet pipe 12 and the return pipe 13 of the multi-point sampler 10; the pressure transmitter 40 is arranged at the outlet of the booster pump 30; and the sampler 90 is arranged in the manual sampling port 80.

[0053] The oil outlet pipe 12 is connected to the inlet of the filter 20, the outlet of the filter 20 is connected to the inlet of the booster pump 30, the outlet of the booster pump 30 is connected to the inlet of the density meter 50, and the pressure transmitter 40 is installed between the booster pump 30 and the density meter 50; the outlet of the density meter 50 is connected to the inlet of the water content analyzer 60; the outlet of the water content analyzer 60 is connected to the inlet of the manual sampling port 80, and the sampler 90 is arranged in the manual sampling port 80; the outlet of the manual sampling port 80 is connected to the return pipe 13;

[0054] Specifically, Figure 1 , Figure 2 and Figure 3 As shown, after the crude oil is sampled from the crude oil main pipeline by the multi-point sampler 10, the instruments and equipment it passes through are the filter 20, the pressure pump 30, the density meter 50, the water content analyzer 60, the manual sampling port 80, and the sampler 90, and finally flows back to the crude oil main pipeline through the reflux pipe 13.

[0055] In this solution, the filter 20 can filter out impurities in the crude oil to protect the booster pump 30. The booster pump 30 is configured to pressurize the extracted crude oil sample and further mix the oil and water, ensuring that the crude oil sample passes through the density meter 50 and the water content analyzer 60 in a certain flow rate and mixing state.

[0056] Specifically, the density meter 50 is used to detect the working density of the oil-water mixed sample and to cooperate with the water content meter to make real-time corrections to the crude oil components (pure oil dielectric constant); the pressure transmitter 40 is used in the system to monitor the outlet pressure of the booster pump 30 and the operating status of the booster pump 30, and plays a role in system diagnosis; the water content analyzer 60 is a Roxar online water content analyzer 60 based on the microwave resonance principle and free of cleaning and configured with Autozero function.

[0057] The density meter 50 is installed at a position close to the inlet side of the water analyzer 60; the manual sampling port 80 is installed at a position close to the outlet side of the water analyzer 60. Therefore, the density meter 50, the water analyzer 60, and the manual sampling port 80 are installed close to each other to ensure that the flow field of the mixture of crude oil and water flowing through the three is as consistent as possible, thereby improving the detection accuracy of the instrument.

[0058] A sampler 90 is installed in the manual sampling port 80. The manual sampling port 80 is arranged near the downstream of the water content analyzer 60 to obtain a sample that is consistent with the sample flowing through the water content analyzer 60, and compare the laboratory analysis result with the system reading. The sampler 90 is installed at the manual sampling port 80 and automatically connected to the data acquisition and control device 70 to obtain the crude oil sample in the manual sampling port 80. The data acquisition and control device 70 can control the opening and closing of the manual sampling port 80 and whether the sampler 90 works or not.

[0059] The densitometer 50 is data-connected with the water content analyzer 60; the densitometer 50 transmits the measured density data to the water content analyzer 60; specifically, the detection result obtained by the densitometer 50 is transmitted to the water content analyzer 60, the densitometer 50 may be a pipeline Coriolis densitometer 50; and the water content analyzer 60 may be a microwave resonance-based water content analyzer 60 with an Autozero function. So that the water content analyzer 60 can correct the change in the dielectric constant of the pure oil caused by the change in the pure oil density in real time based on the density signal detected by the densitometer 50.

[0060] In order to enable online real-time detection, a data acquisition and control device 70 is also provided in the present solution; the data acquisition and control device 70 is respectively connected to the pressure pump 30, the pressure transmitter 40, the density meter 50, the water content analyzer 60, the manual sampling port 80 and the sampler 90. The data of the connected instruments is obtained through the data acquisition and control device 70 for subsequent processing, such as uploading to a cloud server through the network module of the data acquisition and control device 70 itself or transmitting to a remote device for display, etc.

[0061] Specifically, the data acquisition and control device 70 may include an outdoor unit of the data acquisition system: it is installed in an explosion-proof control box in the system, and collects field signals through PLC (Programmable Logic Controller), input / output and communication modules, processes and communicates with the indoor unit HMI data; it also includes: an indoor HMI (Human Machine Interface) unit of the data acquisition system: used for data display / recording, system configuration, diagnosis / alarm information, analysis system calibration / comparison and signal communication with the host computer or DCS (Distributed Control System), and the HMI has built-in oil-water mixing correction software for correcting the oil-water mixing state; specifically, the data acquisition and control device 70 may also include a network module, such as a 4G module, etc., and a corresponding APP (application) may be installed on the terminal, and the APP installed in the mobile terminal device is connected to the cloud server connected to the data acquisition and control device 70 to monitor process variables, system detection values, alarm and diagnostic information.

[0062] In this way, the system composed of multiple instruments in this scheme realizes the real-time and continuous measurement of crude oil, and the analysis results are consistent, and human factors will not directly affect the final results. Based on the settings of the density meter 50 and the water content analyzer 60, this scheme can simultaneously collect the water content output by the water content analyzer 60 and the water content obtained by the density method based on the density detected by the density meter 50. In this way, when the water content is lower than 50%, the system obtains two water contents at the same time, and the water content output by the water content analyzer 60 is the final output value; when the water content of the monitored crude oil is higher than the working range of the microwave method (generally around 50%), the water content meter will output an over-range information, and the system will select the water content measured by the output density method as the output water content of the system, so that the online water content analysis system can achieve full-range measurement without blind spots. After testing, this scheme can achieve measurement without blind spots within the water content range of 0-100%.

[0063] Example 2

[0064] Embodiment 2 of the present invention further discloses a crude oil analysis system. Based on embodiment 1, embodiment 2 of the present invention further defines that: the oil outlet pipe 12, the return pipe 13, the inlet of the sampler 90 and the outlet of the manual sampling port 80 are all provided with valves 100; the filter 20 includes: a basket-type quick-release filter 20;

[0065] Specifically, Figure 1 As shown, considering the actual installation and disassembly, valves 100 are provided at the oil outlet pipe 12, the return pipe 13, the inlet of the sampler 90 and the outlet of the manual sampling port 80. By closing the valve 100, leakage of crude oil during installation and disassembly is avoided; in addition, the filter 20 can use a basket-type quick-release filter 20 for easy disassembly.

[0066] In addition, in a specific embodiment, the system may further include: a static mixer; the static mixer is arranged upstream of the multi-point sampler 10 .

[0067] Specifically, based on the setting of the static mixer, the mixing effect of the crude oil can be further improved to ensure the accuracy of the analysis of the system in this bill.

[0068] In a specific embodiment, it also includes: a flow meter 110; the flow meter 110 is arranged at an upstream position or a downstream position of the multi-point sampler 10 on the crude oil main pipeline; and the flow meter 110 is data-connected to the data acquisition and control device 70.

[0069] Specifically, based on the setting of the flow meter 110, the flow rate of the crude oil flowing through the crude oil main pipeline can also be monitored.

[0070] In addition, if Figure 4As shown, a pressure pump 30, a pressure transmitter 40, a density meter 50, a water content analyzer 60, a manual sampling port 80 and a sampler 90 constitute an analysis subsystem.

[0071] In a specific embodiment, a thermometer is also included; the thermometer is arranged in the analysis subsystem, and the thermometer is connected to the data acquisition and control device 70; and is used to detect the temperature of the crude oil flowing through the analysis subsystem.

[0072] In a specific embodiment, for the needs of inspection and maintenance, a sewage discharge device is also included; the sewage discharge device is connected to the analysis subsystem to drain the crude oil in the analysis subsystem. The specific sewage discharge device can be a valve 100 and an air pressure device or a water pressure device arranged in the connection analysis subsystem, and the analysis subsystem is pressurized by the air pressure device or the water pressure device, and one valve 100 is opened, and other valves 100 are controlled to be closed, so as to drain the crude oil in the analysis subsystem; in addition, the specific sewage discharge device can also be the valve 100 located at the lowest position in the analysis subsystem, and when the valve 100 at the lowest position is opened, the crude oil in the analysis subsystem can also be drained.

[0073] In a specific embodiment, it also includes: an electric heat tracing and heat preservation device; the electric heat tracing and heat preservation device is set close to the analysis subsystem to control the temperature of the crude oil in the analysis subsystem. Specifically, based on the electric heat tracing and heat preservation device, each specific device in the entire analysis subsystem has good fluidity and protects the devices in the system when the booster pump 30 stops pumping.

[0074] In a specific embodiment, it also includes: a combustible gas alarm device; the combustible gas alarm device is arranged near the analysis subsystem to warn of combustible gas leaked from the analysis subsystem. Specifically, considering that combustible gases such as light hydrocarbons or methane may be mixed in crude oil, and combustible gases are easy to escape and cause explosion and other dangers, in this case, a combustible gas alarm device is arranged to detect whether combustible gas is leaked from the analysis subsystem, and to alarm when leakage is detected.

[0075] In a specific embodiment, it also includes: a cold light illumination device; the cold light illumination device is arranged at a position close to the analysis subsystem to illuminate the range where the analysis subsystem is located.

[0076] Taking into account the specific environment of the analysis subsystem, there may be flammable gas leakage, and the analysis subsystem may need to work at night. In this case, a cold light lighting device is also provided to illuminate the area where the analysis subsystem is located.

[0077] In addition to the above-mentioned devices or modules, the system may also include a viscosity measuring device to monitor the crude oil in the crude oil main pipeline to provide viscosity data to improve transportation efficiency and save energy and reduce consumption.

[0078] Example 3

[0079] In order to further illustrate the scheme of the present invention, Example 3 of the present invention further discloses a crude oil analysis method, which is applied to the crude oil analysis system of Example 1 or Example 2, such as Figure 5 As shown, the method comprises the following steps:

[0080] Step S101, obtaining a density value measured by a densitometer and a first moisture content obtained by a moisture analyzer based on the density value through a data acquisition and control device;

[0081] In a specific embodiment, the first moisture content measured by the moisture analyzer is obtained by iteratively calculating the following two formulas:

[0082]

[0083]

[0084] Among them, β1 is the first moisture content; ρ oilTP is the density of pure oil under working conditions; ε mix is the dielectric constant of crude oil measured by the water content analyzer; ε water is the dielectric constant of pure water; ε oil is the dielectric constant of pure oil; ρ Water is the density of pure water; ρ mix is the density value measured by the densitometer. oilTP In the next iteration, the corresponding dielectric constant ε of pure oil can be obtained oil ; Continue iterating until the required accuracy is achieved.

[0085] As mentioned above, the water content analyzer eliminates the measurement uncertainty caused by the change of oil product components; in addition, the mixing ability of crude oil and water of different components can be corrected (that is, according to the pure oil density of the crude oil component characteristic index, the influence of the oil-water mixing ability on the water content measurement is corrected in sections based on the different pure oil density ranges). Specifically, the Roxar online water content analyzer is selected. Because its working principle adopts the microwave resonance principle, a microwave antenna transmits a microwave spectrum into the resonance cavity, and another microwave antenna searches for the frequency of the resonance wave caused by the change of the dielectric constant of the oil-water mixture, that is, the resonance frequency. Because the influence of the probe attachment on the measurement is avoided in principle, no additional deviation will be generated due to probe contamination. In addition, the water content analyzer is connected to the density meter, and the density of the pure oil is finally obtained based on the crude oil density measured by the density meter, and then the dielectric parameters of the pure oil are obtained, and then a more accurate water content is obtained. In addition, the water content can be corrected based on the density of different crude oils. The first water content output by the water content analyzer eliminates the influence of the crude oil component change on the dielectric constant of the pure oil and the influence of the oil-water mixing ability caused by the component change on the analysis results.

[0086] Specifically, based on the oil-water mixed density under working conditions measured by a densitometer, the density under standard conditions at 20°C or 15°C and the density of pure oil under standard conditions can be obtained through standard conversion.

[0087] Specifically, according to formula (1), if we want to obtain the water content of the oil-water mixture (i.e. crude oil) in a closed pipeline, as long as the dielectric constants of pure oil and water are known, the dielectric constant of the oil-water mixture (i.e. crude oil) flowing through the sensor at every moment can be obtained through the water analyzer, and then the water content can be obtained. However, the premise is that the dielectric constant of pure oil must be a known number that changes according to the change of crude oil components. The Autozero function of Roxar's online water analyzer can solve the change of the dielectric constant of pure oil caused by the change of crude oil components. The water content finally achieved makes real-time automatic correction for the change of dielectric constant caused by the change of crude oil density at 15°C from the perspective of the analyzer.

[0088] Specifically, the relationship between the density and dielectric constant of pure oil at the standard state of 15°C established in the laboratory can be realized. If the density of pure oil at the standard state of 15°C is known, the dielectric constant of pure oil can be easily obtained through this relationship. The working condition pure oil density can be obtained through the Autozero function by combining the two sensors of the microwave resonance online density meter and the Coriolis force principle online density meter installed nearby, that is, by the mutual high-speed iterative operation between formula (1) and formula (2), thereby obtaining the output of the water content corrected by the component.

[0089] Step S102, determining a second moisture content based on a density method and a density value;

[0090] Specifically, the second moisture content is calculated based on the following formula:

[0091] β2=(ρ mix -ρ oil )*100 / (ρ Water –ρ oil );

[0092] Where, β2 is the second moisture content; ρ mix is the density value measured by the densitometer; ρ oil is the density of pure oil; ρ Water is the density of pure water.

[0093] Step S103: if the first moisture content and the second moisture content are both less than the preset value, the first moisture content is used as the final moisture content;

[0094] Step S104: If the second moisture content is greater than the preset value, the second moisture content is used as the final moisture content.

[0095] Specifically, when the moisture content exceeds a preset value, such as 50%, the moisture analyzer will output an over-range message. In this case, the second moisture content obtained based on the density meter will be directly selected as the final moisture content; when the moisture content is detected to be lower than 50% (specifically, the difference between the moisture content values ​​obtained by the moisture analyzer and the density meter will not be too large, so when the actual moisture content is less than the preset value, both the first moisture content and the second moisture content will be less than the preset value), the measurement accuracy of the moisture analyzer will be higher, so the first moisture content value will be selected as the final moisture content value.

[0096] Thus, the embodiment of the present invention proposes a crude oil analysis system and method, the system comprising: a multi-point sampler 10, a filter 20, a data acquisition and control device 70, and an analysis subsystem; the analysis subsystem comprises: a pressure pump 30, a pressure transmitter 40, a density meter 50, a water content analyzer 60, an artificial sampling port 80 and a sampler 90; wherein the multi-point sampler 10 is arranged on the crude oil main pipeline, and an oil outlet pipe 12 and a return pipe 13 are arranged on the multi-point sampler 10; the central axes of the oil outlet pipe 12 and the return pipe 13 are parallel and perpendicular to the central axis of the crude oil main pipeline; the oil outlet pipe 12 and the return pipe 13 of the multi-point sampler 10 are parallel and perpendicular to the central axis of the crude oil main pipeline; The filter 20, the booster pump 30, the density meter 50, the water content analyzer 60 and the manual sampling port 80 are sequentially arranged on the pipeline of 3; the pressure transmitter 40 is arranged at the outlet of the booster pump 30; the sampler 90 is arranged in the manual sampling port 80; the pressure transmitter 40 is arranged at the outlet of the booster pump 30; the sampler 90 is arranged in the manual sampling port 80; the density meter 50 is data connected with the water content analyzer 60; the data acquisition and control device 70 is respectively connected with the booster pump 30, the pressure transmitter 40, the density meter 50, the water content analyzer 60, the manual sampling port 80 and the sampler 90. Through the system composed of multiple instruments, real-time continuous measurement is achieved, and the analysis results are consistent, and human factors will not directly affect the final results.

[0097] In several embodiments provided in the present application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely schematic. For example, the flowcharts and structure diagrams in the accompanying drawings show the possible architecture, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, a program segment or a part of a code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in an alternative implementation, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the structure diagram and / or the flow diagram, and the combination of boxes in the structure diagram and / or the flow diagram, can be implemented with a dedicated hardware-based system that performs a specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0098] In addition, the functional modules or units in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0099] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (which can be a smart phone, a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0100] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crude oil analysis system, characterized in that: include: Multi-point samplers, filters, data acquisition and control devices, and analytical subsystems; The analysis subsystem includes: a pressure pump, a pressure transmitter, a density meter, a water content analyzer, a manual sampling port and a sampler; The multi-point sampler is used to be arranged on the crude oil main pipeline, the sampling surface of the multi-point sampler is perpendicular to the central axis of the crude oil main pipeline, and an oil outlet pipe and a return pipe are arranged on the multi-point sampler; the central axes of the oil outlet pipe and the return pipe are parallel and perpendicular to the central axis of the crude oil main pipeline; the filter, the booster pump, the density meter, the water content analyzer and the artificial sampling port are arranged in sequence on the pipelines of the oil outlet pipe and the return pipe of the multi-point sampler; the pressure transmitter is arranged at the outlet of the booster pump; the sampler is arranged in the artificial sampling port; The density meter is data-connected with the water content analyzer, and the density meter transmits the measured density data to the water content analyzer; the data acquisition and control device is respectively connected to the pressure pump, the pressure transmitter, the density meter, the water content analyzer and the sampler; The data acquisition and control device is used to obtain the density value measured by the densitometer and the first moisture content obtained by the moisture analyzer based on the density value, and determine the second moisture content based on the density method and the density value. If the first moisture content and the second moisture content are both less than the preset value, the first moisture content is used as the final moisture content; if the second moisture content is greater than the preset value, the second moisture content is used as the final moisture content.

2. The system according to claim 1, characterized in that The oil outlet pipe, the return pipe, the inlet of the sampler and the outlet of the manual sampling port are all provided with valves; The multi-point sampler includes: a hub-and-spoke sampler; The filter comprises: a basket-type quick-release filter; The water content analyzer comprises: a water content analyzer based on the microwave resonance principle and configured with an Autozero function.

3. The system according to claim 1, characterized in that The densitometer is installed at a position close to the inlet side of the water content analyzer; the artificial sampling port is installed at a position close to the outlet side of the water content analyzer.

4. The system according to claim 1, characterized in that Also includes: Static mixer; the static mixer is arranged upstream of the multi-point sampler.

5. The system according to claim 1, wherein: Also includes: Flow meter; the flow meter is arranged at an upstream position or a downstream position of the multi-point sampler on the crude oil main pipeline; The flow meter data is connected to the data acquisition and control device.

6. The system according to claim 1, wherein: It also includes a thermometer; the thermometer is connected to the data acquisition and control device to detect the temperature of the crude oil flowing through the analysis subsystem.

7. The system according to claim 1, characterized in that Also includes: Sewage discharge device, electric heating and insulation device and combustible gas alarm device; The sewage discharge device is connected to the analysis subsystem to discharge the crude oil in the analysis subsystem; The electric heating and heat preservation device is arranged close to the analysis subsystem to control the temperature of the crude oil in the analysis subsystem.

8. A crude oil analysis method, characterized in that: Applied to the crude oil analysis system according to any one of claims 1 to 7, the method comprising: Acquire the density value measured by the densitometer and acquire the first moisture content obtained by the moisture analyzer based on the density value through a data acquisition and control device; Determine a second moisture content based on a density method and the density value by a data acquisition and control device; If the first moisture content and the second moisture content are both less than a preset value, the first moisture content is used as the final moisture content; If the second moisture content is greater than the preset value, the second moisture content is used as the final moisture content.

9. The method according to claim 8, characterized in that The first moisture content measured by the moisture analyzer is obtained by iterative calculation using the following two formulas: Wherein, β1 is the first moisture content; ρ oilTP is the density of pure oil under working conditions; ε mix is the dielectric constant of crude oil measured by water content analysis; ε water is the dielectric constant of pure water; ε oil is the dielectric constant of pure oil; ρ water is the density of pure water; ρ mix Density value measured by a densitometer.

10. The method according to claim 8, characterized in that The second moisture content is calculated based on the following formula: β2=(ρ mix -r oil )*100 / (ρ water –r oil ); Wherein, β2 is the second moisture content; ρ mix is the density value measured by the densitometer; ρ oil is the density of pure oil; water is the density of pure water.

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