Crude oil water content correction device and method

Abstract

The present invention provides a correction device and method for the water content of crude oil, the device comprising: a temperature sensor, a pressure sensor, a density tester, a water content tester and a processing device; the temperature sensor, the pressure sensor, the density tester and the water content tester are respectively connected to the processing device for communication; the temperature sensor and the pressure sensor are arranged at one end of the crude oil pipeline close to the crude oil inlet; the water content tester is arranged at one end of the crude oil pipeline close to the crude oil outlet; the density tester is arranged in the middle of the crude oil pipeline. The correction device for the water content of crude oil provided by the present invention takes into account the influence of residual gas when obtaining the water content of crude oil, thereby improving the accuracy of the obtained water content of crude oil.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas development, and in particular to a device and method for correcting the water content of crude oil. Background Art

[0002] In the process of oil and gas field development, oil, gas and water are produced from oil and gas wells at the same time. In order to obtain effective oil and gas energy, the oil, gas and water mixture produced by oil and gas wells usually passes through a gas-liquid separator to separate the natural gas component in the oil, gas and water mixture for use as energy. The detection of water content in the separated oil and water mixture is an important task in oilfield engineering. The accuracy of water content detection directly affects the sustainable production of oil and gas fields.

[0003] In the prior art, the detection methods of water content in crude oil are usually divided into manual measurement method and online measurement method, both of which are based on the different characteristics of oil and water. For example, based on the different acceptance capabilities of oil and water in the oil-water mixture to electromagnetic waves, the water content in crude oil is detected by the different intensities of the received electromagnetic waves.

[0004] However, when the natural gas in the oil-gas-water mixture is separated by a gas-liquid separator, the crude oil after gas-liquid separation will contain a certain amount of natural gas to a greater or lesser extent due to the influence of the separator performance or other factors. The presence of natural gas will have a certain impact on the detection accuracy of the water content of the crude oil, resulting in errors in the detection results of the water content of the crude oil. Summary of the invention

[0005] The present invention provides a correction device and method for the water content of crude oil. When obtaining the water content of crude oil after gas is separated by a gas-liquid separator, the influence of residual gas is taken into consideration, thereby improving the accuracy of the obtained water content of crude oil.

[0006] A first aspect of the present invention provides a correction device for the water content of crude oil, comprising: a temperature sensor, a pressure sensor, a density tester, a water content tester and a processing device;

[0007] The temperature sensor, pressure sensor, density tester, and moisture content tester are respectively connected to the processing equipment for communication;

[0008] The temperature sensor and the pressure sensor are arranged at one end of the crude oil pipeline close to the crude oil inlet; the water content tester is arranged at one end of the crude oil pipeline close to the crude oil outlet; the density tester is arranged in the middle of the crude oil pipeline;

[0009] The processing device is used to obtain the density of the residual gas in the crude oil at each moment according to the temperature of the residual gas in the crude oil at each moment collected by the temperature sensor and the pressure of the residual gas in the crude oil at each moment collected by the pressure sensor;

[0010] The processing device is used to obtain the density of the crude oil and the density of water in the crude oil according to the pre-stored oil testing data of the crude oil;

[0011] The processing device is also used to correct the test volume water content of the crude oil at each moment collected by the water content tester according to the density of the residual gas in the crude oil at each moment, the density of the crude oil, the density of water in the crude oil, the mixed density of the crude oil mixture at each moment collected by the density tester and a pre-stored correction model, so as to obtain the corrected volume water content of the crude oil at each moment.

[0012] Optionally, the crude oil pipeline is a corner pipeline, and the temperature sensor, pressure sensor, and density tester are respectively vertically arranged above the crude oil pipeline; the water content tester is arranged parallel to the crude oil pipeline at the corner of the crude oil pipeline.

[0013] Optionally, the crude oil pipeline is a linear pipeline, and the temperature sensor, pressure sensor, density tester, and water content tester are respectively vertically installed above the crude oil pipeline.

[0014] Optionally, the test probe of the temperature sensor, the test probe of the pressure sensor, the test probe of the density tester, and the test probe of the water content tester are arranged below the liquid surface of the crude oil.

[0015] Optionally, the test probe of the temperature sensor, the test probe of the pressure sensor, and the test probe of the density tester are arranged in a direction perpendicular to the flow direction of the crude oil at the inlet of the crude oil pipeline;

[0016] The setting direction of the test probe of the water content tester is perpendicular to the flow direction of the crude oil at the outlet of the crude oil pipeline.

[0017] Optionally, the test probe of the temperature sensor, the test probe of the pressure sensor, the test probe of the density tester, and the test probe of the moisture content tester are set at the same height.

[0018] Optionally, the correction device also includes: an analog-to-digital A / D converter, the temperature sensor, pressure sensor, density tester, and moisture content tester are respectively connected to the A / D converter, and the A / D converter is connected to the processing equipment.

[0019] Optionally, the processing device is an intelligent meter, an industrial computer or a digital selective calling DSC terminal.

[0020] A second aspect of the present invention provides a method for correcting the water content of crude oil, comprising:

[0021] According to the temperature and pressure of the residual gas in the crude oil at each moment, obtaining the density of the residual gas in the crude oil at each moment;

[0022] According to the oil testing data of the crude oil, the density of the crude oil and the density of water in the crude oil are obtained;

[0023] According to the density of the residual gas in the crude oil at each moment, the density of the crude oil, the density of water in the crude oil, the mixed density of the crude oil mixture at each moment and a pre-stored correction model, the test volume water content of the crude oil at each moment is corrected to obtain the corrected volume water content of the crude oil at each moment.

[0024] Optionally, before obtaining the corrected volumetric water content of the crude oil at each moment, the method further includes: obtaining the correction model;

[0025] The obtaining of the revised model comprises:

[0026] A function for obtaining a volumetric water content of water in the crude oil based on the sum of the volume fractions of the residual gas, the crude oil, and the water in the crude oil in the crude oil mixture as a constant;

[0027] According to the mass of the crude oil mixed liquid being the sum of the mass of the residual gas, the crude oil, and the water in the crude oil, obtaining a density function of the residual gas;

[0028] A correction model of the volumetric water content of water in the crude oil is obtained according to the function of the volumetric water content of water in the crude oil and the density function of the residual gas.

[0029] The present invention provides a correction device and method for the water content of crude oil, the device comprising: a temperature sensor, a pressure sensor, a density tester, a water content tester and a processing device; the temperature sensor, the pressure sensor, the density tester and the water content tester are respectively connected to the processing device for communication; the temperature sensor and the pressure sensor are arranged at one end of the crude oil pipeline close to the crude oil inlet; the water content tester is arranged at one end of the crude oil pipeline close to the crude oil outlet; the density tester is arranged in the middle of the crude oil pipeline. The correction device for the water content of crude oil provided by the present invention takes into account the influence of residual gas when obtaining the water content of crude oil, thereby improving the accuracy of the obtained water content of crude oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the connection of the device for correcting the water content of crude oil provided by the present invention;

[0031] Figure 2 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 1 ;

[0032] Figure 3 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 2 ;

[0033] Figure 4 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 3 ;

[0034] Figure 5 Schematic diagram of the process of the method for correcting the water content of crude oil provided by the present invention Figure 1 ;

[0035] Figure 6 Schematic diagram of the process of the method for correcting the water content of crude oil provided by the present invention Figure 2 ;

[0036] Figure 7 This is an application example of the method for correcting the water content of crude oil provided by the present invention.

[0037] Description of reference numerals:

[0038] 10- Correction device for water content of crude oil;

[0039] 11- Temperature sensor;

[0040] 12-pressure sensor;

[0041] 13-Density tester;

[0042] 14- Moisture content tester;

[0043] 15- Processing equipment;

[0044] 16-A / D converter;

[0045] 20-Crude oil pipeline. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Figure 1 This is a connection diagram of the crude oil water content correction device provided by the present invention, Figure 2 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 1 ;like Figure 1-2As shown, the crude oil water content correction device 10 provided in this embodiment includes: a temperature sensor 11, a pressure sensor 12, a density tester 13, a water content tester 14 and a processing device 15.

[0048] The crude oil water content correction device 10 provided in this embodiment is arranged on a crude oil pipeline 20. The crude oil in the crude oil pipeline 20 is crude oil after the gas therein is separated by a gas-liquid separator. There is still residual gas in the treated crude oil, and the crude oil contains a certain amount of water. The crude oil water content correction device 10 provided in this embodiment is to correct the water content in the crude oil.

[0049] Among them, the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 are respectively connected to the processing equipment 15 for communication. Specifically, the communication connection method can be a wired connection or a wireless connection. This embodiment does not limit the specific method of the communication connection, as long as the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 can send the collected relevant parameters of the crude oil to the processing equipment 15.

[0050] Specifically, the temperature sensor 11, pressure sensor 12, density tester 13, and water content tester 14 provided in this embodiment are all online testing equipment. By setting the temperature sensor 11, pressure sensor 12, density tester 13, and water content tester 14, each component can collect relevant parameters of crude oil in real time or periodically and send them to the processing equipment 15.

[0051] The temperature sensor 11 is used to collect the temperature of the residual gas in the crude oil at each moment, the pressure sensor 12 is used to collect the pressure of the residual gas in the crude oil at each moment, and the residual gas pressure is an absolute pressure. The density tester 13 is used to collect the mixed density of the crude oil mixture at each moment, that is, the mixed density of oil, gas and water in the crude oil; the water content tester 14 is used to collect the test volume water content of the crude oil at each moment.

[0052] like Figure 2 As shown, the temperature sensor 11 and the pressure sensor 12 are arranged at one end of the crude oil pipeline 20 close to the crude oil inlet; the temperature sensor 11 and the pressure sensor 12 in this embodiment are respectively used to collect the temperature and pressure of the residual gas in the crude oil. Since the temperature and pressure of the residual gas are used to obtain the density of the residual gas, the temperature sensor 11 and the pressure sensor 12 are arranged upstream of the crude oil pipeline 20. The flow rate of the crude oil just entering the crude oil pipeline 20 is faster, and the degree of separation of the oil, gas and water in the crude oil mixture is also greater than the separation degree at other positions of the crude oil pipeline 20, so that the density of the residual gas obtained is more accurate.

[0053] The water content tester 14 is arranged at one end of the crude oil pipeline 20 near the crude oil outlet; based on the same reason as above, the water content tester 14 is arranged at one end of the crude oil outlet of the crude oil pipeline 20, so that the water content in the obtained crude oil is more accurate; the density tester 13 is arranged in the middle of the crude oil pipeline 20. Compared with the crude oil flow rate at the crude oil inlet and outlet of the crude oil pipeline, the crude oil flow rate in the middle of the crude oil pipeline 20 is slower. At this time, the mixing degree of oil, gas and water in the crude oil mixture is also higher, so that the mixed density of the obtained crude oil mixture is more accurate.

[0054] After the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 send the temperature and pressure of the residual gas in the crude oil, the mixed density of the crude oil mixture, and the test volume water content in the crude oil collected at each moment to the processing equipment 15, the processing equipment 15 is used to obtain the density of the residual gas in the crude oil at each moment according to the temperature of the residual gas in the crude oil at each moment collected by the temperature sensor 11 and the pressure of the residual gas in the crude oil at each moment collected by the pressure sensor 12.

[0055] Specifically, according to the temperature and pressure of the residual gas, the specific method of obtaining the density of the residual gas can be obtained according to the natural gas density calculation formula provided in "Measuring Natural Gas Flow with Standard Orifice Flowmeter (GB / T 21446)". Due to the complexity of its derivation process, only the last formula is given in this embodiment, as shown in the following formula 1; for details, please refer to the above-mentioned "Measuring Natural Gas Flow with Standard Orifice Flowmeter (GB / T 21446)".

[0056]

[0057] Among them, ρ g Indicates the density of the gas in crude oil, Kg / m3; M g Indicates the relative molecular mass of the residual gas, Kg / Kg-mol; P g Represents the absolute pressure of the residual gas, MPa; Z represents the compressibility factor of the residual gas under actual working conditions; R represents the universal gas constant, usually 0.00831448 MPa·m3 / Kg-mol·K; T g represents the thermodynamic temperature of the residual gas, K.

[0058] The processing device 15 is used to obtain the density ρ of the crude oil based on the pre-stored crude oil test data. o , the density of water in crude oil ρ w ; Among them, the relevant parameters of crude oil can be obtained during the oil testing stage. In this embodiment, the density of crude oil and the density of water in crude oil are directly obtained based on the oil testing data.

[0059] The processing device 15 is also used to calculate the residual gas density ρ in the crude oil at each time. g , the density of crude oil, the density of water in crude oil, the mixed density of the crude oil mixture at each moment collected by the density tester 13 and the pre-stored correction model, the test volume water content of the crude oil at each moment collected by the water content tester 14 is corrected to obtain the corrected volume water content of the crude oil at each moment.

[0060] The correction model used in this embodiment can be shown in the following formula 2:

[0061]

[0062] Among them, ρ o represents the density of crude oil; ρ w Represents the density of water in crude oil; ρ s Represents the mixed density of crude oil mixture; η w Indicates the test volume water content of crude oil; f w Indicates the corrected volumetric water content of crude oil.

[0063] Specifically, the principle of the correction model can be as follows:

[0064] The crude oil mixture includes three components: oil, gas and water. Therefore, the sum of the volume fraction of residual gas in crude oil, the volume fraction of crude oil and the volume fraction of water in crude oil is a constant value of 1, which can be specifically shown in the following formula 3:

[0065] η w +η o +η g =1 Formula 3

[0066] Among them, η o represents the volume fraction of crude oil; η g It represents the volume fraction of residual gas in crude oil.

[0067] The mass of the crude oil mixture is the sum of the mass of the residual gas in the crude oil, the mass of the crude oil and the mass of the water in the crude oil, which can be specifically shown in the following formula 4:

[0068] ρ w η w +ρ o η o +ρ g η g =ρ s Formula 4

[0069] Among them, ρ s Represents the mixed density of crude oil mixture.

[0070] According to the concept of volumetric water content of crude oil, the corrected volumetric water content of crude oil can be expressed as the following formula 5:

[0071]

[0072] Among them, the corrected volumetric water content of crude oil is the ratio of the volume fraction of water in crude oil to the "sum of the volume fractions of crude oil and water in the crude oil mixture", and according to the above formula three, the "sum of the volume fractions of crude oil and water in the crude oil mixture" is converted into the difference between the constant 1 and the volume fraction of residual gas.

[0073] Combining Formula 4 and Formula 5, the volume fraction of residual gas in crude oil is expressed by the relevant parameters of crude oil and water in the crude oil mixture to obtain the corrected volume water content of crude oil as shown in Formula 6:

[0074]

[0075] After simplification, Formula 6 is finally obtained to obtain the corrected model of crude oil water content as shown in Formula 5.

[0076] The processing device 15 corrects the test volume water content of the crude oil at each moment collected by the water content tester according to the pre-stored correction model, as well as the density of the residual gas in the crude oil, the density of the crude oil, the density of the water in the crude oil, and the mixed density of the crude oil mixture at each moment, so as to obtain the corrected volume water content of the crude oil at each moment.

[0077] The crude oil water content correction device provided in this embodiment includes: a temperature sensor, a pressure sensor, a density tester, a water content tester and a processing device; the temperature sensor, the pressure sensor, the density tester and the water content tester are respectively connected to the processing device for communication; the temperature sensor and the pressure sensor are arranged at one end of the crude oil pipeline close to the crude oil inlet; the water content tester is arranged at one end of the crude oil pipeline close to the crude oil outlet; the density tester is arranged in the middle of the crude oil pipeline. The arrangement positions of the various components in the present invention make the crude oil parameters in the collection process more accurate, and make the corrected volume water content obtained more accurate; and the crude oil water content correction device provided in this embodiment, when obtaining the water content of the crude oil, takes into account the influence of residual gas, and further improves the accuracy of the obtained crude oil water content.

[0078] Combine the following Figure 3-Figure 4 The use scenario and structure of the crude oil water content correction device in this embodiment are described in more detail. Figure 3 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 2 , Figure 4 The structure of the crude oil water content correction device provided by the present invention is shown in FIG. Figure 3 ;like Figure 3-4As shown, the crude oil water content correction device provided in this embodiment can be applied to but not limited to crude oil pipelines that are straight or corner pipelines, wherein the corner pipelines include arc-shaped corner pipelines and broken-line corner pipelines.

[0079] Scenario 1:

[0080] like Figure 3 As shown, the crude oil pipeline 20 is a corner-type pipeline, and the temperature sensor 11, the pressure sensor 12, and the density tester 13 are respectively vertically arranged above the crude oil pipeline 20; the water content tester 14 is arranged parallel to the crude oil pipeline 20 at the corner of the crude oil pipeline 20. The setting positions of the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 are the same as those in the above embodiment, and this embodiment does not limit this.

[0081] Specifically, the water content tester 14 is also installed at the corner of the crude oil pipeline 20. Sealing gaskets are provided at the positions where the components on the crude oil pipeline 20 are installed. The size of the sealing gaskets is the same as the size of the probes of the components, so that the components can obtain more accurate relevant parameters of the crude oil.

[0082] In order to ensure the accuracy of each component in collecting various parameters in crude oil, the test probe of the temperature sensor 11, the test probe of the pressure sensor 12, the test probe of the density tester 13, and the test probe of the water content tester 14 are set below the liquid surface of the crude oil.

[0083] The test probes of the temperature sensor 11, the pressure sensor 12, and the density tester 13 are arranged in a direction perpendicular to the flow direction of the crude oil at the inlet of the crude oil pipeline 20; and the test probe of the water content tester 14 is arranged in a direction perpendicular to the flow direction of the crude oil at the outlet of the crude oil pipeline 20. The arrangement direction of the test probes of each component is arranged perpendicular to the flow direction of the crude oil, so that the parameters of the crude oil collected by the test probes of each component have higher accuracy, and also ensure the convenience of the operator during maintenance.

[0084] In order to further ensure the applicability of the parameters of the crude oil collected by each component, the test probe of the temperature sensor 11, the test probe of the pressure sensor 12, the test probe of the density tester 13, and the test probe of the water content tester 14 are set at the same height. That is, in this embodiment, the parameters of the crude oil collected by each component at each moment are the parameters of the same height liquid level.

[0085] Scenario 2:

[0086] like Figure 4As shown, the crude oil pipeline 20 is a straight pipeline, and the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 are respectively vertically arranged above the crude oil pipeline 20. The setting positions of the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 are the same as those in the above embodiment, and this embodiment does not limit this.

[0087] Specifically, the setting positions, directions and heights of the test probes of the temperature sensor 11, the pressure sensor 12, the density tester 13 and the moisture content tester 14 are the same as those in scenario 1 and are not elaborated here.

[0088] Furthermore, the crude oil water content correction device 10 provided in this embodiment also includes: an analog-to-digital A / D converter 16; wherein the temperature sensor 11, the pressure sensor 12, the density tester 13, and the water content tester 14 are respectively connected to the A / D converter 16, and the A / D converter 16 is connected to the processing equipment 15.

[0089] Since the temperature and pressure of the residual gas in the crude oil, the mixed density of the crude oil mixture and the test volume water content in the crude oil collected by the temperature sensor 11, the pressure sensor 12, the density tester 13 and the water content tester 14 are all analog data, the analog data is converted into digital data via the A / D converter 16 and processed and corrected by the processing device 15.

[0090] Optionally, the density tester 13 provided in this embodiment is an online density meter or a Coriolis mass flowmeter; the water content tester 14 is a short-wave crude oil water content meter; the processing device 15 is an intelligent instrument, an industrial computer or a digital selective calling DSC terminal, wherein the processing device 15 is preferably an industrial computer. The components in the crude oil water content correction device 10 provided in this embodiment are more environmentally friendly than the water content meters used in the prior art (such as γ-ray crude oil water content meters and x-ray crude oil water content meters).

[0091] In the crude oil water content correction device provided in this embodiment, the test probes of the temperature sensor, the pressure sensor, the density tester and the water content tester are arranged below the liquid surface of the crude oil; and the setting direction of the test probes of the temperature sensor, the pressure sensor and the density tester is perpendicular to the flow direction of the crude oil at the crude oil pipeline inlet; the setting direction of the test probe of the water content tester is perpendicular to the flow direction of the crude oil at the crude oil pipeline outlet; and the setting heights of the test probes are the same, which improves the accuracy of collecting various parameters in the crude oil, and when obtaining the water content of the crude oil, the influence of the residual gas is considered, thereby improving the accuracy of the obtained water content of the crude oil.

[0092] Combine the following Figure 5 The method for correcting the water content of crude oil provided in this embodiment is described. Figure 5 Schematic diagram of the process of the method for correcting the water content of crude oil provided by the present invention Figure 1 , Figure 5 The execution subject of the method shown is the processing equipment in the crude oil water content correction device. The method for correcting the crude oil water content provided in this embodiment includes:

[0093] S501, obtaining the density of the residual gas in the crude oil at each moment according to the temperature and pressure of the residual gas in the crude oil at each moment.

[0094] The processing equipment obtains the density of the residual gas in the crude oil at each moment according to the temperature of the residual gas in the crude oil at each moment collected by the temperature sensor and the pressure of the residual gas in the crude oil at each moment collected by the pressure sensor; wherein, the method for obtaining the density of the residual gas is the same as in the above embodiment and will not be repeated here.

[0095] S502, obtaining the density of the crude oil and the density of water in the crude oil according to the oil testing data of the crude oil.

[0096] The processing equipment may store in advance the oil testing data of the crude oil, and the density of the crude oil and the density of the water in the crude oil may be directly obtained based on the oil testing data.

[0097] S503, based on the density of residual gas in the crude oil at each moment, the density of the crude oil, the density of water in the crude oil, the mixed density of the crude oil mixture at each moment and a pre-stored correction model, the tested volume water content of the crude oil at each moment is corrected to obtain the corrected volume water content of the crude oil at each moment.

[0098] Specifically, the method of obtaining the correction model and the method of obtaining the corrected volumetric water content of crude oil at each moment are the same as those in the above embodiment, and will not be described in detail here.

[0099] In this embodiment, when obtaining the volumetric water content of crude oil, the influence of residual gas in the crude oil is taken into account, thereby improving the accuracy of the obtained water content of the crude oil.

[0100] Combine the following Figure 6 The method for correcting the water content of crude oil provided in this embodiment is described. Figure 6 Schematic diagram of the process of the method for correcting the water content of crude oil provided by the present invention Figure 2 The method for correcting the water content of crude oil provided in this embodiment includes:

[0101] S601, obtaining a revised model.

[0102] Specifically, the specific steps of obtaining the correction model may include: obtaining a function of the volumetric water content of water in the crude oil based on the sum of the volume fractions of residual gas, crude oil, and water in the crude oil in the crude oil mixture as a constant; that is, obtaining a function of the volumetric water content of water in the crude oil based on Formula 3 and Formula 5 in the above embodiment.

[0103] According to the mass of the crude oil mixture, the sum of the masses of the residual gas, crude oil, and water in the crude oil is the mass of the crude oil mixture, the density function of the residual gas is obtained; that is, the density function of the residual gas is obtained according to Formula 4 in the above embodiment.

[0104] According to the function of the volumetric water content of water in crude oil and the density function of the residual gas, a correction model of the volumetric water content of water in crude oil is obtained, that is, the correction model of the volumetric water content of water in crude oil is obtained according to Formula 4 and Formula 5 in the above embodiment.

[0105] For details on obtaining the correction model, reference may be made to the relevant description in the above embodiment, which will not be elaborated here.

[0106] S602, obtaining the density of the residual gas in the crude oil at each moment according to the temperature and pressure of the residual gas in the crude oil at each moment.

[0107] S603, obtaining the density of the crude oil and the density of water in the crude oil according to the oil testing data of the crude oil.

[0108] S604, based on the density of residual gas in the crude oil at each moment, the density of the crude oil, the density of water in the crude oil, the mixed density of the crude oil mixture at each moment and a pre-stored correction model, the tested volumetric water content of the crude oil at each moment is corrected to obtain the corrected volumetric water content of the crude oil at each moment.

[0109] Among them, S602-S604 can be specifically referred to the relevant description in the above embodiments S501-S503, and will not be elaborated here.

[0110] Combine the following Figure 7 The device and method for correcting the water content of crude oil provided in this embodiment are applied. Figure 7 The present invention provides an application example of the device and method for correcting the water content of crude oil provided by the present invention.

[0111] The specific application process is: 9 mixtures of kerosene and water with different volume water contents were experimentally configured and introduced into the crude oil pipeline respectively; among which, the volume water contents in the mixtures were 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% respectively.

[0112] At the inlet of the crude oil pipeline with each volumetric water content, nitrogen with different volumetric gas content is added, wherein the volumetric gas content of nitrogen is 0%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40% and 45% respectively; that is, 10 different nitrogens are introduced into the mixed liquid sample with each volumetric water content. In this application, a total of 90 sample results with different volumetric gas content are obtained.

[0113] Specifically, the temperature sensor is used to collect the temperature of nitrogen in the mixed liquid at each moment, the pressure sensor is used to collect the pressure of nitrogen in the mixed liquid at each moment, and the processing equipment is used to obtain the density of nitrogen in the mixed liquid at each moment according to the temperature and pressure of nitrogen; and the processing equipment pre-stores the density of the applied kerosene and water and the correction model provided by this embodiment.

[0114] The processing equipment is also used to correct the volumetric water content of the mixed liquid at each moment collected by the water content tester (i.e., 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90%) according to the density of nitrogen, the density of kerosene, the density of water, the mixed density of the crude oil mixture at each moment collected by the density tester and the correction model, so as to obtain the corrected crude oil volumetric water content of the oil-gas-water mixture.

[0115] Specifically, the corrected volumetric water content is as follows: Figure 7 As shown, the horizontal axis is the volumetric water content of the experimentally configured crude oil, and the vertical axis is the volumetric water content of the crude oil of the corrected oil-gas-water mixture at different volumetric gas contents.

[0116] It can be obtained through analysis that, using the device and method for correcting the water content of crude oil provided in this embodiment, when the gas content in the mixed liquid is less than 15%, the deviation between the corrected volume water content of the mixed liquid and the original volume water content falls within the error line of 3%; when the gas content is less than 25%, the deviation between the corrected volume water content of the mixed liquid and the original volume water content falls within the error line of 5%; when the gas content is in the range of 25% to 45%, the deviation between the corrected volume water content of the mixed liquid and the original volume water content all falls within the error line of 8%.

[0117] In summary, by using the device and method for correcting the water content of crude oil provided in this embodiment, the volume water content of the mixed liquid obtained has a smaller error and a higher accuracy.

[0118] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for correcting the water content of crude oil, characterized in that: include: Temperature sensors, pressure sensors, density testers, moisture content testers and processing equipment; The temperature sensor, pressure sensor, density tester, and moisture content tester are respectively connected to the processing equipment for communication; The temperature sensor and the pressure sensor are arranged at one end of the crude oil pipeline close to the crude oil inlet; the water content tester is arranged at one end of the crude oil pipeline close to the crude oil outlet; the density tester is arranged in the middle of the crude oil pipeline; The processing device is used to obtain the density of the residual gas in the crude oil at each moment according to the temperature of the residual gas in the crude oil at each moment collected by the temperature sensor and the pressure of the residual gas in the crude oil at each moment collected by the pressure sensor; The processing device is used to obtain the density of oil in the crude oil and the density of water in the crude oil according to the pre-stored oil testing data of the crude oil; The processing equipment is also used to correct the test volume water content of the crude oil at each moment collected by the water content tester according to the density of the residual gas in the crude oil at each moment, the density of oil in the crude oil, the density of water in the crude oil, the mixed density of the crude oil at each moment collected by the density tester and a pre-stored correction model, so as to obtain the corrected volume water content of the crude oil at each moment.

2. The correction device according to claim 1, characterized in that The crude oil pipeline is a corner-type pipeline, and the temperature sensor, pressure sensor, and density tester are respectively vertically arranged above the crude oil pipeline; the water content tester is arranged parallel to the crude oil pipeline at the corner of the crude oil pipeline.

3. The correction device according to claim 1, characterized in that The crude oil pipeline is a straight pipeline, and the temperature sensor, pressure sensor, density tester, and water content tester are respectively vertically arranged above the crude oil pipeline.

4. The correction device according to claim 2 or 3, characterized in that: The test probe of the temperature sensor, the test probe of the pressure sensor, the test probe of the density tester, and the test probe of the water content tester are arranged below the liquid surface of the crude oil.

5. The correction device according to claim 4, characterized in that: The test probe of the temperature sensor, the test probe of the pressure sensor, and the test probe of the density tester are arranged in a direction perpendicular to the flow direction of the crude oil at the inlet of the crude oil pipeline; The setting direction of the test probe of the water content tester is perpendicular to the flow direction of the crude oil at the outlet of the crude oil pipeline.

6. The correction device according to claim 5, characterized in that The test probe of the temperature sensor, the test probe of the pressure sensor, the test probe of the density tester, and the test probe of the moisture content tester are arranged at the same height.

7. The correction device according to claim 1, characterized in that The correction device also includes: an analog-to-digital A / D converter, the temperature sensor, pressure sensor, density tester, and moisture content tester are respectively connected to the A / D converter, and the A / D converter is connected to the processing equipment.

8. The correction device according to claim 1, characterized in that The processing device is an intelligent meter, an industrial computer or a digital selective calling DSC terminal.

9. A method for correcting the water content of crude oil, characterized in that: include: According to the temperature and pressure of the residual gas in the crude oil at each moment, obtaining the density of the residual gas in the crude oil at each moment; According to the oil testing data of the crude oil, the density of the oil in the crude oil and the density of the water in the crude oil are obtained; According to the density of the residual gas in the crude oil at each moment, the density of the oil in the crude oil, the density of the water in the crude oil, the mixed density of the crude oil at each moment and a pre-stored correction model, the tested volume water content of the crude oil at each moment is corrected to obtain the corrected volume water content of the crude oil at each moment.

10. The correction method according to claim 9, characterized in that: Before obtaining the corrected volumetric water content of the crude oil at each moment, the method further includes: obtaining the correction model; The obtaining of the revised model comprises: A function for obtaining a volumetric water content of water in the crude oil based on the sum of the volume fractions of the residual gas, the oil and the water in the crude oil being a constant; According to the sum of the masses of the residual gas, the oil, and the water in the crude oil being the mass of the crude oil, obtaining a density function of the residual gas; A correction model of the volumetric water content of water in the crude oil is obtained according to the function of the volumetric water content of water in the crude oil and the density function of the residual gas.

11. A device for correcting the water content of crude oil, characterized in that: include: Memory for storing computer programs; A processor, configured to execute the computer program to implement the method according to claim 9 or 10.

12. A computer-readable storage medium, characterized in that: A computer program is stored thereon; When the computer program is executed by a processor, the method according to claim 9 or 10 is implemented.

13. A computer program product comprising: A computer program, characterized in that when the computer program is executed by a processor, it is used to implement the method according to claim 9 or 10.

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