Mobile metering pry and metering method

Abstract

The invention discloses a mobile metering pry and a metering method, the mobile metering pry comprises an input pipeline, the input pipeline is used for inputting a to-be-measured medium, the input pipeline is connected with a gas-liquid coarse separation device, the gas-liquid coarse separation device is used for performing gas-liquid coarse separation on the to-be-measured medium, and the top of the gas-liquid coarse separation device is connected with a gas path pipeline; the bottom of the gas-liquid coarse separation device is connected with a liquid path pipeline, the gas path pipeline is provided with a first mixed-phase flowmeter, the liquid path pipeline is provided with a second mixed-phase flowmeter, and the first mixed-phase flowmeter and the second mixed-phase flowmeter are both used for detecting the mass flow of each phase of gas and liquid; and the other end of the gas path pipeline and the other end of the liquid path pipeline are converged and are simultaneously connected with an output pipeline. The device has the advantage that the flow of each phase can be accurately measured on the premise that the gas phase and the liquid phase are not completely separated.

Description

Technical Field

[0001] The present application relates to the technical field of mass flow measurement, and in particular to a mobile metering skid and a metering method. Background Art

[0002] In the field of oil and gas extraction, crude oil metering is an important link in oilfield production. As an oil production company, accurately grasping the oil well production and timely grasping and analyzing the oil well production conditions according to the changes in production are the fundamental goals of oil well metering. Therefore, oil well metering is of great significance to improving the level of oil well management.

[0003] During the oil well metering process, the liquid from the oil well is mostly in a three-phase mode of oil, water and gas. The traditional method separates the three phases of oil, gas and water and then measures the gas-liquid flow rate. There are problems such as large separation tank volume, large equipment footprint, incomplete separation efficiency, and low measurement accuracy. Therefore, it is difficult for existing metering instruments to accurately measure the flow of each phase under the premise that the gas and liquid phases are not completely separated. Traditional volumetric metering has been unable to meet on-site usage requirements. Summary of the invention

[0004] The main purpose of the present application is to provide a mobile metering skid and a metering method, aiming to solve the technical problem that existing metering instruments are difficult to accurately measure the flow of each phase under the premise that the gas and liquid phases are not completely separated.

[0005] To achieve the above-mentioned purpose, the present application provides a mobile metering skid, including an input pipeline, the input pipeline is used to input the medium to be measured, the input pipeline is connected to a gas-liquid coarse separation device, the gas-liquid coarse separation device is used to perform gas-liquid coarse separation on the medium to be measured, the top of the gas-liquid coarse separation device is connected to an air pipeline, the bottom of the gas-liquid coarse separation device is connected to a liquid pipeline, a first mixed-phase flowmeter is arranged on the air pipeline, and a second mixed-phase flowmeter is arranged on the liquid pipeline, the first mixed-phase flowmeter and the second mixed-phase flowmeter are both used to detect the mass flow rate of each phase of the gas and liquid, and the other ends of the air pipeline and the liquid pipeline merge and are connected to an output pipeline at the same time.

[0006] Optionally, a water content meter is also provided on the liquid pipeline, and the water content meter is located between the gas-liquid coarse separation device and the second mixed phase flow meter.

[0007] Optionally, a total flow meter is provided on the input pipeline, and the total flow meter is used to measure the mass flow of each phase of the gas-liquid two-phase medium in the medium to be measured.

[0008] Optionally, the gas pipeline includes a first gas pipe and a second gas pipe, both of which can be connected to the gas-liquid coarse separation device, a first mixed-phase flow meter is provided on the first gas pipe and the second gas pipe, and the flow measurement ranges of the two first mixed-phase flow meters are different, and a first control valve is provided on the first gas pipe and the second gas pipe, and the first control valve is located between the first mixed-phase flow meter and the gas-liquid coarse separation device.

[0009] Optionally, the liquid pipeline includes a first liquid pipe and a second liquid pipe, both of which can be connected to the gas-liquid coarse separation device, and a second mixed-phase flow meter is arranged on the first liquid pipe and the second liquid pipe, and the flow measurement ranges of the two second mixed-phase flow meters are different. A second control valve is arranged on the first liquid pipe and the second liquid pipe, and the second control valve is located between the second mixed-phase flow meter and the gas-liquid coarse separation device.

[0010] To achieve the above object, the present application also provides a metering method, based on the above mobile metering skid, comprising the following steps: The medium to be measured is roughly divided into a gas phase medium and a liquid phase medium by a gas-liquid rough separation device; wherein the gas phase medium is a medium separated from the medium to be measured and having a gas content greater than a first preset value, and the liquid phase medium is a medium separated from the medium to be measured and having a gas content less than a second preset value; According to the first mixed phase flowmeter, the gas mass flow rate of the gas phase medium flowing through the gas pipeline is obtained. Q g1 Liquid mass flow Q l1 ; According to the second mixed phase flowmeter, the gas mass flow rate of the liquid medium flowing through the liquid pipeline is obtained. Q g2 Liquid mass flow Q l2 ; Get the total gas mass flow rate of the medium to be measured Q g and total liquid mass flow Q l ;in, Q g = Q g1 + Q g2 , Q l = Q l1 + Q l2 .

[0011] Optionally, the gas mass flow rate Q g1 Gas mass flow Q g2 The expressions of are: Q mg =Q m *（1-f ml ） ; Liquid mass flow Ql1 Liquid mass flow Q l2 The expressions of are: Q ml =Q m *f ml ; In the formula, Q mg is the gas mass flow rate, Q ml is the liquid mass flow rate, Q m is the total mass flow rate of the gas phase medium or the liquid phase medium, f ml It is the liquid mass content of the gas phase medium or liquid phase medium.

[0012] Optionally, the total mass flow Q m The expression is:

[0013] In the formula, Δ p is the differential pressure value measured by the differential pressure transmitter in the first mixed phase flow meter or the second mixed phase flow meter, r mix is the mixed density of gaseous medium or liquid medium, K is the system parameter; Mixed Density r mix The expression is: r mix = f ( F 2 ( x k ), oh ); In the formula, F ( x k ) is the dimensionless vibration mode function of the vibrating tube in the first mixed phase flow meter or the second mixed phase flow meter, oh It is the resonant frequency when gas or liquid medium is passed into the resonance tube.

[0014] Optionally, the liquid mass liquid content f ml The expression is:

[0015] In the formula, r l is the liquid density, r gS is the gas density of natural gas working condition.

[0016] Optionally, obtain the total gas mass flow rate of the medium to be measured Q g and total liquid mass flow Q l After that, it also includes: Identify whether the liquid medium is oil-water two-phase; If not, then end; If yes, then the water content of the liquid medium is obtained based on the water content meter WC ; According to moisture content WC , respectively obtain the total water mass flow rate in the liquid medium Q w and total oil mass flow Q o ;in, Q w = Q l * WC , Q o = Q l * (1- WC ).

[0017] The beneficial effects that this application can achieve are as follows: The present application includes an input pipeline, which is used to input the medium to be tested. The input pipeline is connected to a gas-liquid rough separation device, which is used to perform gas-liquid rough separation on the medium to be tested. The top of the gas-liquid rough separation device is connected to an air pipeline, and the bottom of the gas-liquid rough separation device is connected to a liquid pipeline. A first mixed-phase flowmeter is arranged on the air pipeline, and a second mixed-phase flowmeter is arranged on the liquid pipeline. The first mixed-phase flowmeter and the second mixed-phase flowmeter are both used to detect the mass flow rate of each phase of the gas and liquid. The other ends of the air pipeline and the liquid pipeline merge and are connected to an output pipeline at the same time. Based on the metering skid of the present application, after the medium to be measured enters the gas-liquid coarse separation device through the input pipeline, the medium to be measured can be subjected to gas-liquid coarse separation to obtain gas phase medium and liquid phase medium respectively, but the gas-liquid two-phase medium is not completely separated, the gas phase medium contains a small amount of liquid, and the liquid phase medium also contains a small amount of gas, so the gas phase medium and the liquid phase medium enter the gas pipeline and the liquid pipeline respectively, and the mass flow rate of the gas and liquid phases in each pipeline is detected by the first mixed-phase flowmeter and the second mixed-phase flowmeter respectively, so that the gas mass flow rate measured in the gas pipeline and the liquid pipeline respectively is added to obtain the total gas mass flow rate, and the liquid mass flow rate measured in the gas pipeline and the liquid pipeline respectively is added to obtain the total liquid mass flow rate, and the measured gas phase medium and liquid phase medium are finally merged and discharged from the output pipeline, thereby realizing accurate measurement of the flow rate of each phase under the premise that the gas and liquid phases are not completely separated, and reducing the measurement difficulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0019] Figure 1 This is a schematic diagram of the structure of a mobile metering skid in an embodiment of the present application; Figure 2 This is a schematic diagram of the working principle of a mobile metering skid in an embodiment of the present application.

[0020] Reference numerals: 110-input pipeline, 120-gas-liquid rough separation device, 130-gas pipeline, 131-first gas pipeline, 132-second gas pipeline, 140-liquid pipeline, 141-first liquid pipeline, 142-second liquid pipeline, 150-first mixed-phase flowmeter, 160-second mixed-phase flowmeter, 170-output pipeline, 180-total flowmeter, 190-first control valve, 210-second control valve.

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0023] It should be noted that all directional indications in the embodiments of the present application (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0024] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0025] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0026] Example 1 Reference Figure 1-Figure 2The present embodiment provides a mobile metering skid, including an input pipeline 110, the input pipeline 110 is used to input a medium to be measured, the input pipeline 110 is connected to a gas-liquid rough separation device 120, the gas-liquid rough separation device 120 is used to perform gas-liquid rough separation on the medium to be measured, the top of the gas-liquid rough separation device 120 is connected to an air pipeline 130, the bottom of the gas-liquid rough separation device 120 is connected to a liquid pipeline 140, a first mixed-phase flowmeter 150 is arranged on the air pipeline 130, and a second mixed-phase flowmeter 160 is arranged on the liquid pipeline 140, the first mixed-phase flowmeter 150 and the second mixed-phase flowmeter 160 are both used to detect the mass flow rate of each phase of the gas and liquid, and the other ends of the air pipeline 130 and the liquid pipeline 140 are merged and connected to an output pipeline 170 at the same time.

[0027] In the present embodiment, after the medium to be measured (including gas and liquid phases) enters the gas-liquid rough separation device 120 through the input pipeline 110, the medium to be measured is subjected to gas-liquid rough separation to obtain gas phase medium and liquid phase medium respectively. However, the gas-liquid two-phase medium is not completely separated, and the gas phase medium contains a small amount of liquid, and the liquid phase medium also contains a small amount of gas. Therefore, the gas phase medium and the liquid phase medium enter the gas pipeline 130 and the liquid pipeline 140 respectively, and the mass flow rates of the gas and liquid phases in each pipeline are detected by the first mixed phase flowmeter 150 and the second mixed phase flowmeter 160 respectively, so that the gas mass flow rates measured in the gas pipeline 130 and the liquid pipeline 140 are added to obtain the total gas mass flow rate, and the liquid mass flow rates measured in the gas pipeline 130 and the liquid pipeline 140 are added to obtain the total liquid mass flow rate. The measured gas phase medium and liquid phase medium are finally merged and discharged from the output pipeline 170, thereby realizing accurate measurement of the flow rates of each phase under the premise that the gas and liquid phases are not completely separated, and reducing the measurement difficulty. In summary, compared with the liquid storage area in the traditional separation mode, the liquid storage area designed in this embodiment occupies a smaller area and has a lower cost.

[0028] It should be noted that the gas-liquid rough separation device 120 can be a separator with a gas-liquid vertical cyclone structure. The centrifugal force, gravity and buoyancy inside the separator work together to form an inverted cone vortex field. In this vortex field, the gas phase medium with lower density rises to the top of the separator along the center of the vortex, while the liquid phase medium with higher density flows along the vertical pipe wall into the liquid storage area at the bottom of the separator. Secondary sedimentation separation can be performed in the liquid storage area. The gas-liquid rough separation device 120 is provided with a regulating valve. Based on the regulating valve, the liquid level in the liquid storage area can be maintained at the same liquid level and the liquid level can be kept constant, thereby ensuring that the test flow rate is the flow rate under the actual working conditions and reducing the metering error. Therefore, the liquid storage area can perform secondary sedimentation on the liquid phase medium and perform secondary separation on the incompletely separated gas-liquid medium. The gas-liquid rough separation device 120 can also be a collision separator, which uses a partition for collision separation (the above two separators are both prior art and will not be repeated here). Both the first mixed-phase flowmeter 150 and the second mixed-phase flowmeter 160 can adopt the existing patent with patent application number "201910290355.1" and name "Wet gas flowmeter based on resonance and differential pressure measurement" to detect the mass flow of gas-liquid two-phase medium. The first mixed-phase flowmeter 150 of the top pipeline (i.e., the gas pipeline 130) is applicable to high-gas-containing media with GVF (volume gas content)>95%, and the second mixed-phase flowmeter 160 of the bottom pipeline (i.e., the liquid pipeline 140) is applicable to low-gas-containing media with GVF between 0 and 30%.

[0029] As an optional implementation, a water content meter (ie, a water content analyzer) is also provided on the liquid pipeline 140 , and the water content meter is located between the gas-liquid rough separation device 120 and the second mixed phase flow meter 160 .

[0030] In this embodiment, if the separated liquid medium is oil and water, the flow rate of each phase of oil and water can be measured by the water content meter, thereby obtaining the three-phase flow rate of oil, gas and water. Therefore, this embodiment has the function of three-phase flow measurement and can meet more complex working conditions. Therefore, this embodiment integrates the first mixed phase flow meter 150, the second mixed phase flow meter 160, the water content meter, etc. into a skid, which has a high degree of integration and a wider range of applicable scenarios. When an oil well is mined, the skid can be directly recycled to the next wellhead for recycling.

[0031] As an optional embodiment, a total flow meter 180 is provided on the input pipeline 110, and the total flow meter 180 is used to measure the mass flow of each phase of the gas-liquid two-phase medium in the medium to be measured. The liquid phase flow of the medium to be measured can be measured by the total flow meter 180, so that the measured flow of each phase can be compared with the measurement data of the total flow meter 180 to obtain the separation efficiency. or , or = Q l / Q tl ,Q l is the liquid phase flow rate measured in the liquid pipeline 140, Q tl It is the liquid phase flow rate measured by the total meter. According to the test, the separation efficiency of the metering skid of this embodiment is about 90%.

[0032] It should be noted that the total flowmeter 180 can adopt the existing patent with patent application number "202410565241.4" and name "Mixed-phase fluid mass flow measurement method and throttling photon mixed-phase flowmeter", so as to realize the detection of the mass flow of each phase of the gas-liquid two-phase medium in the measured medium.

[0033] As an optional embodiment, the gas circuit pipeline 130 includes a first gas circuit pipe 131 and a second gas circuit pipe 132, both of which can be connected to the gas-liquid coarse separation device 120, and a first mixed-phase flow meter 150 is provided on the first gas circuit pipe 131 and the second gas circuit pipe 132, and the flow measurement ranges of the two first mixed-phase flow meters 150 are different. The first gas circuit pipe 131 and the second gas circuit pipe 132 are both provided with a first control valve 190, and the first control valve 190 is located between the first mixed-phase flow meter 150 and the gas-liquid coarse separation device 120. The liquid pipeline 140 includes a first liquid pipe 141 and a second liquid pipe 142, both of which can be connected to the gas-liquid rough separation device. A second mixed-phase flowmeter 160 is provided on the first liquid pipe 141 and the second liquid pipe 142, and the flow measurement ranges of the two second mixed-phase flowmeters 160 are different. A second control valve 210 is provided on the first liquid pipe 141 and the second liquid pipe 142, and the second control valve 210 is located between the second mixed-phase flowmeter 160 and the gas-liquid rough separation device 120.

[0034] In this embodiment, the gas pipeline 130 and the liquid pipeline 140 can be divided into two paths. According to the actual situation of the measured flow, different measurement pipelines can be entered for measurement, so that the corresponding first control valve 190 or the second control valve 210 can be opened for the medium with different flow rates, so as to select the first mixed phase flowmeter 150 or the second mixed phase flowmeter 160 with the corresponding flow measurement range, which is more targeted and further improves the measurement accuracy. For example, the two first mixed phase flowmeters 150 can respectively use a DN25 standard gas meter and a DN50 standard gas meter. The measurement range of the DN25 standard gas meter is 4100m 3 / d~50000m 3 / d, the measuring range of DN50 standard gas meter is 50000m 3 / d~300000m 3 / d, the two second mixed phase flow meters 160 can use DN25 standard liquid meter and DN50 standard liquid meter respectively, and the measurement range of DN25 standard liquid meter is 1m 3 / d~72m 3 / d, the measuring range of DN50 standard liquid meter is 72m 3 / d~240m 3 / d. In summary, the flow measurement range that this metering skid can achieve is: single gas 4100m 3 / d~300000m 3 / d, single liquid 1m 3 / d~240m 3 / d.

[0035] It should be noted that in order to verify the working efficiency of the gas-liquid rough separation device 120, the upper computer software can be used to compare and analyze the working gas density of the mixed density meter and the mixed density difference of the flow meter, which is helpful to timely discover and adjust the working state of the gas-liquid rough separation device 120, and provide accurate basic data for subsequent measurements. This metering skid can adopt two power supply methods, the main power supply is solar DC24V, and the backup power supply is AC220V. In summary, the mobile metering skid of this embodiment has high measurement accuracy, gas phase measurement accuracy ±2%, liquid phase measurement accuracy ±2%, water content measurement accuracy ±2%, which meets the application requirements of most oil and gas fields and provides reliable technical support for the metering of oil well production.

[0036] Example 2 Reference Figure 1-Figure 2 This embodiment provides a metering method, based on the above-mentioned mobile metering skid, comprising the following steps: The medium to be tested is roughly divided into a gas phase medium and a liquid phase medium by the gas-liquid rough separation device 120; wherein the gas phase medium is a medium separated from the medium to be tested and the gas content is greater than a first preset value (for example, 95%), and the liquid phase medium is a medium separated from the medium to be tested and the gas content is less than a second preset value (for example, 30%); According to the first mixed phase flowmeter 150, the gas mass flow rate of the gas phase medium flowing through the gas pipeline 130 is obtained. Q g1 Liquid mass flow Q l1 ; According to the second mixed phase flow meter 160, the gas mass flow rate of the liquid medium flowing through the liquid pipeline 140 is obtained. Q g2 Liquid mass flow Q l2 ; Get the total gas mass flow rate of the medium to be measured Q g and total liquid mass flow Q l ;in, Q g = Q g1 + Qg2 , Q l = Q l1 + Q l2 . In this embodiment, the medium to be tested is roughly separated by the gas-liquid rough separation device 120 to obtain a gas phase medium and a liquid phase medium, respectively. The gas phase medium enters the gas pipeline 130, and the liquid phase medium enters the liquid pipeline 140. Then, the gas mass flow rate of the gas phase medium is detected by the first mixed phase flowmeter 150. Q g1 Liquid mass flow Q l1 , the gas mass flow rate of the liquid medium is detected by the second mixed phase flow meter 160 Q g2 Liquid mass flow Q l2 , thereby converting the gas mass flow rates measured in the gas pipeline 130 and the liquid pipeline 140 into Q g1 and Q g2 Add together to get the total gas mass flow Q g , the liquid mass flow rates measured in the gas pipeline 130 and the liquid pipeline 140 are Q l1 and Q l2 Add together to get the total liquid mass flow rate Q l , thereby achieving accurate measurement of the flow rate of each phase under the premise that the gas and liquid phases are not completely separated, and reducing the difficulty of measurement.

[0037] As an optional implementation, the gas mass flow rate Q g1 Gas mass flow Q g2 The expressions of are: Q mg =Q m *（1-f ml ） ; Liquid mass flow Q l1 Liquid mass flow Q l2 The expressions of are: Q ml =Q m *fml ; In the formula, Q mg is the gas mass flow rate, Q ml is the liquid mass flow rate, Q m is the total mass flow rate of the gas phase medium or the liquid phase medium, f ml It is the liquid mass content of the gas phase medium or liquid phase medium.

[0038] In this embodiment, the total gas mass flow rate is calculated Q g Based on the above Q mg The gas mass flow rate is calculated by the expression Q g1 and Q g2 The sum of the two is the total gas mass flow rate Q g , similarly, based on the above Q ml The liquid mass flow rate is calculated by the expression Q l1 and Q l2 The sum of the two is the total liquid mass flow rate Q l , the calculation is reliable and accurate.

[0039] As an optional embodiment, the total mass flow Q m The expression is:

[0040] In the formula, Δ p is the differential pressure value measured by the differential pressure transmitter in the first mixed phase flow meter or the second mixed phase flow meter, r mix is the mixed density of gaseous medium or liquid medium, K is the system parameter; Mixed Density r mix The expression is: r mix = f ( F 2 ( x k ), oh ); In the formula, F ( xk ) is the dimensionless vibration mode function of the vibrating tube in the first mixed phase flow meter or the second mixed phase flow meter, oh It is the resonant frequency when gas or liquid medium is passed into the resonance tube.

[0041] In this embodiment, the above formula takes into account various parameters and correlations in the first mixed phase flow meter 150 and the second mixed phase flow meter 160 that may affect the accuracy of flow calculation, thereby constructing a method that can accurately calculate the total mass flow rate. Q m The expression of further improves the accuracy of the calculation of mass flow rate of each phase.

[0042] As an optional embodiment, the liquid content by mass f ml The expression is:

[0043] In the formula, r l is the liquid density, r gS is the gas density of natural gas working condition.

[0044] As an optional implementation, the total gas mass flow rate of the medium to be measured is obtained Q g and total liquid mass flow Q l After that, it also includes: Identify whether the liquid medium is oil-water two-phase; If not, then end; If yes, then the water content of the liquid medium is obtained based on the water content meter WC ;in, WC = dw / ( d 0+ dw ), dw is the thickness of water in the throat of the water meter, d 0 is the thickness of the oil body in the throat of the water content meter; According to moisture content WC , respectively obtain the total water mass flow rate in the liquid medium Q w and total oil mass flow Q o ;in, Q w = Q l * WC , Q o = Q l * (1- WC).

[0045] In this embodiment, for the case where the liquid phase medium is a two-phase oil-water medium, the water content of the liquid phase medium can be obtained based on the water content meter. WC , so the total water mass flow rate can be calculated based on the above formula Q w and total oil mass flow Q o , realizing oil, gas and water three-phase flow measurement.

[0046] It should be noted that when calculating the moisture content, the following formula can be used as a reference:

[0047] d 0 +d w =d ; In the formula, m w31 It is the absorption coefficient of water at 31keV, factory calibrated; m o31 Absorption coefficient of oil at 31keV, factory calibrated; N 031 The count is 31keV under standard conditions with empty pipe, factory calibrated; N 31 Real-time counting of mixed media at 31keV; d is the throat diameter in the water content meter. It should be noted that the water content can also be measured at the 81keV energy level. m w31 Can be replaced by m w81 , which is the absorption coefficient of water at 81keV, m o31 Can be replaced by m o81 , which is the absorption coefficient of oil at 81keV, N 031 Can be replaced by N 081 , which is the count of 81keV when the tube is empty under standard conditions, N 31 Can be replaced by N 81 , which is the real-time count of the mixed medium at 81keV.

[0048] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A mobile metering skid, It is characterized in that It includes an input pipeline, the input pipeline is used to input the medium to be tested, the input pipeline is connected to a gas-liquid rough separation device, the gas-liquid rough separation device is used to perform gas-liquid rough separation on the medium to be tested, the top of the gas-liquid rough separation device is connected to an air pipeline, the bottom of the gas-liquid rough separation device is connected to a liquid pipeline, the air pipeline is provided with a first mixed-phase flowmeter, the liquid pipeline is provided with a second mixed-phase flowmeter, the first mixed-phase flowmeter and the second mixed-phase flowmeter are both used to detect the mass flow rate of each phase of the gas and liquid, and the other ends of the air pipeline and the liquid pipeline merge and are connected to an output pipeline at the same time.

2. A mobile metering skid as claimed in claim 1, It is characterized in that The liquid pipeline is also provided with a water content meter, and the water content meter is located between the gas-liquid rough separation device and the second mixed phase flow meter.

3. A mobile metering skid as claimed in claim 2, It is characterized in that The input pipeline is provided with a total flow meter, and the total flow meter is used to measure the mass flow of each phase of the gas-liquid two-phase medium in the medium to be measured.

4. A mobile metering skid as claimed in claim 2, It is characterized in that The gas pipeline includes a first gas pipe and a second gas pipe, both of which can be connected to the gas-liquid rough separation device. The first mixed-phase flowmeter is arranged on the first gas pipe and the second gas pipe, and the flow measurement ranges of the two first mixed-phase flowmeters are different. The first gas pipe and the second gas pipe are provided with a first control valve, and the first control valve is located between the first mixed-phase flowmeter and the gas-liquid rough separation device.

5. A mobile metering skid as claimed in claim 2, It is characterized in that The liquid pipeline includes a first liquid pipe and a second liquid pipe, both of which are connected to the gas-liquid rough separation device. The second mixed-phase flowmeter is arranged on the first liquid pipe and the second liquid pipe, and the flow measurement ranges of the two second mixed-phase flowmeters are different. The first liquid pipe and the second liquid pipe are provided with a second control valve, and the second control valve is located between the second mixed-phase flowmeter and the gas-liquid rough separation device.

6. A measurement method, It is characterized in that A mobile metering skid according to any one of claims 2 to 5, comprising the following steps: The medium to be measured is roughly divided into a gas phase medium and a liquid phase medium by the gas-liquid rough separation device; wherein the gas phase medium is a medium separated from the medium to be measured and having a gas content greater than a first preset value, and the liquid phase medium is a medium separated from the medium to be measured and having a gas content less than a second preset value; According to the first mixed-phase flowmeter, the gas mass flow rate of the gas phase medium flowing through the gas pipeline is obtained. Q g1 Liquid mass flow Q l1 ; According to the second mixed phase flowmeter, the gas mass flow rate of the liquid phase medium flowing through the liquid pipeline is obtained. Q g2 Liquid mass flow Q l2 ; Obtain the total gas mass flow rate of the medium to be measured Q g and total liquid mass flow Q l ;in, Q g = Q g1 + Q g2 , Q l = Q l1 + Q l2 .

7. A measuring method as claimed in claim 6, It is characterized in that The gas mass flow rate Q g1 and the gas mass flow rate Q g2 The expressions of are: Q mg =Q m *（1-f ml ） ； The liquid mass flow rate Q l1 and the liquid mass flow rate Q l2 The expressions of are: Q ml =Q m *f ml ； In the formula, Q mg is the gas mass flow rate, Q ml is the liquid mass flow rate, Q m is the total mass flow rate of the gas phase medium or the liquid phase medium, f ml is the liquid mass content of the gas phase medium or the liquid phase medium.

8. A measuring method as claimed in claim 7, It is characterized in that The total mass flow Q m The expression is: In the formula, Δ p is the differential pressure value measured by the differential pressure transmitter in the first mixed-phase flowmeter or the second mixed-phase flowmeter, ρ mix is the mixed density of the gas phase medium or the liquid phase medium, K is the system parameter; The mixed density ρ mix The expression is: ρ mix = f ( Φ 2 ( x k ), ω ); In the formula, Φ ( x k ) is a dimensionless vibration mode function of the vibrating tube in the first mixed phase flow meter or the second mixed phase flow meter, ω It is the resonance frequency when the gas phase medium or the liquid phase medium is introduced into the resonance tube.

9. A measuring method as claimed in claim 8, It is characterized in that The liquid mass liquid content f ml The expression is: In the formula, ρ l is the liquid density, ρ gS is the gas density of natural gas working condition.

10. A measuring method according to claim 6, It is characterized in that The method of obtaining the total gas mass flow rate of the medium to be measured Q g and total liquid mass flow Q l After that, it also includes: Identify whether the liquid medium is oil-water two-phase; If not, then end; If yes, then the water content of the liquid medium is obtained based on the water content meter WC ; According to the moisture content WC , respectively obtain the total water mass flow rate in the liquid medium Q w and total oil mass flow Q o ;in, Q w = Q l * WC , Q o = Q l * (1- WC ).

Images