Device and method for measuring flow pattern and moisture content based on orthogonal microwave bimodal

Abstract

The invention discloses a flow pattern and water content measuring device and method based on orthogonal microwave bimodal, and is applied to the field of crude oil and natural gas engineering. According to the invention, a conformal antenna array unit (mode 1) and an orthogonal microwave transmission line unit (mode 2) are creatively fused, and a bimodal microwave sensor with a dual complementary orthogonal microwave field is constructed, so that measurement of two parameters of flow pattern and moisture content is realized. Aiming at two typical flow patterns of stratified flow and annular flow, change characteristics of microwave amplitude signals of vertical and horizontal antenna pairs in the first mode and change characteristics of phase signals of vertical and horizontal transmission lines in the second mode with the flow pattern and the water content are analyzed, a flow pattern identification method is provided, and a water content measurement model is constructed. According to the method, the change conditions of the flow pattern and the moisture content of the two-phase flow can be predicted in real time on line with high precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of multiphase flow detection, and relates to a flow pattern and water cut measurement device and method based on orthogonal microwave dual modes. Background Art

[0002] During the exploitation and transportation of crude oil / natural gas, due to the influence of oil / gas reservoir structures and pipeline terrain conditions, the flow patterns of two-phase flows are complex. Additionally, due to the influence of the geological structures of oil / gas wells in different regions and the injection of water or steam during secondary recovery, problems such as salinity changes occur, posing a huge challenge to the accurate real-time monitoring technology of oil-water / gas-water two-phase flow parameters, and there is an urgent need for effective solutions.

[0003] Currently, the techniques for online predicting the flow patterns and water cuts of two-phase flows include the conductivity method, ultrasonic method, ray method, capacitance method, microwave method, etc. Among them, the two-phase flow pattern and water cut measurement technology based on the microwave method has gradually become one of the most promising and potential solutions in the oil and gas industry. This method is based on the physical property characteristics that the dielectric constant values of water and other fluids (such as crude oil, natural gas, etc.) differ greatly to predict the changes in flow patterns and water cuts. Although it has been applied in the oil and gas industry, there are still many problems. The main technical bottleneck is that it is difficult for the microwave method to accurately measure the water content of high-salinity full-range multi-flow pattern two-phase flows. Summary of the Invention

[0004] The purpose of the present invention is to provide a new two-phase flow pattern and water cut measurement device and method based on the orthogonal complementary microwave dual mode technology for the problems of complex flow states (variable flow patterns) of gas-water / oil-water two-phase flows and difficulty in accurately measuring the water content in the full range under high-salinity working conditions.

[0005] The flow pattern and water cut measurement device based on orthogonal microwave dual modes includes:

[0006] A test combined pipeline body, including a non-metallic pipe section and a metallic pipe section, for flowing gas-water / oil-water two-phase flows;

[0007] A dual-mode microwave sensor, including a conformal antenna array unit and an orthogonal microwave transmission line unit. The conformal antenna array unit is located in the non-metallic pipe section at the front end, and the orthogonal microwave transmission line unit is located in the metallic pipe section at the rear end; the orthogonal detection fields of the internal structures of the conformal antenna array unit and the orthogonal microwave transmission line unit intersect to form an orthogonal complementary dual-mode microwave detection field for comprehensively covering the pipeline fluid area;

[0008] A data detection unit, for generating microwave signals and transmitting the microwave signals to the excitation end of the dual-mode microwave sensor; simultaneously receiving the microwave signals transmitted back from the receiving end of the dual-mode microwave sensor, detecting their amplitude and phase information, and transmitting the amplitude and phase information to the data processing unit.

[0009] A data processing unit, connected to the data detection unit, for processing measurement data; including:

[0010] A data receiving module, for receiving the amplitude and phase information of the microwave signal transmitted by the data detection unit;

[0011] A data processing module, for predicting the flow pattern and water cut by substituting the amplitude and phase information into a model.

[0012] A method for measuring the flow pattern and water cut based on orthogonal microwave dual-mode, using the above device, includes the following steps:

[0013] Install the dual-mode microwave sensor in the two-phase flow pipeline through the test combined pipeline body;

[0014] Generate a microwave signal through the data detection unit and transmit the microwave signal to the excitation end of the dual-mode microwave sensor;

[0015] The excitation end of the dual-mode microwave sensor propagates the microwave signal into the two-phase flow in the pipeline;

[0016] The receiving end of the dual-mode microwave sensor receives the microwave signal after passing through the two-phase flow and transmits the microwave signal to the data detection unit;

[0017] The data detection unit detects the amplitude and phase information of the microwave signal and transmits the amplitude and phase information to the data processing unit;

[0018] The data processing unit predicts the flow pattern and water cut of the two-phase flow by substituting the amplitude and phase information into a preset model.

[0019] Due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0020] The present invention combines two microwave modal methods, the antenna method and the transmission line method. Since the characteristics of the internal microwave detection fields constructed by different principles are different, under the same change of flow pattern water cut, the microwave signals of the two methods will show different change rules, with rich microwave phase / amplitude information, which can improve the measurement accuracy of water cut.

[0021] In addition, around the core idea of constructing an orthogonal microwave detection field, a combined structure of a conformal antenna array unit and an orthogonal microwave transmission line unit is ingeniously designed, which can realize a dual microwave orthogonal detection field intersecting at 45 degrees, and can complementarily cover the pipeline fluid area in all directions to capture the distribution of the gas-water / oil-water two-phase space and accurately invert the flow pattern information.

[0022] The present invention is suitable for application in the fields of crude oil and natural gas engineering, and can accurately predict the flow pattern and water cut of gas-water / oil-water two-phase flow online. Description of the Drawings

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the flow pattern and water cut measurement device based on orthogonal microwave dual-mode for the embodiments of the present application.

[0024] Figure 2 is Figure 1 The two-dimensional structural schematic diagram on the right side.

[0025] Figure 3 This is the distribution of the sensitive area of the dual-mode sensor and the gas-liquid two-phase flow in the horizontal pipeline in the embodiments of the present application.

[0026] Figure 4 This is the data detection unit and data processing unit of the dual-mode sensor in the embodiments of the present application.

[0027] Figure 5 This is the relationship between the normalized amplitude / phase of the dual-mode sensor and the water cut change under stratified flow in the embodiments of the present application.

[0028] Figure 6 This is the water cut prediction result of the dual-mode sensor under stratified flow in the embodiments of the present application.

[0029] Figure 7 This is the absolute error of the water cut prediction of the dual-mode sensor under stratified flow in the embodiments of the present application.

[0030] Figure 8 This is the relationship between the normalized amplitude / phase of the dual-mode sensor and the water cut change under annular flow in the embodiments of the present application.

[0031] Figure 9 This is the water cut prediction result of the dual-mode sensor under annular flow in the embodiments of the present application.

[0032] Figure 10 This is the absolute error of the water cut prediction of the dual-mode sensor under annular flow in the embodiments of the present application.

[0033] Explanation of the reference numerals in the drawings:

[0034] 1. Non-metallic pipe body of the conformal antenna array unit; 2. Metal pipe body of the orthogonal microwave transmission line unit; 3. First conformal antenna; 4. Third conformal antenna; 5. Second conformal antenna; 6. Fourth conformal antenna; 7. Vertical transmission line; 8. Horizontal transmission line. Specific embodiments

[0035] The following further describes the present invention in detail with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] Such as Figure 1 and Figure 2As shown in the figure, an embodiment of the present application provides a two-phase flow pattern and water content measuring device based on a positive-interaction complementary microwave dual-mode sensor, which can be used for real-time measurement of key process parameters at the wellhead in the field of crude oil and natural gas engineering. The device includes: a non-metal pipe body 1 of a conformal antenna array unit and a metal pipe body 2 of an orthogonal microwave transmission line unit through which the two-phase flow passes in sequence, which constitute the test combined pipeline body; a dual-mode microwave sensor, including a first conformal antenna 3, a third conformal antenna 4, a second conformal antenna 5, and a fourth conformal antenna 6 of the conformal antenna array unit (mode one); a vertical transmission line 7 and a horizontal transmission line 8 of the orthogonal microwave transmission line unit (mode two).

[0037] In some preferred embodiments, in the mode one unit, the four conformal antennas are axially symmetrically circumferentially spaced at 90 degrees on the same cross-section and are attached to the non-metal pipe body 1. The opposite-side antennas are grouped in pairs, that is, the first conformal antenna 3 and the second conformal antenna 5 form a vertical antenna pair, with the former port as the excitation end (port 1) and the latter port as the receiving end (port 2); the third conformal antenna 4 and the fourth conformal antenna 6 form a horizontal antenna pair, with the former port as the excitation end (port 3) and the latter port as the receiving end (port 4). The sensitive regions of the two orthogonal antenna pairs construct a set of non-invasive orthogonal microwave detection fields inside the pipeline. Figure 3 Figures (a), (b), and (c) respectively list and show the phase distribution of the orthogonal microwave field sensitive regions of the conformal antenna array and the low water content stratified flow, high water content stratified flow, and annular flow patterns. It can be seen that the gas-liquid two-phase distributions are different for different flow patterns, and the dielectric constant of the water medium entering the sensitive region is different, so the microwave signal response can be judged to be different.

[0038] In some preferred embodiments, in the mode two unit, the metal inner electrodes of the vertical transmission line 7 and the horizontal transmission line 8 vertically and horizontally penetrate the metal pipe body 2 at a certain interval along the axial direction. Figure 2 In Figure, the upper port of the vertical transmission line 7 is the excitation end (port 5), and the lower port is the receiving end (port 6); the right port of the horizontal transmission line 8 is the excitation end (port 7), and the left port is the receiving end (port 8). The sensitive regions of the two orthogonal transmission lines construct a set of invasive orthogonal microwave detection fields inside the pipeline. Figure 3 Figures (d), (e), and (f) respectively list and show the phase distribution of the orthogonal microwave field sensitive regions of the orthogonal transmission lines and the low water content stratified flow, high water content stratified flow, and annular flow patterns. Combining Figure 3As shown in (a), (b), and (c), the orthogonal detection fields of the internal structures of the first-mode unit and the second-mode unit intersect at 45 degrees, forming a positive-interaction complementary dual-mode microwave detection field, which can comprehensively cover the pipeline fluid area in a complementary manner. Under the same flow pattern, although the gas-water two-phase distribution is the same, the situation of the water medium entering the sensitive areas of the two modes is different. The dual complementary orthogonal microwave fields can sense more flow pattern distribution information and more accurately predict the flow pattern; similarly, when the water content changes, the two-phase distribution changes regularly, and the complementary orthogonal microwave fields can also easily respond and more accurately predict the change in water content.

[0039] Furthermore, the conformal antenna includes a flexible dielectric substrate, a metal patch radiation unit, a metal ground unit, and a feeding unit, and is a single-port structure. The transmission line includes a metal rod inner conductor, a metal pipe outer conductor, and a coaxial connection feeding unit, and is a dual-port structure.

[0040] In some preferred embodiments, the data detection unit and the data processing unit are as Figure 4 shown. Microwave signals at multiple / single frequency points are generated by a microwave source. After passing through an octal power divider, eight identical microwave signals can be divided. Four of them are respectively transmitted to four excitation ports, namely port 1 of the vertical antenna pair, port 3 of the horizontal antenna pair, port 5 of the vertical transmission line 7, and port 7 of the horizontal transmission line, and the other four are used as reference signals. Two amplitude detectors respectively detect the amplitude differences between the received signals at port 2 of the vertical antenna pair and port 4 of the horizontal antenna pair and the reference signals, and output the amplitude voltage signal F AV of the vertical antenna pair and the amplitude voltage signal F AH of the horizontal antenna pair; similarly, two phase detectors respectively detect the phase differences between the received signals at port 6 of the vertical transmission line and port 8 of the horizontal transmission line and the reference signals, and output the phase voltage signal of the vertical transmission line and the phase voltage signal of the horizontal transmission line; the amplitude / phase voltage signals F AV 、F AH 、 and are respectively collected by a data acquisition card and transmitted to the data processing unit.

[0041] After receiving the amplitude / phase voltage data, the data processing unit first performs normalization processing and then makes real-time predictions according to the established flow pattern and water content models.

[0042] Let the normalized values of F AV 、F AH 、 and be F AV-nor 、F AH-nor 、 and The expressions are defined as follows respectively

[0043]

[0044]

[0045]

[0046]

[0047] In the formula: F represents the amplitude; represents the phase; the subscript A represents the conformal antenna; the subscript E represents the transmission line; the subscript V represents the vertical; the subscript H represents the horizontal; the subscript - nor represents the normalized result; the subscripts - max and - min represent the maximum and minimum values in the measured values respectively.

[0048] An embodiment of the present application also provides a method for measuring two - phase flow pattern and water content based on a positive - interaction complementary microwave dual - mode sensor. Using the above - mentioned device, it includes the following steps:

[0049] Install the above - mentioned device in the gas - water / oil - water two - phase flow test pipeline through a flange;

[0050] Connect the eight ports of the data detection unit to the excitation ends and receiving ends of the vertical antenna pair of the dual - mode microwave sensor mode one unit, the excitation ends and receiving ends of the horizontal antenna pair, as well as the excitation ends and receiving ends of the vertical transmission line of the dual - mode microwave sensor mode two unit and the excitation ends and receiving ends of the horizontal transmission line;

[0051] Generate microwave signals at multiple / single frequency points through the data detection unit and transmit the microwave signals to the four excitation ends of the dual - mode microwave sensor;

[0052] The excitation ends of the dual - mode microwave sensor propagate the microwave signals into the gas - water / oil - water two - phase flow in the test pipeline;

[0053] The receiving ends of the dual - mode microwave sensor receive the microwave signals after propagation through the two - phase flow and transmit the microwave signals to the data detection unit;

[0054] The data detection unit receives the amplitude and phase information of the microwave signals;

[0055] The data processing unit substitutes the amplitude and phase information into the model to predict the flow pattern and water content.

[0056] Embodiment: Since the flow patterns of gas-water two-phase flow are more complex than those of oil-water two-phase flow, and the two-phase flow in wellhead production generally has a relatively high salinity, the embodiments of the present application take the gas-water two-phase flow and the working condition of high conductivity of 2 S / m (salinity of about 10,000 ppm) as examples to present implementation cases.

[0057] Common gas-water two-phase flow patterns include stratified flow, wavy flow, slug flow, and annular flow. Considering that the first three flow patterns mainly show a stratified distribution structure with air on the upper layer and water on the lower layer in the cross-section of the measurement pipeline, while the annular flow mainly shows an annular distribution structure with a central gas core and an outer liquid film ring, the two-phase flow pattern and water content measurement method based on a cross-orthogonal complementary microwave dual-mode sensor are proposed with two typical structures of stratified flow and annular flow as representatives.

[0058] 1. For the case of stratified flow

[0059] Figure 5 Shows the variation relationship between the normalized amplitude / phase of the dual-mode sensor and the water content under stratified flow with a conductivity of 2 S / m. It can be seen that the F of the conformal antenna array unit in Mode 1 AV-nor and F AH-nor and the and of the orthogonal transmission line unit in Mode 2 all increase monotonically with the increase of water content and can still well reflect the change of water content in the pipeline under high conductivity.

[0060] In addition, it is found that the variation trends of the normalized results of the two-mode units are different. At the same water content, the amplitudes F of the vertical and horizontal antenna pairs AV-nor and F AH-nor are almost equal (the difference between the two is less than the first preset threshold), while the phases and of the vertical and horizontal transmission lines differ greatly (the difference between the two is greater than the second preset threshold). This is because the orthogonal detection characteristics of the two modes are different. Under stratified flow, the situation of water medium entering the sensitive areas of the vertical and horizontal antenna pairs is the same, so F Figure 3 and F AV-nor and F AH-nor are almost equal. However, the situation of entering the sensitive areas of the vertical and horizontal transmission lines is different. When the water content is small (as shown in (d) in Figure 3 ), the water medium only enters the sensitive area of the vertical transmission line and does not enter the sensitive area of the horizontal transmission line, so the value is large and is close to 0; when the water content is large (as shown in (e) in Figure 3 ), the area of the water medium entering the sensitive area of the vertical transmission line is smaller than that entering the horizontal transmission line, so is less than .

[0061] Based on Figure 5 in FAV-nor , F AH-nor , and data, adopt the constraint expression form in formula to fit and establish a two - mode water - cut prediction model for stratified flow, with a correlation coefficient as high as 0.9986.

[0062]

[0063] In the formula: α represents the water - cut; the undetermined coefficients a1, a2, a3, and a4 are 0.590096, 2.224807, 0.394659, and 0.028145 respectively.

[0064] Furthermore, in order to quantitatively evaluate the prediction performance of the water - cut model, the following evaluation indexes of absolute error Abs, relative error Rel, mean absolute error MAE, and mean absolute relative error MARE are introduced:

[0065]

[0066]

[0067]

[0068]

[0069] In the formula: p represents the number of experiments; the subscripts pre and act of α represent the predicted value and the true value of the water - cut respectively.

[0070] The prediction results of the stratified - flow water - cut and their errors are respectively as shown in Figure 6 , 7 and Table 1. Under the conditions of water - cut from 0% to 100% and conductivity of 2 S / m, the range of Abs of the prediction results is - 4.62% to 2.08%, the range of Rel is - 2.66% to 1.30%, the MAE is 1.06%, and the MARE is 2.04%. It can be seen that the prediction results of the water - cut under stratified flow are good.

[0071] 2. For the annular - flow case

[0072] Figure 8 shows the relationship between the normalized amplitude / phase of the dual - mode sensor and the water - cut change under annular flow with a conductivity of 2 S / m. It can be seen that F AV-nor , F AH-nor , and They also increase monotonically with the increase of water content and can well reflect the change of water content in the pipeline under high conductivity. It is also found that the variation trends of the normalization results of the two-mode units are different, but at the same water content, the results of the two antennas are the same, and the results of the two transmission lines are also the same. This is because in the annular flow ( Figure 3 ), the gas-water two-phase shows a circumferential axisymmetric distribution, and the situation of the water medium entering the sensitive areas of the vertical and horizontal antenna pairs is the same. Therefore, F AV-nor and F AH-nor are almost equal (the difference between the two is less than the first preset threshold); similarly, the situation of entering the sensitive areas of the vertical and horizontal transmission lines is also the same. Therefore, and are almost equal (the difference between the two is less than the second preset threshold); however, due to the different microwave detection field characteristics of the two-mode units, their normalization results are different.

[0073] Based on Figure 8 the data of F AV-nor , F AH-nor , and , adopting the constraint expression form in formula , a prediction model of the water content of the annular flow in the two modes is established by fitting, and the correlation coefficient is as high as 0.9999.

[0074]

[0075] In the formula: the undetermined coefficients b1, b2, b3, and b4 are 1.289684, -0.154291, -0.289118, and -1.337603 respectively.

[0076] The prediction results and their errors of the water content of the annular flow are shown in Figure 9 , 10 and Table 1 respectively. At a water content of 0 - 100% and a conductivity of 2 S / m, the Abs range of the prediction results is -0.12 - 0.06%, the Rel range is -0.12 - 0.09%, the MAE is 0.05%, and the MARE is 0.06%. It can be seen that compared with stratified flow, the accuracy of the two-mode microwave sensor in predicting the water content of annular flow is higher.

[0077] Table 1 Summary of water content prediction errors

[0078]

[0079] In Figure 5 and Figure 8 , under the two typical distribution structures of stratified flow and annular flow, the two amplitude signals (F AV-nor and F AH-nor ) of the mode-one conformal antenna array unit and the two phase signals of the mode-two orthogonal transmission line unit ( and The change trends of ) are completely different. The two modal units can make corresponding regular responses according to the changes in the spatial distribution of the gas-water two-phase. Therefore, based on F AV-nor , F AH-nor , and the difference law of the signals in the time sequence change for flow pattern prediction, and then select the corresponding water cut prediction model according to the flow pattern, so as to realize the online accurate measurement of the two-phase flow pattern and water cut based on the positive interaction complementary microwave dual-mode sensor.

[0080] In summary, in the embodiment of the present application, by fusing the conformal antenna array unit (mode one) and the orthogonal microwave transmission line unit (mode two), an orthogonal microwave detection field with double complementarity is constructed to complementarily cover the two-phase flow region in the pipeline. Based on the amplitude / phase signal changes of the dual-mode microwave, the measurement of the two parameters of the flow pattern and the full-range water cut is realized.

[0081] The above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A flow pattern and water content measuring device based on orthogonal microwave dual modes, characterized in that: Comprising: A test combined pipeline body, including a non-metallic pipe section and a metallic pipe section, for flowing through gas-water / oil-water two-phase flow; A dual-mode microwave sensor, including a conformal antenna array unit and an orthogonal microwave transmission line unit. The conformal antenna array unit is located at the non-metallic pipe section at the front end, and the orthogonal microwave transmission line unit is located at the metallic pipe section at the back end; the orthogonal detection fields of the internal structures of the conformal antenna array unit and the orthogonal microwave transmission line unit intersect to form a positive and complementary dual-mode microwave detection field for omnidirectionally covering the pipeline fluid area; A data detection unit, for generating microwave signals and transmitting the microwave signals to the excitation end of the dual-mode microwave sensor; simultaneously receiving the microwave signals transmitted back by the receiving end of the dual-mode microwave sensor, detecting their amplitude and phase information, and transmitting the amplitude and phase information to the data processing unit; A data processing unit, connected to the data detection unit, for processing measurement data; including: A data receiving module, for receiving the amplitude and phase information of the microwave signals transmitted by the data detection unit; A data processing module, for substituting the amplitude and phase information into a model to predict the flow pattern and water cut.

2. The flow pattern and water cut measuring device based on orthogonal microwave dual-mode according to claim 1, wherein: Comprising: The conformal antenna array unit includes four conformal antennas. The four conformal antennas are symmetrically circumferentially installed at 90-degree intervals on the non-metallic pipe section in the same cross-section. The antennas on the opposite sides are grouped in pairs to form a vertical antenna pair and a horizontal antenna pair respectively, thereby constructing a set of non-intrusive orthogonal microwave detection fields.

3. The flow pattern and water cut measurement device based on orthogonal microwave bimodality according to claim 2, wherein: Comprising: The orthogonal microwave transmission line unit includes two transmission lines. The metal inner conductors of the two transmission lines vertically and horizontally penetrate the metallic pipe section at a certain interval along the axis respectively to form a vertical transmission line and a horizontal transmission line respectively, thereby constructing a set of intrusive orthogonal microwave detection fields.

4. The flow pattern and water cut measuring device based on orthogonal microwave dual modes according to claim 3, characterized in that: Comprising: The data detection unit includes: A microwave signal source, for generating microwave signals of multiple or single frequency points; An eight-way power divider, for dividing the microwave signals into eight identical signals; Four amplitude and phase detectors, respectively for detecting the amplitude differences of the vertical antenna pair and the horizontal antenna pair, and the phase differences of the vertical transmission line and the horizontal transmission line; An acquisition card, for acquiring the amplitude and phase voltage signals and transmitting them to the data processing unit.

5. The flow pattern and water cut measuring device based on orthogonal microwave dual mode according to any one of claims 1 to 4, characterized in that: The data processing unit further includes: A data normalization module, for normalizing the acquired amplitude and phase voltage signals; A model fitting module, for fitting a prediction model of the flow pattern and water cut according to the normalized data.

6. A flow pattern and water cut measuring method based on orthogonal microwave dual mode, using the device according to any one of claims 1 to 5, characterized in that: Install the dual-mode microwave sensor in the two-phase flow pipeline through the test combined pipeline body; Generate microwave signals through the data detection unit and transmit the microwave signals to the excitation end of the dual-mode microwave sensor; The excitation end of the dual-mode microwave sensor propagates the microwave signals into the two-phase flow in the pipeline; The receiving end of the dual-mode microwave sensor receives the microwave signal after passing through the two-phase flow and transmits the microwave signal to the data detection unit; The data detection unit detects the amplitude and phase information of the microwave signal and transmits the amplitude and phase information to the data processing unit; The data processing unit substitutes the amplitude and phase information into a preset model to predict the flow pattern and water content of the two-phase flow.

7. The flow pattern and water cut measurement method based on orthogonal microwave bimodality according to claim 6, characterized in that The flow pattern is identified in the following way: Calculate the difference value between the normalized amplitude signal and the phase signal, including: Amplitude difference value ΔFA = | - |; where is the amplitude signal after normalizing the amplitude voltage signal F AV ; is the amplitude signal after normalizing the amplitude voltage signal F AH ; Phase difference value = | - |; where is the phase voltage signal of the vertical transmission line after normalization, is the phase voltage signal of the horizontal transmission line after normalization; Set a threshold according to the difference value to judge the flow pattern: If ΔFA is less than the first preset threshold and greater than the second preset threshold, it is identified as stratified flow; If ΔFA is less than the first preset threshold and less than the second preset threshold, it is identified as annular flow.

8. The flow pattern and water cut measurement method based on orthogonal microwave bimodality according to claim 7, wherein, When it is stratified flow, the expression of its water content prediction model is: ； where α represents the moisture content, , , , are model coefficients obtained by fitting.

9. The flow pattern and water cut measurement method based on orthogonal microwave bimodality according to claim 7, characterized in that When it is annular flow, the expression of its water content prediction model is: ； where α represents the moisture content, , , , are model coefficients obtained by fitting.

10. The flow pattern and water cut measurement method based on orthogonal microwave dual modes according to claim 8 or 9, characterized in that The water content prediction model can perform full-range measurement under the conductivity of 2S / m.

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