Device for monitoring fractured phase fraction and flowback rate of carbon dioxide

Abstract

The invention discloses a carbon dioxide fracturing phase fraction and flowback rate monitoring device, and relates to the technical field of CCUS, the carbon dioxide fracturing phase fraction and flowback rate monitoring device comprises a multiphase flowmeter, a carbon dioxide monitor and a simulated fracturing system; wherein the multiphase flowmeter is connected with the carbon dioxide monitor through a pipeline; the simulated fracturing system is in signal connection with the multiphase flowmeter and the carbon dioxide monitor through two signal lines. By arranging the multi-phase flow meter, the carbon dioxide monitor and the simulated fracturing system, the content of carbon dioxide dissolved in a liquid phase can be calibrated and metered, real-time and online monitoring of the gas phase fraction after carbon dioxide pre-fracturing is achieved, the carbon dioxide monitor and the simulated fracturing system are combined, and the carbon dioxide pre-fracturing performance is improved. The carbon dioxide content in the flow-back liquid can be calculated only by measuring the carbon dioxide content in the flow-back liquid, so that accurate measurement of the gas-liquid-solid three-phase fractions and continuous online monitoring of the carbon dioxide content in the flow-back liquid are conveniently realized, meanwhile, the measurement cost is reduced, and the monitoring advancement of the carbon dioxide phase fractions and the flow-back rate is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of CCUS, and particularly to a monitoring device for carbon dioxide fracturing phase fraction and flowback rate. Background Art

[0002] CCUS (Carbon Capture, Utilization and Storage) is a necessary technical measure to achieve the dual-carbon strategy of 30 / 60. Carbon dioxide pre-fracturing is an economical and effective CCUS technical measure. In order to approve the carbon sequestration rate of this measure, it is necessary to monitor the carbon dioxide content produced after the well is fractured.

[0003] There are mainly two current monitoring methods. One is to use a sampling bag to take samples, and then send the samples to the laboratory for analysis of the gas-phase components to calculate the carbon dioxide content. The other is to use a handheld carbon dioxide monitor to directly measure on the flowback or production pipeline.

[0004] However, both of the above two monitoring methods have the disadvantages of being unable to continuously monitor and unable to monitor the carbon dioxide content dissolved in water or oil-water mixture. At the same time, during the flowback and production processes, the carbon dioxide content is unstable and fluctuates greatly, and carbon dioxide is easily soluble in water and oil-water mixture. In view of the above problems, the present invention proposes a monitoring device for carbon dioxide fracturing phase fraction and flowback rate to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a monitoring device for carbon dioxide fracturing phase fraction and flowback rate, aiming to solve the problems of low measurement accuracy of the gas-liquid-solid three-phase phase fraction, inability to continuously monitor, and inability to monitor the carbon dioxide content dissolved in water or oil-water mixture. To achieve the above purpose, the present invention provides the following technical solutions:

[0006] The present invention provides a monitoring device for carbon dioxide fracturing phase fraction and flowback rate, and the device includes: a multiphase flowmeter, a carbon dioxide monitor, and a simulation fracturing system; wherein,

[0007] The multiphase flowmeter is connected to the carbon dioxide monitor through a pipeline; the simulation fracturing system is signal-connected to the carbon dioxide monitor through a first signal line; the simulation fracturing system is signal-connected to the multiphase flowmeter through a second signal line.

[0008] Further, the multiphase flowmeter includes a Venturi tube, a dual-energy gamma sensor, and an MVT multi-parameter measuring instrument; wherein,

[0009] The Venturi tube is used to measure the total liquid flow rate; the dual-energy gamma sensor is used to measure the three-phase phase fraction; the MVT multi-parameter measuring instrument is used to measure temperature and pressure parameters.

[0010] Furthermore, the simulation fracturing system is used to generate the solubility of carbon dioxide in oil, water, and oil-water mixtures through experimental data and establish a solubility software model.

[0011] Furthermore, the simulation fracturing system consists of a data acquisition unit, a solubility calculation unit, and a model establishment unit; among them,

[0012] The data acquisition unit includes a data access module; the data acquisition unit is used to access the data monitored by the multiphase flowmeter and the carbon dioxide monitor, and collect the temperature and pressure of carbon dioxide in the liquid phase;

[0013] The solubility calculation unit includes a liquid-phase density storage module and a calculation module; the solubility calculation unit is used to store the densities of oil, water, and oil-water mixtures, and calculate the solubility of carbon dioxide in oil, water, and oil-water mixtures to obtain liquid-phase dissolution data;

[0014] The model establishment unit includes a liquid-phase data classification module and a line graph generation module; the model establishment unit is used to classify the obtained liquid-phase dissolution data, then process the classified liquid-phase dissolution data, and generate a line graph.

[0015] Furthermore, the data acquisition unit also includes a temperature acquisition module and a pressure acquisition module.

[0016] Furthermore, the line graph generation module includes a line graph display module, a line graph editing module, a line graph comparison module, and a line graph storage module.

[0017] The technical effects and advantages of the present invention:

[0018] 1. By setting a multiphase flowmeter, a carbon dioxide monitor, and a simulation fracturing system, the present invention can calibrate and measure the content of carbon dioxide dissolved in the liquid phase, realize real-time and on-line monitoring of the gas-phase fraction after carbon dioxide pre-fracturing, and combine the carbon dioxide monitor and the simulation fracturing system to calculate the carbon dioxide content in the flowback fluid, thus conveniently realizing accurate measurement of the gas-liquid-solid three-phase fraction and continuous on-line monitoring of the carbon dioxide content in the flowback fluid. At the same time, it reduces the measurement cost and improves the advancement of carbon dioxide fraction and flowback rate monitoring.

[0019] 2. The present invention uses a simulated fracturing system composed of a data acquisition unit, a solubility calculation unit, and a model establishment unit. The data acquisition unit accesses the data monitored by a multiphase flowmeter and a carbon dioxide monitor, and collects the temperature and pressure of carbon dioxide in the liquid phase. The solubility calculation unit calculates the solubility of carbon dioxide in oil, water, and oil-water mixtures to obtain liquid phase dissolution data. The model establishment unit classifies the obtained liquid phase dissolution data and processes the classified liquid phase dissolution data to synchronously generate a line chart.

[0020] Other features and advantages of the present invention will be described in the following specification, and, in part, will become apparent from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention can be realized and obtained through the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a schematic diagram of a monitoring device for the phase fraction and flowback rate of carbon dioxide fracturing of the present invention;

[0023] Figure 2 It is a schematic diagram of the composition of the simulated fracturing system of the present invention;

[0024] Reference numerals: 1, multiphase flowmeter; 2, carbon dioxide monitor; 21, pipeline; 3, simulated fracturing system; 31, first signal line; 32, second signal line; 200, data acquisition unit; 300, solubility calculation unit; 400, model establishment unit; 201, data access module; 202, temperature acquisition module; 203, pressure acquisition module; 301, liquid phase density storage module; 302, calculation module; 401, liquid phase data classification module; 402, line chart generation module; 4020, line chart display module; 4030, line chart editing module; 4040, line chart comparison module; 4050, line chart storage module. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] To solve the deficiencies of the prior art, the present invention discloses a monitoring device for the phase fraction and flowback rate of carbon dioxide fracturing. Figure 1 The following is a schematic diagram of the monitoring device for the phase fraction and flowback rate of carbon dioxide fracturing of the present invention, as Figure 1 shown, the device includes: a multiphase flowmeter 1, a carbon dioxide monitor 2, and a simulated fracturing system 3; wherein, the multiphase flowmeter 1 is connected to the carbon dioxide monitor 2 through a pipeline 21; the simulated fracturing system 3 is signal-connected to the carbon dioxide monitor 2 through a first signal line 31; the simulated fracturing system 3 is signal-connected to the multiphase flowmeter 1 through a second signal line 32.

[0027] By adopting the above technical solution, by setting the multiphase flowmeter 1, the carbon dioxide monitor 2, and the simulated fracturing system 3, the content of carbon dioxide dissolved in the liquid phase can be calibrated and measured, the real-time and on-line monitoring of the gas phase fraction after carbon dioxide pre-fracturing is realized, and combined with the carbon dioxide monitor 2 and the simulated fracturing system 3, the content of carbon dioxide in the flowback fluid can be calculated.

[0028] Further, the multiphase flowmeter 1 includes a Venturi tube, a dual-energy gamma sensor, and an MVT multi-parameter measuring instrument.

[0029] By adopting the above technical solution, through the multiphase flowmeter 1 composed of a Venturi tube, a dual-energy gamma sensor, and an MVT multi-parameter measuring instrument, wherein the Venturi tube can measure the total liquid flow rate, the dual-energy gamma sensor can measure the three-phase fraction, and the MVT multi-parameter measuring instrument can measure parameters such as temperature and pressure. Because carbon dioxide is easily soluble in water, oil, or oil-water mixture, and the solubility difference in oil and water is relatively large, and the solubility changes greatly with the changes of temperature, pressure, and the quality of oil.

[0030] Further, the simulated fracturing system 3 is used to generate the solubility of carbon dioxide in oil, water, and oil-water mixture through experimental data and establish a solubility software model.

[0031] By adopting the above technical solution, when the simulation fracturing system 3 is actually metered, the parameters of oil and water are input. The simulation fracturing system 3 combines the real-time temperature, pressure and other parameters measured by the MVT multi-parameter measuring instrument for calibration calculation to obtain the carbon dioxide content in the liquid phase, and automatically converts it into the gas volume flow under standard conditions. The gas phase flow finally displayed by the multiphase flowmeter 1 is the standard gas phase volume flow including the carbon dioxide content in the liquid phase. Combining with the carbon dioxide monitor 2, the carbon dioxide content in the flowback fluid can be obtained.

[0032] Specifically, Figure 2 is a schematic diagram of the composition of the simulation fracturing system of the present invention, as Figure 2 shown, the simulation fracturing system 3 is composed of a data acquisition unit 200, a solubility calculation unit 300 and a model establishment unit 400; wherein, the data acquisition unit 200 includes a data access module 201, the solubility calculation unit 300 includes a liquid phase density storage module 301 and a calculation module 302, and the model establishment unit 400 includes a liquid phase data classification module 401 and a line graph generation module 402.

[0033] Furthermore, the data acquisition unit 200 further includes a temperature acquisition module 202 and a pressure acquisition module 203.

[0034] Furthermore, the line graph generation module 402 includes a line graph display module 4020, a line graph editing module 4030, a line graph comparison module 4040 and a line graph storage module 4050.

[0035] By adopting the above technical solution, through the data acquisition unit 200 composed of a data access module 201, a temperature acquisition module 202, and a pressure acquisition module 203, the data access module 201 accesses the data monitored by the multiphase flowmeter 1 and the carbon dioxide monitor 2. The temperature acquisition module 202 and the pressure acquisition module 203 acquire the temperature and pressure of carbon dioxide in the liquid phase. Through the solubility calculation unit 300 composed of a liquid phase density storage module 301 and a calculation module 302, the liquid phase density storage module 301 stores the densities of oil, water, and oil-water mixtures for subsequent calculations. The calculation module 302 calculates the solubility of carbon dioxide in oil, water, and oil-water mixtures to obtain the liquid phase dissolution data. Through the model establishment unit 400 composed of a liquid phase data classification module 401 and a line graph generation module 402, the liquid phase data classification module 401 classifies the obtained liquid phase dissolution data. The line graph generation module 402 processes the classified liquid phase dissolution data and generates a line graph. At the same time, the line graph display module 4020 displays the generated line graph. The line graph editing module 4030 allows operators to edit and process the generated line graph. The line graph comparison module 4040 can compare the historical line graph with the real-time line graph for operators to analyze the carbon dioxide fracturing phase fraction and the flowback rate at different time periods. The line graph storage module 4050 stores the generated line graph for subsequent retrieval and viewing.

[0036] Furthermore, the working principle of a monitoring device for carbon dioxide fracturing phase fraction and flowback rate of the present invention is as follows: When the monitoring device is in use, by setting a multiphase flowmeter 1, a carbon dioxide monitor 2, and a simulation fracturing system 3, the venturi tube in the multiphase flowmeter 1 measures the total liquid flow rate, the dual-energy gamma sensor measures the three-phase phase fraction, and the MVT multi-parameter measuring instrument measures parameters such as temperature and pressure. Since carbon dioxide is easily soluble in water, oil, or oil-water mixtures, and the solubility difference in oil and water is relatively large, and the solubility changes greatly with the changes of temperature, pressure, and the quality of oil. During actual measurement by the simulation fracturing system 3, the parameters of oil and water are input, and the simulation fracturing system 3 combines the real-time temperature and pressure parameters measured by the PVT multi-parameter measuring instrument for calibration calculation to obtain the carbon dioxide content in the liquid phase and automatically convert it into the gas volume flow rate under standard conditions. The gas phase flow rate finally displayed by the multiphase flowmeter 1 is the standard gas phase volume flow rate including the carbon dioxide content in the liquid phase. Combining with the carbon dioxide monitor 2, the carbon dioxide content in the flowback fluid can be obtained, thus conveniently realizing the accurate measurement of the gas-liquid-solid three-phase phase fraction and the continuous on-line monitoring of the carbon dioxide content in the flowback fluid. At the same time, the measurement cost is reduced, and the advancement of carbon dioxide phase fraction and flowback rate monitoring is improved.

[0037] Through the simulation fracturing system 3 composed of a data acquisition unit 200, a solubility calculation unit 300, and a model establishment unit 400, the data acquisition unit 200 accesses the data monitored by the multiphase flowmeter 1 and the carbon dioxide monitor 2, and collects the temperature and pressure of carbon dioxide in the liquid phase. The solubility calculation unit 300 calculates the solubility of carbon dioxide in oil, water, and oil-water mixtures to obtain the liquid phase dissolution data. The model establishment unit 400 classifies the obtained liquid phase dissolution data and processes the classified liquid phase dissolution data to synchronously generate a line graph.

[0038] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A monitoring device for the phase fraction and flowback rate of carbon dioxide fracturing, characterized in that, The device includes: a multiphase flowmeter (1), a carbon dioxide monitor (2), and a simulation fracturing system (3); wherein, The multiphase flowmeter (1) is connected to the carbon dioxide monitor (2) through a pipeline (21); the simulation fracturing system (3) is signal-connected to the carbon dioxide monitor (2) through a first signal line (31); the simulation fracturing system (3) is signal-connected to the multiphase flowmeter (1) through a second signal line (32).

2. The monitoring device for carbon dioxide fracturing phase fraction and flowback rate according to claim 1, characterized in that The multiphase flowmeter (1) includes a Venturi tube, a dual-energy gamma sensor, and an MVT multi-parameter measuring instrument; wherein, The Venturi tube is used to measure the total liquid flow rate; the dual-energy gamma sensor is used to measure the three-phase phase fraction; the MVT multi-parameter measuring instrument is used to measure temperature and pressure parameters.

3. The monitoring device for carbon dioxide fracturing phase fraction and flowback rate according to claim 1 or 2, characterized in that, The simulation fracturing system (3) is used to generate the solubility of carbon dioxide in oil, water, and oil-water mixtures based on experimental data and establish a solubility software model.

4. The monitoring device for carbon dioxide fracturing phase fraction and flowback rate according to claim 3, wherein The simulation fracturing system (3) consists of a data acquisition unit (200), a solubility calculation unit (300), and a model establishment unit (400); wherein, The data acquisition unit (200) includes a data access module (201); the data acquisition unit (200) is used to access the data monitored by the multiphase flowmeter (1) and the carbon dioxide monitor (2), and collect the temperature and pressure of carbon dioxide in the liquid phase; The solubility calculation unit (300) includes a liquid-phase density storage module (301) and a calculation module (302); the solubility calculation unit (300) is used to store the densities of oil, water, and oil-water mixtures, calculate the solubility of carbon dioxide in oil, water, and oil-water mixtures, and obtain liquid-phase dissolution data; The model establishment unit (400) includes a liquid-phase data classification module (401) and a line graph generation module (402); the model establishment unit (400) is used to classify the obtained liquid-phase dissolution data, then process the classified liquid-phase dissolution data, and generate a line graph.

5. The monitoring device for carbon dioxide fracturing phase fraction and flowback rate according to claim 4, wherein The data acquisition unit (200) further includes a temperature acquisition module (202) and a pressure acquisition module (203).

6. The monitoring device for carbon dioxide fracturing phase fraction and flowback rate according to claim 4, characterized in that, The line graph generation module (402) includes a line graph display module (4020), a line graph editing module (4030), a line graph comparison module (4040), and a line graph storage module (4050).

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