Miniaturized gas-resistant oil well water content on-line detection device

Abstract

The invention belongs to the field of oil gas water content detection, particularly relates to a miniaturized gas-resistant oil well water content online detection device, and aims to solve the problem that the detection precision is seriously reduced due to the fact that a detection probe cannot be completely immersed in crude oil in an existing crude oil water content online measurement technology. According to the device, a gas branch and a liquid branch are fixedly connected and communicated, the gas branch is arranged above the liquid branch, and a valve is installed on the gas branch and used for controlling opening and closing of the gas branch; the probe penetrates through the gas branch and is arranged in the liquid branch, the probe is used for emitting electromagnetic waves into the liquid branch and obtaining signals reflected by the inner wall of the liquid branch, and the oil-water proportion is calculated based on the attenuation amplitude and the phase change of the signals. Through the design of gas and liquid separation, the precision, the adaptability, the structure compactness, the operation convenience, the system reliability and the real-time monitoring capability of crude oil moisture content detection are improved, and meanwhile environmental protection is facilitated.

Description

Technical Field

[0001] This invention belongs to the field of oil and gas water content detection, and specifically relates to a miniaturized gas-resistant online water content detection device for oil wells. Background Technology

[0002] The four main principles for online measurement of water content in two-phase flow oil are capacitance, microwave, optics, radiation sources, and density. Capacitance, microwaves, optics, and radiation sources all utilize the spectral characteristics of electromagnetic waves, characterizing the properties of the analyte by exploiting the differences in physical properties exhibited by the same analyte at different frequencies. Capacitance and microwaves rely on differences in the dielectric properties of the analyte. Optics and radiation sources utilize differences in reflection / refraction and absorption of the analyte. Density depends on differences in the density of the analyte.

[0003] When performing online monitoring of crude oil water content, if the oil well contains a significant amount of gas, a situation arises where crude oil is at the bottom and gas is at the top in the delivery pipeline. Conventionally, directly inserting the detection probe into the pipeline transporting the crude oil results in the probe not being fully submerged in the crude oil, severely impacting detection accuracy. Existing online crude oil water content measurement technologies are insufficient for measuring crude oil water content under conditions of high gas-liquid ratios.

[0004] Based on this, the present invention proposes a miniaturized gas-resistant online water content detection device for oil wells. Summary of the Invention

[0005] To address the aforementioned problems in existing technologies, namely the significant decrease in accuracy of current online crude oil water content measurement technology under high gas-liquid ratio conditions due to the inability of the detection probe to be fully immersed in the crude oil, this invention proposes a miniaturized gas-resistant online oil well water content detection device, comprising a gas branch, a liquid branch, valves, and a probe.

[0006] The gas branch is fixedly connected to and communicates with the liquid branch. The gas branch is located above the liquid branch. A valve is installed on the gas branch, and the valve is used to control the opening and closing of the gas branch.

[0007] The probe is positioned in the liquid branch through the gas branch. The probe is used to emit electromagnetic waves into the liquid branch and acquire the signal reflected by the inner wall of the liquid branch. The oil-water ratio is calculated based on the attenuation amplitude and phase change of the signal.

[0008] In some preferred embodiments, the liquid branch includes an inlet section, a middle section, and an outlet section;

[0009] One end of the inlet section is fixedly connected and communicates with the lower side of one side of the gas branch, the other end of the inlet section is connected with one end of the middle section, the other end of the middle section is connected with one end of the outlet section, and the other end of the outlet section is fixedly connected and communicates with the lower side of the other side of the gas branch.

[0010] In some preferred embodiments, the valve is an electric valve.

[0011] In some preferred embodiments, the valve is located in the middle of the gas branch.

[0012] In some preferred embodiments, the length direction of the gas branch is parallel to the length direction of the middle section.

[0013] In some preferred embodiments, the two ends of the inlet section and the outlet section are respectively perpendicular to the gas branch and the middle section.

[0014] In some preferred embodiments, the valve is provided with a control module, which is connected to a control terminal and is used to enable remote control of the valve.

[0015] In some preferred embodiments, the probe has a built-in wireless communication module, which is used to remotely transmit the data detected by the probe to a control terminal.

[0016] The beneficial effects of this invention are:

[0017] Improved detection accuracy: By designing separate gas and liquid branches, the influence of gas on the detection results under high gas-liquid ratio conditions is effectively avoided, ensuring that the probe can accurately contact the liquid part, thereby improving the detection accuracy of water content.

[0018] High adaptability: This device can operate stably under different working environments and conditions, especially for crude oil pipelines containing a large amount of gas, and can effectively overcome the problems existing in traditional detection methods.

[0019] Compact structure: The miniaturized design not only saves space but also facilitates installation and maintenance, reduces equipment costs, and increases the flexibility of use.

[0020] Easy to operate: Using an electric valve as the control component, remote operation and monitoring can be achieved through an automated control system, simplifying the operation process and reducing the need for manual intervention.

[0021] Environmental protection: Because this device can more accurately measure the water content of crude oil, it helps to reduce unnecessary processing, energy consumption and environmental pollution. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the internal cavity of a miniaturized gas-resistant online water content detection device for oil wells according to the present invention;

[0024] Figure 2 This is a schematic diagram of the working principle of the probe of a miniaturized gas-resistant online water content detection device for oil wells according to the present invention;

[0025] Figure 3 This is a schematic diagram of the valve opening of a miniaturized gas-resistant online water content detection device for oil wells according to the present invention;

[0026] Figure 4 This is a schematic diagram of the valve closure of a miniaturized gas-resistant online water content detection device for oil wells according to the present invention;

[0027] Figure 5 This is a simulation test data diagram of 2% water cut in a miniaturized gas-resistant online water cut detection device for oil wells based on the present invention;

[0028] Figure 6 This is a simulation test data diagram of 95% water cut in a miniaturized gas-resistant online water cut detection device for oil wells based on the present invention;

[0029] Figure 7 Based on the present invention, a miniaturized gas-resistant online water content detection device for oil wells is available at a liquid flow rate of 1 m³ / h. 3 / h, gas flow rate 10Nm 3 Moisture content measured under / h conditions;

[0030] Figure 8 Based on the present invention, a miniaturized gas-resistant online water content detection device for oil wells is available at a liquid flow rate of 1 m³ / h. 3 / h, gas flow rate 20Nm 3 Moisture content measured under / h conditions;

[0031] Figure 9 Based on the present invention, a miniaturized gas-resistant online water content detection device for oil wells is available at a liquid flow rate of 1 m³ / h. 3 / h, gas flow rate 30Nm 3 Moisture content measured under / h conditions;

[0032] Figure 10 Based on the present invention, a miniaturized gas-resistant online water content detection device for oil wells is available at a liquid flow rate of 1 m³ / h. 3 / h, gas flow rate 35Nm 3 Moisture content measurement value under / h conditions. Detailed Implementation

[0033] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] like Figures 1-4 As shown, the present invention provides a miniaturized gas-resistant online water content detection device for oil wells, including a gas branch 1, a liquid branch 2, a valve 3, and a probe 4;

[0036] The gas branch 1 is fixedly connected to and communicates with the liquid branch 2. The gas branch 1 is located above the liquid branch 2. A valve 3 is installed on the gas branch 1. The valve 3 is used to control the opening and closing of the gas branch 1.

[0037] The probe 4 is installed in the liquid branch 2 through the gas branch 1. The probe 4 is used to emit electromagnetic waves into the liquid branch 2 and acquire the signal reflected by the inner wall 5 of the liquid branch 2. The oil-water ratio is calculated based on the attenuation amplitude and phase change of the signal.

[0038] When using this invention, the following steps are included:

[0039] Step 1, Preparation Stage:

[0040] Install the entire device near the well outlet, ensuring that the inlet of liquid branch 2 is connected to the well pipeline.

[0041] Check that valve 3 is closed to ensure that the gas-liquid mixture enters the liquid branch 2 directly in the initial state.

[0042] Step 2, Gas-Liquid Separation:

[0043] When valve 3 is opened, the gas-liquid mixture enters the device. The gas rises naturally due to its lower density and is discharged through gas branch 1, while the liquid sinks due to gravity and accumulates in liquid branch 2.

[0044] After a period of time, liquid branch 2 is filled with liquid, and probe 4 is completely submerged in the liquid, preparing for subsequent measurements.

[0045] Step 3, Static Measurement:

[0046] When valve 3 is closed, gas discharge stops, and the liquid in liquid branch 2 is in a relatively static state.

[0047] Probe 4 starts working, emitting electromagnetic waves in all directions. These electromagnetic waves pass through the liquid and are reflected back to the probe by the inner wall 5 of the liquid branch 2.

[0048] By analyzing the attenuation amplitude and phase change of the reflected signal, the oil-water ratio in the liquid is calculated, and static water content data is obtained.

[0049] Step 4, fluid replacement:

[0050] After completing the static measurement, valve 3 is opened again, and gas branch 1 is reopened.

[0051] At this point, the new gas-liquid mixture continues to flow into liquid branch 2, pushing out the previously deposited liquid and achieving liquid renewal and replacement.

[0052] By repeating the gas-liquid separation and static measurement steps described above, multiple measurements can be performed continuously, improving the representativeness and accuracy of the data.

[0053] This invention effectively achieves gas-liquid separation by combining gas branch 1 and liquid branch 2, ensuring that probe 4 can operate in an environment free from gas interference.

[0054] This invention not only accurately measures the oil-water ratio under static conditions, but also adapts to online monitoring needs in high gas-liquid ratio environments by continuously updating the liquid sample. Simultaneously, the automatic control function of valve 3 makes the entire measurement process more intelligent and efficient, reducing the need for manual intervention.

[0055] The valve 3 is an electric valve, and it is located in the middle of the gas branch 1.

[0056] As a further explanation of the present invention, the liquid branch 2 includes an inlet section 21, a middle section 22, and an outlet section 23;

[0057] One end of the inlet section 21 is fixedly connected and communicates with the lower side of one side of the gas branch 1, the other end of the inlet section 21 is connected with one end of the middle section 22, the other end of the middle section 22 is connected with one end of the outlet section 23, and the other end of the outlet section 23 is fixedly connected and communicates with the lower side of the other side of the gas branch 1.

[0058] This invention, through its three-section liquid branch 2 structure, effectively achieves gas-liquid separation, stabilizes the liquid environment, and enables liquid replacement and renewal. Specifically:

[0059] This invention effectively separates gas and liquid:

[0060] Inlet section 21: Located below one side of gas branch 1, it is fixedly connected to and communicates with gas branch 1. This design allows the gas to rise rapidly and be discharged through gas branch 1 after the gas-liquid mixture enters the device, while the liquid sinks due to gravity and enters the middle section 22 of liquid branch 2. This helps to achieve efficient gas-liquid separation, ensuring that the liquid branch is mainly composed of liquid and reducing gas interference with detection.

[0061] Stable liquid environment:

[0062] Middle Section 22: Located in the middle of liquid branch 2, this is the main flow area for the liquid. The design of Middle Section 22 ensures stable liquid flow within this area, providing a good measurement environment for Probe 4. Probe 4 is completely immersed in the liquid, allowing for more accurate measurement of the oil-water ratio and improved detection precision.

[0063] Fluid replacement and renewal:

[0064] Outlet section 23: Located below and fixedly connected to gas branch 1 on the other side. The design of outlet section 23 allows a new gas-liquid mixture to enter through inlet section 21 after each measurement, while the previous liquid is pushed out through outlet section 23, thus achieving liquid replacement. This ensures that fresh liquid samples are used for each measurement, improving the representativeness and accuracy of the data.

[0065] The multi-segment design of this invention makes the entire device compact, facilitating installation and maintenance. Simultaneously, the automatic control of the electric valve 3 enables automated gas-liquid separation and liquid replacement, simplifying the operation process and improving work efficiency.

[0066] This design is particularly suitable for oil well environments with high gas-liquid ratios. Through effective gas-liquid separation and liquid renewal, relatively accurate water cut measurements can be obtained even in environments containing large amounts of gas, thus improving the applicability and reliability of the device.

[0067] In summary, this multi-stage liquid branch design not only optimizes the gas-liquid separation effect, but also ensures the stability of the detection environment and the accuracy of the measurement data, enabling the device to perform excellently in oil well environments with high gas-liquid ratios.

[0068] The length direction of the gas branch 1 is parallel to the length direction of the middle section 22.

[0069] The parallel arrangement of the gas branch 1 and the middle section 22 in this invention facilitates better separation of gas and liquid during flow. Because of its lower density, the gas naturally rises and exits along the gas branch 1, while the liquid flows along the middle section 22 of the liquid branch 2. This minimizes gas residue in the liquid branch, ensuring that the liquid branch primarily contains pure liquid and improving detection accuracy.

[0070] The inlet section 21 and the outlet section 23 are respectively perpendicular to the gas branch 1 and the middle section 22.

[0071] The inlet section 21 and outlet section 23 of this invention are perpendicular to the gas branch 1 and the intermediate section 22. This design allows the gas to rise rapidly and exit through the gas branch 1 after entering the inlet section 21, while the liquid enters the intermediate section 22 vertically. Similarly, after flowing in the intermediate section 22, the liquid is discharged vertically through the outlet section 23, ensuring effective separation of gas and liquid.

[0072] The probe 4 is completely submerged in the outlet section 23.

[0073] The valve 3 is equipped with a control module, which is connected to a control terminal and is used to enable remote control of the valve 3.

[0074] The probe 4 has a built-in wireless communication module, which is used to remotely transmit the data detected by the probe 4 to the control terminal.

[0075] like Figures 5-10 As shown, this invention performs device calibration and moisture content testing according to laboratory experimental procedures, as detailed below:

[0076] (1) Experimental Objective

[0077] According to the design requirements, the working status and performance of the detection device under different gas-liquid ratios were simulated, as well as the working conditions of gas-liquid mixtures with different proportions.

[0078] (2) Experimental procedure

[0079] Compare the data from this device (Model E) and Model B moisture meter.

[0080] (3) Data comparison and analysis

[0081] Group 1: Under simulated operating conditions (1 MPa), the gas-liquid ratio is 2:1, corresponding to a standard gas-liquid ratio of 20:1. Tests were conducted on crude oil with 2% water content, resulting in 520 sets of experimental data.

[0082] The second group: under simulated operating conditions (1 MPa), the gas-liquid ratios were 1:1 and 2:1, corresponding to the standard conditions of gas-liquid ratios of 10:1 and 20:1. 95% water-containing crude oil was tested, and 2549 sets of experimental data were obtained.

[0083] Depend on Figure 5 and Figure 6 It can be seen that under simulated operating conditions (1 MPa) with gas-liquid ratios of 1:1 and 2:1, corresponding to standard gas-liquid ratios of 10:1 and 20:1, the measured values ​​of the existing prototype model E and the mass-produced model B fluctuate significantly during the liquid displacement process when the valve is closed. This indicates that the original moisture content detection method does not work well under conditions with a large gas-liquid ratio. During the sampling process when the valve is open, the measured values ​​of the prototype model E tend to be stable and close to the actual values, indicating that it can work normally.

[0084] (4) Test and analysis under various gas flow rates

[0085] Experiment 1: At a liquid flow rate of 1 m³ / s 3 / h, gas flow rate 10Nm 3 / h, i.e., a gas-liquid ratio of 10:1, was used to test the online water cut of high gas-liquid ratio oil wells at actual measurement conditions of 30%, 50%, and 80%. 1000 sets of data were collected for each water cut, and the measurement curves are shown below. Figure 7 As shown.

[0086] Depend on Figure 7 It can be seen that the measured values ​​of the device are relatively stable within the range of moisture content tested, fluctuating within the error range. The device can work normally under the simulated standard condition with a gas-liquid ratio of 10:1, and at the same time, it can ensure the accuracy of moisture content measurement.

[0087] Experiment 2: At a liquid flow rate of 1 m³ / s 3 / h, gas flow rate 20Nm 3 / h, i.e., a gas-liquid ratio of 20:1, was used to test the online water cut of high gas-liquid ratio oil wells at actual measurement conditions of 30%, 50%, and 80%. 1000 sets of data were collected for each water cut, and the measurement curves are shown below. Figure 8 As shown.

[0088] The data results show that the measured values ​​of the device are relatively stable within the tested moisture content range, fluctuating within the error range. The device can work normally under the simulated standard condition with a gas-liquid ratio of 20:1, and can ensure the accuracy of moisture content measurement.

[0089] Experiment 3: At a liquid flow rate of 1 m³ / h 3 / h, gas flow rate 30Nm 3 / h, i.e., a gas-liquid ratio of 30:1, was used to test the online water cut of high gas-liquid ratio oil wells at actual measurement conditions of 30%, 50%, and 80%. 1000 sets of data were collected for each water cut, and the measurement curves are shown below. Figure 9 As shown.

[0090] The data results show that the measured values ​​of the device are relatively stable within the tested moisture content range, fluctuating within the error range. The data fluctuations increase under the simulated standard condition of a gas-liquid ratio of 30:1, but the device can still work normally and ensure the accuracy of moisture content measurement.

[0091] Experiment 4: At a liquid flow rate of 1 m³ / s 3 / h, with a maximum gas flow rate of 35 Nm 3 / h, i.e., a gas-liquid ratio of 35:1, was used to test the online water cut of high gas-liquid ratio oil wells at actual measurement conditions of 30%, 50%, and 80%. 1000 sets of data were collected for each water cut, and the measurement curves are shown below. Figure 10 As shown.

[0092] The data results show that the measured values ​​of the device are relatively stable within the tested moisture content range, fluctuating within the error range. The data fluctuations increase under the simulated standard condition with a gas-liquid ratio of 35:1, but the device can still work normally and ensure the accuracy of moisture content measurement.

[0093] Experiment 5: Simultaneously test under different liquid volumes and various gas-liquid ratios to verify the working condition and measurement accuracy of this device under various operating conditions. Take multiple sets of data for comparison to ensure that this device can cope with various situations.

[0094] (5) Test data analysis

[0095] Moisture content tests were conducted at different liquid and gas flow rates (i.e., different gas-liquid ratios). The maximum error was -4.10%, the minimum error was 0.5%, and the experimental error distribution range was (-4.1%, +4.0%), with an overall error range of <±5%, which meets the design requirements. The moisture content test data are shown in Table 1.

[0096] Table 1:

[0097] In the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0098] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0099] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent in such process, method, article, or apparatus / device.

[0100] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A miniaturized, gas-resistant online water content detection device for oil wells, characterized in that, It includes a gas branch (1), a liquid branch (2), a valve (3), and a probe (4); The gas branch (1) is fixedly connected to and communicates with the liquid branch (2). The gas branch (1) is located above the liquid branch (2). A valve (3) is installed on the gas branch (1). The valve (3) is used to control the opening and closing of the gas branch (1). The probe (4) passes through the gas branch (1) and is placed in the liquid branch (2). The probe (4) is used to emit electromagnetic waves into the liquid branch (2) and obtain the signal reflected by the inner wall (5) of the liquid branch (2). The oil-water ratio is calculated based on the attenuation amplitude and phase change of the signal.

2. The miniaturized gas-resistant online water content detection device for oil wells according to claim 1, characterized in that, The liquid branch (2) includes an inlet section (21), a middle section (22), and an outlet section (23); One end of the inlet section (21) is fixedly connected and communicates with the lower side of the gas branch (1), the other end of the inlet section (21) is connected with one end of the middle section (22), the other end of the middle section (22) is connected with one end of the outlet section (23), and the other end of the outlet section (23) is fixedly connected and communicates with the lower side of the other side of the gas branch (1).

3. The miniaturized gas-resistant online water cut detection device for oil wells according to claim 1, characterized in that, The valve (3) is an electric valve.

4. A miniaturized gas-resistant online water content detection device for oil wells according to claim 2, characterized in that, The valve (3) is located in the middle of the gas branch (1).

5. A miniaturized gas-resistant online water content detection device for oil wells according to claim 2, characterized in that, The length direction of the gas branch (1) is parallel to the length direction of the middle section (22).

6. A miniaturized gas-resistant online water cut detection device for oil wells according to claim 2, characterized in that, The two ends of the inlet section (21) and the outlet section (23) are respectively perpendicular to the gas branch (1) and the middle section (22).

7. A miniaturized gas-resistant online water content detection device for oil wells according to claim 1, characterized in that, The valve (3) is equipped with a control module, which is connected to a control terminal. The control module is used to enable remote control of the valve (3).

8. A miniaturized gas-resistant online water cut detection device for oil wells according to claim 1, characterized in that, The probe (4) has a built-in wireless communication module, which is used to remotely transmit the data detected by the probe (4) to the control terminal.

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