A device and method for measuring the liquid volume of a flowback fluid in a well test

Abstract

The present application belongs to the technical field of oil and gas testing and logging, and discloses a device and method for measuring the volume of flowback fluid in oil and gas testing and logging. The device comprises a buffer tank, which is provided with a liquid inlet, a liquid outlet, a liquid outlet and a gas release port. The liquid inlet is connected to the liquid outlet pipe of the flowback fluid, and the liquid outlet is provided with a liquid outlet pipe to communicate with the liquid pool. A partition is arranged in the buffer tank to divide the buffer tank into a first chamber and a second chamber. A liquid flow channel is arranged between the partition and the inner wall of the buffer tank to communicate the first chamber and the second chamber. A stirrer is arranged in the first chamber, and a liquid level meter is arranged in the second chamber. An electric ball valve is arranged on the liquid outlet pipe, and an electromagnetic flowmeter is arranged on the liquid outlet pipe between the liquid outlet and the electric ball valve. The present application sets the buffer tank and the partition, which facilitates the pressure relief of the flowback fluid and the obtaining of the liquid level height of the stable liquid. The present application realizes the continuous and smooth flow of the flowback fluid to achieve the purpose of accurately measuring the volume of the flowback fluid.

Description

Technical Field

[0001] This invention relates to the field of oil and gas logging technology in petroleum exploration, and particularly to a device and method for measuring the volume of flowback fluid in oil and gas logging. Background Technology

[0002] With the development of unconventional oil and gas fields, fracturing technology is increasingly being used in the oil exploration and production process. One of the main processes after fracturing is flowback. In order to more accurately measure the flowback rate of fracturing fluid, it is necessary to accurately measure the flowback fluid at the wellhead.

[0003] In existing technologies, flowback fluid volume is measured using vortex flowmeters. When the data is large and fluctuates abnormally, measurement is generally based primarily on experience, supplemented by vortex flowmeter data, which fails to meet the actual requirements of flowback fluid measurement. Furthermore, due to the small nozzle diameter, under the pressure and gas conditions downhole, a significant portion of the flowback fluid pipeline cannot be fully filled, affecting the sensor's measurement accuracy to some extent. In closed pipelines, flowback fluid measurement suffers from the inability to accurately and timely collect all required liquid and sand samples, hindering the establishment of a flowback protocol. Summary of the Invention

[0004] The purpose of this invention is to provide a device and method for measuring the volume of flowback fluid in well logging, so as to solve the problems of sampling difficulties and low measurement accuracy in measuring the volume of flowback fluid using vortex flowmeters, which affect the establishment and optimization of flowback systems.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention first provides a device for measuring the volume of flowback fluid in well logging, comprising:

[0007] A buffer tank is provided with a liquid inlet, a liquid outlet, a liquid outlet and a gas release port. The liquid inlet is connected to a drain pipe to input the return liquid, and the liquid outlet is provided with a drain pipe to connect to the drain pool.

[0008] A partition is provided inside the buffer tank to divide the buffer tank into a first compartment and a second compartment. A liquid flow channel is provided between the partition and the inner wall of the buffer tank to connect the first compartment and the second compartment.

[0009] A stirrer is provided in the first chamber, and the liquid inlet, the liquid outlet, the gas release port and the liquid outlet are all provided in the first chamber;

[0010] A level gauge is installed in the second compartment;

[0011] An electric ball valve is installed on the liquid outlet pipe;

[0012] An electromagnetic flow meter is installed on the outlet pipe between the outlet and the electric ball valve.

[0013] Optionally, the buffer tank is also provided with an overflow port, which is located at the top of the second compartment and connected to the drainage pool through an overflow pipe.

[0014] Optionally, the liquid inlet is located on the side wall near the top of the first chamber, the liquid outlet is located on the side wall near the bottom of the first chamber, the gas release port is located at the top of the first chamber near the liquid inlet, the gas release port is provided with a sand removal port, and the liquid outlet is located at the center of the bottom of the buffer tank.

[0015] Optionally, the top and both sides of the partition are fixedly connected to the inner wall of the buffer tank, and the liquid flow channel is provided between the bottom end of the partition and the bottom wall of the buffer tank.

[0016] Optionally, the first compartment is larger than the second compartment.

[0017] Optionally, the inner walls of the buffer tank, the electromagnetic flowmeter, and the electric ball valve are all lined with PTFE.

[0018] Optionally, the liquid volume measurement device for the flowback fluid in the oil and gas logging test also includes a control instrument, and the level gauge and the electric ball valve are both connected to the control instrument.

[0019] Optionally, the orifice diameter of the outlet pipe is larger than the diameter of the drain pipe.

[0020] This invention also provides a method for measuring the volume of flowback fluid in well testing and gas logging. Based on the device for measuring the volume of flowback fluid in well testing and gas logging, the method includes the following steps:

[0021] S1, the backflow liquid reaches the inlet through the drain pipe and enters the first chamber of the buffer tank. The gas in the backflow liquid is released through the vent to obtain the backflow liquid at normal pressure. The agitator is started.

[0022] S2, the backflow liquid under normal pressure enters the second chamber through the liquid flow channel, and sand samples and liquid samples are obtained through the gas release port and liquid intake port respectively;

[0023] S3, read the liquid level gauge reading to obtain liquid level data, and control the opening of the electric ball valve according to the liquid level gauge reading to control the liquid output of the outlet, so as to ensure that the liquid in the outlet pipe is full.

[0024] S4, read the reading of the electromagnetic flowmeter to obtain the liquid volume data of the return liquid.

[0025] Optionally, both the liquid level data and the liquid volume data are sent to the monitoring and control instrument. The monitoring and control instrument sends the liquid level data to the input / output module and the electric ball valve respectively, and sends the liquid volume data to the input / output module. The input / output module sends the liquid level data and the liquid volume data to the host computer.

[0026] The beneficial effects of this invention are:

[0027] The present invention relates to a fluid volume measurement device for flowback fluid in well logging. This device incorporates a buffer tank with a liquid intake port and a gas release port to facilitate pressure release and sampling measurement of the flowback fluid. A partition divides the buffer tank into a first compartment and a second compartment, allowing for accurate measurement of the stable fluid level using a level gauge. Through the level gauge, electric ball valve, and electromagnetic flowmeter, a continuous and stable flow of flowback fluid across the full pipe is achieved, enabling precise measurement of the flowback fluid volume and facilitating the establishment and optimization of the flowback system.

[0028] The present invention provides a method for measuring the flowback fluid volume in well logging. The electric ball valve adjusts its opening according to the fluid level data to ensure that the outlet pipe where the electromagnetic flowmeter is located is always in a full pipe state. Therefore, it can achieve the purpose of accurately measuring the flowback fluid volume, which is beneficial for the establishment and optimization of the flowback system. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the liquid volume measurement device for oil and gas logging flowback fluid provided by the present invention;

[0030] Figure 2 This is a schematic diagram of the liquid level data and liquid volume data transmission in a liquid volume measurement device for oil and gas logging flowback fluid provided by the present invention.

[0031] In the picture:

[0032] 1. Buffer tank; 11. Inlet; 111. Drain pipe; 12. Take-out port; 13. Outlet port; 131. Outlet pipe; 14. Vent port; 15. First compartment; 16. Second compartment; 17. Overflow port; 171. Overflow pipe; 2. Baffle; 3. Agitator; 4. Level gauge; 5. Electric ball valve; 6. Electromagnetic flow meter; 7. Drainage tank; 8. Measurement and control instrument; 9. Input / output module. Detailed Implementation

[0033] The present invention 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 merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are merely used for descriptive distinction and have no special meaning. The term "multiple" should be understood as two or more.

[0037] This invention provides a device and method for measuring the volume of flowback fluid in well logging, in order to solve the problems of sampling difficulties and low measurement accuracy in measuring the volume of flowback fluid using vortex flowmeters, which affect the establishment and optimization of flowback systems.

[0038] This invention first provides a fluid volume measurement device for oil and gas logging flowback fluid, such as... Figure 1As shown, the system includes a buffer tank 1, a baffle 2, a stirrer 3, a level gauge 4, an electric ball valve 5, and an electromagnetic flow meter 6. The buffer tank 1 is equipped with an inlet 11, a outlet 12, an outlet 13, and a vent 14. The inlet 11 is connected to a drain pipe 111 to input the return liquid, and the outlet 13 is equipped with an outlet pipe 131 to connect to a drain tank 7. The baffle 2 is located inside the buffer tank 1 to divide it into a first compartment 15 and a second compartment 16. The baffle 2 is flush with the inner wall of the buffer tank 1. A liquid flow channel is provided to connect the first chamber 15 and the second chamber 16; a stirrer 3 is provided in the first chamber 15, and the liquid inlet 11, liquid outlet 12, liquid outlet 13 and gas release port 14 are all provided in the first chamber 15; a level gauge 4 is provided in the second chamber 16; an electric ball valve 5 is provided on the liquid outlet pipe 131; an electromagnetic flow meter 6 is provided on the liquid outlet pipe 131 between the liquid outlet 13 and the electric ball valve 5. In this embodiment, the distance between the electromagnetic flow meter 6 and the liquid outlet 13 is greater than 1m.

[0039] like Figure 1 As shown, buffer tank 1 is a large-volume container located between drain pipe 111 and outlet pipe 131. After the backflow liquid enters buffer tank 1 through drain pipe 111, the vent 14 facilitates the discharge of high-pressure gas in the backflow liquid, transforming the high-pressure backflow liquid into a normal-pressure state, thus preventing the backflow liquid in buffer tank 1 from generating bubbles that could affect liquid volume detection. Buffer tank 1 can hold more backflow liquid, which forms a stable liquid within it. Agitator 3 continuously stirs the first chamber 15 to ensure uniform mixing of sand and liquid, facilitating slow and even flowout and preventing sedimentation and blockage. Simultaneously, since the first chamber 15 and the second chamber 16 are connected by a liquid flow channel, forming a communicating vessel with the same liquid level, but because agitator 3 and inlet 11 are only located in the first chamber 15, the second chamber 16 has a stable liquid level, facilitating accurate liquid level measurement by level gauge 4. The opening of the electric ball valve 5 is controlled based on the liquid level data. This avoids frequent adjustments to the electric ball valve 5 and ensures that the section of the outlet pipe 131 equipped with the electromagnetic flowmeter 6 is always full, allowing for accurate measurement of the return liquid volume. It should be noted that to prevent sand sedimentation in the return liquid from causing pipeline blockage, the agitator 3 operates 24 hours a day. The sand can easily flow out under the tangential force of the return liquid. The main purpose of the baffle 8 is to stabilize the agitated liquid, allowing the level gauge 4 to more effectively measure the height of the return liquid level in the buffer tank 1.

[0040] The flowback fluid volume measurement device of this invention, through the installation of a buffer tank 1 with a liquid intake port 12 and a gas release port 14, facilitates the depressurization and sampling measurement of the flowback fluid. A partition 2 divides the buffer tank 1 into a first compartment 15 and a second compartment 16, allowing the level gauge 4 to measure the stable fluid level. Through the level gauge 4, electric ball valve 5, and electromagnetic flowmeter 6, the flowback fluid is continuously and smoothly discharged from the full pipe, achieving accurate measurement of the flowback fluid volume and facilitating the establishment and optimization of the flowback system.

[0041] Optionally, the buffer tank 1 is also provided with an overflow port 17, which is located at the top of the second compartment 16 and connected to the drain pool 7 through an overflow pipe 171.

[0042] like Figure 1 As shown, one end of the overflow pipe 171 is connected to the buffer tank 1 through the overflow port 17, and the other end is connected to the drainage pool 7. It can be understood that the backflow liquid has the characteristic of flowing in streams. Therefore, when the liquid level of the backflow liquid in the second compartment 16 is too high for a short period of time and cannot be adjusted by the maximum opening of the electric ball valve 5, it will overflow from the overflow port 17, which can recover the backflow liquid and avoid environmental pollution.

[0043] Optionally, the liquid inlet 11 is located on the side wall near the top of the first chamber 15, the liquid outlet 12 is located on the side wall near the bottom of the first chamber 15, the gas outlet 14 is located at the top of the first chamber 15 near the liquid inlet 11, the gas outlet 14 is provided with a sand outlet, and the liquid outlet 13 is located at the center of the bottom of the buffer tank 1.

[0044] It is understandable that the flowback fluid at the bottom of the well contains solid sand, liquid volume, and some gas. After insufficient gas-phase separation, it directly enters the buffer tank 1 through the inlet 11. Because the flowback fluid has a certain pressure and is also filled with some gas, it will appear in irregular streams of varying sizes. After entering the buffer tank 1, the vent 14 and the inlet 11 are set close to each other, so that the high-pressure gas can be released at the same time as the flowback fluid enters the buffer tank 1. After the gas is released, the flowback fluid is at atmospheric pressure, and the staff can take sand samples and analyze them through the sand sampler at the vent 14. In practical implementation, the vent 14 and the sand sampling port are the same opening. Only an hourglass or mesh screen needs to be installed at the vent 14 for sand filtration or other sand sampling. This embodiment is not specifically limited. The vent 14 and sand sampling port are located at the top of the first chamber 15 to facilitate the upward discharge of high-pressure gas, eliminating the need for an additional power source. Furthermore, the vent 14 is positioned close to the liquid inlet 11, which, due to the certain flow rate of the return liquid at the liquid inlet 11, further facilitates the escape of high-pressure gas. A valve is installed at the liquid sampling port 12, allowing personnel to sample and analyze the liquid by opening and closing the valve.

[0045] Optionally, the top and sides of the partition 2 are fixedly connected to the inner wall of the buffer tank 1, and a liquid flow channel is provided between the bottom end of the partition 2 and the bottom wall of the buffer tank 1.

[0046] like Figure 1 As shown, the liquid flow channel is located near the bottom of the buffer tank 1, away from the level gauge 4, to avoid the liquid flow affecting the reading of the level gauge 4. The stirrer 3 is positioned slightly higher than the top of the liquid flow channel to avoid affecting the stability of the liquid level in the second chamber 16. The liquid flow channel can be a gap created by the partition 2 being spaced from the bottom wall of the buffer tank 1, or the bottom end of the partition 2 can be provided with multiple holes to allow the backflow liquid to flow between the first chamber 15 and the second chamber 16. The specific form is not limited to the embodiment provided by this invention.

[0047] Optionally, the first compartment 15 is larger than the second compartment 16.

[0048] like Figure 1 As shown, the partition 2 is located on the side of the buffer tank 1 away from the center of the buffer tank 1. Figure 1 The outlet 13 is located at the center of the bottom of the buffer tank 1, and the baffle 2 is located on one side of the outlet 13 to form a second chamber 16 with a smaller volume. For ease of connection and smooth flow, the volume of the second chamber 16 can be set as small as possible, which is more conducive to obtaining a stable liquid level and improving the measurement accuracy of the level gauge 4. At the same time, the outlet 13 is located below the agitator 3, which can prevent sediment or sand from settling or clogging the outlet 13.

[0049] Optionally, the inner walls of the buffer tank 1, the electromagnetic flowmeter 6, and the electric ball valve 5 are all lined with PTFE, which provides good corrosion resistance and helps to extend the service life of the equipment and instruments.

[0050] Optionally, the liquid volume measurement device for the flowback fluid in the oil and gas logging test also includes a control instrument 8, and the level gauge 4 and the electric ball valve 5 are all connected to the control instrument 8.

[0051] like Figure 2 As shown, the measuring and control instrument 8 is used to receive the liquid level data from the level gauge 4 and send the liquid level data to the input / output module 9 and the electric ball valve 5 respectively. The electric ball valve 5 adjusts its opening degree according to the pre-set correlation with the liquid level data to adjust the liquid level height in the buffer tank 1. The input / output module 9 is used to receive the liquid level data from the level gauge 4 and the liquid volume data from the electromagnetic flow meter 6, and can send them to the host computer for monitoring and unified control.

[0052] Optionally, the orifice diameter of the outlet pipe 131 is larger than the diameter of the drain pipe 111.

[0053] It is understood that the flow rate of the flowback fluid downhole is abrupt, flowing in streams of varying sizes. Therefore, a buffer tank 1 is installed to control the outflow velocity and stability of the flowback fluid, temporarily storing it within the buffer tank 1. To control the liquid level in the buffer tank 1, the diameter of the outlet pipe 131 is larger than that of the drain pipe 111, facilitating timely reduction of the liquid level in the buffer tank 1 while ensuring a full flow from the outlet pipe 131. In some embodiments, the diameter of the outlet pipe 131 is four inches, and the diameter of the drain pipe 111 is two inches. Furthermore, the buffer tank 1 of this invention is equipped with an overflow port 17, ensuring safe and environmentally friendly production on site.

[0054] It is understood that the present invention uses an electromagnetic flowmeter 6 instead of the vortex flowmeter commonly used in the prior art for liquid volume measurement. Even when the backflow liquid data is large and fluctuates abnormally, it can also achieve accurate real-time automatic measurement of the backflow liquid volume. The buffer tank 1 is reserved with a liquid outlet 12 and a sand outlet (venting outlet 14) to meet the actual production needs on site.

[0055] Based on the liquid volume measurement device for flowback fluid in well testing and gas logging, the present invention also provides a method for measuring the liquid volume of flowback fluid in well testing and gas logging, comprising the following steps:

[0056] S1, the backflow liquid reaches the inlet 11 through the drain pipe 111 and enters the first chamber 15 of the buffer tank 1. The gas in the backflow liquid is released through the vent 14 to obtain backflow liquid under normal pressure. The agitator 3 is started.

[0057] It should be noted that the agitator 3 remains on after startup, which can prevent sedimentation in the first chamber 15, avoid clogging the outlet 13, and facilitate the discharge of gas from the backflow liquid.

[0058] S2, the backflow liquid under normal pressure enters the second chamber 16 through the liquid flow channel, and sand samples and liquid samples are obtained through the gas release port 14 and the liquid intake port 12 respectively;

[0059] When the level gauge 4 installed in the second compartment 16 shows that the liquid level has reached the specified height, sampling and analysis can be performed. Multiple sampling can be easily performed, including sand samples and liquid samples.

[0060] S3, read the reading of the level gauge 4 to obtain the level data, and control the opening of the electric ball valve 5 according to the reading of the level gauge 4 to control the liquid output of the outlet 13, so as to ensure that the liquid in the outlet pipe 131 is full.

[0061] The relationship between the liquid level data of the level gauge 4 and the opening degree of the electric ball valve 5 can be preset with a matching setting to achieve automatic control. Specifically, in some embodiments, when the liquid level data of the level gauge 4 is divided into multiple data intervals, each data interval corresponds to the opening degree of an electric ball valve 5, frequent adjustments of the electric ball valve 5 can be effectively avoided, and the liquid flow in the outlet pipe 131 can be stabilized, thereby improving the detection accuracy of the electromagnetic flowmeter 6.

[0062] S4, read the reading of electromagnetic flowmeter 6 to obtain the liquid volume data of the return liquid.

[0063] The present invention provides a method for measuring the flowback fluid volume in well logging. The electric ball valve 5 adjusts its opening according to the fluid level data to ensure that the outlet pipe 131 where the electromagnetic flowmeter 6 is located is always in a full pipe state. Therefore, it can achieve the purpose of accurately measuring the flowback fluid volume, which is beneficial for the establishment and optimization of the flowback system.

[0064] Optionally, both the liquid level data and the liquid volume data are sent to the input / output module 9, which then sends the liquid level data and the liquid volume data to the host computer.

[0065] The liquid level data is sent to the input / output module (I / O module) 9 via the measuring and control instrument 8. The electromagnetic flowmeter 6 is directly connected to the input / output module 9 to transmit the liquid volume data. The input / output module 9 connects to the host computer to realize real-time monitoring of the liquid level data and liquid volume data, which facilitates further optimization of the measurement method and improvement of the measurement accuracy of the liquid volume measurement method.

[0066] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A device for measuring the volume of flowback fluid in oil and gas logging, characterized in that, include: The buffer tank (1) is provided with an inlet (11), a take-out port (12), an outlet (13) and a venting port (14). The inlet (11) is connected to a drain pipe (111) to input the return liquid, and the outlet (13) is provided with an outlet pipe (131) to connect to the drain pool (7). A partition (2) is provided inside the buffer tank (1) to divide the buffer tank (1) into a first compartment (15) and a second compartment (16). A liquid flow channel is provided between the partition (2) and the inner wall of the buffer tank (1) to connect the first compartment (15) and the second compartment (16). A stirrer (3) is located in the first chamber (15), and the liquid inlet (11), the liquid outlet (12), the liquid outlet (13) and the gas release outlet (14) are all located in the first chamber (15). A level gauge (4) is installed in the second compartment (16); An electric ball valve (5) is installed on the liquid outlet pipe (131); An electromagnetic flowmeter (6) is installed on the outlet pipe (131) between the outlet (13) and the electric ball valve (5); It also includes a measuring and control instrument (8), and the level gauge (4) and the electric ball valve (5) are both connected to the measuring and control instrument (8); The measuring and control instrument (8) is used to receive the liquid level data of the liquid level gauge (4) and send the liquid level data to the electric ball valve (5). The electric ball valve (5) adjusts the opening degree according to the pre-set correlation with the liquid level data to adjust the liquid level height in the buffer tank (1).

2. The liquid volume measuring device for well logging flowback fluid according to claim 1, characterized in that, The buffer tank (1) is also provided with an overflow port (17), which is located at the top of the second chamber (16) and connected to the drain pool (7) through an overflow pipe (171).

3. The liquid volume measuring device for oil and gas logging flowback fluid according to claim 1, characterized in that, The liquid inlet (11) is located on the side wall near the top of the first chamber (15), the liquid outlet (12) is located on the side wall near the bottom of the first chamber (15), the gas release port (14) is located at the top of the first chamber (15) near the liquid inlet (11), the gas release port (14) is provided with a sand removal port, and the liquid outlet (13) is located at the center of the bottom of the buffer tank (1).

4. The liquid volume measuring device for flowback fluid in well logging according to claim 1, characterized in that, The top and both sides of the partition (2) are fixedly connected to the inner wall of the buffer tank (1), and the liquid flow channel is provided between the bottom end of the partition (2) and the bottom wall of the buffer tank (1).

5. The liquid volume measuring device for oil and gas logging flowback fluid according to claim 1, characterized in that, The first compartment (15) is larger than the second compartment (16).

6. The liquid volume measuring device for oil and gas logging flowback fluid according to claim 1, characterized in that, The inner walls of the buffer tank (1), the electric ball valve (5), and the electromagnetic flowmeter (6) are all lined with PTFE.

7. The liquid volume measuring device for oil and gas logging flowback fluid according to claim 1, characterized in that, The diameter of the outlet pipe (131) is larger than the diameter of the drain pipe (111).

8. A method for measuring the volume of flowback fluid in oil and gas logging, characterized in that, The liquid volume measurement device for the flowback fluid in oil and gas logging according to any one of claims 1-7, wherein the liquid volume measurement method for the flowback fluid in oil and gas logging comprises the following steps: S1, the backflow liquid reaches the inlet (11) through the drain pipe (111) and enters the first chamber (15) of the buffer tank (1). The gas in the backflow liquid is released through the vent (14) to obtain the backflow liquid under normal pressure. The agitator (3) is started. S2, the backflow liquid under normal pressure enters the second chamber (16) through the liquid flow channel, and sand samples and liquid samples are obtained through the gas release port (14) and liquid intake port (12) respectively; S3, read the reading of the liquid level gauge (4) to obtain the liquid level data, and control the opening of the electric ball valve (5) according to the reading of the liquid level gauge (4) to control the liquid output of the outlet (13) and ensure that the liquid in the outlet pipe (131) is full. S4, read the reading of the electromagnetic flowmeter (6) to obtain the liquid volume data of the return liquid.

9. The method for measuring the volume of flowback fluid in well logging according to claim 8, characterized in that, The liquid level data and the liquid volume data are both sent to the measuring and control instrument (8). The measuring and control instrument (8) sends the liquid level data to the input / output module (9) and the electric ball valve (5) respectively, and sends the liquid volume data to the input / output module (9). The input / output module (9) sends the liquid level data and the liquid volume data to the host computer.

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