A method for calculating the oil-water volume of a liquid storage tank, a measuring device and a liquid storage tank

Abstract

The present invention relates to the technical field of gas production technology in oil and gas fields, and in particular to a method for calculating the oil and water volume of a liquid storage tank, a measuring device and a liquid storage tank. Step 1: a liquid level measuring mechanism is provided to measure the total height h of the liquid level in the liquid storage tank. 总 , set up a pressure measuring mechanism to measure the total pressure P of the liquid in the liquid storage tank; Step 2, calculate the height h of the water in the liquid storage tank 水 and the oil height h 油 ; Step 3, according to h 总 Calculate the total volume V of the liquid in the tank 总 , according to h 水 Calculate the volume V of water in the tank 水 , according to V 总 and V 水 Calculate the volume V of the oil in the tank 油 . From this, we can get the total height of the liquid level in the liquid storage tank h 总 , the volume of water V 水 , oil volume V 油 , realizing the monitoring of daily production volume in the liquid storage tank. During the measurement process, the liquid level measurement mechanism only needs to measure the liquid level height of a single medium oil. The measurement is simpler and more accurate. In addition, the total height of the liquid level can be measured directly to avoid tank overflow.

Description

Technical Field

[0001] The invention relates to the technical field of gas production technology in oil and gas fields, in particular to a method for calculating the oil-water volume of a liquid storage tank, a measuring device and a liquid storage tank. Background Art

[0002] In the production of oil and gas fields, in order to obtain the daily oil production, a liquid level gauge is often used to measure the liquid level in the storage tank, and the oil production is calculated by measuring the data. There are many types of liquid level gauges. The magnetic flap level gauge commonly used at present is developed using the principle of communicating vessels, the principle of buoyancy and the effect of magnetic coupling. It can accurately measure a single medium fluid, but when the produced oil contains water, due to the difference in oil and water density, the measured liquid level cannot accurately reflect the produced oil volume, and it is even more impossible to distinguish the respective heights of oil and water in the storage tank. At the same time, when the storage tank contains both oil and water, its communicating vessel often contains only water, so that the liquid level in the communicating vessel is inconsistent with the actual liquid level in the storage tank. The staff cannot accurately obtain the liquid level in the storage tank through the liquid level gauge, and cannot obtain the accurate oil production. The error is about 35%, which can easily cause tank overflow accidents and pollute the environment.

[0003] Therefore, a technical solution is currently needed to solve the technical problem that the existing liquid level meter made using the communicating vessel principle cannot obtain accurate oil production and easily causes the liquid storage tank to overflow. Summary of the invention

[0004] The purpose of the invention is to provide a method for calculating the oil-water volume of a liquid storage tank, a measuring device and a liquid storage tank in view of the technical problem that the liquid level meter made by the communicating vessel principle in the prior art cannot obtain accurate oil production and easily causes overflowing of the liquid storage tank.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A method for calculating the oil-water volume of a liquid storage tank, the steps of which are as follows:

[0007] Step 1: Set up a liquid level measuring mechanism to measure the total height h of the liquid level in the liquid storage tank. 总 , set up a pressure measuring mechanism to measure the total pressure P of the liquid in the liquid storage tank;

[0008] Step 2: Calculate the height h of the water in the tank 水 and the oil height h 油 , the calculation formula is:

[0009] P = ρ 水 gh 水 +ρ 油 gh 油 and h 总 =h 水+h 油 , continue to derive the formula to get:

[0010] h 水 =(P – ρ 油 gh 总 ) / (ρ 水 g-ρ 油 g);

[0011] h 油 =h 总 -(P-ρ 油 gh 总 ) / (ρ 水 g-ρ 油 g);

[0012] Where: P-total pressure of liquid in the storage tank;

[0013] ρ 水 - Density of water in the tank;

[0014] h 水 - the height of the water in the tank;

[0015] ρ 油 - Density of the oil in the tank;

[0016] h 油 - Oil level in the reservoir;

[0017] h 总 -Total height of the liquid level in the tank;

[0018] g - acceleration due to gravity;

[0019] Step 3, according to h 总 Calculate the total volume V of the liquid in the tank 总 , according to h 水 Calculate the volume V of water in the tank 水 , according to V 总 and V 水 Calculate the volume V of the oil in the tank 油 , the calculation formula is:

[0020] V 油 =V 总 -V 水

[0021] Where: V 总 -Total volume of liquid in the tank;

[0022] V 水 -The volume of water in the tank;

[0023] V 油 -The volume of oil in the reservoir.

[0024] The present invention provides a method for calculating the oil-water volume of a liquid storage tank. By setting a liquid level measuring mechanism, the total height of the liquid surface in the liquid storage tank is measured. By setting a pressure measuring mechanism, the total pressure of the liquid in the liquid storage tank is measured. According to the liquid pressure formula P=ρ 水 gh 水 +ρ 油 gh 油 and h 总 =h 水 +h 油 Calculate the height h of the water in the tank 水 and the oil height h 油 Since the density of water is greater than that of oil, the water is located at the bottom of the tank. When the shape of the tank is constant, the height of the liquid inside corresponds to the volume of the liquid. Therefore, according to the height h of the water 水 The volume of water V can be directly calculated 水 , or find out the volume of water V according to the liquid storage tank volume conversion table 水 , according to the total height of the liquid level h 总 The total volume of the liquid V can be calculated 总 , from which the total height of the liquid level in the liquid storage tank h can be obtained respectively 总 , the volume of water V 水 , oil volume V 油 , realizing the monitoring of daily production volume in the liquid storage tank. During the measurement process, the liquid level measurement mechanism only needs to measure the liquid level height of a single medium oil. The measurement is simpler and more accurate. In addition, the total height of the liquid level can be measured directly to avoid tank overflow.

[0025] As a preferred solution of the present invention, the liquid level measuring mechanism includes a liquid level sensing component and a liquid level display component, and the liquid level sensing component and the liquid level display component are electrically connected. The total height of the liquid level is measured by the liquid level sensing component, and then the total height of the liquid level is directly displayed by the liquid level display component, so that the staff can obtain the liquid level information by observation and take corresponding measures in time according to the liquid level to avoid the tank overflowing phenomenon.

[0026] As a preferred embodiment of the present invention, the liquid level sensing component includes a measuring rod and a float, the float is slidably arranged on the measuring rod, the measuring rod is provided with a waveguide wire, the float is provided with a magnet ring, and the density of the float is lower than the density of the oil in the liquid storage tank. 油When the current propagates along the waveguide wire, a pulse current magnetic field will be generated around the waveguide wire. The float moves up and down as the oil level changes. When the pulse current magnetic field meets the magnetic ring magnetic field generated by the float, the magnetic field around the float changes, causing the waveguide wire made of magnetostrictive material to generate a torsional wave pulse at the position of the float. This pulse is transmitted back along the waveguide wire at a fixed speed and detected by the detection mechanism. By measuring the time difference between the pulse current and the torsional wave, the position of the float, that is, the position of the liquid level, can be accurately determined.

[0027] As a preferred solution of the present invention, the pressure measuring mechanism includes a pressure sensing component and a pressure display component, the pressure sensing component is arranged at the bottom of the liquid storage tank, and the pressure display component is electrically connected to the pressure sensing component. The pressure sensing component is arranged at the bottom of the liquid storage tank so that the pressure sensing component can measure the total pressure of the liquid in the liquid storage tank, and the pressure display component is arranged so that the staff can directly read the pressure data. Specifically, the pressure measuring mechanism uses a digital pressure gauge, model ACD-300.

[0028] A device for measuring the volume of oil and water in a liquid storage tank comprises a liquid level measuring mechanism and a pressure measuring mechanism. The liquid level measuring mechanism is used to measure the total height of the liquid surface in the liquid storage tank, and the pressure measuring mechanism is used to measure the total pressure of the liquid in the liquid storage tank.

[0029] The present invention discloses an oil-water volume measuring device for a liquid storage tank. The device measures the total height of a liquid surface in the liquid storage tank by setting a liquid level measuring mechanism, measures the total pressure of the liquid in the liquid storage tank by setting a pressure measuring mechanism, calculates the height of water and the height of oil according to the total height of the liquid surface and the total pressure of the liquid, and converts the total volume of the liquid and the volume of the water according to the total height of the liquid surface and the height of the water, thereby respectively obtaining the volume of the water and the volume of the oil in the liquid storage tank. During the measurement process, the liquid level measuring mechanism only needs to measure the liquid surface height of the single medium oil, so the measurement is simpler and more accurate, and the total height of the liquid surface is directly measured to avoid the tank overflow phenomenon.

[0030] A liquid storage tank comprises a liquid storage tank body, on which the above-mentioned liquid storage tank oil-water volume measuring device is provided.

[0031] The present invention provides a liquid storage tank. By arranging a liquid level measuring mechanism and a pressure measuring mechanism on the liquid storage tank body, the total height of the liquid surface and the total pressure of the liquid in the liquid storage tank body can be conveniently obtained directly on the liquid storage tank, which is convenient for calculating the volume of water and the volume of oil. Moreover, the liquid level measuring mechanism only needs to measure the liquid level height of the single medium oil, so the measurement is simpler and the measurement accuracy is higher. At the same time, the total height of the liquid surface can be directly measured to avoid the tank overflow phenomenon.

[0032] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0033] The present invention provides a method for calculating the volume of oil and water in a liquid storage tank. The method measures the total height of the liquid level in the liquid storage tank by setting a liquid level measuring mechanism, measures the total pressure of the liquid in the liquid storage tank by setting a pressure measuring mechanism, and directly calculates the volume of water and the volume of oil according to the total height of the liquid level and the total pressure of the liquid, thereby realizing the monitoring of the daily production volume in the liquid storage tank. During the measurement process, the liquid level measuring mechanism only needs to measure the liquid level height of the single medium oil, so the measurement is simpler and the measurement accuracy is higher. In addition, the total height of the liquid level is directly measured to avoid the tank overflow phenomenon. By comparing the actual tank opening measurement with the calculation result, the error is about 3%, which is much lower than the original 35%. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is an operation flow chart of a method for calculating the oil-water volume of a liquid storage tank according to the present invention;

[0035] Figure 2 It is a schematic diagram of the liquid storage tank body, the liquid level measuring mechanism and the pressure measuring mechanism and their connection relationship of the present invention;

[0036] Figure 3 It is a structural schematic diagram of the liquid level sensing component of the present invention;

[0037] Markings in the figure: 1-liquid level measuring mechanism, 11-liquid level sensing component, 111-measuring rod, 112-float, 113-waveguide wire, 114-magnet ring, 12-liquid level display component, 2-pressure measuring mechanism, 21-pressure sensing component, 22-pressure display component, 3-liquid storage tank body. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0039] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and 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.

[0040] Example 1

[0041] like Figure 1-Figure 3 As shown, in this embodiment, a method for calculating the oil-water volume of a liquid storage tank comprises the following steps:

[0042] Step 1: Set up the liquid level measuring mechanism 1 to measure the total height h of the liquid level in the liquid storage tank. 总 , a pressure measuring mechanism 2 is provided to measure the total pressure P of the liquid in the liquid storage tank;

[0043] Step 2: Calculate the height h of the water in the tank 水 and the oil height h 油 , the calculation formula is:

[0044] P = ρ 水 gh 水 +ρ 油 gh 油 and h 总 =h 水 +h 油

[0045] Where: P-total pressure of liquid in the storage tank;

[0046] ρ 水 - Density of water in the tank;

[0047] h 水 - the height of the water in the tank;

[0048] ρ 油 - Density of the oil in the tank;

[0049] h 油 - Oil level in the reservoir;

[0050] h 总 -Total height of the liquid level in the tank;

[0051] g - acceleration due to gravity;

[0052] Step 3, according to h 总 Calculate the total volume V of the liquid in the tank 总 , according to h 水 Calculate the volume V of water in the tank 水 , according to V 总 and V 水 Calculate the volume V of the oil in the tank 油 , the calculation formula is:

[0053] V 油 =V 总 -V 水

[0054] Where: V 总 -Total volume of liquid in the tank;

[0055] V 水 -The volume of water in the tank;

[0056] V 油 -The volume of oil in the reservoir.

[0057] When the shape of the liquid storage tank is determined, the total liquid pressure P and the total liquid level h 总 , total volume of liquid V 总 , the volume of water V 水 , oil volume V 油 As shown in Table 1-1:

[0058]

[0059] Table 1-1

[0060] Specifically, the liquid level measuring mechanism 1 includes a liquid level sensing component 11 and a liquid level display component 12, the liquid level sensing component 11 and the liquid level display component 12 are electrically connected, the total height of the liquid level is measured by the liquid level sensing component 11, and the total height of the liquid level is directly displayed by the liquid level display component 12, so that the staff can obtain the liquid level height information by observation, and take corresponding measures in time according to the liquid level height to avoid the tank overflow phenomenon; the liquid level sensing component 11 includes a measuring rod 111 and a float 112, the float 112 is slidably arranged on the measuring rod 111, the measuring rod 111 is provided with a waveguide wire 113, the float 112 is provided with a magnet ring 114, and the density of the float 112 is lower than the density ρ of the oil in the liquid storage tank 油 When the current propagates along the waveguide wire 113, a pulse current magnetic field is generated around the waveguide wire 113. The float 112 moves up and down as the oil level changes. When the pulse current magnetic field meets the magnetic ring magnetic field generated by the float 112, the magnetic field around the float 112 changes, causing the waveguide wire 113 made of magnetostrictive material to generate a torsional wave pulse at the position where the float 112 is located. This pulse is transmitted back along the waveguide wire 113 at a fixed speed and detected by the detection mechanism. By measuring the time difference between the pulse current and the torsional wave, the position of the float 112, that is, the position of the liquid level, can be accurately determined.

[0061] The pressure measuring mechanism 2 includes a pressure sensing component 21 and a pressure display component 22. The pressure sensing component 21 is arranged at the bottom of the liquid storage tank. The pressure display component 22 is electrically connected to the pressure sensing component 21. The pressure sensing component 21 is arranged at the bottom of the liquid storage tank so that the pressure sensing component 21 can measure the total pressure of the liquid in the liquid storage tank. The pressure display component 22 is arranged to facilitate the staff to directly read the pressure data. Specifically, the pressure measuring mechanism 2 uses a digital pressure gauge, model ACD-300.

[0062] The present invention provides a method for calculating the oil-water volume of a liquid storage tank. The method measures the total height of the liquid surface in the liquid storage tank by setting a liquid level measuring mechanism 1, and measures the total pressure of the liquid in the liquid storage tank by setting a pressure measuring mechanism 2. 水 gh 水 +ρ 油 gh 油 and h 总 =h 水 +h 油 Calculate the height h of the water in the tank 水 and the oil height h 油Since the density of water is greater than that of oil, the water is located at the bottom of the tank. When the shape of the tank is constant, the height of the liquid inside corresponds to the volume of the liquid. Therefore, according to the height h of the water 水 The volume of water V can be directly calculated 水 , or find out the volume of water V according to the liquid storage tank volume conversion table 水 , according to the total height of the liquid level h 总 The total volume of the liquid V can be calculated 总 , from which the total height of the liquid level in the liquid storage tank h can be obtained respectively 总 , the volume of water V 水 , oil volume V 油 , realizing the monitoring of daily production volume in the liquid storage tank. During the measurement process, the liquid level measuring mechanism 1 only needs to measure the liquid level height of a single medium oil, which is simpler and more accurate. In addition, the total height of the liquid level can be directly measured to avoid tank overflow.

[0063] Example 2

[0064] like Figure 2 As shown, in this embodiment, a device for measuring the volume of oil and water in a liquid storage tank includes a liquid level measuring mechanism 1 and a pressure measuring mechanism 2. The liquid level measuring mechanism 1 is used to measure the total height of the liquid level in the liquid storage tank, and the pressure measuring mechanism 2 is used to measure the total pressure of the liquid in the liquid storage tank.

[0065] By setting up a liquid level measuring mechanism 1, the total height of the liquid surface in the liquid storage tank is measured, and by setting up a pressure measuring mechanism 2, the total pressure of the liquid in the liquid storage tank is measured. The height of water and the height of oil are calculated according to the total height of the liquid surface and the total pressure of the liquid. The total volume of the liquid and the volume of the water are converted according to the total height of the liquid surface and the height of the water, thereby obtaining the volume of the water and the volume of the oil in the liquid storage tank respectively. During the measurement process, the liquid level measuring mechanism 1 only needs to measure the liquid surface height of the single medium oil, so the measurement is simpler and the measurement accuracy is higher. In addition, the total height of the liquid surface is directly measured to avoid the tank overflow phenomenon.

[0066] Example 3

[0067] like Figure 2 As shown, in this embodiment, a liquid storage tank includes a liquid storage tank body 3, and the liquid storage tank body 3 is provided with a liquid storage tank oil and water volume measuring device as described in Example 2.

[0068] By arranging a liquid level measuring mechanism 1 and a pressure measuring mechanism 2 on the liquid storage tank body, it is convenient to directly obtain the total height of the liquid level and the total pressure of the liquid in the liquid storage tank body 3 on the liquid storage tank, which is convenient for calculating the volume of water and the volume of oil. Moreover, the liquid level measuring mechanism 1 only needs to measure the liquid level height of a single medium oil, which makes the measurement simpler and more accurate. At the same time, the total height of the liquid level can be directly measured to avoid the occurrence of tank overflow.

[0069] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for calculating the oil-water volume of a liquid storage tank, characterized in that: include: Step 1: Set up a liquid level measuring mechanism (1) to measure the total height h of the liquid level in the liquid storage tank. 总 A pressure measuring mechanism (2) is provided to measure the total pressure P of the liquid in the liquid storage tank. The liquid level measuring mechanism (1) comprises a liquid level sensing component (11) and a liquid level display component (12). The liquid level sensing component (11) and the liquid level display component (12) are electrically connected. The liquid level sensing component (11) comprises a measuring rod (111) and a float (112). The float (112) is slidably arranged on the measuring rod (111). The measuring rod (111) is provided with a waveguide wire (113). The float (112) is provided with a magnet ring (114). The density of the float (112) is lower than the density ρ of the oil in the liquid storage tank. 油 The pressure measuring mechanism (2) comprises a pressure sensing component (21) and a pressure display component (22), wherein the pressure sensing component (21) is arranged at the bottom of the liquid storage tank, and the pressure display component (22) is electrically connected to the pressure sensing component (21); Step 2: Calculate the height h of the water in the tank 水 and the oil height h 油 , the calculation formula is: P = ρ 水 gh 水 +ρ 油 gh 油 and h 总 =h 水 +h 油 Where: P-total pressure of liquid in the storage tank; ρ 水 - Density of water in the tank; h 水 - the height of the water in the tank; ρ 油 - Density of the oil in the tank; h 油 - Oil level in the reservoir; h 总 -Total height of the liquid level in the tank; g - acceleration due to gravity; Step 3, according to h 总 Calculate the total volume V of the liquid in the tank 总 , according to h 水 Calculate the volume V of water in the tank 水 , according to V 总 and V 水 Calculate the volume V of the oil in the tank 油 , the calculation formula is: V 油 =V 总 -V 水 Where: V 总 -Total volume of liquid in the tank; V 水 -The volume of water in the tank; V 油 -The volume of oil in the reservoir.

2. A device for measuring the volume of oil and water in a liquid storage tank, characterized in that: The invention comprises a liquid level measuring mechanism (1) and a pressure measuring mechanism (2), wherein the liquid level measuring mechanism (1) is used to measure the total height of the liquid level in the liquid storage tank, and the pressure measuring mechanism (2) is used to measure the total pressure of the liquid in the liquid storage tank. The liquid level measuring mechanism (1) comprises a liquid level sensing component (11) and a liquid level display component (12), wherein the liquid level sensing component (11) and the liquid level display component (12) are electrically connected, and the liquid level sensing component (11) comprises a measuring rod (111) and a float (112), wherein the float (112) is slidably arranged on the measuring rod (111), wherein the measuring rod (111) is provided with a waveguide wire (113), and wherein the float (112) is provided with a magnet ring (114), and wherein the density of the float (112) is lower than the density ρ of the oil in the liquid storage tank. 油 The pressure measuring mechanism (2) comprises a pressure sensing component (21) and a pressure display component (22), the pressure sensing component (21) is arranged at the bottom of the liquid storage tank, and the pressure display component (22) is electrically connected to the pressure sensing component (21).

3. A liquid storage tank, characterized in that: It comprises a liquid storage tank body (3), on which is provided a liquid storage tank oil-water volume measuring device as claimed in claim 2.

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