CN116878614A - Vortex loss differential array type oil-water interface detection system and method - Google Patents

Abstract

The invention provides a vortex-loss differential array type oil-water interface detection system and a method, wherein the system comprises the following steps: the device comprises a middle pipe, a central pipe, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground host. According to the invention, through the difference of the conductivity of oil and water, the eddy current loss in the annular coil is changed by utilizing the high-conductivity liquid to change the inductance, so that the position of an oil-water interface is identified, and the limitation that the traditional distance measuring method can only detect the oil-gas interface but can not detect the oil-water interface is solved.

Description

An eddy loss differential array oil-water interface detection system and method

Technical field

The present invention relates to the technical field of oil and gas monitoring, and more specifically, to an eddy loss differential array oil-water interface detection system and method.

Background technique

Salt cavern gas storage is a gas storage formed by injecting brine or fresh water and other liquids into the salt cave cavity to dissolve and form a gas cavity. During the construction and use of the salt cavern gas storage, the casing structure of the intermediate pipe and the central pipe is drilled into the cavity to control the gas inflow and outflow. During this process, the surface of the liquid stored in the gas storage is covered with a layer of oil, and the gas-liquid interface is an oil-water mixing interface. During the gas storage production process, it is necessary to continuously monitor and control the height of the gas-liquid interface in the cavity. Improper control of the liquid level will cause the top of the salt cavern to dissolve, destroy its geometry, and weaken its ability to maintain pressure. At the same time, after the gas storage is built and put into use, strict sealing is required, and a permanent packer will be used on the central pipe. This device will prevent cables from entering the gas storage, making it difficult to use wired measurement methods.

In conventional wireless measurement solutions, signals such as acoustic waves and light waves are generally divided into two methods: measuring the signal round-trip time difference and measuring the electrical signal parameters associated with the liquid level downhole to obtain the distance between the liquid level and the device. However, this type of distance measurement method is greatly affected by the oil on the gas-liquid interface. It is generally measured as the interface between the gas and the oil layer, making it difficult to accurately locate the oil-water interface. On the other hand, acoustic signals and optical signals are easily affected by the high-temperature and high-pressure gas and the fluctuating oil-liquid interface in the gas storage (see Chinese invention patent CN111380594A); the electrical parameter method is often a contact measurement, and is affected by the high temperature, high pressure and environment of the underground well. The limitations have a greater impact. Generally, non-contact electrical parameter measurement has problems such as difficulty in constant current output due to the complex formation of downhole impedance (see Chinese patent CN202110470861.6). Therefore, how to provide an oil-water interface measurement method to improve the measurement accuracy of the oil-water interface is an issue that needs to be solved urgently.

Contents of the invention

In view of the technical problems existing in the prior art, the present invention provides an eddy loss differential array oil-water interface detection system and method. Its purpose is to use a coil structure composed of four groups of hollow annular coils of the same structural material to achieve detection of gas storage in gas storage tanks. The non-contact monitoring of the oil-water interface is based on the fact that liquids such as oil and brine can enter the spiral hollow space, but only the brine can change the size of the eddy current loss and thus change the design of the output electrical signal, thereby realizing the monitoring of the oil-water interface.

A first aspect of the invention provides an eddy loss differential array oil-water interface detection system, including: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground The main machine, the central tube and the intermediate tube have a nested structure, the central tube is placed in the intermediate tube, and each oil-water interface detection device, each coil structure and each voltage signal monitoring device are jointly installed on each On the same outer wall of the central tube, the oil-water interface detection device is electrically connected to the coil structure, the coil structure is electrically connected to the voltage signal monitoring device, and the ground host is respectively connected to the oil-water interface detection device and the coil structure. The voltage signal monitoring device is connected through communication;

The ground host is used to receive control instructions input by the user, issue work instructions to the oil-water interface detection device based on the control instructions, receive the electrical signal group returned by the voltage signal monitoring device, and based on the electrical signals The group calculates the depth of the oil-water interface;

The oil-water interface detection device is used to send measurement electrical signals to the coil structure based on the work instructions sent by the ground host;

The coil structure is used to output an electrical signal value based on the measured electrical signal;

The voltage signal monitoring device is used to monitor the coil structure, collect the electrical signal value, construct the electrical signal group based on the electrical signal value, and return the electrical signal group to the ground host .

On the basis of the above technical solution, the present invention can also make the following improvements.

Preferably, the installation position of the oil-water interface detection device, the coil structure and the voltage signal monitoring device in the central tube is set according to the preset liquid level detection accuracy.

Preferably, the measurement electrical signal is an alternating current electrical signal.

Preferably, the coil structure is four groups of ring coils [L ₁ , L ₂ , L ₃ , L ₄ ], wherein the structures and materials of the four groups of ring coils are the same.

Preferably, the entire coils of the annular coils [L ₂ , L ₃ ] in the coil structure are fixed with plastic packaging materials, and the coils of the annular coils [L ₁ , L ₄ ] in the coil structure are fixed with plastic packaging materials, and are A spiral hollow space is provided in the gap between adjacent turns, and the spiral hollow space is connected to the outside to allow external gas and/or liquid to enter the spiral hollow space.

Preferably, when the external air enters the spiral hollow space, the inductances of the annular coils [L ₁ , L ₂ , L ₃ , L ₄ ] are equal; when the external liquid enters the spiral hollow space space, the inductances of the toroidal coils [L ₁ , L ₄ ] are equal, the inductances of the toroidal coils [L ₂ , L ₃ ] are equal, and the inductances of the toroidal coils [L ₁ , L ₄ ] are equal The inductance of the toroidal coil [L ₂ , L ₃ ] is not equal.

A second aspect of the present invention provides an eddy loss differential array oil-water interface detection method, which is applied to the eddy loss differential array oil-water interface detection system. The system includes: an intermediate tube, a central tube, and at least one oil-water interface. An interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground host;

The eddy loss differential array oil-water interface detection method includes the following steps:

During the process of the central pipe descending to the salt cavern gas storage, the surface host sends work instructions to the oil-water interface detection device;

The oil-water interface detection device sends an alternating current signal to the coil structure based on the work instruction;

The voltage signal monitoring device collects the electrical signal value output by the coil structure, calculates the effective value of the electrical signal based on the electrical signal value and constructs the electrical signal group, and returns the electrical signal group to the ground host;

The ground host computer calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group.

Preferably, the step of calculating the liquid level depth of the salt cavern gas storage by the ground host based on the electrical signal group includes:

The ground host obtains the numerical mutation point p in the electrical signal group, obtains the installation position of the corresponding oil-water interface detection device based on the mutation point p, and sets the installation position to the salt cavern gas storage liquid level depth.

Preferably, the effective value U _i of the electrical signal is:

in, is the alternating current signal sent by the oil-water interface detection device, Z ₁ , Z ₂ , Z ₃ and Z ₄ are the reactance values of the toroidal coil [L ₁ , L ₂ , L ₃ , L ₄ ] respectively, i is the voltage signal monitoring device Serial number,/> is the electrical signal value output by the coil structure.

Preferably, the judgment conditions for the numerical mutation point p are:

in, is a universal quantifier,/> is any U _k , k and p are the serial numbers of the electrical signal group respectively, and U _c is the electrical signal value output when the spiral hollow space in the coil structure enters the liquid/>

The invention provides an eddy loss differential array oil-water interface detection system and method. The system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground host. The above-mentioned central tube and the above-mentioned intermediate tube have a nested structure. The above-mentioned central tube is placed in the above-mentioned intermediate tube. Each oil-water interface detection device, each coil structure and each voltage signal monitoring device are jointly installed on the same outer wall of the above-mentioned central tube. The above-mentioned oil-water interface detection device is electrically connected to the above-mentioned coil structure, the above-mentioned coil structure is electrically connected to the above-mentioned voltage signal monitoring device, and the above-mentioned ground host is communicatively connected to the above-mentioned oil-water interface detection device and the above-mentioned voltage signal monitoring device respectively; the above-mentioned ground host is After receiving the control command input by the user, issuing a work command to the above-mentioned oil-water interface detection device based on the above-mentioned control command, receiving the electrical signal group returned by the above-mentioned voltage signal monitoring device, and calculating the depth of the oil-water interface based on the above-mentioned electrical signal group; the above-mentioned oil-water interface The detection device is used to send measurement electrical signals to the above-mentioned coil structure based on the work instructions sent by the above-mentioned ground host; the above-mentioned coil structure is used to output electrical signal values based on the above-mentioned measurement electrical signals; the above-mentioned voltage signal monitoring device is used to detect the above-mentioned The coil structure is monitored, the electrical signal value is collected, the electrical signal group is constructed based on the electrical signal value, and the electrical signal group is returned to the ground host. This invention uses high conductivity liquid to change the eddy current loss in the annular coil and change the inductance through the difference in conductivity between oil and water, thereby identifying the position of the oil-water interface and solving the limitation that traditional ranging methods can only detect the oil-gas interface but cannot detect the oil-water interface. , while achieving wireless ranging and wireless transmission under underground pressure operations.

Description of the drawings

Figure 1 is a schematic structural diagram of an eddy loss differential array oil-water interface detection system provided by the present invention;

Figure 2 is a schematic diagram of the coil part in the eddy loss differential array oil-water interface detection system provided by the present invention;

Figure 3 is a flow chart of an eddy loss differential array oil-water interface detection method provided by the present invention;

Figure 4 is a schematic diagram of the hardware structure of a possible electronic device provided by the present invention;

Figure 5 is a schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention.

The numbers in each drawing are: 1-ground host; 2-intermediate pipe; 3-central pipe; 4-oil-water interface detection device; 5-coil structure; 6-voltage signal monitoring device; 7-oil layer in the well; 8-liquid in the well ;9-Gas in the well.

Detailed ways

Specific implementations of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate the invention but are not intended to limit the scope of the invention.

Figure 1 is a schematic structural diagram of an eddy loss differential array oil-water interface detection system provided by the present invention. As shown in Figure 1, the system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one The coil structure, at least one voltage signal monitoring device and the ground host, the central tube and the intermediate tube are nested structures, the central tube is placed in the intermediate tube, each oil-water interface detection device, each coil structure Each voltage signal monitoring device is installed on the same outer wall of the central tube, the oil-water interface detection device is electrically connected to the coil structure, and the coil structure is electrically connected to the voltage signal monitoring device. The ground host is communicatively connected to the oil-water interface detection device and the voltage signal monitoring device respectively.

Wherein, the ground host is used to receive control instructions input by the user, issue work instructions to the oil-water interface detection device based on the control instructions, receive the electrical signal group returned by the voltage signal monitoring device, and based on the The electrical signal group calculates the depth of the oil-water interface; the oil-water interface detection device is used to send measuring electrical signals to the coil structure based on the work instructions sent by the ground host; the coil structure is used to send measuring electrical signals based on the measured electrical signals. signal to output an electrical signal value; the voltage signal monitoring device is used to monitor the coil structure, collect the electrical signal value, construct the electrical signal group based on the electrical signal value, and convert the electrical signal The group returns to the ground host.

It can be understood that the above-mentioned oil-water interface detection device, the above-mentioned coil structure and the above-mentioned voltage signal monitoring device are continuous pipes in the middle pipe, which are used to connect the ground and the underground production layer of the salt cavern gas storage.

It should be understood that the central pipe is a continuous pipe, which is lowered into the interior of the intermediate pipe and has a nested structure with the intermediate pipe for connecting the production layer and the ground. The upper end is connected to the ground, and the lower end is submerged into the underground production layer.

Further, the measured electrical signal is an alternating current signal.

Further, the above-mentioned oil-water interface detection device, the above-mentioned coil structure and the above-mentioned voltage signal monitoring device include at least one in this embodiment, and each oil-water interface detection device, each coil structure and each voltage signal monitoring device are electrically connected, And installed side by side on the outer wall of the above-mentioned central tube.

Further, the installation position of the oil-water interface detection device, the coil structure and the voltage signal monitoring device in the central tube is set according to the preset liquid level detection accuracy.

It can be understood that the installation positions of the above-mentioned oil-water interface detection device, the above-mentioned coil structure and the above-mentioned voltage signal monitoring device are set according to the preset liquid level detection accuracy. When there are multiple oil-water interface detection devices, multiple coil structures and multiple voltages, The signal monitoring device is distributed on the outer wall of the above-mentioned central tube. The distance between the adjacent oil-water interface detection device, coil structure and voltage signal monitoring is a fixed value, and the above fixed value is also based on the preset liquid level detection accuracy. Settings, the above-mentioned presets and detection accuracy can be set by the designer during the initial design of the system.

Further, the coil structure is four groups of ring coils [L ₁ , L ₂ , L ₃ , L ₄ ], wherein the structures and materials of the four groups of ring coils are the same.

It can be understood that the above-mentioned coil structure includes four groups of ring-shaped coils with a number of turns N and installed in the same plane position and having the same structure and material. See Figure 2 for the installation structure.

Further, the entire coils of the annular coils [L ₂ , L ₃ ] in the coil structure are fixed with plastic sealing materials, and the coils of the annular coils [L ₁ , L ₄ ] in the coil structure are fixed with plastic sealing materials, and are placed on the A spiral hollow space is provided in the gap between adjacent turns, and the spiral hollow space is connected to the outside to allow external gas and/or liquid to enter the spiral hollow space.

It can be understood that there is no electrical contact between the above-mentioned spiral hollow space and the coil because the coil is plastic-sealed.

Further, when the external air enters the spiral hollow space, the inductances of the toroidal coils [L ₁ , L ₂ , L ₃ , L ₄ ] are equal; when the external liquid enters the spiral hollow space space, the inductances of the toroidal coils [L ₁ , L ₄ ] are equal, the inductances of the toroidal coils [L ₂ , L ₃ ] are equal, and the inductances of the toroidal coils [L ₁ , L ₄ ] are equal The inductance of the toroidal coil [L ₂ , L ₃ ] is not equal.

It can be understood that when the above-mentioned coil structure is submerged in the liquid in the above-mentioned central tube, since the liquid enters the above-mentioned spiral hollow space, the inductance of the above-mentioned toroidal coil [L ₁ , L 4 ] is changed. Therefore, the inductance of the toroidal coil [L 1 , L ₄ ] is changed. L ₁ , L ₄ ] and the toroidal coil [L ₂ , L ₃ ] have different inductances.

It can be understood that based on the defects in the background technology, embodiments of the present invention propose an eddy loss differential array oil-water interface detection system. The system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground host. The above-mentioned central tube and the above-mentioned intermediate tube are in a nested structure, and the above-mentioned central tube is placed in the above-mentioned middle In the pipe, each oil-water interface detection device, each coil structure and each voltage signal monitoring device are installed on the same outer wall of the above-mentioned central tube. The above-mentioned oil-water interface detection device is electrically connected to the above-mentioned coil structure, and the above-mentioned coil structure is electrically connected to the above-mentioned coil structure. The voltage signal monitoring device is electrically connected, and the above-mentioned ground host is communicatively connected to the above-mentioned oil-water interface detection device and the above-mentioned voltage signal monitoring device; the above-mentioned ground host is used to receive control instructions input by the user, and based on the above-mentioned control instructions, send signals to the above-mentioned oil-water interface detection device. Send work instructions, receive the electrical signal group returned by the above-mentioned voltage signal monitoring device, and calculate the depth of the oil-water interface based on the above-mentioned electrical signal group; the above-mentioned oil-water interface detection device is used to send to the above-mentioned coil structure based on the work instructions sent by the above-mentioned ground host. Measuring electrical signals; the above-mentioned coil structure is used to output an electrical signal value based on the above-mentioned measured electrical signal; the above-mentioned voltage signal monitoring device is used to monitor the above-mentioned coil structure, collect the above-mentioned effective value of the electrical signal, and construct based on the above-mentioned effective value of the electrical signal The above-mentioned electrical signal group is returned to the above-mentioned ground host. This invention uses high conductivity liquid to change the eddy current loss in the annular coil and change the inductance through the difference in conductivity between oil and water, thereby identifying the position of the oil-water interface and solving the limitation that traditional ranging methods can only detect the oil-gas interface but cannot detect the oil-water interface. , while realizing wireless ranging and wireless transmission under underground pressurized operations. At the same time, monitoring the gas-liquid interface is achieved by monitoring the changes in inductance of two different structures in the same location, thereby realizing non-contact gas-liquid interface based on electrical parameter measurement. Liquid interface measurement solves the problem of traditional electrical parameter measurement being limited by the high pressure and high temperature environment of the gas storage due to the need for direct contact with the liquid level.

In one possible application scenario, _the ground host sends work instructions to each oil-water interface _detection device downhole, and the oil-water interface _monitoring device array [Y ₁ Y ₂ ... Y _n ] start up and work, and connect the measured electrical signal to the coil structure corresponding to the oil-water interface monitoring device. The voltage signal monitoring device [D ₁ D ₂ … D _n ] collects the output electrical signal value group [U ₁ U ₂ … U _n ] generated by the above coil; the voltage signal monitoring device will obtain the data according to the format of electrical signal-device name Reorganized into an electrical signal group [(U ₁ ,Y ₁ )(U ₂ ,Y ₂ )...(U _n ,Y _n )]. Since the oil-water interface detection device applies an alternating current signal, the coil structure is submerged in the liquid. When, the electrical signal changes; after receiving the above electrical signal group, the ground host finds the mutation point U _p of the value in the output electrical signal group [U ₁ U ₂ ... U _n ], and determines the oil-water interface according to the Y _p corresponding to U _p The height H.

It can be understood that the above-mentioned predetermined depth _Hi (i=1,2...n) expresses the distance between the measurement structure in the corresponding oil-water interface detection device Yi ( _i =1,2...n) and the ground. At the same time, the predetermined depth satisfies H ₁ <H ₂ <…<H _n .

It should be understood that the spacing between adjacent devices in the above oil-water interface monitoring device array is a fixed value, that is, H _m+1 -H _m =ΔH (m=1,2...n-1), and the value of ΔH depends on the liquid. Accuracy requirements for surface monitoring.

It can also be understood that the above-mentioned coil structure is four groups of coils. When the above-mentioned coils are not immersed in the liquid, their corresponding four inductance values satisfy L ₁ =L ₂ =L ₃ =L ₄ . When the above-mentioned coils are immersed in the liquid, the liquid Entering [L ₁ L ₄ ] in the coil structure, the corresponding four inductance values L ₁ =L ₄ ≠L ₂ =L ₃ .

In this embodiment, the high conductivity brine liquid in the gas storage is used to change the magnetic permeability of the annular hollow inductor, and the gas-liquid interface is monitored by monitoring the inductance changes of two different structure inductors at the same position, thereby achieving electrical parameter measurement. The non-contact gas-liquid interface measurement solves the problem of traditional electrical parameter measurement being limited by the high pressure and high temperature environment of the gas storage due to the need for direct contact with the liquid level.

In a possible application scenario, the number of oil-water interface detection devices, coil structures and voltage signal monitoring devices are all 3, that is, 3 oil-water interface detection devices [Y ₁ Y ₂ Y ₃ ], 3 voltage signal monitoring devices Device [D ₁ D ₂ D ₃ ], the predetermined depth of installation of the above oil-water interface detection device, coil structure and voltage signal monitoring device is [H ₁ = 20m H ₂ = 25m H ₃ = 30m], the oil-water interface detection device input voltage The signal is The frequency of the sinusoidal electrical signal is 10kHz. The voltage signal monitoring device collects the output electrical signal value set generated by the coil structure as [U ₁ U ₂ U ₃ ].

Furthermore, when the inductance in the above coil results does not enter the liquid, the reactance of the entire loop inductance [L ₁ L ₂ L ₃ L ₄ ] is 10Ω under a sinusoidal electrical signal with a frequency of 10kHz, that is, Z ₁ = Z ₄ =Z ₂ =Z ₃ =10Ω.

Further, the voltage signal monitoring device reconstructs the collected data according to the output electrical signal-device name, and the obtained data group is [(U ₁ ,Y ₁ )(U ₂ ,Y ₂ )(U ₃ ,Y ₃ )] .

Further, the oil-water interface liquid level is set to be 22m away from the ground, that is, between Y ₁ and Y _2. At this time, Y ₂ and Y ₃ are both submerged by the liquid level, and Y ₁ is not submerged. The liquid in the well enters the hollow part of the inductance [L ₁ L ₄ ] in Y ₂ and Y ₃ , causing the reactance value corresponding to the inductance to change. Assume that Z ₁ =Z ₄ =20Ω at this time.

Further, the voltage signal monitoring device [D ₁ D ₂ D ₃ ] collected the output electrical signal value set generated by the coil structure as [U ₁ =0V U ₂ =1.1783VU ₃ =1.1783V].

Further, the judgment is made based on the judgment conditions of the mutation point p:

It can be seen that p=2 satisfies the condition, that is, U ₂ is the mutation point, and the real-time oil level H in the salt cavern gas storage is between H ₂ and H ₁ , with an error of 5m. The above calculation results are consistent with the assumptions of this embodiment, and the liquid level is between Y ₁ and Y ₂ .

In this embodiment, a coil structure composed of four sets of hollow ring coils of the same structural material is used to realize non-contact monitoring of the oil-water interface in the gas storage. Liquids such as oil and brine can enter the spiral hollow space, but only brine can. Changing the size of the eddy current loss changes the design of the output electrical signal to achieve monitoring of the oil-water interface.

Please refer to Figure 3. Figure 3 is a flow chart of an eddy loss differential array oil-water interface detection method provided by the present invention according to an embodiment of the present invention. As shown in Figure 3, an eddy loss differential array oil-water interface detection method is provided. Interface detection method, applied to the eddy loss differential array oil-water interface detection system, the system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and the ground Host, methods include:

Step S100: During the process of the central pipe descending to the salt cave gas storage, the surface host sends a work command to the oil-water interface detection device;

Step S200: The oil-water interface detection device sends an alternating current signal to the coil structure based on the work instruction;

Step S300: The voltage signal monitoring device collects the electrical signal value output by the coil structure, calculates the effective value of the electrical signal based on the electrical signal value and constructs the electrical signal group, and returns the electrical signal group to the Ground host;

Further, the effective value U _i of the electrical signal is:

in, is the alternating current signal sent by the oil-water interface detection device, Z ₁ , Z ₂ , Z ₃ and Z ₄ are the reactance values of the toroidal coil [L ₁ , L ₂ , L ₃ , L ₄ ] respectively, i is the voltage signal monitoring device Serial number,/> is the electrical signal value output by the coil structure.

Step S400: The ground host computer calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group.

Further, the step of calculating the liquid level depth of the salt cavern gas storage by the ground host based on the electrical signal group includes:

Step S401: The ground host obtains a numerical mutation point p in the electrical signal group, obtains the installation position of the corresponding oil-water interface detection device based on the mutation point p, and sets the installation position to the salt cave. The liquid level depth of the gas storage tank.

Further, the judgment conditions for the numerical mutation point p are:

in, is a universal quantifier,/> is any U _k , k and p are the serial numbers of the electrical signal group respectively, and U _c is the electrical signal value output when the spiral hollow space in the coil structure enters the liquid/>

It can be understood that the eddy loss differential array oil-water interface detection method provided by the present invention corresponds to the eddy loss differential array oil-water interface detection system provided by the foregoing embodiments. The eddy loss differential array oil-water interface detection system The relevant technical features of the method can be referred to the relevant technical features of the eddy loss differential array oil-water interface detection system, which will not be described again here.

Please refer to FIG. 4 , which is a schematic diagram of an electronic device according to an embodiment of the present invention. As shown in Figure 4, an embodiment of the present invention provides an electronic device, including a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and executable on the processor 1320. The processor 1320 executes the computer program 1311 Follow these steps:

During the process of the central pipe descending to the salt cavern gas storage, the surface host sends a work instruction to the oil-water interface detection device; the oil-water interface detection device sends a communication message to the coil structure based on the work instruction. Electrical signal; the voltage signal monitoring device collects the electrical signal value output by the coil structure, calculates the effective value of the electrical signal based on the electrical signal value and constructs the electrical signal group, and returns the electrical signal group to the Ground host; the ground host calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group.

Please refer to FIG. 5 , which is a schematic diagram of an embodiment of a computer-readable storage medium provided by the present invention. As shown in Figure 5, this embodiment provides a computer-readable storage medium 1400 on which a computer program 1411 is stored. When the computer program 1411 is executed by a processor, the following steps are implemented:

During the process of the central pipe descending to the salt cavern gas storage, the surface host sends a work instruction to the oil-water interface detection device; the oil-water interface detection device sends a communication message to the coil structure based on the work instruction. Electrical signal; the voltage signal monitoring device collects the electrical signal value output by the coil structure, calculates the effective value of the electrical signal based on the electrical signal value and constructs the electrical signal group, and returns the electrical signal group to the Ground host; the ground host calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group.

An embodiment of the present invention provides an eddy loss differential array oil-water interface detection system. The system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and a ground host. The above-mentioned central tube and the above-mentioned intermediate tube are in a nested structure, and the above-mentioned central tube is placed in the above-mentioned middle In the pipe, each oil-water interface detection device, each coil structure and each voltage signal monitoring device are installed on the same outer wall of the above-mentioned central tube. The above-mentioned oil-water interface detection device is electrically connected to the above-mentioned coil structure, and the above-mentioned coil structure is electrically connected to the above-mentioned coil structure. The voltage signal monitoring device is electrically connected, and the above-mentioned ground host is communicatively connected to the above-mentioned oil-water interface detection device and the above-mentioned voltage signal monitoring device; the above-mentioned ground host is used to receive control instructions input by the user, and based on the above-mentioned control instructions, send signals to the above-mentioned oil-water interface detection device. Send work instructions, receive the electrical signal group returned by the above-mentioned voltage signal monitoring device, and calculate the depth of the oil-water interface based on the above-mentioned electrical signal group; the above-mentioned oil-water interface detection device is used to send to the above-mentioned coil structure based on the work instructions sent by the above-mentioned ground host. Measuring electrical signals; the above-mentioned coil structure is used to output an electrical signal value based on the above-mentioned measured electrical signal; the above-mentioned voltage signal monitoring device is used to monitor the above-mentioned coil structure, collect the above-mentioned effective value of the electrical signal, and construct based on the above-mentioned effective value of the electrical signal The above-mentioned electrical signal group is returned to the above-mentioned ground host. This invention uses high conductivity liquid to change the eddy current loss in the annular coil and change the inductance through the difference in conductivity between oil and water, thereby identifying the position of the oil-water interface and solving the limitation that traditional ranging methods can only detect the oil-gas interface but cannot detect the oil-water interface. , while realizing wireless ranging and wireless transmission under underground pressurized operations. At the same time, monitoring the gas-liquid interface is achieved by monitoring the changes in inductance of two different structures in the same location, thereby realizing non-contact gas-liquid interface based on electrical parameter measurement. Liquid interface measurement solves the problem of traditional electrical parameter measurement being limited by the high pressure and high temperature environment of the gas storage due to the need for direct contact with the liquid level.

It should be noted that in the above embodiments, each embodiment has its own emphasis in description. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each process and/or block in the flowchart illustrations and/or block diagrams, and combinations of processes and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device produce a machine for A device that implements the functions specified in a process or processes in a flowchart and/or in a block or blocks in a block diagram.

These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction means, the instructions The device implements the functions specified in a process or processes of the flowchart and/or a block or blocks of the block diagram.

These computer program instructions may also be loaded onto a computer or other programmable data processing device, causing a series of operating steps to be performed on the computer or other programmable device to produce computer-implemented processing, thereby executing on the computer or other programmable device. Instructions provide steps for implementing the functions specified in a process or processes of a flowchart diagram and/or a block or blocks of a block diagram.

Although the preferred embodiments of the present invention have been described, those skilled in the art will be able to make additional changes and modifications to these embodiments once the basic inventive concept is understood. Therefore, it is intended that the appended claims be construed to include the preferred embodiments and all changes and modifications that fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the invention. In this way, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims (10)

1. An eddy loss differential array oil-water interface detection system, characterized in that the system includes: an intermediate tube, a central tube, at least one oil-water interface detection device, at least one coil structure, at least one voltage signal monitoring device and the ground The main machine, the central tube and the intermediate tube have a nested structure, the central tube is placed in the intermediate tube, and each oil-water interface detection device, each coil structure and each voltage signal monitoring device are jointly installed on each On the same outer wall of the central tube, the oil-water interface detection device is electrically connected to the coil structure, the coil structure is electrically connected to the voltage signal monitoring device, and the ground host is respectively connected to the oil-water interface detection device and the coil structure. The voltage signal monitoring device is connected through communication; The ground host is used to receive control instructions input by the user, issue work instructions to the oil-water interface detection device based on the control instructions, receive the electrical signal group returned by the voltage signal monitoring device, and based on the electrical signals The group calculates the depth of the oil-water interface; The oil-water interface detection device is used to send measurement electrical signals to the coil structure based on the work instructions sent by the ground host; The coil structure is used to output an electrical signal value based on the measured electrical signal; The voltage signal monitoring device is used to monitor the coil structure, collect the electrical signal value, construct the electrical signal group based on the electrical signal value, and return the electrical signal group to the ground host . 2. The eddy loss differential array oil-water interface detection system according to claim 1, characterized in that the oil-water interface detection device, the coil structure and the voltage signal monitoring device are installed at the installation position of the central tube. Set according to the preset liquid level detection accuracy. 3. The eddy loss differential array oil-water interface detection system according to claim 1, characterized in that the measurement electrical signal is an alternating current signal. 4. The eddy loss differential array oil-water interface detection system according to claim 1, characterized in that the coil structure is four groups of annular coils [L ₁ , L ₂ , L ₃ , L ₄ ], wherein the The above four groups of toroidal coils have the same structure and material. 5. The eddy loss differential array oil-water interface detection system according to claim 4, characterized in that the entire coil of the annular coil [L ₂ , L ₃ ] in the coil structure is fixed with a plastic sealing material, and the coil The coils of the toroidal coils [L ₁ , L ₄ ] in the structure are fixed with plastic packaging materials, and a spiral hollow space is provided in the gap between adjacent turns. The spiral hollow space is connected to the outside to allow external gas and/or Or liquid enters the spiral hollow space. 6. The eddy loss differential array oil-water interface detection system according to claim 5, characterized in that when the external gas enters the spiral hollow space, the annular coil [L ₁ , L ₂ , L ₃ , L ₄ ] are equal; when the external liquid enters the spiral hollow space, the inductances of the ring coils [L ₁ , L ₄ ] are equal, and the ring coils [L ₂ , L ₃ ] are equal, and the inductances of the ring coils [L ₁ , L ₄ ] are not equal to the inductances of the ring coils [L ₂ , L ₃ ]. 7. An eddy loss differential array oil-water interface detection method, characterized in that it is applied to the eddy loss differential array oil-water interface detection system. The system includes: an intermediate tube, a central tube, and at least one oil-water interface detection system. device, at least one coil structure, at least one voltage signal monitoring device and a ground host; The eddy loss differential array oil-water interface detection method includes the following steps: During the process of the central pipe descending to the salt cavern gas storage, the surface host sends work instructions to the oil-water interface detection device; The oil-water interface detection device sends an alternating current signal to the coil structure based on the work instruction; The voltage signal monitoring device collects the electrical signal value output by the coil structure, calculates the effective value of the electrical signal based on the electrical signal value and constructs the electrical signal group, and returns the electrical signal group to the ground host; The ground host computer calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group. 8. The eddy loss differential array oil-water interface detection system according to claim 7, characterized in that the ground host calculates the liquid level depth of the salt cavern gas storage based on the electrical signal group, include: The ground host obtains the numerical mutation point p in the electrical signal group, obtains the installation position of the corresponding oil-water interface detection device based on the mutation point p, and sets the installation position to the salt cavern gas storage liquid level depth. 9. The eddy loss differential array oil-water interface detection system according to claim 7, characterized in that the effective value U _i of the electrical signal is: in, is the alternating current signal sent by the oil-water interface detection device, Z ₁ , Z ₂ , Z ₃ and Z ₄ are the reactance values of the toroidal coil [L ₁ , L ₂ , L ₃ , L ₄ ] respectively, i is the voltage signal monitoring device Serial number,/> is the electrical signal value output by the coil structure. 10. The eddy loss differential array oil-water interface detection system according to claim 8, characterized in that the judgment condition of the numerical mutation point p is: in, is a universal quantifier,/> is any U _k , k and p are the serial numbers of the electrical signal group respectively, and U _c is the electrical signal value output when the spiral hollow space in the coil structure enters the liquid/>