CN116878613B - Differential type projection mutual capacitance type oil-water interface monitoring system and method - Google Patents
Differential type projection mutual capacitance type oil-water interface monitoring system and method Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 238000012544 monitoring process Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 150000003839 salts Chemical class 0.000 claims abstract description 46
- 238000009434 installation Methods 0.000 claims abstract description 18
- 238000012360 testing method Methods 0.000 claims description 37
- 239000003990 capacitor Substances 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 15
- 239000011810 insulating material Substances 0.000 claims description 7
- 238000004891 communication Methods 0.000 claims description 6
- 239000004047 hole gas Substances 0.000 claims 2
- 230000007613 environmental effect Effects 0.000 abstract description 6
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- 230000004075 alteration Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
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- 238000007599 discharging Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- 238000007789 sealing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/26—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields
- G01F23/263—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring variations of capacity or inductance of capacitors or inductors arising from the presence of liquid or fluent solid material in the electric or electromagnetic fields by measuring variations in capacitance of capacitors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention provides a differential type projection mutual capacitance type oil-water interface monitoring system and a method, wherein the system comprises the following steps: the device comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host. According to the invention, the initial current and the working current of the upper receiving electrode and the lower receiving electrode are measured, and the installation positions of the transmitting electrode, the upper receiving electrode and the lower receiving electrode are combined, so that the influence of the bottom hole temperature and the pressure environmental factors is reduced, meanwhile, the influence of the oil layer floating above the liquid on the monitoring result can be ignored by utilizing the property that the dielectric constant of the gas in the salt cavern gas storage is similar to that of the oil layer and the dielectric constant of the bottom liquid is greatly different, and meanwhile, the sensor is not directly contacted with the bottom liquid in the salt cavern gas storage, so that the corrosion of the bottom liquid to the sensor is greatly reduced, the sensor is durable, and the depth of an oil-water interface in the salt cavern gas storage is measured with low cost.
Description
Technical Field
The invention relates to the technical field of salt cavern gas storage, in particular to a differential type projection mutual capacitance type oil-water interface monitoring system and method.
Background
The salt cavern gas storage is built by taking salt mine as a solution cavity gas storage mode through a fresh water injection mode, and the process comprises the following steps: downwards driving into pipelines such as a central pipe, a middle pipe, a sleeve pipe and the like through drilling; dissolving by injecting fresh water, discharging liquid at the bottom of the gas storage by a drain pipe, and injecting isolating liquid into a gap between a water injection pipe and a sleeve to avoid top dissolution; and continuously adjusting parameters according to technical parameters such as the salinity of liquid at the bottom of the gas storage, and controlling the geometric shape and the volume of the underground cavity, so as to finally obtain the gas storage meeting the design requirements. During the construction and use process, the gas-liquid interface height must be controlled and regulated to control the shape of the top plate of the dissolution cavity, for example, improper control can dissolve the top of the cavity, destroy the geometric shape of the cavity and weaken the pressure maintaining capacity of the cavity. Meanwhile, after the gas storage is built and put into use, strict sealing is required, a permanent packer is used on the central pipe, so that a wired measurement method which can be used in the building process can not be used, and meanwhile, the underground environment condition is more severe, and the existing measurement method and device are difficult to meet the requirements.
In patent CN201711050272.2, "measuring method and device of gas-liquid interface depth of salt cavern gas storage", a method and device of liquid level measurement of salt cavern gas storage are related, which use sensors and cables to realize real-time continuous and large-scale monitoring of gas-liquid depth interface, but because the measurement uses wired cables for sensor installation and signal transmission, the problem of gas leakage is easy to cause, and the method and device are only suitable for gas-liquid interface distance measurement in the environment without permanent packer in the gas storage construction period.
In a patent CN202010233971.6, "a method and a system for measuring a gas-liquid interface of a salt cavern gas storage based on a sound velocity difference", an ultrasonic signal is used as a ranging signal, and the liquid level measurement is performed by measuring an ultrasonic transmitting-receiving time difference; in patent CN201921840592.2, "a gas-liquid interface measuring device for salt cavern gas storage", a laser signal is used as a ranging signal, which measures the liquid level by measuring the laser emission-reception time difference. The wireless distance measurement is realized by the two methods, but only the depth of a gas-liquid interface can be measured, and the position of an oil-water interface cannot be further distinguished. Therefore, how to measure the oil-water interface position in the salt cavern gas storage is a problem to be solved.
Disclosure of Invention
The invention provides a differential type projection mutual capacitance type oil-water interface monitoring system and a differential type projection mutual capacitance type oil-water interface monitoring method aiming at the technical problems in the prior art, which are used for solving the problem of how to measure the oil-water interface position in a salt cavern gas storage.
In a first aspect of the present invention, a differential projection mutual capacitance type oil-water interface monitoring system is provided, comprising: the system comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is arranged on the outer wall of the central tube based on an insulating material, the upper receiving electrode and the lower receiving electrode are arranged on the outer wall of the central tube and are connected with a conductive part of the outer wall of the central tube through wires, the alternating current signal transmitting device is arranged on the outer wall of the central tube and is respectively connected with the transmitting electrode and the conductive part of the outer wall of the central tube through wires, the digital current sensor is arranged on wires for connecting the upper receiving electrode and the lower receiving electrode with the central tube, the surface host is respectively connected with the alternating current signal transmitting device and the digital current sensor in a communication mode, and the central tube is inserted into a salt cavern gas storage through a middle tube of the salt cavern gas storage;
the surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value;
the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host;
the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the ground host.
On the basis of the technical scheme, the invention can also make the following improvements.
Preferably, the transmitting electrode, the upper receiving electrode and the lower receiving electrode are annular, and the transmitting electrode is located between the upper receiving electrode and the lower receiving electrode.
Preferably, the heights of the upper receiving electrode and the lower receiving electrode are the same, and the heights of the upper receiving electrode and the lower receiving electrode are 1/2 of the height of the transmitting electrode.
Preferably, the distance between the transmitting electrode and the top end of the central tube is H m The distance between the upper receiving electrode and the top end of the central tube is H m D, the distance between the upper receiving electrode and the top end of the central tube is H m +D, where H m And D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode.
Preferably, the digital current sensor comprises an alternating current sensor and a digital acquisition chip.
Preferably, the effective voltage value generated by the alternating current signal transmitting device is U, and the voltage frequency is f.
In a second aspect of the present invention, a differential type projected mutual capacitance type oil-water interface monitoring method is provided, and is applied to the differential type projected mutual capacitance type oil-water interface monitoring system, the system includes: the device comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a ground host; comprising the following steps:
when the central pipe descends to a salt cavern gas storage and the lower receiving electrode does not touch an oil-water interface, the surface host machine sends a test instruction to the alternating current signal transmitting device;
the alternating current signal transmitting device generates alternating voltage signals, and the digital current sensor acquires initial current effective values I passing through the upper receiving electrode and the lower receiving electrode 0 ；
When the preset working condition is met, the surface host machine sends a working instruction to the alternating current signal transmitting device;
the alternating current signal transmitting device generates the alternating voltage signal, and the digital current sensor acquires working current effective values which are I respectively through the upper receiving electrode and the lower receiving electrode u And I d ；
Based on the parameters of the alternating voltage signal, the initial current effective value I 0 The effective value I of the working current u And the effective value I of the working current d Calculating a test capacitance C formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode respectively 0 Working capacitor C u And C d ；
Based on the test capacitance C 0 The working capacitor C u The working capacitor C d The installation position of the transmitting electrode, the installation position of the upper receiving electrode and the installation position of the lower receiving electrode are used for calculating the depth of an oil-water interface in the salt cavern gas storageDegree.
Preferably, the test capacitor C 0 The method comprises the following steps:
C I ＝I 0 /2πfU；
the working capacitor C u The method comprises the following steps:
C u ＝I u /2πfU；
the working capacitor C d The method comprises the following steps:
C d ＝I d /2πfU；
wherein C is 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d For the working capacitance formed between the lower receiving electrode and the transmitting electrode, I 0 For the initial current of the upper receiving electrode and the lower receiving electrode, I u For the working current of the upper receiving electrode, I d For the working current of the lower receiving electrode, U is the effective value of the voltage generated by the alternating current signal transmitting device, and f is the frequency of the voltage generated by the alternating current signal transmitting device.
Preferably, the depth H of the oil-water interface is:
wherein H is m D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode, epsilon is the distance between the transmitting electrode and the top end of the central tube r For the relative permittivity epsilon of the liquid at the bottom of the reservoir 0 Is vacuum dielectric constant, S is effective area of upper receiving electrode and lower receiving electrode, C 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d Is the working capacitance formed between the lower receiving electrode and the transmitting electrode.
Preferably, the preset working conditions are as follows: the oil-water interface is positioned between the transmitting electrode and the lower receiving electrode, the oil-water interface is positioned between the transmitting electrode and the upper receiving electrode and/or the oil-water interface is positioned on the upper receiving electrode.
The invention provides a differential type projection mutual capacitance type oil-water interface monitoring system and a method, wherein the system comprises the following steps: the system comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is arranged on the outer wall of the central tube based on an insulating material, the upper receiving electrode and the lower receiving electrode are arranged on the outer wall of the central tube and are connected with a conductive part of the outer wall of the central tube through wires, the alternating current signal transmitting device is arranged on the outer wall of the central tube and is respectively connected with the transmitting electrode and the conductive part of the outer wall of the central tube through wires, the digital current sensor is arranged on wires for connecting the upper receiving electrode and the lower receiving electrode with the central tube, the surface host is respectively connected with the alternating current signal transmitting device and the digital current sensor in a communication mode, and the central tube is inserted into a salt cavern gas storage through a middle tube of the salt cavern gas storage; the surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value; the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host; the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the ground host. According to the invention, by adopting differential measurement, the influence of the bottom hole temperature and pressure environmental factors is reduced, meanwhile, the influence of the oil layer floating above the liquid on the monitoring result can be ignored by utilizing the property that the dielectric constant of the gas in the salt cavern gas storage is similar to that of the oil layer and the dielectric constant of the bottom liquid is larger, and meanwhile, the sensor is not directly contacted with the bottom liquid in the salt cavern gas storage, so that the corrosion of the bottom liquid to the sensor is greatly reduced, the sensor is durable, and the depth of an oil-water interface in the salt cavern gas storage is measured with low cost.
Drawings
FIG. 1 is a schematic diagram of a differential projection mutual capacitance type oil-water interface monitoring system according to the present invention;
FIG. 2 is a schematic diagram illustrating the installation of electrodes of the differential projection mutual capacitance type oil-water interface monitoring system provided by the invention;
FIG. 3 is a flow chart of a differential projection mutual capacitance type oil-water interface monitoring method provided by the invention;
fig. 4 is a schematic hardware structure of one possible electronic device according to the present invention;
FIG. 5 is a schematic diagram of a possible hardware configuration of a computer readable storage medium according to the present invention;
the reference numerals in the drawings are: 1-a central tube; 2-an emitter electrode; 3-upper receiving electrode; 4-a lower receiving electrode; 5-an alternating current signal transmitting device; 6-insulating material; 7-an intermediate tube; 8-permanent packer; 9-storing the gas; 10-oil-water interface; 11-liquid at the bottom of the gas reservoir.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Fig. 1 is a schematic structural diagram of a differential projection mutual capacitance type oil-water interface monitoring system provided by the invention, as shown in fig. 1, the system comprises: the device comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is installed on the outer wall of the central tube based on insulating materials, the upper receiving electrode and the lower receiving electrode are installed on the outer wall of the central tube and are connected with conductive parts of the outer wall of the central tube through wires, the alternating current signal transmitting device is installed on the outer wall of the central tube and is connected with the transmitting electrode and the conductive parts of the outer wall of the central tube through wires respectively, the digital current sensor is installed on the wires connected with the upper receiving electrode and the lower receiving electrode and the central tube, the surface host is connected with the alternating current signal transmitting device and the digital current sensor in a communication mode respectively, and the central tube is inserted into a salt cavern gas storage through the central tube of the salt cavern gas storage.
The surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value; the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host; the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the ground host.
It can be understood that the surface host is located above the bottom surface and is used for transmitting test instructions and working instructions to the alternating current signal transmitting device in the salt cavern gas storage, receiving the current effective value measured by the digital current sensor, and determining the depth of the oil-water interface according to the received current effective value and combining with the system structural parameters.
It will be appreciated that the above-described central tube is used to insert a salt cavern gas reservoir through its intermediate tube for the addition or removal of liquid from the bottom of the reservoir into the reservoir.
Further, the transmitting electrode, the upper receiving electrode and the lower receiving electrode are annular, and the transmitting electrode is located between the upper receiving electrode and the lower receiving electrode.
Further, the distance between the transmitting electrode and the top end of the central tube is H m The distance between the upper receiving electrode and the top end of the central tube is H m D, the distance between the upper receiving electrode and the top end of the central tube is H m +D, where H m And D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode.
It is understood that the distance between the transmitting electrode and the upper and lower receiving electrodes is the same, and the distance D may be set to a value ranging from 10 to 30 m. The mounting positions of the transmitting electrode, the upper receiving electrode, and the lower receiving electrode described above are shown in fig. 2.
Further, the heights of the upper receiving electrode and the lower receiving electrode are the same, and the heights of the upper receiving electrode and the lower receiving electrode are 1/2 of the height of the transmitting electrode.
Further, the digital current sensor comprises an alternating current sensor and a digital acquisition chip.
It can be understood that the digital current sensor is connected with the upper receiving electrode and the lower receiving electrode on the lead of the central tube for measuring the initial current I passing through the upper receiving electrode and the lower receiving electrode 0 Operating current I u And an operating current I d 。
Further, the effective value of the voltage generated by the alternating current signal transmitting device is U, and the frequency of the voltage is f.
It can be appreciated that based on the defects in the background technology, the embodiment of the invention provides a differential type projection mutual capacitance type oil-water interface monitoring system. The system comprises: the system comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is arranged on the outer wall of the central tube based on an insulating material, the upper receiving electrode and the lower receiving electrode are arranged on the outer wall of the central tube and are connected with a conductive part of the outer wall of the central tube through wires, the alternating current signal transmitting device is arranged on the outer wall of the central tube and is respectively connected with the transmitting electrode and the conductive part of the outer wall of the central tube through wires, the digital current sensor is arranged on wires for connecting the upper receiving electrode and the lower receiving electrode with the central tube, the surface host is respectively connected with the alternating current signal transmitting device and the digital current sensor in a communication mode, and the central tube is inserted into a salt cavern gas storage through a middle tube of the salt cavern gas storage; the surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value; the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host; the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the ground host. According to the invention, by adopting differential measurement, the influence of the bottom hole temperature and pressure environmental factors is reduced, meanwhile, the influence of the oil layer floating above the liquid on the monitoring result can be ignored by utilizing the property that the dielectric constant of the gas in the salt cavern gas storage is similar to that of the oil layer and the dielectric constant of the bottom liquid is larger, and meanwhile, the sensor is not directly contacted with the bottom liquid in the salt cavern gas storage, so that the corrosion of the bottom liquid to the sensor is greatly reduced, the sensor is durable, and the depth of an oil-water interface in the salt cavern gas storage is measured with low cost.
Referring to fig. 3, fig. 3 is a flowchart of a differential projection mutual capacitance type oil-water interface monitoring method according to an embodiment of the present invention, as shown in fig. 3, a differential projection mutual capacitance type oil-water interface monitoring method is applied to the differential projection mutual capacitance type oil-water interface monitoring system, and the system includes: the device comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a ground host; the differential type projection mutual capacitance type oil-water interface monitoring method comprises the following steps:
step S100: when the central pipe descends to a salt cavern gas storage and the lower receiving electrode does not touch an oil-water interface, the surface host machine sends a test instruction to the alternating current signal transmitting device;
step S200: the alternating current signal transmitting device generates alternating voltage signals, and the digital current sensor acquires initial current effective values I passing through the upper receiving electrode and the lower receiving electrode 0 ；
Step S300: when the preset working condition is met, the surface host machine sends a working instruction to the alternating current signal transmitting device;
it is understood that the predetermined operating condition may be that the oil-water interface is located between the transmitting electrode and the lower receiving electrode, the oil-water interface is located between the transmitting electrode and the upper receiving electrode, and/or the oil-water interface is located on the upper receiving electrode.
Step S400: the alternating current signal transmitting device generates the alternating voltage signal, and the digital current sensor acquires working current effective values which are I respectively through the upper receiving electrode and the lower receiving electrode u And I d ；
Step S500: based on the parameters of the alternating voltage signal, the initial current effective value I 0 The effective value I of the working current u And the effective value I of the working current d Calculating a test capacitance C formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode respectively 0 Working capacitor C u And C d ；
Further, the test capacitor C 0 The method comprises the following steps:
C 0 ＝I 0 /2πfU；
the working capacitor C u The method comprises the following steps:
C u ＝I u /2πfU；
the working capacitor C d The method comprises the following steps:
C d ＝I d /2πfU；
wherein C is 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d For the working capacitance formed between the lower receiving electrode and the transmitting electrode, I 0 For the initial current of the upper receiving electrode and the lower receiving electrode, I u For the working current of the upper receiving electrode, I d For the working current of the lower receiving electrode, U is the effective value of the voltage generated by the alternating current signal transmitting device, and f is the frequency of the voltage generated by the alternating current signal transmitting device.
Step S600: based on the test capacitance C 0 The working capacitor C u The working capacitor C d And calculating the depth of an oil-water interface in the salt cavern gas storage according to the installation position of the transmitting electrode, the installation position of the upper receiving electrode and the installation position of the lower receiving electrode.
Further, the depth H of the oil-water interface is:
wherein H is m D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode, epsilon is the distance between the transmitting electrode and the top end of the central tube r For the relative permittivity epsilon of the liquid at the bottom of the reservoir 0 Is vacuum dielectric constant, S is effective area of upper receiving electrode and lower receiving electrode, C 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d Is the working capacitance formed between the lower receiving electrode and the transmitting electrode.
It can be understood that the differential projection mutual capacitance type oil-water interface monitoring method provided by the present invention corresponds to the differential projection mutual capacitance type oil-water interface monitoring system provided by the foregoing embodiments, and the relevant technical features of the differential projection mutual capacitance type oil-water interface monitoring method may refer to the relevant technical features of the differential projection mutual capacitance type oil-water interface monitoring system, which are not described herein again.
In one possible application scenario, when the salt cavern gas storage is lowered and the oil-water interface is not in contact with the lower receiving electrode, the medium between the upper receiving electrode, the lower receiving electrode and the transmitting electrode is gas stored in the gas storage, and the dielectric constant of the gas storage is equal to the vacuum dielectric constant. Wherein I is u To receive electrode lead current, I d For receiving electrode wire current, I 0 To receive the initial current of the electrode wire current up and down, H m For the depth of the emitter electrode from the top of the gas reservoir, D is the spacing between the electrodes, D 1 Is the height of the gas medium, d 2 Epsilon is the height of the liquid medium r For the relative permittivity epsilon of the liquid at the bottom of the reservoir 0 The vacuum dielectric constant is the effective value of the voltage generated by the alternating current signal transmitting device, f is the frequency of the voltage generated by the alternating current signal transmitting device, and S is the relative effective area of the upper receiving electrode and the lower receiving electrode.
The capacitance formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode can be expressed as follows:
the capacitance current calculation formula is:
I＝2πfCU(2)；
according to equation (2), the initial capacitance is:
in one possible application scenario, when the oil-water interface does not contact the lower receiving electrode, the medium between the upper receiving electrode, the lower receiving electrode and the transmitting electrode is gas stored in the gas storage, and the dielectric constant of the gas storage is basically equal to the vacuum dielectric constant.
The capacitance formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode can be expressed as follows:
from formulas (1), (4), it is possible to obtain:
C d ≈C u ≈C 0 (5)；
in this case the oil-water interface depth is considered to be:
H＝H m +D(6)。
in one possible application scenario, when the oil-water interface is located between the transmitting electrode and the lower receiving electrode, the medium between the upper receiving electrode and the transmitting electrode is a gas storage reservoir for storing gas, and the medium between the lower receiving electrode and the transmitting electrode is a double-layer medium for storing gas and bottom liquid.
According to formula (2), the capacitance formed by the upper receiving electrode and the transmitting electrode:
according to formula (2), the capacitance formed by the lower receiving electrode and the transmitting electrode:
due to C d >>C u By combining the formulas (7) and (8), the expression formula of the oil-water interface height can be obtained:
in one possible application scenario, when the oil-water interface is located between the transmitting electrode and the upper receiving electrode, the medium between the upper receiving electrode and the transmitting electrode is a double-layer medium storing gas and bottom liquid, and the medium between the lower receiving electrode and the transmitting electrode is bottom liquid.
According to formula (2), the capacitance formed by the upper receiving electrode and the transmitting electrode:
according to formula (2), the capacitance formed by the lower receiving electrode and the transmitting electrode:
at this point C is still present d >C u By combining the formulas (10) and (11), the oil-water interface height can be obtainedThe expression formula of the degree is:
in one possible application scenario, when the oil-water interface is located above the upper receiving electrode, the medium between the upper receiving electrode, the lower receiving electrode and the transmitting electrode is the liquid at the bottom of the gas reservoir.
The capacitance formed by the upper receiving electrode, the lower receiving electrode and the transmitting electrode can be expressed as:
according to the formulas (1) and (13), can be obtained
C d ≈C u >>C 0 (14)；
In this case, it is considered that the oil-water interface height h=h m -D(15)。
The depth of the oil-water interface above the upper receiving electrode cannot be continuously monitored, so that the liquid at the bottom of the gas storage is considered to be about to contact with the upper part of the cavity under the condition, and the gas storage stops outputting gas outwards.
According to the differential type projection mutual capacitance type oil-water interface monitoring method in the embodiment, the differential type mutual capacitance type sensor adopts differential type measurement, and the downhole temperature, pressure and other environmental factors can influence the downhole medium at the same time, so that the influence of the environmental factors can be avoided to a great extent; the method utilizes the property that the dielectric constants of the oil layer of the liquid level and the stored gas are similar and have larger difference with the dielectric constant of the liquid at the bottom, so that the influence of the floating oil layer above the liquid on the monitoring result can be avoided; the sensor is not in direct contact with the liquid at the bottom of the gas storage, is largely free from the influence of liquid corrosion, and can have longer working time. Meanwhile, the differential projection mutual capacitance type oil-water interface monitoring method and system can be applied to oil wells and other underground gas reservoirs.
Referring to fig. 4, fig. 4 is a schematic diagram of an embodiment of an electronic device according to an embodiment of the invention. As shown in fig. 4, an embodiment of the present invention provides an electronic device including a memory 1310, a processor 1320, and a computer program 1311 stored on the memory 1310 and executable on the processor 1320, the processor 1320 implementing the following steps when executing the computer program 1311:
when the central pipe descends to a salt cavern gas storage and the lower receiving electrode does not touch an oil-water interface, the surface host machine sends a test instruction to the alternating current signal transmitting device; the alternating current signal transmitting device generates alternating voltage signals, and the digital current sensor acquires initial current effective values I0 passing through the upper receiving electrode and the lower receiving electrode; when the preset working condition is met, the surface host machine sends a working instruction to the alternating current signal transmitting device; the alternating current signal transmitting device generates the alternating voltage signal, and the digital current sensor acquires working current effective values Iu and Id passing through the upper receiving electrode and the lower receiving electrode respectively; calculating a test capacitance C0 and working capacitances Cu and Cd respectively formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode based on the parameters of the alternating voltage signal, the initial current effective value I0, the working current effective value Iu and the working current effective value Id; and calculating the depth of an oil-water interface in the salt cavern gas storage based on the test capacitor C0, the working capacitor Cu, the working capacitor Cd, the installation position of the transmitting electrode, the installation position of the upper receiving electrode and the installation position of the lower receiving electrode.
Referring to fig. 5, fig. 5 is a schematic diagram of an embodiment of a computer readable storage medium according to the present invention. As shown in fig. 5, the present embodiment provides a computer-readable storage medium 1400 having stored thereon a computer program 1411, which computer program 1411, when executed by a processor, performs the steps of:
when the central pipe descends to a salt cavern gas storage and the lower receiving electrode does not touch an oil-water interface, the surface host machine sends a test instruction to the alternating current signal transmitting device; the alternating current signal transmitting device generates alternating voltage signals, and the digital current sensor acquires initial current effective values I0 passing through the upper receiving electrode and the lower receiving electrode; when the preset working condition is met, the surface host machine sends a working instruction to the alternating current signal transmitting device; the alternating current signal transmitting device generates the alternating voltage signal, and the digital current sensor acquires working current effective values Iu and Id passing through the upper receiving electrode and the lower receiving electrode respectively; calculating a test capacitance C0 and working capacitances Cu and Cd respectively formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode based on the parameters of the alternating voltage signal, the initial current effective value I0, the working current effective value Iu and the working current effective value Id; and calculating the depth of an oil-water interface in the salt cavern gas storage based on the test capacitor C0, the working capacitor Cu, the working capacitor Cd, the installation position of the transmitting electrode, the installation position of the upper receiving electrode and the installation position of the lower receiving electrode.
The embodiment of the invention provides a differential type projection mutual capacitance type oil-water interface monitoring system and a method, wherein the system comprises the following steps: the system comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is arranged on the outer wall of the central tube based on an insulating material, the upper receiving electrode and the lower receiving electrode are arranged on the outer wall of the central tube and are connected with a conductive part of the outer wall of the central tube through wires, the alternating current signal transmitting device is arranged on the outer wall of the central tube and is respectively connected with the transmitting electrode and the conductive part of the outer wall of the central tube through wires, the digital current sensor is arranged on wires for connecting the upper receiving electrode and the lower receiving electrode with the central tube, the surface host is respectively connected with the alternating current signal transmitting device and the digital current sensor in a communication mode, and the central tube is inserted into a salt cavern gas storage through a middle tube of the salt cavern gas storage; the surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value; the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host; the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the ground host. According to the invention, by adopting differential measurement, the influence of the bottom hole temperature and pressure environmental factors is reduced, meanwhile, the influence of the oil layer floating above the liquid on the monitoring result can be ignored by utilizing the property that the dielectric constant of the gas in the salt cavern gas storage is similar to that of the oil layer and the dielectric constant of the bottom liquid is larger, and meanwhile, the sensor is not directly contacted with the bottom liquid in the salt cavern gas storage, so that the corrosion of the bottom liquid to the sensor is greatly reduced, the sensor is durable, and the depth of an oil-water interface in the salt cavern gas storage is measured with low cost.
In the foregoing embodiments, the descriptions of the embodiments are focused on, and for those portions of one embodiment that are not described in detail, reference may be made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present 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, and the like) 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 flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows 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 apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A differential type projected mutual capacitance type oil-water interface monitoring system, characterized in that the system comprises: the system comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a surface host, wherein the transmitting electrode is arranged on the outer wall of the central tube based on an insulating material, the upper receiving electrode and the lower receiving electrode are arranged on the outer wall of the central tube and are connected with a conductive part of the outer wall of the central tube through wires, the distances from the upper receiving electrode and the lower receiving electrode to the transmitting electrode are the same, the transmitting electrode is positioned between the upper receiving electrode and the lower receiving electrode, the alternating current signal transmitting device is arranged on the outer wall of the central tube and is connected with the conductive part of the transmitting electrode and the outer wall of the central tube through wires, the digital current sensor is arranged on the wires connected with the upper receiving electrode and the lower receiving electrode and the central tube, the surface host is connected with the alternating current signal transmitting device and the digital current sensor through wires in a communication way, and the central tube is inserted into a salt hole gas storage through a middle tube of the salt hole gas storage;
the surface host is used for receiving a control instruction input by a user, issuing a test instruction and/or a working instruction to the alternating current signal transmitting device based on the control instruction, receiving a current effective value returned by the digital current sensor, and calculating the depth of an oil-water interface according to the current effective value;
the alternating current signal transmitting device is used for generating an alternating current voltage signal based on a test instruction and/or a working instruction sent by the surface host;
the digital current sensor is used for measuring the current passing through the upper receiving electrode and the lower receiving electrode and sending the measurement result to the surface host.
2. The differential projection mutual capacitance type oil-water interface monitoring system as claimed in claim 1, wherein the transmitting electrode, the upper receiving electrode and the lower receiving electrode are annular.
3. The differential projection mutual capacitance type oil-water interface monitoring system as claimed in claim 1, wherein the distance between the transmitting electrode and the top end of the central tube is H m The upper receiving electrode is spaced from the central tube topThe distance between the ends is H m D, the distance between the lower receiving electrode and the top end of the central tube is H m +D, where H m And D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode.
4. The differential projection mutual capacitance type oil-water interface monitoring system according to claim 1, wherein the digital current sensor comprises an alternating current sensor and a digital acquisition chip.
5. The differential type projection mutual capacitance type oil-water interface monitoring system as claimed in claim 1, wherein the effective value of the voltage generated by the alternating current signal transmitting device is U, and the frequency of the voltage is f.
6. The differential type projection mutual capacitance type oil-water interface monitoring method is characterized by being applied to the differential type projection mutual capacitance type oil-water interface monitoring system, and the system comprises the following steps: the device comprises a central tube, a transmitting electrode, an upper receiving electrode, a lower receiving electrode, an alternating current signal transmitting device, a digital current sensor and a ground host, wherein the distances from the upper receiving electrode and the lower receiving electrode to the transmitting electrode are the same, and the transmitting electrode is positioned between the upper receiving electrode and the lower receiving electrode;
the differential type projection mutual capacitance type oil-water interface monitoring method comprises the following steps:
when the central pipe descends to a salt cavern gas storage and the lower receiving electrode does not touch an oil-water interface, the surface host machine sends a test instruction to the alternating current signal transmitting device;
the alternating current signal transmitting device generates alternating voltage signals, and the digital current sensor acquires initial current effective values I passing through the upper receiving electrode and the lower receiving electrode 0 ；
When the preset working condition is met, the surface host machine sends a working instruction to the alternating current signal transmitting device;
the alternating current signal transmitting device generates the alternating current signalThe effective value of working current which is acquired by the digital current sensor and passes through the upper receiving electrode and the lower receiving electrode is I u And I d ；
Based on the parameters of the alternating voltage signal, the initial current effective value I 0 The effective value I of the working current u And the effective value I of the working current d Calculating a test capacitance C formed by the upper receiving electrode and the lower receiving electrode and the transmitting electrode respectively 0 Working capacitor C u And C d ；
Based on the test capacitance C 0 The working capacitor C u The working capacitor C d And calculating the depth of an oil-water interface in the salt cavern gas storage according to the installation position of the transmitting electrode, the installation position of the upper receiving electrode and the installation position of the lower receiving electrode.
7. The method for monitoring a differential projection mutual capacitance type oil-water interface as claimed in claim 6, wherein the test capacitor C 0 The method comprises the following steps:
C 0 ＝I 0 /2πfU；
the working capacitor C u The method comprises the following steps:
C u ＝I u /-2πfU；
the working capacitor C d The method comprises the following steps:
C d ＝I d /2πfU；
wherein C is 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d For the working capacitance formed between the lower receiving electrode and the transmitting electrode, I 0 For the initial current of the upper receiving electrode and the lower receiving electrode, I u For the working current of the upper receiving electrode, I d For the working current of the lower receiving electrode, U is the effective value of the voltage generated by the alternating current signal transmitting device, and f is the frequency of the voltage generated by the alternating current signal transmitting device.
8. The differential projection mutual capacitance type oil-water interface monitoring method according to claim 6, wherein the depth H of the oil-water interface is:
wherein H is m D is the distance between the upper receiving electrode and the lower receiving electrode and the transmitting electrode, epsilon is the distance between the transmitting electrode and the top end of the central tube r For the relative permittivity epsilon of the liquid at the bottom of the reservoir 0 Is vacuum dielectric constant, S is effective area of upper receiving electrode and lower receiving electrode, C 0 C is the test capacitance formed between the upper receiving electrode, the lower receiving electrode and the transmitting electrode u C is the working capacitance formed between the upper receiving electrode and the transmitting electrode d Is the working capacitance formed between the lower receiving electrode and the transmitting electrode.
9. The method for monitoring a differential projection mutual capacitance type oil-water interface according to claim 6, wherein the preset working conditions are as follows: the oil-water interface is positioned between the transmitting electrode and the lower receiving electrode, the oil-water interface is positioned between the transmitting electrode and the upper receiving electrode and/or the oil-water interface is positioned on the upper receiving electrode.
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