CN112577559B - Double-channel multiphase fluid nuclear magnetic resonance online detection device and method - Google Patents
Double-channel multiphase fluid nuclear magnetic resonance online detection device and method Download PDFInfo
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Abstract
The embodiment of the invention provides a double-channel multiphase fluid nuclear magnetic resonance online detection device and a method, wherein the device comprises: the two ends of the nuclear magnetic pipeline are single branch pipelines, and the middle part of the nuclear magnetic pipeline comprises two sections of completely identical branch pipelines; two ends of the first branch pipeline are respectively provided with a controllable switch; the two branch pipelines are positioned in the magnetic coverage area of the antenna equipment; the magnetic coverage area of the antenna device is placed within the uniform magnetic field region of the dipole magnet; the control equipment controls the two controllable switches to be switched on and off; when the two controllable switches are turned off simultaneously, the spectrometer equipment drives the first coil to emit a gradient magnetic field and drives the second antenna to emit a nuclear magnetic resonance pulse sequence, a first echo string data set corresponding to the first branch pipeline is obtained, a second echo string data set corresponding to the second branch pipeline is obtained, the content of each component in the multiphase fluid and the flow rate of the multiphase fluid are detected respectively according to the first echo string data set and the second echo string data set, and the flow of each component in the multiphase fluid is determined.
Description
Technical Field
The invention relates to the technical field of oil drilling and production, in particular to a double-channel multiphase fluid nuclear magnetic resonance online detection device and method.
Background
In the field of petroleum drilling and production engineering, the online quantitative detection of multiphase flow of oil-gas wells and pipelines is very challenging, and no reliable technology is available for accurately measuring the flow of each component of the multiphase flow on the premise of not separating oil, gas and water. Hitherto, the multiphase flow metering technology commonly adopted at home and abroad is to convey the produced fluid to a gathering and transportation station through a pipeline, firstly carry out three-phase separation, and then measure the content of each component respectively. The indirect measurement method has the problems of low efficiency, high cost, data delay and the like, and can not reflect the real transient liquid production characteristics of a wellhead. In recent years, direct measurement techniques for multiphase flow have received much attention and have been developed. The multiphase flowmeter enables the fluid produced by the wellhead to be subjected to flow measurement on line before stabilization, separation, full-process treatment and other processes, minimizes the influence of human factors, truly reflects the transient performance of the wellhead, and has important significance for oil reservoir fine management, production distribution optimization, wellhead test and the like.
The nuclear magnetic resonance technology is a mainstream indoor fluid detection technology, and can quantitatively analyze the component content of the multiphase fluid in a static state. However, when this technique is applied to flowing fluids, it is not possible to directly measure using conventional measurement methods because the fluid has flowed out of the detection zone when a single measurement is not completed.
The prior art also provides a method for determining the component flow of the multiphase fluid, and the method adopts a method of statically measuring the component content and flowing and measuring the flow rate to realize the measurement of the component flow of the multiphase fluid; the method includes the steps that firstly, a section of fluid is intercepted for static measurement, when in static measurement, multiphase flow passes through a bypass outside a nuclear magnetic resonance probe, then the bypass valve is closed, two sections of valves of a flow passage in the probe are opened, the multiphase flow passes through the probe, and flow rate measurement in a flowing state is carried out. When the method is adopted, the fluid properties and the component content in one period of static measurement and flow measurement are obviously changed, so that the final flow measurement result is inaccurate.
Disclosure of Invention
The embodiment of the invention provides a double-channel multiphase fluid nuclear magnetic resonance online detection device, which aims to solve the technical problem of inaccurate flow measurement result in the prior art. The device includes:
the device comprises a nuclear magnetic pipeline, wherein single branch pipelines are arranged at two ends of the nuclear magnetic pipeline, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline and a second branch pipeline;
the two controllable switches are respectively arranged at two ends of the first branch pipeline;
the antenna equipment comprises a first coil and a second antenna, wherein the first coil is used for transmitting a gradient magnetic field, and the second antenna is used for transmitting a nuclear magnetic resonance pulse sequence to respectively carry out layered scanning on the two branch pipelines and receive echo train data;
a dipole magnet, a magnetic footprint of the antenna apparatus being disposed within a uniform magnetic field region produced by the dipole magnet;
the control equipment is used for simultaneously controlling the closing and the opening of the two controllable switches;
and spectrometer equipment, configured to drive the first coil to emit a gradient magnetic field and drive the second antenna to emit a nuclear magnetic resonance pulse sequence when the two controllable switches are simultaneously turned off, obtain a first echo train data set corresponding to the first branch pipeline, obtain a second echo train data set corresponding to the second branch pipeline, detect the content of each component in the multiphase fluid according to the first echo train data set, detect the flow rate of the multiphase fluid according to the second echo train data set, and determine the flow rate of each component in the multiphase fluid according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
The embodiment of the invention also provides a double-channel multiphase fluid nuclear magnetic resonance online detection method, which aims to solve the technical problem of inaccurate flow measurement result in the prior art. The device includes:
the method comprises the following steps that single branch pipelines are arranged at two ends of a nuclear magnetic pipeline, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline and a second branch pipeline;
two ends of the first branch pipeline are respectively provided with a controllable switch;
placing two branch pipelines in a magnetic coverage area, wherein the magnetic coverage area comprises a gradient magnetic field and a nuclear magnetic resonance pulse sequence;
providing a dipole magnet, said magnetic footprint being disposed within a uniform magnetic field region generated by said magnet;
when the two controllable switches are turned off simultaneously, a first echo string data set corresponding to the first branch pipeline is obtained, a second echo string data set corresponding to the second branch pipeline is obtained, the content of each component in the multiphase fluid is detected according to the first echo string data set, the flow rate of the multiphase fluid is detected according to the second echo string data set, and the flow rate of each component in the multiphase fluid is determined according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
In the embodiment of the invention, two ends of the nuclear magnetic pipeline are single branch pipelines, and the middle part of the nuclear magnetic pipeline comprises two identical branch pipelines, so that the multiphase fluid can flow in through one end of the nuclear magnetic pipeline and flow out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, namely when the multiphase fluid simultaneously flows through the two branch pipelines, the fluid properties and the component contents of the multiphase fluid in the two branch pipelines are consistent; two branch pipelines are simultaneously arranged in a magnetic coverage area of the antenna equipment and a uniform magnetic field area generated by a dipole magnet, namely, a multiphase fluid flowing through the two branch pipelines can be magnetized by the magnetic coverage area of the antenna equipment and can also be magnetized by a uniform magnetic field generated by the dipole magnet, and can also be scanned by a nuclear magnetic resonance pulse sequence, controllable switches are respectively arranged at two ends of a first branch pipeline, when the two controllable switches are simultaneously closed, the multiphase fluid in the first branch pipeline is static, and the multiphase fluid flows through a second branch pipeline completely, at the moment, the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short, the multiphase fluid can be approximately seen as the consistency of fluid properties and component content, so as to obtain a first echo train data set corresponding to the first branch pipeline, obtain a second echo train data set corresponding to the second branch pipeline, and detect the content of each component in the multiphase fluid according to the first echo train data set, and detecting the flow rate of the multi-phase fluid according to the second echo string data set, and determining the flow rate of each component in the multi-phase fluid according to the content of each component in the multi-phase fluid and the flow rate of the multi-phase fluid. Because the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short when the first echo string data set and the second echo string data set are acquired, the multiphase fluid can be approximately seen as consistent in fluid property and component content, and then the static measurement and the flow measurement can be approximately simultaneously realized, so that the accuracy of the flow measurement result can be improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
fig. 1 is a schematic structural diagram of a dual-channel multiphase fluid nuclear magnetic resonance online detection device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a hierarchical scan according to an embodiment of the present invention;
FIG. 3 is a flow chart of a working method of a dual-channel multiphase fluid nuclear magnetic resonance online detection device according to an embodiment of the present invention;
fig. 4 is a flowchart of a dual-channel multiphase fluid nuclear magnetic resonance online detection method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In an embodiment of the present invention, a dual-channel multiphase fluid nmr online detection device is provided, as shown in fig. 1, the device includes:
the nuclear magnetic pipeline 1 is characterized in that two ends of the nuclear magnetic pipeline are single branch pipelines, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline 101 and a second branch pipeline 102;
the two controllable switches 2 are respectively arranged at two ends of the first branch pipeline;
the antenna equipment comprises a first coil and a second antenna, wherein the first coil is used for transmitting a gradient magnetic field, and the second antenna is used for transmitting a nuclear magnetic resonance pulse sequence to respectively carry out layered scanning on the two branch pipelines and receive echo train data;
a dipole magnet 4, the magnetic footprint of the antenna device being placed within a uniform magnetic field region produced by the dipole magnet;
a control device (not shown) for simultaneously controlling the closing and opening of both said controllable switches;
and spectrometer equipment (not shown) for driving the first coil to emit a gradient magnetic field and driving the second antenna to emit a nuclear magnetic resonance pulse sequence when the two controllable switches are simultaneously turned off, acquiring a first echo train data set corresponding to the first branch pipeline, acquiring a second echo train data set corresponding to the second branch pipeline, detecting the content of each component in the multiphase fluid according to the first echo train data set, detecting the flow rate of the multiphase fluid according to the second echo train data set, and determining the flow rate of each component in the multiphase fluid according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
As shown in fig. 1, in the embodiment of the present invention, two ends of the nuclear magnetic pipeline are single branch pipelines, and the middle of the nuclear magnetic pipeline includes two identical branch pipelines, so that the multiphase fluid can flow in through one end of the nuclear magnetic pipeline and flow out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, that is, when the multiphase fluid flows through the two branch pipelines at the same time, the fluid properties and the component contents of the multiphase fluid in the two branch pipelines are consistent; two branch pipelines are simultaneously arranged in a magnetic coverage area of the antenna equipment and a uniform magnetic field area generated by a dipole magnet, namely, a multiphase fluid flowing through the two branch pipelines can be magnetized by the magnetic coverage area of the antenna equipment and can also be magnetized by a uniform magnetic field generated by the dipole magnet, and can also be scanned by a nuclear magnetic resonance pulse sequence, controllable switches are respectively arranged at two ends of a first branch pipeline, when the two controllable switches are simultaneously closed, the multiphase fluid in the first branch pipeline is static, and the multiphase fluid flows through a second branch pipeline completely, at the moment, the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short, the multiphase fluid can be approximately seen as the consistency of fluid properties and component content, so as to obtain a first echo train data set corresponding to the first branch pipeline, obtain a second echo train data set corresponding to the second branch pipeline, and detect the content of each component in the multiphase fluid according to the first echo train data set, and detecting the flow rate of the multi-phase fluid according to the second echo string data set, and determining the flow rate of each component in the multi-phase fluid according to the content of each component in the multi-phase fluid and the flow rate of the multi-phase fluid. Because the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short when the first echo string data set and the second echo string data set are acquired, the multiphase fluid can be approximately seen as consistent in fluid property and component content, and then the static measurement and the flow measurement can be approximately simultaneously realized, so that the accuracy of the flow measurement result can be improved.
In practical applications, the multiphase fluid includes but is not limited to oil and gas multiphase fluid, for example, multiphase fluid including oil and water may also be used.
During specific implementation, two ends of the nuclear magnetic pipeline can be butted with a pipeline to be tested in an oil and gas field or other application scenes through structures such as a flange plate, and the like, as shown in fig. 1, the middle part of the nuclear magnetic pipeline is divided into two sections of branch pipelines with the same size and structure by a main pipeline.
In specific implementation, in order to further improve the accuracy of the measurement result, in this embodiment, the two branch pipelines are completely horizontally disposed, and the two branch pipelines are at the same horizontal height. That is, one of the branch lines cannot be higher or lower than the other branch line, because the multiphase fluid tends to concentrate more easily in the upper part of the pipe due to the density difference, and the high density fluid is opposite, and if the two pipes have the difference, the multiphase fluid in the two pipes tends to have different component contents, thereby affecting the accuracy of the measurement result.
In specific implementation, as shown in fig. 1, two ends of a first branch pipeline in two branch pipelines are respectively provided with a controllable switch, and a control device controls the two controllable switches to be turned on and off according to a preset sampling frequency, wherein the first branch pipeline is used for measuring the component content of the multiphase fluid, and the second branch pipeline is used for measuring the flow rate of the multiphase fluid.
In practical implementation, in order to further improve the accuracy of the measurement result, in this embodiment, as shown in fig. 1, the direction of the magnetic field generated by the bipolar magnet 4 is radially parallel to the nuclear magnetic pipeline and perpendicular to the horizontal plane.
In specific implementation, the direction of the gradient magnetic field is parallel to the radial direction of the nuclear magnetic pipeline and perpendicular to the horizontal plane, and the gradient magnetic field is used for calibrating the position of each layer when the multiphase fluid flows in the nuclear magnetic pipeline in a layered mode.
Specifically, after the gradient magnetic field magnetizes the multiphase fluid, and then the nuclear magnetic resonance pulse sequence is applied to the multiphase fluid after the magnetization processing, the resonance frequency of echo train data generated by the multiphase fluid at any position in the pipeline is associated with the height of the pipeline in the radial direction, so that the position of each position of the multiphase fluid in the pipeline during the layered flow can be calibrated according to the resonance frequency of the received echo train data.
In a specific implementation, the first coil included in the antenna apparatus may be a gradient coil for generating a radio frequency field gradient (i.e., a gradient magnetic field) required for a slice scan, and the second antenna included in the antenna apparatus may be a solenoid antenna for transmitting a CPMG (nuclear magnetic resonance) pulse sequence and acquiring echo train signals.
When the dual-core magnetic pipeline is specifically implemented, the antenna equipment can be arranged on the antenna pipe, and the dual-core magnetic pipeline is arranged in the antenna pipe.
In practice, in order to leave a pre-magnetization region for the multiphase fluid at the front end, in this embodiment, the antenna device may be disposed at a rear portion within the uniform magnetic field region generated by the dipole magnet, that is, the magnetic coverage area of the antenna device is disposed at a rear portion within the uniform magnetic field region generated by the dipole magnet, wherein the multiphase fluid flows in the nuclear magnetic pipeline from front to back.
In specific implementation, as shown in fig. 2, when the second antenna transmits the nuclear magnetic resonance pulse sequence to perform layered scanning on two branch pipelines respectively, the two branch pipelines may be sequentially scanned in a horizontal direction in a layered manner, and the thickness of each scanning layer may be equal to one n (n is an integer greater than 0) of the inner diameter of a single branch pipeline.
In specific implementation, after the first echo train data set and the second echo train data set are obtained, the content of each component in the multiphase fluid and the flow rate of the multiphase fluid can be calculated, for example, the content of each component in the multiphase fluid is calculated through the following steps: the first echo train data set comprises echo train signals corresponding to each scanning layer in the first branch pipeline, the echo train signals corresponding to each scanning layer can be inverted to obtain a corresponding T2 (transverse relaxation time) spectrum, the T2 spectrum shows the content of each component in the multiphase fluid in the scanning layer, the T2 spectrum corresponding to each scanning layer is accumulated to obtain a T2 spectrum corresponding to the first branch pipeline, and the content of each component in the multiphase fluid is calculated through the following formula:
wherein, WiRepresents the percentage of the ith component; siRepresenting the corresponding spectral peak area of the ith component in a transverse relaxation time spectrum, wherein the transverse relaxation time spectrum is obtained by inverting the first echo train data (namely a T2 spectrum corresponding to a first branch pipeline); HI (high-intensity)iRepresenting the hydrogen index of the ith component; k represents the number of components in the multiphase fluid.
Specifically, the second echo train data set includes echo train signals corresponding to each scanning layer in the second branch pipeline, the echo train signals corresponding to each scanning layer are accumulated to obtain the second echo train data set, the average flow velocity of the multiphase fluid can be obtained based on the second echo train data set according to the fact that the attenuation speed of the echo train signals is in direct proportion to the flow velocity, and then the content of each component in the multiphase fluid is multiplied by the cross-sectional area of the second branch pipeline and then multiplied by the average flow velocity of the multiphase fluid, so that the flow of each component in the multiphase fluid can be obtained.
Specifically, the working method of the dual-channel multiphase flow nuclear magnetic resonance online detection device is described with reference to fig. 3, the measurement method includes two parts of component content measurement and flow rate measurement, and data acquisition, data processing and interpretation of the two parts are completed simultaneously. The measurement process is as follows:
And 2, after the measurement is started, controlling two controllable valves on the first branch pipeline to be closed through the control equipment, and enabling the multiphase fluid to completely flow through the second branch pipeline.
And 3, driving the gradient antenna to emit a uniform radio frequency gradient field by the spectrometer equipment, driving the solenoid antenna to emit a CPMG pulse sequence, and sequentially carrying out layered scanning on the two branch pipelines along the horizontal direction.
wherein, WiRepresents the percentage of the ith component; siRepresenting the corresponding spectral peak area of the ith component in a transverse relaxation time spectrum, wherein the transverse relaxation time spectrum is obtained by inverting the first echo string data set; HI (high-intensity)iRepresenting the hydrogen index of the ith component; k represents the number of components in the multiphase fluid.
And 5, obtaining the average flow velocity of the multiphase fluid based on the second echo train data set according to the fact that the attenuation velocity of the echo train is in direct proportion to the flow velocity.
And 6, multiplying the average flow velocity by the cross-sectional area of a single branch pipeline, and then multiplying by the percentage of each component content to obtain the flow of each component.
And 7, after metering is finished, controlling the valve to be opened by the control equipment, and waiting for the next sampling period.
Based on the same inventive concept, the embodiment of the invention also provides a dual-channel multiphase fluid nuclear magnetic resonance online detection method, as described in the following embodiments. The principle of solving the problems of the dual-channel multiphase fluid nuclear magnetic resonance online detection method is similar to that of the dual-channel multiphase fluid nuclear magnetic resonance online detection device, so the dual-channel multiphase fluid nuclear magnetic resonance online detection method can be implemented by the dual-channel multiphase fluid nuclear magnetic resonance online detection device, and repeated parts are not described again.
Fig. 4 is a flowchart of a dual-channel multiphase fluid nmr online detection method according to an embodiment of the present invention, and as shown in fig. 4, the method includes:
step 402: the method comprises the following steps that single branch pipelines are arranged at two ends of a nuclear magnetic pipeline, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline and a second branch pipeline;
step 404: two ends of the first branch pipeline are respectively provided with a controllable switch;
step 406: placing two branch pipelines in a magnetic coverage area, wherein the magnetic coverage area comprises a gradient magnetic field and a nuclear magnetic resonance pulse sequence;
step 408: providing a dipole magnet, said magnetic footprint being disposed within a uniform magnetic field region generated by said magnet;
step 410: when the two controllable switches are turned off simultaneously, a first echo string data set corresponding to the first branch pipeline is obtained, a second echo string data set corresponding to the second branch pipeline is obtained, the content of each component in the multiphase fluid is detected according to the first echo string data set, the flow rate of the multiphase fluid is detected according to the second echo string data set, and the flow rate of each component in the multiphase fluid is determined according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
In one embodiment, further comprising:
and placing the nuclear magnetic pipeline along the horizontal direction, wherein the two branch pipelines are at the same horizontal height.
In one embodiment, the direction of the gradient magnetic field is parallel to the radial direction of the nuclear magnetic pipeline and perpendicular to the horizontal plane, and the gradient magnetic field is used for calibrating the position of each horizon when the multiphase fluid flows in the nuclear magnetic pipeline in a layered mode; the direction of a magnetic field generated by the bipolar magnet is radially parallel to the nuclear magnetic pipeline and is vertical to the horizontal plane.
In one embodiment, the content of each component in the multiphase fluid is detected from the first echo train data set by the following formula:
wherein, WiRepresents the percentage of the ith component; siRepresenting the corresponding spectral peak area of the ith component in a transverse relaxation time spectrum, wherein the transverse relaxation time spectrum is obtained by inverting the first echo string data set; HI (high-intensity)iRepresenting the hydrogen index of the ith component; k represents the number of components in the multiphase fluid.
The embodiment of the invention realizes the following technical effects: by arranging the single branch pipelines at the two ends of the nuclear magnetic pipeline and the two identical branch pipelines in the middle of the nuclear magnetic pipeline, the multiphase fluid can flow in through one end of the nuclear magnetic pipeline and flow out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, namely when the multiphase fluid simultaneously flows through the two branch pipelines, the fluid properties and the component contents of the multiphase fluid in the two branch pipelines are consistent; the two branch pipelines are simultaneously arranged in a magnetic coverage area of the antenna equipment and a uniform magnetic field area generated by a dipole magnet, namely, multiphase fluid flowing through the two branch pipelines can be magnetized by the magnetic coverage area of the antenna equipment and can also be magnetized by a uniform magnetic field generated by the dipole magnet and can also be scanned by a nuclear magnetic resonance pulse sequence, controllable switches are respectively arranged at two ends of the first branch pipeline, when the two controllable switches are simultaneously closed, the multiphase fluid in the first branch pipeline is static, and the multiphase fluid completely flows through the second branch pipeline, at the moment, the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short, the multiphase fluid is approximately seen as the consistency of fluid properties and component content, so as to obtain a first echo train data set corresponding to the first branch pipeline and a second echo train data set corresponding to the second branch pipeline, and detect the content of each component in the multiphase fluid according to the first echo train data set, and detecting the flow rate of the multi-phase fluid according to the second echo string data set, and determining the flow rate of each component in the multi-phase fluid according to the content of each component in the multi-phase fluid and the flow rate of the multi-phase fluid. Because the phase difference between the multiphase fluid in the first branch pipeline and the multiphase fluid flowing through the second branch pipeline is short when the first echo string data set and the second echo string data set are acquired, the multiphase fluid can be approximately seen as consistent in fluid property and component content, and then the static measurement and the flow measurement can be approximately simultaneously realized, so that the accuracy of the flow measurement result can be improved.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made to the embodiment of the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double-channel multiphase fluid nuclear magnetic resonance online detection device is characterized by comprising:
the device comprises a nuclear magnetic pipeline, wherein single branch pipelines are arranged at two ends of the nuclear magnetic pipeline, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline and a second branch pipeline;
the two controllable switches are respectively arranged at two ends of the first branch pipeline;
the antenna equipment comprises a first coil and a second antenna, wherein the first coil is used for transmitting a gradient magnetic field, and the second antenna is used for transmitting a nuclear magnetic resonance pulse sequence to respectively carry out layered scanning on the two branch pipelines and receive echo train data;
a dipole magnet, a magnetic footprint of the antenna apparatus being disposed within a uniform magnetic field region produced by the dipole magnet;
the control equipment is used for simultaneously controlling the closing and the opening of the two controllable switches;
and spectrometer equipment, configured to drive the first coil to emit a gradient magnetic field and drive the second antenna to emit a nuclear magnetic resonance pulse sequence when the two controllable switches are simultaneously turned off, obtain a first echo train data set corresponding to the first branch pipeline, obtain a second echo train data set corresponding to the second branch pipeline, detect the content of each component in the multiphase fluid according to the first echo train data set, detect the flow rate of the multiphase fluid according to the second echo train data set, and determine the flow rate of each component in the multiphase fluid according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
2. The dual-channel multiphase fluid nuclear magnetic resonance online detection device of claim 1, wherein the nuclear magnetic pipeline is placed in a horizontal direction, and the two branch pipelines are at the same horizontal height.
3. The dual-channel multiphase fluid nuclear magnetic resonance online detection device of claim 2, wherein the direction of the gradient magnetic field is parallel to the radial direction of the nuclear magnetic pipeline and perpendicular to the horizontal plane, and the gradient magnetic field is used for calibrating the position of each horizon when the multiphase fluid flows in the nuclear magnetic pipeline in a layered manner.
4. The dual-channel multiphase fluid nuclear magnetic resonance online detection device of claim 2, wherein the direction of the magnetic field generated by the bipolar magnet is parallel to the radial direction of the nuclear magnetic pipeline and perpendicular to the horizontal plane.
5. The dual-channel multiphase fluid nuclear magnetic resonance online detection device of claim 1, wherein the magnetic coverage area of the antenna device is positioned at the rear part in the uniform magnetic field area generated by the dipole magnet, and the multiphase fluid flows in the nuclear magnetic pipeline from front to back.
6. The dual channel multiphase fluid nmr online detection device of any one of claims 1-5, wherein the spectrometer device is specifically configured to detect the content of each component in the multiphase fluid from the first echo train data set by the following formula:
wherein, WiRepresents the percentage of the ith component; siRepresenting the corresponding spectral peak area of the ith component in a transverse relaxation time spectrum, wherein the transverse relaxation time spectrum is obtained by inverting the first echo string data set; HI (high-intensity)iRepresenting the hydrogen index of the ith component; k represents the number of components in the multiphase fluid.
7. A dual-channel multiphase fluid nuclear magnetic resonance online detection method is characterized by comprising the following steps:
the method comprises the following steps that single branch pipelines are arranged at two ends of a nuclear magnetic pipeline, the middle of the nuclear magnetic pipeline comprises two identical branch pipelines, multiphase fluid flows in through one end of the nuclear magnetic pipeline and flows out through the other end of the nuclear magnetic pipeline after flowing through the two branch pipelines, and the two branch pipelines comprise a first branch pipeline and a second branch pipeline;
two ends of the first branch pipeline are respectively provided with a controllable switch;
placing two branch pipelines in a magnetic coverage area, wherein the magnetic coverage area comprises a gradient magnetic field and a nuclear magnetic resonance pulse sequence;
providing a dipole magnet, said magnetic footprint being disposed within a uniform magnetic field region generated by said magnet;
when the two controllable switches are turned off simultaneously, a first echo string data set corresponding to the first branch pipeline is obtained, a second echo string data set corresponding to the second branch pipeline is obtained, the content of each component in the multiphase fluid is detected according to the first echo string data set, the flow rate of the multiphase fluid is detected according to the second echo string data set, and the flow rate of each component in the multiphase fluid is determined according to the content of each component in the multiphase fluid and the flow rate of the multiphase fluid.
8. The dual-channel multiphase fluid nuclear magnetic resonance online detection method of claim 7, further comprising:
and placing the nuclear magnetic pipeline along the horizontal direction, wherein the two branch pipelines are at the same horizontal height.
9. The dual-channel multiphase fluid nuclear magnetic resonance online detection method of claim 8, wherein the direction of the gradient magnetic field is parallel to the radial direction of the nuclear magnetic pipeline and perpendicular to the horizontal plane, and the gradient magnetic field is used for calibrating the position of each horizon when the multiphase fluid flows in the nuclear magnetic pipeline in a layered manner; the direction of a magnetic field generated by the bipolar magnet is radially parallel to the nuclear magnetic pipeline and is vertical to the horizontal plane.
10. The dual-channel multiphase fluid nuclear magnetic resonance online detection method according to any one of claims 7 to 9, wherein the content of each component in the multiphase fluid is detected according to the first echo train data set by the following formula:
wherein, WiRepresents the percentage of the ith component; siRepresenting the corresponding spectral peak area of the ith component in a transverse relaxation time spectrum, wherein the transverse relaxation time spectrum is obtained by inverting the first echo string data set; HI (high-intensity)iRepresenting the hydrogen index of the ith component; k represents the number of components in the multiphase fluid.
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