CN115876824A - System and method for detecting oil-water content of oil production well fluid - Google Patents
System and method for detecting oil-water content of oil production well fluid Download PDFInfo
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Abstract
The invention discloses a system for detecting the oil-water content of oil production well fluid, which comprises: a sample tube for introducing produced production well fluid; the pre-polarizer is arranged at the periphery of the sample tube and is used for pre-polarizing the oil production well fluid flowing through the sample tube; the detection body is arranged at the periphery of the sample tube and used for keeping the magnetizability of the pre-polarization treatment fluid and transmitting a radio frequency signal and receiving a nuclear magnetic resonance signal which is generated by the fluid in the sample tube under the excitation of the radio frequency signal and is conducted to the detection body; the signal transmitting and receiving device is connected with the detection body and is used for controlling the transmission of the radio frequency signal and receiving and processing the nuclear magnetic resonance signal to form an echo signal; and the upper computer is communicated with the signal transmitting and receiving device and is used for carrying out inversion calculation on the nuclear magnetic resonance echo signals to obtain oil-water content data. The invention improves the detection automation, the detected oil-water content is not influenced by oil-water emulsion, and the detection accuracy is higher.
Description
Technical Field
The invention relates to the technical field of oil extraction, in particular to a system and a method for detecting the oil-water content of oil well fluid.
Background
In the oil extraction engineering, the monitoring of the oil-water content of the fluid produced by the oil production well is an important index for measuring the oil well yield, evaluating the oil reservoir production degree, formulating an injection-production scheme and deploying a subsequent stable production well position, if the produced fluids of the oil production well and the oil production area can be monitored in real time, continuously, intelligently and comprehensively, the comprehensive produced fluid oil-water change continuous data of each oil production well can be obtained, and the produced fluid oil-water change of each oil production area can be obtained, so that the oil production automatic management and the regional injection-production big data analysis can be established, and then, important technical support is provided for adjusting the oil production, injection-production scheme and deploying the subsequent stable production well. In addition, the automatic and continuous detection can also realize the intellectualization and the modernization of enterprise production.
In the existing low-field nuclear magnetic resonance technology for detecting the water holdup of an oil well, some technologies are connected in parallel on a transmission pipeline of the oil production well, and discrete data are periodically acquired by pumping a sample. The correlation between the field detection result of the instrument and the measurement result of the traditional Dean-Stark distillation method reaches 99 percent. In addition, some techniques utilize optical fibers to transmit near infrared spectra to the well floor of the development well, to transmit infrared spectra from the surface, to detect downhole sensor data at the surface, and to analyze and calculate the oil, gas, and water content of the production well fluids, for adjusting the oil recovery scheme.
In the process of implementing the invention, the inventor finds that: in the two detection methods, although accurate data can be obtained by low-field nuclear magnetic resonance detection, the parallel oil extraction pipeline of the instrument obtains samples in a pumping mode, has a longer analysis period and cannot perform original state online detection on flowing oil extraction fluid; infrared optical detection not only requires sensors to be lowered into the well, but also requires substantial modification of the production well, and is complex to use and unsuitable for most well applications.
Further, for the technology of detecting the oil-water content of the oil recovery fluid in real time, although methods such as an electric desorption method, a densitometer method, a capacitance method, a microwave method and the like are described in the prior art, in the actual operation of an oil field, distillation methods and centrifugal methods are mainly adopted for measurement at present to obtain data more accurately. In addition, although there are many described automatic measurement methods, in the practical application process, each measurement method is greatly influenced by the properties and components of the oil recovery fluid, the detection error is large, and the error is larger and larger along with the accumulation of the operation time, so that the oil-water content of the oil recovery fluid cannot be quantitatively detected, and the data application value is not high. In addition, some methods such as an X-ray method and a gamma-ray method have certain risks to field operators, and do not conform to detection modes of environmental protection, health and safety. Therefore, at present, the oil field still mainly adopts a manual measurement method to measure the oil-water content, the method needs manual sampling analysis, the workload is large, the safety risk is large, the data analysis time is long, the delay is generally 1 to 3 days, and continuous and real-time analysis cannot be realized. Moreover, many current detection methods are difficult to detect the oil-water content of the oil-water emulsion, which is a cause of errors, and manual detection usually requires adding a demulsifier.
Therefore, in order to solve one or more of the above technical problems, the prior art needs to provide a new solution for continuously, online and accurately measuring the oil-water content of the oil production fluid on the oil production well, so as to meet the monitoring requirements of the oil production well and enable the acquired data to be applied to the information and digital oil field.
Disclosure of Invention
In order to solve the above technical problem, an embodiment of the present invention provides a system for detecting oil-water content of a production well fluid, including: a sample tube for introducing produced production well fluid; the pre-polarizer is arranged on the periphery of the sample tube and is used for pre-polarizing the oil production well fluid flowing through the sample tube; the detection body is arranged at the periphery of the sample tube and is used for keeping the magnetizability of the fluid subjected to the pre-polarization treatment, transmitting a radio frequency signal to the fluid and receiving a nuclear magnetic resonance signal generated by the fluid in the sample tube under the excitation of the radio frequency signal and conducted to the detection body; the signal transmitting and receiving device is connected with the detection body and is used for controlling the transmission of the radio frequency signal and receiving and processing the nuclear magnetic resonance signal so as to form a corresponding echo signal; and the upper computer is communicated with the signal transmitting and receiving device and is used for carrying out inversion calculation on the nuclear magnetic resonance echo signals to obtain oil-water content data.
Preferably, the system further comprises: and the constant temperature device is connected with the pre-polarizer and the detection body and is used for heating the pre-polarizer and the detection body at constant temperature according to a preset temperature.
Preferably, two ends of the sample tube are respectively connected with an outlet of the oil production well and an oil production conveying pipeline.
Preferably, the inlet end of the sample tube is connected with the oil extraction conveying pipeline through a first valve, and the outlet end of the sample tube is connected with the oil extraction conveying pipeline through a second valve.
Preferably, the detection body comprises: a detection magnet configured as a rectangular magnet and mounted on the periphery of the sample tube through a yoke; and the detection probe is arranged on the outer wall of the sample tube, is arranged in the uniform magnetic field area of the detection magnet and is used for transmitting the radio-frequency signal and detecting the nuclear magnetic resonance signal.
Preferably, the signal transmitting and receiving apparatus includes: the first control module is used for setting and adjusting the preset temperature of the constant temperature device and controlling the switching of the signal state of the second control module; and the second control module is used for transmitting the radio-frequency signal corresponding to the magnet frequency of the detection magnet in a signal transmitting state, switching the current signal transmitting state to a signal receiving state after the signal transmitting is finished so as to receive the nuclear magnetic resonance signal in real time, and finally amplifying and conditioning the nuclear magnetic resonance signal to form the nuclear magnetic resonance echo signal.
Preferably, the system further comprises: the gas-liquid separation device is positioned at the inlet of the sample tube and is used for introducing the oil production well fluid after gas-liquid separation into the sample tube; and the inlet of the gas path pipeline is connected with the gas-liquid separation device, the outlet of the gas path pipeline is connected with the outlet of the sample tube, and the gas path pipeline is used for conveying the separated gas to the outlet of the sample tube through a gas conveying pump in the pipeline, so that the detected oil production well fluid is mixed with the conveyed gas and then is introduced into the oil production conveying pipeline.
Preferably, the inner wall of the sample tube is coated with an oil-repellent coating.
Preferably, the upper computer is further configured to calibrate and automatically correct the nuclear magnetic resonance frequency and the temperature of the magnet resonance frequency variation error of the detection body at different temperatures under the cooperation of the signal transmitting and receiving device.
In another aspect, an embodiment of the present invention further provides a method for detecting oil-water content of a production well fluid, where the method is implemented by using the system as described above, and the method includes: introducing the produced oil production well fluid into a sample tube; pre-polarizing the production well fluid flowing through the sample tube; maintaining the magnetizability of the fluid subjected to the pre-polarization treatment, transmitting a radio frequency signal to the fluid, and receiving a nuclear magnetic resonance signal which is generated by the fluid in the sample tube under the excitation of the radio frequency signal and is conducted to the detection body; receiving and processing the nuclear magnetic resonance signal to form a corresponding echo signal; and carrying out inversion calculation on the nuclear magnetic resonance echo signals to obtain oil-water content data.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention provides a system and a method for detecting oil-water content of oil production well fluid. The scheme is installed in a single well or a metering station, the oil-water content is monitored in real time, the pre-polarization treatment is mainly carried out when a produced oil well fluid sample enters a pre-polarization magnet and then enters a detection magnet, a circuit system sends a detection radio frequency signal and transmits the detection radio frequency signal through a probe in the detection body to excite a sample nuclear magnetic resonance signal, then the circuit system receives the nuclear magnetic resonance signal and carries out amplification, conditioning and other treatments, and an upper computer collects, processes, analyzes and calculates the data so as to obtain oil-containing water and the like, and the data are transmitted to a digital and intelligent monitoring center through a wireless network. The invention can detect the oil and water of a single well, effectively solves the problem that the oil and water content of the fluid of the oil production well can not be accurately detected at present, and solves the single well monitoring problem of a remote well; the oil-water content is detected by using the low-field nuclear magnetic resonance principle, the influence of oil-water emulsion is avoided, the oil-water content of the oil extraction fluid can be accurately detected, and the detection accuracy is higher; the detection automation is improved, the labor intensity of workers is reduced, and the safety and health risks of manual operation are reduced; the detection instrument is provided with a pre-polarization and constant temperature system, so that the oil-water content can be continuously and accurately detected, the nuclear magnetic common frequency is kept fixed, and the detection accuracy is improved; the detection result solves the difficulty that the oil-water content of the oil extraction fluid can not be automatically and accurately detected and monitored in a network in a digital information oil field, can realize the oil-water content monitoring of an oil extraction area, fully know the oil-water change and the motion rule of oil extraction, follow up and adjust an oil extraction scheme in real time, and scientifically deploy subsequent well positions; the sample tube can be directly connected to the outlet of the existing oil production well to form an oil production flow channel which is the same as the original pipeline, or is parallel to the original pipeline, and a three-way valve is adopted to control the fluid running path, so that the usability is improved, and the transformation cost is saved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
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 specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of an overall structure of a system for detecting a content of oil and water in a production well fluid according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a system for detecting the oil-water content of a production well fluid according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a recovery fluid bypass in which a sample tube is a recovery transport tube in the system for detecting the oil-water content of a recovery well fluid according to the embodiment of the present application.
FIG. 4 is a schematic flow chart of an online detection method formed during operation of the system for detecting the oil-water content of the production well fluid according to the embodiment of the application.
FIG. 5 is a step diagram of a method for detecting the oil and water content of a production well fluid according to an embodiment of the present application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features in the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
In the oil extraction engineering, the monitoring of the oil-water content of the fluid produced by the oil production well is an important index for measuring the oil well yield, evaluating the oil reservoir production degree, formulating an injection-production scheme and deploying a subsequent stable production well position, if the produced fluids of the oil production well and the oil production area can be monitored in real time, continuously, intelligently and comprehensively, the comprehensive produced fluid oil-water change continuous data of each oil production well can be obtained, and the produced fluid oil-water change of each oil production area can be obtained, so that the oil production automatic management and the regional injection-production big data analysis can be established, and then, important technical support is provided for adjusting the oil production, injection-production scheme and deploying the subsequent stable production well. In addition, the automatic and continuous detection can also realize the intellectualization and the modernization of enterprise production.
In the existing low-field nuclear magnetic resonance technology for detecting the water holdup of an oil well, some technologies are connected in parallel on a transmission pipeline of the oil production well, and discrete data are periodically acquired by pumping a sample. The correlation between the field detection result of the instrument and the detection result of the traditional Dean-Stark distillation method reaches 99 percent. In addition, some techniques utilize optical fibers to transmit near infrared spectra to the well floor of the development well, to transmit infrared spectra from the surface, to detect downhole sensor data at the surface, and to analyze and calculate the oil, gas, and water content of the production well fluids, for adjusting the oil recovery scheme.
In the process of implementing the invention, the inventor finds that: in the two detection methods, although accurate data can be obtained by low-field nuclear magnetic resonance detection, the parallel oil production line of the instrument obtains samples in a pumping mode, has a longer analysis period and cannot perform original state online detection on flowing oil production fluid; infrared optical detection not only requires sensors to be lowered into the well, but also requires a great deal of modification of the production well, and the method of use is complex and not suitable for most well applications.
Further, for the technology of detecting the oil-water content of the oil recovery fluid in real time, although methods such as an electric desorption method, a densitometer method, a capacitance method, a microwave method and the like are described in the prior art, in the actual operation of an oil field, distillation methods and centrifugal methods are mainly adopted for measurement at present to obtain data more accurately. In addition, although there are many described automatic measurement methods, in the practical application process, each measurement method is greatly influenced by the properties and components of the oil recovery fluid, the detection error is large, and the error is larger and larger along with the accumulation of the operation time, so that the oil-water content of the oil recovery fluid cannot be quantitatively detected, and the data application value is not high. In addition, some methods such as an X-ray method and a gamma-ray method have certain risks to field operators, and do not conform to detection modes of environmental protection, health and safety. Therefore, at present, the oil field still mainly adopts a manual measurement method to measure the oil-water content, the method needs manual sampling analysis, the workload is large, the safety risk is large, the data analysis time is long, the delay is generally 1 to 3 days, and continuous and real-time analysis cannot be realized. Moreover, many current detection methods are difficult to detect the oil-water content of the oil-water emulsion, which is a cause of errors, and manual detection usually requires the addition of a demulsifier.
Therefore, in order to solve one or more of the above technical problems, the present invention provides a system for detecting the oil-water content of a production well fluid and a method for implementing the same. The scheme comprises the following steps: the sample tube is used for accommodating the detected fluid, and the outlet of the sample tube is connected with the oil extraction conveying pipeline so as to directly convey the extracted fluid to the back-end equipment after detection is finished; the pre-polarizer is arranged on the periphery of the sample tube and is used for pre-polarizing the oil production well fluid flowing through the sample tube; the detecting body is arranged on the periphery of the sample tube and used for transmitting radio frequency signals to the oil well fluid subjected to the pre-polarization treatment and acquiring nuclear magnetic resonance signals generated by the oil well fluid under the excitation of the radio frequency signals; and the upper computer is communicated with the signal transmitting and receiving device and is used for carrying out inversion calculation on the nuclear magnetic resonance detection echo signals to obtain oil-water content data.
Therefore, the oil-water content detection system based on the low-field nuclear magnetic resonance principle can continuously, online and accurately measure the oil-water content of the oil production fluid on the oil production well, has a simple instrument structure, meets the monitoring requirement of the oil production well, and enables the obtained data to be applied to the informationized and digitized oil field. Because the low-field nuclear magnetic resonance principle is not influenced by the oil-water emulsion, the oil-water content of the oil extraction fluid can be accurately detected, and the detection accuracy is higher. In addition, the invention can directly detect the oil-water content of single-well oil extraction, is used for replacing the traditional manual sampling and analysis of oil extraction flow beads, improves the data acquisition density and real-time performance, improves the automation level and the oil field informatization degree, and helps to monitor the oil extraction well state in real time, adjust the oil extraction scheme in time, know the underground oil-gas migration rule and scientifically deploy subsequent well positions.
Example one
Fig. 1 is a schematic diagram of an overall structure of a system for detecting a content of oil and water in a production well fluid according to an embodiment of the present disclosure. As shown in fig. 1, the system for detecting the oil-water content of the oil production well fluid (hereinafter referred to as "oil-water content detection system") according to the present invention at least includes the following components: the device comprises a sample tube A, a pre-polarizer B, a detection body C, a signal transmitting and receiving device D and an upper computer E.
The inlet of the sample tube A is introduced into the fluid of the oil production well which is produced by the current oil production well in real time, and the outlet of the sample tube A is connected with an oil production conveying pipeline. The sample tube A is used for introducing produced oil production well fluid. In the practical application process, the oil extraction conveying pipeline is a pipeline for conveying the fluid extracted by the oil extraction well in real time to the next processing link of the oil extraction plant (namely the subsequent fluid processing link after extraction), and the detection process in the embodiment of the invention is completed in the conveying flowing process from the extraction outlet (or a metering station) to the next processing link of the oil extraction plant by the design of communicating the outlet of the sample tube A with the oil extraction conveying pipeline. That is to say, the oil production well fluid which is produced in real time in the detection process passes through the sample tube a in the pipeline circuit which is conveyed to the oil production plant, so that the oil-water content detection function is realized when the oil production well fluid flows through the sample tube a. Therefore, according to the position and the structural state of the sample tube A, corresponding application environment and detection scene limiting conditions are provided for the oil-water content detection system provided by the embodiment of the invention.
The pre-polarizer B is arranged on the periphery of the sample tube A. The pre-polarizer B is used for pre-polarizing the production well fluid flowing through the sample tube A. In the embodiment of the invention, the pre-polarizer B adopts a pre-polarizing magnet, and the fluid sample of the oil production well enters the sample tube A and enters the pre-polarizer B for pre-polarizing treatment of the fluid sample.
The detection body C is connected to the pre-polarizer B, is located behind the pre-polarizer B in the fluid flow direction, and is similarly attached to the periphery of the sample tube a. In the embodiment of the invention, the detection body C is used for maintaining the polarization of the pre-polarized fluid and transmitting a radio frequency signal to the oil production well fluid subjected to pre-polarization treatment, and is also used for collecting a nuclear magnetic resonance signal generated by the fluid in the pipe and conducted to the detection body C under the excitation of the radio frequency signal. The signal transmitting and receiving device D is electrically connected to the detection body C. The signal transmitting and receiving device D is used for controlling the transmission of the radio frequency signal, and after receiving the nuclear magnetic resonance signal acquired by the detecting body C, the signal transmitting and receiving device D forms a corresponding echo signal after processing. The upper computer E is communicated with the signal transmitting and receiving device D. The upper computer E is used for acquiring and performing inversion calculation on the nuclear magnetic resonance detection echo signals obtained from the signal transmitting and receiving device D, and accordingly oil-water content data are obtained. The upper computer E and the signal transmitting and receiving device D are communicated in a wireless mode.
Fig. 2 is a schematic structural diagram of a system for detecting the oil-water content of a production well fluid according to an embodiment of the present disclosure. The internal structure and function of the oil-water content detection system according to the embodiment of the present invention will be described in detail with reference to fig. 2.
As shown in fig. 2, in the first embodiment of the present invention, the sample tube 26 is connected to the outlet of the oil production well and the oil production transportation pipeline at two ends. Further, both ends of the production well riser 21 are connected with a production well and a production oil pipeline, respectively. At this time, the sample tube 26 is integrated in the production well riser 21. That is, when the sample tube 26 is connected to the production well riser 21 in a direct connection manner, the fluid passage of the sample tube 26 and the fluid passage of the production well riser 21 are shared, in which case, the inlet end of the sample tube 26 is connected to the outlet of the production well through a part of the production well riser 21, and the outlet end of the sample tube 26 is connected to the production transfer line through another part of the production well riser 21.
The pre-polarizing magnet 23 is configured as a rectangular magnet or a cylindrical magnet, and the outer periphery of the sample tube 26 is mounted by a (first) yoke of a rectangular shape (when the pre-polarizing magnet is a rectangular magnet) or a cylindrical shape (when the pre-polarizing magnet is a cylindrical magnet). Wherein the (first) yoke has a high magnetic permeability. On the high-magnetic-conductance yoke, the magnet plates with equal two sides can more easily generate a large-space uniform magnetic field in the magnet plates, and the high-magnetic-conductance yoke can control magnetic lines of force in the magnet plates, so that the outside of the magnet has no magnetic field, and the high-magnetic-conductance yoke also ensures safety and convenient application while obtaining high-precision detection signals.
Further, referring to fig. 2, the above-described detecting body C includes a detecting magnet 24 and a detecting probe 27. The detection magnet 24 is configured as a rectangular magnet or a cylindrical magnet, and is also mounted on the periphery of the sample tube 26 via a rectangular-shaped (when the detection body is a rectangular magnet) or cylindrical-shaped (when the detection body is a cylindrical magnet) (second) yoke having high magnetic permeability characteristics. Wherein the first yoke and the second yoke have the same specification and size, and further the specification and size of the detection magnet 24 are made to coincide with the specification and size of the pre-polarizing magnet 23.
The detecting probe 27 is installed on the outer wall of the sample tube 26 and is arranged at the uniform magnetic field area in the detecting magnet 24, and is respectively used for transmitting radio frequency signals with specified frequency under the control of the signal transmitting and receiving device D and detecting and receiving nuclear magnetic resonance signals generated by the oil production well fluid. The size of the homogeneous magnetic field region in the detection magnet 24 can be compatible with the diameter of the sample tube 26, namely, the tube diameters are kept consistent, so that the flow of the fluid in the oil production well under the former state (the state during production) is ensured, the content of the fluid can be detected under the original operation condition, and the detection accuracy is further improved.
In addition, the oil-water content detection device of the embodiment of the invention further comprises a constant temperature device 25. The thermostat 25 is connected to the pre-polarizer 23, the detector C, and the signal transmitter/receiver D. The thermostat 25 is used to heat the pre-polarizer 23 and the detecting body C at a constant temperature (according to a preset temperature) under the control of the preset temperature set by the signal transmitting and receiving device D. The thermostatic device 25 is capable of providing heating to the pre-polarizing magnet 23 and the detection magnet 24 simultaneously and maintaining a constant temperature, thereby stabilizing the magnets at a fixed resonance frequency and further improving the accuracy of detection.
The signal transmitting and receiving device D is integrated in the measurement and control circuit box 28. The measurement and control circuit box 28 adopts an explosion-proof electronic cabinet, and can safely operate at the wellhead of the oil production well. The signal transmitting and receiving device D at least comprises: a first control module 30 and a second control module 29. The first control module 30 is used for setting and adjusting a preset temperature of the thermostat 25. The first control module 30 is further configured to detect real-time output temperatures of the pre-polarizer 23 and the detection magnet 24 in the detection object C, and adjust the heating temperature to maintain a preset temperature according to the detected real-time output temperature. In this way, the resonance frequency of the magnets 23, 24 can be kept in a stable state at a preset temperature.
Further, when it is detected that the real-time output of any one of the pre-polarizer 23 and the detection magnet 24 exceeds/does not reach the preset temperature, the output temperature of the corresponding magnet needs to be subjected to temperature regulation control, so that the real-time output temperatures of both the two magnets 23 and 24 reach or approach the preset temperature.
The second control module 30 is configured to transmit a radio frequency signal corresponding to the magnet frequency of the detection magnet 24 in the signal transmission state, and (automatically) switch the current signal transmission state to the signal reception state after the signal transmission is completed, and then receive a nuclear magnetic resonance signal of the oil production fluid excited by the radio frequency signal, and then receive and acquire a nuclear magnetic resonance signal (the nuclear magnetic resonance signal is detected by the detection probe 27) generated by the oil production well fluid under the action of the radio frequency signal transmitted by the detection probe 27 in the signal reception state, amplify and condition the nuclear magnetic resonance signal, and then convert the received nuclear magnetic resonance signal into a corresponding echo signal, thereby forming a nuclear magnetic resonance detection echo signal.
In addition, in the embodiment of the present invention, the first control module 29 is further configured to control switching of the signal state of the second control module 30. When a radio frequency signal needs to be transmitted to the fluid in the detection process, the first control module 29 is configured to generate a transmission instruction under the driving of the switching signal, and send the transmission instruction to the second control module 30, so that the second control module 30 sets its own state as a signal transmission state under the control of the transmission instruction (the transmission instruction contains frequency information of the radio frequency signal to be transmitted), so as to establish a transmission signal transmission control path between the second control module 30 and the detection probe 27; when a nuclear magnetic resonance echo signal generated by the fluid needs to be received in the detection process, the first control module 29 is further configured to generate a receiving instruction under the driving of the switching signal, and send the receiving instruction to the second control module 30, so that the second control module 30 sets its own state to a signal receiving state under the control of the receiving instruction, so as to establish a signal receiving and transmitting control path between the second control module 30 and the detection probe 27.
It should be noted that, in the embodiment of the present invention, the switching signal is a square wave signal with a preset duty ratio. The duty ratio is determined according to the time of the radio frequency signal transmitting phase and the time of the fluid generating the nuclear magnetic resonance signal.
Further, when the second control module 30 generates the nmr check echo signal, the second control module 30 feeds back the nmr check echo signal generated in real time to the first control module 29. Since the upper computer E (34) is wirelessly connected to the signal transmitting and receiving device D, referring to fig. 2, the signal transmitting and receiving device D according to the embodiment of the present invention further includes a communication module 31.
Further, the first control module 29 communicates with the upper computer 34 through the communication module 31. When the first control module 29 obtains the nuclear magnetic resonance detection echo signal in real time, the first control module 29 is further configured to transmit the nuclear magnetic resonance detection echo signal obtained in real time to a wireless/network port 33 at an upper computer end through a wireless/network transmission port 32 at a detection end via a communication module 31, so that the upper computer 34 receives the echo signal, calculates the oil-water content (performing inversion calculation according to the echo signal received in real time to obtain oil-water content data), and stores a calculation result. In addition, the upper computer 34 not only needs to store the calculation result locally, but also needs to transmit the required oil-water content data to a digital information center of a remote oil production plant.
In addition, the upper computer 34 is also configured to perform tasks such as setting a preset temperature, configuring a switching signal, adjusting a frequency of a radio frequency signal, and the like through communication with the first control module 29 in the signal transmitting and receiving device D, so that the real-time output temperature of each magnet reaches a preset temperature condition, the maintaining time of the signal transmitting state and the signal receiving state satisfies an actual detection condition, and the radio frequency signal satisfying the characteristic conditions of the magnet and the fluid and realizing the resonance function of the magnet is transmitted.
The upper computer 34 is also used to calibrate the resonance rate and temperature of the magnet resonance frequency error of the detection body C at different temperatures in cooperation with the signal transmitting and receiving device D, and automatically correct the error at regular intervals. Specifically, before the implementation of the oil-water content detection, the upper computer 34 configures different preset temperatures for the pre-polarizer and the detection body and configures radio frequency signals with different frequencies for the detection body through the signal transmitting and receiving device D, and implements an oil-water content detection experiment under the conditions of different preset temperatures and radio frequency signals with different frequencies to calibrate magnet errors corresponding to different temperatures, so that echo signals generated by the signal transmitting and receiving device D are more accurately matched by using the calibrated magnet resonance frequency data at different temperatures, and the detection precision of the instrument is further improved.
In addition, in order to improve the accuracy of the oil-water content detection result, the oil-water content detection system according to the embodiment of the present invention further includes: a gas-liquid separation device 12 and a gas path pipe (not numbered). The gas-liquid separation device 12 is located at an inlet of the sample tube 26, and is used for introducing the oil production well fluid after gas-liquid separation into the sample tube 26. The inlet of the gas circuit pipeline is connected with the gas-liquid separation device, and the outlet of the gas circuit pipeline is connected with the outlet of the sample tube 26. The gas pipeline is used for conveying the separated gas (oil production well fluid) to the outlet of the sample tube 26 through the gas conveying pump 19 in the pipeline, so that the detected oil production well fluid and the conveyed gas are mixed (gas recovery is completed) and are conveyed into the oil production conveying pipeline. Therefore, the invention can also detect the oil-water content of the oil production well fluid after gas-liquid separation treatment so as to achieve the aim of further improving the detection precision, and finally, the gas and the separated oil production well fluid are mixed (recovered) and then the produced oil production well fluid is continuously conveyed to an oil production plant through an oil production conveying pipeline for further treatment.
FIG. 4 is a schematic flow chart of an online detection method formed during operation of the system for detecting the oil-water content of the production well fluid according to the embodiment of the application. As shown in figure 4, the oil production well fluid of S11 oil recovery well head (or measurement station) carries out the preliminary separation of gas and liquid through 12 gas-liquid separation devices, and S12 gas-liquid separation device is the optional installed part earlier, if at the measurement station, because the fluid gas content after the multiwell converges can increase, and easily maintains in the station, can install gas-liquid separation device, when single well is measured, also can not install if do not possess the condition, gas-liquid separation device can improve to a certain extent and detect the precision. S13, the separated oil production fluid enters a detection instrument through a sample pipe, S14, after the oil production fluid enters a pre-polarizing magnet, the pre-polarizing magnet performs pre-polarizing treatment on the oil production fluid, S15, the oil production fluid which is subjected to pre-polarizing enters a detection magnet to be detected, and S20, after the detection is finished, the oil production fluid and the separated gas are mixed and then flow into an oil pipeline again.
When detecting, the magnet control by temperature change provides constant temperature heating for pre-polarizing magnet and detection magnet, makes the magnet stabilize at fixed resonant frequency, and further through the heating, prevents that wax from bonding in the sample cell inner wall, improves the precision that detects. The detection probe detects the sample, emits a radio frequency signal for exciting a nuclear magnetic resonance signal, and receives the nuclear magnetic resonance signal generated by the sample. S16, the second control module sends radio frequency signals to the detection probe, the radio frequency signals excite detection fluid in the sample tube through the detection probe to generate nuclear magnetic resonance signals, then the second control module is rapidly switched to a signal receiving state to receive the nuclear magnetic resonance signals generated by the fluid received by the detection probe, the nuclear magnetic resonance signals are amplified and subjected to signal conditioning through the amplifier to obtain nuclear magnetic resonance detection echo signals, the first control module acquires the echo signals, meanwhile, the first control module also controls the communication module to transmit the acquired echo signals to a wireless/network transmission interface of an upper computer end through the wireless/network transmission interface of the detection end, S17 is received, acquired, calculated and stored through a detection program installed in the upper computer, and finally the upper computer transmits the processed data to a digital information center of an oil extraction plant. S19, gas generated by the gas-liquid separation device can be directly input into a gas pipeline of the oil production plant or returned to fluid of the oil production well through a gas delivery pump to enter the next processing link of the oil production plant.
Example two
In order to improve the maintenance convenience of the oil-water content detection system in the embodiment of the present invention, the fluid passage formed by the sample tube 26 may be modified into an oil recovery fluid bypass of an oil recovery transportation pipeline in the embodiment of the present invention. Fig. 3 is a schematic structural diagram of a recovery fluid bypass in which a sample tube is a recovery transport tube in the system for detecting the oil-water content of a recovery well fluid according to the embodiment of the present application.
In a second embodiment of the invention, as shown in fig. 3, the inlet end of the sample tube 26 is connected to the production tubing via a (first) valve 41, and the outlet end of the sample tube is connected to the production tubing via a (second) valve 41. At this time, the sample tube 26 is constructed in a U-shaped structure. That is, when the sample tube 26 is connected to the production well riser 21 in a bypass manner, the fluid passage of the sample tube 26 is a bypass pipeline of the fluid passage of the production well riser 21, and at this time, the inlet end of the sample tube 26 is connected to the production well riser 21, and the outlet end of the sample tube 26 is connected to the production well riser 21, so that the sample tube 26 is indirectly connected to the production transport pipeline in a manner that the outlet end of the production well riser 21 is connected to the production transport pipeline.
Wherein, the valve 41 is a three-way valve device. Thus, the fluid path formed by the sample tubing 26 provides a production fluid bypass for the production tubing. Specifically, in the embodiment of the present invention, a three-way valve 41 is installed on the production riser 21 to form the production fluid bypass 22, and the three-way valve 41 sets the flow direction of the produced production well fluid by rotating a switch. Thus, although the installation mode increases the installation complexity, the maintenance and the safe operation of the instrument can be ensured. When oil-water content detection is performed, the three-way valve 41 is rotated to enable the produced oil well fluid to enter the oil production fluid bypass 22 and continuously flow into the sample tube 26, so that the produced oil well fluid enters a detection instrument (oil-water content detection system) and is detected according to the flow described in the first embodiment. When the inspection instrument and the bypass line need to be maintained, the three-way valve 41 is rotated to enable the oil production fluid to flow along the oil production riser 21 without entering the oil production fluid bypass 22, and the oil production well fluid is conveyed to an oil production plant through an oil production conveying pipeline at the output end of the riser 21, so that the inspection instrument is convenient to use and maintain, and the oil production operation work is not influenced.
The detection system provided by the embodiment of the invention is arranged at the outlet of the oil production well, the sample tube can be directly connected with the oil production well head to form a passage which is the same as the original oil production passage, or the original oil production passage is reserved for standby, so that the sample tube is parallel to the original passage, and the running path of fluid is controlled by the three-way valve, thereby improving the safety and maintainability of the detection system.
EXAMPLE III
Based on the oil-water content detection system, the invention also provides a method for detecting the oil-water content of the oil production well fluid (hereinafter referred to as the oil-water content detection method). The oil-water content detection method provided by the embodiment of the invention is realized by using the oil-water content detection system.
FIG. 5 is a step diagram of a method for detecting the oil and water content of a production well fluid according to an embodiment of the present application. As shown in fig. 5, the method for detecting oil and water content according to the embodiment of the present invention includes the following steps: s501, introducing the produced oil production well fluid into a sample pipe; step S502, pre-polarizing the oil production well fluid flowing through the sample pipe by a pre-polarizer; step S503, keeping the magnetization of the fluid after the pre-polarization treatment and transmitting a radio frequency signal to the fluid, and receiving a nuclear magnetic resonance signal which is generated by the fluid in the tube under the excitation of the radio frequency signal and is transmitted to the detection body; step S504, receiving and processing (amplifying and conditioning) the nuclear magnetic resonance signal so as to form a corresponding echo signal; and S505, carrying out inversion calculation on the nuclear magnetic resonance detection echo signal to obtain oil-water content data.
The embodiment of the invention provides a system and a method for detecting the oil-water content of a fluid of a production well. The scheme is installed in a single well or a metering station, the oil-water content is monitored in real time, the oil production well fluid sample is subjected to pre-polarization treatment when entering a pre-polarization magnet and then enters a detection magnet, a detection radio frequency signal is sent by a circuit system and is emitted through a probe in the detection body, a sample nuclear magnetic resonance signal is excited, then the circuit system receives the nuclear magnetic resonance signal and performs amplification, conditioning and other treatments, and an upper computer performs acquisition, processing, analysis and calculation to obtain oil-containing water and other data, and the data are transmitted to a digital and intelligent monitoring center through a wireless network. The invention can detect the oil and water of a single well, effectively solves the problem that the oil and water content of the fluid of the oil production well can not be accurately detected at present, and solves the single well monitoring problem of a remote well; the low-field nuclear magnetic resonance principle is utilized to detect the oil-water content, and the oil-water content is not influenced by oil-water emulsion (because the oil extraction fluid contains the emulsion, if the demulsification is incomplete in conventional detection, the oil-in-water or oil-in-water content in the fluid can be uniformly calculated as oil content or water content, so that errors are caused, but the low-field nuclear magnetic resonance provided by the invention is not influenced by the emulsion), the oil-water content in the oil extraction fluid can be accurately detected, and the detection accuracy is higher; the detection automation is improved, the labor intensity of workers is reduced, and the safety and health risks of manual operation are reduced; the detection instrument is provided with a pre-polarization and constant temperature system, so that the oil-water content can be continuously and accurately detected, the fixation of nuclear magnetic common frequency is kept, and the detection accuracy is improved; the detection result solves the difficulty that the oil-water content of the oil extraction fluid can not be automatically and accurately detected and monitored in a network in a digital information oil field, can realize the oil-water content monitoring of an oil extraction area, fully know the oil-water change and the motion rule of oil extraction, follow up and adjust an oil extraction scheme in real time, and scientifically deploy subsequent well positions; the sample tube can be directly connected to the outlet of the existing oil production well to form an oil production flow channel which is the same as the original pipeline, or is parallel to the original pipeline, and a three-way valve is adopted to control the fluid running path, so that the usability is improved, and the transformation cost is saved.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It is to be understood that the disclosed embodiments of this invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A system for detecting the oil and water content of a production well fluid, comprising:
a sample tube for introducing produced production well fluid;
the pre-polarizer is arranged on the periphery of the sample tube and is used for pre-polarizing the oil production well fluid flowing through the sample tube;
the detection body is arranged at the periphery of the sample tube and is used for keeping the magnetizability of the fluid subjected to the pre-polarization treatment, transmitting a radio frequency signal to the fluid and receiving a nuclear magnetic resonance signal generated by the fluid in the sample tube under the excitation of the radio frequency signal and conducted to the detection body;
the signal transmitting and receiving device is connected with the detection body and is used for controlling the transmission of the radio frequency signals and receiving and processing the nuclear magnetic resonance signals so as to form corresponding echo signals;
and the upper computer is communicated with the signal transmitting and receiving device and is used for carrying out inversion calculation on the nuclear magnetic resonance echo signals to obtain oil-water content data.
2. The system of claim 1, further comprising:
and a constant temperature device connected to the pre-polarizer and the detection body, for heating the pre-polarizer and the detection body at a constant temperature according to a preset temperature.
3. The system of claim 2, wherein the sample tube is connected at both ends thereof to the outlet of the oil production well and the oil production transfer pipe, respectively.
4. The system of claim 2, wherein the inlet end of the sample tube is connected to the production line through a first valve and the outlet end of the sample tube is connected to the production line through a second valve.
5. The system of claim 2, wherein the detection body comprises:
a detection magnet configured as a rectangular magnet and mounted on the periphery of the sample tube through a yoke;
and the detection probe is arranged on the outer wall of the sample tube, is arranged in the uniform magnetic field area of the detection magnet and is used for transmitting the radio-frequency signal and detecting the nuclear magnetic resonance signal.
6. The system of claim 5, wherein the signal transmitting and receiving device comprises:
the first control module is used for setting and adjusting the preset temperature of the constant temperature device and controlling the switching of the signal state of the second control module;
and the second control module is used for transmitting the radio-frequency signal corresponding to the magnet frequency of the detection magnet in a signal transmitting state, switching the current signal transmitting state to a signal receiving state after the signal transmitting is finished so as to receive the nuclear magnetic resonance signal in real time, and finally amplifying and conditioning the nuclear magnetic resonance signal to form the nuclear magnetic resonance echo signal.
7. The system according to any one of claims 1 to 6, further comprising:
the gas-liquid separation device is positioned at the inlet of the sample tube and is used for introducing the oil production well fluid subjected to gas-liquid separation into the sample tube;
and the inlet of the gas path pipeline is connected with the gas-liquid separation device, the outlet of the gas path pipeline is connected with the outlet of the sample tube, and the gas path pipeline is used for conveying the separated gas to the outlet of the sample tube through a gas conveying pump in the pipeline, so that the detected oil production well fluid is mixed with the conveyed gas and then is introduced into the oil production conveying pipeline.
8. The system of any one of claims 1-7, wherein the inner wall of the sample tube is coated with an oil-repellent coating.
9. The system according to any one of claims 1 to 8,
and the upper computer is also used for calibrating and automatically correcting the nuclear magnetic resonance frequency and the temperature of the magnet resonance frequency change error of the detection body at different temperatures under the cooperation of the signal transmitting and receiving device.
10. A method for detecting the oil and water content of a production well fluid, the method being implemented with a system according to any one of claims 1 to 9, the method comprising:
introducing the produced oil production well fluid into a sample tube;
pre-polarizing the production well fluid flowing through the sample tube;
maintaining the magnetizability of the fluid subjected to the pre-polarization treatment, transmitting a radio frequency signal to the fluid, and receiving a nuclear magnetic resonance signal generated by the fluid in the sample tube under the excitation of the radio frequency signal and transmitted to the detection body;
receiving and processing the nuclear magnetic resonance signal to form a corresponding echo signal;
and carrying out inversion calculation on the nuclear magnetic resonance echo signals to obtain oil-water content data.
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| CN202110924218.6A CN115876824A (en) | 2021-08-12 | 2021-08-12 | System and method for detecting oil-water content of oil production well fluid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110924218.6A CN115876824A (en) | 2021-08-12 | 2021-08-12 | System and method for detecting oil-water content of oil production well fluid |
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