U-shaped geothermal well temperature monitoring device and method

Abstract

The invention relates to the technical field of oil and gas exploitation, in particular to a U-shaped geothermal well temperature monitoring device and method. The U-shaped geothermal well temperature monitoring device comprises a sensing probe, a sheath is arranged outside the sensing probe, a vacuum tube is arranged in the sheath, a mounting frame for sequentially mounting a laser receiver, a convex lens and a laser generator from top to bottom is arranged in the vacuum tube, a thermocouple is arranged at the bottom end of the sensing probe, and the thermocouple is connected with the laser generator through a connecting contact. And transmission equipment is connected behind the sensing probe. The thermocouple is used as induction equipment, the measurement accuracy of the device is improved, the working process is simple, operation is convenient, stability is good, the device can still work normally in an extreme environment, thermocouple parts are sensitive to temperature, real-time temperature measurement data of measurement points are more accurate, optical signals are formed through the laser transmitter and the convex lens and enter the optical fiber to be transmitted, and the measurement accuracy is improved. The signal is stable, the service life is long, and in the actual working process, the steps are simple, the method is not easily influenced by the external environment, and stability and precision are high.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas exploitation, and in particular to a U-shaped geothermal well temperature monitoring device and method. Background Art

[0002] Fiber optic temperature measurement technology is widely used in temperature measurement and monitoring technology in various fields. In the oil industry, fiber optic temperature measurement technology can provide real-time temperature detection data for the entire well section, which is helpful for determining the temperature of the oil and gas layer, the location of liquid and gas production, and detecting pipe leakage. Since the optical fiber itself has the characteristics of electrical insulation, corrosion resistance, and anti-electromagnetic interference, it is more suitable for use in the oil and gas production process. In the prior art, the commonly used fiber optic temperature measurement method is cumbersome to operate, has poor stability, and low accuracy. The fiber optic temperature measurement device used has a complex structure, a short service life, poor resistance to extreme environments, and an unstable signal source. Therefore, in view of the above shortcomings, a U-shaped geothermal well temperature monitoring device and method are proposed. Summary of the invention

[0003] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a U-shaped geothermal well temperature monitoring device and method to solve the problems that the commonly used optical fiber temperature measurement method is cumbersome to operate, has poor stability, and has low accuracy, and the optical fiber temperature measurement device used therein has a complex structure, a short service life, poor resistance to extreme environments, and an unstable signal source.

[0004] (II) Technical solution In order to solve the above problems, the present invention provides a U-shaped geothermal well temperature monitoring device, comprising: a sensor probe and a transmission device; The sensor probe comprises a sheath, a vacuum tube and a mounting frame. The sheath has a U-shaped cross section. A thermocouple is arranged at the bottom end of the sheath. A vacuum tube is arranged close to the inner wall of the sheath. The vacuum tube is provided with a mounting frame. The mounting frame is divided into three layers from top to bottom. A laser receiver is arranged at the upper layer, a convex lens is arranged at the middle layer, and a laser generator is arranged at the lower layer. The laser receiver, the convex lens, the laser generator and the thermocouple are arranged vertically and concentrically. A connection contact is arranged at the bottom of the mounting frame. The upper end of the connection contact is connected to the laser generator, and the lower end is connected to the thermocouple. The top of the sensor probe is connected to a transmission device to transmit and integrate the detected signals, and the transmission device is connected to a laser receiver.

[0005] Preferably, the transmission device comprises an optical fiber, one end of which is connected to the laser receiver (8) and the other end of which is connected to a central processing unit.

[0006] Preferably, a display screen is provided on the central processing unit.

[0007] Preferably, the central processing unit and the display screen are respectively connected to a power source.

[0008] Preferably, the standard material of the thermocouple is platinum-platinum-rhodium thermocouple.

[0009] A monitoring method for a U-shaped geothermal well temperature monitoring device comprises the following steps: Step 1: calibrate the performance of the thermocouple used in the device to obtain the mV-T relationship of the thermocouple material; Step 2: After assembling the device, install it at the designated location and set the sensor probe in the temperature zone to be measured; Step 3: Perform measurement, convert the heat received by the thermocouple into an optical signal through a laser generator, a convex lens and a laser receiver and transmit it to the transmission device; Step 4: The transmission device integrates and outputs the received optical signal, and compares it with the mV-T relationship diagram obtained in step 1 to obtain the measured temperature.

[0010] Preferably, in step one, the calibration method of the thermocouple is to place the hot ends of the thermocouple and the standard thermocouple at the same temperature, perform measurements at different temperature points, read the mV number at the same time, find the temperature corresponding to each mV number on the standard thermocouple graduation table, correspond the found temperature to the mV reading of the calibrated thermocouple one by one, and obtain the mV-T working curve of the calibrated thermocouple after summarizing.

[0011] (III) Beneficial effects The U-shaped geothermal well temperature monitoring device and method provided by the present invention improve the measurement accuracy of the device by providing a thermocouple on the sensor probe instead of the traditional sensing equipment, and convert the thermal signal of the thermocouple into a laser signal by providing a laser transmitter, a convex lens and a laser receiver, and then transmit it to the optical fiber. The working process is simple, the operation is convenient, and the stability is good. The device can still work normally under extreme environments. Since the thermocouple component is more sensitive to temperature, the detection device and method are more accurate for the real-time temperature measurement data of the measuring point. The optical signal is formed by the laser transmitter and the convex lens and enters the optical fiber for transmission. The signal is stable and has a long service life. In the actual working process, the detection method has simple operation steps, is not easily affected by the external environment, has good stability and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a U-shaped geothermal well temperature monitoring device of the present invention.

[0013] Among them, 1. sensor probe; 2. sheath; 3. vacuum tube; 4. mounting frame; 5. laser generator; 6. connecting contacts; 7. convex lens; 8. laser receiver; 9. thermocouple. Implementation

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by “upper”, “lower”, “inside”, “outside”, “top”, “bottom”, etc. are all based on the orientations or positional relationships shown in the accompanying drawings. The purpose is only to facilitate the description of the present invention and simplify the description. It does not indicate or imply that the referred parts must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. Embodiment 1:

[0016] Figure 1 As shown, the present invention provides a U-shaped geothermal well temperature monitoring device, which specifically includes: a sensor probe 1 and a transmission device. The tail of the sensor probe 1 is connected to the transmission device. In actual application, the head of the sensor probe 1 needs to be installed on the temperature point to be measured. After the sensor probe 1 senses the thermal signal of the temperature point to be measured, the sensed thermal signal is converted into an optical signal and then transmitted to the transmission device.

[0017] After receiving the optical signal from the sensor probe 1 , the transmission device collects and converts the signal into an electrical signal and further processes the signal to display the temperature of the temperature point to be measured measured by the sensor probe 1 in digital form.

[0018] In the present invention, the sensor probe 1 includes a sheath 2, a vacuum tube 3 and a mounting frame 4. The main function of the sheath 2 is to carry and protect internal components to prevent damage to the internal components during installation and use, resulting in inaccurate measurement results. The cross-section of the sheath 2 is U-shaped, which can ensure that only the bottom part can contact the temperature point to be measured during use, preventing the measured temperature from being affected and improving the accuracy of the device.

[0019] A vacuum tube 3 is provided inside the sheath 2. The vacuum tube 3 is arranged close to the inner wall of the sheath 2 to surround the internal space. The vacuum structure inside the vacuum tube 3 can effectively isolate the external temperature and reduce the impact of extreme temperature on the internal device. At the same time, the vacuum tube 3 plays a shock-absorbing role to prevent the normal operation of the internal components from being affected by the vibration of the surrounding environment, thereby improving the stability of the device.

[0020] A mounting frame 4 is provided at the innermost part of the sensing probe 1. The mounting frame 4 is in the space surrounded by the vacuum tube 3 and is used to install and fix the sensing device.

[0021] Among them, a thermocouple 9 is provided at the bottom of the sensing probe 1 to act as a sensor. Compared with the commonly used temperature sensors in the past, the thermocouple 9 is more sensitive to temperature changes. When the temperature of the measuring point changes, due to its own properties, a temperature difference is generated at both ends of the working end of the thermocouple 9, thereby generating a thermoelectric potential and sending out an electrical signal. The electromotive force generated by the different temperatures felt is different, and electrical signals of different strengths are generated. At the same time, due to the simple structure and principle of the thermocouple 9, the electrical signal emitted is more stable and not easily affected by external changes. When the conditions of the external environment change, such as vibration, extreme temperature and other changes, the impact on its working state is small, and it can still work stably.

[0022] like Figure 1 As shown, the mounting frame 4 is divided into three layers from top to bottom, and a laser generator 5 is provided on the lower layer. When the laser generator 5 receives an electrical signal, it converts the received electrical signal into an optical signal and then emits it. The output direction of the laser emitter 5 points directly upwards, and when it receives an electrical signal, it converts the electrical signal into a corresponding optical signal and emits it upwards.

[0023] Among them, a convex lens 7 is provided on the middle layer of the mounting frame 4, and the convex lens 7 is arranged concentrically with the laser generator 5. When the lower laser generator 5 emits a light signal upward, the light signal is emitted to the upper convex lens 7, and the convex lens 7 will deflect the received light signal to change its propagation direction, thereby changing the propagation direction of the light signal and deflecting it toward the top of the convex lens 7.

[0024] A laser receiver 8 is provided on the top layer of the mounting frame 4, and the laser receiver 8 is arranged concentrically with the convex lens 7. When the convex lens 7 below refracts the light, the laser signal is transmitted upward to the laser receiver 8. After the laser receiver 8 collects the received light signal, it continues to transmit the collected light signal upward, so that the light signal is sent to the transmission equipment above. The transmission equipment collects the obtained light signal, converts it into an electrical signal, and then organizes it.

[0025] Among them, a connecting contact 6 is provided below the mounting frame 4, and the connecting contact 6 is connected to the thermocouple 9 below and to the input end of the laser generator 5 above. When the thermocouple 9 generates an electromotive force due to temperature changes and thus generates an electrical signal, the connecting contact 6 transmits the electrical signal generated by the thermocouple 9 below to the input end of the laser emitter 5 above.

[0026] In the present invention, the transmission device includes an optical fiber, one end of which is connected to the tail of the transmission probe 1 and is connected to the laser receiver 8 inside the transmission probe 1. When the laser receiver 8 receives the optical signal, the optical signal is introduced into the optical fiber for transmission. The transmission of the optical signal in the optical fiber has the characteristics of electrical insulation, corrosion resistance, and resistance to electromagnetic interference. The structure of the sensor probe 1 is simple and stable, and the obtained optical signal is more stable than the previous sensor signal, which overcomes the problem of unstable signal source in the prior art.

[0027] Among them, a photoelectric converter is provided at the other end of the optical fiber. When the optical signal propagates in the optical fiber to the photoelectric converter, the optical signal transmitted by the optical fiber is converted back into an electrical signal. The photoelectric converter is connected to the central processing unit. The central processing unit collects and processes the electrical signal converted by the photoelectric converter, and compares it with the mV-T image of the thermocouple 9 used to obtain the data measured by the thermocouple 9.

[0028] It should be noted that the central processing unit is provided with a display, and the electrical signal processed by the central processing unit will eventually be displayed in the form of an image through the display screen provided on the central processing unit. Embodiment 2:

[0029] Based on the above-mentioned U-shaped geothermal well temperature monitoring device, the present invention also provides a detection method of the U-shaped geothermal well temperature monitoring device, comprising the following steps: Step 1: calibrate the performance of the thermocouple used in the device to obtain the mV-T relationship of the thermocouple material; Step 2: After assembling the device, install it at the designated location and set the sensor probe in the temperature zone to be measured; Step 3: Perform measurement, convert the heat received by the thermocouple into an optical signal through a laser generator, a convex lens and a laser receiver and transmit it to the transmission device; Step 4: The transmission device integrates and outputs the received optical signal, and compares it with the mV-T relationship diagram obtained in step 1 to obtain the measured temperature.

[0030] In the step 1, the correction step for the performance of the thermocouple is to place the hot ends of the thermocouple 9 and the standard thermocouple at the same temperature, measure at different temperature points, and read the mV number at the same time. In the mV-T image of the standard thermocouple, find the corresponding temperature T according to the mV number read by the standard thermocouple, and mark the mV-T number read by the thermocouple 9 used at this time in the figure, and finally summarize the mV-T curve of the thermocouple 9 used, which is the working curve of the thermocouple 9 used.

[0031] Wherein, the standard thermocouple is a platinum-platinum thermocouple.

[0032] In step 2, a temperature difference is generated at the working end of the thermocouple 9 when the ambient temperature changes, thereby generating a thermoelectromotive force at both ends of the working end. Under the action of the thermoelectromotive force, an electrical signal is generated in the thermocouple 9.

[0033] The U-shaped geothermal well temperature monitoring device and method provided by the present invention have a simple structure and good stability. The device can still work normally under extreme environments. Compared with the existing technology, it is more sensitive to temperature sensing and the real-time temperature measurement data of the measuring point is more accurate. The operation steps are simple, it is not easily affected by the external environment, has good stability and high precision.

[0034] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A U-shaped geothermal well temperature monitoring device, characterized in that: include: Sensing probe (1) and transmission equipment; The sensing probe (1) comprises a sheath (2), a vacuum tube (3) and a mounting frame (4); the sheath (2) has a U-shaped cross section; a thermocouple (9) is provided at the bottom end of the sheath (2); a vacuum tube (3) is provided close to the inner wall of the sheath (2); and a mounting frame (4) is provided on the vacuum tube (3); the mounting frame (4) is divided into three layers from top to bottom; a laser receiver (8) is provided on the upper layer, a convex lens (7) is provided on the middle layer, and a laser generator (5) is provided on the lower layer; the laser receiver (8), the convex lens (7), the laser generator (5) and the thermocouple (9) are arranged vertically and concentrically; a connecting contact (6) is provided at the bottom of the mounting frame (4); the upper end of the connecting contact (6) is connected to the laser generator (5), and the lower end is connected to the thermocouple (9); The top end of the sensor probe (1) is connected to a transmission device to transmit and integrate the detected signal, and the transmission device is connected to a laser receiver (8).

2. The U-shaped geothermal well temperature monitoring device according to claim 1, characterized in that: The transmission device comprises an optical fiber, one end of which is connected to a laser receiver (8) and the other end of which is connected to a central processing unit.

3. The U-shaped geothermal well temperature monitoring device according to claim 2, characterized in that: The central processing unit is provided with a display screen.

4. The U-shaped geothermal well temperature monitoring device according to claim 3, characterized in that: The central processing unit and the display screen are respectively connected to a power source.

5. The U-shaped geothermal well temperature monitoring device according to claim 1, characterized in that: The standard material of the thermocouple (9) is a platinum-platinum-rhodium thermocouple.

6. The monitoring method of the U-shaped geothermal well temperature monitoring device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: calibrate the performance of the thermocouple used in the device to obtain the mV-T relationship of the thermocouple material; Step 2: After assembling the device, install it at the designated location and set the sensor probe in the temperature zone to be measured; Step 3: Perform measurement, convert the heat received by the thermocouple into an optical signal through a laser generator, a convex lens and a laser receiver and transmit it to the transmission device; Step 4: The transmission device integrates and outputs the received optical signal, and compares it with the mV-T relationship diagram obtained in step 1 to obtain the measured temperature.

7. The method for using the U-shaped geothermal well temperature monitoring device according to claim 6, characterized in that: In the step 1, the calibration method of the thermocouple is to place the hot ends of the thermocouple and the standard thermocouple at the same temperature, measure at different temperature points, read the mV number at the same time, find the temperature corresponding to each mV number on the standard thermocouple graduation table, correspond the found temperature to the mV reading of the calibrated thermocouple one by one, and obtain the mV-T working curve of the calibrated thermocouple after summarizing.

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