CN110656929B - Device and method for monitoring liquid level depth of gas well in real time - Google Patents
Device and method for monitoring liquid level depth of gas well in real time Download PDFInfo
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- CN110656929B CN110656929B CN201810694300.2A CN201810694300A CN110656929B CN 110656929 B CN110656929 B CN 110656929B CN 201810694300 A CN201810694300 A CN 201810694300A CN 110656929 B CN110656929 B CN 110656929B
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Abstract
The invention discloses a device and a method for monitoring the liquid level depth of a gas well in real time, wherein the device comprises the following steps: an upper suspension centralizer and a lower suspension centralizer are respectively arranged at two ends of the suspension beacon shell; the low-frequency pulse generator is used for sending out a low-frequency pulse signal; the infrasonic wave transducer is used for converting the low-frequency pulse signal into an infrasonic wave signal; the wellhead receiver comprises a microphone, and the microphone is used for receiving the infrasonic wave signal and converting the infrasonic wave signal into an analog electric signal; the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal; the suspended beacon shell can be suspended on the liquid surface of a gas well, so that the interference of a foam section on the depth of the liquid surface of the gas well is effectively avoided, a low-frequency pulse signal is converted into an infrasonic signal through an infrasonic transducer, a wellhead receiver receives the infrasonic signal and converts the infrasonic signal into an analog signal, and a processor calculates the depth of the liquid surface of the gas well and can monitor the liquid surface and the temperature of the coal bed gas well, the shale gas well and a conventional gas production well in real time.
Description
Technical Field
The invention belongs to the technical field of coal bed gas development, drainage and mining, and particularly relates to a device and a method for monitoring the liquid level depth of a gas well in real time.
Background
The coal bed methane production is to control the output of the coal bed gas well by draining and reducing pressure, and the liquid level control of the coal bed gas well is the most critical link in the drainage and production process of the coal bed gas well. In order to avoid damage to a coal reservoir (closure of a coal bed hole crack system or coal powder output and the like) caused by sudden change of pressure drop in the process of producing the coal bed gas, the flow pressure at the bottom of a well needs to be strictly controlled, the liquid level is ensured to slowly, continuously and stably descend, the liquid level depth is finely controlled, and therefore the change of the liquid level in the well needs to be monitored in real time.
At present, methods and technologies for measuring the liquid level of a coal bed gas well are numerous, a wellhead is generally adopted for installing a sound wave generator, the sound wave generator is transmitted to the liquid level through an oil sleeve annulus and reflected back to the wellhead for calculating the liquid level depth, the methods and technologies are suitable for measuring the liquid level depth at the initial stage of gas production, but when the gas yield at the middle and later stages of gas production is large, a foam section is formed above the liquid level of the oil sleeve annulus due to the action of bubbles, so that the method and the technology have large errors in measuring the liquid level; the liquid level optical fiber testing device is that optical fiber is gone into from wellhead oil jacket annular space, sinks to and calculates the liquid level degree of depth through transmitting laser to wellhead assembly according to laser diffraction under the liquid level, and this technique is influenced by the foam section etc. and is disturbed greatly, and the operation is more hard, and measurement accuracy is not high. The method and the system for solving the working fluid level of the coal-bed gas well calculate the depth of the fluid level by an indirect means of acquiring parameters such as annular fluid density, pump depth, oil pipe pressure and the like, and the method and the system need to solve a plurality of parameters in advance, so that the calculation error is large. Therefore, the existing methods and technologies for measuring the liquid level depth of the coal bed gas well do not consider the foam section which is generated above the liquid level after the gas is produced from the coal bed, and the accuracy of the liquid level measurement is influenced. Adopt suspension beacon to launch low frequency pulse signal from the empty liquid of oil lantern ring face to the well head, well head received signal can real-time accurate monitoring coal bed gas well liquid level degree of depth and avoid because the foam section disturbs the error that leads to etc. not enough.
Therefore, it is necessary to develop a scheme capable of accurately monitoring the liquid level depth of the gas well to obtain accurate bottom hole flowing pressure data, so as to achieve the purpose of accurately controlling the drainage and gas production speed to realize the fine management of the maximum gas production rate of the coal bed gas well.
Disclosure of Invention
In order to overcome the defects of the existing measurement technology and method, the device and the method for monitoring the liquid level depth and the temperature of the coal-bed gas well in real time are provided, and the interference of complex conditions such as a foam section and the like on the liquid level depth of the gas well can be effectively avoided, so that the calculation precision of the bottom hole flowing pressure is ensured, and the requirements of scientific research and field production refinement management are met.
In order to achieve the above object, according to an aspect of the present invention, there is provided an apparatus for monitoring a liquid level depth of a gas well in real time, the apparatus comprising:
the suspension beacon comprises a suspension beacon shell, wherein an upper suspension centralizer and a lower suspension centralizer are respectively arranged at two ends of the suspension beacon shell;
the low-frequency pulse generator is arranged in the suspension beacon shell and used for sending out a low-frequency pulse signal;
the infrasonic wave transducer is arranged in the suspension beacon shell and used for converting the low-frequency pulse signal into an infrasonic wave signal;
the wellhead receiver comprises a microphone, and the microphone is used for receiving the infrasonic signal and converting the infrasonic signal into an analog electrical signal;
and the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal.
Preferably, the suspension beacon housing is used for suspending on the liquid level of the gas well, and the wellhead receiver is used for being arranged on a wellhead.
Preferably, the suspension beacon further comprises a temperature sensor, wherein the temperature sensor is arranged in the suspension beacon shell.
Preferably, the suspension beacon further comprises a battery, wherein the battery is arranged in the suspension beacon shell and used for providing electric energy for the low-frequency pulse generator and the temperature sensor.
Preferably, the wellhead receiver further comprises a data display window for displaying the gas well liquid level depth.
Preferably, the upper suspension centralizer and/or the lower suspension centralizer are conical, and a fishing buckle is arranged at the top end of the upper suspension centralizer.
Preferably, the frequency range of the low-frequency pulse signal is 10-20 Hz.
Preferably, the wellhead receiver further comprises a digitizer for converting the analog electrical signal to a digital signal.
Preferably, the wellhead receiver further comprises a data store for storing the gas well level depth.
Preferably, the processor calculates the gas well liquid level depth according to the following formula:
H＝(T2-T1)Vs
wherein, T1Time difference, T, of two adjacent low-frequency pulse signals sent by the low-frequency pulse generator2The time difference between two adjacent infrasonic signals received by the microphone is shown, and Vs is the propagation velocity of the infrasonic wave in the air.
According to another aspect of the invention, a method for monitoring the liquid level depth of a gas well in real time is provided, which comprises the following steps:
disposing the wellhead receiver at a wellhead;
suspending the suspension beacon shell on the liquid level of the gas well, and starting the low-frequency pulse generator;
calculating, by the processor, a gas well liquid level depth.
The invention has the following beneficial effects: the suspension beacon shell can suspend on the liquid surface of a gas well through an upper suspension centralizer and a lower suspension centralizer at the upper end and the lower end of the suspension beacon shell, so that the interference of complex conditions such as a foam section and the like on the depth of the liquid surface of the gas well is effectively avoided, a low-frequency pulse generator and an infrasonic wave transducer are arranged in the suspension beacon shell, the low-frequency pulse signal is converted into an infrasonic wave signal through the infrasonic wave transducer, a wellhead receiver receives the infrasonic wave signal, a processor calculates the depth of the liquid surface of the gas well according to the low-frequency pulse signal and the infrasonic wave signal, the calculation precision of bottom hole flowing pressure is guaranteed, the liquid surface and the temperature of the coal bed gas well, the shale gas well and a conventional gas well can be monitored in real time, and accurate data are provided for gas well drainage and exploitation.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings. Wherein like reference numerals generally represent like parts throughout the exemplary embodiments.
Fig. 1 shows a schematic structural diagram of a floating beacon of an apparatus for monitoring the liquid level depth of a gas well in real time in one embodiment of the invention.
Fig. 2 shows a schematic structural diagram of a wellhead receiver of the device for monitoring the liquid level depth of the gas well in real time in one embodiment of the invention.
Fig. 3 shows a flow chart of a method for monitoring the liquid level depth of a gas well in real time in one embodiment of the invention.
Description of reference numerals:
11. a lower suspension centralizer; 12. a temperature sensor; 13. a battery; 14. an infrasonic transducer; 15. a low frequency pulse generator; 16. a floating beacon housing; 17. an upper suspension centralizer; 18. fishing and buckling; 2. a wellhead receiver; 21. a microphone; 22. a digitizer; 23. a data storage; 24. and (6) digitally displaying the window.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a device for monitoring the liquid level depth of a gas well in real time, which comprises:
the suspension beacon comprises a suspension beacon shell, wherein an upper suspension centralizer and a lower suspension centralizer are respectively arranged at two ends of the suspension beacon shell; the low-frequency pulse generator is arranged in the suspension beacon shell and used for sending out a low-frequency pulse signal; the infrasonic wave transducer is arranged in the suspension beacon shell and used for converting the low-frequency pulse signal into an infrasonic wave signal; the wellhead receiver comprises a microphone, and the microphone is used for receiving the infrasonic wave signal and converting the infrasonic wave signal into an analog electric signal; and the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal.
The suspension beacon shell can suspend on the liquid level of a gas well through an upper suspension centralizer and a lower suspension centralizer at the upper end and the lower end of the suspension beacon shell, a low-frequency pulse generator and an infrasonic wave transducer are arranged in the suspension beacon shell, the low-frequency pulse generator transmits a low-frequency pulse signal every second, the infrasonic wave transducer converts the low-frequency pulse signal into infrasonic wave and transmits the infrasonic wave signal to a wellhead receiver from the liquid level of the gas well, the wellhead receiver receives the infrasonic wave signal, and the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal.
The device for monitoring the liquid level depth of the gas well in real time is low in manufacturing cost, convenient to operate and capable of monitoring the liquid level depth in real time. It is characterized in that: (1) different from other methods and technologies for monitoring the liquid level depth from top to bottom, the device monitors the liquid level from bottom to top in real time; (2) the anti-interference performance is strong, the device can effectively avoid the influence of the foam section, and the measurement precision is high; (3) the suspension beacon accessory is cheap and is simple to assemble and replace; (4) compared with the liquid level monitor on the market at present, the liquid level monitor can obtain more reliable liquid level and temperature data and provide more accurate data for coal bed gas exploration, development and drainage.
As a preferred scheme, the suspension beacon shell is used for suspending on the liquid level of the gas well, the interference of complex conditions such as foam sections on the depth of the liquid level of the gas well can be effectively avoided, the wellhead receiver is used for being arranged at a wellhead, infrasonic signals are transmitted to the wellhead receiver from the liquid level of the gas well, and the depth of the liquid level of a conventional gas producing well can be monitored in real time.
As a preferred scheme, the gas well liquid level monitoring device further comprises a temperature sensor, wherein the temperature sensor is arranged in the suspension beacon shell and used for monitoring the liquid level temperature of the gas well in real time.
Preferably, the wireless sensor device further comprises a battery, wherein the battery is arranged in the suspension beacon shell and used for supplying electric energy to the low-frequency pulse generator and the temperature sensor. The low-frequency pulse generator transmits a low-frequency pulse signal once per second, so that energy and electricity are saved, and the battery can be continuously used for 6 years.
Preferably, the wellhead receiver further comprises a data display window, and the data display window is used for displaying the depth of the liquid level of the gas well.
In particular, the data display window can also display the liquid level temperature value measured by the temperature sensor.
As the preferred scheme, go up suspension centralizer and/or lower suspension centralizer and be the toper, prevent that suspension beacon from being blocked by tubing coupling in the oil lantern ring sky, the top of going up suspension centralizer is equipped with the salvage knot, is convenient for salvage when sealing a well or changing the battery.
Specifically, the suspension beacon shell can be dismantled, and the installation and the change of each components and parts of being convenient for.
Preferably, the frequency range of the low-frequency pulse signal is 10-20 Hz.
Preferably, the wellhead receiver further comprises a digitizer for converting the analog electrical signal to a digital signal.
Preferably, the wellhead receiver further comprises a data storage device, and the data storage device is used for storing the gas well liquid level depth.
Preferably, the processor calculates the gas well liquid level depth according to the following formula:
H＝(T2-T1)Vs
wherein, T1Time difference, T, of two adjacent low-frequency pulse signals emitted by the low-frequency pulse generator2The time difference between two adjacent infrasonic signals received by the microphone, Vs is the propagation speed of the infrasonic wave in the air.
Specifically, when the wellhead is packaged, the low-frequency pulse generator and the wellhead receiver are started simultaneously, wherein the low-frequency pulseEvery interval of the impulse generator is fixed time T1Sending a primary signal, converting the signal into an infrasonic signal by an infrasonic transducer, sending the signal to a wellhead, receiving the infrasonic signal by a wellhead receiver, and sending a secondary signal by a processor according to the time difference T between two adjacent infrasonic signals2Minus T1And obtaining the transmission time of the infrasonic wave signal in the air of the oil lantern ring, and multiplying the transmission speed (340m/s) of the infrasonic wave signal in the air to obtain the distance from the liquid level to the wellhead.
In particular, coalbed methane wells typically have a depth of less than 1700 meters. The interval time of the signals sent by the low-frequency pulse generator can be automatically adjusted, the interval time is set according to different gas well depths, and the interval time setting is larger than the transmission time of the infrasonic waves in the air of the oil sleeve ring.
According to another aspect of the invention, a method for monitoring the liquid level depth of a gas well in real time is provided, which comprises the following steps:
the method comprises the following steps: disposing a wellhead receiver at a wellhead;
and installing and debugging the wellhead receiver when the wellhead is packaged, so that the wellhead receiver can normally receive signals.
Step two: suspending the suspension beacon shell on the liquid level of the gas well, and starting a low-frequency pulse generator;
and calculating the liquid level depth of the gas well through a processor.
And before the pumping unit is installed on the coal bed gas underground oil pipe, the suspension beacon is put into the air of the oil sleeve ring and activated, and the suspension beacon starts to work at the moment.
By utilizing the device for monitoring the liquid level depth of the gas well in real time, the liquid level and the temperature of the coal bed gas well, the shale gas well and the conventional gas producing well can be monitored in real time, and accurate data are provided for the drainage and the production of the gas well.
Example 1
Fig. 1 shows a schematic structural diagram of a floating beacon of an apparatus for monitoring the liquid level depth of a gas well in real time in one embodiment of the invention, and fig. 2 shows a schematic structural diagram of a wellhead receiver of the apparatus for monitoring the liquid level depth of a gas well in real time in one embodiment of the invention.
As shown in fig. 1 and 2, an embodiment provides an apparatus for monitoring the liquid level depth of a gas well in real time, including:
the suspension beacon comprises a suspension beacon shell 16, wherein an upper suspension centralizer 17 and a lower suspension centralizer 11 are respectively arranged at two ends of the suspension beacon shell 1; the low-frequency pulse generator 15 is arranged in the suspension beacon shell 16, and is used for sending out a low-frequency pulse signal; an infrasonic wave transducer 14, wherein the infrasonic wave transducer 14 is arranged in the suspension beacon shell 16 and is used for converting a low-frequency pulse signal into an infrasonic wave signal; the wellhead receiver 2, the wellhead receiver 2 includes the microphone 21, the microphone 21 is used for receiving the infrasonic wave signal and converting the infrasonic wave signal into the analog electrical signal; and the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal.
The floating beacon housing 16 is adapted to float above the gas well surface and the wellhead receiver 2 is adapted to be positioned at the wellhead.
The device for monitoring the liquid level depth of the gas well in real time further comprises a temperature sensor 12, and the temperature sensor 12 is arranged in a suspension beacon shell 16. And a battery 13, wherein the battery 13 is arranged in the suspension beacon shell 16 and is used for supplying electric energy for the low-frequency pulse generator 15 and the temperature sensor 12.
The wellhead receiver 2 also includes a data display window 24, the data display window 24 being used to display the gas well fluid level depth. The upper suspension centralizer 17 and/or the lower suspension centralizer 11 are conical, and a fishing buckle 18 is arranged at the top end of the upper suspension centralizer 27.
The frequency range of the low-frequency pulse signal is 10-20 Hz.
The wellhead receiver 2 further comprises a digitizer 22, the digitizer 22 being arranged to convert the analog electrical signal into a digital signal, and the wellhead receiver 2 further comprises a data storage 23, the data storage 23 being arranged to store the gas well level depth.
The size of the suspension beacon shell 16 is 25mm in diameter and 120mm in length, and the suspension beacon shell 16 is made of pressure-resistant, corrosion-resistant and scaling-resistant metal products.
The processor calculates the gas well liquid level depth according to the following formula:
H＝(T2-T1)Vs
wherein, T1Time difference, T, of two adjacent low-frequency pulse signals emitted by the low-frequency pulse generator2The time difference between two adjacent infrasonic signals received by the microphone is shown, and Vs is the propagation velocity of the infrasonic wave in the air.
The suspension beacon shell 16 can suspend on the liquid level of a gas well through the upper suspension centralizer 17 and the lower suspension centralizer 11 at the upper end and the lower end of the suspension beacon shell, the low-frequency pulse generator 15 emits a low-frequency pulse signal once per second, the infrasonic transducer 14 converts the low-frequency pulse signal into infrasonic waves and transmits the infrasonic waves to the wellhead receiver 2 from the liquid level of the gas well, the wellhead receiver 2 receives the infrasonic waves, and the processor calculates the depth of the liquid level of the well.
Compared with the prior device for manually exciting and measuring the liquid level from the wellhead for the well site, the device for monitoring the liquid level depth of the coal-bed gas well in real time is time-saving, labor-saving and convenient to operate, can be butted with an information system of a coal-bed gas drainage and production site, realizes real-time dynamic monitoring on a production area, adjusts the bottom flowing pressure of the gas well, optimizes the gas production rhythm of the gas field and improves the yield of the coal-bed gas single well to the maximum extent.
Example 2
FIG. 3 shows a flow chart of a method of monitoring gas well surface depth in real time in one embodiment of the invention.
As shown in fig. 3, an embodiment provides a method for monitoring the liquid level depth of a gas well in real time, which includes the following steps:
the method comprises the following steps: setting a wellhead receiver 2 at a wellhead;
and installing and debugging the wellhead receiver 2 when the wellhead is packaged, so that the wellhead receiver can normally receive signals.
Step two: and (3) suspending the suspension beacon shell 16 on the liquid level of the gas well, starting the low-frequency pulse generator 15, and calculating the depth of the liquid level of the gas well through the processor.
The floating beacon housing 16 is lowered into the air of the oil jacket and activated before the pumping unit is installed in the oil pipe in the coal bed gas well, and the floating beacon starts to work.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (10)
1. A device for monitoring the liquid level depth of a gas well in real time is characterized by comprising:
the suspension beacon comprises a suspension beacon shell, wherein an upper suspension centralizer and a lower suspension centralizer are respectively arranged at two ends of the suspension beacon shell;
the low-frequency pulse generator is arranged in the suspension beacon shell and used for sending out a low-frequency pulse signal;
the infrasonic wave transducer is arranged in the suspension beacon shell and used for converting the low-frequency pulse signal into an infrasonic wave signal;
the wellhead receiver comprises a microphone, and the microphone is used for receiving the infrasonic signal and converting the infrasonic signal into an analog electrical signal;
and the processor calculates the liquid level depth of the gas well according to the low-frequency pulse signal and the infrasonic wave signal.
2. The device for monitoring the liquid level depth of the gas well in real time as claimed in claim 1, wherein the suspension beacon housing is used for suspending on the liquid level of the gas well, and the wellhead receiver is used for being arranged at a wellhead.
3. The device for monitoring the liquid level depth of a gas well in real time as recited in claim 1, further comprising a temperature sensor disposed within the floating beacon housing.
4. The device for monitoring the liquid level depth of a gas well in real time as recited in claim 3, further comprising a battery disposed in the floating beacon housing for providing electrical power to the low frequency pulse generator and the temperature sensor.
5. The device for monitoring the liquid level depth of the gas well in real time as claimed in claim 1, wherein the wellhead receiver further comprises a data display window for displaying the liquid level depth of the gas well.
6. The device for monitoring the liquid level depth of the gas well in real time as claimed in claim 1, wherein the upper suspension centralizer and/or the lower suspension centralizer are conical, and a fishing buckle is arranged at the top end of the upper suspension centralizer.
7. An apparatus for real-time monitoring of the liquid level in a gas well as in claim 1 wherein the wellhead receiver further comprises a digitizer for converting the analog electrical signal to a digital signal.
8. The apparatus for real-time monitoring of gas well fluid level depth of claim 1 wherein the wellhead receiver further comprises a data storage for storing the gas well fluid level depth.
9. The device for monitoring the liquid level depth of a gas well in real time according to claim 1, wherein the processor calculates the liquid level depth of the gas well according to the following formula:
H＝(T2-T1)Vs
wherein, T1Time difference, T, of two adjacent low-frequency pulse signals emitted by the low-frequency pulse generator2The time difference between two adjacent infrasonic signals received by the microphone is shown, and Vs is the propagation velocity of the infrasonic wave in the air.
10. A method for monitoring the liquid level depth of a gas well in real time by using the device for monitoring the liquid level depth of the gas well in real time according to any one of claims 1 to 9, wherein the method comprises the following steps:
disposing the wellhead receiver at a wellhead;
suspending the suspension beacon shell on the liquid level of the gas well, and starting the low-frequency pulse generator;
and calculating the liquid level depth of the gas well through the processor.
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| CN101813508A (en) * | 2008-03-25 | 2010-08-25 | 郑桂刚 | Floater type inclined tube (wall) water level observation platform |
| CN201635729U (en) * | 2009-12-31 | 2010-11-17 | 西安思坦仪器股份有限公司 | Liquid level tester |
| CN103015980B (en) * | 2012-12-11 | 2016-06-08 | 常州大学 | A kind of infrasonic wave is launched and the producing fluid level instrument received and method thereof |
| CN203716957U (en) * | 2014-01-13 | 2014-07-16 | 陕西艾梅生石油科技有限公司 | Subsonic wave water source well liquid level tester |
| US10200794B2 (en) * | 2014-12-31 | 2019-02-05 | Invensense, Inc. | Ultrasonic operation of a digital microphone |
| CN107299832B (en) * | 2017-06-30 | 2021-04-13 | 西安石油大学 | Method for measuring working fluid level of oil well by using frequency difference type infrasonic wave generator |
| CN207332862U (en) * | 2017-08-10 | 2018-05-08 | 胜利油田华滨机制管件有限责任公司 | Oil well automatic detection device |
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