CN110485995B - Online coal dust concentration and liquid discharge flow measuring instrument and method for coal bed gas well - Google Patents
Online coal dust concentration and liquid discharge flow measuring instrument and method for coal bed gas well Download PDFInfo
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- CN110485995B CN110485995B CN201910816202.6A CN201910816202A CN110485995B CN 110485995 B CN110485995 B CN 110485995B CN 201910816202 A CN201910816202 A CN 201910816202A CN 110485995 B CN110485995 B CN 110485995B
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- 239000003245 coal Substances 0.000 title claims abstract description 36
- 239000002817 coal dust Substances 0.000 title claims abstract description 27
- 239000007788 liquid Substances 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000013307 optical fiber Substances 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 2
- 238000005259 measurement Methods 0.000 description 19
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses an online coal dust concentration and liquid discharge flow measuring instrument for a coal bed gas well, which comprises a base, wherein the bottom of the base is provided with a water outlet, one side of the base is provided with a water inlet, the water inlet is provided with an electromagnetic valve, the electromagnetic valve comprises a valve and a magnet, the valve is arranged at the water inlet, a coil is wound on the magnet and is arranged at the top of the measuring instrument, and the valve is connected with the magnet through a linkage rod; a mounting rod is arranged between the top and the base, and two different heights of the mounting rod are provided with flow measuring electrodes; a measuring module is arranged between the two electrodes and comprises an infrared emitter, an infrared receiver and a signal processing circuit, wherein the infrared emitter comprises an infrared emission end, an emergent optical fiber light guide reflecting surface and an emergent window, and the infrared receiver comprises an incident window, a light guide receiving reflecting surface, an optical fiber light guide receiving surface and an infrared receiving end; the infrared transmitting end and the infrared receiving end form a pair of infrared geminate transistors which are connected with the signal processing circuit.
Description
Technical Field
The invention relates to the field of coal dust concentration detection, in particular to an on-line coal dust concentration and liquid discharge flow measuring instrument and method for a coal bed gas well.
Background
In the exploitation process of the coal bed gas horizontal well, most of the coal bed gas is stored in a carbon matrix in an adsorption mode, and the storage pressure needs to be reduced to desorb the coal bed gas. And the underground pressure is controlled by discharging the coal bed water, so that the gas exploitation is realized. During the drainage and extraction process, coal powder particles can enter a vertical well shaft along with coal bed gas and water. When the coal dust concentration is less than 1%, the production well is safe; the concentration of coal dust is 1% -3%, and the pump blockage danger exists in the production well; the coal powder concentration is higher than 3%, and the danger of the production well card pump is high. The drainage speed of the production well is also an important index in the drainage process, the drainage speed is too slow to reach the expected gas production efficiency, and the drainage speed is too fast to enable the geological coal bed to have the risk of collapse. Therefore, in the drainage process of the coal-bed gas well, the real-time monitoring of the concentration of the coal dust and the monitoring of the drainage speed are very important.
In the monitoring process of coal dust concentration, most of traditional coal dust monitoring means and devices are in a mode of manually taking water periodically to measure the coal dust concentration and a measuring mode of needing to clean coal dust on monitoring equipment periodically, and the method has some measurement inconveniences.
Disclosure of Invention
The invention aims to provide a structure and a measured temperature error compensation method for coal-bed gas well pulverized coal concentration and drainage flow on-line detection equipment, which solve the problems that the existing coal-bed gas well pulverized coal measurement equipment is of a single-point type which is not on line, static flowing stratum water parameters are required to be measured for many times, and the like.
The technical scheme adopted for solving the technical problems is as follows:
the on-line coal dust concentration and liquid discharge flow measuring instrument comprises a base, wherein the bottom of the base is provided with a water outlet, one side of the base is provided with a water inlet, the water inlet is provided with an electromagnetic valve, the electromagnetic valve comprises a valve and a magnet, the valve is arranged at the water inlet, a coil is wound on the magnet and is arranged at the top of the measuring instrument, and the valve is connected with the magnet through a linkage rod;
a mounting rod is arranged between the top and the base, and two different heights of the mounting rod are provided with flow measuring electrodes;
a measuring module is arranged between the two electrodes and comprises an infrared emitter, an infrared receiver and a signal processing circuit, wherein the infrared emitter comprises an infrared emission end, an emergent optical fiber light guide reflecting surface and an emergent window, and the infrared receiver comprises an incident window, a light guide receiving reflecting surface, an optical fiber light guide receiving surface and an infrared receiving end; the infrared transmitting end and the infrared receiving end form a pair of infrared geminate transistors which are connected with the signal processing circuit.
By adopting the technical scheme, the magnet coil protective cover is arranged outside the magnet.
According to the technical scheme, the emergent light guide reflecting surface and the receiving light guide reflecting surface are inclined planes.
According to the technical scheme, a redundant measuring module is further arranged between the two measuring electrodes, and the redundant measuring module has the same structure as the measuring module.
The measuring instrument further comprises a temperature compensation module, wherein the temperature compensation module comprises an operational amplifier circuit, an infrared emission module, an infrared receiving module and a negative feedback loop which form a closed loop; the negative feedback loop is connected with the infrared receiving module and the operational amplifier circuit; one input end of the operational amplifier circuit is connected with a driving signal.
The invention also provides a method for measuring the concentration of coal dust and the flow of discharged liquid on line in the coal-bed gas well, which comprises the following steps:
installing the measuring instrument in a water outlet tank;
when the parameters do not need to be measured, the solenoid valve coil is not electrified, the valve is opened, and the water outlet normally discharges water;
when the concentration of pulverized coal and the flow of a water pipe are required to be measured, a solenoid valve coil is electrified, a valve is closed, timing is started when the water level in a water tank reaches a flow measuring electrode at the lower part, and timing is stopped when the water level reaches a flow measuring electrode at the upper part, so that a time difference is obtainedThe drainage flow rate is ∈>=/>Wherein->The volume of the water tank is the volume of the water tank;
the infrared rays emitted by the infrared emission end are transmitted to the light guide path through the linear light guide pathAn angular reflecting surface, which is emitted from the emergent window through the reflecting surface, is emitted from the incident window through the coal-water mixture, and is reflected by the light guide passage to the infrared receiving end;
in the process, the photoelectric output voltage of the infrared receiving end is caused by the attenuation effect of the pulverized coal in water on infrared lightIs changed according to the output voltage of the infrared receiving terminal>And obtaining the concentration of coal dust in water.
The invention has the beneficial effects that: the invention is used for on-line detection equipment of coal-bed gas well coal powder concentration and liquid discharge flow, which is used for opening and closing a water inlet through an electromagnetic valve and adopts an infrared emission receiving end to send and receive signals, and structurally solves the problems that the existing coal-bed gas well coal powder measurement equipment needs to measure static flowing stratum water parameters for a plurality of times for comparison, a concentration measurement head needs to be cleaned manually at regular intervals to prevent the coal powder from being stuck, the existing liquid discharge flow meter is complex in structure, a liquid discharge port is easy to be blocked, and the like.
Furthermore, the invention effectively solves the problems of unstable measurement value of the same concentration and the like generated by the equipment on site due to temperature change through temperature compensation.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a block diagram of an on-line coal dust concentration and drainage flow meter for a coal-bed gas well according to an embodiment of the invention;
FIG. 2 is a circuit block diagram of a measurement module according to an embodiment of the invention;
FIG. 3 is a graph showing the relative error between measured coal dust concentration and sample concentration in an embodiment of the present invention.
In fig. 1: 1. the magnetic valve magnetic coil protective cover comprises a magnetic valve magnetic coil protective cover body, 2, an armature, 3, a baffle plate, 4, a linkage rod, 5, a measuring electrode, 6, an infrared emission end, 7, a pulverized coal concentration measuring module shell, 8, an emergent optical fiber light guide, 9, a light guide reflecting surface, 10, an emergent window, 11, an incident window, 12, a light guide reflecting surface, 13, a receiving optical fiber light guide, 14, an infrared receiving end, 15, an installation supporting rod, 16, a measuring electrode, 17, a linkage rod and a valve fixing screw, 18, a water inlet, 19, a valve, 20 and a water outlet.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
FIG. 1 is a block diagram of an on-line coal dust concentration and drainage flow meter for a coal bed gas well. The on-line coal dust concentration and liquid discharge flow measuring instrument for the coal-bed gas well comprises a base, wherein a water outlet 20 is formed in the bottom of the base, a water inlet 18 is formed in one side of the base, an electromagnetic valve is arranged at the water inlet, the electromagnetic valve comprises a valve 19 and a magnet, the valve is arranged at the water inlet, a coil is wound on the magnet and is arranged at the top of the measuring instrument, and the valve is connected with the magnet through a linkage rod 4.
A mounting support rod 15 is arranged between the top and the base, and flow measuring electrodes 5 and 16 are arranged at two different heights of the mounting support rod.
A measuring module is arranged between the two measuring electrodes and comprises an infrared emitter, an infrared receiver and a signal processing circuit, wherein the infrared emitter comprises an infrared emission end 6, an emergent optical fiber light guide 8, an emergent optical fiber light guide reflecting surface and an emergent window 10, and the infrared receiver comprises an incident window 11, a receiving optical fiber light guide reflecting surface 12, a receiving optical fiber light guide 13 and an infrared receiving end 14; the infrared transmitting end 6 and the infrared receiving end 14 form a pair of infrared geminate transistors which are connected with a signal processing circuit. And a redundant measurement module is arranged between the two measurement electrodes, and the structure of the redundant measurement module is the same as that of the measurement module. When one of the measurement modules fails, the other measurement module can be replaced in time.
Further, the magnet is externally provided with a solenoid valve magnet coil protective cover 1 which plays a role in appearance and protection of the magnet coil, and a main circuit control part is arranged in the protective cover and can be connected with the instrument main body through screws. An armature 2 and a baffle 3 are arranged between the magnet and the mounting support rod, and the armature 2 is an electromagnet transmission part and can move up and down under the action of electromagnetic force to drive a device connected with the electromagnet transmission part to act. The baffle 3 provides a certain limit and protection for the action stroke of the armature, and can be fixed on the mounting support rod 15 by screws. The magnet and the linkage rod 4 of the valve can be fixed in a round hole with the same diameter as the linkage rod at the bottom of the armature 2 by screws. The measuring electrode 5 is a timing signal starting point when the instrument measures flow, and is used together with the measuring electrode 16, and the measuring electrode 16 is a timing ending point when the instrument measures flow.
The pulverized coal concentration measuring module housing 7 provides the appearance, installation and protection for the concentration measuring module, which is installed inside. The infrared emitting end 6 and the infrared receiving end 14 form a pair of infrared geminate transistors for emitting and receiving optical signals penetrating through the coal-water mixture. The outgoing optical fiber light guide 8 and the incoming optical fiber light guide 13 are light guide passages made of optical fiber materials and are used for reducing energy loss in the light signal propagation process and improving the sensitivity and stability of the device. The light guide reflecting surfaces 9 and 12 are light signal reflecting surfaces forming an angle alpha with the linear light guide, and function to change the propagation path of the light signal so that all the light signal after being gathered is emitted from the infrared emission window 10, passes through the coal-water mixture, and is emitted from the infrared incidence window 11. The mounting support bar 15 serves to retain the basic structure of the instrument and to provide mounting locations and support for the concentration measurement module. The linkage rod and the valve fixing screw 17 are used for fastening and connecting the linkage rod 4 and the valve 19. The valve 19 is used for switching the water inlet and the water outlet, and is closed when the valve core moves upwards and opened when the valve core moves downwards. The water inlet 19 is connected with a water outlet at the bottom of the water tank, and the water outlet 20 discharges water in the water tank.
The structure is arranged in the water outlet tank, and the flow measurement method is that when the measurement parameters are not needed, the solenoid valve coil is not electrified, the valve is opened, and the water outlet normally discharges water. When the concentration of coal powder and the flow of a water pipe are required to be measured, a solenoid valve coil is electrified, a valve is closed, when the water level in a water tank reaches a flow electrode at the lower part, calculation is started, and when the water level reaches a measuring electrode at the upper part, timing is stopped, so that a time difference is obtainedThe drainage flow rate is ∈>=/>Wherein->Is the volume of the water tank. The method for measuring the concentration of the pulverized coal comprises the following steps that infrared rays emitted by an infrared emission end pass through a straight lineThe line fiber optic light guide is routed to +_ with the light guide>The angle reflecting surface is emitted from the emergent window through the reflecting surface, is emitted from the incident window through the coal water mixture, and is reflected to the infrared receiving end through the light guide passage. In the process, the attenuation effect of the pulverized coal in water on infrared light enables the photoelectric output voltage of an infrared receiving end to be +.>Is varied according to the output voltage ∈>The concentration of coal dust in water can be obtained.
The infrared measuring circuit is sensitive to temperature, so that a corresponding temperature compensation method is also designed in a measuring module of the measuring instrument.
The circuit block diagram of the measuring module is shown in fig. 2, and comprises a driving signal module, an integrated operational amplifier module, a frequency-matched infrared transmitting and receiving module, a feedback circuit, a frequency-matched measuring infrared pair tube DS2 and a signal processing circuit. The measurement module is mainly placed in the pulverized coal concentration measurement module housing 7 shown in fig. 1. In fig. 2, a closed circuit formed by UC1, a frequency-matched infrared transmitting and receiving module and a feedback circuit forms a temperature feedback loop. The infrared pair tube DS2 is used for measuring the concentration of coal powder in the coal-water mixture. Wherein the transmitting end of the infrared pair tube is the infrared transmitting end 6 in fig. 1, and the receiving end is the infrared receiving end 14 in fig. 1.
The driving module in the system provides driving signals required by the systemThe integrated operational amplifier module UC1 is mainly used for amplifying system input signals and providing basic operation for temperature compensation signals, and an output signal of the integrated operational amplifier module UC1 is +.>Acting on the infrared emission module. The infrared transmitting module and the infrared receiving module are coupled through infrared. When the output optical signal of the infrared emission module is stronger, the output electric signal of the infrared output module is +.>The larger the output is, the more the opposite is>The weaker. The infrared emission module is connected in series with the input end of the infrared measurement pair tube DS2, and the output signal thereof is +.>The optical signal intensity between the transmitting end and the receiving end of the infrared pair tube DS2 is determined and measured. When->The larger the measured infrared pair tube DS2, the larger the optical signal intensity between the transmitting end and the receiving end, and the larger the optical signal intensity between 10 and 11 in the structure shown in FIG. 1. DS2 output signal +.>The larger the DS2 output signal +.>The weaker.
The infrared pair tube DS2 is sensitive to the ambient temperature, and in the same input electric signal and the same concentration coal-water mixture, the ambient temperature changes and the output signal thereofCorresponding changes may also occur, making the measurement system unstable. In the measuring module of FIG. 2, when the ambient temperature increases such that the infrared outputs +.>When increasing, the infrared emission module and the infrared pair tube DS2 have the same temperature property, the input is +.>Under the condition of no change, the intensity of the optical signal between the infrared transmitting module and the infrared receiving module is also enhanced, so that the output of the infrared transmitting module is +.>Also gets bigger, after being processed by the negative feedback circuit, outputs an electric signal +.>And enters the reverse input end of the operational amplifier circuit. Due to its signal at the same direction input>Unchanged, by the operational amplifier circuit formula->Wherein->It is known that its net input +.>Decrease, thereby outputting->Also reduces, because of the serial connection between the infrared emission module and the infrared pair tube DS2, the method is +.>Decrease, thereby->Reduce (I)>The reduction makes the optical signal intensity between the infrared emission module and the infrared receiving module also weakened, so that the system can be kept stable under the environmental temperature change.
Compared with other types of measuring instruments, the special appearance structure of the coal-bed gas well pulverized coal concentration and flow detector can realize long-term installation of equipment without cleaning a measuring head, and the feedback type temperature compensation method can ensure that the equipment can measure accurate concentration data and drainage flow data in real time for a terminal to use.
As shown in fig. 3, a graph of measured coal dust concentration versus sample concentration measurement data is shown. The measured data of the graph show that the measured coal dust concentration relative error is relatively stable, the maximum relative error is 0.2556%, and the measured coal dust concentration relative error is within the engineering allowable range.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (6)
1. The on-line coal dust concentration and liquid discharge flow measuring instrument for the coal bed gas well is characterized by comprising a base, wherein the bottom of the base is provided with a water outlet, one side of the base is provided with a water inlet, the water inlet is provided with an electromagnetic valve, the electromagnetic valve comprises a valve and a magnet, the valve is arranged at the water inlet, a coil is wound on the magnet and is arranged at the top of the measuring instrument, and the valve is connected with the magnet through a linkage rod;
a mounting rod is arranged between the top and the base, and two different heights of the mounting rod are provided with flow measuring electrodes;
a measuring module is arranged between the two electrodes and comprises an infrared emitter, an infrared receiver and a signal processing circuit, wherein the infrared emitter comprises an infrared emission end, an emergent optical fiber light guide reflecting surface and an emergent window, and the infrared receiver comprises an incident window, a light guide receiving reflecting surface, an optical fiber light guide receiving surface and an infrared receiving end; the infrared transmitting end and the infrared receiving end form a pair of infrared geminate transistors which are connected with the signal processing circuit;
the emergent light guide reflecting surface and the receiving light guide reflecting surface are light signal reflecting surfaces forming an angle alpha with the linear light guide and are used for changing the light signal propagation paths so that all the collected light signals are emitted from the infrared emission window, pass through the coal-water mixture and are emitted from the infrared incidence window;
the infrared pair tube is used for measuring the concentration of coal powder in the coal-water mixture;
the output signal of the infrared transmitter determines and measures the optical signal intensity between the transmitting end and the receiving end of the infrared pair tube.
2. The on-line coal-bed methane well pulverized coal concentration and liquid discharge flow meter according to claim 1, wherein a magnet coil protective cover is arranged outside the magnet.
3. The on-line coal-dust concentration and liquid discharge flow measuring instrument for coal-bed gas wells according to claim 1, wherein the emergent light guide reflecting surface and the receiving light guide reflecting surface are inclined surfaces.
4. The on-line coal-bed gas well pulverized coal concentration and liquid discharge flow measuring instrument according to claim 1, wherein a redundant measuring module is further arranged between the two measuring electrodes, and the redundant measuring module has the same structure as the measuring module.
5. The on-line coal-bed gas well pulverized coal concentration and liquid discharge flow measuring instrument according to claim 1, further comprising a temperature compensation module, wherein the temperature compensation module comprises an operational amplifier circuit, an infrared emission module, an infrared receiving module and a negative feedback loop which form a closed loop; the negative feedback loop is connected with the infrared receiving module and the operational amplifier circuit; one input end of the operational amplifier circuit is connected with a driving signal.
6. The method for measuring the concentration of coal dust and the flow of discharged liquid in the coal-bed gas well on line is characterized by comprising the following steps:
installing the measuring instrument according to any one of claims 1-5 in a water outlet tank;
when the parameters do not need to be measured, the solenoid valve coil is not electrified, the valve is opened, and the water outlet normally discharges water;
when the concentration of pulverized coal and the flow of a water pipe are required to be measured, a solenoid valve coil is electrified, a valve is closed, timing is started when the water level in a water tank reaches a flow measuring electrode at the lower part, and timing is stopped when the water level reaches a flow measuring electrode at the upper part, so that a time difference is obtainedThe drainage flow rate is ∈>=/>Wherein->The volume of the water tank is the volume of the water tank;
the infrared rays emitted by the infrared emission end are transmitted to the light guide path through the linear light guide pathAn angular reflecting surface, which is emitted from the emergent window through the reflecting surface, is emitted from the incident window through the coal-water mixture, and is reflected by the light guide passage to the infrared receiving end;
in the process, the photoelectric output voltage of the infrared receiving end is caused by the attenuation effect of the pulverized coal in water on infrared lightIs changed according to the output voltage of the infrared receiving terminal>And obtaining the concentration of coal dust in water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910816202.6A CN110485995B (en) | 2019-08-30 | 2019-08-30 | Online coal dust concentration and liquid discharge flow measuring instrument and method for coal bed gas well |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910816202.6A CN110485995B (en) | 2019-08-30 | 2019-08-30 | Online coal dust concentration and liquid discharge flow measuring instrument and method for coal bed gas well |
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| CN110485995A CN110485995A (en) | 2019-11-22 |
| CN110485995B true CN110485995B (en) | 2023-11-17 |
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| CN110485995A (en) | 2019-11-22 |
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