CN103643939A - Coalbed methane liquid level optical fiber testing device - Google Patents
Coalbed methane liquid level optical fiber testing device Download PDFInfo
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- CN103643939A CN103643939A CN201310589452.3A CN201310589452A CN103643939A CN 103643939 A CN103643939 A CN 103643939A CN 201310589452 A CN201310589452 A CN 201310589452A CN 103643939 A CN103643939 A CN 103643939A
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Abstract
The invention discloses a coalbed methane liquid level optical fiber testing device which comprises an optical fiber front end detection head, an optical fiber, a laser signal generation and data processing part and a data displaying part, wherein a transparent film is packaged on one end face of one end of the optical fiber front end detection head, provided with a filter screen and used for being placed in a coalbed methane downhole and preventing the optical fiber front end detection head from being polluted and damaged; the optical fiber is connected with the other end of the optical fiber front end detection head and used for laser transmission; the laser signal generation and data processing part is used for generating laser which is transmitted to the end of the optical fiber front end detection head through the optical fiber, the laser is reflected by the end of the optical fiber front end detection head and then is sent back through the optical fiber, and returned wave laser is processed to obtain digital signals of laser intensity changes; the data displaying part receives information processed by the laser signal generation and data processing part and displays the processed information. Not only is the coalbed methane liquid level optical fiber testing device convenient to test, but also the position of coalbed methane liquid level can be accurately judged.
Description
Technical field
The present invention relates to a kind of coal bed gas liquid level optical fiber testing arrangement.
Background technology
Coal bed gas is the unconventional gas resource that a kind of reserves enrich high-efficiency cleaning, is the supplementary fresh combatants of the rear petroleum times energy.In coal bed gas well mining manufacturing process, need liquid level to monitor test, to reach the object of monitoring coal bed gas well bottom pressure.At present, method of testing mainly comprises echometer method and manometer method.
The shortcoming of echometer method is: when down-hole liquid level is dark or casing pressure is zero, the restriction that echo method is subject to instrument performance will be difficult to the accurate degree of depth of liquid level under gage well, and running string actual grade calculates depth of setting and has certain error with measuring by ground.In addition, pumpingh well particularly coal bed gas well easily produces foam section when normal production, has increased liquid level error of calculation.In order to eliminate foam section to calculating the impact of liquid level, usually need to before surveying liquid level, take measures to eliminate foam section.
The shortcoming of manometer method is: when pressure test, occur adding phenomenon day seriously of card, extension, difficult downforce meter; Pressure gauge test limitation is larger, can only be for the annular test of decentralized wellhead; Owing to being difficult to pre-estimate out the definite position of liquid level, so in order to guarantee that pressure gauge has at least be parked in below liquid level at 3, every well at least needs to stop 5 points, causes construction period longer; During pressure gauge on-the-spot test, need to there be special car on duty and the stay-at-home well site of personnel to see well, have wasted a large amount of manpower and materials.
Summary of the invention
The object of the present invention is to provide a kind of coal bed gas liquid level optical fiber testing arrangement, it is convenient not only to measure, but also can accurately judge the position of coal bed gas liquid level.
A kind of coal bed gas liquid level optical fiber testing arrangement of the present invention comprises:
Optical fiber front end detecting head, the end face of one end is packaged with hyaline membrane and is provided with screen pack, for transferring to, does not have under layer gas well and prevents that optical fiber front end detecting head from being polluted and damaging;
Optical fiber, joins with the other end of described optical fiber front end detecting head, for Laser Transmission;
Laser signal occurs and data processing division, this laser signal generation and data processing division are for generation of laser, end by described Optical Fiber Transmission to described optical fiber front end detecting head, laser is returned by described optical fiber after the end reflections of described optical fiber front end detecting head, and the ripple laser returning is processed, obtain the data signal that laser intensity changes;
Data display part, receives the information after described laser signal generation and data processing division are processed and shows.
Preferably, described laser signal generation and data processing division comprise:
Laser generator, for generation of described laser;
Laser solution modulator-demodulator, receives the laser of being returned by the end reflections of described optical fiber front end detecting head by after described laser generator transmitting, obtains after treatment the data signal that laser intensity changes;
Data processing module, records the data signal of described laser intensity variation and the position data that described optical fiber is transferred.
The present invention utilizes the difference of the refractive index of the ripple of laser in gas and water to test, when optical fiber front end detecting head is transferred to liquid level position, the now refraction of laser can change, thereby cause the sharp light intensity reflecting to have a variation, then obtain coal bed gas liquid level position by the variation of monitoring laser intensity.This installs not only convenient test, and can judge exactly the position of coal bed gas liquid level.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
The specific embodiment
As shown in Figure 1, the present invention includes: optical fiber front end detecting head 1, laser signal occur and data processing division 2, data display part 3 and optical fiber 4.
Optical fiber front end detecting head 1 one end end face is packaged with hyaline membrane and is provided with screen pack, for transferring to, does not have under layer gas well and prevents that optical fiber front end detecting head 1 from being polluted and damaging; With the liquid level position under detecting shaft.Optical fiber 4 joins with the other end of optical fiber front end detecting head 1, for Laser Transmission.
Laser signal generation and data processing division 2 are for generation of laser, by optical fiber 4, be transferred to the end of optical fiber front end detecting head 1, laser is returned by optical fiber 4 after the end reflections of optical fiber front end detecting head 1, and the ripple laser returning is processed, and obtains the data signal that laser intensity changes.Because the refractive index of laser in empty G&W is different, therefore when optical fiber front end detecting head 1 is transferred to coal bed gas liquid level lower time, the refractive index of laser can produce a variation, thereby the sharp light intensity reflecting will be changed, laser signal occurs and laser occurs data processing division 2 on the one hand, receive on the other hand the laser returning, and judge whether to enter into liquid level upper/lower positions by the variation of testing laser intensity, thereby obtain the positional information of coal bed gas liquid level.
In embodiments of the present invention, laser signal generation and data processing division 2 comprise: laser generator 21, Laser Modulation demodulator 22, data processing module 23.Laser generator 21 is for generation of laser, the laser that laser solution modulator-demodulator 22 is returned by the end reflections of optical fiber front end detecting head 1 after receiving and being launched by laser generator 21, obtain after treatment the data signal that laser intensity changes, the position data that the data signal of data processing module 23 recording laser Strength Changes and optical fiber are transferred.
The present invention utilizes the difference of the refractive index of the ripple of laser in gas and water to test, when optical fiber front end detecting head 1 is transferred to liquid level position, the now refraction of laser can change, thereby cause the sharp light intensity reflecting to have a variation, then change to obtain coal bed gas liquid level position by monitoring this.This installs not only convenient test, and can judge exactly the position of coal bed gas liquid level.
Claims (2)
1. a coal bed gas liquid level optical fiber testing arrangement, is characterized in that, comprising:
Optical fiber front end detecting head, the end face of one end is packaged with hyaline membrane and is provided with screen pack, for transferring to, does not have under layer gas well and prevents that optical fiber front end detecting head from being polluted and damaging;
Optical fiber, joins with the other end of described optical fiber front end detecting head, for Laser Transmission;
Laser signal occurs and data processing division, this laser signal generation and data processing division are for generation of laser, end by described Optical Fiber Transmission to described optical fiber front end detecting head, laser is returned by described optical fiber after the end reflections of described optical fiber front end detecting head, and the ripple laser returning is processed, obtain the data signal that laser intensity changes;
Data display part, receives the information after described laser signal generation and data processing division are processed and shows.
2. device as claimed in claim 1, is characterized in that, described laser signal occurs and data processing division comprises:
Laser generator, for generation of described laser;
Laser solution modulator-demodulator, receives the laser of being returned by the end reflections of described optical fiber front end detecting head by after described laser generator transmitting, obtains after treatment the data signal that laser intensity changes;
Data processing module, records the data signal of described laser intensity variation and the position data that described optical fiber is transferred.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310589452.3A CN103643939A (en) | 2013-11-20 | 2013-11-20 | Coalbed methane liquid level optical fiber testing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310589452.3A CN103643939A (en) | 2013-11-20 | 2013-11-20 | Coalbed methane liquid level optical fiber testing device |
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| Publication Number | Publication Date |
|---|---|
| CN103643939A true CN103643939A (en) | 2014-03-19 |
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| CN201310589452.3A Pending CN103643939A (en) | 2013-11-20 | 2013-11-20 | Coalbed methane liquid level optical fiber testing device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222919A (en) * | 2016-12-12 | 2018-06-29 | 中国石油天然气股份有限公司 | Gas-water interface monitoring method applied to salt hole air reserved storeroom gas injection row's halogen stage |
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| CN201884024U (en) * | 2010-09-28 | 2011-06-29 | 北京品傲光电科技有限公司 | Fiber grating sensor-based system used for monitoring coalbed methane well |
| CN102562034A (en) * | 2012-01-17 | 2012-07-11 | 北京奥飞搏世技术服务有限公司 | System for monitoring liquid level of coal-bed gas well based on optical fiber sensing |
| CN102562036A (en) * | 2012-01-17 | 2012-07-11 | 北京奥飞搏世技术服务有限公司 | Pressure and temperature monitor system of coal gas bed well based on optical fiber sensing |
| CN202483561U (en) * | 2012-01-17 | 2012-10-10 | 北京奥飞搏世技术服务有限公司 | Coal-bed gas well liquid level monitoring system based on optical fiber sensing |
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Patent Citations (5)
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| CN201884024U (en) * | 2010-09-28 | 2011-06-29 | 北京品傲光电科技有限公司 | Fiber grating sensor-based system used for monitoring coalbed methane well |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108222919A (en) * | 2016-12-12 | 2018-06-29 | 中国石油天然气股份有限公司 | Gas-water interface monitoring method applied to salt hole air reserved storeroom gas injection row's halogen stage |
| CN108222919B (en) * | 2016-12-12 | 2021-08-03 | 中国石油天然气股份有限公司 | Gas-water interface monitoring method applied to gas injection and brine discharge stage of salt cavern gas storage |
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Application publication date: 20140319 |
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