CN101281255A - Method for detecting down-hole instant changeable electromagnetic ultralong distance - Google Patents
Method for detecting down-hole instant changeable electromagnetic ultralong distance Download PDFInfo
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- CN101281255A CN101281255A CNA2008101105908A CN200810110590A CN101281255A CN 101281255 A CN101281255 A CN 101281255A CN A2008101105908 A CNA2008101105908 A CN A2008101105908A CN 200810110590 A CN200810110590 A CN 200810110590A CN 101281255 A CN101281255 A CN 101281255A
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Abstract
The present invention provides a down-hole instant change electromagnetic ultra long distance detecting method. The invention firstly measures the environmental noise, and then eliminates the measured environmental noise from the final detecting result. The inventive power supply voltage is 36V, the current is 3.5A, and the transmitter frequency is 6.25Hz. The invention adopts a small coil detecting technique, which is convenient for coil arrangement in the down-hole and avoids the electromagnetic absorption and guide of the cable, pipeline and the like linearity good conductor in the lane, thereby largely improving the detecting effect. The present invention has advantages of large measurement distance which can reach 360 meters, water sensitivity and good directing property.
Description
Technical field
The present invention relates to a kind of geophysical survey field, more particularly, relate to a kind of down-hole instant changeable electromagnetic ultralong distance electromagnetic surveying method.
Background technology
The transient electromagnetic technology is used for the ground exploration for many years always, and it is to utilize earth-free loop line to underground transmission pulse current, with excitation detection of a target body induction secondary electromagnetic field, during the pulse interval, utilizes the time dependent response of receiving coil observation secondary field.
Because the down-hole belongs to total space exploration, at aspects such as physical model, form of construction work, interpretation procedure essential distinction is arranged with the exploration of ground semispace, its general length of side of ground is hundreds of meters the big coil of square frame, high-power power supply, center type observation technology, can't use in the down-hole at all, thereby limit application and the development of this technology under coal mine greatly.More, the complicated condition of underworkings narrow space, electrical equipment and hardware, disturbing factor are numerous in addition, and at present, the transient electromagnetic detecting distance only can reach about 100m under the coal mine.
There is the abundant in coal resource in China, and for China's high-yield and high-efficiency mine, the range finding of 100m is difficult to satisfy the Coal Production demand.And in recent years, major accidents such as the colliery is permeable take place repeatedly, each tragic experience mine disaster scene, shaking our soul, also remind us again and again, how further to improve the down-hole detection range, find out the geology of deep part structure, ensureing Safety of Coal Mine Production, is pendulum reality and urgent task in face of the hydrogeologist of coalfield.
Research can improve detection range, stablize the down-hole transient electromagnetic detecting technology of Effect on Detecting, no matter to popularization and the development of transient electromagnetic technology under coal mine, still to enrich China's coal-mine down-hole physical prospecting technology, in advance verify gushing water hidden danger, reduce and stop pernicious water leak accident mine safety takes place, ensures, guarantee the sustainable development of coal industry, all be of great immediate significance and theory significance.
Summary of the invention
The object of the invention provides a kind of extra long distance down-hole transient electromagnetic detecting method that can improve detection range, stablize Effect on Detecting.
The system that method of the present invention adopted comprises the receiving system of being made up of receiver and receiving coil, emission coefficient of being made up of transmitter and transmitting coil and the power supply that starts receiving system and emission coefficient.
Method provided by the invention is earlier neighbourhood noise to be measured, and then the survey neighbourhood noise is rejected from final result of detection.At present, the down-hole transient electromagnetic detecting all is directly start emission, receives, and has ignored the interference problem of neighbourhood noise.Under the transmitter-off state, the signal of being surveyed is exactly a noise signal.And the conventional signal that detects has then comprised useful signal and noise signal two parts, because the existence of neighbourhood noise to the formation interference to a certain extent that transmits, influences detection range.The inventor finds, utilizes the receiving system pointwise that neighbourhood noise is measured earlier before the startup emission coefficient, and neighbourhood noise is rejected from the final result who surveys, and the down-hole detection range is largely increased.Wherein, can take methods such as single-point denoising, interval denoising that neighbourhood noise is rejected respectively according to the characteristics of noise.
Down-hole provided by the invention detection method optimal technical scheme comprises the steps:
A. after connecting system power supply, start receiving system earlier, neighbourhood noise is measured;
B. start emission coefficient, make transmitting coil produce a pulse electromagnetic field;
C. by receiver and receiving coil the electromagnetic field signal in the investigative range is received synchronously, then received signal is carried out drawing transient field resistivity isogram after the denoising;
D. judge the distribution range and the position of down-hole low-resistance exceptions area according to transient field resistivity isogram.
The frequency of detection method preferred emission machine provided by the present invention is preferably 6.25Hz.
Transmitting coil is preferably the square frame of length of side 1m.Little and metal, actual conditions that electric equipment is many are launched wire frame by original 2m * 2m with coordinative composition of equipments according to drift section under the coal mine, transform 1m * 1m as.Simultaneously, be aided with cable, pipeline and land, go up measures such as extension, for wire frame is put vacating space.
Extensive application shows that improved 1m * 1m launches wire frame, and down-hole adaptability is strong, can avoid metallic objects such as lane inner cable, pipeline, track, belt preferably to interference such as absorption of electromagnetic wave, guidings, increases substantially detection range and effect.
In surveying early stage, what adopt for 38 times is that 1m * 1m launches wire frame added up for 43 times, and detection range generally can both reach 150～200m, and maximum can reach 360m, has finely satisfied the needs of surveying under the coal mine.
The inventor is according to subsurface environment condition and on-the-spot test situation, carry out multi-parameters optimizations such as transmission frequency, frame spacing, frame position, sampling gate number, select best construction method combination, guarantee the quality of data, bringing into play vital role aspect raising detection range and the effect.
System power supply is made of jointly built-in power and connected external power supply.Built-in power voltage is preferably 12V, and external power supply voltage is preferably 24V, and the electric current of system power supply is preferably 3.5A.
Range finding is big, to water sensitive, directionality is good, Effect on Detecting is stable, is the sharpest edges of present technique.The present invention specifically has following beneficial effect:
(1) the inventive method is carried out denoising to result of detection, has avoided various interference of noise in the detection process; Adopt the low-frequency acquisition technology, strengthen emissive power etc., make detection range bring up to 220m from 100m, maximum has reached 360m, has improved detection range greatly.
(2) adopt the small coil Detection Techniques, it is the square wire frame of 1m that transmitting coil adopts the length of side, its dimension reduction one times, be convenient to coil putting in the down-hole, avoided linear good conductors such as lane inner cable, pipeline to absorption of electromagnetic wave, guiding, detection range and Effect on Detecting are significantly improved.
(3) improved detection efficiency.With the tunnel forward probe is example, tradition electrical method detection range 80m, reserve the 20m barrier pillar, every driving 60m surveys once, each driving needs 3～4 hours, and 16 detections need be carried out in the 1000m tunnel, adopt method of the present invention, only need once to survey, 3～4 hours consuming time, efficient improves nearly 20 times.
(4) the present invention surveys range of control and develops into " face detection " by traditional " line detection ", and range of control increases considerably.
(5) solved directed in the past difficult problem, the effective method of water is visited in down-hole physical prospecting in the past, is exactly DC electrical method, and the method can not be directed.Method of the present invention has thoroughly changed traditional detection method and has visited the non-orientable situation of water, has started directed new era of visiting water of physical prospecting under the coal mine.
So far, carry out the work in 15 mines in big flood mining area, more than 50 production areas such as opening Luan, Huainan, Wan Bei, Xuzhou, Handan Xing, Chengde, maximum measure distance reaches 300～360m.Lean out big moisture unusual 13 places, liberation and be subjected to 4,220,000 tons of the coal resources that water threatens, realize 33,570 ten thousand yuan of economic benefits.
Description of drawings
Fig. 1 is a detection method schematic flow sheet of the present invention.
Embodiment
Below in conjunction with embodiment the present invention is further described: system for use in carrying is the PROTEM47 Transient Electromagnetic Apparatus, detection steps as described in Figure 1:
A. after connecting system power supply, start receiving system earlier, carry out environmental noise measurement;
B. start emission coefficient, power supply makes transmitting coil produce a pulse electromagnetic field to transmitter;
C. by receiver and receiving coil the electromagnetic field signal in the investigative range is received synchronously, carry out to received signal then drawing transient field resistivity isogram after the denoising;
D. judge the distribution range and the position of down-hole low-resistance exceptions area according to transient field resistivity isogram.
Embodiment 1
Before starting transmitter, at first institute's measuring point neighbourhood noise is measured by starting receiving system, and then the startup emission coefficient is surveyed the down-hole, after the down-hole is surveyed and is finished, adopt the indoor special software of TEMINT to reject neighbourhood noise, eliminate the influence of neighbourhood noise, make truer, the increasing of finding range of its result of detection result of detection.Wherein, the method for elimination neighbourhood noise has two kinds usually: single-point denoising and interval denoising.When adjacent measuring point noise variance is big, adopt the pointwise of single-point denoising method with noise removing; When adjacent measuring point noise variance hour, then remove the method for making an uproar between available area, be about to each spot noise and be considered as same numerical value, unifiedly remove adjacent measuring point noise.
Embodiment 2
According to the data that producer's instrument instructions provides, the PROTEM47 Transient Electromagnetic Apparatus is when power frequency 50Hz district work, and use 25,62.5, three kinds of frequencies of 237.5Hz are advised by manufacturer, and 25Hz frequency is then only advised using in the down-hole.But find during work on the spot that some mine (area) undesired signal is bigger to the 25Hz influence, usually can't work.We break through the forbidden zone, have carried out 6.25Hz detection test research work under the coal mine.Detection range is significantly brought up to more than the 150m, and maximum reaches 360m.
In addition, in some mine (area) detection,, data very big as 25Hz frequency noise interference in the detection of apparent 1923 haul lanes, moral Wang ore deposit left side group can't be used, and use 6.25Hz instead and obtain ideal effect.
The inventor in surveying for 43 times altogether, uses 6.25Hz to survey in the problem experimental study stage separately 9 times, two kinds of frequency sondings of 25Hz and 6.25Hz are used simultaneously or are contrasted and use 10 times, two add up to 19 times altogether, account for 45% of total detection times, obtain obvious technique effect.
2006.1.5 during ore deposit, Xing east 2121 transportation lanes left side groups surveyed, under the identical conditions of running parameter such as acquisition environment and supply voltage, frame spacing, the 6.25Hz range finding reached 150m, the 25Hz only 95m that finds range.6.25Hz investigation depth is obviously big than 25Hz.
Embodiment 3
Little and metal, actual conditions that electric equipment is many are launched wire frame by original 2m * 2m with coordinative composition of equipments according to drift section under the coal mine, transform 1m * 1m as.Simultaneously, be aided with cable, pipeline lands and go up measures such as extension, for wire frame is put vacating space.
Extensive application shows that improved 1m * 1m launches wire frame, and down-hole adaptability is strong, can avoid metallic objects such as lane inner cable, metal tubes, track, belt preferably to interference such as absorption of electromagnetic wave, guidings, and detection range and effect increase substantially.
In 43 down-holes being added up early stage were surveyed, what adopt for 38 times was that 1m * 1m launches wire frame, and detection range reaches 150～200m, and maximum reaches 360m, has satisfied well under the coal mine and has surveyed needs.
Embodiment 4
Adopt the PROTEM47 Transient Electromagnetic Apparatus, the built-in 12V power supply of equipment, detection range is less, connects in instrument 12V on the basis of power supply, has increased a 24V external power supply again, and detection range is greatly improved.
Under same tunnel, eastern Pang Kuang-480 Nanjing University lane, same position, equal environmental baseline, adopt in the 12V when surveying and connect power supply in the first phase (2006.1.20) down-hole, its supply current is 1.0A, detection range is 150m; In second and third phase (2006.3.2 and 2006.4.5) down-hole is surveyed, adopt external 24V power supply, electric current increases to 3.5A, and range finding reaches 300～360m.
Embodiment 5
A. after connecting system power supply, start receiving system earlier, institute's measuring point neighbourhood noise is measured by starting receiving system;
B. start emission coefficient, power supply makes transmitting coil produce a pulse electromagnetic field to transmitter; Connect on the basis of power supply in PROTEM47 Transient Electromagnetic Apparatus 12V, increase a 24V external power supply, electric current increases to 3.5A, uses 1m * 1m to launch wire frame;
C. by receiver and receiving coil the electromagnetic field signal in the investigative range is received synchronously, then to drawing transient field resistivity isogram after the indoor special software rejecting of the received signal employing TEMINT neighbourhood noise;
D. judge the distribution range and the position of down-hole low-resistance exceptions area according to transient field resistivity isogram.
So far, utilize the present invention to carry out the work in 15 mines in big flood mining area, more than 50 production areas such as opening Luan, Huainan, Wan Bei, Xuzhou, Handan Xing, Chengde, range finding reaches 300～360m.Lean out big moisture unusual 13 places, liberation and be subjected to 4,220,000 tons of the coal resources that water threatens, realize 33,570 ten thousand yuan of economic benefits.
Above embodiments of the invention, only for the purpose of description, not in order to restriction the present invention.All any modifications of being done within the spirit and principles in the present invention, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of method for detecting down-hole instant changeable electromagnetic ultralong distance, the system that is adopted comprises: the receiving system of being made up of receiver and receiving coil, the emission coefficient of being made up of transmitter and transmitting coil and the power supply that starts receiving system and emission coefficient, it is characterized in that: carry out environmental noise measurement earlier, then neighbourhood noise is rejected from result of detection.
2, detection method according to claim 1 is characterized in that comprising the steps:
(a). after connecting system power supply, start receiving system earlier, carry out environmental noise measurement;
(b). start emission coefficient, power supply makes transmitting coil produce a pulse electromagnetic field to transmitter;
(c). by receiver and receiving coil the electromagnetic field signal in the investigative range is received synchronously, then received signal is carried out drawing transient field resistivity isogram after the denoising;
(d). judge the distribution range and the position of down-hole low-resistance exceptions area according to transient field resistivity isogram.
3, detection method according to claim 1 and 2, the frequency that it is characterized in that described transmitter is 6.25Hz.
4, detection method according to claim 1 and 2 is characterized in that described transmitting coil is the square frame of length of side 1m.
5, detection method according to claim 2 is characterized in that the denoising among the step c comprises single-point denoising and interval denoising.
6, detection method according to claim 1 and 2 is characterized in that described power source voltage is 36V.
7, detection method according to claim 6, the electric current that it is characterized in that described power supply is 3.5A.
8, detection method according to claim 6 is characterized in that described power supply is made of jointly built-in power and connected external power supply, and built-in power voltage is 12V, and external power supply voltage is 24V, and electric current is 3.5A.
9, detection method according to claim 1 and 2 is characterized in that comprising the steps:
(a). after connecting system power supply, start receiving system earlier, carry out environmental noise measurement; Wherein, power source voltage is that 36V, electric current are 3.5A;
(b). start emission coefficient, power supply makes transmitting coil produce a pulse electromagnetic field to transmitter; Wherein, the frequency of transmitter is 6.25Hz; Transmitting coil is the square frame of length of side 1m;
(c). by receiver and receiving coil the electromagnetic field signal in the investigative range is received synchronously, then received signal is carried out drawing transient field resistivity isogram after the denoising; Wherein denoising comprises single-point denoising and interval denoising;
(d). judge the distribution range and the position of down-hole low-resistance exceptions area according to transient field resistivity isogram.
10, detection method according to claim 9 is characterized in that in the step (a), described power supply is made of jointly built-in power and connected external power supply, and built-in power voltage is 12V, and external power supply voltage is 24V; Denoising in the step (c) comprises single-point denoising and interval denoising.
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| CN102213773A (en) * | 2011-04-15 | 2011-10-12 | 河北煤炭科学研究院 | Roadway multi-azimuth advance detection method |
| CN102508311A (en) * | 2011-11-30 | 2012-06-20 | 河北煤炭科学研究院 | Tunnel advanced detection data multi-parameter spatial mapping method |
| CN103091719A (en) * | 2013-01-30 | 2013-05-08 | 武汉地大华睿地学技术有限公司 | Transient electromagnetic underground detecting instrument |
| CN104767093A (en) * | 2015-03-27 | 2015-07-08 | 中国矿业大学 | Mine direct-current sounding data collecting cable and method |
| CN105467458A (en) * | 2009-07-06 | 2016-04-06 | 默林科技股份有限公司 | Measurement Device and Associated Method for Frequency Selection for Inground Transmission |
| CN106646142A (en) * | 2017-03-06 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Grounding grid broken point diagnosis method and transient electromagnetic detection device |
| CN107728220A (en) * | 2017-11-10 | 2018-02-23 | 中国石油化工股份有限公司 | A kind of buried abandoned well artificial magnetization device and detection method |
| CN108776359A (en) * | 2018-07-13 | 2018-11-09 | 中南大学 | The measurement bearing calibration of the small loop line transient electromagnetic system of transceiver |
| CN111880225A (en) * | 2020-09-01 | 2020-11-03 | 贵州朗星智能有限公司 | Cable detector device and method for dynamically filtering environmental interference |
| CN112012725A (en) * | 2019-05-30 | 2020-12-01 | 天津大学青岛海洋技术研究院 | Transient electromagnetic shallow layer full wave exploration high-resolution instrument |
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- 2008-06-04 CN CNA2008101105908A patent/CN101281255A/en active Pending
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| CN105467458B (en) * | 2009-07-06 | 2021-08-17 | 默林科技股份有限公司 | Measuring device for selecting frequencies for subsurface transmission and related method |
| CN105467458A (en) * | 2009-07-06 | 2016-04-06 | 默林科技股份有限公司 | Measurement Device and Associated Method for Frequency Selection for Inground Transmission |
| CN102213773A (en) * | 2011-04-15 | 2011-10-12 | 河北煤炭科学研究院 | Roadway multi-azimuth advance detection method |
| CN102508311A (en) * | 2011-11-30 | 2012-06-20 | 河北煤炭科学研究院 | Tunnel advanced detection data multi-parameter spatial mapping method |
| CN103091719A (en) * | 2013-01-30 | 2013-05-08 | 武汉地大华睿地学技术有限公司 | Transient electromagnetic underground detecting instrument |
| CN104767093A (en) * | 2015-03-27 | 2015-07-08 | 中国矿业大学 | Mine direct-current sounding data collecting cable and method |
| CN106646142A (en) * | 2017-03-06 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Grounding grid broken point diagnosis method and transient electromagnetic detection device |
| CN106646142B (en) * | 2017-03-06 | 2023-06-09 | 云南电网有限责任公司电力科学研究院 | Grounding grid breakpoint diagnosis method and transient electromagnetic detection device |
| CN107728220A (en) * | 2017-11-10 | 2018-02-23 | 中国石油化工股份有限公司 | A kind of buried abandoned well artificial magnetization device and detection method |
| CN107728220B (en) * | 2017-11-10 | 2023-08-15 | 中国石油化工股份有限公司 | Artificial magnetization device and detection method for deep buried abandoned well |
| CN108776359A (en) * | 2018-07-13 | 2018-11-09 | 中南大学 | The measurement bearing calibration of the small loop line transient electromagnetic system of transceiver |
| CN112012725A (en) * | 2019-05-30 | 2020-12-01 | 天津大学青岛海洋技术研究院 | Transient electromagnetic shallow layer full wave exploration high-resolution instrument |
| CN112012725B (en) * | 2019-05-30 | 2024-03-01 | 天津大学青岛海洋技术研究院 | Transient electromagnetic shallow full-wave exploration high-resolution instrument |
| CN111880225A (en) * | 2020-09-01 | 2020-11-03 | 贵州朗星智能有限公司 | Cable detector device and method for dynamically filtering environmental interference |
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