CN107102367B - A kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration device and detection method - Google Patents
A kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration device and detection method Download PDFInfo
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Abstract
The present invention is helicopter prepolarizing field magnetic resonance hydrocarbon exploration device and detection method.Including hanging the pre-polarizing coil and transmitting/receiving coil that are loaded in below helicopter, electric current is passed through in pre-polarizing coil and produces DC electric field, pre-polarizing is carried out to the proton in oil, increase the intensity of magnetization of proton, after the completion of pre-polarizing process, pass through the alternating current to underground tranmitting frequency for local Larmor frequency, the proton in subterranean oil is excited to form macroscopic moment, this macroscopic moment carries out precessional motion in earth's magnetic field, after stopping is excited, proton spin produces relaxation phenomena, NMR signal caused by macroscopic moment precession is sensed by receiving coil, finally reach host computer and carry out data explanation.The present invention improves the intensity of magnetization using prepolarizing field, the purpose of non-intrusion type detection in situ can be achieved, with speed is fast, efficiency high, cost is low, road ability is good, can large area covering advantage, detection time can be saved, and can obtains the high-precision result of detection of high s/n ratio, will be laid the foundation to improve the oil-gas exploration ability in China.
Description
Technical field
The present invention relates to a kind of underground oil and gas resource detection device, especially with helicopter prepolarizing field quick detection underground
The device and detection method of petroleum resources.
Background technology
Oil is a kind of non-renewable energy, the indispensable strategic resource of even more national survival and development, in state
Immeasurable effect is played in terms of family's economy, social development and national defense safety.With the rapid growth of China's economy, urbanization
The continuous improvement of speed and being significantly increased for the size of population, oil are widely used in communications and transportation, industry manufacture, chemical industry spinning
Knit, the field such as agricultural production.Oil exploration method has much at present, but costly, poor anti jamming capability, detection efficient be present
Low, safety and environmental protection realizes the problems such as weak.Nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) technology is in physics, change
Learn and medical domain all once obtains the Nobel Prize, embody powerful application prospect and research and development are worth, recent decades are even more to obtain
Rapidly develop, be widely used in resource detection, chemical analysis, biologic medical etc., food inspection, rock can be realized
The analysis of heart oil content, unconventional energy resource exploitation, porous media aperture and distribution research etc..The seventies in last century, petroleum industry was just opened
Beginning introduces the static state and dynamic of nuclear magnetic resonance technique oil gas in reservoir described in well, and tribute is made that for the exploration and development of oil-gas reservoir
Offer；However, drilling cost is high, efficiency is low, belong to intrusive mood measurement, security and the feature of environmental protection are poor, therefore, it is necessary to explore and send out
Open up non-intrusion type magnetic resonance petroleum resources detection device rapidly and efficiently and detection method.
Patent CN102360703A discloses a kind of " magnet structure of nuclear magnetic resonance logging-while-drilling instrument used in oil well ", the magnetic
The setting coaxial with borehole axis of body structure, it includes permanent magnet magnetic patch and ferromagnetic material magnetic patch, described permanent magnet magnetic patch and ferromagnetic material
Expect magnetic patch along the coaxial connection in borehole axis direction.The inventive structure is simple, and stability is high, and static uniform magnetic field has very caused by it
Deep investigation depth and enough magnetic field intensities, the stratum nuclear-magnetism information of multiple different depths, Neng Gouman can be produced in underground
The needs of sufficient petroleum underground nuclear magnetic resonance detection, suitable for the demand of modern petroleum exploration drilling well.Patent CN103852794A is public
A kind of " hydrocarbon contamination shallow underground water magnetic resonance detection means and detection method " has been opened, has been to connect transmitting respectively by computer to patrol
Collect and control unit, MCU and data acquisition card, 24V batteries are adopted through DCDC modules, transmitting logic and control unit, MCU and signal
Truck is connected with signal conditioning circuit, and energy storage transmitter unit is connected with transmitting logic and control unit, and energy storage transmitter unit is through electricity
Current voltage collecting unit and MCU connect and compose with signal conditioning circuit.Local geomagnetic field intensity is improved with permanent magnet, can be in electricity
Power interference implements Nuclear Magnetic Resonance Measurement than more serious place, effectively improves signal to noise ratio, break because electric power serious interference without
The constraint of nuclear magnetic resonance can be implemented, the result that can effectively overcome Magnetic field inhomogeneity to bring with spin echo pulse is inaccurate to be lacked
Point.Hydrocarbon contamination in 5 meters of underground can rapidly and accurately be detected.Patent CN105549098A discloses a kind of " underground whole-space
Nuclear magnetic resonance pre-polarizing detection device and detection method ", it is adjustable high-power through main control unit and output respectively by computer
Power supply is connected with transmitting bridge driving, high-power transmitting bridge, high toggle switch with pre-polarizing coil, and computer gathers through A/D
Unit, amplifier circuit, Q-switch circuits and connected and composed with humorous electric capacity and receiving coil.Day is much larger than using magnetic field intensity
The prepolarizing field in right earth's magnetic field, the Overall magnetization intensity of detection target water body is improved, so as to obtain bigger nuclear magnetic resonance letter
Number, solve the lower problem for extracting NMR signal of very noisy interference.The direction in pre-polarizing magnetic field can change, and can realize
Directional detection.When being detected using the device to the disaster water body in the underground engineerings such as tunnel, mine, it is possible to achieve to specifying
Direction, specific range region disaster water source water content size, water-bearing layer thickness detection, reduce due to geology such as gushing waters
Various accidents caused by disaster.
The magnet structure of the nuclear magnetic resonance logging-while-drilling instrument used in oil well of foregoing invention is designed using centering gradient magnetic,
The stratum nuclear-magnetism information of multiple different depths can be obtained simultaneously by once going into the well, but investigative range is limited, it is difficult to be realized to subterranean oil
The extensive detection of seepage, according to the mode of many places drilling well, expense can be increased, reduce detection efficient；Hydrocarbon contamination shallow underground
Water magnetic resonance detection means uses permanent magnet to increase magnetic field intensity to detect the hydrocarbons in phreatic water, suitable for small model
The detection of a small amount of objective body is enclosed, it is then helpless to a wide range of detection；Underground whole-space nuclear magnetic resonance pre-polarizing detection device master
The disaster water body in the total space geological environment such as mine, tunnel is detected, is operated in the narrow space of underground, detection range has
Limit, if moving it to ground carries out two-dimensional detection, it is necessary to lay multiple coils, and reasonably select coil configuration, thus
Wiring is complicated, and detection efficient is low, very flexible, and for the operational area that personnel and instrument are difficult to enter, is not suitable for using
Detected in the mode of ground laying coil.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration device,
Strong antijamming capability, suitable for the quick detection of underground oil and gas resource, reach the non-intrusion type detection of high efficiency high-resolution original position
Purpose, detection time can be saved, and can obtains the high-precision result of detection of high s/n ratio, the especially ground to very noisy area
Lower petroleum resources detection is significant.
Another aspect of the present invention provides a kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration method.
The present invention is achieved in that
A kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration device, the device include：
Hang the pre-polarizing coil and transmitting/receiving coil being loaded on helicopter；
The power emission module being connected with pre-polarizing coil and transmitting/receiving coil；
The main control module of the power emission module is controlled, the main control module drives the work(by drive module
Rate transmitter module；
With the host computer of main control module communication connection, running parameter is set in host computer；
The microcontroller connected with main control module communication, by microcontroller via the first electric capacity being connected with battery
After charge power supply and the second capacitor charging power are to the parallel charging of storage capacitor, by storage capacitor with power emission module to pre-
Polarizing coil or transmitting/receiving coil are passed through electric current.
Further, transmitting/receiving coil puts the NMR signal sensed by Signal-regulated kinase and signal
After big module, gathered by signal acquisition module, reach host computer and stored.
Further, the host computer is connected backward main control module transmission instruction with main control module, and passes through reception
Signal acquisition module gathers signal；Main control module is adopted with drive module, microcontroller, transmitting/receiving coil and signal respectively
Collect module connection, information is gathered by main control module control signal acquisition module, by being instructed to microcontroller transmission, control
The discharge and recharge of storage capacitor, transmitting/receiving coil transmitting or the switching received are controlled by main control module.
Further, described device is mounted on helicopter, and the wire frame of pre-polarizing coil and transmitting/receiving coil is overlapping to be put
Put, hang and be loaded in below helicopter, flown by helicopter in predetermined flight path, after reaching sensing point, keep in the air
Stop.
Further, the transmitting/receiving coil is responsible for switching transmitting or reception state by main control module.
A kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration method, this method include：
Pre-polarizing coil and transmitting/receiving coil are carried by helicopter above search coverage；
DC electric field is produced by being passed through electric current in pre-polarizing coil, pre-polarizing is carried out to the proton in oil, increases hydrogen
The intensity of magnetization of core；
After the completion of pre-polarizing process, by the excitation current that underground tranmitting frequency is local Larmor frequency, exciting ground
Proton in lower oil forms macroscopic moment；
After stopping is excited, proton spin produces relaxation phenomena, and sensing macroscopic moment by transmitting/receiving coil enters movable property
Raw NMR signal；
By the NMR signal sensed after Signal-regulated kinase and signal amplification module, by signal acquisition module
Collection, finally reaches host computer and is stored.
Further, concretely comprise the following steps：
A, search coverage is selected according to job requirement, carry prepolarizing field magnetic resonance device using helicopter flies along predetermined
Row track is flown, and is hung below helicopter and is carried pre-polarizing coil and transmitting/receiving coil, pre-polarizing coil and transmitting/receiving coil
The overlapping placement of wire frame, coil plane controls flying height, makes coil in the feelings of non-contiguously table barrier each parallel to ground
Close to earth's surface under condition, make the signal amplitude of collection maximum；
B, sensing point is selected in search coverage, keeps stopping in the air after helicopter flight to sensing point, records the spy
The position of measuring point；
Running parameter is set in host computer, co-ordination is carried out to each module by main control module c,；
D, main control module is charged electric by microprocessor control battery to the first capacitor charging power and the second electric capacity
Source is charged, then by the first capacitor charging power and the parallel charging in parallel realized to storage capacitor of the second capacitor charging power；
E, main control module is controlled by drive module to power emission module, and electricity is passed through into pre-polarizing coil
Stream, DC electric field is produced, pre-polarizing is carried out to the proton in oil, increases the intensity of magnetization of proton；
F, after the completion of pre-polarizing process, alternating current value that main control module is set according to host computer, by drive module control
Power emission module processed is passed through frequency into transmitting coil and is the alternating current of local Larmor frequency, while passes through current acquisition
The actual emission current value of module collection, reaches host computer；
G, after the completion of current emission, receiving coil sensing NMR signal, amplify by Signal-regulated kinase and signal
Gathered after module by signal acquisition module；
H, the signal collected is reached host computer and stored by signal acquisition module；
I, according to the running parameter set during c, d-h processes is repeated several times, obtain multigroup magnetic resonance signal；
J, change emission current value, the alternating current field of different pulse squares is set ascendingly, c-i mistakes are repeated several times
Journey, it is from the superficial to the deep ground-to-ground lower to carry out stratiform scanning, obtain measured signal caused by different depth underground oil and gas；
K, helicopter continues to fly along flight path, flies to after second sensing point and keeps stopping in the air, records the spy
The position of measuring point, j processes are repeated, obtain the measured signal of second sensing point；
L, above-mentioned k processes are repeated, are repeatedly detected, obtained NMR signal will be repeatedly detected and explains,
Obtain underground oil and gas explanation results.
Further, the pre-polarizing electric current is 200~400A, and the pre-polarizing time is 4~8s, and the alternating current is
500mA-30A, launch time 40ms.
Further, the length of side of the pre-polarizing coil is 6~8m, and the number of turn is 12~20 circles, the transmitting/receiving coil number of turn
For 60~80 circles.
Further, two adjacent sensing point spacing are 15~20m.The present invention has the advantage that and beneficial to effect
Fruit：Helicopter prepolarizing field magnetic resonance hydrocarbon exploration device and detection method disclosed by the invention, suitable for underground oil and gas resource
Detection, speed is fast, efficiency high, and the purpose of non-intrusion type detection in situ, safety and environmental protection can be achieved.Organically combine prepolarizing field
Improve the intensity of magnetization, the advantages of Signal-to-Noise can be strengthened.Compared with prior art, using " air-launched-aerial reception "
Mode of operation, have it is easy to operate, cost is low, road ability is good, can large area covering advantage, be that a kind of new oil gas is quick
Detection method.The it is proposed of the present invention, detection time can be saved, and can obtains the high-precision result of detection of high s/n ratio, resists dry
Disturb that ability is strong, solve the limited problem of conventional detection method application, by for improve the oil-gas exploration ability in China establish it is important
Basis, there is good promotion prospect and promotional value, realistic meaning is huge.
Brief description of the drawings
Fig. 1 is helicopter prepolarizing field magnetic resonance detection device work on the spot schematic diagram；
Fig. 2 is helicopter prepolarizing field magnetic resonance detection apparatus structure block diagram；
Fig. 3 is that the FID signal of helicopter prepolarizing field magnetic resonance detection method measures sequential；
1 host computer, 2 prepolarizing field magnetic resonance devices, 3 pre-polarizing coils, 4 transmittings/receiving coil, 5 helicopters, 6 flights
Track, 7 main control modules, 8 drive modules, 9 power emission modules, 10 microcontrollers, 11 first capacitor charging powers, 12 second
Capacitor charging power, 13 batteries, 14 storage capacitors, 15 Signal-regulated kinases, 16 signal amplification modules, 17 signal acquisition moulds
Block, 18 current acquisition modules.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Helicopter prepolarizing field magnetic resonance hydrocarbon exploration method is that a kind of ambient noise that is applied to is complicated, can large area covering
Non-intrusion type detection method in situ, it is significant to the quick detection of underground petroleum resources.
Below in conjunction with the accompanying drawings and embodiment is described further：
As shown in figure 1, pre-polarizing coil 3 and transmitting/receiving coil 4, which are hung, is loaded in the lower section of helicopter 5, transmitting/receiving coil 4
Both the antenna used as transmitting, the coil received again as signal, by the main control module in prepolarizing field magnetic resonance device 2
It is responsible for switching transmitting or the reception state of transmitting/receiving coil 4 by built-in relay, by pre-polarizing coil 3
It is passed through electric current and produces DC electric field, pre-polarizing is carried out to the proton in oil, increase the intensity of magnetization of proton, pre-polarizing process is completed
Afterwards, the proton shape in subterranean oil is excited to the excitation current that underground tranmitting frequency is local Larmor frequency by transmitting coil 4
Into macroscopic moment, this macroscopic moment carries out precessional motion in earth's magnetic field, and after stopping is excited, proton spin produces relaxation and showed
As, by receiving coil 4 sense macroscopic moment precession caused by NMR signal, the measurement sequential of above-mentioned emission process and connect
The collection of letters number is as shown in Figure 3.Finally, the NMR signal sensed reaches host computer 1 and stored.
A kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration method, including following order and step：
A, as shown in figure 1, host computer 1 and prepolarizing field magnetic resonance device 2 are carried in the inside of helicopter 5, the lower section of helicopter 5 is hung
Carry pre-polarizing coil 3 and transmitting/receiving coil 4, the placement overlapping with the wire frame of transmitting/receiving coil 4 of pre-polarizing coil 3, pre- pole
The length of side for changing coil is 6m, and the number of turn is 12 circles, and the number of turn of transmitting/receiving coil is 60 circles, and coil plane is each parallel to ground, directly
Rise machine 5 to fly along flight path 6, control flying height, coil is connect as much as possible in the case of non-contiguously table barrier
Near surface, make the signal amplitude of collection maximum；
B, as shown in Fig. 2 connection detection device, host computer 1 is connected with main control module 7, main control module 7 respectively with drive
Dynamic model block 8, microcontroller 10, transmitting/receiving coil 4 and signal acquisition module 17 connect, drive module 8 and power emission module
9 connection, power emission module 9 respectively with storage capacitor 14, pre-polarizing coil 3, transmitting/receiving coil 4 and current acquisition module
18 connections, current acquisition module 18 are connected with host computer 1, and microcontroller 10 is electric with the first capacitor charging power 11 and second respectively
Capacity charge power supply 12 connects, and the first capacitor charging power 11 and the second capacitor charging power 12 are electric with battery 13 and energy storage respectively
Hold 14 connections, transmitting/receiving coil 4 is connected with Signal-regulated kinase 15, and Signal-regulated kinase 15 connects with signal amplification module 16
Connect, signal amplification module 16 is connected with signal acquisition module 17, and signal acquisition module 17 is connected with host computer 1；
C, search coverage is selected according to job requirement, sensing point is selected in search coverage, sensing point is arrived in the flight of helicopter 5
Keep stopping in the air afterwards, record the position of the sensing point；
D, after opening prepolarizing field magnetic resonance device 2, running parameter is set in host computer 1, it is right by main control module 7
Each module carries out co-ordination；
E, main control module 7 controls battery 13 to the first capacitor charging power 11 and the second electric capacity by microcontroller 10
Charge power supply 12 charges, then is realized by the first capacitor charging power 11 and the second capacitor charging power 12 are in parallel to storage capacitor 14
Parallel charging, further improve charge efficiency；
F, main control module 7 is controlled by drive module 8 to power emission module 9, is passed through into pre-polarizing coil 3
Electric current, DC electric field is produced, pre-polarizing is carried out to the proton in oil, increases the intensity of magnetization of proton, usual pre-polarizing electric current is
200A, pre-polarizing time are 4s；
G, after the completion of pre-polarizing process, transmitting/receiving coil 4 switches to transmitting coil, while master control by main control module 7
The alternating current value that molding block 7 is set according to host computer 1, power emission module 9 is controlled to lead into transmitting coil from drive module 8
Enter the alternating current that frequency is local Larmor frequency, excite in oil proton to produce NMR signal, launch time 40ms,
Actual emission current value is gathered by current acquisition module 18 simultaneously, reaches host computer 1；
H, after the completion of current emission, transmitting/receiving coil 4 switches to receiving coil, receiving coil sense by main control module 7
NMR signal is answered, is gathered after Signal-regulated kinase 15 and signal amplification module 16 by signal acquisition module 17；
I, the signal collected is reached host computer 1 and stored by signal acquisition module 17；
J, according to the running parameter set during d, e-i processes is repeated several times, obtain multigroup magnetic resonance signal；
K, change emission current value, the alternating current field of different pulse squares, the size of excitation current are set ascendingly
Depending on investigation depth, usually 500mA-30A, is repeated several times d-j processes, from the superficial to the deep ground-to-ground lower to carry out stratiform scanning,
Obtain measured signal caused by different depth underground oil and gas；
L, helicopter 5 continues to fly along flight path 6, flies to after second sensing point and keeps stopping in the air, record should
The position of sensing point, two generally adjacent sensing point spacing are 15m, repeat k processes, obtain the actual measurement letter of second sensing point
Number；
M, above-mentioned l processes are repeated, are repeatedly detected, obtained NMR signal will be repeatedly detected and explains,
Obtain underground oil and gas explanation results.
Embodiment 1
Helicopter prepolarizing field magnetic resonance hydrocarbon exploration method is that a kind of ambient noise that is applied to is complicated, can large area covering
Non-intrusion type detection method in situ, pre-polarizing coil 3 and transmitting/receiving coil 4, which are hung, is loaded in the lower section of helicopter 5, transmitting/reception
The both antennas used as transmitting of coil 4, the coil as signal reception again, by the master control in prepolarizing field magnetic resonance device 2
Molding block is responsible for switching, produces DC electric field by being passed through electric current in pre-polarizing coil 3, pre- pole is carried out to the proton in oil
Change, increase the intensity of magnetization of proton, after the completion of pre-polarizing process, launched by the emission current for changing transmitting coil 4 to underground
Frequency is the excitation current of local Larmor frequency, excites the proton in subterranean oil to form macroscopic moment, this macroscopic moment exists
Precessional motion is carried out in earth's magnetic field, after stopping is excited, proton spin produces relaxation phenomena, senses macroscopic view by receiving coil 4
NMR signal caused by magnetic moments precession.Finally, the NMR signal sensed reaches host computer 1 and stored.
Host computer 1 is connected with main control module 7, main control module 7 respectively with drive module 8, microcontroller 10, transmitting/
Receiving coil 4 and signal acquisition module 17 are connected, and drive module 8 is connected with power emission module 9, and power emission module 9 is distinguished
Be connected with storage capacitor 14, pre-polarizing coil 3, transmitting/receiving coil 4 and current acquisition module 18, current acquisition module 18 with
Host computer 1 is connected, and microcontroller 10 is connected with the first capacitor charging power 11 and the second capacitor charging power 12 respectively, the first electricity
The capacitor charging power 12 of capacity charge power supply 11 and second is connected with battery 13 and storage capacitor 14 respectively, transmitting/receiving coil 4
It is connected with Signal-regulated kinase 15, Signal-regulated kinase 15 is connected with signal amplification module 16, signal amplification module 16 and signal
Acquisition module 17 connects, and signal acquisition module 17 connects and composes with host computer 1.
Helicopter prepolarizing field magnetic resonance hydrocarbon exploration method in the present embodiment, including following order and step：
A, host computer 1 and prepolarizing field magnetic resonance device 2 are carried in the inside of helicopter 5, and the lower section of helicopter 5, which is hung, carries pre-polarizing line
Circle 3 and transmitting/receiving coil 4, the placement overlapping with the wire frame of transmitting/receiving coil 4 of pre-polarizing coil 3, the side of pre-polarizing coil
A length of 6m, the number of turn are 12 circles, and the number of turn of transmitting/receiving coil is 60 circles, and coil plane is each parallel to ground, and helicopter 5 is along flying
Row track 6 is flown, and is controlled flying height, coil, close to earth's surface, is made in the case of non-contiguously table barrier
The signal amplitude of collection is maximum；
B, search coverage is selected according to job requirement, sensing point is selected in search coverage, sensing point is arrived in the flight of helicopter 5
Keep stopping in the air afterwards, record the position of the sensing point；
C, after opening prepolarizing field magnetic resonance device 2, running parameter is set in host computer 1, it is right by main control module 7
Each module carries out co-ordination；
D, main control module 7 controls battery 13 to the first capacitor charging power 11 and the second electric capacity by microcontroller 10
Charge power supply 12 charges, then is realized by the first capacitor charging power 11 and the second capacitor charging power 12 are in parallel to storage capacitor 14
Parallel charging, further improve charge efficiency；
E, main control module 7 is controlled by drive module 8 to power emission module 9, is passed through into pre-polarizing coil 3
Electric current, DC electric field being produced, pre-polarizing is carried out to the proton in oil, increases the intensity of magnetization of proton, pre-polarizing electric current is 200A,
The pre-polarizing time is 4s；
F, after the completion of pre-polarizing process, transmitting/receiving coil 4 switches to transmitting coil, while master control by main control module 7
The alternating current value that molding block 7 is set according to host computer 1, power emission module 9 is controlled to lead into transmitting coil from drive module 8
Enter the alternating current that frequency is local Larmor frequency, excite in oil proton to produce NMR signal, launch time 40ms,
Actual emission current value is gathered by current acquisition module 18 simultaneously, reaches host computer 1；
G, after the completion of current emission, transmitting/receiving coil 4 switches to receiving coil, receiving coil sense by main control module 7
NMR signal is answered, is gathered after Signal-regulated kinase 15 and signal amplification module 16 by signal acquisition module 17；
H, the signal collected is reached host computer 1 and stored by signal acquisition module 17；
I, according to the running parameter set during c, d-h processes are repeated 16 times, obtains 16 groups of magnetic resonance signals；
J, change emission current value, the alternating current field of six groups of difference pulse squares is set from 500mA to 30A, repeat c-i mistakes
Journey 6 times, it is from the superficial to the deep ground-to-ground lower to carry out stratiform scanning, obtain measured signal caused by different depth underground oil and gas；
K, helicopter 5 continues to fly along flight path 6, flies to after second sensing point and keeps stopping in the air, record should
The position of sensing point, adjacent two sensing point spacing are 15m, repeat j processes, obtain the measured signal of second sensing point；
L, the above-mentioned k processes of repetition 4 times, 4 times are detected obtained NMR signal and explained, obtain underground oil and gas solution
Release result.
Embodiment 2
Helicopter prepolarizing field magnetic resonance hydrocarbon exploration method is that a kind of ambient noise that is applied to is complicated, can large area covering
Non-intrusion type detection method in situ, pre-polarizing coil 3 and transmitting/receiving coil 4, which are hung, is loaded in the lower section of helicopter 5, transmitting/reception
The both antennas used as transmitting of coil 4, the coil as signal reception again, by the master control in prepolarizing field magnetic resonance device 2
Molding block is responsible for switching, produces DC electric field by being passed through electric current in pre-polarizing coil 3, pre- pole is carried out to the proton in oil
Change, increase the intensity of magnetization of proton, after the completion of pre-polarizing process, by transmitting coil 4 to underground tranmitting frequency be local Rameau
The excitation current of your frequency, the proton in subterranean oil is excited to form macroscopic moment, this macroscopic moment is revolved in earth's magnetic field
Enter motion, after stopping is excited, proton spin produces relaxation phenomena, senses by receiving coil 4 caused by macroscopic moment precession
NMR signal.Finally, the NMR signal sensed reaches host computer 1 and stored.
Host computer 1 is connected with main control module 7, main control module 7 respectively with drive module 8, microcontroller 10, transmitting/
Receiving coil 4 and signal acquisition module 17 are connected, and drive module 8 is connected with power emission module 9, and power emission module 9 is distinguished
Be connected with storage capacitor 14, pre-polarizing coil 3, transmitting/receiving coil 4 and current acquisition module 18, current acquisition module 18 with
Host computer 1 is connected, and microcontroller 10 is connected with the first capacitor charging power 11 and the second capacitor charging power 12 respectively, the first electricity
The capacitor charging power 12 of capacity charge power supply 11 and second is connected with battery 13 and storage capacitor 14 respectively, transmitting/receiving coil 4
It is connected with Signal-regulated kinase 15, Signal-regulated kinase 15 is connected with signal amplification module 16, signal amplification module 16 and signal
Acquisition module 17 connects, and signal acquisition module 17 connects and composes with host computer 1.
Helicopter prepolarizing field magnetic resonance hydrocarbon exploration method in the present embodiment, including following order and step：
A, host computer 1 and prepolarizing field magnetic resonance device 2 are carried in the inside of helicopter 5, and the lower section of helicopter 5, which is hung, carries pre-polarizing line
Circle 3 and transmitting/receiving coil 4, the placement overlapping with the wire frame of transmitting/receiving coil 4 of pre-polarizing coil 3, the side of pre-polarizing coil
A length of 6m, the number of turn are 12 circles, and the number of turn of transmitting/receiving coil is 60 circles, and coil plane is each parallel to ground, and helicopter 5 is along flying
Row track 6 is flown, and is controlled flying height, coil, close to earth's surface, is made in the case of non-contiguously table barrier
The signal amplitude of collection is maximum；
B, search coverage is selected according to job requirement, sensing point is selected in search coverage, sensing point is arrived in the flight of helicopter 5
Keep stopping in the air afterwards, record the position of the sensing point；
C, after opening prepolarizing field magnetic resonance device 2, running parameter is set in host computer 1, it is right by main control module 7
Each module carries out co-ordination；
D, main control module 7 controls battery 13 to the first capacitor charging power 11 and the second electric capacity by microcontroller 10
Charge power supply 12 charges, then is realized by the first capacitor charging power 11 and the second capacitor charging power 12 are in parallel to storage capacitor 14
Parallel charging, further improve charge efficiency；
E, main control module 7 is controlled by drive module 8 to power emission module 9, is passed through into pre-polarizing coil 3
Electric current, DC electric field being produced, pre-polarizing is carried out to the proton in oil, increases the intensity of magnetization of proton, pre-polarizing electric current is 200A,
The pre-polarizing time is 4s；
F, after the completion of pre-polarizing process, transmitting/receiving coil 4 switches to transmitting coil, while master control by main control module 7
The alternating current value that molding block 7 is set according to host computer 1, power emission module 9 is controlled to lead into transmitting coil from drive module 8
Enter the alternating current that frequency is local Larmor frequency, excite in oil proton to produce NMR signal, launch time 40ms,
Actual emission current value is gathered by current acquisition module 18 simultaneously, reaches host computer 1；
G, after the completion of current emission, transmitting/receiving coil 4 switches to receiving coil, receiving coil sense by main control module 7
NMR signal is answered, is gathered after Signal-regulated kinase 15 and signal amplification module 16 by signal acquisition module 17；
H, the signal collected is reached host computer 1 and stored by signal acquisition module 17；
I, according to the running parameter set during c, d-h processes are repeated 16 times, obtains 16 groups of magnetic resonance signals；
J, change emission current value, the alternating current field of eight groups of difference pulse squares is set from 500mA to 30A, repeat c-i mistakes
Journey 8 times, it is from the superficial to the deep ground-to-ground lower to carry out stratiform scanning, obtain measured signal caused by different depth underground oil and gas；
K, helicopter 5 continues to fly along flight path 6, flies to after second sensing point and keeps stopping in the air, record should
The position of sensing point, adjacent two sensing point spacing are 15m, repeat j processes, obtain the measured signal of second sensing point；
L, the above-mentioned k processes of repetition 7 times, 7 times are detected obtained NMR signal and explained, obtain underground oil and gas solution
Release result.Means of interpretation is the conventional processing procedure in this area, and here is omitted.
The underground distribution situation of oil gas is obtained by the inventive method and device, theoretical foundation, phase are provided for oil-gas mining
Than conventional method, the present apparatus enhances the magnetic resonance signal intensity of reception with method, improves Signal-to-Noise, improves detection essence
Degree.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (9)
1. a kind of helicopter prepolarizing field magnetic resonance hydrocarbon exploration device, it is characterised in that the device includes：
Hang the pre-polarizing coil and transmitting/receiving coil being loaded on helicopter；
The power emission module being connected with pre-polarizing coil and transmitting/receiving coil；
The main control module of the power emission module is controlled, the main control module drives the power to send out by drive module
Penetrate module；
With the host computer of main control module communication connection, running parameter is set in host computer；
With the microcontroller of main control module communication connection, charged by microcontroller via the first electric capacity being connected with battery
After power supply and the second capacitor charging power are to the parallel charging of storage capacitor, by storage capacitor and power emission module to pre-polarizing
Coil or transmitting/receiving coil are passed through electric current；
Described device is mounted on helicopter, the overlapping placement of wire frame of pre-polarizing coil and transmitting/receiving coil, is hung to be loaded in and is gone straight up to
Below machine, flown by helicopter in predetermined flight path, after reaching sensing point, keep stopping in the air；
Electric current is passed through in pre-polarizing coil and produces DC electric field, pre-polarizing is carried out to the proton in oil, the magnetization for increasing proton is strong
Degree；
After the completion of pre-polarizing process, transmitting/receiving coil swashs to the excitation current that underground tranmitting frequency is local Larmor frequency
The proton sent out in subterranean oil forms macroscopic moment；
After stopping is excited, proton spin produces relaxation phenomena, is sensed by transmitting/receiving coil caused by macroscopic moment precession
NMR signal.
2. according to the helicopter prepolarizing field magnetic resonance hydrocarbon exploration device described in claim 1, it is characterised in that launch/connect
Take-up circle after Signal-regulated kinase and signal amplification module, is adopted the NMR signal sensed by signal acquisition module
Collection, reaches host computer and is stored.
3. according to the helicopter prepolarizing field magnetic resonance hydrocarbon exploration device described in claim 1, it is characterised in that described upper
Machine is connected backward main control module transmission instruction with main control module, and gathers signal by reception signal acquisition module；Master control
Molding block is connected with drive module, microcontroller, transmitting/receiving coil and signal acquisition module respectively, passes through main control module
Control signal acquisition module gathers information, by being instructed to microcontroller transmission, controls the discharge and recharge of storage capacitor, passes through master control
Molding block control transmitting/receiving coil transmitting or the switching received.
4. according to the helicopter prepolarizing field magnetic resonance hydrocarbon exploration device described in claim 1, it is characterised in that the hair
Penetrate/receiving coil by main control module be responsible for switching transmitting or reception state.
A kind of 5. helicopter prepolarizing field magnetic resonance hydrocarbon exploration method, it is characterised in that this method includes：
Pre-polarizing coil and transmitting/receiving coil are carried by helicopter above search coverage；
DC electric field is produced by being passed through electric current in pre-polarizing coil, pre-polarizing is carried out to the proton in oil, increases proton
The intensity of magnetization；
After the completion of pre-polarizing process, by the excitation current that underground tranmitting frequency is local Larmor frequency, exciting subterranean oil
In proton formed macroscopic moment；
After stopping is excited, proton spin produces relaxation phenomena, is sensed by transmitting/receiving coil caused by macroscopic moment precession
NMR signal；
By the NMR signal sensed after Signal-regulated kinase and signal amplification module, adopted by signal acquisition module
Collection, finally reaches host computer and is stored.
6. in accordance with the method for claim 5, it is characterised in that concretely comprise the following steps：
A, search coverage is selected according to job requirement, prepolarizing field magnetic resonance device is carried along predetermined flight rail using helicopter
Mark is flown, and the line for carrying pre-polarizing coil and transmitting/receiving coil, pre-polarizing coil and transmitting/receiving coil is hung below helicopter
The overlapping placement of frame, coil plane control flying height, make coil in the case of non-contiguously table barrier each parallel to ground
Close to earth's surface, make the signal amplitude of collection maximum；
B, sensing point is selected in search coverage, keeps stopping in the air after helicopter flight to sensing point, records the sensing point
Position；
Running parameter is set in host computer, co-ordination is carried out to each module by main control module c,；
D, main control module is filled by microprocessor control battery to the first capacitor charging power and the second capacitor charging power
Electricity, then by the first capacitor charging power and the parallel charging in parallel realized to storage capacitor of the second capacitor charging power；
E, main control module is controlled by drive module to power emission module, and electric current is passed through into pre-polarizing coil, production
Raw DC electric field, pre-polarizing is carried out to the proton in oil, increases the intensity of magnetization of proton；
F, after the completion of pre-polarizing process, alternating current value that main control module is set according to host computer controls work(by drive module
Rate transmitter module is passed through frequency into transmitting coil and is the alternating current of local Larmor frequency, while passes through current acquisition module
Actual emission current value is gathered, reaches host computer；
G, after the completion of current emission, receiving coil sensing NMR signal, by Signal-regulated kinase and signal amplification module
Gathered afterwards by signal acquisition module；
H, the signal collected is reached host computer and stored by signal acquisition module；
I, according to the running parameter set during c, d-h processes is repeated several times, obtain multigroup magnetic resonance signal；
J, change emission current value, the alternating current field of different pulse squares is set ascendingly, c-i processes are repeated several times, by
It is shallow enter it is deep it is ground-to-ground lower carry out stratiform scanning, obtain measured signal caused by different depth underground oil and gas；
K, helicopter continues to fly along flight path, flies to after second sensing point and keeps stopping in the air, records the sensing point
Position, repeat j processes, obtain the measured signal of second sensing point；
L, above-mentioned k processes are repeated, are repeatedly detected, obtained NMR signal will be repeatedly detected and explains, obtain
Underground oil and gas explanation results.
7. in accordance with the method for claim 6, it is characterised in that the size that electric current is passed through in the pre-polarizing coil is 200
~400A, pre-polarizing time are 4~8s, and the alternating current is 500mA-30A, launch time 40ms.
8. in accordance with the method for claim 5, it is characterised in that the length of side of the pre-polarizing coil is 6~8m, the number of turn 12
~20 circles, transmitting/receiving coil number of turn are 60~80 circles.
9. in accordance with the method for claim 5, it is characterised in that two adjacent sensing point spacing are 15~20m.
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| CN109814161B (en) * | 2019-02-20 | 2020-10-02 | 吉林大学 | Aviation magnetic resonance underground water detection device and method |
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