CN109268002A - A kind of array acoustic irradiation device and method for brill forward sight acoustic logging - Google Patents
A kind of array acoustic irradiation device and method for brill forward sight acoustic logging Download PDFInfo
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- CN109268002A CN109268002A CN201811049828.0A CN201811049828A CN109268002A CN 109268002 A CN109268002 A CN 109268002A CN 201811049828 A CN201811049828 A CN 201811049828A CN 109268002 A CN109268002 A CN 109268002A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 241001074085 Scophthalmus aquosus Species 0.000 title claims description 12
- 230000005855 radiation Effects 0.000 claims abstract description 34
- 238000005086 pumping Methods 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims description 4
- 230000005284 excitation Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 8
- 238000005553 drilling Methods 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 239000012530 fluid Substances 0.000 description 8
- 238000010606 normalization Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- -1 polytetrafluoroethylene Polymers 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000005404 monopole Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000003325 tomography Methods 0.000 description 1
Classifications
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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- Engineering & Computer Science (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention provides a kind of for the array acoustic irradiation device and method for boring forward sight acoustic logging, comprising: is set to array sound radiator, acquiring unit and the exciting unit of drill collar outer surface；Array sound radiator includes: along multiple acoustic irradiation stations of same axis arrangement；Acoustic irradiation station includes: multiple piezoelectric vibrators；Each piezoelectric vibrator is respectively arranged in each groove that drill collar outer surface is along the circumferential direction uniformly arranged；Acquiring unit, for obtaining the control parameter being suitable for forward sight acoustic logging is bored；Control parameter includes: the amplitude weight for the pumping signal that adjacent acoustic wave radiates the delay time for applied pumping signal of standing and each acoustic irradiation station is applied；Exciting unit, for motivating each acoustic irradiation station using control parameter, with radiative acoustic wave energy.The present invention can control acoustic wave energy as much as possible to radiation in front of drill bit, have the beneficial effect for the forward looking detection ability for improving acoustic logging while drilling instrument.
Description
Technical field
The present invention relates to the logging technique fields in geophysics and petroleum works, more particularly to one kind is for brill forward sight
The array acoustic irradiation device and method of acoustic logging.
Background technique
With deepening continuously for domestic and international oil-gas exploration and development, the drillng operation of horizontal well and high angle hole is increasing,
Geosteering is quickly grown.However, the uncertainty of drill bit front geological tectonic information is not during actual well drilled
The brill that only will affect target zone meets effect, can also greatly increase the risk of drillng operation.Therefore, it is necessary to real in drilling process
When understand in front of drill bit that whether there is or not the which sides of geological structure, drill bit geology in the range of tens centimetres to several meters or even more than ten meters
Construction and drill bit are how far apart from geological structure.Geosteering can be passed through on the basis of obtaining and boring preceding geological structure information
Technology is monitored and controls to well track, guarantees that practical wellbore is in the optimum position of Reservoir Development always, so as to
To improve development benefit to the maximum extent.Detection target with brill forward sight acoustic logging is mainly the geological structure in front of drill bit,
And the sound source of existing acoustic logging while drilling instrument without apparent radiation directivity, can not the sound field of opposite well external radiation carry out
Control, only seldom part energy are radiated in stratum in front of drill bit.There are when geological structure in front of the drill bit,
It can be only formed very weak scattering (or reflection) wave signal, seriously affected the detectivity that instrument constructs drill bit front geological.
Therefore, how the sound source of the acoustic logging while drilling instrument with directional radiation capacity is provided, is current urgently to be resolved
The technical issues of.
Summary of the invention
In order to solve defect in the prior art, the present invention provides a kind of for the array for boring forward sight acoustic logging
Acoustic irradiation device and method has the beneficial effect for the forward looking detection ability for improving acoustic logging while drilling instrument.
To achieve the goals above, the present invention provides a kind of for the array acoustic irradiation for boring forward sight acoustic logging
Device, the device include: array sound radiator, acquiring unit and the exciting unit for being set to drill collar outer surface；The battle array
Column sound radiator includes: along multiple acoustic irradiation stations of same axis arrangement；The acoustic irradiation station includes: multiple piezoelectricity
Oscillator；
Each piezoelectric vibrator is respectively arranged in each groove that the drill collar outer surface is along the circumferential direction uniformly arranged；
The acquiring unit is suitable for the control parameter with brill forward sight acoustic logging for obtaining；The control ginseng
Number includes: that the delay time for the pumping signal that the adjacent acoustic irradiation station is applied and each acoustic irradiation station are applied
The amplitude weight of pumping signal；
The exciting unit, for motivating each acoustic irradiation station using the control parameter, with radiative acoustic wave energy.
In one embodiment, the acoustic irradiation station further include: be set between each piezoelectric vibrator and corresponding groove
The first acoustic-electric slider, for acoustic-electric to be isolated.
In one embodiment, the array sound radiator further include: be set between each acoustic irradiation station
Two acoustic-electric sliders, for acoustic-electric to be isolated.
In one embodiment, the operating frequency range of each piezoelectric vibrator is 5kHz to 25kHz.
In one embodiment, each acoustic irradiation station includes at least four piezoelectric vibrators.
In one embodiment, each acoustic irradiation station is along drill collar axis arranged at equal intervals；It is applied at each acoustic irradiation station
The dominant frequency of the pumping signal added is equal；The delay time for the pumping signal that the adjacent acoustic irradiation station is applied is equal.
In one embodiment, the deflection angle theta of radiation Main beam of the array sound radiator in wellsMeet such as ShiShimonoseki
It is formula:
Wherein, d is the distance between the central point at the adjacent acoustic irradiation station, VfFor the longitudinal wave velocity of mud in well, τ
By the delay time for the pumping signal that the adjacent acoustic irradiation station applies.
In one embodiment, the deflection angle theta of radiation Main beam of the array sound radiator in wellsNo more than sound wave
By the first critical angle for being incident in borehole wall interface in well.
In one embodiment, the first critical angle θcSpecifically:
θc=arcsin (Vf/Vp)
Wherein, VfFor the longitudinal wave velocity of mud in well, VpFor the longitudinal wave velocity of near-borehole formation.
The present invention also provides a kind of for the array acoustic irradiation method for boring forward sight acoustic logging, this method packet
It includes:
It obtains and is suitable for the control parameter with brill forward sight acoustic logging；The control parameter includes: the adjacent sound
The amplitude for the pumping signal that the delay time for the pumping signal that wave radiation station is applied and each acoustic irradiation station are applied is weighed
Weight；
Each acoustic irradiation station is motivated using the control parameter, with radiative acoustic wave energy.
It is provided by the invention a kind of for the array acoustic irradiation device and method for boring forward sight acoustic logging, comprising:
It is set to array sound radiator, acquiring unit and the exciting unit of drill collar outer surface；The array sound radiator packet
It includes: along multiple acoustic irradiation stations of same axis arrangement；The acoustic irradiation station includes: multiple piezoelectric vibrators；Each piezoelectricity
Oscillator is respectively arranged in each groove that the drill collar outer surface is along the circumferential direction uniformly arranged；The acquiring unit, for obtaining
It takes and is suitable for the control parameter with brill forward sight acoustic logging；The control parameter includes: the adjacent acoustic irradiation station institute
The amplitude weight for the pumping signal that the delay time of the pumping signal of application and each acoustic irradiation station are applied；The excitation
Unit, for motivating each acoustic irradiation station using the control parameter, with radiative acoustic wave energy.The application is by adjusting institute
Stating the parameters such as the amplitude and phase of pumping signal that each acoustic irradiation station is applied in array sound radiator can control
The vertical directivity for making the array sound radiator makes acoustic wave energy as much as possible to radiation in front of drill bit, to increase
Add the detection range of instrument and improve the signal-to-noise ratio for receiving signal, there is the forward looking detection ability for improving acoustic logging while drilling instrument
Beneficial effect.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural block diagram for the array acoustic irradiation device for boring forward sight acoustic logging of the application；
Fig. 2 is the structural schematic diagram of the array sound radiator in the embodiment of the application；
Fig. 3 is the top view at the acoustic irradiation station in one embodiment of the application；
Fig. 4 is the structural schematic diagram at the acoustic irradiation station in one embodiment of the application；
Fig. 5 is with the schematic illustration for boring forward sight acoustic logging；
Fig. 6 is the schematic diagram of the directed radiation technology of the array sound radiator in one embodiment of the application；
Fig. 7 is a kind of flow chart for the array acoustic irradiation method for boring forward sight acoustic logging of the application；
Fig. 8 is that the different array sound radiator of the radiation station number in one embodiment of the application motivates in a fluid
Normalization shear wave energy distribution map；
Fig. 9 is that the different array sound radiator of the delay time in one embodiment of the application motivates in a fluid
Normalize shear wave energy distribution map；
Figure 10 is that the different array sound radiator of the amplitude weight in one embodiment of the application motivates in a fluid
Normalization shear wave energy distribution map.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
About " first " used herein, " second " ... etc., not especially censure the meaning of order or cis-position,
Also non-to limit the present invention, only for distinguishing with the element of same technique term description or operation.
It is open term, i.e., about "comprising" used herein, " comprising ", " having ", " containing " etc.
Mean including but not limited to.
About it is used herein " and/or ", including any of the things or all combination.
In view of the deficiencies in the prior art, the present invention provides a kind of for the array for boring forward sight acoustic logging
Acoustic irradiation device, structure is as shown in Figure 1, the array acoustic irradiation device includes: array sound radiator 1, obtains
Unit 2 and exciting unit 3.
Array sound radiator 1 is set to 4 outer surface of drill collar, and array sound radiator 1 includes: multiple acoustic irradiations
Stand 101.
As shown in Fig. 2, the array sound radiator 1 includes at least two acoustic irradiation stations 101, and each acoustic irradiation station
101 arrange along 4 axis direction of drill collar.
As shown in figure 3, acoustic irradiation station 101 includes: multiple piezoelectric vibrators 1011.Specifically, of piezoelectric vibrator 1011
Number is at least 4.
As shown in figure 4,4 outer surface of drill collar is along the circumferential direction uniformly arranged several grooves 401, each piezoelectric vibrator 1011 is distinguished
It is set in each groove 401.
Acquiring unit 2, for obtaining the control parameter being suitable for forward sight acoustic logging is bored.Wherein control parameter includes:
The pumping signal that the delay time for the pumping signal that adjacent acoustic wave radiation station 101 is applied and each acoustic irradiation station 101 are applied
Amplitude weight.
Exciting unit 3, for motivating each acoustic irradiation station 101 using control parameter, with radiative acoustic wave energy.
In one embodiment, as shown in figure 3, acoustic irradiation station 101 further include: be set to each piezoelectric vibrator 1011 with it is right
The first acoustic-electric slider 1012 between the groove 401 answered, for acoustic-electric to be isolated.
When it is implemented, the material of the first acoustic-electric slider 1012 is specially polytetrafluoroethylene (PTFE), but the present invention not as
Limit, any material with isolation acoustic-electric function can be with.
In one embodiment, as shown in Figure 1, the array sound radiator 1 further include: be set to each acoustic irradiation station
The rising tone between 101 is electrically isolated body 102, for acoustic-electric to be isolated.
When it is implemented, the material that the rising tone is electrically isolated body 102 is specially polytetrafluoroethylene (PTFE), but the present invention not as
Limit, any material with isolation acoustic-electric function can be with.
In one embodiment, the operating frequency range of each piezoelectric vibrator 1011 is 5kHz to 25kHz.
In one embodiment, the distance between central point at adjacent acoustic wave radiation station 101 (i.e. spacing) is equal, each sound
The dominant frequency for the pumping signal that wave radiation station 101 is applied is equal, and the pumping signal that adjacent acoustic wave radiation station 101 is applied is prolonged
The slow time is equal.
In one embodiment, the deflection angle theta of radiation Main beam of the array sound radiator in wellsMeet such as ShiShimonoseki
It is formula:
Wherein, d is the distance between the central point at adjacent acoustic wave radiation station 101 (i.e. spacing), VfFor in well mud it is vertical
Wave velocity of wave, the delay time for the pumping signal that τ is applied by adjacent acoustic wave radiation station 101.
When it is implemented, Fig. 5 is with the schematic diagram for boring forward sight acoustic logging.As shown in figure 5, wellhole 5, acoustic isolater 6, sound wave
Receiver 7, stratum A, stratum B and bed boundary C.With the principle for boring forward sight acoustic logging are as follows: each acoustic irradiation station 101 is by certain
Delay time successively motivates；There are when the geological structures such as crack, tomography, interface in front of drill bit, sound wave dissipates from geological structure
It penetrates (or reflection) back, is adsorbed by the sound wave receiver；Waveform is received by the processing such as wave field separation, migration imaging and coordinate transform
Afterwards, drill bit can be obtained to information such as architectonic distance, architectonic tendency and orientation.Compared to existing with brill
The advantage of the sound radiator of acoustic logging instrument, the array acoustic irradiation device of the embodiment of the present invention is exactly by adjusting each
The parameters such as the amplitude and phase of pumping signal at a acoustic irradiation station can control the vertical directivity of array sound radiator,
Make acoustic wave energy as much as possible to radiation in front of drill bit, to increase the detection range of instrument and improve the noise for receiving signal
Than having the beneficial effect for the forward looking detection ability for improving acoustic logging while drilling instrument.
According to acoustics theory, as shown in fig. 6, the radiation characteristic of array acoustic irradiation device is by 4 acoustic irradiation stations
The sound wave of 101 (T1, T2, T3 and T4) radiation is in place interference superposition as a result, distribution and application with each acoustic irradiation station 101
Pumping signal on each acoustic irradiation station 101 is related.The deflection angle of radiation Main beam of the array sound radiator in well
θsMeet above-mentioned formula (1), wherein d is the distance between adjacent acoustic irradiation station central point (i.e. spacing), such as T1 with
The distance between central point of T2, VfThe excitation applied for the longitudinal wave velocity of mud in well, τ by adjacent acoustic wave radiation station 101
The delay time of signal, such as time difference of pumping signal that the pumping signal that is applied of T1 and T2 are applied.
Wherein, the deflection angle theta of radiation Main beam of the array sound radiator 1 in wellsNo more than sound wave by entering in well
It penetrates in the first critical angle at borehole wall interface.
In one embodiment, the deflection angle theta of radiation Main beam of the array sound radiator 1 in wellsNo more than sound
Wave by be incident in well well logging wall interface first critical angle.
When it is implemented, the first critical angle θcSpecifically:
θc=arcsin (Vf/Vp)
Wherein, VfFor the longitudinal wave velocity of mud in well, VpFor the longitudinal wave velocity in near-borehole formation.For general stratum, always have
Vf< Vp。
When the sound wave that sound source generates in wellhole 5 is with incidence angle θsWhen being incident in the borehole wall, only meet θs< θcShi Caineng is in well
Refracted longitudinal wave is generated in other stratum.It is generally believed that in well mud longitudinal wave velocity VfAbout 1600m/s, it is vertical in near-borehole formation
Wave velocity of wave VpRange be 1800m/s~7000m/s.Then, the range of the first critical angle on various stratum is about 13 °~63 °.
Array sound radiator 1 in one embodiment of the invention, as shown in Fig. 2, 4 outer surface of drill collar is set to, by four
A acoustic irradiation station 101 is arranged along same axis, uses the first acoustic-electric slider 102 between adjacent acoustic wave radiation station 101
Carry out acoustic-electric isolation.As shown in figure 4, a radiating element of each acoustic irradiation station 101 as array sound radiator 1,
It is made of multiple piezoelectric vibrators 1011.Each piezoelectric vibrator 1011 is respectively arranged at 4 outer surface of drill collar and is along the circumferential direction uniformly arranged
Each groove 401 in.Between 4 outer surface of each piezoelectric vibrator 1011 and drill collar using the rising tone be electrically isolated body 1012 carry out acoustic-electric every
From.When 1011 same-phase of each piezoelectric vibrator in each acoustic irradiation station 101 works, the vibration etc. at each acoustic irradiation station 101
It imitates in a monopole sound source, the operating frequency range of each piezoelectric vibrator 1011 is 5kHz to 25kHz.
The present invention also provides a kind of for being applied to above-mentioned use with the array acoustic irradiation method for boring forward sight acoustic logging
In with bore forward sight acoustic logging array acoustic irradiation device, flow chart as shown in fig. 7, method includes the following steps:
S101: the control parameter being suitable for forward sight acoustic logging is bored is obtained.Wherein, control parameter includes: adjacent acoustic wave
The amplitude weight for the pumping signal that the delay time of the applied pumping signal in radiation station and each acoustic irradiation station are applied.
S102: each acoustic irradiation station is motivated using control parameter, with radiative acoustic wave energy.
Fig. 8 is that the different array sound radiator of the radiation station number in one embodiment of the application motivates in a fluid
Normalization shear wave energy distribution map.Fig. 9 is the different array sound radiator of the delay time in one embodiment of the application
The normalization shear wave energy distribution map motivated in a fluid.Figure 10 is the different battle array of the amplitude weight in one embodiment of the application
The normalization shear wave energy distribution map that column sound radiator motivates in a fluid.The different control parameters of the embodiment of the present invention
The normalization shear wave energy distribution map that is motivated in infinitely great fluid of array sound radiator, such as Fig. 8, Fig. 9 and Figure 10
It is shown.In general, as shown in figure 8, increasing with acoustic irradiation station number, the longitudinal wave that array sound radiator motivates
Energy gradually increases, and the 3dB angular width for radiating Main beam is gradually reduced.As shown in figure 9, when delay time is zero, array sound
The radiation Main beam of wave emitter is symmetrically distributed in array sound radiator two sides；With the increase of delay time, array
The radiation Main beam of sound radiator moves closer to the direction of array sound radiator arrangement, and deflection angle becomes larger.Such as figure
Shown in 10, when amplitude weight is small to the symmetrical monotone decreasing in two sides from center, the radiation Main beam angular width of array sound radiator
Become larger, side lobe levels reduce；When amplitude weight is symmetrically increased monotonically from center to two sides, the radiation master of array sound radiator
Main lobe width becomes smaller, and side lobe levels increase.The shear wave energy that array sound radiator motivates in infinitely great fluid is distributed bent
The 3dB angular width of shear wave energy distribution curve of the 3dB angular width of line than motivating in near-borehole formation is small.
It is provided by the invention a kind of for the array acoustic irradiation device and method for boring forward sight acoustic logging, comprising:
It is set to array sound radiator, acquiring unit and the exciting unit of drill collar outer surface；Array sound radiator includes: edge
Multiple acoustic irradiation stations of same axis arrangement；Acoustic irradiation station includes: multiple piezoelectric vibrators；Each piezoelectric vibrator is respectively arranged at
In each groove that drill collar outer surface is along the circumferential direction uniformly arranged；Acquiring unit is suitable for for obtaining with brill forward sight cement bond logging
The control parameter of well；Control parameter include: adjacent acoustic wave radiation stand applied pumping signal delay time and each sound wave spoke
Penetrate the amplitude weight for the pumping signal that station is applied；Exciting unit, for motivating each acoustic irradiation station using control parameter, with spoke
Penetrate acoustic wave energy.The application by adjusting the pumping signal at acoustic irradiation station each in array sound radiator amplitude and phase
Etc. parameters can control the vertical directivity of array sound radiator, make acoustic wave energy as much as possible to spoke in front of drill bit
It penetrates, to increase the detection range of instrument and improve the signal-to-noise ratio for receiving signal, has before improving acoustic logging while drilling instrument
Depending on the beneficial effect of detectivity.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (10)
1. a kind of for the array acoustic irradiation device for boring forward sight acoustic logging characterized by comprising be set to drill collar
Array sound radiator, acquiring unit and the exciting unit of outer surface；The array sound radiator includes: along same axis
Multiple acoustic irradiation stations of line arrangement；The acoustic irradiation station includes: multiple piezoelectric vibrators；
Each piezoelectric vibrator is respectively arranged in each groove that the drill collar outer surface is along the circumferential direction uniformly arranged；
The acquiring unit is suitable for the control parameter with brill forward sight acoustic logging for obtaining；The control parameter packet
It includes: the excitation that the delay time for the pumping signal that the adjacent acoustic irradiation station is applied and each acoustic irradiation station are applied
The amplitude weight of signal；
The exciting unit, for motivating each acoustic irradiation station using the control parameter, with radiative acoustic wave energy.
2. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The acoustic irradiation station further include: the first acoustic-electric slider being set between each piezoelectric vibrator and corresponding groove is used
In isolation acoustic-electric.
3. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The array sound radiator further include: be set to the rising tone between each acoustic irradiation station and be electrically isolated body, for every
From acoustic-electric.
4. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The operating frequency range of each piezoelectric vibrator is 5kHz to 25kHz.
5. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
Each acoustic irradiation station includes at least four piezoelectric vibrators.
6. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
Each acoustic irradiation station is along drill collar axis arranged at equal intervals；The dominant frequency for the pumping signal that each acoustic irradiation station is applied is equal
It is equal；The delay time for the pumping signal that the adjacent acoustic irradiation station is applied is equal.
7. according to claim 6 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The deflection angle theta of radiation Main beam of the array sound radiator in wellsMeet following relational expression:
Wherein, d is the distance between the central point at the adjacent acoustic irradiation station, VfFor the longitudinal wave velocity of mud in well, τ is phase
The delay time for the pumping signal that the adjacent acoustic irradiation station is applied.
8. according to claim 1 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The deflection angle theta of radiation Main beam of the array sound radiator in wellsNo more than sound wave by being incident in borehole wall circle in well
The first critical angle in face.
9. according to claim 8 for the array acoustic irradiation device for boring forward sight acoustic logging, which is characterized in that
The first critical angle θcSpecifically:
θc=arcsin (Vf/Vp)
Wherein, VfFor the longitudinal wave velocity of mud in well, VpFor the longitudinal wave velocity of near-borehole formation.
10. a kind of for being applied to any one in claim 1-9 with the array acoustic irradiation method for boring forward sight acoustic logging
It is used for described in the array acoustic irradiation device for boring forward sight acoustic logging characterized by comprising
It obtains and is suitable for the control parameter with brill forward sight acoustic logging；The control parameter includes: the adjacent sound wave spoke
The amplitude weight for the pumping signal that the delay time and each acoustic irradiation station for penetrating the pumping signal that station is applied are applied；
Each acoustic irradiation station is motivated using the control parameter, with radiative acoustic wave energy.
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Application publication date: 20190125 |