CN108071385A - A kind of measuring method and circuit with brill electromagnetic resistivity Amplitude Ration and phase difference - Google Patents
A kind of measuring method and circuit with brill electromagnetic resistivity Amplitude Ration and phase difference Download PDFInfo
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- CN108071385A CN108071385A CN201611019419.7A CN201611019419A CN108071385A CN 108071385 A CN108071385 A CN 108071385A CN 201611019419 A CN201611019419 A CN 201611019419A CN 108071385 A CN108071385 A CN 108071385A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
Abstract
The invention discloses a kind of with the measuring method and circuit of boring electromagnetic resistivity Amplitude Ration and phase difference.Measuring method includes：The electromagnetic wave signal that the two-way received contains tested formation information is mixed respectively to obtain the high-frequency signal and intermediate-freuqncy signal per in electromagnetic wave signal all the way with the reference signal of a setpoint frequency；To carrying out intermediate frequency bandpass filtering per the high-frequency signal in electromagnetic wave signal all the way and intermediate-freuqncy signal, retain intermediate-freuqncy signal；Analog-to-digital conversion and acquisition are carried out to the intermediate-freuqncy signal in per electromagnetic wave signal all the way, often carry out an analog-to-digital conversion using the gap of this analog-to-digital conversion and next analog-to-digital conversion to carrying out accumulating operation processing per sampled digital signal all the way after this analog-to-digital conversion collecting；According to the processing of two-way sampled digital signal accumulating operation as a result, the Amplitude Ration and phase difference of generation two-way sampled digital signal.It can be reduced with the Amplitude Ration and the complexity of phase difference measurement and calculating processing bored in electromagnetic resistivity measuring system using the present invention.
Description
Technical field
The present invention relates to oil and gas development and exploration engineering field more particularly to it is a kind of with bore electromagnetic resistivity Amplitude Ration and
The measuring method and circuit of phase difference.
Background technology
Resistivity logging while drilling instrument can instruct While-drilling borehole track to exist as much as possible by the method for measuring formation resistivity
Drilling in storage so as to effectively increase the drainage area of reservoir, improves recovery ratio.The LWD resistivity log instrument used at present
To be most widely used with brill electromagnetic resistivity measurement.Since electromagnetic wave generates amplitude fading and phase is inclined in penetrating ground
It moves, and generates amplitude fading and phase offset and determined by the resistivity on stratum and the characteristic of dielectric constant.Electromagnetic wave is being worn
The amplitude fading and phase offset generated during more different stratum media is different, and the electromagnetic wave of different frequencies is to stratum media
Response characteristic is also different.The electromagnetic wave of 10MHz frequencies above, the amplitude fading generated and main Jie with stratum of phase offset
Electric constant is related；And the electromagnetic wave of below 10MHz, the electromagnetic wave amplitude fading generated and the main electricity with stratum of phase offset
Resistance rate is related.
It is needed with electromagnetic resistivity measurement technology is bored through digital signal processor, field programmable gate array/complexity
The random access memory of programmable logic device and large capacity carries out electromagnetic wave and amplitude fading and phase is generated in penetrating ground
The measurement and calculating of position offset.The technical solution carries out high-speed sampling to the electromagnetic wave signal of reception first, recycles number letter
The high-speed floating point computing of number processor, the high speed logic operational capability of field programmable gate array/Complex Programmable Logic Devices,
And the storage capacity of large capacity random access memory carries out the storage and computing of big data.Specifically, first to two reception days
The two-way electromagnetic wave signal that line coil receives is sampled in large quantities, then stores sampled data to large capacity random storage
In device.Digital signal processor is supplied to after substantial amounts of data have been gathered, field programmable gate array/complexity can be compiled
Journey logical device carries out complicated floating-point operation.Finally calculate the two-way electromagnetic wave signal that two receiving antenna coils are received
Amplitude fading and phase offset.
The deficiencies in the prior art are：Due to digital signal processor, field programmable gate array/complex programmable logic
The power consumption of these chips of device and the random access memory of large capacity is very high, circuit design get up it is also extremely complex, to bore survey
Amount system so needs battery powered, and circuit board installation space is limited, is operated in high temperature, the environment of high vibration is very unfavorable
's.
The content of the invention
For above-mentioned technical problem, the present invention provides a kind of with the measurement for boring electromagnetic resistivity Amplitude Ration and phase difference
Method comprises the following steps：
The two-way received is contained into the electromagnetic wave signal of the tested formation information reference signal with a setpoint frequency respectively
Frequency mixing processing is carried out, is obtained per the high-frequency signal and intermediate-freuqncy signal in electromagnetic wave signal all the way；
Intermediate frequency bandpass filtering treatment is carried out to the high-frequency signal per in electromagnetic wave signal all the way and intermediate-freuqncy signal, is retained
The intermediate-freuqncy signal；
To carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, turn wherein often carrying out a modulus
Change the gap using this analog-to-digital conversion and next analog-to-digital conversion to after this analog-to-digital conversion collecting per hits all the way
Word signal carries out accumulating operation processing；
According to two-way sampled digital signal accumulating operation handle as a result, generating the two-way sampled digital signal
Amplitude Ration and phase difference.
In one embodiment, set respectively with one in the electromagnetic wave signal that the two-way received is contained to tested formation information
It is further comprising the steps of before the reference signal of frequency carries out Frequency mixing processing：
It is amplified processing, generation two respectively to the electromagnetic wave signal that the two-way received contains tested formation information
The electromagnetic wave signal of the pending Frequency mixing processing in road.
In one embodiment, to carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, being will be every
The intermediate-freuqncy signal in multiple cycles carries out analog-to-digital conversion and acquisition in electromagnetic wave signal all the way.
In one embodiment, to carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, including：
An analog-to-digital conversion is often carried out, is gathered in every sampled digital signal a cycle all the way after this analog-to-digital conversion
One sampled point, there is N number of sampled point in each cycle.
In one embodiment, gap pair of the analog-to-digital conversion using this analog-to-digital conversion and next analog-to-digital conversion is often carried out
Accumulating operation processing is carried out per sampled digital signal all the way after this analog-to-digital conversion collected, including：
Gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, by being somebody's turn to do in current period
The data of sampled point and the sampled point of correspondence position in preceding each cycle carry out accumulation process, and N number of adopt is obtained after the completion of accumulation process
Sample data accumulation and；
It often completes a sampled data to add up the accumulation process of sum, will tire out per the sampled data of sampled digital signal all the way
Sum it up add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
In one embodiment, according to two-way sampled digital signal accumulating operation handle as a result, generating the two-way
The Amplitude Ration and phase difference of sampled digital signal, including：
It determines the amplitude of first via sampled digital signal and the second road sampled digital signal, is respectively defined as AMPLITUDE1
And AMPLITUDE2, wherein,
It determines the phase of first via sampled digital signal and the second road sampled digital signal, is respectively defined as PHASE1With
PHASE2, wherein,
According to AMPLITUDE1、AMPLITUDE2、PHASE1And PHASE2Determine two-way sampled digital signal Amplitude Ration and
Phase difference, wherein,
Amplitude Ration=AMPLITUDE of two-way sampled digital signal1/AMPLITUDE2, the phase of two-way sampled digital signal
Difference is PHASE1-PHASE2；
Wherein,Represent that the add up in-phase component of sum of N number of sampled data of first via sampled digital signal adds up
Obtained summation is handled,Represent that the add up quadrature component of sum of N number of sampled data of first via sampled digital signal is tired out
Add the summation that processing obtains,Represent the second road sampled digital signal N number of sampled data add up sum in-phase component carry out
The summation that accumulation process obtains,Represent the second road sampled digital signal N number of sampled data add up sum quadrature component into
The summation that row accumulation process obtains.
According to another aspect of the present invention, additionally provide a kind of with the measurement for boring electromagnetic resistivity Amplitude Ration and phase difference
Circuit, including：
Frequency mixer is used for the electromagnetic wave signal point that the two-way that two reception antennas receive is contained tested formation information
Frequency mixing processing is not carried out with the reference signal of a setpoint frequency, obtains believing per the high-frequency signal in electromagnetic wave signal all the way and intermediate frequency
Number；
Wave filter is electrically connected with the frequency mixer, for the every electromagnetic wave signal all the way exported to the frequency mixer
In high-frequency signal and intermediate-freuqncy signal carry out intermediate frequency bandpass filtering treatment, retain the intermediate-freuqncy signal；
Analog-digital converter is electrically connected with the wave filter, for the every electromagnetic wave all the way exported to the wave filter
Intermediate-freuqncy signal in signal carries out analog-to-digital conversion and acquisition；
Microprocessor is electrically connected with the analog-digital converter, this mould is utilized for often carrying out an analog-to-digital conversion
Number conversion and the gap of next analog-to-digital conversion, after this analog-to-digital conversion collected to the analog-digital converter per sampling all the way
Digital signal carry out accumulating operation processing, and according to two-way sampled digital signal accumulating operation handle as a result, generation institute
State the Amplitude Ration and phase difference of two-way sampled digital signal.
In one embodiment, further include：Signal amplifier, be used to containing the two-way that two reception antennas receive by
The electromagnetic wave signal for surveying formation information is amplified processing respectively, and the amplified signal of two-way is supplied to the frequency mixer.
In one embodiment, the analog-digital converter is specifically used for：An analog-to-digital conversion is often carried out, this modulus is gathered and turns
A sampled point in every sampled digital signal a cycle all the way after changing, there is N number of sampled point in each cycle.
In one embodiment, the microprocessor is specifically used for：
Gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, by being somebody's turn to do in current period
The data of sampled point and the sampled point of correspondence position in preceding each cycle carry out accumulation process, and N number of adopt is obtained after the completion of accumulation process
Sample data accumulation and；
It often completes a sampled data to add up the accumulation process of sum, will tire out per the sampled data of sampled digital signal all the way
Sum it up add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
Compared with prior art, one or more embodiments of the invention can have the following advantages that：
First, the gap two-way hits to collecting respectively of Analog-digital Converter twice is utilized in the embodiment of the present invention
Word signal carries out computing, and the data collected every time are there is no need to store, the storage energy of the random access memory of microprocessor internal
Power can meet storage demand namely the analog-digital converter of large capacity random access memory storage continuous sampling is not required
Output signal.In this way, the complexity with the measuring circuit for boring electromagnetic resistivity Amplitude Ration and phase difference can be reduced, and then
Circuit system power consumption is reduced, improves the life and reliability of circuit system.
Second, computing is carried out using the gap of Analog-digital Converter twice in the embodiment of the present invention, without carrying out big data
Calculating processing namely the higher chip of this kind of power consumption of field programmable gate array/Complex Programmable Logic Devices need not be increased,
Circuit structure is optimized, reduces circuit system power consumption, improves the life and reliability of circuit system.
3rd, it will be per the electromagnetic wave signal and the base of setpoint frequency all the way containing tested formation information in the embodiment of the present invention
Calibration signal carries out mixing and obtains the intermediate-freuqncy signal containing tested formation information with filtering, which had both remained tested stratum
Information, and the frequency of electromagnetic wave signal is reduced, it can effectively reduce the complexity of data processing.
Other features and advantages of the present invention will be illustrated in the following description, also, partly becomes from specification
It obtains it is clear that being understood by implementing the present invention.The purpose of the present invention and other advantages can be by specification, rights
Specifically noted structure is realized and obtained in claim and attached drawing.
Description of the drawings
Attached drawing is used for providing a further understanding of the present invention, and a part for constitution instruction, the reality with the present invention
It applies example to be provided commonly for explaining the present invention, not be construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the flow with the measuring method for boring electromagnetic resistivity Amplitude Ration and phase difference of first embodiment of the invention
Figure；
Fig. 2 is the flow chart of the method for sampling of the intermediate-freuqncy signal Fi of first embodiment of the invention；
Fig. 3 is showing with the measuring circuit structure for boring electromagnetic resistivity Amplitude Ration and phase difference for second embodiment of the invention
It is intended to；
Fig. 4 is the circuit diagram of the analog-digital converter of second embodiment of the invention；
Fig. 5 is the circuit diagram of the Direct Digital Frequency Synthesizers of second embodiment of the invention；
Fig. 6 is the circuit diagram of the microprocessor of second embodiment of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made below in conjunction with attached drawing further
Ground is described in detail.
First embodiment
Fig. 1 is the flow with the measuring method for boring electromagnetic resistivity Amplitude Ration and phase difference of first embodiment of the invention
Figure.This method is illustrated with reference to Fig. 1.
Step S110 and step S120 mainly introduce how the electromagnetic wave that tested formation information is contained to the two-way that receives
Signal is pre-processed, and specific preprocessing process can include Frequency mixing processing and filtering process, and detailed description are as follows：
Step S110, by the two-way received contain the electromagnetic wave signal of tested formation information respectively with a setpoint frequency
Reference signal carries out Frequency mixing processing, obtains per the high-frequency signal and intermediate-freuqncy signal in electromagnetic wave signal all the way；
The electromagnetic wave containing tested formation information is received respectively using remote receiving antenna coil and nearly receiving antenna coil to believe
Number, the electromagnetic wave signal here containing tested formation information is generation amplitude fading and the electromagnetic wave signal of phase offset.
The reference signal of generation setpoint frequency is needed before Frequency mixing processing is carried out, Direct Digital Frequency Synthesizers can be passed through
(DDS) generate, setpoint frequency can be 2.001953MHz, be similar to 2MHz.
Assuming that the high-frequency signal that it is Ft=Fx+Fi that the electromagnetic wave signal received, which is frequency, with frequency close to the base of 2MHz
After calibration signal carries out Frequency mixing processing, the high-frequency signal that frequency is 2Fx+Fi and the intermediate-freuqncy signal that frequency is Fi are obtained.
Preferably, the two-way received is contained the electromagnetic wave signal of tested formation information respectively with a setpoint frequency
It is further comprising the steps of before reference signal carries out Frequency mixing processing：
It is amplified processing, generation two respectively to the electromagnetic wave signal that the two-way received contains tested formation information
The electromagnetic wave signal of the pending Frequency mixing processing in road.
Specifically, the electromagnetic wave signal received obtains the height that frequency is Ft=Fx+Fi after signal amplifier amplifies
Frequency signal, after the reference signal of itself and frequency close to 2MHz then are carried out mixing conversion, it is 2Fx+Fi's to respectively obtain frequency
High-frequency signal and the intermediate-freuqncy signal that frequency is Fi.
Step S120 carries out intermediate frequency bandpass filtering to the high-frequency signal per in electromagnetic wave signal all the way and intermediate-freuqncy signal
Processing, retains the intermediate-freuqncy signal；
In this step, the intermediate-freuqncy signal that the high-frequency signal that frequency is 2Fx+Fi every all the way is Fi with frequency is passed through into intermediate frequency
The intermediate-freuqncy signal that only output frequency is Fi=1.953kHz after bandpass filter is filtered.The intermediate-freuqncy signal had both remained tested
Formation information, and the frequency of electromagnetic wave signal is reduced, it can effectively reduce the complexity of data processing.
After being pre-processed to the electromagnetic wave signal that the two-way received contains tested formation information, carry out data acquisition with
Computing, detailed process are as follows：
Step S130, to carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, wherein often carrying out
Analog-to-digital conversion is using the gap of this analog-to-digital conversion and next analog-to-digital conversion to every after this analog-to-digital conversion collecting
Sampled digital signal carries out accumulating operation processing all the way.
Specifically, using the remote two-way analog-digital converter received with proximity that receives respectively to the intermediate frequency in two-way electromagnetic wave signal
Signal carries out analog-to-digital conversion, and two-way analog-digital converter uses converts startup design simultaneously so that the acquisition of two analog-digital converters
It is fully synchronized.
Preferably, it is to per electric all the way to carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way
The intermediate-freuqncy signal in multiple cycles carries out analog-to-digital conversion and acquisition in magnetostatic wave signal.
When carrying out analog-to-digital conversion and sampling to intermediate-freuqncy signal, to avoid external interference, it is necessary to carry out mould to multiple cycles
Number conversion and sampling.
Preferably, to carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, including：
An analog-to-digital conversion is often carried out, is gathered in every sampled digital signal a cycle all the way after this analog-to-digital conversion
One sampled point, there is N number of sampled point in each cycle.
The sample frequency of analog-digital converter can be 128 times of the intermediate-freuqncy signal of generation.In practical applications, can also select
Select 64 times, 256 times etc..Selection of multiple mainly considers following two factors at this：
(1) must be 4 integral multiple, so sample a cycle be segmented into 4 equal portions.Understand in terms of angle, quite
In 360 degree of a cycle, 4 90 degree can be divided into, can thus pass through an array representation sine and cosine, i.e. sin
(90 ° of+α)=cos (α).
(2) multiple cannot be less than 64, otherwise can introduce too big sampling error.4096 can not be more than, can so be exceeded
The ability in sampling of analog-digital converter and the computing capability of microcontroller.
Fig. 2 is the flow chart of the method for sampling of the intermediate-freuqncy signal Fi of first embodiment of the invention.With reference to Fig. 2, can include
Following steps：
Step S210, input Fi intermediate-freuqncy signals to 16 analog-digital converters；
Step S220, analog-digital converter sample Fi intermediate-freuqncy signals with the sample frequency of 250KHz；
Step S230 judges whether to have gathered and completes 256 cycles, if so, step S240 is transferred to, if it is not, being transferred to step
S220；
S240 terminates.
Due to signal Fi=1.953kHz, the sample frequency of analog-digital converter is 250kHz, therefore is carried out for Fi signals
During sampling, the sampling number in each cycle of Fi signals is：250kHz/1.953kHz=128.0082, close to 128.Modulus
Converter often completes that 32768 sampled datas are obtained during once sampling to Fi signals, therefore need to be to the 256 of Fi signals
(32768/128) a cycle is sampled.
What is chosen is that hits is 128, and those skilled in the art can also set without creative efforts
Count out the computing system that hits is 64,256,512 etc..
This analog-to-digital conversion and next analog-to-digital conversion are utilized below for an analog-to-digital conversion is often carried out in step S130
Gap to carried out after this analog-to-digital conversion collecting per sampled digital signal all the way accumulating operation processing (while convert gather while
Calculation process) specific implementation process illustrate.
First, the two-way sampled digital signal collected is transported respectively using the gap of Analog-digital Converter twice
It calculates, there is no need to store, the storage capacity of the random access memory of microprocessor internal can meet the data collected every time
Storage demand namely be not required large capacity random access memory storage continuous sampling analog-digital converter output signal.
In this way, the complexity with the measuring circuit for boring electromagnetic resistivity Amplitude Ration and phase difference can be reduced, and then reduce circuit system
System power consumption improves the life and reliability of circuit system.
Secondly, computing is carried out using the gap of Analog-digital Converter twice, often gathers a data and carry out once-through operation, nothing
It need to carry out the calculating processing of mass data namely need not to increase field programmable gate array/Complex Programmable Logic Devices this kind of
The higher chip of power consumption optimizes circuit structure, reduces circuit system power consumption, improves the life and reliability of circuit system.
Preferably, often carry out an analog-to-digital conversion using this analog-to-digital conversion with next time analog-to-digital conversion gap to collecting
This analog-to-digital conversion after accumulating operation processing is carried out per sampled digital signal all the way, including：
(1) gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, it will be in current period
The sampled point and preceding each cycle in the data of sampled point of correspondence position carry out accumulation process, obtain N after the completion of accumulation process
A sampled data add up and；
It,, will to reduce the influence of noise since sampling number is 128 in each cycle of Fi signals in (1)
I-th (i=1,2,3 ... 128) a sampled value adds up respectively in each Fi signal periods (totally 256 cycles).By 32768
Sampled point is divided into 128 groups, and every group is respectively defined as one " bin ", and every group of data are added up, and obtains 128 samplings
Data accumulation and.
" bin " can be expressed as：
Wherein, biniRepresent the cumulative of ith sample point data in signal Fi each cycles and.Due to each periodic sampling
128 points, therefore the phase of each " bin " differs 360/128=2.8 °.
(2) sampled data is often completed to add up the accumulation process of sum, it will be per the hits of sampled digital signal all the way
According to it is cumulative and add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
Since all sampled points are divided into 128 groups, every 32 "group " bin " differs pi/2.Distinguished according to quadrature sampling method
Define " X " signal and " R " signal." X " signal and " R " signal are respectively the in-phase component and quadrature component of sampled digital signal.
The principle of quadrature sampling is illustrated below.
Assuming that signal S (t)=Acos (ω t+ φ), acquires signal during t=0 and t=T/4 respectively.
During t=0,During t=T/4,
Order
Then the amplitude of former sinusoidal signal and phase are respectively：
The specific implementation process of (1) and (2) is illustrated based on above-mentioned analysis.
" X " signal is：R_SIN[n]*bini, n=0,1,2...127；
" R " signal is：R_SIN[(n+32)\128]*bini, n=0,1,2...127.
R_SIN [n]=INT (32768*sin (n*2 π/128)), n=0,1,2...127.By being multiplied by 32768, then
Sinusoidal or cosine floating number is converted into integer by round numbers part.Rounding can reduce subsequent calculation amount.
1) 1 integer array R_SIN [128] is initialized.Initialize 4 long numbers, XF0=0, RF0=0, XN0=0, RN0
=0.
2) the two-way analog-digital converter that synchronous averaging far receives and proximity is received gathers remote after the 1st analog-to-digital conversion respectively
Receive the 1st sampled point in the 1st cycle of two-way sampled digital signal received with proximity.An analog-to-digital conversion is often carried out, is adopted
Collect a sampled point in every sampled digital signal a cycle all the way after this analog-to-digital conversion.Carry out 128 analog-to-digital conversions
Afterwards, collect respectively it is remote receive and 128 data in the 1st cycle of two-way sampled digital signal that proximity is received, and by this 128
A data are stored in the memory of microprocessor internal successively.
When gathering the sampled point in the 2nd cycle of two-way sampled digital signal respectively, often gathering a sampled point should
Sampled point and the sampled point of the position in the 1st cycle add up, in this way, the data collected just do not have to then store, tire out
Data after adding continue storage into the memory of microprocessor internal.Accumulating operation is carried out in the gap of analog-to-digital conversion.Example
Such as, the 3rd sampled point in the 2nd cycle is gathered, using the gap of this analog-to-digital conversion and next analog-to-digital conversion by the 2nd cycle
The data of the 3rd sampled point and the 3rd sampled point in the 1st cycle add up.
When carrying out the 3rd periodic sampling, a sampled point is often gathered by the data of the sampled point and memory corresponding position
Data add up, and will it is cumulative after result be stored in memory corresponding position.For example, the 3rd of the 3rd cycle of acquisition
Sampled point, using this analog-to-digital conversion and next analog-to-digital conversion gap by the data of the 3rd sampled point in the 3rd cycle with it is interior
3rd data of storage add up, then store the result into the position.
It is repeated in the 255th cycle.
3) when carrying out the 256th periodic sampling, by the 1st sampled point in the 256th cycle and the 1st of memory storage
Data are added to obtain AF1、AN1, R_SIN [0] and R_SIN [32] are multiplied by respectively, are calculated：
XF1=XF0+AF1* R_SIN [0], RF1=RF0+AF1* R_SIN [32],
XN1=XN0+AN1* R_SIN [0], RN1=RN0+AF1*R_SIN[32]。
2nd sampled point in the 256th cycle is added to obtain A with the 2nd data that memory is storedF2、AN2, multiply respectively
With R_SIN [1] and R_SIN [33], it is calculated：
XF2=XF1+AF2* R_SIN [1], RF2=RF1+AF2* R_SIN [33],
XN2=XN1+AN2* R_SIN [1], RN2=RN1+AN2*R_SIN[33]。
The above computing for being multiplied and adding up is completed in the gap of analog-to-digital conversion twice.
It is repeated in, the 95th data that the 95th sampled point and the memory in the 256th cycle are stored is added to obtain
AF95, AN95, R_SIN [95] and R_SIN [0] are multiplied by respectively, then are repeated in 128 times.
Finally：It is calculated：
XF128=XF127+AF128* R_SIN [127], RF128=RF127+AF128* R_SIN [31],
XN128=XN127+AN128* R_SIN [127], RN128=RN127+AN128*R_SIN[31]。
Step S140 is sampled according to what the two-way sampled digital signal accumulating operation was handled as a result, generating the two-way
The Amplitude Ration and phase difference of digital signal.
The specific implementation process of step S140 is as follows：
It determines the amplitude of first via sampled digital signal and the second road sampled digital signal, is respectively defined as AMPLITUDE1
And AMPLITUDE2, wherein,
It determines the phase of first via sampled digital signal and the second road sampled digital signal, is respectively defined as PHASE1With
PHASE2, wherein,
According to AMPLITUDE1、AMPLITUDE2、PHASE1And PHASE2Determine two-way sampled digital signal Amplitude Ration and
Phase difference, wherein,
Amplitude Ration=AMPLITUDE of two-way sampled digital signal1/AMPLITUDE2, the phase of two-way sampled digital signal
Difference is PHASE1-PHASE2；
Wherein,Represent that the add up in-phase component of sum of N number of sampled data of first via sampled digital signal adds up
Obtained summation is handled,Represent that the add up quadrature component of sum of N number of sampled data of first via sampled digital signal is tired out
Add the summation that processing obtains,Represent the second road sampled digital signal N number of sampled data add up sum in-phase component carry out
The summation that accumulation process obtains,Represent the second road sampled digital signal N number of sampled data add up sum quadrature component into
The summation that row accumulation process obtains.
Specifically, according to the X obtained in above-mentioned steps step S130F128、RF128、XN128、RN128Determine two-way sampling number
The Amplitude Ration and phase difference of signal.
First, the amplitude and phase far received is calculated：
AMPLITUDEF=SQRT (XF128 2+RF128 2), PHASEF=ARCTAN2 (XF128,RF128)；
Again, the amplitude and phase that proximity is received are calculated：
AMPLITUDEN=SQRT (XN128 2+RN128 2), PHASEN=ARCTAN2 (XN128,RN128)；
Finally, the Amplitude Ration and phase difference of two reception antennas are calculated：
Amplitude Ration=AMPLITUDEF/AMPLITUDEN, phase difference=PHASEF-PHASEN。
Calculating process in above step S130 and S140 both can be in underground with the micro- of brill electromagnetic wave resistivity instrument
It is realized in processor, it can also be XF、RF、XN、RNBy being transferred to ground with the Transmission system of brill, on the computer on ground
It calculates and obtains.
It follows that the measuring method provided in an embodiment of the present invention with brill electromagnetic resistivity Amplitude Ration and phase difference,
It can reduce with Amplitude Ration and phase difference measurement in electromagnetic resistivity measuring system and the complexity of calculating processing is bored, most
The complexity of the low entire electromagnetic resistivity system of final decline reduces system power dissipation, improves system lifetim and reliability.
In conclusion the measuring method with brill electromagnetic resistivity Amplitude Ration and phase difference of the present embodiment, is opened in oil gas
Hair is with having actual directive significance in exploration.
Second embodiment
Fig. 3 is showing with the measuring circuit structure for boring electromagnetic resistivity Amplitude Ration and phase difference for second embodiment of the invention
It is intended to.With reference to Fig. 3, which can include frequency mixer 310, wave filter 320, analog-digital converter 330, microprocessor 340,
In,
Frequency mixer is used for the electromagnetic wave signal point that the two-way that two reception antennas receive is contained tested formation information
Frequency mixing processing is not carried out with the reference signal of a setpoint frequency, obtains believing per the high-frequency signal in electromagnetic wave signal all the way and intermediate frequency
Number；
Wave filter is electrically connected with the frequency mixer, for the every electromagnetic wave signal all the way exported to the frequency mixer
In high-frequency signal and intermediate-freuqncy signal carry out intermediate frequency bandpass filtering treatment, retain the intermediate-freuqncy signal；
Analog-digital converter is electrically connected with the wave filter, for the every electromagnetic wave all the way exported to the wave filter
Intermediate-freuqncy signal in signal carries out analog-to-digital conversion and acquisition；
Microprocessor is electrically connected with the analog-digital converter, this mould is utilized for often carrying out an analog-to-digital conversion
Number conversion and the gap of next analog-to-digital conversion, after this analog-to-digital conversion collected to the analog-digital converter per sampling all the way
Digital signal carry out accumulating operation processing, and according to two-way sampled digital signal accumulating operation handle as a result, generation institute
State the Amplitude Ration and phase difference of two-way sampled digital signal.
Preferably, further include：Signal amplifier 350 is used to contain the two-way that two reception antennas receive tested
The electromagnetic wave signal of formation information is amplified processing respectively, and the amplified signal of two-way is supplied to the frequency mixer.
Preferably, the analog-digital converter is specifically used for：An analog-to-digital conversion is often carried out, after gathering this analog-to-digital conversion
Per a sampled point in sampled digital signal a cycle all the way, there is N number of sampled point in each cycle.
Preferably, the microprocessor is specifically used for：
Gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, by being somebody's turn to do in current period
The data of sampled point and the sampled point of correspondence position in preceding each cycle carry out accumulation process, and N number of adopt is obtained after the completion of accumulation process
Sample data accumulation and；
It often completes a sampled data to add up the accumulation process of sum, will tire out per the sampled data of sampled digital signal all the way
Sum it up add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
The specific design of each circuit in Fig. 3 can be as follows：
The circuit design of frequency mixer 310 and signal amplifier 350 is the prior art, and details are not described herein again.Wave filter 320 is adopted
Use if bandpas filter.
Fig. 4 is the circuit diagram of the analog-digital converter of second embodiment of the invention.With reference to Fig. 4, analog-digital converter includes
First capacitance C14, the second capacitance C15, the 3rd capacitance C16, the 4th capacitance C17, the 5th capacitance C18, the 6th capacitance C19, the 7th
Capacitance C20, the 8th capacitance C21, the first modulus conversion chip U3, the second modulus conversion chip U4, the first reference signal generate core
Piece U5, wherein,
First capacitance, the second capacitance, the 4th capacitance any capacitance one into the 6th capacitance terminate+5V power supplys, another termination
Ground；Any capacitance one end generates the 6th foot of chip with the first reference signal and is connected in 3rd capacitance, the 8th capacitance, other end ground connection；
7th capacitance one end is connected with the 37th foot of the second modulus conversion chip, other end ground connection；First modulus conversion chip and/or second
Modulus conversion chip the 1st, 4 to 6,8,17,20,30,31,33,36,38,39 feet ground connection, the 2nd, 7,18,19 feet connect+5V power supplys,
9th to 16,21 to 29,32,34,35 feet respectively with Master control chip the 15th to 18,32,43,44,46,48,49,60,61,62,
63rd, 2,3,30,29,53,54 feet connect, the 4th, 41,42 feet be connected with input port, the 37th, 40 feet and the first reference signal generation
The 6th foot of chip connects；First reference signal generates the 2nd foot of chip and connects+5V power supplys, the 4th foot ground connection；
Specifically, the first capacitance to the 8th capacitance uses 0.1 μ F capacitances, the first modulus conversion chip and the second analog-to-digital conversion
Chip uses AD7665 modulus conversion chips, and the first reference signal is generated chip and generated using LT1019ACN8-2.5 reference signals
Chip.
The effect of analog to digital conversion circuit is that the analog signal of input is converted to digital signal, wherein：First capacitance is to
The effect of eight capacitances is that signal is filtered, and the effect of the first modulus conversion chip and the second modulus conversion chip is by analog signal
Digital signal is converted to, it is to generate the reference signal of 2.5V that the first reference signal, which generates chip effect,.
A Direct Digital Frequency Synthesizers can also be increased in the circuit structure of Fig. 3, specific circuit design is as follows
It is shown：
Fig. 5 is the circuit diagram of the Direct Digital Frequency Synthesizers of second embodiment of the invention.With reference to Fig. 5, directly number
Word frequency synthesizer includes first resistor R5, second resistance R6,3rd resistor R7, the 8th capacitance C10, the 9th capacitance C11, the tenth
Capacitance C12, the 11st capacitance C13, the first crystal oscillator Y2, the first Digital Frequency Synthesize chip U2, wherein,
First resistor is connected to one end of 3rd resistor with the first Digital Frequency Synthesize chip the 12nd, 21,20 feet respectively, separately
One end is grounded；8th capacitance, the 11st capacitance one end connect+5V power supplys, other end ground connection respectively；9th capacitance, the tenth capacitance one
End is connected respectively with the first Digital Frequency Synthesize chip the 21st, 20 feet, other end ground connection；The 1st foot of first crystal oscillator connects+5V power supplys,
3rd foot is grounded, and the 4th foot is connected with the 9th foot of the first Digital Frequency Synthesize chip；First Digital Frequency Synthesize chip the 5th, 10,19,
24 feet are grounded, the 6th, 11,18 feet connect+5V power supplys, the 7th, 8,22 feet are connected respectively with Master control chip the 7th, 13,14 feet；
Specifically, direct digital synthesis technique circuit first resistor uses 11K Ω resistance, second resistance is using 100 Ω electricity
Resistance, 3rd resistor use 100 Ω resistance, and the 8th capacitance uses 0.1 μ F capacitances, and the 9th capacitance uses 220pF capacitances, the tenth capacitance
Using 220pF capacitances, the 11st capacitance uses 0.1 μ F capacitances, and the first crystal oscillator uses 32MHz crystal oscillators, the first Digital Frequency Synthesize
Chip uses AD9850 Digital Frequency Synthesize chips.
Direct digital synthesis technique circuit function is the frequency signal for generating 2.001953MHz, wherein：First resistor acts on
It is limitation electric current, second resistance effect is that current signal is converted to voltage signal, and 3rd resistor effect is to turn current signal
Voltage signal is changed to, the effect of the 8th capacitance is that signal is filtered, and the effect of the 9th capacitance is that signal is filtered, the tenth electricity
Appearance effect is that signal is filtered, and the effect of the 11st capacitance is that signal is filtered, and the effect of the first crystal oscillator is to generate 32MHz
The signal of frequency, the effect of the first Digital Frequency Synthesize chip are to synthesize the digital signal of 2.001953MHz frequencies.
Fig. 6 is the circuit diagram of the microprocessor of second embodiment of the invention.With reference to Fig. 6, microprocessor includes first
Current-limiting resistance R1, the second current-limiting resistance R2, the first power filtering capacitor C1, second source filter capacitor C2, the 3rd power filter
Capacitance C3, the 4th power filtering capacitor C4, the 5th power filtering capacitor C5, the 6th power filtering capacitor C6, the 7th power filter
Capacitance C7, the 8th power filtering capacitor C8, the 9th power filtering capacitor C9, the first crystal oscillator Y1, the first plug-in unit ICSP, microcontroller
U1, wherein,
First current-limiting resistance one end is connected with the 7th foot of microcontroller, the other end with first power filtering capacitor one end phase
Connection；Second current-limiting resistance one end is connected with first power filtering capacitor one end, another termination 5V power supplys, the first power filter
The capacitance other end is grounded；Second source filter capacitor to the 4th power filtering capacitor one end respectively with microcontroller the 56th, 39,40
Foot connects, other end ground connection；5th power filtering capacitor to the 9th power filtering capacitor one end is connected with 5V power supplys, another termination
Ground；First crystal oscillator one end is connected with the 39th foot of microcontroller, and the other end is connected with the 40th foot of microcontroller；First plug-in unit the 1st, 4,
5 feet are connected respectively with microcontroller the 7th, 15,16 feet, and the 2nd foot is connected with 5V power supplys, the 3rd foot ground connection；Microcontroller the 10th, 19,
26th, 38,57 feet are connected with 5V power supplys, the 9th, 20,25,41 feet ground connection.
Specifically, the first current-limiting resistance R1 use 620 Ω resistance, the second current-limiting resistance R2 use 4.7K Ω resistance, first
Power filtering capacitor uses 0.1 μ F ceramic disc capacitors, and second source filter capacitor uses 10 μ F ceramic disc capacitors, the 3rd power filter electricity
Hold using 10pF ceramic disc capacitors, the 4th power filtering capacitor uses 10pF ceramic disc capacitors, and the 5th power filtering capacitor uses 0.1 μ F
Ceramic disc capacitor, the 6th power filtering capacitor use 0.1 μ F ceramic disc capacitors, and the 7th power filtering capacitor uses 0.1 μ F ceramic disc capacitors,
8th power filtering capacitor uses 0.1 μ F ceramic disc capacitors, and the 9th power filtering capacitor is using 0.1 μ F ceramic disc capacitors, the first crystal oscillator
The plug-in unit of single 6 pin is used using 8MHz crystal oscillators, the first plug-in unit, microcontroller uses dsPIC33EP512GM706 processors.
Microprocessor is used for the working condition of control circuit board other circuits, the first current-limiting resistance therein, the second current limliting
Resistance is used for limiting source current, and the first power filtering capacitor to the 9th power filtering capacitor is used for filtering the power supply of microprocessor
Ripple, the first crystal oscillator are used for providing clock signal for microprocessor, and the first plug-in unit is used as the online serial programming of microprocessor
Interface, total processor of the microcontroller as microprocessor circuit.
The above is only the specific implementation case of the present invention, and protection scope of the present invention is not limited thereto, any ripe
Those skilled in the art are known in technical specification of the present invention, modifications of the present invention or replacement all should be in the present invention
Protection domain within.
Claims (10)
1. it is a kind of with the measuring method for boring electromagnetic resistivity Amplitude Ration and phase difference, comprise the following steps：
The electromagnetic wave signal that the two-way received contains tested formation information is carried out respectively with the reference signal of a setpoint frequency
Frequency mixing processing is obtained per the high-frequency signal and intermediate-freuqncy signal in electromagnetic wave signal all the way；
To it is described per electromagnetic wave signal all the way in high-frequency signal and intermediate-freuqncy signal carry out intermediate frequency bandpass filtering treatment, described in reservation
Intermediate-freuqncy signal；
To carrying out analog-to-digital conversion and acquisition per the intermediate-freuqncy signal in electromagnetic wave signal all the way, wherein often carrying out an analog-to-digital conversion profit
With the gap of this analog-to-digital conversion and next analog-to-digital conversion to believing per hits word all the way after this analog-to-digital conversion collecting
Number carry out accumulating operation processing；
According to two-way sampled digital signal accumulating operation handle as a result, generating the amplitude of the two-way sampled digital signal
Than and phase difference.
2. according to the method described in claim 1, it is characterized in that, the two-way received is being contained to the electricity of tested formation information
It is further comprising the steps of before magnetostatic wave signal carries out Frequency mixing processing with the reference signal of a setpoint frequency respectively：
It is amplified processing respectively to the electromagnetic wave signal that the two-way received contains tested formation information, generation two-way is treated
Carry out the electromagnetic wave signal of Frequency mixing processing.
3. according to the method described in claim 1, it is characterized in that, to carrying out mould per the intermediate-freuqncy signal in electromagnetic wave signal all the way
Number conversion and acquisition are to carry out analog-to-digital conversion and acquisition to the intermediate-freuqncy signal in multiple cycles in every electromagnetic wave signal all the way.
4. according to the method described in claim 1, it is characterized in that, to carrying out mould per the intermediate-freuqncy signal in electromagnetic wave signal all the way
Number conversion and acquisition, including：
An analog-to-digital conversion is often carried out, gathers one in every sampled digital signal a cycle all the way after this analog-to-digital conversion
Sampled point has N number of sampled point in each cycle.
5. according to the method described in claim 4, it is characterized in that, often carry out analog-to-digital conversion using this analog-to-digital conversion with
The gap of next analog-to-digital conversion after this analog-to-digital conversion collecting per sampled digital signal all the way to carrying out at accumulating operation
Reason, including：
Gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, by the sampling in current period
The data of point and the sampled point of correspondence position in preceding each cycle carry out accumulation process, and N number of hits is obtained after the completion of accumulation process
According to cumulative and；
A sampled data is often completed to add up the accumulation process of sum, will add up per the sampled data of sampled digital signal all the way and
Add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
6. it according to the method described in claim 5, it is characterized in that, is handled according to the two-way sampled digital signal accumulating operation
As a result, generate the Amplitude Ration and phase difference of the two-way sampled digital signal, including：
It determines the amplitude of first via sampled digital signal and the second road sampled digital signal, is respectively defined as AMPLITUDE1With
AMPLITUDE2, wherein,
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It determines the phase of first via sampled digital signal and the second road sampled digital signal, is respectively defined as PHASE1And PHASE2,
Wherein,
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<mi>PHASE</mi>
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According to AMPLITUDE1、AMPLITUDE2、PHASE1And PHASE2Determine the Amplitude Ration and phase of two-way sampled digital signal
Difference, wherein,
Amplitude Ration=AMPLITUDE of two-way sampled digital signal1/AMPLITUDE2, the phase difference of two-way sampled digital signal is
PHASE1-PHASE2；
Wherein,Represent first via sampled digital signal N number of sampled data add up sum in-phase component carry out accumulation process
Obtained summation,Represent that the add up quadrature component of sum of N number of sampled data of first via sampled digital signal carries out cumulative place
Obtained summation is managed,Represent that the add up in-phase component of sum of N number of sampled data of the second road sampled digital signal adds up
Obtained summation is handled,Represent that the add up quadrature component of sum of N number of sampled data of the second road sampled digital signal is tired out
Add the summation that processing obtains.
It is 7. a kind of with the measuring circuit for boring electromagnetic resistivity Amplitude Ration and phase difference, which is characterized in that including：
Frequency mixer, be used for the electromagnetic wave signal that the two-way that two reception antennas receive is contained into tested formation information respectively with
The reference signal of one setpoint frequency carries out Frequency mixing processing, obtains per the high-frequency signal and intermediate-freuqncy signal in electromagnetic wave signal all the way；
Wave filter is electrically connected with the frequency mixer, for the frequency mixer export often all the way in electromagnetic wave signal
High-frequency signal and intermediate-freuqncy signal carry out intermediate frequency bandpass filtering treatment, retain the intermediate-freuqncy signal；
Analog-digital converter is electrically connected with the wave filter, for the every electromagnetic wave signal all the way exported to the wave filter
In intermediate-freuqncy signal carry out analog-to-digital conversion and acquisition；
Microprocessor is electrically connected with the analog-digital converter, is turned for often carrying out an analog-to-digital conversion using this modulus
Change the gap with next analog-to-digital conversion, after this analog-to-digital conversion collected to the analog-digital converter per hits word all the way
Signal carry out accumulating operation processing, and according to two-way sampled digital signal accumulating operation handle as a result, generation described two
The Amplitude Ration and phase difference of road sampled digital signal.
8. measuring circuit according to claim 7, which is characterized in that further include：Signal amplifier is used to connect two
It receives the electromagnetic wave signal that the two-way that receives of antenna contains tested formation information and is amplified processing respectively, and after two-way is amplified
Signal be supplied to the frequency mixer.
9. measuring circuit according to claim 7, which is characterized in that the analog-digital converter is specifically used for：Often carry out one
Secondary analog-to-digital conversion gathers a sampled point in every sampled digital signal a cycle all the way after this analog-to-digital conversion, each
There is N number of sampled point in cycle.
10. measuring circuit according to claim 9, which is characterized in that the microprocessor is specifically used for：
Gap of the sampled point using this analog-to-digital conversion and next analog-to-digital conversion is often gathered, by the sampling in current period
The data of point and the sampled point of correspondence position in preceding each cycle carry out accumulation process, and N number of hits is obtained after the completion of accumulation process
According to cumulative and；
A sampled data is often completed to add up the accumulation process of sum, will add up per the sampled data of sampled digital signal all the way and
Add up with each sampled data before and in-phase component and quadrature component carry out accumulation process respectively.
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