CN109577965A - A kind of segmentation scale method of borehole wall micro-resisitivity image instrument - Google Patents
A kind of segmentation scale method of borehole wall micro-resisitivity image instrument Download PDFInfo
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- CN109577965A CN109577965A CN201811384773.9A CN201811384773A CN109577965A CN 109577965 A CN109577965 A CN 109577965A CN 201811384773 A CN201811384773 A CN 201811384773A CN 109577965 A CN109577965 A CN 109577965A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 230000011218 segmentation Effects 0.000 title claims abstract description 17
- 230000004044 response Effects 0.000 claims abstract description 22
- 238000005259 measurement Methods 0.000 claims abstract description 21
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 238000003384 imaging method Methods 0.000 claims description 22
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 6
- 239000000523 sample Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000000611 regression analysis Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005406 washing 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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Abstract
The invention discloses a kind of segmentation scale methods of borehole wall micro-resisitivity image instrument, comprising: is placed in borehole wall micro-resisitivity image instrument in the standard stratum of known different resistivity；By the array electrode of the borehole wall micro-resisitivity image instrument into standard stratum emission current, measure different resistivity environment under each electrode of instrument response readings；It is read according to standard formation resistivity numerical value and electrode response, determine the functional relation of the borehole wall micro-resisitivity image instrument response readings and true resistivity under different resistivity section, scale of the apparent resistivity that realization borehole wall micro-resisitivity image instrument measurement obtains to true resistivity.The present invention solves the problems, such as that borehole wall micro-resisitivity image instrument can not directly acquire true formation resistivity.
Description
Technical field
The invention belongs to oil well logging field of engineering technology, and in particular to a kind of borehole wall micro-resisitivity image instrument
Segmentation scale method.
Background technique
Multiple pole plates are pushed against on the borehole wall by borehole wall micro-resisitivity image instrument in well logging, by ground installation control
Instrument processed emission current into stratum by the array electrode on pole plate, due to rock composition, structure and the fluid of electrode contact
Property is different, thus causes curent change, to reflect the variation of borehole wall rock resistivity everywhere.
Currently, the resistivity of borehole wall micro-resisitivity image instrument measurement is without scaleover, therefore, well logging is obtained
Data be only capable of the opposite variation tendency of reflection resistivity, i.e. apparent resistivity.True resistivity in order to obtain need to use conventional logging
Obtained shallow lateral resistivity carries out scale to the apparent resistivity that micro-resisitivity image instrument measures.This method needs
Conventional logging data and log interpretation software are relied on, process flow is complicated and is easy to produce mistake.
Patent of invention CN201110455303.9 discloses a kind of calibration check method and device of resistivity tool, should
The amplitude of signal when simulate with different resistivity is placed in by phase difference when method is exposed to air by measured resistivity logging instrument
The Amplitude Ratio and phase difference of signal when stratum, and the Amplitude Ratio by measuring and phase difference determine the amplitude of the resistivity tool
Than functional relation and phase function relationship.In the method, the mode of determining functional relation is according to least square fitting original
Reason, obtains the polynomial in one indeterminate of Amplitude Ratio, phase difference and resistivity.This method needs instrument being respectively placed in air and simulation
It is measured in the two media of stratum, measurement process is relatively complicated.Particularly, for borehole wall small-scale resistance spot welding instrument, apparent resistance
Rate and the relationship of true resistivity can not be stated by polynomial in one indeterminate, therefore this method is not suitable for borehole wall micro-resistivity imaging
Logging instrument.
Patent of invention CN201710866241.8 discloses a kind of electric imaging logging image scale method and device, this method
Electric imaging logging image is obtained according to electric imaging logging data；It is calculated according to electric imaging logging image different deep in well section to be analyzed
The corresponding average current of degree point；In conjunction with the shallow lateral resistivity data in Conventional Logs, establish depth point average current with
The receptance function of shallow lateral resistivity；Function and electric imaging logging image according to response, are calculated depth window average current；Root
According to depth window average current and Conventional Logs, calibration factor is calculated；Electrical imaging image is carried out according to calibration factor
Scale.This method scale still needs to rely on conventional logging data and log interpretation software, process flow are complex.
Document [1] disclose a kind of linear type four probe method scale small-scale resistance spot welding resistivity method and electricity at
As well logging resistivity scale process, full-hole core is made washing oil by this method, the desalinization of soil by flooding or leaching is handled, and configures water identical as water flooding
Type, identical salinity salt water be saturated；Survey line and measuring point are laid on full-hole core, utilize four probe device of linear type
It is measured, and data are arranged；Measuring point is done into cubic spline interpolation, interpolation interval and log data interval phase
Together；Imaging logging data are established into corresponding relationship with four probe datas, are exactly found pair using orientation curve or cross correlation algorithm
Data are answered to arrange；Scale is carried out to Electrical imaging resistivity using regression analysis.This method needs to rely on core data and additionally straight
Four probe device of line style, process flow are complex.
[1] Guo Huaizhi, Pan Baozhi, Liu Wenbin, Zhang Mingyang utilize linear type four probe method scale small-scale resistance spot welding
Resistivity [J] physical prospecting and change are visited, 2017,41 (4): 715-718.
Summary of the invention
The purpose of the present invention is can not directly measure true formation resistivity for borehole wall small-scale resistance spot welding instrument, need to borrow
The problem of helping the shallow lateral resistivity data of conventional logging and log interpretation software to carry out scale, provides a kind of borehole wall micro resistance
The segmentation scale method of rate scanning and imaging logging instrument, this method is according to borehole wall micro resistivity scanning tool in different resistivity mark
Group of functions is established in the apparent resistivity numerical value segmentation measured in quasi- stratum, can directly acquire true formation resistivity.
The present invention adopts the following technical scheme that realize:
A kind of segmentation scale method of borehole wall micro-resisitivity image instrument, this method scan borehole wall microresistivity
Imaging logging instrument is placed in the standard stratum of known different resistivity, passes through the borehole wall micro-resisitivity image instrument
Array electrode emission current I into standard stratum measures different resistivity RiThe response readings N of lower each electrode of instrumenti；According to Ri
With NiIt determines the functional relation of the borehole wall micro-resisitivity image instrument response readings and true resistivity numerical value, realizes well
Scale of the apparent resistivity of wall micro-resisitivity image instrument measurement to true resistivity；Wherein i=1,2 ..., n is electrode
Number.
A further improvement of the present invention lies in that, it is known that the standard stratum of different resistivity is different depth section resistivity value
Known standard well, or can freely to adjust the stratum simulator of resistivity value.
A further improvement of the present invention lies in that the resistivity value range of standard stratum analog includes borehole wall microresistivity
Scanning and imaging logging instrument measurement range.
A further improvement of the present invention lies in that the response readings of borehole wall micro-resisitivity image instrument are apparent resistivity
Numerical value.
A further improvement of the present invention lies in that according to resistivity RiWith response readings NiDetermine that borehole wall microresistivity is scanned into
As the functional relation of logging instrument response readings and true resistivity numerical value, read since borehole wall micro-resisitivity image instrument responds
Simultaneously fixed form is not present in several and true resistivity numerical relation, therefore selects to determine borehole wall micro resistance using the method for being segmented scale
The functional relation of rate scanning and imaging logging instrument response readings and true resistivity numerical value.
A further improvement of the present invention lies in that the method for being segmented scale are as follows: according to measuring the study plot used twice in succession
Layer resistivity numerical value and instrument response are read, according to R and N near-linear dependency in subrange under linearly or logarithmically scale
Relationship obtains multiplying factor k and adds factor b, according between the specified resistivity zone for multiplying factor k and adding factor b that can obtain measurement
Interior borehole wall micro-resisitivity image instrument response degree scale is true resistivity numerical value.
A further improvement of the present invention lies in that the specific implementation steps are as follows for this method:
It is R by borehole wall micro-resisitivity image instrument merging resistivity1Standard stratum in, measure borehole wall micro resistance
The apparent resistivity of rate scanning and imaging logging instrument each electrode in standard stratum is read
It is R by borehole wall micro-resisitivity image instrument merging resistivity2Standard stratum in, measure borehole wall micro resistance
The apparent resistivity of rate scanning and imaging logging instrument each electrode in standard stratum is read
To each electrode n, established respectively when resistivity is located at R1To R2Between when apparent resistivity and true resistivity relationship letter
Number:
Wherein:
In formula,For electrode n between the resistivity zone under any apparent resistivity reading,For apparent resistivityTrue resistivity after scale,For electrode n between the resistivity zone under multiply the factor,It is electrode n in the electricity
Under the resistance rate section plus factor；
Multiply the factor accordingly and add factor calculation formula are as follows:
Wherein:
It repeats the above steps, until each electrode measurement of borehole wall micro-resisitivity image instrument under all testing resistance rates
Apparent resistivity and the functional relation of true resistivity all establish completion；
The above functional relation is merged, scale function group is formed:
Wherein,
After completing borehole wall micro-resisitivity image instrument scale, borehole wall micro-resisitivity image instrument is being used
It is directly true formation resistivity numerical value by the apparent resistivity numerical scale of measurement by scale function group when being logged well.
The present invention has following beneficial technical effect:
A kind of segmentation scale method of borehole wall micro-resisitivity image instrument provided by the invention, the method achieve
Borehole wall micro-resisitivity image instrument directly measures true formation resistivity, compared to conventional method, avoids using conventional
Shallow lateral resistivity data in well-log information reduces system complexity, reduces process flow to the scale of apparent resistivity,
Guarantee that the borehole wall is that resistivity scanning and imaging logging instrument obtains accurate and reliable true formation resistivity data in actual measurement, therefore
The working efficiency of explanation personnel can be effectively improved.
Detailed description of the invention
Fig. 1 is to be measured using the shallow lateral data in Conventional Logs borehole wall micro-resisitivity image instrument
The schematic diagram of apparent resistivity scale.
Fig. 2 is the borehole wall of embodiment of the present invention micro-resisitivity image instrument scale flow chart.
Fig. 3 is the borehole wall of embodiment of the present invention micro-resisitivity image instrument scale method schematic diagram.
Specific embodiment
Invention is further described in detail with reference to the accompanying drawings and examples:
A kind of segmentation scale method of borehole wall micro-resisitivity image instrument provided by the invention, this method comprises:
Borehole wall micro-resisitivity image instrument is placed in the standard stratum of known different resistivity, passes through the well
The array electrode of wall micro-resisitivity image instrument emission current I into standard stratum measures different resistivity RiLower instrument
The response readings N of each electrode of devicei；According to RiWith NiDetermine borehole wall micro-resisitivity image instrument response readings and true
The functional relation of resistivity value realizes the apparent resistivity of borehole wall micro-resisitivity image instrument measurement to true resistivity
Scale；Wherein i=1,2 ..., n.
The purpose of borehole wall micro-resisitivity image instrument scale is: by the obtained apparent resistivity numerical value conversion of measurement at
True formation resistivity numerical value.Therefore, by by borehole wall micro-resisitivity image instrument be placed in different resistivity numerical value mark
It is measured in quasi- stratum, so that it may obtain the functional relation of apparent resistivity and true resistivity under different resistivity section, specifically
Scale process is as shown in Figure 2.The specific implementation of borehole wall micro-resisitivity image instrument scale operation is as follows:
It is R by borehole wall micro-resisitivity image instrument merging resistivity1Standard stratum in, measure borehole wall micro resistance
The apparent resistivity of rate scanning and imaging logging instrument each electrode in standard stratum is readWherein n is electrode number.
It is R by borehole wall micro-resisitivity image instrument merging resistivity2Standard stratum in, measure borehole wall micro resistance
The apparent resistivity of rate scanning and imaging logging instrument each electrode in standard stratum is read
To each electrode n, established respectively when resistivity is located at R1To R2Between when apparent resistivity and true resistivity relationship letter
Number:
Wherein:
In formula,For electrode n between the resistivity zone under any apparent resistivity reading,For apparent resistivityTrue resistivity after scale,For electrode n between the resistivity zone under multiply the factor,It is electrode n in the resistance
Under the rate section plus factor.
Multiply the factor accordingly and add factor calculation formula are as follows:
Wherein:
It repeats the above steps, until each electrode measurement of borehole wall micro-resisitivity image instrument under all testing resistance rates
Apparent resistivity and the functional relation of true resistivity all establish completion, specific scale schematic diagram is as shown in Figure 3.
The above functional relation is merged, scale function group is formed:
Wherein,
After completing borehole wall micro-resisitivity image instrument scale, borehole wall micro-resisitivity image instrument is being used
It is directly true formation resistivity numerical value by the apparent resistivity numerical scale of measurement by scale function group when being logged well.
It is provided for the embodiments of the invention technical solution above to be described in detail, specific case used herein
The principle and embodiment of the embodiment of the present invention are expounded, the explanation of above embodiments is only applicable to help to understand this
The principle of inventive embodiments；At the same time, for those skilled in the art, according to an embodiment of the present invention, in specific embodiment party
There will be changes in formula and application range, in conclusion the contents of this specification are not to be construed as limiting the invention.
The beneficial effect of the embodiment of the present invention is, the present invention proposes a kind of borehole wall micro-resisitivity image instrument
It is segmented scale method, so that borehole wall micro-resisitivity image instrument is directly exported true formation resistivity, reduces system
Complexity reduces process flow, guarantees that the borehole wall is that resistivity scanning and imaging logging instrument obtains accurately and reliably in actual measurement
Obtain true formation resistivity data.
Claims (7)
1. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument, which is characterized in that this method is micro- by the borehole wall
Resistivity scanning and imaging logging instrument is placed in the standard stratum of known different resistivity, is scanned by the borehole wall microresistivity
As logging instrument array electrode into standard stratum emission current I, measure different resistivity RiThe response of lower each electrode of instrument is read
Number Ni；According to RiWith NiDetermine the function of the borehole wall micro-resisitivity image instrument response readings and true resistivity numerical value
Relationship realizes the apparent resistivity of borehole wall micro-resisitivity image instrument measurement to the scale of true resistivity；Wherein i=1,
2 ..., n is electrode number.
2. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 1, feature
It is, it is known that the standard stratum of different resistivity is standard well known to different depth section resistivity value, or being can be free
Adjust the stratum simulator of resistivity value.
3. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 1, feature
It is, the resistivity value range of standard stratum analog includes borehole wall micro-resisitivity image instrument measurement range.
4. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 1, feature
It is, the response readings of borehole wall micro-resisitivity image instrument are apparent resistivity numerical value.
5. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 1, feature
It is, according to resistivity RiWith response readings NiDetermine borehole wall micro-resisitivity image instrument response readings and true resistivity
The functional relation of numerical value, since borehole wall micro-resisitivity image instrument response readings are not deposited with true resistivity numerical relation
In fixed form, thus select to determine using the method for segmentation scale borehole wall micro-resisitivity image instrument response readings with
The functional relation of true resistivity numerical value.
6. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 5, feature
It is, the method for being segmented scale are as follows: it is read according to the standard formation resistivity numerical value used is measured twice in succession with instrument response,
According to the relationship of R and N near-linear dependency in subrange under linearly or logarithmically scale, obtains multiplying factor k and adds factor b,
According to the interior borehole wall micro-resisitivity image in specified resistivity zone for multiplying factor k and adding factor b that can obtain measurement
It is true resistivity numerical value that instrument, which responds degree scale,.
7. a kind of segmentation scale method of borehole wall micro-resisitivity image instrument according to claim 1, feature
It is, the specific implementation steps are as follows for this method:
It is R by borehole wall micro-resisitivity image instrument merging resistivity1Standard stratum in, measurement borehole wall microresistivity sweep
Retouch the apparent resistivity reading of imaging logging instrument each electrode in standard stratum
It is R by borehole wall micro-resisitivity image instrument merging resistivity2Standard stratum in, measurement borehole wall microresistivity sweep
Retouch the apparent resistivity reading of imaging logging instrument each electrode in standard stratum
To each electrode n, established respectively when resistivity is located at R1To R2Between when apparent resistivity and true resistivity relation function:
Wherein:
In formula,For electrode n between the resistivity zone under any apparent resistivity reading,For apparent resistivityIt carves
True resistivity after degree,For electrode n between the resistivity zone under multiply the factor,It is electrode n between the resistivity zone
Under plus the factor；
Multiply the factor accordingly and add factor calculation formula are as follows:
Wherein:
It repeats the above steps, up to the view of each electrode measurement of borehole wall micro-resisitivity image instrument under all testing resistance rates
Resistivity and the functional relation of true resistivity all establish completion；
The above functional relation is merged, scale function group is formed:
Wherein,
After completing borehole wall micro-resisitivity image instrument scale, carried out using borehole wall micro-resisitivity image instrument
It is directly true formation resistivity numerical value by the apparent resistivity numerical scale of measurement by scale function group when well logging.
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Cited By (3)
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| CN111239849A (en) * | 2020-02-10 | 2020-06-05 | 东北石油大学 | Reservoir fracture prediction method and prediction system based on stress release |
| CN111550237A (en) * | 2020-04-02 | 2020-08-18 | 中国海洋石油集团有限公司 | Method for measuring real resistivity of flushing zone and electric imaging logging instrument |
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