CN106948807A - A kind of method to crossing acquisition and the correction of drilling rod logger depth - Google Patents
A kind of method to crossing acquisition and the correction of drilling rod logger depth Download PDFInfo
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/04—Measuring depth or liquid level
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Abstract
The step of drilling rod logging system depth being crossed the invention discloses one kind to obtain and bearing calibration, including rotating pulse signal is parsed into wirerope wheel disc Martin generation objective encoder output A, B phase signals；The step of forward and backward pulse signal of wheel disc rotating situation is counted and recorded；The step of correction of wheel mill damage, wirerope stretching correction and drilling tool length correction are carried out to count value；And according to the step of the actual depth value of the count value calculating after correction.The present invention using this acquisitions and correction calculation method can obtain it is more accurate cross drilling rod depth-logger value, and then support is provided for the accurate petroleum exploration logging data of acquisition, to meet current drilling rod instrument logging operation requirement well.
Description
Technical field
The invention belongs to oil exploration technology field, and in particular to a kind of acquisition and school to crossing drilling rod logger depth
Positive method.
Background technology
Petroleum well logging technology is a key areas of petroleum industry technology, includes logging method, logger equipment
With the research direction of three interdependences such as the processing to well-log information.Logging technique originates from France Si Lunbeixie in nineteen twenty-seven
Company, nineteen thirty-nine, China started logging technique being applied to petroleum industry.Over more than 70 years, logging technique experienced from modeling logging
To digital logging, Sub-system in Computerized Logging System, imaging logging development course, one of ten big oil subjects are had evolved at present, with stone
The increasing of exploration activity difficulty, High angle and ultradeep well are more and more, and casing programme is complicated, and borehole condition is poor, conventional at present to survey
Well can not meet requirement, and these problems can be solved by crossing drilling rod logging instrument, and its operation principle is that logger string is put into brill
In the hydrophthalmia of bar, instrument is pulled using the steel wire rope that entrance is bypassed from drilling rod, is logged well during drilling rod draws and carried；The well logging side
Formula construction technology is simple, it is not necessary to powered by live electric cable to instrument, safe, greatly shorten obtain log data when
Between.
The whether accurate correctness for being directly connected to log data of depth survey.Current conventional depth measurement is only pressed
According to wirerope Martin for the A of encoder wheel output, B-phase orthogonal pulses signal on passenger steamer disk, surveyed by calculating umber of pulse
The decentralization depth of well instrument, without by A, the filtering of B-phase signal, error condition and wirerope pulling force, wirerope stretching, wirerope wheel
Mill damage situation, drilling rod motion etc. factor take into account, therefore, the depth-logger value thus calculated is clearly inaccurate
, so that the accuracy of log data is received and had a strong impact on.
The content of the invention
(1) technical problem solved
In view of the shortcomings of the prior art, the invention provides a kind of acquisition and correction to crossing drilling rod logger depth
Method, takes into full account the situation of influence measurement structure so that the depth value of acquisition is more accurate.
(2) technical scheme
To realize object above, the present invention is achieved by the following technical programs：
One kind is crossed drilling rod logging system depth and obtained and bearing calibration, including drilling rod logger, depth survey are crossed in underground
Underground is crossed drilling rod logger by the wirerope wound on its wirerope wheel disc and is put into underground by instrument and logging truck, the logging truck,
The encoder set on wheel disc exports orthogonal differential A, B signal, the depth calibrator according to the rotating situation of wirerope wheel disc
Receive the A of encoder output, B signal to be parsed, be parsed into the forward and backward pulse signal of wirerope wheel disc and counted respectively
Number；
Preferably, the bearing calibration performs following depth value aligning step：
A, calculating wirerope wheel mill damage correction factor enc_corfac：
Enc_corfac=1000.0/enc_rawdepth；
Enc_rawdepth=enc_rawcnt/fscale；
Wherein, when fscale is that wirerope wheel disc rotates 1 meter of length, the theoretical umber of pulse of encoder output, enc_rawcnt
The difference of forward and backward counted number of pulses during for 1000 meters of the actual walking of wirerope after encoder output parsing；
B, calculating wirerope stretching correction lsxz：
Lsxz=freelen* ((0.5*freelen*k2)+k1)；
K1=dev_w_mud*ls_k；
K2=steelwire_w_k*ls_k；
Wherein, the counted number of pulses that freelen exports for the encoder corresponding to the length of current undeformed wirerope；dev_
W_mud is by hanging weight of the downhole logging instruments in down-hole slurry on wirerope；Steelwire_w_k is underground wirerope weight school
Positive coefficient；Ls_k is wirerope drawing coefficient；
C, calculating CD value enc_corr_depth：
Enc_corr_depth=(depth_lpjz+lsxz)/fscale；
Depth_lpjz=depth_rawcnt*enc_corfac；
Wherein, depth_rawcnt is the difference of rotating forward counted number of pulses and inversion pulse count value that current encoder is exported
Value；
Depth value corrected_depth after d, calculating drilling tool correction：
Corrected_depth=(drill_depthn-drill_depthn-1)/(enc_corr_depthn-enc_
corr_depthn-1)*enc_corr_depth+[drill_depthn-(drill_depthn-drill_depthn-1)/(enc_
corr_depthn-enc_corr_depthn-1)*enc_corr_depthn]；
Wherein, drill_depthnThe current depth inputted after chuck according to BHA table is put for this drilling rod,
drill_depthn-1The depth inputted after chuck according to BHA table is put for last time drilling rod；enc_corr_depthnFor this
Drilling rod puts the depth calculated after chuck, drill_depthn-1The depth calculated after chuck is put for last time drilling rod；
E, valid data extraction
To detect decline displacement it is cumulative after subtract decline displacement and add up, you can reject invalid data and obtain depth value.
It is preferred that, the freelen is calculated by below equation and obtained：
Freelen=depth_lpjz-ls_k* ∑s ((Δ depth) * tension)；
Wherein, ls_k is wirerope drawing coefficient；Δ depth is the step-by-step counting value changes that unit time interior coding wheel is exported
Amount, and ∑ (Δ depth)=depth_lpjz, tension are the pulling force on the unit interval wirerope.
It is preferred that, the pulling force of the wirerope is surveyed by tensometer sampling output to the described depth being arranged on wirerope wheel disc
Measure instrument.
It is preferred that, the dev_w_mud is calculated by below equation and obtained：
Dev_w_mud=dev_w_air- (dev_volume*mud_weight)；
Wherein, dev_w_air crosses the aerial weight of drilling rod logger for underground, and dev_volume is underground logging
The volume of instrument, mud_weight is the mud weight of underground unit volume.
It is preferred that, the underground wirerope weight correction coefficient steelwire_w_k is calculated by below equation and obtained：
Steelwire_w_k=(steelwire_w_mud/fscale)/1000；
Steelwire_w_mud=steelwire_w_air- (steelwire_volume*mud_weight)；
Wherein, steelwire_w_air is 1000 meters of aerial weight of wirerope, and steelwire_volume is 1000
The volume of rice wirerope, mud_weight is the mud weight of underground unit volume.
It is preferred that, photoelectric encoder is used inside the code wheel, the motion of wirerope wheel disc drives encoder rotation to cause
Photoelectric encoder exports A, B phase differential signal；Parsed after A, B phase differential signal is converted into single-ended A, B phase signals,
If advanced 90 degree of the B phases of A phases, then it represents that wirerope wheel disc is rotated forward, and output rotates forward pulse signal；If advanced 90 degree of the A phases of B phases, then it represents that
Wirerope wheel disc is inverted, and exports inversion pulse signal.
It is preferred that, A, B phase differential signal that the photoelectric encoder is exported are converted to single-ended through differential signal receiving circuit
A, B phase signals；Wherein, A phase signals are transmitted separately to first input end and the second clock end of a bistable d flip-flop, and B believes
Number it is transmitted separately to the second input and the first clock end of the bistable d flip-flop；Pass through the bistable d flip-flop
The pulse signal of first output end output is carried out with after computing, exporting inversion pulse signal with A, B phase signals；By described
The pulse signal of the second output end output of flip and flop generator is carried out with after computing, exporting and rotating forward arteries and veins with A, B phase signals
Rush signal.
(3) beneficial effect
The present invention's crosses drilling rod logging system depth correction computational methods pulse signal of code wheel output on wheel disc
The abrasion correction, wirerope stretching correction and drilling tool length correction of wirerope wheel disc are carried out on the basis of count value, and rejects invalid
Depth data.So as to obtain the more accurate depth value for crossing drilling rod logger, and then to obtain accurately well logging number
According to there is provided support, current drilling rod instrument logging operation requirement excessively can be met well.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the flow chart for crossing the acquisition of drilling rod logging system depth and correction calculation method proposed by the invention；
Fig. 2 is the schematic block circuit diagram that the sampled signal for exporting encoder is converted to forward and backward pulse signal；
Fig. 3 is code wheel A, B phase signals parser circuitry in Fig. 2；
Fig. 4 is that valid data extract schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
A part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
As described in Fig. 1-4, one kind is crossed drilling rod logging system depth and obtained and bearing calibration, including drilling rod logging instrument is crossed in underground
Underground is crossed drilling rod logger by the wirerope wound on its wirerope wheel disc and put by device, depth calibrator and logging truck, logging truck
Enter the encoder set on underground, wheel disc and orthogonal differential A, B signal, depth survey are exported according to the rotating situation of wirerope wheel disc
Instrument receives the A of encoder output, B signal and parsed, and is parsed into the forward and backward pulse signal of wirerope wheel disc and is counted respectively
Number.
Wherein, following depth value aligning step is performed：
A, calculating wirerope wheel mill damage correction factor enc_corfac：
Enc_corfac=1000.0/enc_rawdepth；
Enc_rawdepth=enc_rawcnt/fscale；
Wherein, when fscale is that wirerope wheel disc rotates 1 meter of length, the theoretical umber of pulse of encoder output, enc_rawcnt
The difference of forward and backward counted number of pulses during for 1000 meters of the actual walking of wirerope after encoder output parsing；
B, calculating wirerope stretching correction lsxz：
Lsxz=freelen* ((0.5*freelen*k2)+k1)；
K1=dev_w_mud*ls_k；
K2=steelwire_w_k*ls_k；
Wherein, freelen is the counted number of pulses of the encoder output corresponding to the length of current undeformed wirerope, dev_
W_mud is by hanging weight of the downhole logging instruments in down-hole slurry on wirerope, steelwire_w_k is underground wirerope weight school
Positive coefficient, ls_k is wirerope drawing coefficient；
C, calculating CD value enc_corr_depth：
Enc_corr_depth=(depth_lpjz+lsxz)/fscale；
Depth_lpjz=depth_rawcnt*enc_corfac；
Wherein, depth_rawcnt is the difference of rotating forward counted number of pulses and inversion pulse count value that current encoder is exported
Value；
Depth value corrected_depth after d, calculating drilling tool correction：
Corrected_depth=(drill_depthn-drill_depthn-1)/
(enc_corr_depthn-enc_corr_depthn-1)*enc_corr_depth+[drill_depthn-(d
rill_depthn-drill_depthn-1)/(enc_corr_depthn-enc_corr_depthn-1)*enc_co
rr_depthn]；
Wherein, drill_depthnThe current depth inputted after chuck according to BHA table is put for this drilling rod,
drill_depthn-1The depth inputted after chuck according to BHA table, enc_corr_depth are put for last time drilling rodnFor this
Drilling rod puts the depth calculated after chuck, drill_depthn-1The depth calculated after chuck is put for last time drilling rod；
E, valid data extraction
To detect decline displacement it is cumulative after subtract rising displacement and add up, you can reject invalid data and obtain depth value.
Wherein, freelen is calculated by below equation and obtained：
Freelen=depth_lpjz-ls_k* ∑s ((Δ depth) * tension)；
Wherein, ls_k is wirerope drawing coefficient, and Δ depth is the step-by-step counting value changes that unit time interior coding wheel is exported
Amount, and ∑ (Δ depth)=depth_lpjz, tension are the pulling force on the unit interval wirerope.
Wherein, the pulling force of wirerope is exported to described depth calibrator by the tensometer sampling being arranged on wirerope wheel disc.
Wherein, dev_w_mud is calculated by below equation and obtained：
Dev_w_mud=dev_w_air- (dev_volume*mud_weight)；
Wherein, dev_w_air crosses the aerial weight of drilling rod logger for underground, and dev_volume is underground logging
The volume of instrument, mud_weight is the mud weight of underground unit volume.
Wherein, underground wirerope weight correction coefficient steelwire_w_k is calculated by below equation and obtained：
Steelwire_w_k=(steelwire_w_mud/fscale)/1000；
Steelwire_w_mud=steelwire_w_air- (steelwire_volume*mud_weight)；
Wherein, steelwire_w_air is 1000 meters of aerial weight of wirerope, and steelwire_volume is 1000
The volume of rice wirerope, mud_weight is the mud weight of underground unit volume.
Wherein, photoelectric encoder is used inside code wheel, the motion of wirerope wheel disc drives encoder rotation to cause photoelectricity to be compiled
Code device output A, B phase differential signal；Parsed after A, B phase differential signal is converted into single-ended A, B phase signals, if A phases
Advanced 90 degree of B phases, then it represents that wirerope wheel disc is rotated forward, and output rotates forward pulse signal；If advanced 90 degree of the A phases of B phases, then it represents that wirerope wheel
Disk is inverted, and exports inversion pulse signal.
Wherein, A, B phase differential signal of photoelectric encoder output are converted to single-ended A, B through differential signal receiving circuit and believed
Number；Wherein, A phase signals are transmitted separately to first input end and the second clock end of a bistable d flip-flop, B phase signals difference
Transmit to the second input of the bistable d flip-flop and the first clock end；It is defeated by the first of the bistable d flip-flop
The pulse signal and A, B phase signals for going out end output are carried out with after computing, exporting inversion pulse signal；Pass through the bistable state
The pulse signal of the second output end output of trigger is carried out with after computing, exporting and rotating forward pulse signal with A, B phase signals
The acquisition for crossing drilling rod logging system Instrumental depth is elaborated below by a specific embodiment
And correction calculation method, and for performing the specific establishment that the depth-logger obtains the depth calibrator of correction calculation method
Structure.
Embodiment one, shown in Figure 1, the depth-logger correction calculation method of the present embodiment comprises the following steps：
Encoder is exported on S101, collection wirerope wheel disc the signal and the parsing that are used to reflect wheel disc motion conditions；
In the present embodiment, code wheel detects rotation distance and the direction of wirerope wheel disc using photoelectric encoder, i.e., by
The motion of wirerope wheel disc drives code wheel to rotate, to cause photoelectric encoder to export sampled signal.Due to photoelectric encoder output
Signal be usually differential signal, and including A, B two-phase, it is therefore desirable to A, B phase differential signal is changed, parsed,
After processing, required forward and backward pulse signal could be generated.Specifically, it should first turn A, B phase differential signal
Single-ended A, B phase signals are changed to, are then parsed, if advanced 90 degree of the B phases of A phases, then it represents that wheel disc is rotated forward, and output rotates forward pulse letter
Number；If conversely, advanced 90 degree of the A phases of B phases, then it represents that wheel disc is inverted, and exports inversion pulse signal.
The present embodiment is turned using special hardware circuit come original A, B phase differential signal exported to photoelectric encoder
Change, dissection process, to decomposite independent forward and backward pulse signal, for depth-logger value correction calculate.Specifically,
A, B phase differential signal ENC A+/ENC A-, ENC B+/ENC B- that photoelectric encoder is exported are transmitted to a difference first and believed
Number receiving circuit, to change single-ended A, B phase signals of generation；Code wheel A, B phase signals parser circuitry is then transmit to, to parse life
Cheng represents the rotating forward pulse signal UP of wirerope wheel disc rotating forward and represents the inversion pulse signal DOWN of wirerope wheel disc reversion, referring to figure
Shown in 2.Differential signal receiving circuit and encoder A, B phase signals parser circuitry can be specifically located in depth calibrator
In the depth in portion/tension force module.Wherein, encoder A, B phase signals parser circuitry can be used in the depth/tension force module
Large-scale digital ic FPGA design is realized.
Fig. 3 is a kind of hardware design scheme of encoder A, B phase signals parser circuitry, including the triggering of bistable state
Device DFLIP-FLOPS and two and door AND1, AND2.Wherein, the A phase signals exported by differential signal receiving circuit are passed respectively
The first input end 1D and second clock end 2CLK, B phase signals for transporting to the flip and flop generator DFLIP-FLOPS are transmitted respectively
To the second input 2D and the first clock end 1CLK of the flip and flop generator DFLIP-FLOPS.It is described to lead to door AND1
The pulse signal for crossing the first output end 1QN outputs of the flip and flop generator DFLIP-FLOPS enters with described A, B phase signals
Row is with after computing, exporting inversion pulse signal DOWN；With door AND2 by A, B phase signals with passing through the flip and flop generator
The pulse signal of DFLIP-FLOPS the second output end 2QN outputs is carried out with after computing, exporting and rotating forward pulse signal UP, thus
Just the output of the parsing to photoelectric encoder output signal is realized.
Certainly, if directly detecting turning for wirerope wheel disc using the code wheel with forward and backward output of pulse signal function
Dynamic distance, then can save conversion above, resolving.
S102, count respectively to rotating forward pulse signal and inversion pulse signal, and recording gauge numerical value；
In the present embodiment, it is possible to specifically using the Micro-processor MCV in depth calibrator or the hardware meter in FPGA
Device is aligned number, inversion pulse signal is counted respectively.Fig. 2 is to carry out forward and backward step-by-step counting using 16 digit counters in FPGA
Circuit design principle figure.
S103, the obtained count values of step S102 are corrected；
The present embodiment is according in the size of wheel disc and the parameter of photoelectric encoder and the current wirerope weight of combination, wirerope
The factors such as mud weight, wirerope wheel mill damage in tension force, oil well are corrected, and calculate the count value after correction.Its is main
Correction calculation process is as follows：
1. wirerope wheel mill damage is corrected：
Due to the abrasion that the manufacturing process and wirerope wheel disc of wirerope wheel disc are produced in use, wirerope wheel disc can be made
Girth changes.That is, the wirerope length that wirerope wheel disc rotates one week can be inconsistent with theoretical value, accordingly, it would be desirable to right
Theoretical value is modified.Its correction factor is：
Enc_corfac=1000.0/ (1000.0-wheel_calibration) (1)
Wherein, wheel_calibration was 1000 meters of wirerope motion criteria on drilling rod logging system wirerope wheel disc
When and by the difference between the theoretical value calculated according to the parameter of wirerope wheel disc size and code wheel.This value be usually by
Actual measurement is obtained, wherein, the code wheel reality output calculates value and can represented with enc_rawdepth, and
Enc_rawdepth=enc_rawcnt/fscale (2)
In formula (2), fscale be wirerope wheel disc rotate 1 meter of length when, the theoretical umber of pulse of encoder output, unit
For individual/rice；When enc_rawcnt is 1000 meters of the actual walking of wirerope, the AB phase signals of code wheel output parse after just,
The difference of inversion pulse count value.It can thus be appreciated that：Encoder_calibration=1000.0-enc_rawdepth, is substituted into public
Formula (1), can be reduced to by formula (1)：
Enc_corfac=1000.0/enc_rawdepth (3).
2. wirerope stretching correction：
Because when performing logging operation, wirerope needs to hang drilling rod logger excessively several tons heavy in vertical direction,
These weight can make it that wirerope deforms upon stretching, and wirerope own wt can also produce wirerope deformation in vertical direction, from
And the absolute depth position where causing downhole logging instruments changes.Therefore, it is necessary to caused by being stretched due to wirerope
Length change is taken into account, can just obtain downhole logging instruments it is more accurate, it is real where depth value.The stretching correction of its wirerope
Correction is：
Lsxz=freelen* ((0.5*freelen*k2)+k1) (4)
Wherein, the counted number of pulses that freelen exports for the encoder corresponding to the length of current undeformed wirerope.Due to
The power that wirerope wheel disc is subject to wirerope at wirerope contact point generates deformation so that wirerope wheel disc rotates length and is not equal to non-shape
Become the length of wirerope, therefore, it is necessary to which this partial deformation length is got rid of, can just obtain the length of undeformed wirerope, i.e.,
Freelen=depth_lpjz-ls_k* ∑s ((Δ depth) * tension) (5)
In formula (5), depth_lpjz obtains for the count value of present encoding wheel after the correction of wirerope wheel mill damage
Value, i.e. depth_lpjz=depth_rawcnt*enc_corfac；Wherein, depth_rawcnt be step S202 in count
The difference of the forward and backward counted number of pulses arrived.Ls_k is wirerope drawing coefficient, and connotation is on unit length wirerope plus 1 kilogram
The deformation length that wirerope is produced afterwards, the value is provided by production of steel producer or measured by experiment, and unit is rice/(meter per kilogram).
The counted number of pulses variable quantity that Δ depth exports for unit time interior coding wheel, and ∑ (Δ depth)=depth_lpjz；
Tension is the pulling force on wirerope in the unit interval, unit for kilogram.
Illustrate：If at the current wirerope descending T moment, are divided into N deciles, N is natural number, then during unit the T moment
Between t=T/N.It can thus be appreciated that：
Wherein, Δ depthiFor the counted number of pulses variable quantity of i-th of t time interior codings wheel output；tensioniFor i-th
Pulling force in the individual t times on wirerope.The wirerope pulling force can be sampled by the tensometer being arranged on wirerope wheel disc and be obtained.N is got over
Greatly, calculate more accurate.
In the present embodiment, k1, k2 in formula (4) can be calculated using below equation and obtained：
K1=dev_w_mud*ls_k (7)
K2=steelwire_w_k*ls_k (8)
In formula (7), dev_w_mud by hanging weight of the downhole logging instruments in down-hole slurry (liquid) on wirerope,
And
Dev_w_mud=dev_w_air- (dev_volume*mud_weight) (9)
Wherein, dev_w_air be the aerial weight of downhole logging instruments, unit for kilogram；Dev_volume is well
The volume of lower logger, unit is cubic meter；Mud_weight be underground unit volume mud weight, unit for kilogram/
Cubic meter.
In formula (8), steelwire_w_k is underground wirerope weight correction coefficient, i.e., underground wirerope is in down-hole slurry (liquid
Body) in code wheel export the wirerope weight of length corresponding to each pulse signal, i.e.,
Steelwire_w_k=(steelwire_w_mud/fscale)/1000 (10)
Steelwire_w_mud=steelwire_w_air- (steelwire_volume*mud_weight) (11)
In formula (11), steelwire_w_air is 1000 meters of aerial weight of wirerope；steelwire_volume
For the volume of 1000 meters of wireropes.
S104, calculating depth-logger value；
In the present embodiment, depth-logger value enc_corr_depth is calculated using below equation and obtained：
Enc_corr_depth=(depth_lpjz+lsxz)/fscale (12)
The depth-logger value that i.e. downhole logging instruments are presently in=by counted number of pulses/wirerope after step S103 corrections
The theoretical umber of pulse that code wheel is exported during the wirerope of wheel disc Moving Unit length.
Every drilling rod is put after chuck during to ensure to carry drilling rod on the accuracy of depth value, scene, according to BHA table
Input current depth is drill_depth, and the depth is further corrected to the depth calculated above drawn：corrected_
Depth=(drill_depthn-drill_depthn-1)/(enc_corr_depthn-enc_corr_depthn-1)*enc_
corr_depth+[drill_depthn-(drill_depthn-drill_depthn-1)/(enc_corr_depthn-enc_
corr_depthn-1)*enc_corr_depthn]；
Wherein, drill_depthnThe current depth inputted after chuck according to BHA table is put for this drilling rod；
drill_depthn-1The depth inputted after chuck according to BHA table is put for last time drilling rod；enc_corr_depthnFor this
Drilling rod puts the depth calculated after chuck, drill_depthn-1The depth calculated after chuck is put for last time drilling rod, according to every
One drilling rod calculates the depth after the instrumental correction in centre position as segmented node, segmentation.
Finally carry out the extraction of valid data, principle be will detect decline displacement it is cumulative after subtract rising displacement and tire out
Plus, such as Fig. 4, abscissa is the time, and unit is millisecond, and ordinate is depth, and unit is rice.Drilling rod moves up and down since A points
Repetition high point C, E and G points can be produced, software reduces direction using the time as with reference to extraction AB, CD, EF and GH respectively using depth
Duan Zuowei effective depths section, rejects invalid depth data.
The depth-logger value corrected_depth obtained is calculated by above-mentioned correction to log well closer to drilling rod excessively in oil well
Actual grade where instrument.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality
Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating
In any this actual relation or order.Moreover, term " comprising ", "comprising" or its any other variant are intended to
Nonexcludability is included, so that process, method, article or equipment including a series of key elements not only will including those
Element, but also other key elements including being not expressly set out, or also include being this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
The present invention is described in detail, it will be understood by those within the art that：It still can be to foregoing each implementation
Technical scheme described in example is modified, or carries out equivalent to which part technical characteristic；And these modification or
Replace, the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (8)
1. one kind is crossed drilling rod logging system depth and obtained and bearing calibration, including drilling rod logger, depth calibrator are crossed in underground
And logging truck, underground crossed drilling rod logger by the wirerope wound on its wirerope wheel disc and is put into underground by the logging truck, is taken turns
The encoder set on disk exports orthogonal differential A, B signal according to the rotating situation of wirerope wheel disc, it is characterised in that：The depth
Degree measuring instrument receives the A of encoder output, B signal and parsed, and is parsed into the forward and backward pulse signal and difference of wirerope wheel disc
Counted.
2. according to claim 1 cross drilling rod logging system depth acquisition methods, it is characterised in that：It is corrected, and holds
The following depth value aligning step of row：
A, calculating wirerope wheel mill damage correction factor enc_corfac：
Enc_corfac=1000.0/enc_rawdepth；
Enc_rawdepth=enc_rawcnt/fscale；
Wherein, when fscale is that wirerope wheel disc rotates 1 meter of length, the theoretical umber of pulse of encoder output, enc_rawcnt is steel
The difference of forward and backward counted number of pulses during 1000 meters of the actual walking of cable after encoder output parsing；
B, calculating wirerope stretching correction lsxz：
Lsxz=freelen* [(0.5*freelen*k2)+k1]；
K1=dev_w_mud*ls_k；
K2=steelwire_w_k*ls_k；
Wherein, freelen is the counted number of pulses of the encoder output corresponding to the length of current undeformed wirerope, dev_w_
Mud is by hanging weight of the downhole logging instruments in down-hole slurry on wirerope, steelwire_w_k corrects for underground wirerope weight
Coefficient, ls_k is wirerope drawing coefficient；
C, calculating CD value enc_corr_depth：
Enc_corr_depth=(depth_lpjz+lsxz)/fscale；
Depth_lpjz=depth_rawcnt*enc_corfac；
Wherein, depth_rawcnt is the difference of rotating forward counted number of pulses and inversion pulse count value that current encoder is exported；
Depth value corrected_depth after d, calculating drilling tool correction：
Corrected_depth=(drill_depthn-drill_depthn-1)/(enc_corr_depthn-enc_corr_
depthn-1)*enc_corr_depth+[drill_depthn-(drill_depthn-drill_depthn-1)/(enc_corr_
depthn-enc_corr_depthn-1)*enc_corr_depthn]；
Wherein, drill_depthnThe current depth inputted after chuck according to BHA table, drill_ are put for this drilling rod
depthn-1The depth inputted after chuck according to BHA table, enc_corr_depth are put for last time drilling rodnPut for this drilling rod
The depth calculated after chuck, drill_depthn-1The depth calculated after chuck is put for last time drilling rod；
E, valid data extraction
To detect decline displacement it is cumulative after subtract rising displacement and add up, you can reject invalid data and obtain depth value.
3. depth-logger correction calculation method according to claim 2, the freelen is calculated by below equation and obtained：
Freelen=depth_lpjz-ls_k* ∑s [(Δ depth) * tension]；
Wherein, ls_k is wirerope drawing coefficient, and Δ depth is the counted number of pulses variable quantity that unit time interior coding wheel is exported,
And ∑ (Δ depth)=depth_lpjz, tension are the pulling force on the unit interval wirerope.
4. depth-logger correction calculation method according to claim 3, the pulling force of the wirerope is by being arranged on wirerope wheel disc
On tensometer sampling output to described depth calibrator.
5. depth-logger correction calculation method according to claim 2, it is characterised in that：The dev_w_mud is by following
Formula, which is calculated, to be obtained：
Dev_w_mud=dev_w_air- (dev_volume*mud_weight)；
Wherein, dev_w_air crosses the aerial weight of drilling rod logger for underground, and dev_volume is downhole logging instruments
Volume, mud_weight be underground unit volume mud weight.
6. depth-logger correction calculation method according to claim 2, it is characterised in that：The underground wirerope weight correction
Coefficient steelwire_w_k is calculated by below equation and obtained：
Steelwire_w_k=(steelwire_w_mud/fscale)/1000；
Steelwire_w_mud=steelwire_w_air- (steelwire_volume*mud_weight；
Wherein, steelwire_w_air is 1000 meters of aerial weight of wirerope, and steelwire_volume is 1000 meters of steel
The volume of cable, mud_weight is the mud weight of underground unit volume.
7. depth-logger correction calculation method according to claim 1, it is characterised in that：Light is used inside the code wheel
Photoelectric coder, the motion of wirerope wheel disc drives encoder rotation to cause photoelectric encoder to export A, B phase differential signal；By the A,
B phase differential signals are parsed after being converted to single-ended A, B phase signals, if advanced 90 degree of the B phases of A phases, then it represents that wirerope wheel disc is rotated forward,
Output rotates forward pulse signal；If advanced 90 degree of the A phases of B phases, then it represents that wirerope wheel disc is inverted, and exports inversion pulse signal.
8. the depth-logger correction calculation method according to claim 1 or 7, it is characterised in that：Pass through the photoelectric coding
A, B phase differential signal of device output are converted to single-ended A, B phase signals through differential signal receiving circuit；Wherein, A phase signals are passed respectively
First input end and the second clock end of a bistable d flip-flop are transported to, B phase signals are transmitted separately to the bistable state D triggerings
Second input of device and the first clock end；The pulse signal exported by the first output end of the bistable d flip-flop with
A, B phase signals are carried out with after computing, exporting inversion pulse signal；It is defeated by the second output end of the flip and flop generator
The pulse signal gone out is carried out with after computing, exporting and rotating forward pulse signal with A, B phase signals.
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