CN103114844B - Instrument eccentricity correction method in horizontal well acoustic cement bond logging - Google Patents
Instrument eccentricity correction method in horizontal well acoustic cement bond logging Download PDFInfo
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Abstract
The invention relates to a method for correcting eccentricity influences of an acoustic cement bond logging instrument during horizontal well cementing quality evaluation in an oilfield development process. The method includes: utilizing acoustic amplitude differences of eight sectors caused by eccentricity in sector cement bond logging for computing eccentric distance in a bushing; utilizing relation of the eccentric distance and a 3ft acoustic amplitude for correcting the 3ft acoustic amplitude in an eccentric state to an amplitude in an instrument intermediate state; and recomputing a cement bond index for evaluating cementing quality. The method is capable of improving accuracy of horizontal well cementing quality evaluation, provides accurate technical data for perforation and fracturing, and meets requirements of horizontal well development.
Description
Technical field
The present invention relates in oilfield development process, when carrying out horizontal cementing quality evaluation, correcting a kind of method of acoustic cement bond log instrument Influence from Eccentric
Background technology
In oilfield development process, horizontal wells technology develops rapidly, but relatively lags behind as the horizontal cementing quality logging technique of supporting technology, still continues to use the logging technique being applicable to peupendicular hole and evaluates net horizontal section cementing quality.In peupendicular hole or low-angle inclined shaft, logger can ensure center condition, but in net horizontal section and high angle hole section, cause instrument eccentric at net horizontal section under gravity, instrument can not be placed in the middle in sleeve pipe, as shown in Figure 1, peupendicular hole cementing quality logging technique is made to occur at net horizontal section inadaptable.Theory analysis is thought, when instrument is eccentric, from well week, each wave train of reflected back towards receiver phase offset can occur, and the casing wave amplitude superposed out can reduce; The eccentric theory on the impact of casing wave of instrument and experimental result show, as shown in Figures 2 and 3, when instrument point source bias reaches 1/4in, casing wave amplitude can reduce nearly 50%; The eccentric impact on Borehole Acoustic Waves in instrumentation column source is comparatively large, and the theoretical casing wave amplitude that all shows with experiment reduces gradually with the increase of eccentric throw.And instrument bias causes the casing wave amplitude be recorded to reduce, cause Cementation Quality to evaluate the illusion of preference, and then affect effective execution of perforation, fracturing methods.Therefore, for ensureing the accuracy of horizontal cementing quality evaluation, must correct instrument Influence from Eccentric.
Summary of the invention
In order to the accuracy of well primary cement evaluation of improving the standard, for next step perforation, pressure break provide technical data accurately, meet the demand of horizontal well development, the invention provides a kind of horizontal well acoustic cement bond log Instrumental eccentric correction method.
Technical scheme of the present invention is: a kind of horizontal well acoustic cement bond log Instrumental eccentric correction method, is characterized in that comprising following steps:
1.. first set up computation model, by the log response of eight sector probes under the different eccentric throw of numerical simulation, under setting up different eccentric throw situation, be in the sound width response data of eight sectors of different orientations;
2.. eight sector labels are 1-8, and first defining No. 1 sector institute azimuthal is 0
0, according to angle between sector 45
0, converse other 7 sector institute azimuthal;
3.. in each group of sector response simulation data, find the acoustic amplitude corresponding to each azimuth respectively according to 8 azimuths, totally 23 groups, often organize 8 acoustic amplitudes;
4.. with 1
0for step-length, change the azimuth of No. 1 sector, and try to achieve other 7 sector institute azimuthal, repeat step 3, until the azimuth of No. 1 sector reaches 360
0, obtain 23 × 360 groups of simulated sound width data so altogether, often organize 8;
5.. from practical logging data, extract one group of eight sector sound width data of a depth point, totally 8, the sound width data that this group is extracted and 23 × 360 groups of simulated sound width data do respectively squared difference and, altogether 23 × 360 squared difference with;
6.. ask all squared difference and minimum value, the one group of simulated sound width data finding minimum value corresponding, this eccentric throw corresponding to group simulated sound width data is the instrument eccentric throw on required depth point;
7.. set up the Changing Pattern of 3ft acoustic amplitude with instrument eccentric throw by numerical simulation;
8.. the instrument eccentric throw utilizing step 6 to obtain, finds corresponding standardization acoustic amplitude in the Changing Pattern of the 3ft acoustic amplitude obtained in step 7 with instrument eccentric throw;
9.. extract the 3ft acoustic amplitude of these depth point practical logging data, and with the standardization acoustic amplitude that this value obtains divided by step 8, just obtain the 3ft acoustic amplitude after eccentric correction.
The invention has the beneficial effects as follows: the method is based on existing primary cement evaluation logger, without the need to developing new logger, without the need to changing existing construction technology and operational procedure, there is stronger implementation; The identification of instrument bias and correction have higher precision, eccentric throw inversion error is less than 1mm, amplitude correction error is less than 6.3%, the program code write according to eccentric correction method is embedded cementing quality interpretation software data processing module, data prediction can be realized, eccentric to identify and trimming process is one-touch completes, while not increasing explanation personnel burden, improve evaluation accuracy; In peupendicular hole section, instrument eccentric throw is 0, and casing wave correcting value is 0; In net horizontal section instrument eccentric throw between 4mm-20mm, 3ft sound width and cement bond index are corrected, and the means of interpretation based on eccentric correction not only can be used for peupendicular hole but also can be applicable to horizontal well, has good universality.
Utilize the method, in horizontal cementing quality Well Data Processing, when being logged well by horizontal segment exactly, the eccentric distance of instrument detects continuously, and correct 3ft sound width and cement bond index according to eccentric distance, ensure that the accuracy of primary cement evaluation, the formulation for the development stimulation such as horizontal well perforation, pressure break provides information accurately.
Accompanying drawing explanation
Fig. 1 is the eccentric state schematic diagram of logger when horizontal positioned;
Fig. 2 eccentric throw is theoretical and experimental result one schematic diagram to casing wave amplitude influences;
Fig. 3 eccentric throw is theoretical and experimental result two schematic diagram to casing wave amplitude influences;
Fig. 4 instrument bias well logging computation model schematic diagram;
Eight sector wave amplitude change schematic diagrames under the different eccentric throw of Fig. 5;
Fig. 6 3ft sound width is with the Changing Pattern schematic diagram of instrument eccentric distance;
Fig. 7 instrument eccentric correction flow chart;
The well logging of Fig. 8 Daqing oil field horizontal cementing quality is eccentric to be identified and corrects result.
10-stratum in figure, 11-cement layer, 12-sleeve pipe, 13-fluid, 14-logger, angle between θ-sector, dr-eccentric throw.
Detailed description of the invention
Below in conjunction with accompanying drawing, invention is described further:
As can be seen from Fig. 1 to Fig. 3, because instrument bias can produce a very large impact cement bond log data, thus the accurate evaluation of impact to cementing quality, so need to be corrected eccentric situation, the 3Ft acoustic amplitude logging curve affected without acceptance of persons.
The basis of this bearing calibration is sector cement bonding well-log information.Sector cement bond logging instrument is except 3ft and 5ft two kinds probe except possessing spacing, and spacing is the eight sectors probes of 2ft in addition, and this probe is divided into eight sectors in the circumferential, and each sector centers angle is 45
0, 8 sound width curves of the circumferential cementing status of reaction can be recorded.When instrument is eccentric, relative to situation placed in the middle, the sound width data of 8 sectors can produce difference because of each sector and the different of sleeve pipe spacing, utilize this species diversity just inverting can obtain the eccentric distance of instrument.Again by setting up the Changing Pattern of 3ft acoustic amplitude with instrument eccentric distance, just instrument eccentric correction can be realized.
Concrete implementation step is as shown in Fig. 4 to Fig. 8:
1.. first set up computation model as shown in Figure 4, in figure, 10 is stratum, 11 is cement layer, and 12 is sleeve pipe, and 13 is fluid, 14 is logger, θ is angle between sector, and dr is eccentric throw, by the log response of eight sector probes under the different eccentric throw of numerical simulation, be in the sound width response data of eight sectors of different orientations under can setting up different eccentric throw situation, see Fig. 5; Give 7 kinds of eccentric distances in Fig. 5, other integer eccentric throw response data between 0-22mm can be obtained by the method for interpolation, so have 23 groups of sector response simulation data;
2.. be 1-8 by eight sector labels in Fig. 4, first defining No. 1 sector institute azimuthal is 0
0, according to angle between sector
(θ is 45
0), other 7 sector institute azimuthal can be conversed;
3.. the acoustic amplitude corresponding to each azimuth can be found respectively according to 8 azimuths in each group of sector response simulation data, totally 23 groups, often organize 8 acoustic amplitudes;
4.. with 1
0for step-length, change the azimuth of No. 1 sector, and try to achieve other 7 sector institute azimuthal, repeat step 3, until the azimuth of No. 1 sector reaches 360
0, 23 × 360 groups of simulated sound width data can be obtained so altogether, often organize 8;
5.. from practical logging data, extract one group of eight sector sound width data of a depth point, totally 8, the sound width data that this group is extracted and 23 × 360 groups of simulated sound width data do respectively squared difference and, altogether 23 × 360 squared difference with;
6.. ask all squared difference and minimum value, the one group of analogue data finding minimum value corresponding, this eccentric throw corresponding to group analogue data is the instrument eccentric throw on required depth point;
7.. set up the Changing Pattern figure of 3ft acoustic amplitude with instrument eccentric throw by numerical simulation, as shown in Figure 6, this Changing Pattern is through experimental verification;
8.. utilize the eccentric throw that step 6 obtains, in the Changing Pattern of the 3ft acoustic amplitude obtained in step 7 with instrument eccentric throw, find corresponding standardization acoustic amplitude;
9.. extract the 3ft acoustic amplitude of these depth point practical logging data, and with the standardization acoustic amplitude that this value obtains divided by step 8, just obtain the 3ft acoustic amplitude after eccentric correction;
10.. well section each depth point Data duplication above-mentioned steps is corrected to needs, realizes the eccentric correction to 3ft sound width curve, calculate cement bond index to horizontal cementing quality evaluation according to 3ft acoustic amplitude.
Above-mentioned physical simulation computational process as shown in Figure 7.
In the method proof procedure, on-the-spot application 86 mouthfuls of wells, horizontal cementing quality evaluation technology achieves the cementing quality fine evaluation under instrument eccentric state, the wound output value 1,505 ten thousand yuan.Horizontal well development engineer, doing in every mouthful of staged fracturing of horizontal well design, arranges fractured interval according to primary cement evaluation result, comprises pressure break position and interlayer length; Statistics 62703m primary cement evaluation well segment table is bright, and cement well section and account for 46.8%, medium 41.3%, differ from 11.9%, be starkly lower than peupendicular hole, this invention facilitates horizontal well completion and development technique is supporting.
Fig. 8 is bias identification in the quality evaluation of Daqing oil field horizontal cementing and corrects result, as can be seen from the figure, the non-timing of instrument bias, the illusion cemented can be caused, after correction, the former explanation of part cements well section and is evaluated as cementing medium, and it is cementing difference that the cementing medium well section of part evaluates convergence, and eccentric correction makes that primary cement evaluation is more strict, result is more accurate.
Claims (1)
1. a horizontal well acoustic cement bond log Instrumental eccentric correction method, is characterized in that comprising following steps:
1.. first set up computation model, by the log response of eight sector probes under the different eccentric throw of numerical simulation, under setting up different eccentric throw situation, be in the sound width response data of eight sectors of different orientations;
2.. eight sector labels are 1-8, and first defining No. 1 sector institute azimuthal is 0
0, according to angle between sector 45
0, converse other 7 sector institute azimuthal;
3.. in each group of sector response simulation data, find the acoustic amplitude corresponding to each azimuth respectively according to 8 azimuths, totally 23 groups, often organize 8 acoustic amplitudes;
4.. with 1
0for step-length, change the azimuth of No. 1 sector, and try to achieve other 7 sector institute azimuthal, repeat step 3, until the azimuth of No. 1 sector reaches 360
0, obtain 23 × 360 groups of simulated sound width data so altogether, often organize 8;
5.. from practical logging data, extract one group of eight sector sound width data of a depth point, totally 8, the sound width data that this group is extracted and 23 × 360 groups of simulated sound width data do respectively squared difference and, altogether 23 × 360 squared difference with;
6.. ask all squared difference and minimum value, the one group of simulated sound width data finding minimum value corresponding, this eccentric throw corresponding to group simulated sound width data is the instrument eccentric throw on required depth point;
7.. set up the Changing Pattern of 3ft acoustic amplitude with instrument eccentric throw by numerical simulation;
8.. the instrument eccentric throw utilizing step 6 to obtain, finds corresponding standardization acoustic amplitude in the Changing Pattern of the 3ft sound width obtained in step 7 with instrument eccentric throw;
9.. extract the 3ft acoustic amplitude of these depth point practical logging data, and with the standardization acoustic amplitude that this value obtains divided by step 8, just obtain the 3ft acoustic amplitude after eccentric correction.
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| CN104790939B (en) * | 2015-02-10 | 2018-03-23 | 中国海洋石油总公司 | A kind of method and apparatus for obtaining cementing rate |
| GB2585328B (en) * | 2018-12-14 | 2021-07-21 | Darkvision Tech Inc | Correcting for eccentricity of acoustic sensors in wells and pipes |
| CN112001095B (en) * | 2020-09-09 | 2023-08-04 | 中国石油化工集团有限公司 | Method for establishing well cementation quality evaluation index and well cementation quality evaluation method |
| CN111980676B (en) * | 2020-09-15 | 2023-11-03 | 中国石油大学(华东) | Method and processing device for evaluating well cementation quality by array acoustic logging |
| CN115992692B (en) * | 2023-03-23 | 2023-06-27 | 中海油田服务股份有限公司 | Cement ring thickness measuring method and device, electronic equipment and storage medium |
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Inventor after: Liu Jisheng Inventor after: Feng Yu Inventor after: Zeng Guihong Inventor after: Xiao Yong Inventor after: Dong Lanfang Inventor before: Liu Jisheng Inventor before: Feng Yu Inventor before: Zeng Guihong Inventor before: Dong Lanfang |
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