CN104747178B - A kind of method and apparatus for obtaining acoustic impedance - Google Patents
A kind of method and apparatus for obtaining acoustic impedance Download PDFInfo
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- CN104747178B CN104747178B CN201510069947.2A CN201510069947A CN104747178B CN 104747178 B CN104747178 B CN 104747178B CN 201510069947 A CN201510069947 A CN 201510069947A CN 104747178 B CN104747178 B CN 104747178B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000004568 cement Substances 0.000 claims description 21
- 238000011156 evaluation Methods 0.000 claims description 17
- 239000007787 solid Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000012530 fluid Substances 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004445 quantitative analysis Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004451 qualitative analysis Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- E21B47/12—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
- E21B47/14—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 using acoustic waves
-
- 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
- E21B47/005—Monitoring or checking of cementation quality or level
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Quality & Reliability (AREA)
- Acoustics & Sound (AREA)
- Remote Sensing (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a kind of method and apparatus for obtaining acoustic impedance, including：The steady component of resonance zone is obtained from the echo of sampled point；The steady component of the resonance zone of acquisition is divided into two or more regions；The acoustic impedance according to corresponding to the resonance wave in each region calculates each region；The acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to each region.Pass through the solution of the present invention, the steady component of resonance zone in echo is divided into multiple regions, the acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to multiple regions, because the back wave that the steady component of resonance zone includes is less, so as to improve the precision of acoustic impedance.
Description
Technical field
The present invention relates to logging technique, espespecially a kind of method and apparatus for obtaining acoustic impedance.
Background technology
Primary cement evaluation is mainly evaluated cement sheath bonding quality, i.e., to the boundary between sleeve pipe and cement sheath
The cementing situation at the interface between face, cement sheath and stratum is evaluated.Conventional sound is mainly applied in primary cement evaluation at present
Logging method.From the fifties in last century so far, logging community successively develops such as acoustic amplitude log tools (CBL, Cement Bond
Log), variable density log instrument (VDL, Variable Density Log), the patch borehole wall divide sector cement bonding evaluation logging instrument etc.
A variety of loggers for primary cement evaluation, but these instruments utilize Conventional sound method between sleeve pipe and cement sheath
The cementing situation that interface carries out the interface between semi-quantitative assessment, cement sheath and stratum carries out qualitative analysis, can not be to cement
The cementing situation of ring carries out accurate quantitative assessment.This wheel shellfish thank (Schlumberger) company ultrasonic imaging device (USIT,
Ultralsonic Imager Tool), Haliburton (Halliburton) company well week ultra sonic scanner instrument (CAST-V,
Circumferential Acoustic Scanner Tool) and CNOOC clothes multifunctional ultrasonic imaging logging instrument (MUIL,
Multifunction Ultrasonic Imaging Logging Tool) well logging of impulse ultrasound echo-wave imaging is belonged to, can be right
The cementing situation at the interface between sleeve pipe and cement sheath carries out quantitative analysis evaluation.
The pass of quantitative analysis evaluation is being carried out to the cementing situation at the interface between sleeve pipe and cement sheath using above-mentioned instrument
Key technology is the acoustic impedance that material outside sleeve pipe is asked for echo.The existing method for obtaining acoustic impedance generally comprises：According to formula
(1) calculated.
Wherein, Z is the acoustic impedance of the outer material sampled point of sleeve pipe, and H is the thickness of sleeve pipe, and b1 is certain in the echo of sampled point
Ratio between the resonance wave amplitude in one region and reflection wave amplitude, B1 be reference point echo in the same area resonance wave amplitude
Ratio between degree and reflection wave amplitude.
Wherein, reference point refers to the point on free pipe corresponding with sampled point, and free pipe refers to no cement sheath
Sleeve pipe.
Generally, 0-15us is reflector space in echo, and 15us-30us is resonance zone, can be from this 2 regions
Extract back wave, the range value of resonance wave.
In the existing method for obtaining acoustic impedance, the resonance wave duration is fixed and only continues time domain resonance wave to this
The acoustic impedance of the outer material sampled point of sleeve pipe is calculated in row analysis, ignores other ripple signals (for example, back wave) and is superimposed upon altogether
Influence on vibrating wave signal.It is no pure resonance in the wave train is surveyed in fact, due to being influenceed by multicast medium
Existing for ripple, in different resonance zones, resonance wave is also disturbed by different degrees of back wave and other miscellaneous signals.Simultaneously
Even simple resonance wave, its wave-shape amplitude changes also with time difference, therefore, the precision of the acoustic impedance of acquisition compared with
It is low.
The content of the invention
In order to solve the above problems, the present invention proposes a kind of method and apparatus for obtaining acoustic impedance, it is possible to increase acoustic resistance
Anti- precision.
In order to achieve the above object, the present invention proposes a kind of method for obtaining acoustic impedance, including：
The steady component of resonance zone is obtained from the echo of sampled point；
The steady component of the resonance zone of acquisition is divided into two or more regions；
The acoustic impedance according to corresponding to the resonance wave in each region calculates each region；
The acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to each region.
Preferably, this method also includes：
According to the acoustic impedance evaluating cementing quality of the sampled point.
Preferably, when the acoustic impedance for judging the sampled point is less than the first predetermined threshold value, this method also includes：
The acoustic impedance difference of the sampled point is obtained according to the acoustic impedance of the sampled point；
The acoustic impedance difference for judging to obtain is more than or equal to the second predetermined threshold value, according to the acoustic impedance difference of the acquisition
Evaluate the cementing quality of the sampled point.
Preferably, the acoustic impedance difference that sampled point is obtained according to the acoustic impedance of sampled point includes：
According to formulaCalculate the acoustic impedance difference of the sampled point；
Wherein, PdFor the acoustic impedance difference of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions,
Z0iFor benchmark acoustic impedance corresponding to ith zone.
Preferably, the resonance wave according to each region calculate each region corresponding to acoustic impedance include：
According to formulaCalculate acoustic impedance corresponding to ith zone.
Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is the resonance wave amplitude and reflection wave amplitude of ith zone
Between ratio, B2 be reference point echo in intermediate region resonance wave amplitude and reflect wave amplitude between ratio.
Preferably, the acoustic impedance of the calculating of the acoustic impedance according to corresponding to each region sampled point includes：
According to formulaCalculate the acoustic impedance of the sampled point；
Wherein, ZpFor the acoustic impedance of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
The invention also provides a kind of device for obtaining acoustic impedance, comprise at least：
Acquisition module, for obtaining the steady component of resonance zone from the echo of sampled point；
Division module, for the steady component of the resonance zone of acquisition to be divided into two or more regions；
First computing module, for acoustic impedance corresponding to calculating each region according to the resonance wave in each region；
Second computing module, the acoustic impedance of sampled point is calculated for the acoustic impedance according to corresponding to each region.
Preferably, in addition to：
First evaluation module, for the acoustic impedance evaluating cementing quality according to the sampled point.
Preferably, in addition to：
Second evaluation module, for judging that the acoustic impedance of the sampled point is less than the first predetermined threshold value, adopted according to described
The acoustic impedance of sampling point obtains the acoustic impedance difference of the sampled point；It is pre- that the acoustic impedance difference for judging to obtain is more than or equal to second
If threshold value, the cementing quality of the sampled point is evaluated according to the acoustic impedance difference of the acquisition.
Preferably, second evaluation module is specifically used for：
Judge that the acoustic impedance of the sampled point is less than the first predetermined threshold value, according to formulaCalculate
The acoustic impedance difference of the sampled point；Wherein, PdFor the acoustic impedance difference of the sampled point, ZiFor acoustic resistance corresponding to ith zone
Anti-, N is number of regions, Z0iFor benchmark acoustic impedance corresponding to ith zone；The acoustic impedance difference for judging to obtain is more than or equal to the
Two predetermined threshold values, the cementing quality of the sampled point is evaluated according to the acoustic impedance difference of the acquisition.
Preferably, first computing module is specifically used for：
According to formulaCalculate acoustic impedance corresponding to ith zone.
Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is the resonance wave amplitude and reflection wave amplitude of ith zone
Between ratio, B2 be reference point echo in intermediate region resonance wave amplitude and reflect wave amplitude between ratio.
Preferably, second computing module is specifically used for：
According to formulaCalculate the acoustic impedance of the sampled point；
Wherein, ZpFor the acoustic impedance of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
Compared with prior art, the present invention includes：The steady component of resonance zone is obtained from the echo of sampled point；It will obtain
The steady component of the resonance zone obtained is divided into two or more regions；Each area is calculated according to the resonance wave in each region
Acoustic impedance corresponding to domain；The acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to each region.By the solution of the present invention, will return
The steady component of resonance zone in ripple is divided into multiple regions, and sampled point is calculated according to acoustic impedance corresponding to multiple regions
Acoustic impedance, because the back wave that the steady component of resonance zone includes is less, so as to improve the precision of acoustic impedance.
Brief description of the drawings
The accompanying drawing in the embodiment of the present invention is illustrated below, the accompanying drawing in embodiment is for entering one to the present invention
Step understands, is used to explain the present invention together with specification, does not form limiting the scope of the invention.
Fig. 1 is the flow chart for the method that the present invention obtains acoustic impedance；
Fig. 2 is the schematic diagram for the echo that present invention detection obtains；
Fig. 3 is the acoustic impedance curve synoptic diagram that the present invention is calculated using the method for existing method and the present invention；
Fig. 4 is the structure composition schematic diagram for the device that the present invention obtains acoustic impedance.
Embodiment
For the ease of the understanding of those skilled in the art, the invention will be further described below in conjunction with the accompanying drawings, not
It can be used for limiting the scope of the invention.It should be noted that in the case where not conflicting, embodiment and reality in the application
The various modes applied in example can be mutually combined.
Referring to Fig. 1, the present invention proposes a kind of method for obtaining acoustic impedance, including：
Step 100, from the echo of sampled point obtain resonance zone steady component.
In this step, echo can be detected to obtain by impulse ultrasound echo logger.Specifically, in the middle part of sleeve pipe
Transmitting probe excitation produces a ultrasonic pulse signal, and ultrasonic pulse signal is entered in sleeve pipe through fluid, most of sound
Wave energy is received after internal surface of sleeve pipe reflection by transducer, and remaining acoustic wave energy sleeve pipe, ultrasonic pulse signal is flowing
Interface between body-sleeve pipe, the interface between interface, cement sheath-stratum between sleeve pipe-cement sheath carry out multiple reflections,
Each interface, all there can be some energy to be reflected, some energy are transmitted, and the capacity of water of transmission depends on two kinds of material acoustic resistances
Anti- difference.Because the acoustic impedance of sleeve pipe and fluid is constant, so the ultrasonic pulse signal in sleeve pipe is with certain speed
Decay, acoustic impedance of the rate of decay dependent on set tube outside material.It is bigger to cover the acoustic impedance of tube outside material, the resonance in sleeve pipe
Wave amplitude is smaller；Conversely, the acoustic impedance of set tube outside material is smaller, the resonance wave amplitude in sleeve pipe is bigger.
In this step, resonance zone can be obtained from the echo of sampled point, is then obtained from the resonance zone obtained
Steady component.How the common knowledge that resonance zone belongs to those skilled in the art is obtained from sampled point echo, be not used to
Protection scope of the present invention is limited, is repeated no more here.
In this step, the steady component in resonance zone refers in resonance zone comprising the less part of back wave, can be with
The steady component in analysis determination resonance zone is carried out to experimental data, specific implementation belongs to the known normal of those skilled in the art
Know, the protection domain being not intended to limit the present invention, repeat no more here.
Step 101, the steady component of the resonance zone of acquisition is divided into two or more regions.
Step 102, the acoustic impedance according to corresponding to the resonance wave in each region calculates each region.
In this step, according to formulaCalculate acoustic impedance corresponding to ith zone.
Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is the resonance wave amplitude and reflection wave amplitude of ith zone
Between ratio, B2 be reference point echo in intermediate region resonance wave amplitude and reflect wave amplitude between ratio.
Wherein, intermediate region refers to be located at intermediate region on the time.For example, Fig. 2 is the schematic diagram for the echo that detection obtains.
As shown in Fig. 2 the steady component of resonance zone is divided into three regions, the duration in each region is identical, then intermediate region
Two Areas can be taken as.
In this step, acoustic impedance corresponding to each region can also be calculated according to formula (1).
Step 103, acoustic impedance calculates the acoustic impedance of sampled point according to corresponding to each region.
In this step, the acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to each region to be included：
According to formulaCalculate the acoustic impedance of sampled point；
Wherein, ZpFor the acoustic impedance of sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
By the solution of the present invention, the steady component of the resonance zone in echo is divided into multiple regions, according to multiple
Acoustic impedance corresponding to region calculates the acoustic impedance of sampled point, because the back wave that the steady component of resonance zone includes is less,
So as to improve the precision of acoustic impedance.
For example, Fig. 3 is the acoustic impedance curve synoptic diagram being calculated using the method for existing method and the present invention.In Fig. 3,
The actual acoustic impedance of cementing concrete is 7MRayl, and when being calculated using existing method, calculating acoustic impedance from the 15-30us of echo is
The impedance that 4.0MRayl, 20us are calculated with rear region uses the method for the present invention when being calculated between 6-10MRayl,
Average value is 8MRayl.The influence of miscellaneous signal can more be eliminated to the steady component subregion of resonance zone, improve acoustic resistance
Anti- precision.
Further, this method also includes：
Step 104, the acoustic impedance evaluating cementing quality according to sampled point.
In this step, it is believed that the acoustic impedance of sampled point is higher, and cementing quality is better.For example, table 1 is evaluation sampled point
Cementing quality signal table.As shown in table 1, when cement density is 2.2, if the acoustic impedance of sampled point is auspicious more than 5.7 million
Sharp (MRayl), the then cementing quality for judging sampled point are excellent；If the acoustic impedance of sampled point is more than 4MRayl and is less than
5.7MRayl, the then cementing quality for judging sampled point are medium；If the acoustic impedance of sampled point is less than 4MRayl, judge
The cementing quality of sampled point is poor.Other situations, by that analogy.
Table 1
Further, when the acoustic impedance for judging sampled point is less than the first predetermined threshold value, this method also includes：According to adopting
The acoustic impedance of sampling point obtains the acoustic impedance difference of sampled point；The acoustic impedance difference for judging to obtain is more than or equal to the second default threshold
Value, the cementing quality of sampled point is evaluated according to the acoustic impedance difference of acquisition.
Wherein, when the acoustic impedance of sampled point is more than or equal to the first predetermined threshold value, it is believed that sampled point is solid, due to
When cement density is relatively low, the acoustic impedance of sampled point and the acoustic impedance of fluid relatively, in the acoustic impedance of sampled point are less than first
During predetermined threshold value, sampled point is probably solid, it is also possible to fluid, therefore, it is necessary to the acoustic impedance difference of sampled point is calculated to do
Further determine that.When the acoustic impedance difference of the sampled point of acquisition is more than or equal to the second predetermined threshold value, it is believed that sampled point is solid
Body, when the acoustic impedance difference of the sampled point of acquisition is less than the second predetermined threshold value, it is believed that sampled point is fluid.
Wherein, the first predetermined threshold value and the second predetermined threshold value can be obtained by experiment test, by experiment test, first
Predetermined threshold value can be taken as 3MRayl, and the second predetermined threshold value can be taken as 5MRayl.
Wherein, the acoustic impedance difference of sampled point is bigger, it is believed that cementing quality is better.
Wherein, the acoustic impedance difference of sampled point is obtained according to the acoustic impedance of sampled point to be included：
According to formulaCalculate the acoustic impedance difference of sampled point；
Wherein, PdFor the acoustic impedance difference of sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions, Z0iFor
Benchmark acoustic impedance corresponding to ith zone.
Wherein, benchmark acoustic impedance refers to do not have the acoustic impedance obtained in the case of cement outside sleeve pipe.
Referring to Fig. 4, the invention also provides a kind of device for obtaining acoustic impedance, comprise at least：
Acquisition module, for obtaining the steady component of resonance zone from the echo of sampled point；
Division module, for the steady component of the resonance zone of acquisition to be divided into two or more regions；
First computing module, for acoustic impedance corresponding to calculating each region according to the resonance wave in each region；
Second computing module, the acoustic impedance of sampled point is calculated for the acoustic impedance according to corresponding to each region.
In the device of the present invention, in addition to：
First evaluation module, for the acoustic impedance evaluating cementing quality according to sampled point.
In the device of the present invention, in addition to：
Second evaluation module, for judging that the acoustic impedance of sampled point is less than the first predetermined threshold value, according to the sound of sampled point
Impedance obtains the acoustic impedance difference of sampled point；The acoustic impedance difference for judging to obtain is more than or equal to the second predetermined threshold value, according to
The cementing quality of the acoustic impedance difference evaluation sampled point of acquisition.
In the device of the present invention, the second evaluation module is specifically used for：
Judge that the acoustic impedance of sampled point is less than the first predetermined threshold value, according to formulaCalculate sampling
The acoustic impedance difference of point；Wherein, PdFor the acoustic impedance difference of sampled point, ZiFor acoustic impedance corresponding to ith zone, N is region
Number, Z0iFor benchmark acoustic impedance corresponding to ith zone；The acoustic impedance difference for judging to obtain is more than or equal to the second default threshold
Value, the cementing quality of sampled point is evaluated according to the acoustic impedance difference of acquisition.
In the device of the present invention, the first computing module is specifically used for：
According to formulaCalculate acoustic impedance corresponding to ith zone.
Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is the resonance wave amplitude and reflection wave amplitude of ith zone
Between ratio, B2 be reference point echo in intermediate region resonance wave amplitude and reflect wave amplitude between ratio.
In the device of the present invention, the second computing module is specifically used for：
According to formulaCalculate the acoustic impedance of sampled point；
Wherein, ZpFor the acoustic impedance of sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
It should be noted that embodiment described above be for only for ease of it will be understood by those skilled in the art that, and
It is not used in and limits the scope of the invention, on the premise of the inventive concept of the present invention is not departed from, those skilled in the art couple
Any obvious replacement and improvement that the present invention is made etc. is within protection scope of the present invention.
Claims (12)
- A kind of 1. method for obtaining acoustic impedance, it is characterised in that including：The steady component of resonance zone is obtained from the echo of sampled point；The steady component of the resonance zone of acquisition is divided into two or more regions；The acoustic impedance according to corresponding to the resonance wave in each region calculates each region；The acoustic impedance of sampled point is calculated according to acoustic impedance corresponding to each region.
- 2. according to the method for claim 1, it is characterised in that this method also includes：According to the acoustic impedance evaluating cementing quality of the sampled point.
- 3. according to the method for claim 1, it is characterised in that when the acoustic impedance for judging the sampled point is pre- less than first If during threshold value,The acoustic impedance difference of the sampled point is obtained according to the acoustic impedance of the sampled point；When the acoustic impedance difference for judging to obtain is more than or equal to the second predetermined threshold value, it is believed that sampled point is solid, according to institute The acoustic impedance difference for stating acquisition evaluates the cementing quality of the sampled point.
- 4. according to the method for claim 3, it is characterised in that the sound that sampled point is obtained according to the acoustic impedance of sampled point Impedance differences include：According to formulaCalculate the acoustic impedance difference of the sampled point；Wherein, PdFor the acoustic impedance difference of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions, Z0iFor Benchmark acoustic impedance corresponding to i region；Wherein, the benchmark acoustic impedance, which refers to be included in outside sleeve pipe, does not have the acoustic impedance obtained in the case of cement.
- 5. according to the method described in claims 1 to 3 any one, it is characterised in that the resonance wave meter according to each region Acoustic impedance corresponding to calculating each region includes：According to formulaCalculate acoustic impedance corresponding to ith zone；Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is between the resonance wave amplitude of ith zone and reflection wave amplitude Ratio, B2 are the ratio between the resonance wave amplitude of the intermediate region in reference point echo and reflection wave amplitude.
- 6. according to the method described in claims 1 to 3 any one, it is characterised in that the acoustic resistance according to corresponding to each region The anti-acoustic impedance for calculating sampled point includes：According to formulaCalculate the acoustic impedance of the sampled point；Wherein, ZpFor the acoustic impedance of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
- 7. a kind of device for obtaining acoustic impedance, it is characterised in that comprise at least：Acquisition module, for obtaining the steady component of resonance zone from the echo of sampled point；Division module, for the steady component of the resonance zone of acquisition to be divided into two or more regions；First computing module, for acoustic impedance corresponding to calculating each region according to the resonance wave in each region；Second computing module, the acoustic impedance of sampled point is calculated for the acoustic impedance according to corresponding to each region.
- 8. device according to claim 7, it is characterised in that also include：First evaluation module, for the acoustic impedance evaluating cementing quality according to the sampled point.
- 9. device according to claim 7, it is characterised in that also include：Second evaluation module, for judging that the acoustic impedance of the sampled point is less than the first predetermined threshold value, according to the sampled point Acoustic impedance obtain the acoustic impedance difference of the sampled point；Preset when the acoustic impedance difference for judging to obtain is more than or equal to second During threshold value, it is believed that sampled point is solid, and the cementing quality of the sampled point is evaluated according to the acoustic impedance difference of the acquisition.
- 10. device according to claim 9, it is characterised in that second evaluation module is specifically used for：Judge that the acoustic impedance of the sampled point is less than the first predetermined threshold value, according to formulaAdopted described in calculating The acoustic impedance difference of sampling point；Wherein, PdFor the acoustic impedance difference of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is Number of regions, Z0iFor benchmark acoustic impedance corresponding to ith zone；It is default that the acoustic impedance difference for judging to obtain is more than or equal to second Threshold value, the cementing quality of the sampled point is evaluated according to the acoustic impedance difference of the acquisition；Wherein, the benchmark acoustic impedance, which refers to be included in outside sleeve pipe, does not have the acoustic impedance obtained in the case of cement.
- 11. according to the device described in claim 7~9 any one, it is characterised in that first computing module is specifically used In：According to formulaCalculate acoustic impedance corresponding to ith zone；Wherein, ZiFor acoustic impedance corresponding to ith zone, b2 is between the resonance wave amplitude of ith zone and reflection wave amplitude Ratio, B2 are the ratio between the resonance wave amplitude of the intermediate region in reference point echo and reflection wave amplitude.
- 12. according to the device described in claim 7~9 any one, it is characterised in that second computing module is specifically used In：According to formulaCalculate the acoustic impedance of the sampled point；Wherein, ZpFor the acoustic impedance of the sampled point, ZiFor acoustic impedance corresponding to ith zone, N is number of regions.
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| CN106383173B (en) * | 2016-09-13 | 2019-12-06 | 中国海洋石油集团有限公司 | Cement acoustic impedance calculation method and device |
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| CN1017915B (en) * | 1988-06-09 | 1992-08-19 | 中国科学院声学研究所 | Method of using acoustic wave to evaluate cement-bond well quality in all its aspests |
| US6041861A (en) * | 1997-12-17 | 2000-03-28 | Halliburton Energy Services, Inc. | Method to determine self-calibrated circumferential cased bond impedance |
| US20060067162A1 (en) * | 2004-09-29 | 2006-03-30 | Blankinship Thomas J | Ultrasonic cement scanner |
| CN102128028B (en) * | 2010-01-12 | 2013-06-26 | 同济大学 | Ultrasonic signal inversion method for evaluating cement and formation interface cementing quality |
| US8767506B2 (en) * | 2011-12-20 | 2014-07-01 | Schlumberger Technology Corporation | Using higher order harmonics to determine acoustic impedance of material behind borehole casings |
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Address after: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee after: China Oilfield Services Limited Patentee after: China Offshore Oil Group Co., Ltd. Address before: 100010 Chaoyangmen North Street, Dongcheng District, Dongcheng District, Beijing Co-patentee before: China Oilfield Services Limited Patentee before: China National Offshore Oil Corporation |