CN106499383A - A kind of method of evaluating cementing barrier integrity - Google Patents
A kind of method of evaluating cementing barrier integrity Download PDFInfo
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- CN106499383A CN106499383A CN201610911546.1A CN201610911546A CN106499383A CN 106499383 A CN106499383 A CN 106499383A CN 201610911546 A CN201610911546 A CN 201610911546A CN 106499383 A CN106499383 A CN 106499383A
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- 230000004888 barrier function Effects 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 27
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000523 sample Substances 0.000 claims abstract description 44
- 238000005553 drilling Methods 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 239000011083 cement mortar Substances 0.000 claims abstract description 21
- 230000001052 transient effect Effects 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims description 36
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 13
- 239000012530 fluid Substances 0.000 claims description 10
- 238000005259 measurement Methods 0.000 claims description 9
- 239000002002 slurry Substances 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 6
- 238000002474 experimental method Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000003475 lamination Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 description 60
- 239000007789 gas Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 239000004816 latex Substances 0.000 description 4
- 229920000126 latex Polymers 0.000 description 4
- 239000004570 mortar (masonry) Substances 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 239000013530 defoamer Substances 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 3
- 239000003129 oil well Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001965 increasing effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003032 molecular docking Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Geophysics (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The present invention relates to a kind of method of evaluating cementing barrier integrity, comprises the following steps：1) produce in upper end open, the simulated formation of the tubular structure of lower end closed；2) simulated formation that makes is placed in bucket；3) sleeve pipe for scribbling drilling well liquid layer is put in simulated formation；4) ultrasonic probe is centrally located in sleeve pipe, and ultrasonic probe is electrically connected with outside oscillograph, pulse generation receiving instrument and high-speed transient signal Acquisition Instrument；5) water filling in bucket, water surface elevation fill water to simulated formation upper port, in sleeve pipe；6) cement mortar is prepared；7) cement mortar is injected between sleeve pipe and the inwall of simulated formation, after end to be implanted, water filling in bucket makes water surface elevation concordant with sleeve upper end face, Hou Ning；8) ultrasonic probe is opened, the well cementation sound width curve for obtaining time point to be measured is measured using pulse generation receiving instrument, read well cementation sound width curve Mintrop wave peak value；9) judge whether well cementation integrity is qualified according to well cementation barrier integrity criterion.
Description
Technical field
The present invention relates to a kind of method of evaluating cementing barrier integrity, belongs to petroleum natural gas exploration field.
Background technology
After well cementation, sleeve pipe-cement sheath-stratum can form an adhesive bond, and this adhesive bond plays protection sleeve pipe, supports ground
The effect of layer, barrier of referred to as cementing the well.The airtight quality for how improving cement sheath between the borehole wall and sleeve pipe is that casing and cementing is closed for a long time
The problem of note, the mechanical property of cementing concrete ring are related to quality and the Oil/gas Well life-span of well cementation barrier.In Oil/gas Well production clothes
During labour, well cementation barrier will be acted on by various load, such as through the effect of pressure, formation rock confined pressure in sleeve pipe transmission
Impacting with high pressure of effect, the wellbore temperatures temperature strain that causes of change and gas well etc., and cycle in the whole Oil/gas Well life-span
Interior, often multiple load are acted on and change simultaneously, the effect and change of these load, and well cementation barrier system can be caused to receive
The change of power state, can cause barrier seal thrashing of cementing the well, annular space occur and steam and showing that formation fluid is mutually altered when serious
As, cement sheath loses the protective effect to sleeve pipe, accelerates casing failure, shortens the Oil/gas Well life-span, and the lighter can cause annular space channelling,
Affect well construction period, severe one that well may be caused to scrap, serious economic loss is caused.For a long time, for cementing slurry ring
The prediction of sealing integrity and digital simulation have a lot of researchs, but for real one second interface environment of simulated formation right
Which is cemented the well, and seldom, this just makes well cementation barrier integrity to the experimental technique for measuring well cementation sound width curve using logger
There is significant limitation in evaluation.
Content of the invention
For problem present in background technology, it is an object of the invention to provide a kind of realize that well cementation barrier is simple, smart
The method of the accurate well cementation barrier integrity that evaluates.
For achieving the above object, the present invention is employed the following technical solutions：A kind of method of evaluating cementing barrier integrity, bag
Include following steps：1) produce in upper end open, the simulated formation of the tubular structure of lower end closed；2) by the simulation that makes ground
It is placed in bucket；3) sleeve pipe for scribbling drilling well liquid layer is put in simulated formation, the sleeve pipe after being put into has same with simulated formation
Axle relation；4) ultrasonic probe is centrally located by fixed lid in sleeve pipe, ultrasonic probe is connect with outside oscillograph, pulse generation
Receive instrument and the electrical connection of high-speed transient signal Acquisition Instrument；5) water filling in bucket, upper end of the water surface elevation less than simulated formation 1, sleeve pipe
In fill water；6) required to determine cement mortar according to cement slurry property in NB/T1404.1-2015 (shale gas casing and cementing)
Formula proportion, prepares cement mortar；7) cement mortar is injected between sleeve pipe and the inwall of simulated formation, and injection process ensures not formed
Bubble, the upper surface of cement sheath should be higher than that whole probe top, after end to be implanted, continue water filling, do not had the water surface in bucket
Simulated formation and, Hou Ning concordant with sleeve upper end face；8) ultrasonic probe is opened, is obtained using the measurement of pulse generation receiving instrument to be measured
Multiple well cementation sound width curves of time point, take well cementation sound width curve Mintrop wave peak value between, waveform clearly well cementation sound width
Curve, reads this well cementation sound width curve Mintrop wave peak value；9) integrity of cementing the well is judged according to following criterions：When well cementation curve
When Mintrop wave peak value is not higher than 50mv, judge to cement the well integrity as outstanding；When well cementation curve Mintrop wave peak value is between 50mv and 105mv
When, judge to cement the well integrity as qualified but not outstanding；When curve Mintrop wave peak value of cementing the well is not less than 105mv, judge that well cementation is complete
Property for unqualified.
The step 1) in the manufacturing process of simulated formation be：Corresponding mould is made according to the size of simulated formation,
Lithological composition by simulated formation is treated prepares slurry to be poured into.
In the step 3) in, the drilling well liquid layer of bushing outer surface is formed by way of lamination is smeared, i.e., first in sleeve pipe
Surface brush one times drilling fluid, treat drilling fluid dry after brush second time, until the thickness of drilling well liquid layer reaches preset value.
In the step 4) in, the pulse generation receiving instrument is used for surveying using CTS-8077PR type pulse generations receiving instrument
The sound width of well cementation barrier；The digital oscilloscope adopts general source DS1104Z digital oscilloscopes, for observing the sound of receptor acceptance
Waveform；The high-speed transient signal Acquisition Instrument is used for carrying out analog/digital conversion to the signal for receiving.
Due to taking above technical scheme, which has advantages below to the present invention：1) present invention is not by different lithology stratum and
Real lab simulation is done with size well cementation barrier from the bonding capacity of different mortar architectures, overcome existing method simulation and divide
The deficiency of analysis so that the evaluation of well cementation barrier is more complete.2) experimental principle reliability of the present invention, experimental procedure are clear, test number
According to true and reliable, the process of experimental data is concluded simple.3) experimental implementation of the present invention is without the need for work numerous and diverse in a large number.4) it is scene
Different lithology, different wellbore environments are selected suitable well cementing mortar architecture and provide advisory opinion.
Description of the drawings
Fig. 1 is a kind of structural representation of evaluating cementing barrier integrity device of the invention；
Group practicess overlooking the structure diagrams of the Fig. 2 for embodiments of the invention one；
Fig. 3 is the well cementation sound width curve chart of the 48th hour of embodiments of the invention one, and wherein vertical coordinate per lattice scale is
0.2v；
Group practicess overlooking the structure diagrams of the Fig. 4 for embodiments of the invention two；
Fig. 5 is the well cementation sound width curve chart of the 48th hour of embodiments of the invention two, and wherein vertical coordinate per lattice scale is
0.2v；
Group practicess overlooking the structure diagrams of the Fig. 6 for embodiments of the invention three；
Fig. 7 is the well cementation sound width curve chart of the 24th hour of embodiments of the invention three, and wherein vertical coordinate per lattice scale is
0.2v；
Fig. 8 is the well cementation sound width curve chart of the 48th hour of embodiments of the invention three, and wherein vertical coordinate per lattice scale is
0.2v；
Fig. 9 is the well cementation sound width curve chart of the 48th hour of embodiments of the invention four, and wherein vertical coordinate per lattice scale is
0.2v.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in detail.
As shown in figure 1, the present invention proposes a kind of method of evaluating cementing barrier integrity, comprise the following steps：
1) produce in upper end open, the simulated formation 1 of the tubular structure of lower end closed.
2) simulated formation 1 that makes is placed in bucket 2.
3) sleeve pipe 3 for scribbling drilling well liquid layer 5 is put in simulated formation 1, the sleeve pipe 3 after being put into is had with simulated formation 1
Coaxial relation.
4) ultrasonic probe 7 is fixedly installed between two parties by fixed lid 6 in sleeve pipe 3, ultrasonic probe 7 and outside oscillograph,
Pulse generation receiving instrument and the electrical connection of high-speed transient signal Acquisition Instrument.
5) water filling in bucket 2, water surface elevation fill water less than the upper end of simulated formation 1 in sleeve pipe.
6) required to determine matching somebody with somebody for cement mortar according to cement slurry property in NB/T1404.1-2015 (shale gas casing and cementing)
Square ratio, prepares cement mortar.
7) cement mortar is injected between the inwall of sleeve pipe 3 and simulated formation 1, and injection process should be slow, ensures injection as far as possible
During do not form bubble, the upper surface of cement sheath 4 is should be higher than that at the top of 7 probe portions of whole probe, after end to be implanted, in bucket
Continue water filling in 2, make the water surface not have simulated formation 1 and, Hou Ning concordant with 3 upper surface of sleeve pipe, the drilling well liquid layer 5 on 3 surface of sleeve pipe
Dehydration after injection cement mortar, reduction in bulk form interannular space between drilling well liquid layer 5 and cement sheath.
8) ultrasonic probe 7 is opened, the well cementation sound width curve for obtaining time point to be measured is gathered using pulse generation receiving instrument, read
Go out well cementation sound width curve Mintrop wave peak value, the time point of measurement is adjusted according to curing time and experiment purpose.
9) integrity of cementing the well is judged according to following criterions：When curve Mintrop wave peak value of cementing the well is not higher than 50mv, sentence
Surely well cementation integrity is outstanding；When curve Mintrop wave peak value is cemented the well between 50mv and 105mv, judge to cement the well integrity as qualified
But it is outstanding；When curve Mintrop wave peak value of cementing the well is not less than 105mv, judge to cement the well integrity as unqualified.
In above-described embodiment, step 1) in, it is simulated in order to the stratum to different lithology, can be according to waiting to simulate
The lithological composition on stratum 1 makes corresponding simulated formation 1.When each simulated formation 1 is made, mould is first produced, then
Slurry is prepared according to the lithological composition of the simulated formation 1 and ratio, then slurry is poured in mould, treat that slurry gradually shapes and do not flow
Mould is separated with simulated formation 1 when dynamic, the simulated formation 1 after separating is In Shade to make the abundant aquation of composition therein, by
This completes the making of simulated formation 1.
In above-described embodiment, step 3) in, the drilling well liquid layer 5 of 3 outer surface of sleeve pipe can be formed by way of lamination is smeared,
First brush one times drilling fluid on the surface of sleeve pipe 3, treat drilling fluid dry after brush second time, until the thickness of drilling well liquid layer 5 reaches
Arrive preset value.
In above-described embodiment, step 4) in, the sound width of barrier of cementing the well is surveyed using CTS-8077PR type pulse generations receiving instrument,
The instrument meets Europe superscript (EN12668：2000) probe test system is required, is amplified with extremely low noise and wide band reception
Device, and advanced radiating circuit is constituted by high-performance square wave pulse generator and high-tension circuit, can organize in pairs with digital oscilloscope
The evaluation of ultrasonic probe acoustic characteristic and the test of performance indications, the probe are one one receipts sonic probe, can simulate actual sound
Width is logged well, and frequency probe is 18Khz or so, is close to the probe 20Khz of actual production.
In above-described embodiment, step 4) in, digital oscilloscope is utilized for observing the acoustic waveform of receptor acceptance, can be with
Using general source DS1104Z digital oscilloscopes, a width of 100MHz of the oscillograph band；There are 4 passages, real-time sampling rate is during single channel
1GSa/s, standard configuration are that single channel storage depth is 12Mpts, and during apolegamy, single channel storage depth is 24Mpts, by simulating sum
Word passage carries out mixed signal analysis.
In above-described embodiment, the step 4) in, using high-speed transient signal Acquisition Instrument the signal for receiving is carried out mould/
Number conversion, will receive signal and is changed into numerical quantities；Computer is connected with high-speed transient signal Acquisition Instrument, high-speed transient signal Acquisition Instrument
Collected mail by netting twine docking using software and number be acquired, probe detection to ripple have casing wave, formation wave, cement sheath ripple successively
With drilling well fluid wave.
The present invention is evaluated based on 7 pairs of well cementation barrier integrities of ultrasonic probe, and its rationale is when sleeve pipe 3 and cement
When ring 4, the degree of consolidation difference of simulated formation 1, the well cementation sound width curve chart obtained by pulse generation receiving instrument measurement is
Different.When for free pipe when only produce casing wave, its amplitude is big, and Acoustic amplitude logging is often carved with free pipe wave amplitude
Degree, casing wave are regular, and the envelope of whole wave mode has high amplitude and energy, and duration is long.When sleeve pipe 3 only with cement sheath
4 when cementing, and most of energy enters cement sheath 4, because cement sheath wave attenuation is big, sleeve pipe wave amplitude is greatly reduced；Set
Occur after tube wave for cement sheath ripple, cement sheath wave attenuation is random, and amplitude is little, does not show sometimes；Without formation wave；Only a small amount of energy
Amount enters annular fluid layer, enters that stratum is less, finally occur for drilling well fluid wave.When cement sheath 4 and sleeve pipe 3 and simulated formation
1 when cementing completely, due to the acoustical coupling between sleeve pipe 3, cement sheath 4 and simulated formation 1 good, the major part energy of sleeve pipe 3
Amount is transmitted to simulated formation 1, and stratum wave amplitude is big, and sleeve pipe wave amplitude very little is superimposed upon the end of formation wave.
Below by the evaluation effect that specific embodiment illustrates the inventive method：
Illustrate that four simulated formations 1 in following four embodiments are prepared from the slurry of same ratio composition
, four sleeve pipes 3 in following four embodiments are intercepted from same a pipe.
Embodiment one
1st, free pipe implementation process is as follows：
1) produce in upper end open, the simulated formation 1 of the tubular structure of lower end closed, its a height of 1200mm, external diameter is
φ 500mm, internal diameter are φ 215.9mm.
2) simulated formation 1 that makes is placed in bucket 2.
3) sleeve pipe 3 for being not coated with drilling well liquid layer 5 is put in simulated formation 1 using crane, sleeve pipe 3 its external diameter is φ
139.7mm, internal diameter are φ 127.6mm, and length is 1200mm.Sleeve pipe 3 after being put into has coaxial relation with simulated formation 1.
4) ultrasonic probe 7 is fixedly installed between two parties by fixed lid 6 in sleeve pipe 3, ultrasonic probe 7 and outside oscillograph,
Pulse generation receiving instrument and the electrical connection of high-speed transient signal Acquisition Instrument.
5) water filling in bucket 2, water surface elevation fill water less than the upper end of simulated formation 1 in sleeve pipe.
6) because the present embodiment observation be free pipe when experimental result, do not prepare cement mortar in case subsequently making
With.
7) water is injected between the inwall of sleeve pipe 3 and simulated formation 1, and injection process should be slow, ensures injection process as far as possible
In do not form bubble, the upper surface of water is should be higher than that at the top of 7 probe portions of whole probe, after end to be implanted, continues note in bucket 2
Water makes the water surface not have simulated formation 1 and concordant with 3 upper surface of sleeve pipe.Its overlooking the structure diagram is as shown in Figure 2.
8) ultrasonic probe 7 is opened, and the acquisition waveform of the 48th hour is gathered using CTS-8077PR pulse generations receiving instrument clear
Clear well cementation sound width curve, reads well cementation sound width curve Mintrop wave peak value, i.e. the sound width of free pipe, and measurement result is shown in Fig. 3.
9) according to the decision rule of well cementation integrity, the well cementation Mintrop wave sound width 199.2mv of measurement is illustrated solid more than 105mv
Well weak bonding, such case are the worst situations of barrier integrity of cementing the well.
Embodiment two
2nd, when only cementing with cement sheath 4 implementation process of sleeve pipe 3 is as follows：
1) produce in upper end open, the simulated formation 1 of the tubular structure of lower end closed, its a height of 1200mm, external diameter is
φ 500mm, internal diameter are φ 215.9mm.
2) simulated formation 1 that makes is placed in bucket 2.
3) sleeve pipe 3 for being not coated with drilling well liquid layer 5 is put in simulated formation 1 using crane, sleeve pipe 3 its external diameter is φ
139.7mm, internal diameter are φ 127.6mm, and length is 1200mm.Sleeve pipe 3 after being put into has coaxial relation with simulated formation 1.
4) ultrasonic probe 7 is fixedly installed between two parties by fixed lid 6 in sleeve pipe 3, ultrasonic probe 7 and outside oscillograph,
Pulse generation receiving instrument and the electrical connection of high-speed transient signal Acquisition Instrument.
5) water filling in bucket 2, water surface elevation fill water less than the upper end of simulated formation 1 in sleeve pipe 3.
6) with 100 parts of G level oil-well cements, 27.5 parts of fresh water, 1 part of defoamer, 1 part of latex stabilizer, 5 parts of latex, 4 parts of increasings
Tough dose, 1 part of dispersant and 0.5 part of retarder are preparing cement mortar.
7) cement mortar is injected between the inwall of sleeve pipe 3 and simulated formation 1, and injection process should be slow, ensures injection as far as possible
During do not form bubble, the upper surface of cement sheath 4 is should be higher than that at the top of 7 probe portions of whole probe, after end to be implanted, in bucket
Water filling in 2, makes water surface elevation concordant with 3 upper surface of sleeve pipe, Hou Ning, and the drilling well liquid layer 5 on 3 surface of sleeve pipe is lost after injection cement mortar
Water, reduction in bulk form interannular space between drilling well liquid layer 5 and cement sheath.Its overlooking the structure diagram is as shown in Figure 4.
8) ultrasonic probe 7 is opened, and the acquisition waveform of the 48th hour is gathered using CTS-8077PR pulse generations receiving instrument clear
Clear well cementation sound width curve, reads well cementation sound width curve Mintrop wave peak value, and its well cementation sound width curve is shown in Fig. 5.
9) according to the decision rule of well cementation integrity, measurement result surface well cementation sound width curve Mintrop wave peak value is 62.44mv,
Illustrate that well cementation barrier integrity is up-to-standard, such case is the best situation of barrier integrity of cementing the well.
Embodiment three
3rd, one process of situation that cement sheath 4 and sleeve pipe 3 and simulated formation 1 are all cemented is as follows：
1) produce in upper end open, the simulated formation 1 of the tubular structure of lower end closed, its a height of 1200mm, external diameter is
φ 500mm, internal diameter are φ 215.9mm.
2) simulated formation 1 that makes is placed in bucket 2.
3) sleeve pipe 3 for scribbling drilling well liquid layer 5 is put in simulated formation 1 using crane, sleeve pipe 3 its external diameter is φ
139.7mm, internal diameter are φ 127.6mm, and length is 1200mm.Sleeve pipe 3 after being put into has coaxial relation with simulated formation 1.
4) ultrasonic probe 7 is fixedly installed between two parties by fixed lid 6 in sleeve pipe 3, ultrasonic probe 7 and outside oscillograph,
Pulse generation receiving instrument and the electrical connection of high-speed transient signal Acquisition Instrument.
5) water filling in bucket 2, water surface elevation fill water less than the upper end of simulated formation 1 in sleeve pipe 3.
6) with 100 parts of G level oil-well cements, 27.5 parts of fresh water, 1 part of defoamer, 1 part of latex stabilizer, 5 parts of latex, 4 parts of increasings
Tough dose, 1 part of dispersant and 0.5 part of retarder are preparing cement mortar.
7) cement mortar is injected between the inwall of sleeve pipe 3 and simulated formation 1, and injection process should be slow, ensures injection as far as possible
During do not form bubble, the upper surface of cement sheath 4 is should be higher than that at the top of 7 probe portions of whole probe, after end to be implanted, in bucket
Water filling in 2, makes water surface elevation concordant with 3 upper surface of sleeve pipe, Hou Ning, and the drilling well liquid layer 5 on 3 surface of sleeve pipe is lost after injection cement mortar
Water, reduction in bulk form interannular space between drilling well liquid layer 5 and cement sheath.Its overlooking the structure diagram is as shown in Figure 6.
8) ultrasonic probe 7 is opened, is obtained the 24th hour and 48 hours using the collection of CTS-8077PR pulse generations receiving instrument
Waveform clearly well cementation sound width curve, read well cementation sound width curve Mintrop wave peak value, its well cementation sound width curve is shown in Fig. 7 and Fig. 8.
9) according to the decision rule of well cementation integrity, measurement result surface well cementation sound width curve Mintrop wave peak value is 113.2mv
And 85.88mv, can learn that the well cementation barrier integrity of the 24th hour is unqualified, the well cementation barrier integrity of the 48th hour is closed
Lattice, this illustrate well cementation barrier integrity with the cementing time about certain relation from one side.
Example IV
4th, two process of situation that cement sheath and sleeve pipe and simulated formation are all cemented is as follows：
1) produce in upper end open, the simulated formation 1 of the tubular structure of lower end closed, its a height of 1200mm, external diameter is
φ 500mm, internal diameter are φ 215.9mm.
2) simulated formation 1 that makes is placed in bucket 2.
3) sleeve pipe 3 for scribbling drilling well liquid layer 5 is put in simulated formation 1 using crane, sleeve pipe 3 its external diameter is φ
139.7mm, internal diameter are φ 127.6mm, and length is 1200mm.Sleeve pipe 3 after being put into has coaxial relation with simulated formation 1.
4) ultrasonic probe 7 is fixedly installed between two parties by fixed lid 6 in sleeve pipe 3, ultrasonic probe 7 and outside oscillograph,
Pulse generation receiving instrument and the electrical connection of high-speed transient signal Acquisition Instrument.
5) water filling in bucket 2, water surface elevation fill water less than the upper end of simulated formation 1 in sleeve pipe 3.
6) with 100 parts of G level oil-well cements, 43.75 parts of fresh water, 0.125 part of defoamer, 0.25 part of dispersant, 0.25 part of drop
Dehydration agent and 0.375 part of retarder are preparing cement mortar.
7) cement mortar is injected between the inwall of sleeve pipe 3 and simulated formation 1, and injection process should be slow, ensures injection as far as possible
During do not form bubble, the upper surface of cement sheath 4 is should be higher than that at the top of 7 probe portions of whole probe, after end to be implanted, in bucket
Water filling in 2, makes water surface elevation concordant with 3 upper surface of sleeve pipe, Hou Ning, and the drilling well liquid layer 5 on 3 surface of sleeve pipe is lost after injection cement mortar
Water, reduction in bulk form interannular space between drilling well liquid layer 5 and cement sheath.
8) ultrasonic probe 7 is opened, and the acquisition waveform of the 48th hour is gathered using CTS-8077PR pulse generations receiving instrument clear
Clear well cementation sound width curve, reads well cementation sound width curve Mintrop wave peak value, and its well cementation sound width curve is shown in Fig. 9.
9) according to the decision rule of well cementation integrity, measurement result surface well cementation sound width curve Mintrop wave peak value is 117.1mv,
Can learn that the well cementation barrier integrity of 48 hours is unqualified, this illustrates that well cementation barrier integrity is had with well cementing mortar architecture
Relation.
Illustrate that by this example the integrity of the well cementation barrier of different mortar architectures is different.
Can be seen that whether the method can complete with evaluating cementing barrier by aforementioned four embodiment.
The various embodiments described above are only used for having carried out further specifically the purpose of the present invention, technical scheme and beneficial effect
Bright, the present invention is not limited to, all any modification, equivalent substitution and improvements that within the spirit and principles in the present invention, is done
Deng should be included within the scope of the present invention.
Claims (4)
1. a kind of method of evaluating cementing barrier integrity, comprises the following steps：
1) produce in upper end open, the simulated formation of the tubular structure of lower end closed；
2) simulated formation that makes is placed in bucket；
3) sleeve pipe for scribbling drilling well liquid layer is put in simulated formation, the sleeve pipe after being put into has coaxial relation with simulated formation；
4) ultrasonic probe is centrally located by fixed lid in sleeve pipe, ultrasonic probe is received with outside oscillograph, pulse generation
Instrument and the electrical connection of high-speed transient signal Acquisition Instrument；
5) water filling in bucket, water surface elevation fill water less than the upper end of simulated formation in sleeve pipe；
6) cement mortar is prepared；
7) inject cement mortar between sleeve pipe and the inwall of simulated formation, injection process ensures not forming bubble, cement sheath upper
End face should be higher than that whole probe detection atop part, after end to be implanted, continues water filling, make the water surface not have simulated formation in bucket
And, Hou Ning concordant with sleeve upper end face；
8) ultrasonic probe is opened, the well cementation sound width curve for obtaining time point to be measured is gathered using pulse generation receiving instrument, read solid
Well sound width curve Mintrop wave peak value, the time point of measurement are adjusted according to curing time and experiment purpose；
9) integrity of cementing the well is judged according to following criterions：When curve Mintrop wave peak value of cementing the well is not higher than 50mv, judge solid
Well barrier integrity is outstanding；When cement the well curve Mintrop wave peak value between 50mv and 105mv when, judges well cementation barrier integrity as
Qualified but not outstanding；When curve Mintrop wave peak value of cementing the well is not less than 105mv, judge to cement the well barrier integrity as unqualified.
2. a kind of method of evaluating cementing barrier integrity as claimed in claim 1, it is characterised in that：The step 1) in
The manufacturing process of simulated formation is：Corresponding mould is made according to the size of simulated formation, by the lithological composition for treating simulated formation
Prepare slurry and pour into and produce in mould simulated formation.
3. a kind of method of evaluating cementing barrier integrity as claimed in claim 1, it is characterised in that：In the step 3)
In, the drilling well liquid layer of bushing outer surface is formed by way of lamination is smeared, i.e., first brush one times drilling fluid on the surface of sleeve pipe, treat
Drilling fluid dry after brush second time, until the thickness of drilling well liquid layer reaches preset value.
4. a kind of method of evaluating cementing barrier integrity as claimed in claim 1, it is characterised in that：In the step 4)
In, the pulse generation receiving instrument is used for the sound width for surveying well cementation barrier using CTS-8077PR type pulse generations receiving instrument；Described
Digital oscilloscope adopts general source DS1104Z digital oscilloscopes, for observing the acoustic waveform of receptor acceptance；The High-speed transient
Signal sampler is used for carrying out analog/digital conversion to the signal for receiving.
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| CN109611080A (en) * | 2018-12-10 | 2019-04-12 | 中海石油(中国)有限公司 | A kind of indoor simulation device and method for evaluating cement sheath bonding quality |
| CN109827717A (en) * | 2019-03-06 | 2019-05-31 | 中国海洋石油集团有限公司 | A kind of shallow cementing cement test device for air tightness and method |
| CN111411937A (en) * | 2020-02-28 | 2020-07-14 | 中国石油天然气股份有限公司 | Well cementation quality evaluation method and device |
| CN111827976A (en) * | 2020-08-25 | 2020-10-27 | 中国石油大学(华东) | Well cementation quality measuring device and method |
| CN112160742A (en) * | 2020-09-09 | 2021-01-01 | 中石化石油工程技术服务有限公司 | Simulation device and method for establishing well cementation quality evaluation index |
| CN112782002A (en) * | 2021-03-01 | 2021-05-11 | 西南石油大学 | Metal casing deformation testing device in well cementation cement slurry coagulation waiting process |
| CN114144571A (en) * | 2019-07-22 | 2022-03-04 | 沙特***石油公司 | Method of determining wellbore integrity |
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| CN109827717A (en) * | 2019-03-06 | 2019-05-31 | 中国海洋石油集团有限公司 | A kind of shallow cementing cement test device for air tightness and method |
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| CN114151073A (en) * | 2020-09-08 | 2022-03-08 | 中国石油天然气股份有限公司 | Method, device and equipment for evaluating failure consequence of gas well barrier |
| CN114151073B (en) * | 2020-09-08 | 2023-11-28 | 中国石油天然气股份有限公司 | Method, device and equipment for evaluating barrier failure result of gas well |
| CN112160742A (en) * | 2020-09-09 | 2021-01-01 | 中石化石油工程技术服务有限公司 | Simulation device and method for establishing well cementation quality evaluation index |
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| CN114233275B (en) * | 2021-12-10 | 2023-11-14 | 天津大学 | Well cementation quality evaluation method based on array acoustic logging time difference dispersion curve |
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