CN101016837A - Cement interface shearing in annulus supersonic ultrasonic testing method - Google Patents
Cement interface shearing in annulus supersonic ultrasonic testing method Download PDFInfo
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Abstract
The invention discloses a shearing ultrasonic testing method of cement annular interface, comprising that pouring cement pulp between an inner muffle and an outer muffle until the pulp reaches preset height, pours water into the inner muffle and outside the outer muffle until the pressure container is filled, arranging an sonic measuring device vertically and concentrically in the inner muffle, connecting a heating power circuit with all temperature and pressure sensors and the sonic measuring circuit, and connecting the power source, heating the pressure container, and pumping liquid into the pressure container when the temperature reaches preset value, to lift liquid pressure to preset value, processing sonic measurement intermitted, and processing sonic measurement when the cement reaches preset strength, and processing adhesive strength test when the system enters into the adhesive strength test step, and processing the last sonic measurement.
Description
Technical field
The present invention relates to a kind of cementing quality and survey experimental technique, relate to a kind of cement interface shearing in annulus supersonic ultrasonic testing method specifically.
Background technology
At present, casing and cementing circle generally believes that under the condition of cement-free groove, the packing performance of cement sheath depends primarily on it and sleeve pipe reaches and the cementing strength at two interfaces of interlayer, ground (being called first interface and second contact surface).Cementing strength is divided into fluid power cementing strength and clipping knotting strength again.Experiment shows that the fluid power cementing strength is big, and then the clipping knotting strength is also big.When cement sheath closely contacted with sleeve pipe, strength of cement was big, and then the fluid power cementing strength at this interface and clipping knotting strength are also all big.Unfortunately, also nobody can derive strict relationship between this three.Main cause is, cementing strength is not only relevant with strength of cement, also is subjected to the influence of factors such as interface roughness degree, tapering, circularity and confined pressure, and situation is quite complicated.So world-renowned road Weir Si Lunbeixie (Dowell Schlumberger) company thinks what contrast meaning the absolute value of measuring fluid power cementing strength and clipping knotting strength under different condition does not have.Think that simultaneously the clipping knotting strength is almost irrelevant with the size of sample.
Under ground condition, owing to there is the bubble random disturbances that is difficult to eliminate, fluid power cementing strength experimental result discreteness is too big.In view of this, the long Ji Dengren of Daqing oil field sieve (1993) has carried out clipping knotting strength experimental study to cement sheath, has obtained interface cementing strength curve over time.People such as Nahm (1996) transform the cement sheath packing performance of cement paste (MTC) after fixed by interface shearing cementing strength research mud, have obtained important understanding.By above two cross-section studies as can be seen: the first, fixed engineering circle thinks that at present the clipping knotting strength is the feasible way of reflection cement sheath packing performance; The second, the relation of still unmanned research cementing strength and acoustic logging response.Cement the well just boundary and logging community of the latter all thought vital bridge of getting in touch well cementation～well logging, and up to the present do not see the research precedent.
Though, the cementing strength absolute value of measurement under different sleeve surface roughness, different tapering and different circularity situations do not have any value, but, under the experiment condition that guarantees same tapering and circularity, use experimentizes with a kind of sleeve pipe of surface roughness, and the relation between research cementing intensity, confined pressure and the acoustic logging response is very significant certainly.Because it has disclosed the ability of acoustic response reflection cement sheath cementing strength, but reflecting wave response simultaneously is for the variation tendency of cement sheath cementing strength.This variation tendency and a large amount of data of scurrying of testing combine, and can determine corresponding logging evaluation standard.
Acoustic logging be use in the existing method and technology of checking cementing quality the most extensive, generally believe comparatively effective a kind of logging method.People such as G.M.Pardue (1962) have carried out system research to the relation of strength of cement and acoustic logging response under ground condition, and based on this, set up the nomogram of present widely used acoustic attenuation rate (or sound width of cloth) and cement stone compressive strength relation.The experiment of Pardue is for to lay a good foundation up to present primary cement evaluation thereafter.Now, each main oil well logging company of the world and each domestic oil field all adopt the plate of being formulated by this experimental result to carry out primary cement evaluation.This evaluation method is applicable to the cementing quality well logging that utilizes sleeve pipe slide wave class casing wave amplitude and attenuation rate, such as CBL/VDL and SBT etc.According to plate, the acoustic logging signal is converted to strength of cement.Recently the cementing quality well logging of releasing (CET, PET, USI and CAST etc.) that utilizes sleeve pipe back wave class is converted to strength of cement according to the plate of being formulated by other experiment with the back wave relative amplitude.Can also be converted into cementation factor BI by the casing wave amplitude that collects.Can avoid the adverse effect of factors such as the inaccurate and light weight cement well cementation of scale with BI evaluating cementing quality.
A large amount of practices show that the packing performance of cement sheath is not only close with the cementing strength relationship, and quite close with the packing length relation of cement sheath.In the sixties,, it is found that the minimum packing length that guarantees the cement sheath packing is relevant with casing size by scurrying in the experiment many times testing of Gulf of Mexico oil gas field.In using external assessment technique process, China's oil scientific and technical personnel find that cement sheath still might play the packing effect when BI＜0.8, and it is more longer to need only BI＞0.6 and minimum packing length.
But, in the prior art, do not disclose the various parameters in down-hole relation each other.For example, be not disclosed in the relation between fluid power cementing strength, clipping knotting strength and the strength of cement of the cement sheath of maintenance under the different confined pressure conditions, relation between clipping knotting strength, strength of cement and the log response, and the log response variation after the interface shearing destruction etc.
Summary of the invention
Technical problem solved by the invention provides a kind of cement interface shearing in annulus supersonic ultrasonic testing method, for given water/binder ratio and different curing times, can be by measuring cement sheath interface cementing strength and corresponding acoustic logging response under different curing and maintenance pressure condition, combine with the single shaft strength of cement measured value of the cement sample of maintenance under the similarity condition, can study the relation between cement stone compressive strength under the different curing conditions, cement sheath interface cementing strength and the acoustic logging response.
Technical scheme is as follows:
Cement interface shearing in annulus supersonic ultrasonic testing method comprises the steps:
The cement paste that (1) will dispose in proportion injects between inner layer sleeve and the outer layer sleeve, reaches the height of appointment up to cement paste;
(2) place the thin layer dividing plate at the annular space cement top, prevent that the water on it from mixing with cement paste;
(3) in inner layer sleeve He outside the outer layer sleeve, pour water, pressure vessel is filled always;
(4) in inner layer sleeve, settle the acoustic measurement instrument vertically, with one heart;
(5) loam cake of lid compaction forces container is poured water in pressure vessel by the loam cake through hole continuation of loam cake, up to the air at pressure vessel top is all drained;
(6) connect heat power circuit and all temperature, pressure sensor and acoustic measurement circuit, and connect power supply;
(7) start computer;
(8) pressure vessel is heated, when temperature is near set-point by the time,, hydraulic pressure is brought up to set-point pressure vessel inside pumping liquid;
(9) first sound is measured, the parameter of measurement comprise casing wave then, E1 peak-to-peak amplitude, E2 peak-to-peak amplitude or E3 peak-to-peak amplitude;
(10) cement paste enters the constant temperature and pressure maintenance stage, computer controlled automatic pressure vessel temperature inside and hydraulic coupling;
(11) carry out an acoustic measurement at regular intervals, and when cement has reached given intensity, carry out an acoustic measurement again;
(12) when system enters the cementing strength test phase, carry out the cementing strength test, after test finishes, carry out acoustic measurement again.
Further, step (1) is specially:
(100) inner layer sleeve is vertical with outer layer sleeve and be placed on one heart in the pressure vessel, be coated with the last layer butter in the bottom of pressure vessel, place a thin layer dividing plate again;
(101) require the preparation cement paste according to cement formula;
(102) cement paste is injected in the annular space between the two-layer sleeve pipe, directly annotate the height of appointment.
Further, in the step (11), it is corresponding that described acoustic measurement obtains sound wave, corresponding nearly waveform and the waveform far away of comprising of described sound wave.
Further, further comprise step (13), analyze the parameter and the real time record curve that obtain.
Further, in the step (13), the data of described analysis comprise: interface shear strength, curing time or acoustic attenuation rate.
Further comprise the steps:
(14) pressure vessel pressure release is heated, hydraulic pressure and acoustic measurement system cut-off;
(15) press the computer esc key, return to main menu;
(16) the equal pressure container temperature is reduced to manipulable the time, opens pressure vessel, takes out the acoustic measurement instrument, takes out through the fixed inside and outside layer sleeve pipe of cement;
(17) water and the drilled cement in the removing pressure vessel;
(18) pressure vessel cooling;
(19) single shaft strength of cement test;
(20) prepare the glued and acoustic response experiment of next cement sheath.
Technique effect is as follows:
For given water/binder ratio and different curing times, by measuring cement stone compressive strength, cement sheath interface cementing strength and corresponding acoustic logging response under different curing and maintenance pressure condition, study the relation between cement stone compressive strength under the different curing conditions, cement sheath interface cementing strength and the acoustic logging response.
Description of drawings
Fig. 1 is the structural representation of cement interface shearing in annulus supersonic ultrasonic testing instrument;
Fig. 2 is the temperature of cement conservation phase measuring instrument internal and the functional arrangement of pressure;
Fig. 3 is the test curve of cement sheath cementing strength test phase.
The specific embodiment
As shown in Figure 1, the preferred embodiment of cement interface shearing in annulus supersonic ultrasonic testing instrument comprises fuel tank 10, oil pump 8, and fuel tank 10 and oil pump 8 are connected by pipeline.Be provided with loam cake 3 on the top of pressure vessel 11, loam cake 3 is provided with loam cake through hole 15.The inside of pressure vessel 11 is provided with outer layer sleeve 2, is provided with inner layer sleeve 1 in the inside of outer layer sleeve 2, and the height of inner layer sleeve 1 is lower than outer layer sleeve 2.The bottom of pressure vessel 11 is provided with piston 7, and the bottom of the top of piston 7 and inner layer sleeve 1 contacts, and the bottom of piston 7 is provided with push action cylinder 6, and piston obtains thrust upwards by push action cylinder 6.Push action cylinder 6 is provided with push action cylinder hole 14 at side, by pipeline this push action cylinder hole 14 is connected with oil pump 8.Pressure vessel 11 is provided with pressurization hole 12 on the top of sidewall, be connected with oil pump 8 by the pipeline hole 12 of should pressurizeing.The inside of inner layer sleeve 1 is provided with acoustic measurement instrument 4, and acoustic measurement instrument 4 is connected with computer 9 by circuit, and oil pump 8 obtains control signal by computer 9.
There is shelves difference problem in the acquisition precision of sound wave amplitude measurement.But attenuation rate is measured the problem that can avoid sound wave amplitude measurement shelves difference.As long as the amplitude measurement precision of nearly waveform and waveform far away is enough high, and at same shelves collection and display waveform, the precision that attenuation rate is measured is just enough high.The short space R1 that the restriction of the internal tank size that is stressed, the inside of inner layer sleeve 1 are provided with acoustic measurement instrument 4 is designed to 140mm, and long space R2 is 260mm.
For regulate or simulated pressure container 11 in the temperature of cement paste 5, in pressure vessel 11, be provided with heating plate, utilize heating plate that fluid and cement pastes in the pressure vessel 11 are heated.
It is good again to seal, and also has pressure leakage inevitably.As time goes on, the pressure in the pressure vessel 11 also can descend gradually.In addition, because the excessive phenomenon of 11 pressure in the pressure vessel often appears in hysteresis quality and inertia that temperature is transmitted in the process of heating.So it is very necessary on the device stable hydraulic system being installed.When hydraulic coupling descended 100psi again on target maintenance pressure-based, the automatic primer fluid press pump pressurization of program control system was added to till the target maintenance pressure always; When hydraulic coupling rose 100psi again on target maintenance pressure-based, program control system started the electromagnetic valve pressure release automatically, let out till the target maintenance pressure always.
Cement paste under given temperature and pressure (well depth of simulate given) condition after maintenance a period of time between inner layer sleeve 1 and the outer layer sleeve 2, fixed outer layer sleeve pipe 2, apply a thrust that makes progress with the piston 7 that is positioned at inner layer sleeve 1 bottom to inner layer sleeve 1, measure cement clipping knotting strength with this.Because the exterior surface area of inner layer sleeve 1 is more much smaller than the inner surface area of outer layer sleeve 2, thrust must make inner layer sleeve 1 make shear displacemant and not destroy gluing between cement sheath and the outer layer sleeve 2.
Shielding cover prevents that in the outside of pressure vessel 11 fluid from directly releasing from pressure vessel 11, when the hydraulic coupling in the pressure vessel 11 was higher than experiment setting pressure value 100psi, electromagnetic valve was opened plug hole 13 automatically and carried out pressure release.
The important technological parameters of this preferred embodiment is as follows:
1, high workload hydraulic coupling: 5000psi (35Mpa, or 350atm.);
2, maximum operating temperature: 80 ℃;
3, attenuation rate is measured spacing: 120mm;
4, piston 7 maximum thrusts: 80000kg;
5, cement conservation phase temperature fluctuation: ± 2 ℃;
6, cement conservation phase hydraulic pressure fluctuates: ± 100psi (± 0.69Mpa, or ± 6.9atm.);
7, interface shear strength testing period hydraulic pressure fluctuates: ± 100psi (± 0.69Mpa, or ± 6.9atm.);
8, the maximum vertical temperature difference in the pressure vessel: ± 2 ℃;
9, the highest heating rate in the pressure vessel: 1.5 ℃/min.;
10, clipping knotting strength Measuring Time: 10sec.～2min.;
11, design maximum interface shear strength: 1000psi (7Mpa, or 70atm.);
12, transmitting transducer frequency (in clear water): 40kHz;
13, inner layer sleeve 1 external diameter (OD): 2-7/8 " (73mm);
14, inner layer sleeve 1 internal diameter (ID): 57.4mm;
15, inner layer sleeve 1 wall thickness: 0.3079 " (7.8mm);
16, inner layer sleeve 1 length: 380mm;
17, outer layer sleeve 2 external diameters (OD): 5 " (127mm);
18, outer layer sleeve 2 length: 400mm;
19, the specified bearing capacity of bursting disk: 6000psi (42Mpa, or 420atm.)
20, hydraulic coupling: 8000psi (56.2Mpa, or 562atm.) in the container during system cut-off;
21, the temperature-time sample rate of cement conservation phase: 1 time/sec.;
22, the pressure time sample rate of cement conservation phase: 1 time/sec.;
23, interface shear strength testing period thrust time sampling rate: 0.055 time/sec..
Cement interface clipping knotting strength and waterpower cementing strength have equivalent action, all can be used to reflect the bond of cement and sleeve pipe.Because the CBL well logging utilizes the bonding quality that the most responsive casing wave of interface shear strength is detected cement and sleeve pipe, thereby the relation between research CBL log response and the clipping knotting strength is highly significant.
The clipping knotting strength equals the ratio of peak value thrust and bushing outer surface (being sleeve pipe-cement sheath contact area).
This experiment utilization places monopole sound source and the single-emission and double-receiving acoustic measurement device on the borehole axis, measures the slide wave attenuation rate on the inner layer sleeve 1, with well logging of the CBL under this simulation well and SBT well logging.
The condition that experimentizes under the experiment size situation different with real size is that the geometric parameter of various experimental models and physical parameter must satisfy similarity criterion.
Casing and cementing circle learns that by experiment the clipping knotting strength is almost irrelevant with the size of sample.So, measure for the cement sheath clipping knotting strength of this research, to carry out the cementing strength experiment be feasible with dwindling model.
On the other hand, also to consider the situation of acoustic measurement in dwindling model.In acoustic theory, similarity criterion can be expressed with following formula:
Wherein, M
vBe the ratio of model well with the velocity of sound of real well;
M
rBe the ratio of model well with the radius of real well;
M
λRatio for the wave length of sound in model well and the actual well.
The velocity of sound of model well is consistent with the velocity of sound of real well, i.e. M
v=1.The ratio of getting model well and the radius of real well is about M
r=0.5, so, consistent for guaranteeing acoustic measurements with measurement result under the real well, promptly reach M=1, the ratio M of model well and the wave length of sound of real well should be arranged
λ=0.5.The relational expression of wave length of sound λ, frequency of sound wave f and SVEL v is:
Because the acoustic medium in the sound wave route of transmission is identical, velocity of sound v equates, for making M
λ=0.5, will make the model well and the ratio of the frequency of real well is 2.Actual and middle CBL well logging sound wave frequency is 20kHz, thereby the frequency of sound wave in the model well should be 40kHz.In order to solve spacing contradiction, take the single-emission and double-receiving sonic system to measure the way of acoustic attenuation rate.
The restriction of the internal tank size that is stressed, short space (T-R1 among Fig. 1) is designed to 140mm, and long space (T-R2) is 260mm.
On the basis of above-mentioned cement interface shearing in annulus supersonic ultrasonic testing instrument, method of testing is as follows:
1, inner layer sleeve 1 and outer layer sleeve 2 is vertical and be placed on one heart in the pressure vessel, be coated with the last layer butter in the bottom of pressure vessel, place a thin layer dividing plate again.
1, requires preparation cement paste 5 according to cement formula.
Cement type: good magnificent G level (high anti-);
Water quality: Tanggu tap water;
Admixture kind and volume: TD-80 (1.5%), TD-801 (0.15%);
Water/binder ratio: 0.44.
2, cement paste 5 is injected in the annular space between the two-layer sleeve pipe carefully, notice preventing that cement paste 5 from pouring in the inner layer sleeve 1 or outside the outer layer sleeve 2, annotate the height of appointment always.
3, place the thin layer dividing plate at the annular space cement top, prevent that the water on it from mixing with cement paste.
4, in inner layer sleeve 1 and outside the outer layer sleeve 2, pour water, pressure vessel is filled always.
5, in inner layer sleeve 1, settle the acoustic measurement instrument vertically, with one heart.
6, the loam cake 3 of lid compaction forces container is continued to pour water in pressure vessel by the loam cake through hole on the loam cake 3 15, and stirs an emitter edge with screwdriver or other object at the top of container on one side, up to the air at pressure vessel top is all drained.
7, connect heat power circuit and all temperature, pressure sensor and acoustic measurement circuit.
8, connect power supply.
9, start computer and enter WINDOWS95.
10, pressure vessel is heated.
When 11, temperature is near set-point by the time,, hydraulic pressure is brought up to set-point to pressure vessel inside pumping liquid.
12, carrying out first sound measures.
Measure following parameter: casing wave then, E1 peak-to-peak amplitude, E2 peak-to-peak amplitude and E3 peak-to-peak amplitude.
13, press F2 on keyboard, cement paste 5 enters the constant temperature and pressure maintenance stage, computer controlled automatic pressure vessel temperature inside and hydraulic coupling.
The temperature control of computer at first, is described.
The temperature rising speed that cement paste is waited when beginning with fixed attention is the Simulated Water mud speed that temperature raises in the flow process in well, needs to consider heating rate and heat conduction and convection current.
(1) heating rate
A, cement paste be the flowing velocity V in sleeve pipe in pumping into well the time;
The geothermal gradient T of B, locality.
The geothermal gradient of Tarim Basin is generally T=2.1 ℃/100 meters, and establishing the flowing velocity of cement paste in well is 72 meters/minute (i.e. 1.2 meter per seconds), and then the heating rate of pressure vessel inner fluid should be t=T * V=(2.1 * 72)/100=1.51 ℃/minute.
(2) heat conduction and convection current
Utilize heating plate to fluid in the pressure vessel and cement paste heating.In container, radiation of heat is very little, can ignore.Heat mainly transmits in the mode of conduction and convection current.
In the initial temperature rise period, heat begins radially to conduct from outside to inside from container outer surface, and the conduction order is the water in pressure vessel outer wall, outer layer sleeve 2 water, outer layer sleeve 2, cement paste 5, inner layer sleeve 1 and the inner layer sleeve 1 outward.But in the thermostatic curing stage, heat constantly outwards scatters and disappears, if do not heat, directly making progress from the inside to the outside, temperature successively reduces.Because temperature conduction has very big inertia, internal and external temperature just always has a time difference.Strictly speaking, container axially on temperature also be unbalanced.This just requires to heat and carries out according to certain procedure.For this reason, load onto temperature pick up in three positions, upper, middle and lower of container respectively, utilize program control mode of heating to make the interior maximum temperature difference of container again, and the difference of each point temperature and target curing temperature is less than 2 ℃ less than 2 ℃.
On the other hand, convection current takes place in heat in the axial direction, hydro-thermal person's rising that lightens, and colder person sinks.So heating plate distribution in the vertical should be unbalanced, power ratio top, bottom is much bigger.
Be isolation layer outside the heating plate, it and outmost stainless steel outer sleeve constitute the external protection of pressure vessel together.Considerably less by this topping to extraradial heat.But the two ends of pressure vessel can't be heat insulation, and a large amount of heats from then on (especially upper end) scatter and disappear.Therefore, need in the process of cement conservation, follow procedure control start heating plate, to replenish dispersed heat.
Next, the control of computer to pressure is described.
(1) principle of boosting
Filled water, primer fluid press pump when needs boost in the pressure vessel during experiment beginning.Because the water compressibility is very little, so the hydraulic oil that adds in container seldom can make its pressure rising bigger.The hydraulic oil addition is decided on the difference of current pressure and given target maintenance pressure.The difference of pressure is big more, and added oil is just many more.
(2) principle of stabilized voltage
It is good again to seal, and also has pressure leakage inevitably.As time goes on, the pressure in the container also can descend gradually.In addition, because the excessive phenomenon of container inner pressure often appears in hysteresis quality and inertia that temperature is transmitted in the process of heating.So it is very necessary on the device stable hydraulic system being installed.When hydraulic coupling descended 100psi again on target maintenance pressure-based, the automatic primer fluid press pump pressurization of program control system was added to till the target maintenance pressure always; When hydraulic coupling on target maintenance pressure-based during rising 100psi, program control system starts the electromagnetic valve pressure release automatically, lets out till the target maintenance pressure always.
Under " cementing strength test " pattern of system, hydraulic pump turns to and promotes to move on the piston, and system's maximum thrust can reach 80 tons.
The design of pressure vessels maximum working pressure is 5000psi; When the hydraulic coupling in the container was higher than experiment setting pressure value 100psi, electromagnetic valve was opened pressure release automatically; When hydraulic pressure surpassed 7000psi, system cut off the power supply automatically; When hydraulic pressure surpasses 6000psi, the bursting disk explosion, drain passage heavy caliber immediately is unimpeded, thus pressure release immediately.
14,, carry out an acoustic measurement every about 2 hours.
15, when cement has reached given intensity, carry out an acoustic measurement again.
16, press F3 on keyboard, system enters the cementing strength test phase.
17, after the cementing strength test finishes, carry out acoustic measurement for the last time.
18, analyze the various real time record curves that experiment obtains.
Following condition:
1. the temperature and pressure in cement conservation stage reaches set-point, and fluctuation range is up to specification;
2. the hydraulic pressure curve of cement strength test phase still remains on the pressure given value, and fluctuation range is up to specification;
3. know by inference by the thrust curve and the displacement curve of cement strength test phase, cement sheath really with respect to the internal layer cement sheath taken place tangible displacement (〉=2mm);
4. acoustic measurement is correct.
If above-mentioned condition is set up, so, this Success in Experiment is described.
19, pressure vessel pressure release is heated, hydraulic pressure and acoustic measurement system cut-off;
20, press the computer esc key, return to main menu;
21, the equal pressure container temperature is reduced to manipulable the time, opens pressure vessel, takes out the acoustic measurement instrument, takes out through the fixed inside and outside layer sleeve pipe of cement;
22, water and the drilled cement in the removing pressure vessel;
23, pressure vessel cooling;
24, single shaft strength of cement test;
25, prepare the experiment of next cement sheath gluing and acoustic response.
By experiment, obtained lot of data.
As shown in Figure 2, obtain temperature, the pressure curve of real time record during the cement conservation.
As shown in Figure 3, obtain thrust, displacement, the temperature and pressure curve of interface cementing strength test period real time record.
Test at every turn in the cement conservation process, measure an acoustic response with the acoustic wave apparatus of experiment every a period of time, they are respectively:
Nearly waveform: Mintrop wave propagation time Tn, the 1st posivtive spike A1n, the 1st negative peak A2n and the 2nd posivtive spike A3n;
Waveform far away: Mintrop wave propagation time Tf, the 1st posivtive spike A1f, the 1st negative peak A2f and the 2nd posivtive spike A3f.
For the cementing intensity experiment, in each experiment, measure piston gross thrust F
t, and read baseline thrust F by thrust curve
b
Claims (6)
1, a kind of cement interface shearing in annulus supersonic ultrasonic testing method comprises the steps:
The cement paste that (1) will dispose in proportion injects between inner layer sleeve and the outer layer sleeve, reaches the height of appointment up to cement paste;
(2) place the thin layer dividing plate at the annular space cement top, prevent that the water on it from mixing with cement paste;
(3) in inner layer sleeve He outside the outer layer sleeve, pour water, pressure vessel is filled always;
(4) in inner layer sleeve, settle the acoustic measurement instrument vertically, with one heart;
(5) loam cake of lid compaction forces container is poured water in pressure vessel by the loam cake through hole continuation of loam cake, up to the air at pressure vessel top is all drained;
(6) connect heat power circuit and all temperature, pressure sensor and acoustic measurement circuit, and connect power supply;
(7) start computer;
(8) pressure vessel is heated, when temperature is near set-point by the time,, hydraulic pressure is brought up to set-point pressure vessel inside pumping liquid;
(9) first sound is measured, the parameter of measurement comprise casing wave then, E1 peak-to-peak amplitude, E2 peak-to-peak amplitude or E3 peak-to-peak amplitude;
(10) cement paste enters the constant temperature and pressure maintenance stage, computer controlled automatic pressure vessel temperature inside and hydraulic coupling;
(11) carry out an acoustic measurement at regular intervals, and when cement has reached given intensity, carry out an acoustic measurement again;
(12) when system enters the cementing strength test phase, carry out the cementing strength test, after test finishes, carry out acoustic measurement again.
2, cement interface shearing in annulus supersonic ultrasonic testing method according to claim 1 is characterized in that, step (1) is specially:
(100) inner layer sleeve is vertical with outer layer sleeve and be placed on one heart in the pressure vessel, be coated with the last layer butter in the bottom of pressure vessel, place a thin layer dividing plate again;
(101) require the preparation cement paste according to cement formula;
(102) cement paste is injected in the annular space between the two-layer sleeve pipe, directly annotate the height of appointment.
3, cement interface shearing in annulus supersonic ultrasonic testing method according to claim 1 is characterized in that, in the step (11), it is corresponding that described acoustic measurement obtains sound wave, corresponding nearly waveform and the waveform far away of comprising of described sound wave.
4, cement interface shearing in annulus supersonic ultrasonic testing method according to claim 1 is characterized in that, further comprises step (13), analyzes the parameter and the real time record curve that obtain.
5, cement interface shearing in annulus supersonic ultrasonic testing method according to claim 4 is characterized in that, in the step (13), the data of described analysis comprise: interface shear strength, curing time or acoustic attenuation rate.
6, cement interface shearing in annulus supersonic ultrasonic testing method according to claim 4 is characterized in that, further comprises:
(14) pressure vessel pressure release is heated, hydraulic pressure and acoustic measurement system cut-off;
(15) press the computer esc key, return to main menu;
(16) the equal pressure container temperature is reduced to manipulable the time, opens pressure vessel, takes out the acoustic measurement instrument, takes out through the fixed inside and outside layer sleeve pipe of cement;
(17) water and the drilled cement in the removing pressure vessel;
(18) pressure vessel cooling;
(19) single shaft strength of cement test;
(20) prepare the glued and acoustic response experiment of next cement sheath.
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