CN107044939A - The experimental provision and method of evaluating cementing concrete slurry system activity self-reparing capability - Google Patents
The experimental provision and method of evaluating cementing concrete slurry system activity self-reparing capability Download PDFInfo
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- CN107044939A CN107044939A CN201611081810.XA CN201611081810A CN107044939A CN 107044939 A CN107044939 A CN 107044939A CN 201611081810 A CN201611081810 A CN 201611081810A CN 107044939 A CN107044939 A CN 107044939A
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- die trial
- interface
- cementing
- cementing strength
- evaluating
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
- G01N19/04—Measuring adhesive force between materials, e.g. of sealing tape, of coating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
The present invention relates to a kind of experimental provision of the active self-reparing capability of evaluating cementing concrete slurry system and method, its device includes interface cementing strength die trial, framework, upper platen, pressure head and pressing disc, the pressing disc is arranged on the bottom of framework, the interface cementing strength die trial lower end is placed on pressing disc, the upper end of the interface cementing strength die trial is provided with pressure head, the upper platen is fixed on the top of framework, and upper platen is located at the top of pressure head；The present invention tests the maximum anti-shearing force of pressure-off Behavior of Hardened Cement Paste after maintenance by forcing press, then is conserved under given conditions with the die trial, tests the maximum anti-shearing force of secondary pressure-off Behavior of Hardened Cement Paste；Interface cementing strength recovery rate is calculated according to this, and the ability of the active selfreparing of evaluating cementing concrete slurry system is carried out with this.The present invention can be with the ability of convenient and swift, objective reality evaluating cementing concrete ring self-healing microcrack and microannulus under active medium environment, and the research for the secondary sealing technology of cementing slurry provides scientific method and reliable method.
Description
Technical field
The present invention relates to a kind of experimental provision of the active self-reparing capability of evaluating cementing concrete slurry system and method.
Background technology
The exploitation of the unconventionaloil pools such as shale oil gas is the most noticeable energy revolution in the whole world, fractured horizontal well in recent years
Transformation reservoir is the key means and core technology of shale gas Efficient Exploration exploitation.Pipe cleaning, brill are filled in, penetrated during underground work
Hole and fracturing reform easily make cement sheath produce microcrack or microannulus, cause cement sheath mechanical integrity and hydraulic seal to lose
Effect, oil gas is altered to ground on the crack along this casing annulus, causes annular space problem with pressure to frequently occur, even result in and spend huge
The Oil/gas Well that money is set up is scrapped.
For solve well cementation after has channeling and annular space problem measure with pressure is less and cost is high, for this problem, from water
Mudstone angle itself is set out, and research can make the mortar architecture of self sealing microcrack of cement sheath or microannulus be domestic and international at present
Study hotspot.Without ground artificial intervention when microcrack and microannulus can occur in cement sheath in active selfreparing cement mortar, when
Hydrocarbon stratum is in crossflow, and hydrocarbon reacts Triggered Activity material, automatic plugging fluid-channeling channel, recovers water
The integrality and interface agglutination ability of mud ring, reaching prevents has channeling and annular space purpose with pressure.
Lack the evaluation method and detection means of effective selfreparing cement mortar both at home and abroad at present, scene can only pass through
Traditional observation wellheadpressure phenomenon carrys out the selfreparing effect of indirect verification selfreparing cement mortar；And laboratory experiment method is numerous,
Respectively there is the evaluation method of oneself in domestic and international each research unit, for example, recovered by intensity recovery capability, cementing recovery capability, infiltration
Ability and throughput etc. evaluate the self-reparing capability of cement sheath, achieve certain achievement in research, but can not be formed and make industry recognize
Same unified evaluation criterion.Therefore it is badly in need of a kind of simple, economic, scientific and effective evaluating apparatus of research and development and method to evaluate cement
The laboratory facilities of self-reparing capability are starched, are preferably to review one's lessons by oneself rehydration so as to the selfreparing effect of the evaluation mortar architecture of quantization
The research service of mud.
The content of the invention
The technical problem to be solved in the present invention is to consolidate there is provided evaluation a kind of easy to operate, simple in construction, reproducible
The experimental provision and method of cementing slurry for well system activity self-reparing capability.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of evaluating cementing concrete slurry system activity
The experimental provision of self-reparing capability, including interface cementing strength die trial, framework, upper platen, pressure head and pressing disc, the pressing disc
The bottom of framework is arranged on, the interface cementing strength die trial lower end is placed on pressing disc, the interface cementing strength die trial
Upper end is provided with pressure head, and the upper platen is fixed on the top of framework, and upper platen is located at the top of pressure head, the upper platen and pressure
Test machine is connected, and the interface cementing strength die trial includes emulation sleeve pipe and the cementing Behavior of Hardened Cement Paste in the emulation inside pipe casing
Post.
In such scheme, in addition to fluid sealant and diaphragm seal, the emulation sleeve pipe, fluid sealant and diaphragm seal composition interface glue
Knotting strength die trial preparation facilities, when preparing interface cementing strength die trial, the one of emulation sleeve pipe is blocked by diaphragm seal and fluid sealant
End.
Present invention also offers a kind of method of the active self-reparing capability of evaluating cementing concrete slurry system, evaluated using described
The experimental provision of well cementing mortar architecture activity self-reparing capability, it is characterised in that comprise the following steps：
S1, prepare interface cementing strength die trial；
S2, interface cementing strength die trial are inverted on pressing disc, and pressure head is placed in die trial upper end, smooth placement placed in the middle；
Deceleration uniform load load after S3, setting pressure testing machine test gear and speed, upper platen contact pressure head；
S4, until cement stone column departs from emulation sleeve pipe cementation interface, draw the maximum anti-shearing force of die trial, calculating is obtained just
Secondary interface cementing strength pf；
After the die trial certain time that cementation interface departs from S5, curing step S4, repeating said steps S2-S4 draws two
Secondary interface cementing strength ps；
S6, the interface cementing strength recovery rate α by below equation calculating cementing slurry：
In the above method, the step S1 further comprises：
S11：The unitary mould of sleeve pipe, fluid sealant and diaphragm seal formation semitight is emulated, interface agglutination die trial mould is made；
S12：A certain amount of cement slurry samples pour into the maintenance gelling solidification under specified temp and ambient condition in mould, are formed
Interface agglutination die trial；
S13：Fluid sealant and diaphragm seal are removed, interface cementing strength die trial test sample is formed.
Implement the experimental provision and method of the active self-reparing capability of evaluating cementing concrete slurry system of the present invention, with following
Beneficial effect：
Cement sheath and sleeve pipe or the interface agglutination on stratum, are tested by forcing press in apparatus of the present invention energy analogue simulation pit shaft
The maximum anti-shearing force of pressure-off Behavior of Hardened Cement Paste after maintenance, at the same time in cementation interface formation artificial cement's microcrack；By cementing
Interface force analysis draws interface cementing strength calculation formula, draws the interface cementing strength of cement stone column and emulation sleeve pipe；Can
Maximum anti-shearing force is tested again after simulation different medium (oil, gas or water) maintenance, and the first of cementing slurry is calculated respectively
Secondary interface cementing strength and secondary interface cementing strength, and can show that the cement slurry is tied up under particular medium curing condition according to this
Interface cementing strength recovery rate；The interface cementing strength recovery rate mechanics evaluation method has convenient and swift, repeatable strong
The characteristics of, the energy of energy science objective appraisal cementing concrete ring self-healing microcrack and microannulus under oil gas medium environment
Power.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is that interface agglutination die trial prepares schematic diagram；
Fig. 2 is interface cementing strength test device schematic diagram.
Embodiment
In order to which technical characteristic, purpose and effect to the present invention are more clearly understood from, now compare accompanying drawing and describe in detail
The embodiment of the present invention.
As shown in Figure 1 and Figure 2, the experimental provision of the active self-reparing capability of evaluating cementing concrete slurry system of the present invention, including boundary
Face cementing strength die trial, framework 5, upper platen 6, pressure head 7, pressing disc 8, fluid sealant 4 and diaphragm seal 3.
Pressing disc 8 is arranged on the bottom of framework 5, and interface cementing strength die trial lower end is placed on pressing disc 8, and interface agglutination is strong
The upper end for spending die trial is provided with pressure head 7, and upper platen 6 is fixed on the top of framework 5, and upper platen 6 is located at the top of pressure head 7, upper platen 6
It is connected with pressure testing machine, interface cementing strength die trial includes emulation sleeve pipe 1 and the cementing cement stone column inside emulation sleeve pipe 1
2。
Sleeve pipe 1, fluid sealant 4 and the composition interface cementing strength die trial preparation facilities of diaphragm seal 3 are emulated, interface agglutination is prepared strong
When spending die trial, one end of emulation sleeve pipe 1 is blocked by diaphragm seal 3 and fluid sealant 4.Based on emulating sleeve pipe 1 and diaphragm seal 3
Simple mould system, constructs a kind of experiment maintenance die trial for evaluating selfreparing cement stone interface cementing strength recovery capability.
Present invention also offers a kind of method of the active self-reparing capability of evaluating cementing concrete slurry system, it passes through cementing boundary
Face force analysis draws interface cementing strength theoretical model and calculation formula, draws the interface cementing strength of well cementing mortar architecture
Recovery rate evaluation method, so as to can convenient, macroscopical, real evaluating cementing concrete ring self-healing under oil gas medium environment it is micro-
Crack and the ability of microannulus.Comprise the following steps that：
(1) when needing to prepare interface agglutination die trial, the unitary mould of emulation sleeve pipe and diaphragm seal one semitight of formation, one
Gauge water mud sample pours into maintenance gelling in mould and solidify to form interface agglutination die trial.The emulation sleeve pipe is added by seamless steel pipe
Work is formed, and steel pipe sizes need selection (for example according to experiment：External diameter 55mm, internal diameter 51mm, highly between 80~90mm), protect
Demonstrate,prove inwall and end face is smooth；For simulation cementing operation well full-scale condition, more than drilling fluid 24h need to be soaked in advance, poured into
Rinsed well before cement mortar；The cement stone column is conserved gelling solidification by test cement mortar under specified temp and ambient condition
Form；The cement mortar is formed by the concrete grey and medicine water high-speed stirred of certain ratio of mud, first in constant speed stirrer
4000r/min stirring at low speed 15s, then 12000r/min high-speed stirreds 35s, it is ensured that stirring is abundant, cement mortar is overall after pouring into be moved
Enter curing box, it is ensured that in overall submergence maintenance medium, 24h is conserved under the conditions of simulation well temperature；The fluid sealant selects high temperature resistance
Adhesive property is excellent and is easy to the high temperature lithium saponify of later stage removing, and main function is sealing emulation sleeve pipe and diaphragm seal, prevents water
Missed during mud gel hardening；The diaphragm seal is formed by ordinary plate glass cutting, and size is 80mm*80mm*5mm.
(2) when needing test interface cementing strength, the die trial sample of maintenance certain time is naturally cooled to after room temperature, is measured
Behavior of Hardened Cement Paste pillar height degree h, is positioned on pressure testing machine by Fig. 2, and upper platen, to pressure head uniform load load, is born with low speed when loading
Lotus, which reaches, stops test after peak value, cement stone column and emulation sleeve pipe occur it is relative slide, cement plane is destroyed formed microcrack and
Microannulus, this peak value is the maximum anti-shearing force F that cementation interface is born.The frame system is full-automatic constant stress cement pressure
A force tester part, overall mechanical support is provided for pressure testing machine；The upper platen is cement pressure tester hydraulic pressure system
A part for system, at the uniform velocity loading and load can keep control, pilot strength measurement scope 8kN-300kN；The pressing disc is cement
A part for pressure test machine hydraulic system, but power is not provided, there is various sizes of pressing disc to change, according to test die trial
The diameter and height of size and piston stroke selection pressing disc；The pressure head is to be processed according to die trial size by steel, on
Portion's diameter is less than lower diameter, and lower diameter is to be slightly less than die trial internal diameter as standard；The interface cementing strength die trial is by cement
The diaphragm seal and fluid sealant that mould is removed after slurry gelling solidification are formed, and are stood upside down and are placed during test cementing strength, enough to have
Test pushes space.
(3) cementing strength restorability is evaluated
Interface agglutination die trial is mainly made up of emulation sleeve pipe, cement stone column and cementation interface, during test to cement pillar by
Gradually apply load, after loading force reaches certain phase, the meeting cementing plane of weakness of preferential destruction, between cement stone column and emulation sleeve pipe
Cementation interface occur it is relative slide, this peak value is maximum anti-shearing force F.
Inferred according to destruction interface force analysis and show that cement stone column is with emulation ferrule interface cementing strength calculation formula：
In formula：F is maximum anti-shearing force, and unit is N；D is emulation casing inner diameter, and unit is mm；H is Behavior of Hardened Cement Paste pillar height
Degree, unit is mm；My interface cementing strengths of P, unit is Pa；
Artificial cement's microcrack and microannulus are formed while pressure-off Behavior of Hardened Cement Paste at cementation interface, then by die trial with difference
After medium (formation oil, gas or water under simulation wellbore hole physical condition) maintenance certain time, maximum anti-shearing force F is tested agains。
First interface cementing strength and secondary interface cementing strength, therefore the interface glue of cementing slurry are calculated by above-mentioned formula
Knotting strength recovery rate is：
In formula：α is interface cementing strength recovery rate, and unit is %；psFor secondary interface cementing strength, Pa；pfFor first boundary
Face cementing strength, unit is Pa；
Embodiments of the invention are described above in conjunction with accompanying drawing, but the invention is not limited in above-mentioned specific
Embodiment, above-mentioned embodiment is only schematical, rather than restricted, one of ordinary skill in the art
Under the enlightenment of the present invention, in the case of present inventive concept and scope of the claimed protection is not departed from, it can also make a lot
Form, these are belonged within the protection of the present invention.
Claims (4)
1. the experimental provision of the active self-reparing capability of a kind of evaluating cementing concrete slurry system, it is characterised in that including interface agglutination
Intensity die trial, framework, upper platen, pressure head and pressing disc, the pressing disc are arranged on the bottom of framework, the interface cementing strength
Die trial lower end is placed on pressing disc, and the upper end of the interface cementing strength die trial is provided with pressure head, and the upper platen is fixed on framework
Top, upper platen is located at the top of pressure head, and the upper platen is connected with pressure testing machine, the interface cementing strength die trial bag
Include emulation sleeve pipe and the cementing cement stone column in the emulation inside pipe casing.
2. the experimental provision of the active self-reparing capability of evaluating cementing concrete slurry system according to claim 1, its feature exists
In, in addition to fluid sealant and diaphragm seal, the emulation sleeve pipe, fluid sealant and diaphragm seal composition interface cementing strength die trial prepare dress
Put, when preparing interface cementing strength die trial, one end of emulation sleeve pipe is blocked by diaphragm seal and fluid sealant.
3. the method for the active self-reparing capability of a kind of evaluating cementing concrete slurry system, using described in claim 1-2 any one
The experimental provision of evaluating cementing concrete slurry system activity self-reparing capability, it is characterised in that comprise the following steps：
S1, prepare interface cementing strength die trial；
S2, interface cementing strength die trial are inverted on pressing disc, and pressure head is placed in die trial upper end, smooth placement placed in the middle；
Deceleration uniform load load after S3, setting pressure testing machine test gear and speed, upper platen contact pressure head；
S4, until cement stone column departs from emulation sleeve pipe cementation interface, draw the maximum anti-shearing force of die trial, calculating obtains first boundary
Face cementing strength pf；
After the die trial certain time that cementation interface departs from S5, curing step S4, repeating said steps S2-S4 draws secondary boundary
Face cementing strength ps；
S6, the interface cementing strength recovery rate α by below equation calculating cementing slurry：
4. the method for the active self-reparing capability of evaluating cementing concrete slurry system according to claim 3, it is characterised in that institute
Step S1 is stated to further comprise：
S11：The unitary mould of sleeve pipe, fluid sealant and diaphragm seal formation semitight is emulated, interface agglutination die trial mould is made；
S12：A certain amount of cement slurry samples pour into the maintenance gelling solidification under specified temp and ambient condition in mould, form interface
Cementing die trial；
S13：Fluid sealant and diaphragm seal are removed, interface cementing strength die trial test sample is formed.
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| CN201611081810.XA CN107044939A (en) | 2016-11-30 | 2016-11-30 | The experimental provision and method of evaluating cementing concrete slurry system activity self-reparing capability |
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| CN201611081810.XA CN107044939A (en) | 2016-11-30 | 2016-11-30 | The experimental provision and method of evaluating cementing concrete slurry system activity self-reparing capability |
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Cited By (2)
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| NO20191422A1 (en) * | 2019-12-02 | 2021-06-03 | Restone As | A shear bond strength sample preparation device, a shear bond strength test sample, a shear bond strength sample testing system, and a method of testing shear bond strength of a test sample in shear bond strength sample testing system. |
| CN113324886A (en) * | 2021-04-20 | 2021-08-31 | 中海油能源发展股份有限公司 | Experimental evaluation device and method for damage of cement paste to reservoir |
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Application publication date: 20170815 |