CN108590601A - A kind of water filling dilatation expansion preferred experimental method of construction parameter - Google Patents
A kind of water filling dilatation expansion preferred experimental method of construction parameter Download PDFInfo
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- CN108590601A CN108590601A CN201810306768.XA CN201810306768A CN108590601A CN 108590601 A CN108590601 A CN 108590601A CN 201810306768 A CN201810306768 A CN 201810306768A CN 108590601 A CN108590601 A CN 108590601A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
Abstract
The present invention discloses a kind of water filling dilatation expansion preferred experimental method of construction parameter, including, S1：Reservoir rock physical property and mechanics parameters test；S2：Artificial rock prepares and test；S3：Prepare the artificial rock for meeting simulation exploitation scene；S4：The formation condition of rock sample restores；S5：The simulation in rock sample contaminated zone and small-sized dilatation expansion test；S6：The foundation of dilatation test result analysis and dilatation expansion equation；S7：The plane of fracture after dilatation（Microcrack）Microscopic pattern is tested；S8：Establish loose sand reservoir dilatation expansion mathematical model and numerical model.The method that the present invention is combined by the simulating lab test of formation condition with the numerical simulation of temperature seepage liquefaction, ess-strain and permeability variation of the simulation Different Strata under different injection conditions.The mathematical model between injection parameter and rock strain, porosity, permeability is established, fast and easy accurately provides optimum optimization scheme and theoretical foundation for loose sand water filling dilatation construction.
Description
Technical field
The present invention relates to petrol resources exploitation field, especially a kind of water filling dilatation expands the construction parameter preferably side of experiment
Method.
Technical background
Petroleum resources in the world about 70% are distributed in sandstone formation, such stratum is the sea in China and land point
Cloth range is wide, and reservoir reserve is big, and yield index occupies an important position in oil-gas field development.Sandstone oil reservoir has unique geology
Often there is sand plug phenomenon in transitivity feature, and to cause the decline of near wellbore permeability, and then oil well output is by shadow
It rings.Particularly, for China sea sandstone oil reservoir, easily there is sand plug phenomenon in most wells recovery process, oil/gas well is endangered
Greatly, the oil well underproduction or halt production operation or even oil well is caused to scrap.Sand plug have become influence oil reservoir production capacity outstanding problem it
One.
Water filling dilatation construction is to alleviate a solution of sand plug, reaches the mesh for alleviating flour sand in well week blocking pollution
, while water filling dilatation can generate microcrack near stratum, to improve reservoir properties and prevent anti-layer of sand from polluting, and then can be with
Improve production capacity.But deficiency is probed into dilation by water injection dilatation experiment in the prior art, can not accurately predict Different Strata condition
Under optimal water injection parameter, more without for dilatation parameter determination optimization analyze, lead to not obtain science and practicality
Model and result come instruct water filling dilatation construct.
Invention content
To solve the above problems, the present invention is achieved through the following technical solutions, a kind of water filling dilatation expansion construction parameter
Preferred experimental method, includes the following steps：S1：The test that mechanical property transitivity parameter is carried out to reservoir rock, obtains institute
State granularmetric composition distribution curve, porosity, permeability, load-deformation curve and the elastic parameter of rock；S2：It prepares and institute
State the most identical artificial rock of reservoir rock property；S3：Prepare in multiple S2 the artificial rock of gained, and by multiple artificial rocks
It is divided into several groups, every group includes two artificial rocks, and a wellbore, tripping in simulation set are bored in the kernel of section of the artificial rock
Pipe, for simulating exploitation scene；S4：The simulation test of formation condition and contaminated zone is carried out to the artificial rock of gained in S3；
S5：Water filling dilatation is carried out to the artificial rock of gained in S4 and expands simulation laboratory test, obtains the best water filling ginseng of dilatation
Number；
S6：It analyzes the result of the water filling dilatation expansion simulation laboratory test and establishes dilatation equation；S7：To the water filling dilatation
The plane of fracture formed after expansion simulation laboratory test carries out microscopic pattern observation experiment and analysis；S8：According to the rock expansion
Dilatation equation and plane of fracture microscopic pattern observe analysis of experiments result, establish mathematical model, and as establishing numerical model
Theoretical direction.
Further, the step specifically includes following content：
S1：The test of reservoir rock mechanical property transitivity parameter.The granularity of experimental test target zone rock sample obtains granularmetric composition
Distribution curve.Test measurement rock sample porosity, permeability, and to target zone rock sample carry out list/triaxial shear strength experiment with
Uniaxial tensile strength is tested.By testing obtained load-deformation curve, analysis obtains the elastic parameter of reservoir rock（Including
Elasticity modulus, Poisson's ratio, compression strength, residual strength, bulk strain, dilatation rate, dilative angle, internal friction angle, cohesive force, shearing resistance
Intensity etc.）；
S2：Prepare the artificial rock most identical with the reservoir rock property.Gained granularmetric composition distribution curve in foundation S1,
Prepare the rock sample of multigroup various granularity quartz sand difference accountings.The physical parameter and mechanical property of the made rock sample of experimental test are joined
Number, including the porosity of rock sample, permeability, load-deformation curve and elastic parameter, respectively with surveyed reservoir rock physical property in S1
Parameter and mechanical property parameter compare.Analysis obtains one group of quartz sand particle grain size accounting most identical with reservoir rock physical property
Situation.
S3：Prepare the artificial rock for meeting exploitation scene.It is matched using identified best quartz sand particle grain size in S2,
Prepare multigroup same nature rock sample.A Microdrilling is bored in rock sample kernel of section, tripping in analog casing is equal in analog casing bottom
The even true stratum preforation tunnel of borehole simulation.
S4：The formation condition of rock sample and the simulation in contaminated zone.For the purpose of rock sample top cross-section injected clear water, injection pressure
Layer pore pressure, is always maintained at pore pressure to off-test.Meanwhile formation temperature is set for rock sample.It simulates in rock sample contaminated zone
It is the flour sand mixture fluid that is marked with radioactive tracer to simulate every group two in four groups of same nature rock samples
The different situation of rock sample pollution level.
S5：It carries out water filling dilatation and expands simulation laboratory test.The low flow velocity dilatation indoor simulation of constant pressure is carried out respectively
Circulating water pressure dilatation simulation laboratory test under experiment, the low flow velocity dilatation simulation laboratory test of constant flow rate, different frequency,
Steps are as follows：S51：Into S4, the simulation wellbore of the artificial rock of gained carries out water injection test, and the experiment is respectively different
It is carried out under water injection parameter, the water injection parameter includes water injection pressure, injection flow and water injection frequency；S52：According to artificial rock
Ess-strain and permeability analyze best water injection pressure, best injection flow and best note and adopt time ratio.Wherein, different frequencies
Circulating water pressure dilatation simulation laboratory test under rate is respectively under conditions of the best water injection pressure and best injection flow
It carries out.
S6：The interpretation of result of dilatation expansion test and the foundation of dilatation equation.Continuous record three classes dilatation expansion test as a result,
Dilatation expansion test result is analyzed, determines the matching relationship between injection parameter and rock stress-strain, permeability,
The equation under the conditions of rock expansion dilatation is established, basic theory guidance is provided for the foundation of mathematical model.
S7：The plane of fracture after dilatation expansion（Microcrack）Microscopic pattern is tested, and profit is computerizedd control X-ray layer scanning technology
The dilatation area size after rock sample internal structure and different pollution level rock sample tests after three classes dilatation experiment is observed, microcrack is obtained
A series of observations such as visual description of form, position to test result as a result, and be compared analysis.
S8：Establish loose sand reservoir water filling dilatation expansion mathematical model and numerical model.According to rock expansion dilatation side
Journey and plane of fracture microscopic pattern observe analysis of experiments result, establish mathematical model, and as the theory for establishing numerical model
Guidance.The waterpower dilatation numerical model of temperature-seepage-pipe coupling model is established, test result and numerical value model result are compared,
Verification mutually.Finally, application model carries out hydraulic parameters determination to different target zones, by changing injection parameter, calculates and divides
Water filling dilatation distention protocol most preferably is obtained after analysis.
The advantage of the invention is that：
（1）This experimental program is based on the true formation condition of reduction：It is oozed by the simulating lab test and temperature-of formation condition
The method that the numerical simulation of stream-stress coupling is combined, stress-strain of the simulation Different Strata under different injection conditions and oozes
Saturating rate variation so that experimental situation and actual conditions match, and ensure that the accuracy of experimental result；
（2）This experimental program verifies established model using plane of fracture observation experiment：Establish injection parameter and rock
Mathematical model between strain, porosity, permeability seeks specific best water injection pressure, injection flow and note and adopts time ratio,
And go to verify and optimize best injection parameter using the observation experiment of the dilatation plane of fracture, further ensure that the accuracy of model；
（3）This experimental program is in view of the water filling problem in practical exploitation：This programme research is in best water injection pressure and best note
Under water flow, the optimum ratio of injection length and extraction time more meets oil field actual conditions so that experimental model has more in this way
Scientific and practicability.
To sum up, this programme provides best prioritization scheme and theoretical foundation for water filling dilatation construction, can be more convenient quickly
Accurately carry out the loose construction of sandstone.
Description of the drawings
Fig. 1 is the stress-strain curve in the experiment of the present invention；
Fig. 2 is testing rock core die theory figure in the testing equipment of the present invention；
Fig. 3 is the big rock sample illustratons of model of Φ 100mm × 100mm in the experiment of the present invention；
Fig. 4 is three axis rock mechanics test principle figures in the testing equipment of the present invention；
Fig. 5 is the flour sand contamination model figure before dilatation in the experiment of the present invention；
Fig. 6 is axial stress-strain relationship and core permeability-strain curve in the experiment of the present invention；
Fig. 7 is pollution profile figure after dilatation in the experiment of the present invention；
Fig. 8 is the high level lines such as the dilatation plane of fracture in the experiment of the present invention；
Fig. 9 be the present invention experiment in microcrack form, position visual description figure；
Sample granular cementation degree and slit are distributed phenogram in Figure 10-11 respectively experiments of the present invention；
Figure 12 is the sandstone reservoir waterpower dilatation geometrical model figure that the present invention establishes；
Figure 13 is the model calculation part sectional drawing in the present invention；
Figure 14 is the experimental result porosity of the present invention with the change curve of injection length；
Figure 15 be the present invention experiment in different angle effective stress change curve；
Figure 16 is the experiment flow figure of the present invention.
In Fig. 2：The upper clamping disks of 21-, 22- rock core die ontologies, clamping disk under 23-, 24- rock core compression bars；
In Fig. 3：31- analog casings, 32- simulate eyelet；、
In Fig. 4：101- oil storage tanks, 102- axis press pumps, 103- axis pressure control devices, 201- air pressure pumps, 202- air accumulators,
203- constant temperature and pressure devices, 301- pistons, 302- autoclave bodies, 303- air inlets, 304- exhaust outlets, 305- core holding units,
306- self-adhesion bands, the first rubber gaskets of 307-, 308- full-hole cores, 309- rock core mesoporous, the second rubber of 310- are close
Packing, 401- inlet pressures are shown and sensor, and 402 outlet pressures are shown and sensor, 403- precession vortex gas flowmeters,
404- data collecting cards, the output display of 405- data, 501- filters, 502- high temperature roasters, 503- electronic balances；
In Fig. 5：Fine silt blocking strips before 51- dilatations；
In Fig. 6：61- stress-strain diagrams, 62- permeability strain curves；
In Fig. 7：71- microcracks, 72- major fractures, the fine silt blocking strips after 73- dilatations；
In Figure 12：P1-Circumferential pore pressure, P2-Overburden pressure.
Specific implementation mode
A kind of water filling dilatation expansion preferred experimental method of construction parameter, includes the following steps：S1：Reservoir rock is carried out
The test of mechanical property transitivity parameter show that granularmetric composition distribution curve, porosity, permeability, the stress-of the rock are answered
Varied curve and elastic parameter；S2：Prepare the artificial rock most identical with the reservoir rock property；S3：It prepares in multiple S2
The artificial rock of gained, and multiple artificial rocks are divided into several groups, every group includes two artificial rocks, in the artificial rock
Kernel of section bore a wellbore, tripping in analog casing, for simulate exploitation scene；S4：The artificial rock of gained in S3 is carried out
The simulation test of formation condition and contaminated zone；S5：Water filling dilatation expansion indoor simulation examination is carried out to the artificial rock of gained in S4
It tests, obtains the best water injection parameter of dilatation；S6：It analyzes the result of the water filling dilatation expansion simulation laboratory test and establishes dilatation
Equation；S7：The plane of fracture formed after simulation laboratory test is expanded to the water filling dilatation to carry out microscopic pattern observation experiment and divide
Analysis；S8：Analysis of experiments result is observed according to the rock expansion dilatation equation and plane of fracture microscopic pattern, establishes mathematical mould
Type, and as the theoretical direction for establishing numerical model.As shown in figure 16：
S1：The test of reservoir rock physical property and mechanics parameters, steps are as follows for specific experiment：
S11：The rock core that target zone is taken out using coring bit is processed into the small rock sample that several specifications are Φ 25mm × 100mm.
It should be noted that as long as rock sample specification meets the requirement of national standard and experimental facilities, the present invention does not limit rock sample specification
It is fixed.
S12：The processing of small rock sample is ground to the thin slice of about 30 micron thickness, utilizes overlength focal length continuous vari-focus video
Microscope measures the major axis dimension of the individual particle cross section of two-dimensional slice, so that it is determined that the size of rock sample grain size.It paints
Granulation degree component distribution curve is analyzed and determines different grain size particle proportion situation.
S13：Small core porosity and infiltration are measured using Southwest Petrol University's high temperature and pressure rock multi-parameter measurer
Rate records measurement result by computer recorder.
S14：Compressive strength test is carried out to small rock core, it is Φ 25mm that target block reservoir core, which is first processed into specification,
The small rock core of × 100mm, carry out include uniaxial compressive strength and the triaxial shear strength under reservoir Temperature-pressure Conditions experiment.It adopts
System is tested with three axis rock mechanics of RTR-1000 high temperature and pressure, carries out compressive strength test for the small rock core of target block.
S15：To small rock core carry out test for tensile strength, by target block reservoir core be processed into specification be Φ 25mm ×
Then the smooth oblate cylinder of 100mm and both ends carries out Brazilian disk test until sample destroys on three-axis tester.
By two experiments of above S14, S15, load-deformation curve is analyzed, as shown in Figure 1, obtaining elasticity modulus, Poisson
Than, compression strength, residual strength, bulk strain, dilative angle, internal friction angle, cohesive force, the petrophysical parameters such as shearing strength.
S2：The artificial rock most identical with the reservoir rock property is prepared, steps are as follows for specific experiment：
The preparation of rock sample.According to gained granularmetric composition distribution curve in S1, in the particle weight corresponding to each particle diameter section
In the case that amount accounting is constant, the grain diameter composition in each particle size interval is adjusted, multigroup various granularity stones are formed
The case where sand different distributions.Then the rock sample of multigroup various granularity quartz sand difference accountings is prepared.Operation step prepared by rock sample
It is rapid as follows：
The quartz sand of every group of difference accounting is mixed, a certain amount of aluminum phosphate is added according to the basic proportioning of quartz sand and cement
Cementing agent, uniform stirring are then placed in the rock core mold of Φ 25mm × 100mm, as shown in Figure 2.First it is compacted by hand with compression bar,
Then 4.9kN, 5 min of pressure duration are reinforced.It unloads, takes out rock sample drying.After drying, temperature rises to 500 DEG C and is burnt
Knot continues constant temperature 8h.Finally cease fire, Temperature fall in stove.
The determination of quartz sand particle size proportioning.According to the same modes of S1 test the porosity of made every group of rock sample, permeability,
The mechanical properties parameter such as tensile strength, compression strength, physical parameter, the mechanics of experimental results and surveyed reservoir rock in S1
Parameter comparison.Analysis obtains one group of quartz sand most identical with reservoir rock physical property and prepares rock sample, determines the quartz of different-grain diameter
Sand particle optimum proportioning.
S3：Prepare the artificial rock for meeting exploitation scene.It is matched using identified best quartz sand particle grain size in S2,
Prepare multigroup same nature rock sample.A Microdrilling is bored in rock sample kernel of section, tripping in analog casing is equal in analog casing bottom
The even true stratum preforation tunnel of borehole simulation, is as follows：
S31：According to different-grain diameter quartz sand optimum proportioning value determined by S2, ABCD tetra- is prepared with the same method with S2 (1)
The identical rock sample of group property, every group two, specification is Φ 100mm × 100mm.
S32：The aperture of a Φ 10mm × 80mm is bored in every group of rock sample kernel of section, makes the thin-walled with aperture equivalent specifications
For steel pipe as analog casing, steel pipe bottom bores some equally distributed aperture analogue perforation eyelets.Analog casing is rotated tripping in
In minute analog eyelet, the results are shown in Figure 3.
It should be noted that in the step specification of rock sample in being according to the present embodiment improved experimental facilities be arranged,
As long as meeting the specification of the requirement of dilatation experimental facilities.The size of drilling is the ratio setting according to live well and oil reservoir,
There is no strict standard.
S4：The formation condition of rock sample and the simulation in contaminated zone, are as follows：
Four groups of rock samples prepared by S3 are put into improved three axis rock mechanics to test in the triaxial chamber of system, improved three axis rock
Stone mechanics test system schematic diagram, as shown in Figure 4.By liquid injection system from rock sample top cross-section injected clear water, injection is pressed
Power is the pore pressure of purpose reservoir, and pore pressure, which is continued for adding to water filling dilatation expansion test, to be terminated.It is applied simultaneously to rock sample
Add axis to press and confining pressure, is saturated fluid under the conditions of confining pressure pore pressure to realize, and apply temperature purpose formation temperature.
After injected clear water pressure reaches pore pressure, the powder that is marked with radioactive tracer of injection from simulation wellbore
Sand mixture fluid, while measuring the permeability variation of rock sample.For the pollution level for simulating different, two different infiltrations are set
Rate a, b, wherein a>b.It is respectively 0.4 and 0.2, each two rock in tetra- groups of rock samples of ABCD that permeability a, b is set in the present embodiment
When sample permeability respectively reaches the permeability of setting, stop note flour sand.Four groups of rock sample POLLUTION SIMULATION degree are as shown in table 1, simulation
The different rock sample of different permeability Imitating pollution levels, contaminated zone illustraton of model are as shown in Figure 5.
Table 1
S5：It carries out water filling dilatation and expands simulation laboratory test.
（1）The low flow velocity water filling dilatation of constant pressure expands simulation laboratory test.During experiment, to having simulated dirt
Four groups of rock sample continued synchronizations for contaminating band apply identical radially, axially pressure, the simulation to the rock sample of every group of difference pollution level
Injected clear water in wellbore, injection pressure are respectively：The confining pressure that A groups are 50%, the confining pressure that B groups are 75%, the confining pressure that C groups are 95%, D
Group is 120% confining pressure, long-time（48h）Fluid is injected to generate dilatation area, during experiment into rock core by water injection equipment
It continuously records axial, radial stress and strain and core permeability, the analysis to test result obtains best flash pressure.
（2）The low flow velocity water filling dilatation of constant flow rate expands simulation laboratory test.Four groups of rock samples separately are taken, four groups of experiments are held
Continuous synchronize applies identical radially, axially pressure, different flows is injected to the rock sample of every group of difference pollution level, respectively：
0.1mL/min, 0.5mL/min, 2mL/min and 10mL/min, for a long time（48h）Fluid is injected into core to generate dilatation
Area continuously records axial, radial stress and strain during experiment and core permeability, the analysis to test result obtains most
Good dilatation flow.
（3）Circulating water pressure dilatation under different frequency expands simulation laboratory test.It includes the cycle under different frequency
The low flow velocity dilatation expansion simulation laboratory test of constant pressure and the low flow velocity dilatation of the cycle constant flow rate under different frequency are swollen
Swollen simulation laboratory test.
（a）Simulation laboratory test is expanded for the low flow velocity dilatation of the cycle constant pressure under different frequency, tests process
In, four groups of test durations are synchronized and apply identical radially, axially pressure.Low flow velocity dilatation used in S5 (2) constant pressure is swollen
The best water injection pressure of the capacity enlargement effect that is obtained in swollen simulation laboratory test regards the radial flow pressure of every group of experiment.To every group of difference
The rock sample of pollution level changes note and adopts time scale（A groups, 48 h of note:Adopt 12 h；B groups, 48 h of note:Adopt 24 h；C groups, note 48
h:Adopt 36 h；D groups, 48 h of note:Adopt 48 h）, for a long time（48 h）Fluid is injected into core to generate dilatation area.
（b）For the low flow velocity dilatation de-plugging simulation laboratory test of the cycle constant flow rate under different frequency, process is tested
In, four groups of test durations are synchronized and apply identical radially, axially pressure.It is expanded with the low flow velocity dilatation of S5 (3) constant flow rate
The best injection flow of the capacity enlargement effect that is obtained in simulation laboratory test is radially injected flow as every group of experiment, not to every group
Rock sample change note with pollution level adopts time scale（A groups, 48 h of note:Adopt 12 h；B groups, 48 h of note:Adopt 24 h；C groups, note 48
h:Adopt 36 h；D groups, 48 h of note:Adopt 48 h）, for a long time（48 h）Fluid is injected into core to generate dilatation area.
S6：The interpretation of result of dilatation expansion test and the foundation of dilatation equation.During experiment, continuous record three classes dilatation is swollen
Axial direction, radial stress-strain and the core permeability of swollen experiment, as shown in fig. 6, to dilatation test result establish injection parameter with
Matching relationship between rock stress-strain, permeability.Best flash pressure, best dilatation flow, best is obtained after analysis
Note adopt time ratio, the equation under the conditions of rock expansion dilatation is established according to analysis of experiments result, is carried for the foundation of mathematical model
For theoretical direction.
S7：The plane of fracture after dilatation expansion（Microcrack）Microscopic pattern is tested.After water filling dilatation expansion test, rock is taken out
Sample.Rock sample after circulating water pressure dilatation de-plugging simulation laboratory test under different frequency is observed.Use three-dimensionalreconstruction
Imaging x-ray microscope, the profit X-ray layer scanning technology that computerizeds control are observed as follows：
（1）The low flow velocity dilatation for observing constant pressure expands the dilatation section deployment conditions of rock sample after simulation laboratory test.It calculates
Microcrack density analyzes each test parameters and rock porosity, the variation relation of permeability, fracture parameters, determines capacity enlargement effect
Best water injection pressure.
（2）The low flow velocity dilatation for observing constant flow rate expands the variation for rupturing dilatation face of rock sample after simulation laboratory test,
The variation for analyzing the porosity, permeability of rock, determines the best injection flow of capacity enlargement effect.
（3）The rupture dilatation face that the circulating water pressure dilatation under different frequency expands rock sample after simulation laboratory test is observed,
The low flow velocity dilatation expansion simulation laboratory test rock sample of comparison loop constant pressure and the low flow velocity dilatation for recycling constant flow rate are swollen
The plane of fracture dilatation de-plugging situation of swollen simulation laboratory test rock sample provides best cyclic hydrostatic pressure for the foundation of numerical model below
Power dilatation expands embodiment.
（4）The contaminated zone dilatation section of every group of difference pollution level rock sample is observed in testing dilatation, and comparison is different
Dilatation situation under pollution level.
By testing three classes dilatation the variation of rock sample microcrack, the microcrack density under the conditions of different dilatations is calculated, is built
Found each test parameters and rock porosity, the variation relation of permeability, fracture parameters.Experimental observation result is as follows：Dilatation section
Deployment conditions（As shown in Figure 7）, plane of fracture height isogram（As shown in Figure 8）, microcrack form, position visual description
（As shown in Figure 9）.Sample granular cementation degree and slit distribution characterization after dilatation（As shown in figs. 10-11）.
S8：Establish loose sand reservoir dilatation expansion mathematical model and numerical model.It is observed according to plane of fracture microscopic pattern
Analysis of experiments result and rock expansion dilatation establishing equation mathematical model.It is first fixed using the rock expansion dilatation equation established in S6
Property describes the proportionate relationship between injection parameter and rock strain, porosity, permeability, then with microscopic pattern observation experiment in S7
Comparative result example relationship is verified, and a set of water filling dilatation expansion mathematical model is established, and expands Numerical-Mode to establish water filling dilatation
Type is provided fundamental basis.
According to live reservoir parameter, best water filling dilatation parameter is acquired using the mathematical model of foundation, is gone out from pit shaft scale
Hair, establishes the water filling dilatation expansion numerical model of temperature-seepage-pipe coupling model, and specific method is：
（1）With finite element analysis software, it is as shown in figure 12 to establish pit shaft scale sandstone reservoir waterpower dilatation de-plugging geometrical model；
（2）The rock mechanics parameters measured according to S1 experiments, the material properties of Definition Model；
（3）Mesh generation is carried out to model, definition unit attribute carries out mesh refinement for simulating pollution area；
（4）According to live reservoir data, boundary condition, load and temperature are applied to model；
（5）Dilatation parameter is defined, wellbore is simulated according to geometrical model wellbore section and rock sample to the dilatation parameter obtained by experiment S6
The ratio in section is amplified, then defines amplified dilatation parameter to model；
（6）Model is submitted to calculate, result of calculation cloud atlas, as shown in figure 13；
（7）By by the result of calculation of the waterpower dilatation numerical model of temperature-seepage-pipe coupling model, with water filling dilatation expanding chamber
Interior test result is compared, and numerical model is constantly corrected, until the model can expand laboratory test results with water filling dilatation
Verification mutually.
By temperature-seepage-stress waterpower dilatation Numerical coupling model that test result is verified, respectively in oil field difference mesh
Layer applied.Target zone geomechanics parameter is first inputted in a model（It is answered including rock mechanics parameters, stratum near wellbore
Force environment etc.）.Then by changing waterpower dilatation injection parameter, corresponding porosity, permeability, microcrack density are calculated
Etc. parameters variation（As shown in Figure 14 and Figure 15）, under the premise of not pressing blind hole wall, effect is increased most with porosity, permeability
For the purpose of good, the dilatation water flooding construction parameter under the conditions of different rock mechanics parameters is determined, experimental result is used in combination to construct injection
Parameter optimizes, and obtains best dilatation injecting scheme.
The above is only the experimental program and numerical model constitution and implementation mode of the present invention, it should be understood that the present invention is not
It is confined to form disclosed herein, is not to be taken as excluding other embodiments, and can be used for various other combinations, modification
And environment, and can be in contemplated scope described herein, modifications can be made through the above teachings or related fields of technology or knowledge.
And changes and modifications made by those skilled in the art do not depart from the spirit and scope of the present invention, then all right appended by the present invention
It is required that protection domain in.
It should be noted that for each embodiment of the method above-mentioned, for simple description, therefore it is all expressed as to a system
The combination of actions of row, but those skilled in the art should understand that, the application is not limited by the described action sequence, because
For according to the application, certain some step can be performed in other orders or simultaneously.Secondly, those skilled in the art also should
Know, embodiment described in this description belongs to preferred embodiment, involved action and unit not necessarily this Shen
It please be necessary.
Claims (9)
1. a kind of water filling dilatation expands the preferred experimental method of construction parameter, which is characterized in that include the following steps：
S1：To reservoir rock carry out mechanical property transitivity parameter test, obtain the rock granularmetric composition distribution curve,
Porosity, permeability, load-deformation curve and elastic parameter；
S2：Prepare the artificial rock most identical with the reservoir rock property；
S3：The artificial rock of gained in multiple S2 is prepared, and multiple artificial rocks are divided into several groups, every group artificial comprising two
Rock sample bores a wellbore, tripping in analog casing, for simulating exploitation scene in the kernel of section of the artificial rock；
S4：The simulation test of formation condition and contaminated zone is carried out to the artificial rock of gained in S3；
S5：Water filling dilatation is carried out to the artificial rock of gained in S4 and expands simulation laboratory test, obtains the best water filling ginseng of dilatation
Number；
S6：It analyzes the result of the water filling dilatation expansion simulation laboratory test and establishes dilatation equation；
S7：The plane of fracture formed after simulation laboratory test is expanded to the water filling dilatation to carry out microscopic pattern observation experiment and divide
Analysis；
S8：Analysis of experiments result is observed according to the rock expansion dilatation equation and plane of fracture microscopic pattern, establishes mathematical
Model, and as the theoretical direction for establishing numerical model.
2. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that described
S2
Include the following steps：
S21：According to the granularmetric composition distribution curve of the rock obtained in S1, prepares multigroup various granularity quartz sand differences and account for
The artificial rock of ratio；
S22：Test obtains porosity, permeability, load-deformation curve and the elastic parameter of each group artificial rock described in S21,
And the mechanics physical parameter with surveyed reservoir rock in S1 compares respectively；
S23：Analysis obtains the artificial rock of one group of quartz sand particle grain size accounting situation most identical with reservoir rock property.
3. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that in S4
In,
The formation condition simulation includes simulating the pore pressure and formation temperature of target zone rock, and concrete operations are as follows：
Respectively from the top cross-section injected clear water of the artificial rock of each group, a layer pore pressure until injection pressure achieves the goal, and
Pore pressure is always maintained to off-test；
Meanwhile formation temperature is set to the artificial rock of each group.
4. a kind of water filling dilatation as described in claim 1 or 3 expands the preferred experimental method of construction parameter, which is characterized in that
In S4, the concrete operations of the contaminated zone simulation test are as follows：
In the simulation wellbore for each group artificial rock for bearing the pore pressure, flour sand mixture fluid, the flour sand are injected
Mixture fluid is marked using radioactive tracer；
Meanwhile the permeability of each group artificial rock is measured, two different permeabilities are set in advance, and continue to inject the stream
Body simulates the difference of two artificial rocks of each group with this until two artificial rocks of each group respectively reach preset permeability
The pollution condition of degree.
5. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that described
S5
Specific steps include：
S51：Into S4, the simulation wellbore of the artificial rock of gained carries out water injection test, and the experiment is joined in different water fillings respectively
Several lower progress, the water injection parameter include water injection pressure, injection flow and water injection frequency；
S52：According to the ess-strain and permeability of artificial rock, best water injection pressure, best injection flow and best are analyzed
Note adopts time ratio.
6. a kind of water filling dilatation as claimed in claim 5 expands the preferred experimental method of construction parameter, which is characterized in that described
Water filling
Water filling dilatation expansion test under frequency parameter is respectively under conditions of the best water injection pressure and best injection flow
It carries out.
7. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that described
S6
It specifically includes：It determines the matching relationship between the stress-strain of the injection parameter and artificial rock, permeability, establishes
Equation under the conditions of rock expansion dilatation provides basic theory guidance for the foundation of mathematical model.
8. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that described
S7
It specifically includes：Utilize rock sample internal structure and different pollution level rock samples after layer scanning technology observation three classes dilatation experiment
Dilatation area size after experiment obtains the including but not limited to visual observation of microcrack form and position as a result, and to experiment
As a result it is compared analysis.
9. a kind of water filling dilatation as described in claim 1 expands the preferred experimental method of construction parameter, which is characterized in that described
S8
It specifically includes：
S81：Injection parameter and rock sample strain, the mathematical model of porosity, permeability are established by finite element software；
S82：Best dilatation parameter is found out by the mathematical model；
S83：It is configured and calculates by the best dilatation parameter log model；
S84：By will be tried in the result of calculation of the waterpower dilatation numerical model of temperature-seepage-pipe coupling model and dilatation de-plugging room
It tests result to be compared, logarithm model is modified, until the model can mutually be verified with dilatation laboratory test results；
S85：It is swollen to water filling dilatation for the purpose of finally increase by porosity, permeability, fracture spacing in the application of numerical model
Swollen parameter carries out preferably, finally determining best arrangement and method for construction.
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