CN106153662A - The measuring method of rock core stress sensitivity - Google Patents
The measuring method of rock core stress sensitivity Download PDFInfo
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- CN106153662A CN106153662A CN201610438887.1A CN201610438887A CN106153662A CN 106153662 A CN106153662 A CN 106153662A CN 201610438887 A CN201610438887 A CN 201610438887A CN 106153662 A CN106153662 A CN 106153662A
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Abstract
The invention discloses a kind of method based on Nuclear Magnetic Resonance Measurement rock core stress sensitivity, based on conventional displacement test and nuclear magnetic resonance, NMR method of testing, measure rock core stress sensitivity；Including: core pretreatment；Pressurize saturation simulation formation water by rock core；Put without being fixed on NMR coil in magnetic core holding unit；The nuclear magnetic resonance, NMR T of confined pressure testing rock core is set2Relaxation spectrum；Stress value interval retest is set；The highest static stress value is down to successively 2.5MPa by 20MPa, and each stress value keeps a period of time to test T2Spectrum, is calculated current conventional permeability and NMR permeability；Draw rock core routine stress sensitive linearity curve.The present invention can understand rock core stress sensitivity Changing Pattern from microcosmic angle, there is provided the pore-size distribution in experimentation, the features such as porosity changes, NMR permeability, microcrack dense matrix limestone pore-size distribution, porosity and permeability Changing Pattern in stress sensitive is tested can effectively be detected.
Description
Technical field
The present invention relates to rock core stress measurement technology, particularly relate to a kind of based on nuclear magnetic resonance, NMR (Nuclear Magnetic
Resonance, NMR) method that rock core stress sensitivity is measured, can be applicable in petroleum industry.
Background technology
NMR signal is mainly derived from the interaction between proton and magnetic field.It is under mineral water saturation
Limestone rock core contain a large amount of H-1 core, when now using the rock core that Lamor frequency deexcitation is in magnetic field, it can be observed that
The strongest NMR signal.Relaxation is extremely important physical quantity in hydrogen nuclear magnetic resonance, and it characterizes magnetization vector and is being penetrated
Frequently under the exciting of field during generation nuclear magnetic resonance, NMR, from deviation equilibrium state to the process being again restored to equilibrium state.
H-1 core in different size slit is different from pore surface contact probability, the T of generation2Relaxation time is different, therefore
The architectural feature of rock core mesopore can be reflected by measuring the NMR signal of the water for slit magnitude.By
There is different size of slit in rock core, the proton relaxation time being in different slit is different, therefore Nuclear Magnetic Resonance Measurement
Obtain is not a single value, but an i.e. T of distribution within the specific limits2Spectrum.
In oil-gas mining, along with the generation of reservoir internal flow, reservoir pore pressure reduces, reservoir rock stress balance shape
State changes.Elastic or plastic deformation is there is according to rock mechanics theory now rock.By reservoir physics principle, rock permeability
Rate is controlled by pore throat radius.The deformation of rock necessarily causes the change of rock pore structure and pore volume；This change
Largely effect on fluid seepage flow wherein.The purpose of stress sensitivity evaluation experimental is to understand burden pressure suffered by rock core
Pore throat deformation when (confined pressure) changes, crack closure causes the degree that rock percolation ability changes.
Compared to conventional reservoir, fracture-pore reservoir limestone Reservoir Body structure is complicated, seam hole different scale is big, crack is risen mainly
The feature of channeling.China's Fissure-cave type carbonate-reservoir reservoir body structure is complicated, effective reservoir space hole, hole, the stream of seam
Dynamic characteristic dimension difference is big, and main channeling is played in crack.Natural microcrack grown by subregion dense matrix limestone, in exploitation
During, along with strata pressure declines, its rule such as fluid distrbution, presser sensor is different from common low permeability sandstone reservoirs.
Currently available technology mainly carries out the rock core displacement test of laboratory by simulation stratum condition.In displacement process
By measuring rock core axial compression, the change of confined pressure and flow calculates the change of rock core stress sensitivity, and details see China's stone
Oil Gas Industry standard SY/T 5358-2010.
The information such as said method cannot provide the rock core pore-size distribution in stress sensitive experiment, porosity change.For causing
Close limestone reservoir is mainly micro-nano pore throat, and microcrack is grown, and mineral composition is complicated, in its flow event, and sizable one
Segment fluid flow is in bond and can not flow；The complicated reservoirs medium that after volume fracturing, artificial seam and natural seam intertexture are formed, its stream
The rules such as body distribution, presser sensor are different from common low permeability sandstone reservoirs.Conventionally test means and method hardly result in fine and close ash
The important reservoir rock seepage flow physical-property parameters such as rock reservoir rock pore size distribution feature, movable fluid distribution, in addition
Lack effective theoretical method further exploration hole, larynx, seam Multi-parameter coupling effect, the reservoir rock change in physical of initiation and
The change of fluid distrbution.Therefore, advised by prior art understanding compact limestone super-low permeability reservoir flow behavior and fluid distrbution
Rule is abnormal difficult.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of and answers rock core based on High Temperature High Pressure nuclear magnetic resonance, NMR
The method that power sensitivity measures, can measure the stress sensitivity of compact limestone, and obtains rock core displacement test mesoporous and divide
The microscopic informations such as cloth.
The principle of the present invention is: by building a set of nuclear magnetic resonance, NMR online displacement system, carry out rock core displacement test and
T2The measurement of spectrum, applies different burden pressure by core holding unit, and simulated formation physical condition carries out the rock core of laboratory and drives
For experiment.Rock core is put in special core holding unit without magnetic, and clamper is put into magnetic field center, to reach to utilize nuclear-magnetism
Resonant device measures the effect of the information such as the pore-size distribution of rock core.Axle is used up high-pressure and high-precision plunger displacement pump (Teledyne
Isco 260D) provide fluid displacement to control；Can be by the rock core under nuclear magnetic resonance equipment measurement different conditions in displacement process
T2Spectrum (T2Spectrum)；Again by metering displacing fluid rate of flow of fluid, rock core pressure at two ends, burden pressure and rock core T2Compose these measuring parameters,
The Changing Pattern of rock core stress sensitivity is obtained by the metering of corresponding computing formula.
For T2The measurement of relaxation time spectrum, the hole being internally formed due to limestone and microcrack complex distribution, application is often
Rule method is difficult to determine its internal structure and distribution.When rock core saturated mineral matter water, these holes are filled by water, Ke Yitong
Cross T2The distribution of spectrometry rock core internal void.According to magnetic resonance principle, nuclear magnetic resonance, NMR T2Relaxation time and single void ratio surface
Long-pendingMeet following relation:
Wherein, ρ2For surface relaxation intensity, can be seen that from above formula, single intrapore T2The ratio of relaxation time and this hole
Surface area is inversely proportional to, thus is directly proportional to pore radius.According to discussion above, rock core inside is different size hole composition
Network structure, total relaxation is the superposition of single hole relaxation, it may be assumed that
Wherein, S (t) is the total nuclear magnetic resonance signal intensity utilizing CPMG sequence to record, AiThe expression relaxation time is T2i's
Ratio shared by component, is and T2iThe pore volume of corresponding certain pore size accounts for the ratio of total pore size volume.By to above formula
Carry out mathematical inversion, available corresponding T2Distribution of relaxation times, i.e. T2Spectrum.
The present invention adopts the following technical scheme that
A kind of method based on Nuclear Magnetic Resonance Measurement rock core stress sensitivity, surveys with nuclear magnetic resonance, NMR based on conventional displacement test
Method for testing, measures rock core stress sensitivity；Comprise the following steps:
The first step, core pretreatment: rock core is carried out rock according to China National Petroleum industry standard SY/T 5358 regulation
Prepared by sample, clean and dry, and according to China National Petroleum industry standard SY/T 5336 specifying measurement air permeability with full
Mensuration with pore volume.
Second step, preparation simulated formation water, put into evacuation in intermediate receptacle by rock core, adds formation water and pressurizes full
With.Saturation time is not less than 12h.
3rd step, rock core saturation simulation formation water is placed on without in magnetic core holding unit, and will be without magnetic core holding unit
It is fixed on malcoils, carries out rock core displacement test.
Rock core displacement test includes the 3rd step～the 5th step.
4th step, to arrange clamper confined pressure be initial static stress, water drive to flow speed stability, keeps more than 30min, tests rock
The nuclear magnetic resonance, NMR T of the heart2Spectrum, and calculate current conventional permeability according to formula 3.
5th step, according to China National Petroleum industry standard SY/T 5358, stress value (clean confined pressure) interval is set to
2.5MPa, 3.5MPa, 5MPa, 7MPa, 9MPa, 11MPa, 15MPa, 20MPa, repeat the 4th step.
6th step, according to China National Petroleum industry standard SY/T 5358, the highest static stress value is dropped successively by 20MPa
To 2.5MPa, each stress value keeps more than 1h, tests T2Spectrum, and it is calculated current conventional permeability and NMR permeability.
Concrete foundation formula 3 calculates current conventional permeability, calculates NMR permeability according to formula 4.
7th step, drafting rock core routine stress sensitive linearity curve, and utilize the T under the different stress conditions of rock core2Spectrum becomes
Change and rock core is classified.
The measuring method that 4th step and the 6th step relate to conventional permeability is as follows: rock core is put in clamper pressurization displacement
Time, the formula calculating conventional rock sample permeability according to Darcy's law is as follows:
Wherein, K1For rock Test Liquid Permeability of Core (10-3um2), μ is the fluid viscosity (mPa s) under test condition；L is rock
Sample length (cm)；A is rock sample cross-sectional area (cm2)；Δ p is rock sample two ends pressure reduction (MPa)；Q is that fluid is logical within the unit interval
Cross the volume (cm of rock sample3/s).Select suitable axial compression displacement until the axial flow speed stability of rock core, write down two ends pressure differential deltap p, stream
Speed Q, application formula (3) can calculate the permeability under the conditions of different confined pressure.
6th step is calculated rock core NMR permeability by formula 4:
In formula 4, K is rock core perm-plug method (10-3um2)；CSDREFor SDR extended model constant；φNMRFor saturated rock sample
NMR porosity (%)；T2gFor T2The geometrical mean (ms) of spectrum.
The stress sensitivity curve plotting that 7th step relates to is specifically: conventional permeability is changed K relativelyi/ K is (different
Rock sample permeability and original permeability under net impact) as vertical coordinate, by stress value (clean confined pressure, the MPa) conduct in the 5th step
Abscissa draws stress sensitive linearity curve.
The foundation T that 7th step relates to2Spectrum classification of change rock core evaluation methodology is specific as follows:
According to discussing above, T2What stave was existing is the distribution situation of different size of hole.T2Relaxation time and pore radius
Size is directly proportional, and the relaxation time is the longest, and to represent hole the biggest, and different rock cores has different T2Spectrum.According to T2The shape of spectrum is (single
Peak, bimodal etc.), it can be determined that the pore content of different rock cores.In conjunction with T2The rule that relaxation time is directly proportional to pore size, can
To draw different pore size distribution change in an experiment in rock core under experiment condition.Can be from combination with stress sensitive linearity curve
Macroscopically understand permeability variation relation and pore-size distribution relation.
The test of routine displacement test and nuclear magnetic resonance, NMR is combined by measuring method of the present invention, and to build a kind of nuclear magnetic resonance, NMR online
Displacement equipment (High Temperature High Pressure nuclear magnetic resonance, NMR test platform).The present invention implements, in experiment, to use a 0.23T permanent magnetic resonance
Analysis system (the product SPEC-PMR-023T that Beijing Spike development in science and technology company limited provides) measures the T of compact limestone2
Spectrum.This system is 150mm with the magnet (magnetic field intensity 0.23T) of a horizontal positioned, magnet space, and search coil uses to be sent out
Penetrating reception and share coil, interior diameter is 125mm.This system both can measure with to the little rock core of 1 inch, it is also possible to 4 English
Very little full-hole core measures, and is especially suitable for oil flow experiment and uses；Using during test and measuring sequence is CPMG sequence.
Routine displacement test is combined by NMR on-line testing platform with nuclear magnetic resonance, NMR test, can not only measure rock quick
Perception curve can also make full use of the ability of nuclear magnetic resonance, NMR Non-Destructive Testing, it is thus achieved that the distribution of the hole of reservoir core, Size of Crack
Change, it is thus achieved that the change mechanism of compact limestone core susceptibility, and it is capable of high temperature, height during oil exploitation flowing experiment
The on-line measurement of pressure, it is thus achieved that formation condition multiple percolation flow physical properties parameter such as porosity, pore-size distribution, permeability, oil-containing are saturated
Degree etc., the dense matrix limestone experimentation grown for microcrack opens new approach.Can by nuclear magnetic resonance, NMR on-line testing
Prior art can only obtain the pressure-sensitive curve of rock core to overcome and the information technologys such as experimentation mesoporous distribution cannot be obtained and ask
Topic.
Compared with prior art, the invention has the beneficial effects as follows:
The present invention provides a kind of method measured rock core stress sensitivity based on High Temperature High Pressure nuclear magnetic resonance, NMR, can survey
The stress sensitivity of amount compact limestone, and obtain the microscopic informations such as rock core displacement test mesoporous distribution.
The T under rock core stress sensitive linearity curve stress condition different with rock core can be obtained by the inventive method2Spectrum, passes through
By conventional pressure-sensitive curve and T2Spectrum contrast, can understand rock core stress sensitivity Changing Pattern from microcosmic angle.The present invention simultaneously
T can be passed through2The features such as spectrum provides the pore-size distribution in experimentation, and porosity changes, NMR permeability.Additionally, nuclear magnetic resonance, NMR exists
Line is measured and can effectively be detected that microcrack dense matrix limestone pore-size distribution, porosity and permeability are in stress sensitive is tested
Changing Pattern；By to the T of rock core in pressure-sensitive experiment2Spectrum on-line measurement can with real-time monitored to hole and the distribution of microcrack and
Situation of change.
Accompanying drawing explanation
Fig. 1 is that a kind of of embodiment of the present invention offer measures compact limestone based on High Temperature High Pressure nuclear magnetic resonance, NMR test platform
The method flow block diagram of stress sensitivity.
Fig. 2 is the structured flowchart of the limestone rock core nuclear magnetic resonance, NMR online displacement system that the embodiment of the present invention provides；
Figure medium ring press pump and displacement pump provide displacement pressure, displacement liquid flow-control and burden pressure to set；Nuclear-magnetism is altogether
The equipment of shaking includes probe, magnet and nuclear magnetic resonance spectrometer, is used for launching and gathering NMR signal and then measure T2Spectrum；Calculate
Machine control system: be mainly used to control and gather data, including process and the automatic collection of displacement variable of magnetic resonance signal.
Fig. 3 is that the perm-plug method that the embodiment of the present invention provides calculates Permeability fit Comparative result figure with nuclear magnetic resonance, NMR；
Wherein, vertical coordinate is that nuclear magnetic resonance, NMR calculates permeability；Abscissa is perm-plug method.
Fig. 4 be the embodiment of the present invention provide according to T2The three quasi-representative rock core stress sensitivity T that spectrum on-line measurement obtains2
Spectrum change curve；
Wherein, T during (a) is 3# rock core pressure uphill process2Spectrum；B () is T during 3# rock core pressure declines2Spectrum；(c) be
T in 5# rock core pressure uphill process2Spectrum；D () is T during 5# rock core pressure declines2Spectrum；E () is 6# rock core pressure uphill process
Middle T2Spectrum；F () is T during 6# rock core pressure declines2Spectrum.
Detailed description of the invention
Below in conjunction with the accompanying drawings, further describe the present invention by embodiment, but limit the model of the present invention never in any form
Enclose.
Figure of description is the schematic diagram of simplification, and the basic structure of the present invention is described the most in a schematic way, and therefore it is only
Show the composition relevant with the present invention.
The present invention provides a kind of method of stress sensitivity measuring rock core, as a example by measuring compact limestone, utilizes high temperature
High pressure nuclear magnetic resonance, NMR on-line testing platform realizes the stress sensitivity curved measurement of compact limestone.Always according to the present invention in embodiment
T obtained by the nuclear magnetic resonance, NMR test used2Spectrum calculates NMR permeability, and it is contrasted with conventionally test result.
The method of the stress sensitivity measuring rock core that the present invention provides comprises the steps:
The first step, core pretreatment: rock core is carried out rock according to China National Petroleum industry standard SY/T 5358 regulation
Prepared by sample, clean and dry；
According to China National Petroleum industry standard SY/T 5336 specifying measurement air permeability and saturated pore volume
Measure.When rock core saturated mineral matter water, these holes are filled by water, can pass through T2Dividing of spectrometry rock core internal void
Cloth.Nuclear magnetic resonance, NMR T2Relaxation time and single void ratio surface areaMeet above-mentioned formula 1.
Second step, the preparation experiment saline (simulated formation water) close with formation water part, put into rock core in intermediate receptacle
Evacuation pressurization is saturated；
Saturation time is not less than 12h.
3rd step, rock core saturation simulation formation water is placed on without in magnetic core holding unit, and will be without magnetic core holding unit
It is fixed on malcoils.
The present invention specifically uses the displacement test carrying out rock core without magnetic core holding unit.This experiment is adopted as
CN201110304182.8 record core holding unit, including left regulation rock core plug, right regulation rock core plug, exhaustion exploitation entrance,
Exhaustion exploitation outlet, left pressure cap, right pressure cap, left plug, right plug, metallic gasket, Teflon O ring, politef
Gum cover, ring press chamber, coil brace, coil, the chamber outlet of ring pressure, ring pressure chamber entrance, core chamber, cylinder, back pressure valve, bypass valve
Door.In view of the environment of nuclear magnetic resonance, NMR high-intensity magnetic field, the pressure voltage of core holding unit without magnetic that this experiment uses is 30Mpa.In order to keep away
Exempting from core holding unit to destroy Distribution of Magnetic Field, reduce the quality of Nuclear Magnetic Resonance Measurement signal, the cylinder of clamper chooses polyethers ether
(PEEK) resin, the most this material also ensure that the light of clamper and pressure-bearing.Confined pressure fluid selects hydrogen-free fluorocarbon oil, confined pressure stream
If body is hydrogeneous, the accuracy of Nuclear Magnetic Resonance Measurement can be affected.
In embodiment, the parameter of the compact limestone rock core Nuclear Magnetic Resonance Measurement that the 3rd step relates to is set to: sequence is measured in experiment
Being classified as CPMG sequence, parameter is resonant frequency 10.11MHz, echo time 300us, scanning accumulative frequency 16 times, the sampling interval
1us, sampling number 2048.
4th step, to arrange clamper confined pressure be initial static stress, water drive to flow speed stability, keeps more than 30min, tests core
Magnetic resonance T2Spectrum；
High Temperature High Pressure nuclear magnetic resonance, NMR test platform is used to measure the T of rock core2Spectrum, T2The measurement of spectrum meets above-mentioned formula 2, right
Formula 2 carries out mathematical inversion, available corresponding T2Spectrum.
Current permeability can be calculated further.Select suitable axial compression displacement until the axial flow speed stability of rock core, write down two
End pressure differential deltap p, flow velocity Q, applying equation 3 can calculate the conventional permeability under the conditions of different confined pressure.
Compact limestone rock core NMR permeability can be calculated by formula 4:
In formula 4, K is rock core perm-plug method (10-3um2)；CSDREFor SDR extended model constant；φNMRFor saturated rock sample
NMR porosity (%)；T2gFor T2The geometrical mean (ms) of spectrum.
Specifically comprise the following steps that
In order to calculate NMR permeability, need to simulate m, n and have selected 15 blocks of rock cores for this, Core information such as table one, foundation
Formula 4 the Fitting Calculation can obtain m=2.41, n=0.45, CSDRE=6862, fitting result is as shown in Figure 3.Wherein R2Value is
0.8244, show that the permeability that NMR measurement obtains has suitable accuracy, but its result still all exists with conventional gas permeability
Certain deviation. main cause is because limestone complex pore structure, containing crack and dead hole, and permeability be one extremely
Complicated amount, T2Spectrum Nuclear Magnetic Resonance Measurement can not reflect the anisotropy of permeability.
5th step, according to China National Petroleum industry standard SY/T 5358, stress value interval be set to 2.5MPa,
3.5MPa, 5MPa, 7MPa, 9MPa, 11MPa, 15MPa, 20MPa, repeat the 4th step.
6th step, according to China National Petroleum industry standard SY/T 5358, the highest static stress value 20MPa is down to successively
2.5MPa, each stress value keeps more than 1h.Test T2Spectrum, and calculate current permeability.
7th step, permeability changed K relativelyi/ K (rock sample permeability and original permeability under different net impact) conduct
Vertical coordinate, clean confined pressure (MPa) is drawn stress sensitive linearity curve as abscissa, is drawn rock core stress sensitive linearity curve.
Rock core can be divided into different classes of by the pressure-sensitive curvilinear motion according to compact limestone rock core.
T in experimentation2Spectrum change illustrates pressure-sensitive curve and permeability variation rule.According to the T in experimentation2
Rock core is divided three classes by spectrum change: I class: in pressurization, pressure sensibility is higher, in pressure reduction, recovery extent is preferable；This kind of
Core permeability recovers preferably；II class: in pressurization, pressure sensibility is higher, in pressure reduction, recovery extent is poor；This kind of
Core permeability recovers poor；Group III: in pressurization, pressure sensibility is relatively low, in pressure reduction, recovery extent is poor, this kind of
Core permeability recovers poor.
Preferred embodiment below is as a example by system in Tahe Oilfield compact limestone rock core stress sensitivity is tested, to compact limestone rock core
Stress sensitivity measured.Table 1 is compact limestone reservoir, the domestic Xinjiang region core sample that the present embodiment uses
Product information.
Compact limestone reservoir, table 1 Xinjiang region core sample information
Fig. 1 is that a kind of of embodiment of the present invention offer measures compact limestone based on High Temperature High Pressure nuclear magnetic resonance, NMR test platform
The method flow block diagram of stress sensitivity, mainly comprises the steps that
It is first depending on SY/T 5358 standard and carries out rock sample pretreatment, perform operation A)～C):
A) prepared by rock sample
The direction that drills through of plunger sample should be consistent with reservoir liquid flow direction；Rock core length is not less than 1.5 times of diameter.
B) rock sample cleans
All fluids unborn in rock sample all must be cleaned up.
C) rock sample is dried
Every piece of rock sample should be dried to constant weight, and drying time is not less than 48h.
D) then utilize petroleum gas standard SY/T 5336 to measure perm-plug method and the pore volume of rock core, perform
Operation D)～E): measure rock core air permeability by the regulation of petroleum gas standard SY/T 5336.
E) rock core is saturated and pore volume measures
By saturated for rock core vacuumizing formation water；Rock sample soaks at least more than 40h in saturated solution, after measuring saturated liquid
Rock sample quality.
Sample is put in test platform, search suitable parameter measurement rock core different conditions T2Spectrum, performs operation F)～
G):
F) standard sample is put on nuclear magnetic resonance, NMR on-line testing platform, open T2Spectrum test equipment, searches and properly tests ginseng
Number.
G) specifically comprising the following steps that and put in clamper by rock core, clamper is placed in magnet center.Unlatching nuclear magnetic resonance, NMR sets
Standby, commissioning device is to obtain the NMR signal of rock core.Key step: a. searches suitable rf frequency, is used for exciting and is in magnetic field
Core sample；B. search P90 and P180 and obtain correct pulse width.Press from both sides as in figure 2 it is shown, rock core is fixed on without magnetic rock core
In holder, step tests its T as shown in Figure 12Spectrum.
The measurement parameter of this example is as follows: dominant frequency (SF): 10.11MHz；90 ° of pulse width (P90): 20us；180 ° of pulses
Width (P180): 40us；Sampling number (nech): 2048；Scanning accumulative frequency (NS): 16, sampling interval (DW) 1us；Probe
Dead time (Dead1): 40us, pulse spacing: 150us.
H) according to the evaluation methodology of stress sensitivity in petroleum gas standard SY/T5336, rock core stress sensitivity is drawn
Curve；
Fig. 2 is the structured flowchart of the limestone rock core nuclear magnetic resonance, NMR online displacement system that the present embodiment uses.Figure medium ring press pump
Displacement pressure, displacement liquid flow-control and burden pressure is provided to set with displacement pump；Nuclear magnetic resonance equipment includes probe, magnet
And nuclear magnetic resonance spectrometer, it is used for launching and gathering NMR signal and then measure T2Spectrum；Computer control system: be mainly used to
Control and gather data, including process and the automatic collection of displacement variable of magnetic resonance signal.This test uses a 0.23T forever
Magnetic nuclear magnetic resonance spectroscopy system (Beijing Spike development in science and technology company limited product SPEC-PMR-023T) measures compact limestone
T2Spectrum.This system uses with the magnet (magnetic field intensity 0.23T) of a horizontal positioned, magnet space 150mm, search coil
Launch to receive and share coil, interior diameter 125mm.This system both can measure with to the little rock core of 1 inch, it is also possible to 4 English
Very little full-hole core measures, and is especially suitable for oil flow experiment and uses.Using during test and measuring sequence is CPMG sequence.For
Avoiding core holding unit destroy Distribution of Magnetic Field and reduce the quality of Nuclear Magnetic Resonance Measurement signal, experiment uses without the clamping of magnetic rock core
Device, pressure voltage is 30Mpa.Displacement pump is high-pressure and high-precision plunger displacement pump (Teledyne Isco 260D)；In order to reduce confined pressure stream
The body impact on nuclear magnetic signal accuracy, selects dehydrogenation fluorocarbon oil as confined pressure fluid.Computer Control & data acquisition unit is used
Gather and process NMR signal.
Fig. 3 is that the perm-plug method that the embodiment of the present invention provides calculates Permeability fit Comparative result figure with nuclear magnetic resonance, NMR；
Wherein, vertical coordinate is that nuclear magnetic resonance, NMR calculates permeability；Abscissa is perm-plug method.
I) measure compact limestone stress sensitive linearity curve according to petroleum gas standard SY/T 5358, measure it not simultaneously
With the T under state2Spectrum.
Fig. 4 be the present embodiment provide according to T2The three quasi-representative rock core stress sensitivity T that spectrum on-line measurement obtains2Spectrum becomes
Change curve；T during wherein (a) is 3# rock core pressure uphill process2Spectrum；B () is T during 3# rock core pressure declines2Spectrum；C () is 5#
T in rock core pressure uphill process2Spectrum；T during the decline of (d) 5# rock core pressure2Spectrum；E () is T in 6# rock core pressure uphill process2
Spectrum；T during the decline of (f) 6# rock core pressure2Spectrum.
It should be noted that publicizing and implementing the purpose of example is that help is further appreciated by the present invention, but the skill of this area
Art personnel are understood that various substitutions and modifications are all without departing from the present invention and spirit and scope of the appended claims
Possible.Therefore, the present invention should not be limited to embodiment disclosure of that, and the scope of protection of present invention is with claim
Book defines in the range of standard.
Claims (10)
1. a measuring method for rock core stress sensitivity, comprises the following steps:
The first step, core pretreatment: prepared by rock sample, clean and dry, and measures rock core air permeability and pore volume；
Second step, preparation simulated formation water, put into rock core evacuation in intermediate receptacle, add described simulated formation water and pressurize
Saturated；
3rd step, rock core saturation simulation formation water is placed on without in magnetic core holding unit, and will fix without magnetic core holding unit
Rock core displacement test is carried out in malcoils；
4th step, to arrange clamper confined pressure be initial static stress, water drive to flow speed stability, the nuclear magnetic resonance, NMR T of testing rock core2Spectrum, and
It is calculated current conventional permeability；
5th step, by stress value interval be set to 2.5MPa, 3.5MPa, 5MPa, 7MPa, 9MPa, 11MPa, 15MPa, 20MPa, weight
Perform the 4th step again；
6th step, the highest static stress value being down to by 20MPa 2.5MPa successively, each stress value keeps a period of time to test T2Spectrum,
And it is calculated current conventional permeability and nuclear magnetic resonance, NMR permeability；
7th step, drafting rock core routine stress sensitive linearity curve.
2. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, core pretreatment tool described in the first step
Body carries out pretreatment according to China National Petroleum industry standard SY/T 5358 regulation.
3. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, described in second step, saturation time is the lowest
In 12 hours.
4. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, clamps without magnetic rock core described in the 3rd step
Implement body uses number of patent application to be the core holding unit that CN201110304182.8 records.
5. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, the nuclear-magnetism of rock core described in the 4th step is altogether
Shake T2Spectrum, records especially by following method:
Nuclear magnetic resonance, NMR T2Relaxation time and single void ratio surface areaMeet relation described in formula 1:
In formula 1, ρ2For surface relaxation intensity；
The internal network structure for different size hole composition of rock core, is overlapped single hole relaxation by formula 2, obtains total
Relaxation:
In formula 2, S (t) is the total nuclear magnetic resonance signal intensity utilizing CPMG sequence to record；AiThe expression relaxation time is T2iComponent
Shared ratio, is and T2iThe pore volume of corresponding certain pore size accounts for the ratio of total pore size volume；
By formula 2 is carried out mathematical inversion, obtain corresponding T2Distribution of relaxation times, i.e. T2Spectrum.
6. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, conventional permeability tool described in the 6th step
Body is calculated by formula 3:
In formula 3, K1For rock Test Liquid Permeability of Core (10-3um2)；μ is the fluid viscosity (mPa s) under test condition；L is rock sample
Length (cm)；A is rock sample cross-sectional area, and unit is cm2；Δ p is rock sample two ends pressure reduction (MPa)；Flow velocity Q is that fluid is when unit
Interior by the volume of rock sample, unit is cm3/s。
7. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, nuclear magnetic resonance, NMR infiltration described in the 6th step
Rate is calculated especially by formula 4:
In formula 4, K is rock core perm-plug method (10-3um2)；CSDREFor SDR extended model constant；φNMRFor saturated rock sample nuclear-magnetism
Resonance holes porosity (%)；T2gFor T2The geometrical mean of spectrum, unit is ms.
8. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, draws rock core conventional described in the 7th step
Stress sensitive linearity curve, specifically:, will as vertical coordinate using the ratio of rock sample permeability and original permeability under different net impact
Stress value in 5th step draws stress sensitive linearity curve as abscissa.
9. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, the 7th step is also with rock core not
With the nuclear magnetic resonance, NMR T under stress condition2Rock core is classified by spectrum change.
10. the measuring method of rock core stress sensitivity as claimed in claim 1, is characterized in that, the ginseng of described Nuclear Magnetic Resonance Measurement
Number is arranged particularly as follows: it is CPMG sequence that sequence is measured in experiment；Parameter is resonant frequency 10.11MHz；Echo time is 300us；Sweep
Retouch accumulative frequency 16 times；Sampling interval 1us；Sampling number is 2048.
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