CN106442269B - A method of screening laboratory physical simulation experiment non-variables rock core - Google Patents
A method of screening laboratory physical simulation experiment non-variables rock core Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012216 screening Methods 0.000 title claims abstract description 15
- 238000004088 simulation Methods 0.000 title claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 238000002347 injection Methods 0.000 claims abstract description 29
- 239000007924 injection Substances 0.000 claims abstract description 29
- 239000011148 porous material Substances 0.000 claims abstract description 21
- 150000003839 salts Chemical class 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims abstract description 13
- 238000002474 experimental method Methods 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 9
- 229920006395 saturated elastomer Polymers 0.000 claims abstract description 7
- 239000012153 distilled water Substances 0.000 claims description 8
- 238000005303 weighing Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 241000372132 Hydrometridae Species 0.000 claims 1
- 230000005611 electricity Effects 0.000 claims 1
- 238000012332 laboratory investigation Methods 0.000 abstract 1
- 238000005070 sampling Methods 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 239000006004 Quartz sand Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 239000012267 brine Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- NYNKCGWJPNZJMI-UHFFFAOYSA-N Clebopride malate Chemical compound [O-]C(=O)C(O)CC(O)=O.COC1=CC(N)=C(Cl)C=C1C(=O)NC1CC[NH+](CC=2C=CC=CC=2)CC1 NYNKCGWJPNZJMI-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
- G01N15/0893—Investigating volume, surface area, size or distribution of pores; Porosimetry by measuring weight or volume of sorbed fluid, e.g. B.E.T. method
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention discloses a kind of methods for screening laboratory physical simulation experiment non-variables rock core, the steps include: S1, successively weigh rock core dry weight M to be screened1, M2, M3, Mn, each rock core is carried out to vacuumize saturated water, measures rock core weight in wet base later, calculates pore volume；S2, it prepares salt water and measures its conductivity；S3, displacement test is carried out to each rock core using salt water, at interval of being sampled for a period of time under the conditions of constant speed；S4, the conductivity for measuring production fluid draw out the variation degree of conductivity and the relation curve of injection pore volume (PV number) according to the conductivity value of production fluid；S5, the curve with close feature is chosen, their corresponding rock cores have similar pore structure and flow characteristics, can be used as non-variables rock core for in-house laboratory investigation.The method of the present invention is easily operated, and cost is relatively low, can obtain the rock core with close pore structure and flow characteristics under the premise of not injuring rock core, meet experiment demand.
Description
Technical field
The present invention be directed to a kind of methods that laboratory physical simulation experiment is screened with non-variables rock core, belong to petroleum work
Journey field.
Background technique
Petroleum industry is quickly grown, and many laboratory physical simulation experiment researchs are widely used in that Oil Field is instructed to develop.
And deepening continuously with oil field development, the requirement to laboratory experiment further improve, and some needs are synchronized, is right
Than and Research on Regularity experiment, such as injection rate, implantation concentration to polymer flooding effect influence research, need to guarantee
Rock core used has consistent pore structure and flow characteristics, and rock core will be as non-variables in experiment.Therefore rock core sampling
Just become the underlying issue of the Quasi-experiment study.
Currently, conventional sampling method can only guarantee rock core in lithology substantially, and rock core internal pore structure without
Method analysis.In this regard, expert has carried out some researchs both at home and abroad, and certain methods are made, as application No. is 90105845.9
" oil-bearing rock slice selection, production and information extraction ", is mainly classified using the method for testing rock core saturation degree；Application
Number be 201110056396.8 " a kind of method of rock core sampling ", number is mainly acquired to the vibration of rock core using ultrasonic wave
According to classifying；Application No. is a kind of 201210054779.6 " substep classification sampling sides suitable for carbonate samples
Method ", it mainly uses to mill clast and carry out optical observation and classify.The above method has certain effect in rock core sampling
Fruit, but the standard of its selection is more by artificial judgment, and instrument is as just auxiliary, and artificial judgment is by environment and temperature
The influence of degree and personal experience, accuracy and speed are not well positioned to meet experiment demand；Meanwhile the equal nothing of the above method
Method judges whether the flow characteristics of rock core is close, and this is particularly significant for indoor moveable experimental study.Screening has similar
The rock core of pore structure and flow characteristics, it is ensured that science, the accuracy of experimental result have great significance for desk research.
Summary of the invention
In view of the above-mentioned problems, using brine displacements distilled water, measurement produces the invention proposes a kind of method for screening rock core
The conductance profile of liquid out judges the screening rock core method of rock core feature according to curvilinear characteristic, can not injure rock core
Under the premise of, obtain pore structure and the similar artificial core of flow characteristics.
Technical scheme is as follows
A method of screening laboratory physical simulation experiment non-variables rock core, comprising the following steps:
S1 electronic balance) is utilized, n rock core dry weight M to be screened is successively weighed1, M2, M3, Mn, to each rock core into
Row vacuumizes, saturated water, then measures rock core weight in wet base, calculates pore volume；
S2) salt water needed for preparation experiment measures its conductivity using conductivity meter；
S3 displacement test) is carried out to rock core using prepared salt water, is carried out under the conditions of constant speed at interval of a period of time
Sampling；
S4 the conductivity that every section of time production fluid) is measured using conductivity meter, draws out the variation degree and note of conductivity
Enter the relation curve of PV number；
S5) by comparing the curvilinear characteristic of each rock core, pore structure and the similar rock core of flow characteristics can be filtered out.
Further, the particular content of step S1 is, with the unsaturated core quality M of electronic balance weighing1, M2,
M3, Mn, until carrying out being evacuated to critical pressure standard value -0.092MPa to it, abundant saturated water weighs saturated water
Core quality M afterwards1ˊ, M2ˊ, M3ˊ, Mnˊ determines its pore volume (M1ˊ-M1)/ρWater, (M2ˊ-M2)/ρWater, (M3
ˊ-M3)/ρWater, (Mnˊ-Mn)/ρWater。
Further, the particular content of step S2 is that a kind of screening indoor physical simulation according to claim 1 is real
Test the method with non-variables rock core, which is characterized in that the particular content of step S2 is, the distilled water needed for electronic balance weighing and
Inorganic salts, configuration salt water are the salinity of setting, measure its conductivity value with conductivity meter.
Further, the particular content of step S3 is to fill the salt water prepared in step S2 in intermediate receptacle, use pipeline
It has been sequentially connected ISCO pump, intermediate receptacle and rock core, has been pumped with ISCO and is infused salt water from core entry end with the speed of v mL/min
Enter, carry out displacement and successively carry out connecing liquid in rock core outlet end using small test tube at interval of ts, until the distilled water quilt in rock core
Until complete displacement comes out, i.e., injection rate is 3 times of pore volumes (3PV).
Further, the particular content of step S4 is, with production fluid in conductivity meter METHOD FOR CONTINUOUS DETERMINATION same time interval
Conductivity value records the corresponding injection length of each conductivity value, and the variation degree of conductivity is calculated using intermediate differential method, draws
The variation degree of conductivity and the relation curve of injection length.
Further, the conductivity meter model is DDS-11A digital display conductivity meter.
Further, according to the present invention provided by experimental method, screen the judgment basis of rock core are as follows: the variation of conductivity
Degree is consistent with injection length relation curve form, and when curve starts to occur obviously raising up, corresponding injection PV number is close,
Injection PV number corresponding to peak of curve is close, and curve is reduced to injection PV number corresponding when stationary value and approaches, all errors
No more than 10%.
The present invention has the advantages that
1, compared with prior art, screening technique provided by the invention is easily operated, and cost is relatively low, high reliablity；
2, during the test, rock core does not need to colour, mill, and can obtain close under the premise of not injuring rock core
The rock core of pore structure and flow characteristics meets experiment demand.
Detailed description of the invention
Fig. 1 is the variation degree of rock core production fluid conductivity to be screened and the relation curve of injection length；
Fig. 2 is the variation degree of the part rock core production fluid conductivity in Fig. 1 and the relation curve of injection length.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawing with specific implementation to this
Invention is described in detail.
Using the quartz sand of 80~100 mesh, 2 pieces of artificial cores of single mesh number are respectively prepared, are named as No. 1, No. 2 rocks
The heart；Then the quartz sand using 60~80 mesh (1/3 mass), 80~100 mesh (1/3 mass), 100~120 mesh (1/3 mass) is vertical
Divide three layers upwards and manufacture 2 pieces of artificial cores, is named as No. 3, No. 4 rock cores.It after weighing dry weight, is vacuumized respectively, saturation is steamed
Distilled water, until critical pressure standard value -0.092MPa, after being sufficiently saturated distilled water, weighing, calculating pore volume is respectively
133.3mL,129.1mL,128.0mL,130.0mL.Salt water is prepared using 10L distilled water, composition is as shown in the table.
Table 1 prepares salt water composition
| Ingredient | Content (mg/L) |
| CaCl2:2H2O | 700 |
| NaCl | 5000 |
Preparation salt water salinity is 5700mg/L, and measuring its conductivity value with DDS-11A digital display conductivity meter is 9000 μ s/
Rock core is placed in core holding unit by cm, has been sequentially connected ISCO pump, intermediate receptacle and core holding unit with pipeline, has been used
Salt water is injected No. 1 core holding unit arrival end with the speed of 4mL/min by ISCO pump, carries out displacement, with the interval time of 30s,
Successively terminate liquid in the outlet of rock core with test tube, until the distilled water in rock core by complete displacement out until, injection rate at this time
It is 3 times of pore volume.With the conductivity of production fluid in DDS-11A digital display conductivity meter every section of time interval of sequentially determining, draw
The variation degree of production fluid conductivity processed and the relation curve of injection length.Also in the same way to 2,3, No. 4 rock cores, it surveys
Determine and draw the variation degree of production fluid conductivity and the relation curve of injection length, last figure as shown in figure 11,2,3,4
Shown in number rock core curve.
It was found from being analyzed in Fig. 1:
No. 1, No. 2 rock core tracing patterns it is consistent, No. 3, No. 4 rock core tracing patterns it is consistent.When curve most starts to occur obviously
When raising up, i.e., No. 1 in figure, No. 2 rock core curves in injection PV number be 0.7PV or so and No. 3, No. 4 rock core curves in injection PV number
It when for 0.4PV or so, indicates that large change takes place in production fluid conductivity value, i.e., contains displacement salt water, generation in production fluid
Waterflood front is broken through, and displacement fluid reaches rock core outlet end, show under identical flow velocity No. 1, No. 2 rock cores there is similar hole
Structure and flow characteristics, No. 3, No. 4 rock cores there is similar pore structure and flow characteristics.Meanwhile the corresponding note of peak of curve
Enter PV number and curve be reduced to injection PV number corresponding when stationary value, No. 1, No. 2 rock cores it is close, No. 3, No. 4 rock cores it is close, into
One step illustrate No. 1, No. 2 rock cores there is similar flow channel, No. 3, No. 4 rock cores there is similar flow channel.Therefore can sentence
It is disconnected, No. 1, No. 2 rock cores belong to similar rock core, No. 3, No. 4 rock cores belong to similar rock core.In Fig. 2, picking out two of them has
Representative curve compares, and can more intuitively judge affiliated type, carries out rock core screening.
The present invention by the way that rock core, the conductivity variations situation of production fluid is analyzed during brine displacements distilled water,
Show that the variation degree of conductivity is consistent with injection PV number relation curve form, it is corresponding when curve starts to occur obviously raising up
Injection PV number it is close, injection PV number corresponding to peak of curve is close, and curve is reduced to injection PV corresponding when stationary value
Number is close, then judgement belongs to same class rock core, has similar pore structure and flow characteristics, can be used for same type experiment
It uses.This method is easy to operate, and it is convenient to judge, of less demanding to implementation condition, is suitable for promoting in oil-gas field development field.
The above is only a preferred embodiment of the present invention, it is noted that the invention is not limited to aforesaid way,
Without departing from the principles of the invention, moreover it is possible to be further improved, these improvement also should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of method for screening laboratory physical simulation experiment non-variables rock core, which comprises the following steps:
S1 electronic balance) is utilized, n rock core dry weight M to be screened is successively weighed1, M2, M3... Mn, each rock core take out true
Sky, saturated water measure rock core weight in wet base later, calculate pore volume；
S2) salt water needed for preparation experiment measures its conductivity using conductivity meter；
S3 displacement test) is carried out to each rock core using prepared salt water, at interval of being taken for a period of time under the conditions of constant speed
Sample；
S4) using the conductivity of conductivity meter measurement production fluid, the variation degree of conductivity and the relationship of injection PV number are drawn out
Curve；
S5) by comparing the curvilinear characteristic of each rock core, rock core similar in pore structure and flow characteristics is filtered out；
According to provided experimental method, the judgment basis of non-variables rock core is screened are as follows:
1) variation degree of conductivity is consistent with injection length relation curve form；
2) corresponding injection PV number is close when curve starts to occur obviously raising up；
3) the injection PV number corresponding to peak of curve is close；
4) it is close to be reduced to injection PV number corresponding when stationary value for curve.
2. a kind of method for screening laboratory physical simulation experiment non-variables rock core according to claim 1, feature exist
In the particular content of step S1 is, with the unsaturated n core quality M of electronic balance weighing1, M2, M3..., Mn, to its carry out
Until being evacuated to critical pressure standard value -0.092MPa, being sufficiently saturated salinity is d mg/L water, the rock after weighing saturated water
Heart mass M1ˊ, M2ˊ, M3ˊ ..., Mnˊ determines its pore volume (M1ˊ-M1)/ρWater, (M2ˊ-M2)/ρWater, (M3ˊ-M3)/
ρWater..., (Mnˊ-Mn)/ρWater。
3. a kind of method for screening laboratory physical simulation experiment non-variables rock core according to claim 1, feature exist
In the particular content of step S2 is distilled water and inorganic salts needed for electronic balance weighing, and configuration salt water is the mineralising of setting
Degree, measures its conductivity value with conductivity meter.
4. a kind of method for screening laboratory physical simulation experiment non-variables rock core according to claim 1, feature exist
In the particular content of step S3 is to fill the salt water prepared in step S2 in intermediate receptacle, has been sequentially connected ISCO with pipeline
Pump, intermediate receptacle and rock core are pumped with ISCO and are injected salt water from core entry end with the speed of v mL/min, carry out displacement, often
It is spaced t s, successively carries out connecing liquid in rock core outlet end using small test tube, until the water in rock core is come out by complete displacement,
I.e. injection rate is 3 times of pore volumes.
5. a kind of method for screening laboratory physical simulation experiment non-variables rock core according to claim 1, feature exist
In the particular content of step S4 is, with the conductance of production fluid in DDS-11A digital display conductivity meter METHOD FOR CONTINUOUS DETERMINATION same time interval
Rate value records the corresponding injection length of each conductivity value, and the variation degree of conductivity is calculated using intermediate differential method, draws out electricity
The variation degree of conductance and the relation curve of injection length.
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| CN109030317A (en) * | 2018-09-05 | 2018-12-18 | 中山大学 | A kind of impervious material osmotic grouting laboratory testing rig |
| CN113219007A (en) * | 2021-04-23 | 2021-08-06 | 中国石油化工股份有限公司 | Laboratory measurement method for electrical properties of shale in Longmaxi group in flat bridge area |
| CN113484217B (en) * | 2021-07-06 | 2024-06-18 | 西南石油大学 | Simulation experiment method for white cloud petrochemical removal process |
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|---|---|---|---|---|
| EP0562146A1 (en) * | 1992-03-27 | 1993-09-29 | Diasol Holding S.A. | Process and apparatus for logging a geological test drilling |
| CN102183585A (en) * | 2011-03-09 | 2011-09-14 | 西南石油大学 | Rock core sampling method |
| CN102434152A (en) * | 2011-12-05 | 2012-05-02 | 中国石油天然气股份有限公司 | Method for calculating oil saturation of reservoir |
| CN102565858A (en) * | 2011-12-21 | 2012-07-11 | 西南石油大学 | Method for calculating water saturation of porous medium |
| CN103233730A (en) * | 2013-05-02 | 2013-08-07 | 中国石油大学(华东) | Experimental measurement method for resistivity of mixed stratum water in rock core displacement process |
| CN203422371U (en) * | 2013-07-25 | 2014-02-05 | 中国石油天然气股份有限公司 | Rock core measurement system |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0562146A1 (en) * | 1992-03-27 | 1993-09-29 | Diasol Holding S.A. | Process and apparatus for logging a geological test drilling |
| CN102183585A (en) * | 2011-03-09 | 2011-09-14 | 西南石油大学 | Rock core sampling method |
| CN102434152A (en) * | 2011-12-05 | 2012-05-02 | 中国石油天然气股份有限公司 | Method for calculating oil saturation of reservoir |
| CN102565858A (en) * | 2011-12-21 | 2012-07-11 | 西南石油大学 | Method for calculating water saturation of porous medium |
| CN103233730A (en) * | 2013-05-02 | 2013-08-07 | 中国石油大学(华东) | Experimental measurement method for resistivity of mixed stratum water in rock core displacement process |
| CN203422371U (en) * | 2013-07-25 | 2014-02-05 | 中国石油天然气股份有限公司 | Rock core measurement system |
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