CN104819990A - Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core - Google Patents
Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core Download PDFInfo
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- CN104819990A CN104819990A CN201510236593.6A CN201510236593A CN104819990A CN 104819990 A CN104819990 A CN 104819990A CN 201510236593 A CN201510236593 A CN 201510236593A CN 104819990 A CN104819990 A CN 104819990A
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- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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Abstract
The invention discloses a microscopic displacement experimental system based on a CT digital core. The experimental system comprises a core holding unit and microscopic displacement equipment, wherein the core holding unit comprises an inlet end, an outlet end, a core area and a shell; the shell is made of polyether-ether-ketone PEEK; the microscopic displacement equipment comprises an oil phase intermediate container and a water phase intermediate container connected in parallel and is used for displacing constant-flux pumps of the oil phase intermediate container and the water phase intermediate container; the liquid outlet ends of the oil phase intermediate container and the water phase intermediate container are connected with the inlet end of the core holding unit; the core holding unit is used for pressurizing the core clamped in the core holding unit by virtue of a hand pump; and a metering bottle is arranged at the outlet end of the core holding unit. The system disclosed by the invention is applied to small-capacity small-scale microscopic displacement experiments, and compared with the traditional displacement experimental equipment, the technical equipment is high in operating precision and measurement accuracy.
Description
Technical field
The present invention relates to a kind of microscopic displacement experiment system based on CT digital cores and microscopic displacement experiment method, belong to the technical field of the Physical Experiment of petroleum gas.
Background technology
The final purpose of oil-field development is exactly how extraction crude oil as much as possible from formation pore, to reduce the wasting of resources.Crude oil is present in the sedimentary interstices of thousands of meters, underground, due to the complicacy of the fluid distrbution in sedimentary environment and stratum, people have no idea directly on a large scale epistemically under oil and water zonation.How descending rich region and the enriched form of crude oil epistemically, how to determine the distribution of remaining oil in reservoir, is the subject matter of oil-field development, is also the key subjects that upstream sections of oil industry is solved so far completely.From the distribution of microcosmic, small scale micro-nano rank research remaining oil, understand and grasp microcosmic formation mechenism and the regularity of distribution of remaining oil, reproduction oil reservoir development present situation directly perceived, carrying out on this basis and improve recovery ratio research, is the important evidence of oil deposit management decision-making.Therefore, after microscopic displacement experiment and displacement, the Study on spatial distribution of rock core inner fluid enjoys the attention of domestic and international Ge great Oil Producing Countries.
The method that fluid distrbution research in porous medium is commonly used mainly contains microphysics simulation and Computer Numerical Simulation two kinds.Computer Numerical Simulation is studied flowing, the regularity of distribution of the physical property of oil reservoir and fluid.Although the method is widely used, but still exist significantly uncertain; Microphysics simulation is exactly the microscopic seepage process by microscopical amplification, video recording and image processing techniques Study In Reservoir fluid, thus the microscopic distribution of fluid in announcement porous medium.At present, microphysics simulation is main based on realistic model and two dimension view, but realistic model can not all features of simulation core completely, and fluid always distributes in three dimensions in blowhole, merely from the angle views of two dimension, be easy to bring comparatively big error.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of microscopic displacement experiment system based on CT digital cores.
The present invention also provides the method utilizing above-mentioned experimental system to carry out microscopic displacement experiment.Conventional displacement test combines with CT technology effective by the present invention, utilizes the rock core of CT scan technology to the different displacement stage to scan, thus observation rock core pore texture, the change of Fluid in Pore distribution can be reproduced in real time.
Technical scheme of the present invention is as follows:
Based on a microscopic displacement experiment system for CT digital cores, comprise core holding unit and microcosmic displacement equipment;
Described core holding unit, comprises entrance point, endpiece, rock core district, shell; Described shell is polyetheretherketonematerials materials (PEEK), PEEK is a kind of special engineering plastics of excellent performance, and high temperature resistant (260 DEG C), mechanical property excellence, radioresistance, self lubricity are good, chemicals-resistant corrosion etc.; With Metal Phase ratio, PEEK material has radiolucency, and the clamper shell made can not affect the normal use of CT equipment X ray; Existing traditional clamper shell is metal material, and X ray cannot penetrate and cause utilizing CT device scan to obtain rock core displacement status information, and traditional clamper build is bigger than normal, is not inconsistent with CT scan sample size, impact scanning effect;
Described microcosmic displacement equipment, comprise oil phase intermediate receptacle in parallel and aqueous phase intermediate receptacle, constant-flux pump for displacement oil phase intermediate receptacle and aqueous phase intermediate receptacle, described oil phase intermediate receptacle is all connected with the entrance point of described core holding unit with the outlet end of aqueous phase intermediate receptacle, described core holding unit realizes pressurizeing to the rock core wherein clamped by wobble pump, and the endpiece of described core holding unit is provided with recorder jar.
Preferred according to the present invention, bottom described core holding unit, be provided with rotation seat.Described rotation seat, for core holding unit being fixed on CT sample stage in CT scan process, unloads in displacement test process so that core holding unit access displacement flow process.
Preferred according to the present invention, the capacity of described oil phase intermediate receptacle and aqueous phase intermediate receptacle is 50-150mL.
Preferred according to the present invention, the pipeline between described wobble pump and core holding unit is provided with tensimeter, and described manometric range is 10MPa, precision 0.25MPa.
Preferred according to the present invention, the entrance point of described core holding unit is provided with inlet pressure gauge, and the range of described inlet pressure gauge is 6MPa, precision 0.25MPa.
Utilize above-mentioned experimental system to carry out the method for microscopic displacement experiment, comprise step as follows:
1) be arranged on after rock core drying in described core holding unit, be placed in Zeiss MCT-400 CT and locate, scanning rock core, obtain core analysis area three-dimensional digital cores data volume;
2) core holding unit is accessed microcosmic displacement equipment, single-phase aqueous phase displacement, single-phase oil phase displacement or aqueous phase, the heterogeneous mixing displacement test of oil phase are realized to described rock core;
3) according to the research contents design observation moment point of displacement test, be the displacement moment, suspend described rock core displacement in the described observation moment, close outlet port of rock core holder, entrance point, wobble pump;
4) core holding unit is put into Zeiss MCT-400 CT to scan, when obtaining this displacement moment, the fluid distrbution in described rock core;
5) step 2 is repeated) to step 4), until according to described step 3) all design observation moment point obtain fluid distrbution in described rock core.
, described step 1 preferred according to the present invention) in the diameter of rock core be 1-2cm, length is 2-4cm.
Advantage of the present invention is:
1, the present invention adopts on-the-spot rock core, at utmost reduction reservoir pore structure, and simulating oil deposit fluid flow, ensures the reliability of experiment.The rock sample size of diameter 1-2cm is compared compared with the Standard rock sample of diameter 2.5cm simultaneously, is easier to obtain accurate CT scan result.
2, experimental technique of the present invention can not only data measured by experiment, and can carry out visual analyzing to the fluid distrbution in rock core under the different displacement stage.
3, system and method for the present invention not only can obtain the distributed in three dimensions of fluid in porous medium, and also assures that the accuracy of the fluid distrbution result recorded, comparatively two-dimensional phase is than more tallying with the actual situation.
4, this invention ensures that the carrying out of all kinds of displacement laboratory experiment of petroleum industry, multiple displacement mode, displacement condition can be simulated.
5, system of the present invention is applicable to low capacity, on a small scale microscopic displacement experiment, and contained technical equipment is more traditional, and displacement test equipment compares performance accuracy, measuring accuracy is higher.
Accompanying drawing explanation
Fig. 1 is the anatomical connectivity figure of displacement system of the present invention;
In FIG, 1, constant-flux pump; 2, oil phase intermediate receptacle; 3, aqueous phase intermediate receptacle; 4, core holding unit; 4-1, entrance point; 4-2, endpiece; 5, wobble pump; 6, the tensimeter arranged between core holding unit and wobble pump; 7, recorder jar.
Fig. 2 scans by displacement test method of the present invention fluid distribution pattern in the digital cores in certain moment obtained.
Embodiment
Below in conjunction with embodiment and Figure of description, the present invention is described in detail, but is not limited thereto.
As shown in Figure 1 and Figure 2.
Embodiment 1,
Based on a microscopic displacement experiment system for CT digital cores, comprise core holding unit and microcosmic displacement equipment;
Described core holding unit 4, comprises entrance point 4-1, endpiece 4-2, rock core district, shell; Described shell is polyetheretherketonematerials materials (PEEK);
Described microcosmic displacement equipment, comprise oil phase intermediate receptacle 2 in parallel and aqueous phase intermediate receptacle 3, constant-flux pump 1 for displacement oil phase intermediate receptacle 2 and aqueous phase intermediate receptacle 3, described oil phase intermediate receptacle 2 is all connected with the entrance point 4-1 of described core holding unit 4 with the outlet end of aqueous phase intermediate receptacle 3, the rock core that described core holding unit 4 is realized wherein clamping by wobble pump 5 pressurizes, and the endpiece 4-2 of described core holding unit 4 is provided with recorder jar 7.
Embodiment 2,
As described in Example 1 based on a microscopic displacement experiment system for CT digital cores, its difference is, bottom described core holding unit 4, be provided with rotation seat.Core holding unit is fixed on CT sample stage by described rotation seat when in CT scan process, unloads so that core holding unit access displacement flow process in displacement test process.
Embodiment 3,
As described in Example 1 based on a microscopic displacement experiment system for CT digital cores, its difference is, the capacity of described oil phase intermediate receptacle 2 and aqueous phase intermediate receptacle 3 is 50-150mL.
Pipeline between described wobble pump 5 and core holding unit 4 is provided with tensimeter 6, and the range of described tensimeter 6 is 10MPa, precision 0.25MPa.
The entrance point 4-1 of described core holding unit 4 is provided with inlet pressure gauge, and the range of described inlet pressure gauge is 6MPa, precision 0.25MPa.
Embodiment 4,
Utilize experimental system as described in embodiment 1-3 any one to carry out the method for microscopic displacement experiment, comprise step as follows:
1) will be arranged on after rock core drying in described core holding unit 4, be placed in Zeiss MCT-400 CT and locate, scanning rock core, obtain core analysis area three-dimensional digital cores data volume;
2) core holding unit 4 is accessed microcosmic displacement equipment, single-phase aqueous phase displacement, single-phase oil phase displacement or aqueous phase, the heterogeneous mixing displacement test of oil phase are realized to described rock core;
3) according to the research contents design observation moment point of displacement test, be the displacement moment, suspend described rock core displacement in the described observation moment, close outlet port of rock core holder 4-2, entrance point 4-1, wobble pump 5;
4) core holding unit 4 is put into Zeiss MCT-400 CT to scan, when obtaining this displacement moment, the fluid distrbution in described rock core;
5) step 2 is repeated) to step 4), until according to described step 3) all design observation moment point obtain fluid distrbution in described rock core.
Described step 1) in the diameter of rock core be 1-2cm, length is 2-4cm.
As shown in Figure 2, CT scan is utilized can to real-time monitor fluid distrbution in rock core.
Claims (7)
1. based on a microscopic displacement experiment system for CT digital cores, it is characterized in that, this system comprises core holding unit and microcosmic displacement equipment;
Described core holding unit, comprises entrance point, endpiece, rock core district, shell; Described shell is polyetheretherketonematerials materials, described microcosmic displacement equipment, comprise oil phase intermediate receptacle in parallel and aqueous phase intermediate receptacle, constant-flux pump for displacement oil phase intermediate receptacle and aqueous phase intermediate receptacle, described oil phase intermediate receptacle is all connected with the entrance point of described core holding unit with the outlet end of aqueous phase intermediate receptacle, described core holding unit realizes pressurizeing to the rock core wherein clamped by wobble pump, and the endpiece of described core holding unit is provided with recorder jar.
2. a kind of microscopic displacement experiment system based on CT digital cores according to claim 1, is characterized in that, bottom described core holding unit, be provided with rotation seat.
3. a kind of microscopic displacement experiment system based on CT digital cores according to claim 1, it is characterized in that, the capacity of described oil phase intermediate receptacle and aqueous phase intermediate receptacle is 50-150mL.
4. a kind of microscopic displacement experiment system based on CT digital cores according to claim 1, it is characterized in that, the pipeline between described wobble pump and core holding unit is provided with tensimeter, described manometric range is 10MPa, precision 0.25MPa.
5. a kind of microscopic displacement experiment system based on CT digital cores according to claim 1, is characterized in that, the entrance point of described core holding unit is provided with inlet pressure gauge, and the range of described inlet pressure gauge is 6MPa, precision 0.25MPa.
6. utilize experimental system as described in claim 1-5 any one to carry out the method for microscopic displacement experiment, it is characterized in that, it is as follows that the method comprising the steps of:
1) be arranged on after rock core drying in described core holding unit, be placed in Zeiss MCT-400 CT and locate, scanning rock core, obtain core analysis area three-dimensional digital cores data volume;
2) core holding unit is accessed microcosmic displacement equipment, single-phase aqueous phase displacement, single-phase oil phase displacement or aqueous phase, the heterogeneous mixing displacement test of oil phase are realized to described rock core;
3) according to the research contents design observation moment point of displacement test, be the displacement moment, suspend described rock core displacement in the described observation moment, close outlet port of rock core holder, entrance point, wobble pump;
4) core holding unit is put into Zeiss MCT-400 CT to scan, when obtaining this displacement moment, the fluid distrbution in described rock core;
5) step 2 is repeated) to step 4), until according to described step 3) all design observation moment point obtain fluid distrbution in described rock core.
7. experimental technique as claimed in claim 6, is characterized in that, described step 1) in the diameter of rock core be 1-2cm, length is 2-4cm.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236593.6A CN104819990A (en) | 2015-05-11 | 2015-05-11 | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
| AU2016102347A AU2016102347A4 (en) | 2015-05-11 | 2016-04-22 | CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
| PCT/CN2016/080031 WO2016180215A1 (en) | 2015-05-11 | 2016-04-22 | Ct digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
| AU2016260347A AU2016260347A1 (en) | 2015-05-11 | 2016-04-22 | CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
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| CN201510236593.6A CN104819990A (en) | 2015-05-11 | 2015-05-11 | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
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| CN104819990A true CN104819990A (en) | 2015-08-05 |
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| CN201510236593.6A Pending CN104819990A (en) | 2015-05-11 | 2015-05-11 | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
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| CN (1) | CN104819990A (en) |
| AU (2) | AU2016260347A1 (en) |
| WO (1) | WO2016180215A1 (en) |
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| CN105784939A (en) * | 2016-03-21 | 2016-07-20 | 西南石油大学 | Underground gas storage reservoir simulating experimental device and experimental method |
| WO2016180215A1 (en) * | 2015-05-11 | 2016-11-17 | 中国石油大学(华东) | Ct digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
| CN106568981A (en) * | 2016-08-04 | 2017-04-19 | 中国石油大学(北京) | Automatic core displacement test device, and control method |
| CN107132240A (en) * | 2017-06-07 | 2017-09-05 | 中国石油天然气股份有限公司 | High-temperature high-pressure fluid filling experimental device for CT |
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| CN108169261A (en) * | 2018-01-05 | 2018-06-15 | 李中民 | A kind of core holding unit for CT scan |
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| WO2016180215A1 (en) * | 2015-05-11 | 2016-11-17 | 中国石油大学(华东) | Ct digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
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| CN108931541A (en) * | 2018-05-05 | 2018-12-04 | 青岛科技大学 | A kind of core chucking device for micro- CT equipment visual research porous media dynamic flow event |
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| CN113740513B (en) * | 2021-09-08 | 2023-10-20 | 安徽理工大学 | In-situ CT online scanning displacement experiment system and application method |
Also Published As
| Publication number | Publication date |
|---|---|
| AU2016260347A1 (en) | 2017-04-27 |
| WO2016180215A1 (en) | 2016-11-17 |
| AU2016102347A4 (en) | 2017-07-27 |
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