AU2016260347A1 - CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method - Google Patents
CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method Download PDFInfo
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 68
- 238000002474 experimental method Methods 0.000 title claims abstract description 49
- 238000000034 method Methods 0.000 title claims description 16
- 239000012071 phase Substances 0.000 claims abstract description 25
- 239000008346 aqueous phase Substances 0.000 claims abstract description 16
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 239000004696 Poly ether ether ketone Substances 0.000 claims abstract description 9
- 229920002530 polyetherether ketone Polymers 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims abstract description 4
- 238000009826 distribution Methods 0.000 claims description 22
- 239000012530 fluid Substances 0.000 claims description 21
- 239000011435 rock Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000011160 research Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 22
- 239000011148 porous material Substances 0.000 description 6
- 238000002591 computed tomography Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000003209 petroleum derivative Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 230000000007 visual 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
- 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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- Physics & Mathematics (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
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Abstract
A CT digital core-based microscopic displacement experiment system comprises a core gripper (4) and a microscopic displacement device. The core gripper (4) comprises an inlet end (4-1), an outlet end (4-2), a core area, and a housing. The housing is made of a polyetheretherketone (PEEK) material. The microscopic displacement device comprises an oil-phase intermediate container (2) and an aqueous-phase intermediate container (3) that are parallel, and comprises an advection pump (1) used for driving the oil-phase intermediate container (2) and the aqueous-phase intermediate container (3). Liquid discharge ends of the oil-phase intermediate container (2) and the aqueous-phase intermediate container (3) are each connected to the inlet end (4-1) of the core gripper (4). The core gripper (4) pressurizes a core gripped in the core gripper (4) by means of a hand pump (5). The outlet end (4-2) of the core gripper (4) is provided with a measurement bottle (7). The system is applicable to a small-capacity and small-scale microscopic displacement experiment, and the comprised technical device has a higher operation precision and a higher measurement precision compared with a conventional displacement experiment device.
Description
Description A CT Digital Rock-Based Microscopic Displacement Experimental System and Microscopic Displacement Experimental Method
Technical Field
The present invention relates to a CT digital rock-based microscopic displacement experiment system and microscopic displacement experiment method, which belongs to the technical field of physical experiments for petroleum and natural gas.
Background Art
The final purpose of oilfield development is to extract as much crude oil as possible from formation pores to reduce resource wastes. Crude oil is preserved in the pores of rocks e.g. sedimentary stone that are usually thousands of meters away from the ground. Due to the complexity in sedimentary environments as well as in fluid distribution in formations, it is impossible for people to directly and extensively know underground oil-water distribution. The major problems of oilfield development include how to know about enrichment areas and enrichment forms of the underground crude oil and how to determine the distribution of the oil remained in reservoir stratum, and these problems are also important subjects that have not yet been fully resolved in petroleum upstream industries. The study on the distribution of the remaining oil is conducted from a microscopic even nano-scale perspective to master the microscopic formation mechanism and distribution pattern of the remaining oil, thus exhibiting the status quo of the oil reservoir exploitation vividly. The study on improvement of the recovery on this basis lays an important foundation for the decision-making of the oil reservoir management. Consequently, microscopic displacement experiments and subsequent researches on fluid distribution have been paid great attention by various oil-producing countries.
The methods commonly adopted for the researches on fluid distribution in porous media mainly include the microscopic physical experiments and numerical simulation. The computational simulation is a method in which the physical properties of oil reservoir and the flow and distribution patterns of fluids are studied through the establishment of mathematical models.
Although this method has been widely applied, there are still obvious uncertainties. The microscopic physical revelation is a method in which the microscopic seepage process of fluids in reservoir strata is studied by means of amplifying, video-recording and image processing technologies of microscopes so as to reveal the microscopic distribution features of fluids in porous media. Currently, the microscopic physical method is mainly dominated by designed models and two-dimensional views. However, these manmade models are unable to fully 1 simulate all the features of cores, and fluids are always distributed in rock pores in a three-dimensional form. As a result, observations made simply from a two-dimensional perspective would be highly prone to cause unignored errors.
Summary of the Invention
To overcome the drawbacks existing in the prior art, the present invention provides a CT digital rock-based microscopic displacement experiment system.
The present invention also provides a method, which utilizes the above-mentioned experiment system to conduct microscopic displacement experiments. The present invention combines conventional microscopic displacement experiments with CT technologies effectively, and utilizes CT scanning technologies to scan cores of different displacement stages to observe core pore structures, and thus the changes in fluid distribution in the pores can be reproduced in real time. The Technical Solution of the Present Invention is as Follows: A CT digital rock-based microscopic displacement experiment system comprises a core holder and a microscopic displacement device.
The core holder comprises an inlet end, an outlet end, a core zone and a hard shell; the hard shell is made from polyetheretherketone (PEEK) material (HYPERLINK: "http://baike.baidu.com/view/949995.htm" \t "blank"), and PEEK (HYPERLINK: "http://baike.baidu.com/view/9693.htm" \t "_blank") is a special engineering plastic with excellent properties, including high-temperature resistance (260 °C), excellent mechanical properties, radiation resistance, good self-lubrication, resistance to chemical corrosion, etc.; the PEEK material is radiolucent as compared with metal, and the holder hard shell made therefrom does not affect the normal use of X-rays of CT devices. The existing traditional holder hard shells are made from metal materials, and thus cannot be penetrated by X-rays, so that CT devices cannot be utilized to obtain information regarding core displacement state by scanning. Furthermore, the size of traditional holders is relatively larger and inconsistent with that of CT-scanned samples, which affects scanning.
The microscopic displacement device comprises an oil phase container and a water phase container that are connected in parallel as well as a constant-flux pump for displacing the oil phase container and the aqueous phase container, the liquid discharging ends of the oil phase container and the aqueous phase container are both connected with the inlet end of the core holder, the core holder pressurizes a core held therein via a hand pump, and a measuring flask is disposed at the outlet end of the core holder.
Preferably according to the present invention, a rotary seat is disposed at the bottom of the core holder. The rotary seat is used for fixing the core holder on a CT sample table during CT scanning, and is removed during a displacement experiment so that the core holder can proceed to the 2 displacement process.
Preferably according to the present invention, the oil phase container and the aqueous phase container each have a volume of 50 to 150 mL.
Preferably according to the present invention, a pressure gauge is disposed at a line between the hand pump and the core holder, and the pressure gauge has a measurement range of 10 MPa, with the accuracy being 0.25 MPa.
Preferably according to the present invention, an inlet pressure gauge is disposed at the inlet end of the core holder, and the inlet pressure gauge has a measurement range of 6 MPa, with the accuracy error being 0.25 MPa.
The method utilizing the above-mentioned experiment system to conduct microscopic displacement experiments comprises the following steps: 1) mounting a core in the core holder after drying, placing the core holder in Zeiss MCT-400 CT for positioning, scanning the core, and obtaining the three-dimensional digital rock data of objective areas; 2) connecting the core holder to a displacement device, and conducting a single aqueous phase displacement experiment, a single oil phase displacement experiment or a water/oil phase mixed displacement experiment on the core; 3) designing observation time points, i.e. displacement time, according to the contents studied in the displacement experiments, suspending the displacement for the core at the observation time, and closing the outlet end and inlet end of the core holder as well as the hand pump; 4) placing the core holder in Zeiss MCT-400 CT facility for scanning, and obtaining fluid distributions in the core at the displacement time; and 5) repeating steps 2) to 4) until the fluid distributions in the core are obtained in accordance with all the designed observation time points in step 3).
Preferably according to the present invention, the core in step 1) has a diameter of 1 to 2 cm and a length of 2 to 4 cm.
The present invention has the advantages that: 1. With a core obtained in the field being used, the present invention guarantees experimental reliability by revealing the pore structure of oil reservoir and simulating the flow condition of fluids in oil reservoir to a maximal extent. Besides, it is easier for a core sample having a diameter of 1 to 2 cm to attain accurate CT scanning results than a standard core sample having a diameter of 2.5 cm. 2. The experimental method of the present invention can not only measure data through experiments, but also enable a visual analysis of fluid distributions within the core at different displacement stages. 3 3. The system and method of the present invention not only can obtain the three-dimensional distribution of fluids in porous media, but also ensures that the accuracy of the fluid distribution results originating from measurements is more consistent with the actual situation when compared with the two-dimensional fluid distribution results. 4. The present invention allows a wide variety of indoor displacement experiments in petroleum industry to be conducted, and can simulate lots of displacement modes and displacement conditions. 5. The system of the present invention is applicable for small-volume, small-scale microscopic displacement experiments, with the technical devices involved having higher operating accuracy and measurement accuracy than conventional displacement experiment devices.
Brief Description of the Drawings
Fig. 1 is a structural connection diagram of the displacement system of the present invention.
As indicated in Fig. 1, 1: constant-flux pump, 2: oil phase container; 3: aqueous phase container; 4: core holder; 4-1: inlet end; 4-2: outlet end; 5: hand pump; 6: pressure gauge disposed between core holder and hand pump; 7: measuring flask.
Fig. 2 is a diagram illustrating fluid distribution in a digital rock at a particular time obtained by scanning according to the displacement experiment method of the present invention.
Detailed Description of the Invention
The present invention will be described below in details in connection with the embodiments and the drawings of description, but is not limited thereto.
Reference is made to what is shown in Fig. 1 and Fig. 2.
Embodiment 1 A CT digital rock-based microscopic displacement experiment system comprises a core holder and a microscopic displacement device.
The core holder 4 comprises an inlet end 4-1, an outlet end 4-2, a core zone and a hard shell; The hard shell is made from a polyetheretherketone (PEEK) material HYPERLINK "http://baike.baidu.com/view/949995.htm" \t "_blank";
The microscopic displacement device comprises an oil phase container 2 and a water phase container 3 that are connected in parallel as well as a constant-flux pump 1 for displacing the oil phase container 2 and the aqueous phase container 3, the liquid discharging ends of the oil phase container 2 and the aqueous phase container 3 are both connected with the inlet end 4-1 of the core holder 4, hand pump 5 provides confining pressure to core sample held in core holder 4, and a flowmeter 7 is disposed at the outlet end 4-2 of the core holder 4.
Embodiment 2 A CT digital rock-based microscopic displacement experiment system according to embodiment 1 4 differs in that a rotary seat is disposed at the bottom of the core holder 4. The rotary seat is used for fixing the core holder on a sample table during CT scanning. And it is removed during a displacement experiment.
Embodiment 3 A CT digital rock-based microscopic displacement experiment system according to embodiment 1 differs in that the oil phase container 2 and the aqueous phase container 3 each have a volume of 50 to 150 mL. A pressure gauge 6 is disposed between the hand pump 5 and the core holder 4, and the pressure gauge 6 has a measurement range of 10 MPa, with the accuracy being 0.25 MPa.
An inlet pressure gauge is disposed at the inlet end 4-1 of the core holder 4, and the inlet pressure gauge has a measurement range of 6 MPa, with the accuracy being 0.25 MPa.
Embodiment 4
The method utilizing the experiment system according to any of embodiments 1 to 3 to conduct microscopic displacement experiments comprises the following steps of: 1) mounting a dry core in the core holder 4, placing the core holder in Zeiss MCT-400 CT for positioning, scanning the core, and obtaining the three-dimensional digital rock data of object areas; 2) connecting the core holder 4 to a displacement device, and conducting a single aqueous phase displacement experiment, a single oil phase displacement experiment or a water/oil phase mixed displacement experiment on the core; 3) designing observation time points which means different displacement time, according to the research contents, suspending the displacement at the observation time, and closing the outlet end 4-2 and inlet end 4-1 of the core holder as well as the hand pump 5; 4) placing the core holder 4 in Zeiss MCT-400 CT for scanning, and obtaining fluid distributions in the core at different displacement time; and 5) repeating steps 2) to 4) until the fluid distributions in the core are obtained in accordance with all the designed observation time points in step 3).
The core in step 1) has a diameter of 1 to 2 cm and a length of 2 to 4 cm.
It can be seen from Fig. 2 that fluid distributions in a core can be monitored in real-time by using of CT scanning. 5
Claims (7)
- Claims1. A CT digital rock-based microscopic displacement experiment system, characterized in that the system comprises a core holder and a microscopic displacement device; The core holder comprises an inlet end, an outlet end, a core zone and a hard shell; the hard shell is made from a polyetheretherketone material HYPERLINK "http://baike.baidu.com/view/949995.htm" \t " blank", the microscopic displacement device comprises an oil phase container and a water phase container that are connected in parallel as well as a constant-flux pump for displacing the oil phase container and the aqueous phase container, the liquid discharging ends of the oil phase container and the aqueous phase container are both connected with the inlet end of the core holder, the core holder provides confing pressure to a core held therein via a hand pump, and a flowmeter is disposed at the outlet end of the core holder.
- 2. The CT digital rock-based microscopic displacement experiment system according to claim 1, characterized in that a rotary seat is disposed at the bottom of the core holder.
- 3. The CT digital rock-based microscopic displacement experiment system according to claim 1, characterized in that the oil phase container and the aqueous phase container each have a volume of 50 to 150 mL.
- 4. The CT digital rock-based microscopic displacement experiment system according to claim 1, characterized in that a pressure gauge is disposed on a line between the hand pump and the core holder, and the pressure gauge has a measurement range of 10 MPa, with the accuracy being 0.25 MPa.
- 5. The CT digital rock-based microscopic displacement experiment system according to claim 1, characterized in that a pressure gauge is disposed at the inlet end of the core holder, and the inlet pressure gauge has a measurement range of 6 MPa, with the accuracy being 0.25 MPa.
- 6. A method utilizing the experiment system according to any of claims 1 to 5 to conduct microscopic displacement experiments, characterized in that the method comprises the following steps of: 1) mounting a dry core in the core holder, placing the core holder in Zeiss MCT-400 CT for positioning, scanning the core, and obtaining the three-dimensional digital rock data of object areas; 2) connecting the core holder to a displacement device, and conducting a single aqueous phase displacement experiment, a single oil phase displacement experiment or a water/oil phase mixed displacement experiment on the core; 3) designing observation time points which means displacement time, according to the research contents, suspending the displacement at the observation time, and closing the outlet end and inlet end of the core holder as well as the hand pump; 4) placing the core holder in Zeiss MCT-400 CT for scanning, and obtaining fluid distributions in the core at different displacement time; and 5) repeating steps 2) to 4) until the fluid distributions in the core are obtained in accordance with all the designed observation time points in step 3).
- 7. The experiment method according to claim 6, characterized in that the core in step 1) has a diameter of 1 to 2 cm and a length of 2 to 4 cm.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510236593.6 | 2015-05-11 | ||
| CN201510236593.6A CN104819990A (en) | 2015-05-11 | 2015-05-11 | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
| PCT/CN2016/080031 WO2016180215A1 (en) | 2015-05-11 | 2016-04-22 | Ct digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
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| AU2016260347A1 true AU2016260347A1 (en) | 2017-04-27 |
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| AU2016260347A Pending AU2016260347A1 (en) | 2015-05-11 | 2016-04-22 | CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
| AU2016102347A Ceased AU2016102347A4 (en) | 2015-05-11 | 2016-04-22 | CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
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| AU2016102347A Ceased AU2016102347A4 (en) | 2015-05-11 | 2016-04-22 | CT digital core-based microscopic displacement experiment system and microscopic displacement experiment method |
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| CN (1) | CN104819990A (en) |
| AU (2) | AU2016260347A1 (en) |
| WO (1) | WO2016180215A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104819990A (en) * | 2015-05-11 | 2015-08-05 | 中国石油大学(华东) | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
| CN105784939A (en) * | 2016-03-21 | 2016-07-20 | 西南石油大学 | Underground gas storage reservoir simulating experimental device and experimental 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 |
| CN107725016B (en) * | 2016-08-11 | 2020-10-09 | 中国石油天然气股份有限公司 | One-unit driving experimental device |
| CN108872230A (en) * | 2017-05-10 | 2018-11-23 | 中国石油天然气股份有限公司 | CO2Evaluation method and device for improving residual oil displacement effect by emulsion huff and puff |
| 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 |
| CN108169261B (en) * | 2018-01-05 | 2021-02-19 | 四川省川建勘察设计院有限公司 | Rock core holder for CT scanning |
| 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 |
| CN109060608A (en) * | 2018-07-09 | 2018-12-21 | 西南石油大学 | The multiple dimensioned water seal mechanism of qi reason visual experimental apparatus of high temperature and pressure and method |
| CN111735831B (en) * | 2019-12-18 | 2023-01-17 | 中国石油大学(华东) | Three-dimensional visual reciprocating type cyclic displacement system |
| CN113327832B (en) * | 2020-02-28 | 2024-06-25 | 中国石油天然气股份有限公司 | Rock core accommodating assembly, oil displacement experiment system and method |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4663711A (en) * | 1984-06-22 | 1987-05-05 | Shell Oil Company | Method of analyzing fluid saturation using computerized axial tomography |
| US5109398A (en) * | 1990-02-22 | 1992-04-28 | Bp America Inc. | Vertical core flow testing apparatus and method with computed tomography scanning |
| CN102095740B (en) * | 2010-12-17 | 2012-08-08 | 中国石油天然气股份有限公司 | CT scanning heterogeneous model test system |
| CN102809528B (en) * | 2012-08-03 | 2015-02-25 | 中国石油天然气股份有限公司 | Three-phase Relative Permeability Test System Based on CT Scanning |
| CN102809518B (en) * | 2012-08-27 | 2014-04-02 | 中国石油大学(华东) | Device and method for measuring gas phase saturation of parallel core during foam displacement |
| CN103063687A (en) * | 2013-01-06 | 2013-04-24 | 中国石油大学(华东) | Device for acquiring and testing microcosmic distribution image of remaining oil in porous medium |
| CN103091346B (en) * | 2013-01-18 | 2016-03-30 | 上海大学 | A kind of visual evaluating method of rock core displacement effect |
| CN203161194U (en) * | 2013-01-30 | 2013-08-28 | 刘怀珠 | Data collection control device in process of displacement of chemical flooding physical model system |
| CN103257101B (en) * | 2013-05-24 | 2014-11-12 | 中国石油大学(北京) | Coating-containing core as well as core holder anti-corrosion method and core displacement experiment method |
| CN203443906U (en) * | 2013-08-15 | 2014-02-19 | 中国石油天然气股份有限公司 | Experimental device for scanning heterogeneous model by utilizing CT |
| CN103556994B (en) * | 2013-11-19 | 2016-11-23 | 中国石油大学(华东) | The experiment detecting system of fractured-vuggy reservoir remaining oil distribution and detection method |
| CN103954544B (en) * | 2014-05-13 | 2016-08-24 | 中国石油大学(北京) | A kind of polymer control water increases experimental provision and the experimental technique of gas effect assessment |
| CN104819990A (en) * | 2015-05-11 | 2015-08-05 | 中国石油大学(华东) | Microscopic displacement experimental system and microscopic displacement experimental method based on CT digital core |
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2015
- 2015-05-11 CN CN201510236593.6A patent/CN104819990A/en active Pending
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2016
- 2016-04-22 AU AU2016260347A patent/AU2016260347A1/en active Pending
- 2016-04-22 WO PCT/CN2016/080031 patent/WO2016180215A1/en active Application Filing
- 2016-04-22 AU AU2016102347A patent/AU2016102347A4/en not_active Ceased
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| CN104819990A (en) | 2015-08-05 |
| WO2016180215A1 (en) | 2016-11-17 |
| AU2016102347A4 (en) | 2017-07-27 |
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