CN104792662A - CO2-brine contact angle measuring method based on micro-focus X-ray CT - Google Patents
CO2-brine contact angle measuring method based on micro-focus X-ray CT Download PDFInfo
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- CN104792662A CN104792662A CN201510158532.2A CN201510158532A CN104792662A CN 104792662 A CN104792662 A CN 104792662A CN 201510158532 A CN201510158532 A CN 201510158532A CN 104792662 A CN104792662 A CN 104792662A
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- salt solution
- contact angle
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- injection pump
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Abstract
The invention belongs to the technical field of scientific research on petroleum and relates to a CO2-brine contact angle measuring method based on micro-focus X-ray CT. The measuring method comprises a rock core displacement process and a micro-focus X-ray CT shooting and image post-processing process. Pore-level in-situ measurement of CO2-brine contact angles is realized with the method. The CO2-brine contact angles in different positions and in different pores of rock cores can be measured after one-time shooting, and compared with traditional methods, the method consumes less time and is smaller in measurement result error. The method is applied to actual rock cores instead of smooth and ideal materials, and effects caused by surface roughness, mineral composition, heterogeneity of pore structures and the like on the CO2-brine contact angles are considered. The method is applicable to measurement of CO2-brine balance contact angles, retreat contact angles and advance contact angles and wide in measurement range. Measurement results are directly used as input parameters for numerical simulation and can be popularized to contact angle measurement of any gas-liquid-solid or liquid-liquid-solid three-phase systems.
Description
Technical field
The invention belongs to oil scientific research technical field, relate to a kind of CO based on microfocus X-ray CT
2-saline contacts angle measuring method.
Background technology
Along with the development of commercial production and mankind's activity, greenhouse effect are serious threat earth environment.The environmental problem become increasingly conspicuous become human social development must faced by challenge, actively take measures reduce CO
2discharge extremely urgent, CO
2geological storage technology receives publicity due to its huge amount of sealing up for safekeeping and higher feasibility, and the Multiphase Flow in porous medium is the main contents of its research, and capillary force and relative permeability are the main macroscopic parameters of the Multiphase Flow in characterizing porous medium, and CO
2how accurately-saline contacts angle is again the important parameter affecting capillary force and relative permeability, therefore study the measurement CO of reality
2-saline contacts angle is for CO
2the development of geological storage technology is significant.
Traditional C O
2-saline contacts angle measuring method adopts dynamic sessile drop method to measure mostly, but it has following shortcoming: one, even if in a simple measurement system, and measurement result data sparseness and inconsistent; They are two, the CO of measurement gained years old
2-saline contacts angle is a definite value, and this and actual conditions are not inconsistent; Its three, owing to have employed desirable smooth test material, have ignored surface roughness, mineral composition and pore texture nonuniformity etc. to CO
2the impact at-saline contacts angle; Its four, once test can only carry out a CO
2-saline contacts angular measurement, error is comparatively large, and test macro requires higher to test material and reactor.
Summary of the invention
Microfocus X-ray CT imaging technique, as a kind of advanced Dynamic Non-Destruction Measurement with high-resolution, is referred to CO in recent years
2the research in geological storage field, in order to solve traditional C O
2the limitation of-saline contacts angle measuring method is with not enough, and the present invention proposes a kind of CO based on microfocus X-ray CT
2-saline contacts angle measuring method, object is the CO of actual core under Measurement accuracy storage condition
2-saline contacts angle, realizes CO
2the pore scale in site measurement at-saline contacts angle.Measuring method mainly comprises two processes: core flooding process and microfocus X-ray CT take and post processing of image process.
Technical scheme of the present invention is: a kind of CO based on microfocus X-ray CT
2-saline contacts angle measuring method, mainly comprises the following steps:
Rock core fastener is placed on CT objective table by step 1., salt solution injection pump and CO
2injection pump is connected with rock core fastener one end by pipeline, and back pressure pump is connected with the rock core fastener other end by pipeline, in order to obtain accurately measurement image clearly, should ensure that microfocus X-ray CT reaches pore scale resolution.
Inject 50 times of volume of voids salt solution by salt solution injection pump after whole connecting line vacuumizes by step 2., controlled pressure and temperature slowly rise to concrete working condition requirement, leave standstill 12 hours, make core fully saturated by salt solution.
Step 3. utilizes salt solution injection pump to inject the saturated CO of 1000 times of volume of voids
2salt solution in salt solution displacement step 2, guarantees that core is by CO
2salt solution 100% is saturated, and core particle surface reaches capacity steady state (SS).
Step 4.CO
2-saline contacts angle comprises: CO
2-salt solution equilibrium contact angle, CO
2-salt solution advancing contact angle and CO
2-salt water receding contact angle, for different CO
2-saline contacts angle adopt respectively step 5,6 or 7 injection mode.
Step 5. utilizes salt solution injection pump and CO
2injection pump injects 20 volume of voids CO altogether with lower same traffic simultaneously
2with saturated CO
2salt solution, ensures that capillary number is about 10
-6, leave standstill 6 hours;
Step 6. utilizes CO
2injection pump injects 20 volume of voids CO with comparatively low discharge
2, ensure that capillary number is about 10
-6, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes CO
2start the time of displacement salt solution;
Step 7. utilizes CO
2injection pump injects 20 volume of voids CO with comparatively low discharge
2, ensure that capillary number is about 10
-6, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes CO
2start the time of displacement salt solution.Then salt solution injection pump is utilized to inject the saturated CO of 20 volume of voids with same traffic
2salt solution, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes saturated CO
2salt solution starts displacement CO
2time.Make CO
2become residual phase to stay in hole.
Microfocus X-ray CT is utilized to carry out 3D scanning after step 8. end step 5,6 or 7.That step 5 obtains is CO
2-salt solution equilibrium contact angle, if core 3 is hydrophilic, then that step 6 obtains is CO
2-salt water receding contact angle, that step 7 obtains is CO
2-salt solution advancing contact angle; If the close CO of core 3
2, then that step 6 obtains is CO
2-salt solution advancing contact angle, that step 7 obtains is CO
2-salt water receding contact angle.
Step 9. utilizes computing machine to the process of CT Image Segmentation Using, obtains the CO in core diverse location different aperture
2-saline contacts angle.
The invention has the beneficial effects as follows:
1. utilize the CO based on microfocus X-ray CT
2-saline contacts angle measuring method, achieves CO
2the pore-level in site measurement at-saline contacts angle.
2. the CO in core diverse location different aperture after once taking, can be measured
2-saline contacts angle, compares classic method measurement few measuring result error consuming time less.
3. measuring method is used for actual core and Non-smooth surface ideal material, consider surface roughness, mineral composition and pore texture nonuniformity etc. to CO
2the impact at-saline contacts angle.
4. measuring method is applicable to CO
2-salt solution equilibrium contact angle, receding contact angle and advancing contact angle are measured, and measurement range is wider.
5. measurement result can directly as the input parameter of numerical simulation, and measuring method can be generalized to the Contact-angle measurement of any gas-liquid-solid or liquid-liquid-solid three-phase system.
Accompanying drawing explanation
Accompanying drawing is a kind of CO based on microfocus X-ray CT
2-saline contacts angle measuring method schematic diagram.
In figure: 1 salt solution injection pump; 2CO
2injection pump; 3 cores; 4 rock core fasteners; 5 emissive sources;
6 receivers; 7 microfocus X-ray CT; 8 back pressure pump; 9 computing machines.
Embodiment
The specific embodiment of the present invention is described in detail below in conjunction with technical scheme and accompanying drawing.
Rock core fastener 4 is placed on CT objective table by step 1., salt solution injection pump 1 and CO
2injection pump 2 is connected with rock core fastener 4 one end by pipeline, and back pressure pump 8 is connected with rock core fastener 4 other end by pipeline, in order to obtain accurately measurement image clearly, should ensure that microfocus X-ray CT 7 reaches pore scale resolution.
Inject 50 times of volume of voids salt solution by salt solution injection pump 1 after whole connecting line vacuumizes by step 2., controlled pressure and temperature slowly rise to concrete working condition requirement, leave standstill 12 hours, make core 3 fully saturated by salt solution.
Step 3. utilizes salt solution injection pump 1 to inject the saturated CO of 1000 times of volume of voids
2salt solution in salt solution displacement step 2, guarantees that core 3 is by CO
2salt solution 100% is saturated, and core 3 particle surface reaches capacity steady state (SS).
Step 4.CO
2-saline contacts angle comprises: CO
2-salt solution equilibrium contact angle, CO
2-salt solution advancing contact angle and CO
2-salt water receding contact angle, for different CO
2-saline contacts angle adopt respectively step 5,6 or 7 injection mode.
Step 5. utilizes salt solution injection pump 1 and CO
2injection pump 2 injects 20 volume of voids CO altogether with lower same traffic simultaneously
2with saturated CO
2salt solution, ensures that capillary number is about 10
-6, leave standstill 6 hours;
Step 6. utilizes CO
2injection pump 2 injects 20 volume of voids CO with comparatively low discharge
2, ensure that capillary number is about 10
-6, sustainable utilization microfocus X-ray CT 7 carries out 2D scanning and observes CO
2start the time of displacement salt solution;
Step 7. utilizes CO
2injection pump 2 injects 20 volume of voids CO with comparatively low discharge
2, ensure that capillary number is about 10
-6, sustainable utilization microfocus X-ray CT 7 carries out 2D scanning and observes CO
2start the time of displacement salt solution.Then salt solution injection pump 1 is utilized to inject the saturated CO of 20 volume of voids with same traffic
2salt solution, sustainable utilization microfocus X-ray CT 7 carries out 2D scanning and observes saturated CO
2salt solution starts displacement CO
2time.Make CO
2become residual phase to stay in hole.
Microfocus X-ray CT 7 is utilized to carry out 3D scanning after step 8. end step 5,6 or 7.That step 5 obtains is CO
2-salt solution equilibrium contact angle, if core 3 is hydrophilic, then that step 6 obtains is CO
2-salt water receding contact angle, that step 7 obtains is CO
2-salt solution advancing contact angle; If the close CO of core 3
2, then that step 6 obtains is CO
2-salt solution advancing contact angle, that step 7 obtains is CO
2-salt water receding contact angle.
Step 9. utilizes the process of computing machine 9 pairs of CT Image Segmentation Usings, obtains the CO in core 3 diverse location different aperture
2-saline contacts angle.
Claims (1)
1. the CO based on microfocus X-ray CT
2-saline contacts angle measuring method, is characterized in that, step is as follows:
Rock core fastener is placed on CT objective table by step 1., salt solution injection pump and CO
2injection pump is connected with rock core fastener one end by pipeline, and back pressure pump is connected with the rock core fastener other end by pipeline;
Inject 50 times of volume of voids salt solution by salt solution injection pump after pipeline vacuumizes by step 2., controlled pressure and temperature slowly rise to working condition requirement, leave standstill 12 hours, make core fully saturated by salt solution;
Step 3. utilizes salt solution injection pump to inject the saturated CO of 1000 times of volume of voids
2salt solution in salt solution displacement step 2, guarantees that core is by CO
2salt solution 100% is saturated, and core particle surface reaches capacity steady state (SS);
Step 4.CO
2-saline contacts angle comprises: CO
2-salt solution equilibrium contact angle, CO
2-salt solution advancing contact angle and CO
2-salt water receding contact angle, for different CO
2-saline contacts angle adopt respectively step 5,6 or 7 injection mode;
Step 5. utilizes salt solution injection pump and CO
2injection pump with same traffic inject 20 times of volume of voids CO altogether simultaneously
2with saturated CO
2salt solution, ensures that capillary number is 10
-6, leave standstill 6 hours;
Step 6. utilizes CO
2injection pump injects 20 times of volume of voids CO
2, ensure that capillary number is 10
-6, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes CO
2start the time of displacement salt solution;
Step 7. utilizes CO
2injection pump injects 20 times of volume of voids CO
2, ensure that capillary number is 10
-6, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes CO
2start the time of displacement salt solution, then utilize salt solution injection pump to inject 20 times of saturated CO of volume of voids with same traffic
2salt solution, sustainable utilization microfocus X-ray CT carries out 2D scanning and observes saturated CO
2salt solution starts displacement CO
2time, make CO
2becoming residual phase stays in hole;
Microfocus X-ray CT is utilized to carry out 3D scanning after step 8. end step 5, step 6 or step 7; That step 5 obtains is CO
2-salt solution equilibrium contact angle; If core is hydrophilic, then that step 6 obtains is CO
2-salt water receding contact angle, that step 7 obtains is CO
2-salt solution advancing contact angle; If core parent is CO
2, then that step 6 obtains is CO
2-salt solution advancing contact angle, that step 7 obtains is CO
2-salt water receding contact angle;
Step 9. utilizes computing machine to the process of CT Image Segmentation Using, obtains the CO in core diverse location different aperture
2-saline contacts angle.
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| CN201510158532.2A CN104792662B (en) | 2015-04-03 | 2015-04-03 | A kind of CO based on Microfocus X-ray X ray CT2Saline contacts angle measuring method |
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|---|---|---|---|
| CN201510158532.2A CN104792662B (en) | 2015-04-03 | 2015-04-03 | A kind of CO based on Microfocus X-ray X ray CT2Saline contacts angle measuring method |
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Cited By (9)
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|---|---|---|---|---|
| CN105628560A (en) * | 2015-12-25 | 2016-06-01 | 大连理工大学 | Experimental device for measuring contact angles of CO2-saline water-rock system |
| CN106383133A (en) * | 2016-10-21 | 2017-02-08 | 大连理工大学 | Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology |
| CN107680087A (en) * | 2017-09-29 | 2018-02-09 | 大连理工大学 | One kind is using CO in CT measurement porous medias2The method of rate of dissolution in salt solution |
| CN107831179A (en) * | 2017-07-28 | 2018-03-23 | 中国石油化工股份有限公司 | Utilize the experimental provision at x-ray projection method measure rock surface oil water contact angle |
| CN108593501A (en) * | 2018-04-28 | 2018-09-28 | 中国石油大学(华东) | A kind of contact angle of porous media determines method and system |
| CN108717064A (en) * | 2018-05-10 | 2018-10-30 | 上海交通大学 | A kind of more outfield material structures of Microfocus X-ray X-ray and performance fibers characterization technique |
| CN109085095A (en) * | 2018-08-08 | 2018-12-25 | 长安大学 | A kind of soil contact angle test device and method |
| CN109186500A (en) * | 2018-09-27 | 2019-01-11 | 西安交通大学 | The contact angle acquisition methods of liquid-liquid diphase displacement image in a kind of micron capillary column |
| CN117169259A (en) * | 2023-09-11 | 2023-12-05 | 四川大学 | Perspective imaging method for carbon deposition inside metal structure by using salt solution as contrast agent |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105628560B (en) * | 2015-12-25 | 2018-04-10 | 大连理工大学 | One kind measurement CO2The experimental provision of/salt solution/rock system contact angle |
| CN105628560A (en) * | 2015-12-25 | 2016-06-01 | 大连理工大学 | Experimental device for measuring contact angles of CO2-saline water-rock system |
| CN106383133B (en) * | 2016-10-21 | 2019-03-05 | 大连理工大学 | A kind of CO based on X ray CT imaging technique2Salt water-core system capillary pressure force measuring method |
| CN106383133A (en) * | 2016-10-21 | 2017-02-08 | 大连理工大学 | Method for measuring capillary pressure of CO2-saline-core system based on X-ray computed tomography (CT) technology |
| CN107831179A (en) * | 2017-07-28 | 2018-03-23 | 中国石油化工股份有限公司 | Utilize the experimental provision at x-ray projection method measure rock surface oil water contact angle |
| CN107680087A (en) * | 2017-09-29 | 2018-02-09 | 大连理工大学 | One kind is using CO in CT measurement porous medias2The method of rate of dissolution in salt solution |
| CN107680087B (en) * | 2017-09-29 | 2019-12-27 | 大连理工大学 | Application of CT to measure CO in porous medium2Method for dissolution rate in brine |
| CN108593501A (en) * | 2018-04-28 | 2018-09-28 | 中国石油大学(华东) | A kind of contact angle of porous media determines method and system |
| US10969321B2 (en) * | 2018-04-28 | 2021-04-06 | China University Of Petroleum (East China) | Method and system for determining contact angle of porous media |
| CN108717064B (en) * | 2018-05-10 | 2021-04-13 | 上海交通大学 | Micro-characterization technology for structure and performance of micro-focus X-ray multi-external-field material |
| CN108717064A (en) * | 2018-05-10 | 2018-10-30 | 上海交通大学 | A kind of more outfield material structures of Microfocus X-ray X-ray and performance fibers characterization technique |
| CN109085095A (en) * | 2018-08-08 | 2018-12-25 | 长安大学 | A kind of soil contact angle test device and method |
| CN109085095B (en) * | 2018-08-08 | 2021-07-23 | 长安大学 | Soil contact angle testing device and method |
| CN109186500A (en) * | 2018-09-27 | 2019-01-11 | 西安交通大学 | The contact angle acquisition methods of liquid-liquid diphase displacement image in a kind of micron capillary column |
| CN117169259A (en) * | 2023-09-11 | 2023-12-05 | 四川大学 | Perspective imaging method for carbon deposition inside metal structure by using salt solution as contrast agent |
| CN117169259B (en) * | 2023-09-11 | 2024-04-09 | 四川大学 | Perspective imaging method for carbon deposition inside metal structure by using salt solution as contrast agent |
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Inventor after: Song Yongchen Inventor after: Lv Pengfei Inventor after: Liu Yu Inventor after: Jiang Lanlan Inventor after: Teng Ying Inventor after: Wu Bohao Inventor after: Lu Guohuan Inventor after: Wang Mengting Inventor before: Lv Pengfei Inventor before: Song Yongchen Inventor before: Liu Yu Inventor before: Jiang Lanlan Inventor before: Teng Ying Inventor before: Wu Bohao Inventor before: Lu Guohuan Inventor before: Wang Mengting |