CN104792662B - A kind of CO based on Microfocus X-ray X ray CT2Saline contacts angle measuring method - Google Patents
A kind of CO based on Microfocus X-ray X ray CT2Saline contacts angle measuring method Download PDFInfo
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Abstract
The invention belongs to oil scientific research technical field, it is related to a kind of CO based on Microfocus X-ray X ray CT2Saline contacts angle measuring method.Measuring method includes that core flooding process and Microfocus X-ray X ray CT shoot and post processing of image process.This method realizes CO2The hole level in site measurement at saline contacts angle.The CO in core diverse location different aperture can be measured after once shooting2Saline contacts angle, few measuring result error time-consuming compared to conventional method measurement is smaller.This method Non-smooth surface ideal material for actual core, it is contemplated that anisotropism of surface roughness, mineral composition and pore structure etc. is to CO2The influence at saline contacts angle.This method is applied to CO2Salt solution equilibrium contact angle, receding contact angle and advancing contact angle measurement, measurement range are wider.Measurement result can be generalized to the Contact-angle measurement of any gas-liquid-solid or liquid-liquid-solid three-phase system directly as the |input paramete of numerical simulation.
Description
Technical field
The invention belongs to oil scientific research technical field, it is related to a kind of CO based on Microfocus X-ray X ray CT2- saline contacts
Angle measuring method.
Background technology
With continuing to develop for industrial production and mankind's activity, greenhouse effects seriously threaten earth environment.Become increasingly conspicuous
Environmental problem turn into the challenge that must face of human social development, actively take measures to reduce CO2Discharge it is extremely urgent, CO2
Geological storage technology is attracted attention due to its huge amount of sealing up for safekeeping and feasibility higher, and the Multiphase Flow in porous media is
The main contents of its research, capillary force and relative permeability are the main macroscopic ginsengs for characterizing the Multiphase Flow in porous media
Number, and CO2- saline contacts angle is again the important parameter for influenceing capillary force and relative permeability, therefore how accurate research is real
The measurement CO on border2- saline contacts angle is for CO2The development of geological storage technology is significant.
Traditional CO2- saline contacts angle measuring method is measured using dynamic sessile drop method mostly, but it has the disadvantage that：
Even if first, in a simple measurement system, measurement result data are rare and inconsistent；Second, the CO obtained by measurement2- salt
Water contact angle is a definite value, and this is not inconsistent with actual conditions；Third, as a result of preferable smooth test material, have ignored
Anisotropism of surface roughness, mineral composition and pore structure etc. is to CO2The influence at-saline contacts angle；Fourth, once testing
A CO can only be carried out2- saline contacts angular measurement, error is larger, and test system is higher to test material and reactor requirement.
The content of the invention
Microfocus X-ray X ray CT imaging technique as a kind of advanced Dynamic Non-Destruction Measurement with high-resolution, in recent years
It has been referred to CO2The research in geological storage field, in order to solve traditional CO2The limitation of-saline contacts angle measuring method with not
Foot, the present invention proposes a kind of CO based on Microfocus X-ray X ray CT2- saline contacts angle measuring method, purpose is sealed up for safekeeping for accurate measurement
Under the conditions of actual core CO2- saline contacts angle, realizes CO2The pore scale in site measurement at-saline contacts angle.Measuring method
Mainly include two processes：Core flooding process and Microfocus X-ray X ray CT shoot and post processing of image process.
The technical scheme is that：A kind of CO based on Microfocus X-ray X ray CT2- saline contacts angle measuring method, mainly
Comprise the following steps：
Be placed into rock core fastener on CT objective tables by step 1., salt solution injection pump and CO2Injection pump passes through pipeline and rock
Core holder one end is connected, and back pressure pump is connected by pipeline with the rock core fastener other end, in order to obtain accurately clearly measuring
Image, should ensure that Microfocus X-ray X ray CT reaches pore scale resolution ratio.
Step 2. injects 50 times of pore volume salt solution, control pressure after whole connecting line is vacuumized by salt solution injection pump
Power and temperature slowly rise to specific working condition requirement, stand 12 hours, make core by the abundant saturation of salt solution.
Step 3. injects 1000 times of saturation CO of pore volume using salt solution injection pump2Salt solution in salt solution displacement step 2, really
Core is protected by CO2The saturation of salt solution 100%, core particle surface reaches saturation stable state.
Step 4.CO2- saline contacts angle includes：CO2- salt solution equilibrium contact angle, CO2- salt solution advancing contact angle and CO2- salt
Water receding contact angle, for different CO2- saline contacts angle is respectively adopted the injection mode of step 5,6 or 7.
Step 5. utilizes salt solution injection pump and CO2Injection pump injects 20 pore volume altogether simultaneously with relatively low same traffic
CO2With saturation CO2Salt solution, it is ensured that capillary number is about 10-6, stand 6 hours；
Step 6. utilizes CO2Injection pump injects 20 pore volume CO with compared with low discharge2, it is ensured that capillary number is about 10-6, hold
It is continuous to carry out 2D scannings using Microfocus X-ray X ray CT to observe CO2Start the time of displacement salt solution；
Step 7. utilizes CO2Injection pump injects 20 pore volume CO with compared with low discharge2, it is ensured that capillary number is about 10-6, hold
It is continuous to carry out 2D scannings using Microfocus X-ray X ray CT to observe CO2Start the time of displacement salt solution.Then using salt solution injection pump with
Same traffic injects 20 pore volume saturation CO2Salt solution, sustainable utilization Microfocus X-ray X ray CT carries out 2D scannings to observe saturation
CO2Salt solution starts displacement CO2Time.Make CO2Stayed in hole as last phase.
After step 8. end step 5,6 or 7 3D scannings are carried out using Microfocus X-ray X ray CT.That step 5 is obtained is CO2- salt
Water balance contact angle, if core 3 is hydrophilic, that step 6 is obtained is CO2- salt water receding contact angle, what step 7 was obtained is CO2- salt
Water advancing contact angle；If the parent of core 3 CO2, then that step 6 is obtained is CO2- salt solution advancing contact angle, what step 7 was obtained is CO2-
Salt water receding contact angle.
Step 9. carries out dividing processing using computer to CT images, obtains the CO in core diverse location different aperture2-
Saline contacts angle.
The beneficial effects of the invention are as follows：
1. using the CO based on Microfocus X-ray X ray CT2- saline contacts angle measuring method, realizes CO2- saline contacts angle
Hole level in site measurement.
2. the CO in core diverse location different aperture can be measured after once shooting2- saline contacts angle, compared to tradition side
The time-consuming few measuring result error of method measurement is smaller.
3. measuring method is used for actual core and Non-smooth surface ideal material, it is contemplated that surface roughness, mineral composition and hole
Anisotropism of gap structure etc. is to CO2The influence at-saline contacts angle.
4. measuring method is applied to CO2The measurement of-salt solution equilibrium contact angle, receding contact angle and advancing contact angle, measures model
Enclose wider.
5. measurement result can directly as the |input paramete of numerical simulation, measuring method can be generalized to any solution-air-
Gu Gu or liquid-liquid-three-phase system Contact-angle measurement.
Brief description of the drawings
Accompanying drawing is a kind of CO based on Microfocus X-ray X ray CT2- saline contacts angle measuring method schematic diagram.
In figure：1 salt solution injection pump；2CO2Injection pump；3 cores；4 rock core fasteners；5 emission sources；
6 receivers；7 Microfocus X-ray X ray CTs；8 back pressure pumps；9 computers.
Specific embodiment
Specific embodiment of the invention is described in detail below in conjunction with technical scheme and accompanying drawing.
Be placed into rock core fastener 4 on CT objective tables by step 1., salt solution injection pump 1 and CO2Injection pump 2 by pipeline with
The one end of rock core fastener 4 is connected, and back pressure pump 8 is connected by pipeline with the other end of rock core fastener 4, in order to obtain accurately clearly
Measurement image, should ensure that Microfocus X-ray X ray CT 7 reaches pore scale resolution ratio.
Step 2. injects 50 times of pore volume salt solution after whole connecting line is vacuumized by salt solution injection pump 1, control
Pressure and temperature slowly rises to specific working condition requirement, stands 12 hours, makes core 3 by the abundant saturation of salt solution.
Step 3. injects 1000 times of saturation CO of pore volume using salt solution injection pump 12Salt solution in salt solution displacement step 2,
Ensure core 3 by CO2The saturation of salt solution 100%, the particle surface of core 3 reaches saturation stable state.
Step 4.CO2- saline contacts angle includes：CO2- salt solution equilibrium contact angle, CO2- salt solution advancing contact angle and CO2- salt
Water receding contact angle, for different CO2- saline contacts angle is respectively adopted the injection mode of step 5,6 or 7.
Step 5. is using salt solution injection pump 1 and CO2Injection pump 2 injects 20 pore-body altogether simultaneously with relatively low same traffic
Product CO2With saturation CO2Salt solution, it is ensured that capillary number is about 10-6, stand 6 hours；
Step 6. utilizes CO2Injection pump 2 injects 20 pore volume CO with compared with low discharge2, it is ensured that capillary number is about 10-6,
Sustainable utilization Microfocus X-ray X ray CT 7 carries out 2D scannings to observe CO2Start the time of displacement salt solution；
Step 7. utilizes CO2Injection pump 2 injects 20 pore volume CO with compared with low discharge2, it is ensured that capillary number is about 10-6,
Sustainable utilization Microfocus X-ray X ray CT 7 carries out 2D scannings to observe CO2Start the time of displacement salt solution.Then injected using salt solution
Pump 1 injects 20 pore volume saturation CO with same traffic2Salt solution, sustainable utilization Microfocus X-ray X ray CT 7 carries out 2D scannings to see
Examine saturation CO2Salt solution starts displacement CO2Time.Make CO2Stayed in hole as last phase.
After step 8. end step 5,6 or 7 3D scannings are carried out using Microfocus X-ray X ray CT 7.That step 5 is obtained is CO2-
Salt solution equilibrium contact angle, if core 3 is hydrophilic, that step 6 is obtained is CO2- salt water receding contact angle, what step 7 was obtained is CO2-
Salt solution advancing contact angle；If the parent of core 3 CO2, then that step 6 is obtained is CO2- salt solution advancing contact angle, what step 7 was obtained is
CO2- salt water receding contact angle.
Step 9. carries out dividing processing using computer 9 to CT images, obtains in the diverse location different aperture of core 3
CO2- saline contacts angle.
Claims (1)
1. a kind of CO based on Microfocus X-ray X ray CT2- saline contacts angle measuring method, it is characterised in that step is as follows：
Be placed into rock core fastener on CT objective tables by step 1., salt solution injection pump and CO2Injection pump is clamped by pipeline with core
Device one end is connected, and back pressure pump is connected by pipeline with the rock core fastener other end；
Step 2. injects 50 times of pore volume salt solution after pipeline is vacuumized by salt solution injection pump, and control pressure and temperature are slow
Working condition requirement is risen to, 12 hours are stood, makes core by the abundant saturation of salt solution；
Step 3. injects 1000 times of saturation CO of pore volume using salt solution injection pump2Salt solution in salt solution displacement step 2, it is ensured that rock
Core is by CO2The saturation of salt solution 100%, core particle surface reaches saturation stable state；
Step 4.CO2- saline contacts angle includes：CO2- salt solution equilibrium contact angle, CO2- salt solution advancing contact angle and CO2After-salt solution
Contact angle is moved back, for different CO2- saline contacts angle is respectively adopted the injection mode of step 5,6 or 7；
Step 5. utilizes salt solution injection pump and CO2Injection pump with same traffic inject 20 times of pore volume CO altogether simultaneously2With it is full
And CO2Salt solution, it is ensured that capillary number is 10-6, stand 6 hours；
Step 6. utilizes CO2Injection pump injects 20 times of pore volume CO2, it is ensured that capillary number is 10-6, sustainable utilization Microfocus X-ray X penetrates
Line CT carries out 2D scannings to observe CO2Start the time of displacement salt solution；
Step 7. utilizes CO2Injection pump injects 20 times of pore volume CO2, it is ensured that capillary number is 10-6, sustainable utilization Microfocus X-ray X penetrates
Line CT carries out 2D scannings to observe CO2Start the time of displacement salt solution, then inject 20 with same traffic using salt solution injection pump
Times pore volume saturation CO2Salt solution, sustainable utilization Microfocus X-ray X ray CT carries out 2D scannings to observe saturation CO2Salt solution starts displacement
CO2Time, make CO2Stayed in hole as last phase；
After step 8. end step 5, step 6 or step 7 3D scannings are carried out using Microfocus X-ray X ray CT；What step 5 was obtained is
CO2- salt solution equilibrium contact angle CT images；If core is hydrophilic, that step 6 is obtained is CO2- salt water receding contact angle CT images, step
Rapid 7 that obtain is CO2- salt solution advancing contact angle CT images；If core parent CO2, then that step 6 is obtained is CO2- salt solution advances and connects
Feeler CT images, that step 7 is obtained is CO2- salt water receding contact angle CT images；
Step 9. carries out dividing processing using computer to CT images, obtains the CO in core diverse location different aperture2- salt solution
Contact angle.
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Families Citing this family (9)
| 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 |
| 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 |
| CN107831179B (en) * | 2017-07-28 | 2023-06-23 | 中国石油化工股份有限公司 | Experimental device for utilize X ray projection method to survey rock surface oil-water contact angle |
| 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 |
| 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 |
| CN109085095B (en) * | 2018-08-08 | 2021-07-23 | 长安大学 | Soil contact angle testing device and method |
| CN109186500B (en) * | 2018-09-27 | 2020-03-31 | 西安交通大学 | Contact angle acquisition method for liquid-liquid two-phase displacement image in micron capillary |
| 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 |