CN104406980A - Visualization testing device and method for carbon dioxide (CO2)-water phase state in porous medium - Google Patents
Visualization testing device and method for carbon dioxide (CO2)-water phase state in porous medium Download PDFInfo
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Abstract
The invention discloses a visualization testing device and method for a carbon dioxide (CO2)-water phase state in a porous medium. The device mainly includes a camera, a sampling barrel, a water sample tank, a water sample tank saturated with CO2, and a pure CO2 gas sample tank. The method includes the following steps: the sample barrel is filled with silica sand to build a porous medium model; formation water with dissolved CO2 is stored in the sampling barrel under a constant pressure; the experimental temperature and the experimental pressure are maintained; the CO2 is partially dissolved in the water, and the coexistence of the CO2 and the water in the porous medium model is achieved, so as to form three phases (gas-liquid-liquid); exhaust and pressure relief or drainage and pressure relief is selected; the system pressure is recorded; the volume of exhausted gas or drained water is tested; the CO2-water phase state change in the sampling barrel in the pressure relief process is observed through an observation window; the CO2-water phase state change in the porous medium in a gas-water interface position and the like is studied. The invention has the advantages of reliable theory and high simplicity and convenience in operation, and can simulate CO2 geological storage in deep salt water reservoirs and abandoned gas reservoirs, as well as the development conditions of edge-bottom water gas reservoirs and water-soluble gas reservoirs, thereby achieving broad market prospects.
Description
Technical field
The present invention relates to carbon dioxide in porous medium-aqueous phase state visual testing device and method, belong to oil-gas field development and greenhouse gases CO
2geological storage and have the technical field that the exploitation of Gas Reservoirs and water soluble gas reservoir is relevant.
Background technology
Greenhouse gases CO
2geological storage be world research focus, deep brine layer and discarded gas reservoir are CO
2the important place of geological storage.Due to CO
2gas solubleness in water compares CH
4a high order of magnitude, and belong to supercritical fluid, therefore in geological storage process, CO
2phase Characteristics between-local water, CO when particularly porous medium exists
2-water dissolves each other with phase-state change for accurately calculating CO
2geological storage amount and simulation have vital effect.Meanwhile, a large amount of rock gas or CO that solve and dissolve in local water are needed in the exploitation of a large amount of edge-bottom water gas reservoir, particularly water soluble gas reservoir badly
2at gas reservoir development, the phase-state change in reservoir pressure reduction process and interaction, and the affecting laws to exploitation.Therefore CO in porous medium is studied
2-water phase-state change is to CO
2geological storage, edge-bottom water gas reservoir and water soluble gas reservoir exploitation significant.
At present, phase test both domestic and external is main only for the phase-state change of oil gas two-phase, and CO
2the phase-state change research of-water is less.Current test experimental provision used also cannot CO when effectively porous medium exists in Reality simulation stratum
2-aqueous phase state.Therefore, need to seek a kind of visual CO with porous medium environment
2the proving installation of-water phase-state change and method.
Summary of the invention
The object of the present invention is to provide carbon dioxide in porous medium-aqueous phase state visual testing device, this device effectively can simulate the truth of reservoir, also can realize CO
2visual and the shooting of-aqueous phase state change procedure, can be used for carrying out CO
2the PHYSICAL MODELING OF IN of the exploitation of the Geological storage in deep brine layer and discarded gas reservoir, edge-bottom water gas reservoir and water soluble gas reservoir.
Another object of the present invention is also to provide the method utilizing this device to carry out carbon dioxide in porous medium-aqueous phase state visual testing, and the method principle is reliable, easy and simple to handle, can simulate CO
2geological storage in the brine layer of deep and in discarded gas reservoir, and the development situation of edge-bottom water gas reservoir and water soluble gas reservoir, have wide market outlook.
For reaching above technical purpose, the invention provides following technical scheme.
Carbon dioxide in porous medium-aqueous phase state visual testing device, primarily of video camera, sample cylinder, water sample tank, saturated CO
2water sample tank, pure CO
2gas sample tank forms.Upper end cover is arranged at described sample cylinder top, and bottom end cover is arranged at bottom, and there is view window centre, and described upper end cover connects pure CO by top injection port
2gas sample tank, described bottom end cover had both been connected with tensimeter and thermometer, also connected water sample tank, saturated CO by bottom injection port
2water sample tank, described water sample tank, saturated CO
2water sample tank, pure CO
2gas sample tank is all connected with displacement pump.
Described sample cylinder is can the sample cylinder of filling silica sand, and sample cylinder two ends, can for pressurization, sample introduction and stock layout all with valve; The sapphire transparent windowpane of sample cylinder band high temperature high voltage resistant, CO in observable sample cylinder
2with volume change and the CO of water
2the change of-aqueous phase state; View window both sides are the rule of 1mm with precision, the CO in measurable sample cylinder
2with the volume of water.
CO in porous medium
2-aqueous phase state method of testing refers to: set up porous media model by the sample cylinder sand that rockfills, will be dissolved with CO
2local water be stored under a constant and be equipped with in the sample cylinder of silica sand, keep experimental temperature and pressure, CO
2be partially soluble in water and coexist in porous media model with water, formation solution-air-liquid three-phase, selects exhaust step-down or drainage and step-down, register system pressure, the tolerance of test discharge and the water yield, by CO in sample cylinder in view window observation pressure reduction
2the phase-state change of-water, CO in the research such as gas-water interface position porous medium
2the phase-state change of-water.
Utilize said apparatus to carry out the method for carbon dioxide in porous medium-aqueous phase state visual testing, comprise the following steps successively:
1) to filling silica sand in sample cylinder, set up porous media model, cover the upper end cover at top and the bottom end cover of bottom;
2) in sample cylinder, add stratum water sample, the sealing of testing fixture, increase pressure, ensure that the pressure in sample cylinder is not less than experimental pressure;
3) saturated CO is added from injection port bottom sample cylinder
2water sample, the stratum water sample in sample cylinder is all ejected, in this process, controls sample introduction speed and stock layout speed, ensure that the pressure in sample cylinder is not less than CO
2saturation pressure;
4) pure CO is added from sample cylinder top injection port
2gas sample, bottom sample cylinder, injection port discharges a part of water sample, and form the gas column height and the water colunm height that meet requirement of experiment, gas-water interface is in view window 2/3 place and is advisable;
5) select to carry out step-down from sample cylinder top vent or bottom discharge, by CO in sample cylinder in view window observation pressure reduction
2the change of-aqueous phase state, and use the whole experimentation of camera record.
The present invention utilizes to be filled with silica sand and with supercritical CO in the sample cylinder simulation actual formation porous medium of clear glass view window
2degassed and the phase-state change process of the mutual dissolving of-water, step-down.The volume of described sample cylinder is 1000ml, maximum pressure-bearing 70MPa, temperature 0-100 DEG C, with top and two, bottom injection port.By the top valve that is connected with bottom with sample cylinder top respectively and bottom valve, select from bottom discharge step-down or water filling boosting, or top vent step-down or gas injection boosting, CO in test different experiments process porous medium
2-water dissolves each other process and CO
2supecritical state changes.
Compared with prior art, the present invention has following beneficial effect:
(1) sample cylinder can filled stone sand, can carry out back-up sand according to different requirement of experiment, and simulation porous medium, therefore effectively can react the truth on stratum;
(2) at sample cylinder with visual view window, there is precision to be the rule of 1mm in view window both sides, the difference that can experimentally require during sample introduction, sample size can be monitored by view window and rule, control the sampling volume of the gentle sample of water sample, formation meets difference and requires water-gas distribution;
(3) different input modes and pattern type is selected by sample cylinder top and two, bottom injection port;
(4) top vent step-down and bottom discharge step-down two kinds of step-down modes are selected neatly according to different requirement of experiment;
(5) to observe by view window and video camera whole process and CO under recording different experiments pressure and temperature condition
2the phase-state change of-water, is rich in CO
2liquid phase, be rich in CO
2gas phase and the interphase change of aqueous phase, and the change of bubble in porous medium.By the out of phase volume change of scale quantitative description.
Accompanying drawing explanation
Fig. 1 is the structural representation of carbon dioxide in porous medium-aqueous phase state visual testing device.
In Fig. 1: 1. video camera; 2. pressure and temperature record sheet; 3. bottom end cover; 4. view window; 5. upper end cover; 6. top injection port; 7. injection port bottom; 8. water sample tank; 9. saturated CO
2water sample tank; 10. pure CO
2gas sample tank; 11. displacement pumps; 12. sample cylinders.
Embodiment
Further illustrate the present invention according to drawings and embodiments below.
Referring to Fig. 1.
Carbon dioxide in porous medium-aqueous phase state visual testing device, primarily of video camera 1, sample cylinder 12, pure water sample tank 8, saturated CO
2water sample tank 9, pure CO
2gas sample tank 10 forms, and upper end cover 5 is arranged at described sample cylinder 12 top, and bottom end cover 3 is arranged at bottom, and there is view window 4 centre, and described upper end cover 5 connects pure CO by top injection port 6
2gas sample tank 10, described bottom end cover 3 had both been connected with pressure and temperature record sheet 2, also connected water sample tank 8, saturated CO by bottom injection port 7
2water sample tank 9, described water sample tank 8, saturated CO
2water sample tank 9 and pure CO
2gas sample tank 10 connects displacement pump 11.
Utilize said apparatus to carry out carbon dioxide in porous medium-aqueous phase state visual testing, process is as follows: after sample cylinder cleans up, filling silica sand, builds gland bonnet and connects the pipeline be connected with injection port; In sample cylinder, add local water sample, and be forced into experimental pressure; CO will be dissolved with
2the local water water sample of gas pumps into from injection port bottom sample cylinder under experimental pressure, and discharges water sample from top injection port with certain speed; Under constant test pressure, pump into pure CO from sample cylinder top injection port
2gas, discharges a part of water sample from bottom injection port with constant speed; Select top vent or bottom discharge to carry out step-down, use cameras observe and record pressure reduction CO
2the phase-state change of-water.
Claims (2)
1. carbon dioxide in porous medium-aqueous phase state visual testing device, primarily of video camera (1), sample cylinder (12), pure water sample tank (8), saturated CO
2water sample tank (9), pure CO
2gas sample tank (10) forms, it is characterized in that, upper end cover (5) is arranged at described sample cylinder (12) top, bottom end cover (3) is arranged at bottom, there is view window (4) centre, and described upper end cover (5) connects pure CO by top injection port (6)
2gas sample tank (10), described bottom end cover (3) had both been connected with pressure and temperature record sheet (2), also connected water sample tank (8), saturated CO by bottom injection port (7)
2water sample tank (9), described water sample tank (8), saturated CO
2water sample tank (9) and pure CO
2gas sample tank (10) connects displacement pump (11).
2. utilize the device described in claim 1 to carry out the method for carbon dioxide in porous medium-aqueous phase state visual testing, comprise the following steps successively:
1) to filling silica sand in sample cylinder, set up porous media model, cover the upper end cover at top and the bottom end cover of bottom;
2) in sample cylinder, add stratum water sample, the sealing of testing fixture, increase pressure, ensure that the pressure in sample cylinder is not less than experimental pressure;
3) saturated CO is added from injection port bottom sample cylinder
2water sample, the stratum water sample in sample cylinder is all ejected, in this process, controls sample introduction speed and stock layout speed, ensure that the pressure in sample cylinder is not less than CO
2saturation pressure;
4) pure CO is added from sample cylinder top injection port
2gas sample, bottom sample cylinder, injection port discharges a part of water sample, and form the gas column height and the water colunm height that meet requirement of experiment, gas-water interface is in view window 2/3 place;
5) select to carry out step-down from sample cylinder top vent or bottom discharge, by CO in sample cylinder in view window observation pressure reduction
2the change of-aqueous phase state, and use the whole experimentation of camera record.
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Cited By (10)
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| CN105424729A (en) * | 2015-11-18 | 2016-03-23 | 西南石油大学 | CO2 saltwater layer sequestration experimental device and method |
| CN107290249A (en) * | 2016-04-11 | 2017-10-24 | 中国石油化工股份有限公司 | One kind observation supercritical CO2The method of-gas diffusion phenomenon |
| CN108444882A (en) * | 2018-01-17 | 2018-08-24 | 南方电网科学研究院有限责任公司 | A kind of experiment porch for measuring deep-well exhaust efficiency |
| CN109163880A (en) * | 2018-09-18 | 2019-01-08 | 天津大学 | A method of simulation carbon dioxide saturated solution is formed and bleeding process |
| CN110320341A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Fluid phase state test device and experimental method in porous media |
| CN111537549A (en) * | 2020-06-08 | 2020-08-14 | 北京大学 | Carbon dioxide flooding, storing and fracturing device with continuously-changed phase state and experimental method |
| CN112213236A (en) * | 2020-09-27 | 2021-01-12 | 西南石油大学 | Hydrate solid-state fluidization exploitation simulation high-pressure visual monitoring device |
| CN113049763A (en) * | 2021-03-08 | 2021-06-29 | 西南石油大学 | Experimental testing device and testing method for salt precipitation concentration of high-temperature high-pressure real formation water |
| CN113494979A (en) * | 2020-03-18 | 2021-10-12 | 扬州华宝石油仪器有限公司 | Fast mixed phase pressure measuring device |
| CN115749703A (en) * | 2022-10-18 | 2023-03-07 | 西南石油大学 | CO injection 2 Method for improving extraction degree of heterogeneous bottom water gas reservoir through huff and puff |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105424729A (en) * | 2015-11-18 | 2016-03-23 | 西南石油大学 | CO2 saltwater layer sequestration experimental device and method |
| CN107290249A (en) * | 2016-04-11 | 2017-10-24 | 中国石油化工股份有限公司 | One kind observation supercritical CO2The method of-gas diffusion phenomenon |
| CN108444882B (en) * | 2018-01-17 | 2021-04-16 | 南方电网科学研究院有限责任公司 | Experiment platform for measuring deep well exhaust efficiency |
| CN108444882A (en) * | 2018-01-17 | 2018-08-24 | 南方电网科学研究院有限责任公司 | A kind of experiment porch for measuring deep-well exhaust efficiency |
| CN110320341A (en) * | 2018-03-30 | 2019-10-11 | 中国石油化工股份有限公司 | Fluid phase state test device and experimental method in porous media |
| CN109163880A (en) * | 2018-09-18 | 2019-01-08 | 天津大学 | A method of simulation carbon dioxide saturated solution is formed and bleeding process |
| CN113494979A (en) * | 2020-03-18 | 2021-10-12 | 扬州华宝石油仪器有限公司 | Fast mixed phase pressure measuring device |
| CN113494979B (en) * | 2020-03-18 | 2024-02-09 | 扬州华宝石油仪器有限公司 | Mixed phase pressure quick measuring device |
| CN111537549A (en) * | 2020-06-08 | 2020-08-14 | 北京大学 | Carbon dioxide flooding, storing and fracturing device with continuously-changed phase state and experimental method |
| CN112213236A (en) * | 2020-09-27 | 2021-01-12 | 西南石油大学 | Hydrate solid-state fluidization exploitation simulation high-pressure visual monitoring device |
| CN113049763A (en) * | 2021-03-08 | 2021-06-29 | 西南石油大学 | Experimental testing device and testing method for salt precipitation concentration of high-temperature high-pressure real formation water |
| CN113049763B (en) * | 2021-03-08 | 2022-02-11 | 西南石油大学 | Experimental testing device and testing method for salt precipitation concentration of high-temperature high-pressure real formation water |
| CN115749703A (en) * | 2022-10-18 | 2023-03-07 | 西南石油大学 | CO injection 2 Method for improving extraction degree of heterogeneous bottom water gas reservoir through huff and puff |
| CN115749703B (en) * | 2022-10-18 | 2024-05-14 | 西南石油大学 | CO injection2Method for improving extraction degree of heterogeneous bottom water and gas reservoir through huff and puff |
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