CN110132797A - It is a kind of for measuring the experimental provision and method of chemical agent diffusion coefficient in rock core - Google Patents
It is a kind of for measuring the experimental provision and method of chemical agent diffusion coefficient in rock core Download PDFInfo
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- CN110132797A CN110132797A CN201910458487.0A CN201910458487A CN110132797A CN 110132797 A CN110132797 A CN 110132797A CN 201910458487 A CN201910458487 A CN 201910458487A CN 110132797 A CN110132797 A CN 110132797A
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- chemical agent
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N2013/003—Diffusion; diffusivity between liquids
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Abstract
The invention discloses a kind of for measuring the experimental provision and method of chemical agent diffusion coefficient in rock core, including constant speed and constant pressure pump, core holding unit, densimeter, backpressure pump and Liquid-containing；The Liquid-containing is connected between constant speed and constant pressure pump and core holding unit, is pumped by constant speed and constant pressure and the liquor in Liquid-containing is pumped into core holding unit；The backpressure pump is connected with core holding unit；The Liquid-containing is two containers connected side by side, is respectively provided with water and chemical agent；The core holding unit is equipped with sample tap, for acquiring diffusion liquor and detecting liquor density using densimeter.Device proposed by the present invention can directly obtain the concentration of chemical agent in porous media, and diffusion coefficient of the chemical agent in porous media can directly be calculated by matched method, it is more simpler than conventional method, this experiment invention simultaneously can also meet the experiment condition under high-temperature and high-pressure conditions, it is more in line with mining site reality, so that significantly more efficient instruct frscturing.
Description
Technical field
The present invention relates to petrochemical industries more particularly to a kind of for measuring the reality of chemical agent diffusion coefficient in rock core
Experiment device and method.
Background technique
Diffusion coefficient of the binary chemical agent in porous media is the important parameter for carrying out chemical flooding and improving recovery ratio research
One of, the diffusion of chemical agent will affect the concentration distribution of chemical agent in the earth formation, to influence the displacement of binary chemical agent oil removing
Effect.The diffusion coefficient of measurement solution is typically all and spreads in free medium, and porous media is due to porosity and hole at present
The complexity of gap structure is different from diffusion of the fluid in free medium, therefore accurate measurement binary chemical agent is in porous media
Effective diffusion cofficient be of great significance.
Summary of the invention
It is an object of the present invention in view of the above-mentioned problems, propose a kind of for measuring chemical agent diffusion coefficient in rock core
Experimental provision and method.
It is a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, including constant speed and constant pressure pump, rock core clamping
Device, densimeter, backpressure pump and Liquid-containing；The Liquid-containing is connected between constant speed and constant pressure pump and core holding unit, is passed through
Liquor in Liquid-containing is pumped into core holding unit by constant speed and constant pressure pump；The backpressure pump is connected with core holding unit, is used for
Apply pressure, real simulation underground rock core pressure condition to rock core；The Liquid-containing is two containers connected side by side, respectively
Equipped with water and chemical agent；The core holding unit is equipped with sample tap, for acquiring diffusion liquor and detecting liquid using densimeter
Agent density.
Further, a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, the rock core clamping
Device is also connected with confining pressure pump, for simulating mining site hyperbaric environment.
Further, a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, the rock core clamping
Device is placed in insulating box, for simulating mining site hot environment.
Further, a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, the Liquid-containing
Multiple valves are provided between constant speed and constant pressure pump, between Liquid-containing and core holding unit, for control water respectively and chemistry
The injection of agent.
It is a kind of for measuring the experimental method of chemical agent diffusion coefficient in rock core, include the following steps:
S1: the concentration and density curve of chemical agent sample to be measured is obtained；
S2: rock core saturation water flooding is injected in core holding unit, and calorstat temperature and confining pressure are set；
S3: opening the valve of the container equipped with water, injects water with constant injection rate, there are flowing out to exit, closes
Valve；
S4: opening the valve of the container equipped with chemical agent, starts timing, primary in sample tap sampling every the set time；
S5: sample rate is taken out in test, finds out sample concentration by concentration and density curve；
S6: sample concentration is brought into chemical solvent diffusion model:
Find out error functionValue, wherein C0For chemical agent original concentration；
S7: a is found by the error function table of comparisonsiValue, by derivation formula:
The diffusion coefficient D of chemical agent is acquired,
Wherein, l0Distance for sample tap apart from core entry end, V are chemical agent injection rate, tiFor sample time.
Beneficial effects of the present invention:
(1) easy to operate, a large amount of work for saving experimenter；
(2) sample size needed for testing every time is less, and precision is higher；
(3) each point of the experimental method can be taken in the hope of a diffusion coefficient and concentration by being averaged
End value, reduces systematic error and random error, and data reliability is bigger；
(4) device can be used for high temperature and high pressure environment, be more in line with mining site reality.
Detailed description of the invention
Fig. 1 is a kind of for measuring the experimental provision structural schematic diagram of chemical agent diffusion coefficient in rock core.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, this hair of Detailed description of the invention is now compareed
Bright specific embodiment.
In the present embodiment, as shown in Figure 1, it is a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, it wraps
Include constant speed and constant pressure pump, core holding unit, densimeter, backpressure pump and Liquid-containing；The Liquid-containing is connected to constant speed and constant pressure pump
Between core holding unit, is pumped by constant speed and constant pressure and the liquor in Liquid-containing is pumped into core holding unit；The backpressure pump
It is connected with core holding unit, for applying pressure, real simulation underground rock core pressure condition to rock core；The Liquid-containing is simultaneously
Two containers for arranging connection, are respectively provided with water and chemical agent；The core holding unit is equipped with sample tap, for acquiring diffusion liquid
Agent simultaneously detects liquor density using densimeter.
The core holding unit is connected with confining pressure pump, for simulating mining site hyperbaric environment.
The core holding unit is placed in insulating box, for simulating mining site hot environment.
Multiple valves are provided between the Liquid-containing and constant speed and constant pressure pump, between Liquid-containing and core holding unit
Door, for controlling the injection of water and chemical agent respectively.
In the present embodiment, it is saturated the rock core that fresh water and length are L, with constant speed V implantation concentration is the chemistry of C0 from arrival end
Agent solution can be described with following mathematical model:
In formula: when C (x, t)-moment t, the chemical agent concentration of core entry end x position；V indicates chemical agent injection rate；
X is the distance apart from core entry end.
Under the model, meet following equation:
C (x, 0)=0, x > 0；
C (x, 0)=C0, x < 0；
Acquire chemical solvent diffusion model:
Wherein erf (x) is error function.
Device through the invention, available t moment, x=l0Value C (the l of position0,ti):
Wherein, aiFor constant, it can be substituted into chemical solvent diffusion model, be found out by measured valueValue,
It can be found according to the error function table of comparisons, obtain diffusion coefficient D finally by above-mentioned derivation formula, wherein l0For sample tap distance
The distance at core entry end, V are chemical agent injection rate, tiFor sample time.
In the present embodiment, as shown in Figure 1, it is a kind of for measuring the experimental method of chemical agent diffusion coefficient in rock core, it walks
It is rapid as follows:
(1) sample to be tested concentration and density curve is established；
(2) rock core is saturated water flooding, be put into core holding unit, connected according to Fig. 1；
(3) calorstat temperature and confining pressure are set, valve 1,3 is opened, water is injected with constant injection rate, has water to exit
Valve 1,3 is closed in outflow；
(4) Open valve 2,4.Start timing, and takes a sample every the set time；
(5) sample rate is taken out in test, finds out sample concentration by concentration and density curve.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (5)
1. a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, which is characterized in that pumped including constant speed and constant pressure,
Core holding unit, densimeter, backpressure pump and Liquid-containing；The Liquid-containing be connected to constant speed and constant pressure pump with core holding unit it
Between, it is pumped by constant speed and constant pressure and the liquor in Liquid-containing is pumped into core holding unit；The backpressure pump and core holding unit phase
Even, for applying pressure, real simulation underground rock core pressure condition to rock core；The Liquid-containing is two appearances connected side by side
Device is respectively provided with water and chemical agent；The core holding unit is equipped with sample tap, for acquiring diffusion liquor and utilizing densimeter
Detect liquor density.
2. according to claim 1 a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, feature
It is, the core holding unit is also connected with confining pressure pump, for simulating mining site hyperbaric environment.
3. according to claim 1 a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, feature
It is, the core holding unit is placed in insulating box, for simulating mining site hot environment.
4. according to claim 1 a kind of for measuring the experimental provision of chemical agent diffusion coefficient in rock core, feature
It is, is provided with multiple valves between the Liquid-containing and constant speed and constant pressure pump, between Liquid-containing and core holding unit, uses
In the injection for controlling water and chemical agent respectively.
5. a kind of for measuring the experimental method of chemical agent diffusion coefficient in rock core, which comprises the steps of:
S1: the concentration and density curve of chemical agent sample to be measured is obtained；
S2: rock core saturation water flooding is injected in core holding unit, and calorstat temperature and confining pressure are set；
S3: opening the valve of the container equipped with water, injects water with constant injection rate, there are flowing out to exit, closes valve；
S4: opening the valve of the container equipped with chemical agent, starts timing, primary in sample tap sampling every the set time；
S5: sample rate is taken out in test, finds out sample concentration by concentration and density curve；
S6: sample concentration is brought into chemical solvent diffusion model:
Find out error functionValue, wherein C0For chemical agent original concentration；
S7: a is found by the error function table of comparisonsiValue, by derivation formula:
The diffusion coefficient D of chemical agent is acquired,
Wherein, l0Distance for sample tap apart from core entry end, V are chemical agent injection rate, tiFor sample time.
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| CN201910458487.0A CN110132797A (en) | 2019-05-29 | 2019-05-29 | It is a kind of for measuring the experimental provision and method of chemical agent diffusion coefficient in rock core |
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Cited By (1)
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| CN116678793A (en) * | 2023-07-27 | 2023-09-01 | 东北石油大学三亚海洋油气研究院 | Emulsion migration index and retention index measuring device and method |
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Application publication date: 20190816 |