CN108548835A - A method of evaluation foam dynamic stability during core flooding test - Google Patents

A method of evaluation foam dynamic stability during core flooding test Download PDF

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CN108548835A
CN108548835A CN201810131673.9A CN201810131673A CN108548835A CN 108548835 A CN108548835 A CN 108548835A CN 201810131673 A CN201810131673 A CN 201810131673A CN 108548835 A CN108548835 A CN 108548835A
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foam
core
gas
flooding
formula
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CN108548835B (en
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王文昌
狄勤丰
张景楠
华帅
陈锋
叶峰
李原
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University of Shanghai for Science and Technology
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    • G01N24/00—Investigating or analyzing materials by the use of nuclear magnetic resonance, electron paramagnetic resonance or other spin effects
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Abstract

The present invention relates to a kind of methods of evaluation foam dynamic stability during core flooding test, belong to foam flooding and improve recovery efficiency technique field.Foam flooding can significantly improve oil recovery factor, and the stability of foam is that can influence foam flooding technology widely applied key factor.The method of evaluation foam stability is mainly Static Assessment Method at present.Foam is a kind of continuous dynamic process for defoaming and constantly regenerating in practical oil displacement process, can not really reflect stability of the foam in oil displacement process using Static Assessment Method.The present invention is based on nuclear magnetic resonance techniques and the principle of mass conservation, establish the gas-liquid mass ratio relational expression of core entry end and outlet end, define the foam dynamic instability factor, the factor can evaluate dynamic stability of the foam in rock core when the displacement of reservoir oil, solve the problems, such as that dynamic stability can not be evaluated foam when the displacement of reservoir oil in rock core for a long time.

Description

A method of evaluation foam dynamic stability during core flooding test
Technical field
The present invention relates to a kind of methods of evaluation foam dynamic stability during core flooding test, belong to foam flooding raising Recovery efficiency technique field.
Background technology
Foam flooding can significantly improve oil recovery factor, and the stability of foam is that can influence foam flooding technology extensive use Key factor.Mainly have to the evaluation method of foam stability at present：
(1) Ross-Miles methods are improved：Improve the national standard method (GB/ that Ross-Miles methods are foaming properties detection T7462-94), this method is to configure certain density sample solution at a certain temperature, by 200mL sample solutions from height 900mm, internal diameter 2.9mm pore in flow down, pour in the 50mL sample solutions with mutually synthermal with concentration, write down and flowed Foaming power evaluation index of the foam height as detected sample when 200mL solution, 5min foam heights are steady as foam after blistering Qualitative evaluation index.
(2) succusion：This method is that foaming agent solution is packed into graduated cylinder, acutely vibrates 10s, remembers immediately after stopping oscillation Record generates the volume of foam as frothing capacity index, from stopping oscillation foam attenuation to the time that original half is highly desired Index as evaluation foam stability.
(3) paddling process (Waring-Blender methods)：Foaming agent solution 100mL to be measured is added into graduated cylinder, with constant speed Stop stirring after degree stirring 60s, the foam volume of generation is used to weigh the foamability of solution, foam attenuation to original volume one Half or the stability that the time needed for 50mL liquid is used to evaluate foam is precipitated.
Above method is mainly that the static method of foam stability is evaluated in the container of standing.Actual foam flooding Journey is happened at subsurface reservoir, and for reservoir as a kind of porous media, it is a kind of constantly defoaming and constantly regenerating that foam is migrated wherein At dynamic process.It cannot really reflect stability of the foam in reservoir using the Static Assessment Method for being detached from porous media.
Invention content
In view of the defects existing in the prior art, the present invention is based on nuclear magnetic resonance techniques and the principle of mass conservation, provide one kind Dynamic stability evaluation method of the foam in rock core in oil displacement process is evaluated, it is steady to solve foam dynamic in rock core for a long time Qualitative the problem of can not evaluating.
To achieve the above object, the present invention adopts the following technical scheme that：
A method of evaluation foam dynamic stability in oil displacement process is as follows：
1) core flooding test nuclear magnetic resonance experiment：
Rock core is first cleaned into drying before experiment, vacuumizes saturated water, then saturated oils and aging 48h, then carry out nuclear-magnetism Displacement test injects foam, ring pressure tracking 3MPa in a manner of constant current in experiment；Nuclear-magnetism T is carried out in displacement process2Spectrum test And weigh the quality of rock core before and after foam flooding；
2) gas-liquid volume ratio is converted with gas-liquid mass ratio：
The collected gas liquid ratio of laboratory experiment is generally gas-liquid volume ratio, needs to convert gas-liquid volume ratio to mass ratio：
Core entry end gas-liquid mass ratio nm,in：
Core entry end gas-liquid volume ratio nV,in：
In formula, mg,in、mw,inThe respectively quality of core entry end gas phase and water phase, g；Vg,in、Vw,inRespectively rock core enters The volume of mouth end gas phase and water phase, mL；
Gaseous state equilibrium equation substitution density formula is obtained：
In formula, ρg,inFor core entry end density of gas phase, g/ml；pinFor core entry end pressure, MPa；M is mole matter Amount, g/mol；R is gas constant, takes 8.314Jmol-1·K-1；TinFor core entry end temperature, K；
(2)~(3) formula substitution (1) formula is obtained：
3) calculate foam flooding during grease mass change amount
By to T2Spectrum water peak and oily peak are integrated, and the peak area corresponding to each peak, peak area and rock core are obtained The quality of interior corresponding fluid is in one-to-one relationship, obtains the mass change amount Δ m of oil during foam flooding accordinglyo With the mass change amount Δ m of waterw：
In formula, Aoi、AwiThe face that oily peak and water peak curve are surrounded with abscissa respectively under saturated oils and saturated-water phase Product, dimensionless；moi、mwiRock core oil-containing and aqueous quality, g respectively under saturated oils and saturated-water phase；mo,out、mw,outFor The quality of rock core outlet end oil phase and water phase, g；ΔAo、ΔAwRespectively peak area variable quantity, dimensionless；
4) foam dynamic stability is evaluated
According to the principle of mass conservation, fluid mass variable quantity, which is equal to, within a certain period of time, in cell cube flows into rock core and stream The fluid mass for going out rock core is poor, establishes the mass-conservation equation of foam flooding：
mw,in+mg,in-(mw,out+mg,out+mo,out)=Δ m (7)
In formula, mw,in、mg,inFor the quality of core entry end water phase and gas phase, g；mg,outFor the matter of rock core outlet end gas phase Amount,
g；Δ m is fluid mass variable quantity in cell cube, g, and the quality by weighing rock core before and after foam flooding obtains；
(4)~(6) formula substitution (7) formula is obtained：
Rock core internal foam gas liquid ratio is：
It enables：
Then：nm=nm,in+s (11)
Define Fs=| s | it is the dynamic instability factor, FsSmaller, the dynamic stability of foam is better；Work as FsWhen≤1, foam Stablize；Work as FsWhen≤2, foam weak steady；FsWhen ＞ 2, foam is unstable.
The core diameter is 25mm, and core porosity 10%~35%, permeability is 100mD~5000mD.
Foam slug length at least 1.0PV during foam flooding.
Compared with prior art, the present invention having the following advantages：
The method of the present invention more meets produce reality, and foam can not be evaluated for a long time by overcoming moves during rock core displacement The problem of state stability improves recovery efficiency technique preferred foams system for foam flooding and provides important method.
Description of the drawings
Fig. 1 is 1# rock core foam flooding nuclear magnetic resonance T2Spectrum.
Fig. 2 is 2# rock core foam flooding nuclear magnetic resonance T2Spectrum.
Specific implementation mode
After now the specific embodiment of present invention combination attached drawing is described in.
Foam system is evaluated first with Static Assessment Method (paddling process), the results are shown in Table 1.Two kinds of foam systems Foaming volume is not much different both known to static experiment, but stability has bigger difference.The half-life period of foam system 2 compares foams It is 1 high by 70%.
1 foam system performance static evaluation result of table
Sample Foaming volume/mL Half-life period/min
Foam system 1 230 340
Foam system 2 210 590
A kind of method of evaluation foam dynamic stability in oil displacement process of the present embodiment, is as follows：
A. core flooding test nuclear magnetic resonance experiment
The experiment parameter of core flooding test nuclear magnetic resonance experiment is as shown in table 2.
2 displacement test parameter of table
Diameter, length, permeability and the porosity of rock core are substantially the same.Rock core is first cleaned into drying before experiment, is taken out true Sky pressurization saturated water, then saturated oils and aging 48h, are then carried out nuclear-magnetism displacement test, are noted in a manner of constant current in experiment Enter foam, ring pressure tracking 3MPa.Nuclear-magnetism T is carried out in displacement process2Spectrum tests and weighs the quality of rock core before and after foam flooding, T2Spectrum Test result is as depicted in figs. 1 and 2, and the quality of rock core is as shown in table 3 before and after foam flooding.
3 foam dynamic instability factor calculating parameter of table
B. gas-liquid volume ratio is converted with mass ratio
The present embodiment is nitrogen, molal weight 28g/mol using gas；Isothermal seepage flow, temperature are 298.15K (25 DEG C), inlet pressure 1.5MPa, entrance gas-liquid volume ratio is 1, and the density of water is ρw,in=1.0g/m3, substitute into (12) formula obtain： nm,in=0.0165.
C. calculate foam flooding during grease mass change amount
The mass change amount Δ m of grease during foam flooding is calculated according to formula (5) and formula (6)oWith the mass change amount of water Δmw, the results are shown in Table 3.Oily Mass lost is 4.31g in 1# rock cores, and the quality of water increases 5.14g.Oily quality in 2# rock cores It is reduced to 4.54g, the quality of water increases 2.07g.
D. foam dynamic stability is evaluated
Foam dynamic instability sex factor F is calculated according to formula (8)s, and foam stability is evaluated, it the results are shown in Table 4.
4 foam dynamic stability of table is evaluated
The foam dynamic instability factor of foam system 1 is 0.61, and the foam dynamic instability factor of foam system 2 is 0.44, it is seen that the dynamic stability of foam system 2 is more than foam system 1.
By result above as can be seen that static stability evaluation method and dynamic evaluation method can evaluate foam The power of stability, but dynamic stability evaluation method is more realistic, more meets production using dynamic stability evaluation method It is practical.

Claims (3)

1. a kind of method of evaluation foam dynamic stability during core flooding test, which is characterized in that be as follows：
1) core flooding test nuclear magnetic resonance experiment：
Rock core is first cleaned into drying before experiment, vacuumizes saturated water, then saturated oils and aging, it is real then to carry out nuclear-magnetism displacement It tests, injects foam, ring pressure tracking in experiment in a manner of constant current；Nuclear-magnetism T is carried out in displacement process2Spectrum tests and weighs foam Drive the quality of front and back rock core；
2) gas-liquid volume ratio is converted with gas-liquid mass ratio：
The collected gas liquid ratio of laboratory experiment is generally gas-liquid volume ratio, needs to convert gas-liquid volume ratio to mass ratio：
Core entry end gas-liquid mass ratio nm,in：
Core entry end gas-liquid volume ratio nV,in：
In formula, mg,in、mw,inThe respectively quality of core entry end gas phase and water phase, g；Vg,in、Vw,inRespectively core entry end The volume of gas phase and water phase, mL；
Gaseous state equilibrium equation substitution density formula is obtained：
In formula, ρg,inFor core entry end density of gas phase, g/ml；pinFor core entry end pressure, MPa；M is molal weight, g/ mol；R is gas constant, takes 8.314Jmol-1·K-1；TinFor core entry end temperature, K；
(2)~(3) formula substitution (1) formula is obtained：
3) calculate foam flooding during grease mass change amount
By to T2Spectrum water peak and oily peak are integrated, and obtain the peak area corresponding to each peak, peak area in rock core therewith The quality of corresponding fluid is in one-to-one relationship, obtains the mass change amount Δ m of oil during foam flooding accordinglyoWith water Mass change amount Δ mw：
In formula, Aoi、AwiThe area that oily peak and water peak curve are surrounded with abscissa respectively under saturated oils and saturated-water phase, it is immeasurable Guiding principle；moi、mwiRock core oil-containing and aqueous quality, g respectively under saturated oils and saturated-water phase；mo,out、mw,outIt is exported for rock core Hold the quality of oil phase and water phase, g；ΔAo、ΔAwRespectively peak area variable quantity, dimensionless；
4) foam dynamic stability is evaluated
According to the principle of mass conservation, fluid mass variable quantity, which is equal to, within a certain period of time, in cell cube flows into rock core and outflow rock The fluid mass of the heart is poor, establishes the mass-conservation equation of foam flooding：
mw,in+mg,in-(mw,out+mg,out+mo,out)=Δ m (7)
In formula, mw,in、mg,inFor the quality of core entry end water phase and gas phase, g；mg,outFor the quality of rock core outlet end gas phase, g； Δ m is fluid mass variable quantity in cell cube, g, and the quality by weighing rock core before and after foam flooding obtains；
(4)~(6) formula substitution (7) formula is obtained：
Rock core internal foam gas liquid ratio is：
It enables：
Then：nm=nm,in+s (11)
Define Fs=| s | it is the dynamic instability factor, FsSmaller, the dynamic stability of foam is better；Work as FsWhen≤1, foam is steady It is fixed；Work as FsWhen≤2, foam weak steady；FsWhen ＞ 2, foam is unstable.
2. the method for evaluation foam dynamic stability in oil displacement process according to claim 1, which is characterized in that described Core diameter is 25mm, and core porosity 10%~35%, permeability is 100mD~5000mD.
3. the method for evaluation foam dynamic stability in oil displacement process according to claim 1, which is characterized in that foam Foam slug length at least 1.0PV during drive.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110398510A (en) * 2019-05-15 2019-11-01 上海大学 A kind of rock core oil/water scaling method based on nuclear magnetic resonance transverse relaxation spectral line
CN112505084A (en) * 2020-11-30 2021-03-16 中国石油大学(华东) Evaluation model, evaluation method and application for improving shale oil mobility through gas injection
CN113125645A (en) * 2021-04-12 2021-07-16 陕西延长石油（集团）有限责任公司 Novel method for representing comprehensive performance of foam system
CN117266805A (en) * 2023-08-03 2023-12-22 西南石油大学 Method for improving foam fluidity control capability in oil-containing environment based on foam quality optimization

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110398510A (en) * 2019-05-15 2019-11-01 上海大学 A kind of rock core oil/water scaling method based on nuclear magnetic resonance transverse relaxation spectral line
CN112505084A (en) * 2020-11-30 2021-03-16 中国石油大学(华东) Evaluation model, evaluation method and application for improving shale oil mobility through gas injection
CN112505084B (en) * 2020-11-30 2022-10-25 中国石油大学(华东) Evaluation model, evaluation method and application for improving shale oil mobility through gas injection
CN113125645A (en) * 2021-04-12 2021-07-16 陕西延长石油（集团）有限责任公司 Novel method for representing comprehensive performance of foam system
CN113125645B (en) * 2021-04-12 2023-09-05 陕西延长石油（集团）有限责任公司 Novel method for representing comprehensive performance of foam system
CN117266805A (en) * 2023-08-03 2023-12-22 西南石油大学 Method for improving foam fluidity control capability in oil-containing environment based on foam quality optimization
CN117266805B (en) * 2023-08-03 2024-03-19 西南石油大学 Method for improving foam fluidity control capability in oil-containing environment based on foam quality optimization

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