CN107687989A - Fast qualitative differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern - Google Patents
Fast qualitative differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern Download PDFInfo
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- CN107687989A CN107687989A CN201610634277.9A CN201610634277A CN107687989A CN 107687989 A CN107687989 A CN 107687989A CN 201610634277 A CN201610634277 A CN 201610634277A CN 107687989 A CN107687989 A CN 107687989A
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Abstract
The present invention provides a kind of fast qualitative and differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, and this method is carried out in a novel device for evaluation of filtration performance of flooding system, including：The viscoelastic particle oil displacement agent aqueous solution is put into container first, then pore throat radius is calculated according to permeability and the relational expression of pore throat radius, determine the size of stainless steel metal filter membrane, filter membrane is put into filter membrane clamper, starting device, filtrable volume changes over time situation when viscoelastic particle passes through filter screen at various pressures, makees filtration time filtration volume curve, migrational mode of the viscoelastic particle oil displacement agent when passing through formation pore throat is determined according to curve shape.This method is simple and quick, easily operated, can qualitatively judge the flow behavior of viscoelastic particle oil displacement agent, it is determined that under reservoir condition, is being the viscoelastic particle oil displacement agent PPG reliable technical basis of preferred offer.
Description
Technical field
The present invention relates to oil field development technical field, especially relates to a kind of fast qualitative and differentiates the viscoelastic particle displacement of reservoir oil
The method that agent passes through pore throat pattern.
Background technology
With the expansion of chemical flooding scale, preferable I, the II class reserves of reservoir condition are fewer and fewer, postpolymerflooded reservoirs
Exploitation with III, IV class harshness oil reservoir still lacks effective technological means, therefore, how to increase substantially postpolymerflooded reservoirs
And III, IV class oil reservoir recovery ratio turn into oilfield chemistry drive development urgent task.PPG(Preformed Particle
Gel it is) a kind of novel viscoelastic particle oil displacement agent with partial cross-linked part branched structure, using it as the heterogeneous multiple of host
It is a kind of new chemical flooding method of great filed application potentiality to close flooding method, advantageously accounts for oil reservoir raising after gathering drive and adopts
Yield problem.
The purpose of oil exploitation is that the crude oil for making underground flows out out of small duct of the subsurface rock, the viscoelastic particle displacement of reservoir oil
The problem of seepage flow of the agent PPG in blowhole is extremely important during tertiary oil recovery, understand viscoelastic particle oil displacement agent PPG
Flow behavior when passing through pore media helps to recognize heterogeneous combination flooding raising recovery mechanism.However, still lack at present
It is capable of the method for qualitative, quick analysis viscoelastic particle oil displacement agent seepage flow characteristics.Therefore, it is necessary to study qualitative judgement viscoplasticity
The method of particle oil displacement agent flow behavior when passing through pore throat, viscoelastic particle oil displacement agent flow behavior mathematical modulo is established for us
Type, the heterogeneous complex oil displacing mechanism of understanding provide foundation.
The importance of flow behavior, one kind has been invented for this when passing through pore media based on viscoelastic particle oil displacement agent PPG
New fast qualitative differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, solves above technical problem.
The content of the invention
It is an object of the invention to provide a kind of energy fast qualitative to differentiate viscoelastic particle oil displacement agent when passing through formation pore throat
The method of flow behavior.
The purpose of the present invention can be achieved by the following technical measures：Fast qualitative judges that the displacement of reservoir oil is driven with viscoelastic particle
The method of migrational mode when finish passes through formation pore throat, the fast qualitative differentiate that viscoelastic particle oil displacement agent passes through pore throat pattern
Method employs a kind of novel device for evaluation of filtration performance of flooding system, and the fast qualitative differentiates that viscoelastic particle oil displacement agent passes through
The method of pore throat pattern includes：Step 1, the viscoelastic particle oil displacement agent aqueous solution is put into filterability evaluation new device
In container；Step 2, pore throat radius is calculated according to permeability and the relational expression of pore throat radius, determines the hole of stainless steel metal filter membrane
Larynx size, filter membrane is put into the filter membrane clamper of filterability evaluation new device, it is new to start filterability evaluation
Device；Step 3, filtrable volume changes over time situation when research viscoelastic particle passes through filter screen at various pressures；Step 4, paint
Filtration time processed-filtration volume curve, the relation of curve shape and viscoelastic particle oil displacement agent migrational mode is established, according to curve
Shape determines migrational mode of the viscoelastic particle oil displacement agent when passing through formation pore throat.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, the viscoelastic particle oil displacement agent aqueous solution, concentration 2000mg/L are prepared using trial zone injection water.
In step 2, the calculating formula of pore throat diameter is：
D in formula：Pore throat diameter, μm；r：Pore throat radius, μm；K：Permeability, μm2；φ-porosity, %.
In step 3, when starting filterability evaluation new device, driving pressure is set, records and is glued under different pressures
Filtration volume and filtration time when elastic granule solution passes through filter membrane
In step 3, the setting range of driving pressure is 0-0.35MPa.
In step 4, filtration time-filtration volume curve is drawn, abscissa is filtration time, and ordinate is filtration body
Product, and is divided into three types according to curve shape, is reverse L type, anti-S types, linear, corresponds to viscoelastic particle oil displacement agent respectively and pass through
Three kinds of seepage states during pore throat：Based on closure, closure+deformation pass through, pass freely through based on.
Fast qualitative in the present invention differentiates method of the viscoelastic particle oil displacement agent by formation pore throat pattern, is related to surveying
Determine object migrational mode in by formation pore throat to judge, according to filtration curve shape and viscoelastic particle oil displacement agent migrational mode
The relation method that qualitatively judges displacement of reservoir oil viscoelastic particle oil displacement agent flow behavior when passing through formation pore throat, can quickly examine
The transport conditions of viscoelastic particle oil displacement agent in the earth formation are examined, can also be to the influence of matching relationship between PPG particles and pore throat
Factor is analyzed and researched, and reliable technical basis is provided to carry out the research of viscoelastic particle oil displacement agent PPG oil reservoir conformabilities.
Brief description of the drawings
The fast qualitative that Fig. 1 is the present invention judges migrational mode when displacement of reservoir oil viscoelastic particle oil displacement agent passes through formation pore throat
Method used in novel device for evaluation of filtration performance of flooding system structural representation；
The fast qualitative that Fig. 2 is the present invention judges migrational mode when displacement of reservoir oil viscoelastic particle oil displacement agent passes through formation pore throat
Method a specific embodiment flow chart；
The PPG that Fig. 3 is 150-200 μm, network structure thing content is 44.7% at various pressures by 25 μm of filter membranes when
Volume and filtration time relation curve are filtered, corresponding line style is reverse L type；
The PPG that Fig. 4 is 100-150 μm, network structure thing content is 44.7% at various pressures by 25 μm of filter membranes when
Volume and filtration time relation curve are filtered, corresponding line style is anti-S types；
The PPG that Fig. 5 is 60-100 μm, network structure thing content is 44.7% is under 0.007MPa by being filtered during 25 μm of filter membranes
Volume and filtration time relation curve are crossed, corresponding line style is linear；
Fig. 6 is 60-100 μm, network structure thing content is 57.2%PPG at various pressures by being filtered during 25 μm of filter membranes
Volume and filtration time relation curve, corresponding line style is anti-S types.
Embodiment
To enable the above and other objects, features and advantages of the present invention to become apparent, especially exemplified by going out preferred embodiment, and
Coordinate institute's accompanying drawings, be described in detail below.
As shown in figure 1, the fast qualitative that Fig. 1 is the present invention judges that displacement of reservoir oil viscoelastic particle oil displacement agent passes through formation pore throat
When migrational mode method used in novel device for evaluation of filtration performance of flooding system structural representation.
Novel device for evaluation of filtration performance of flooding system is specific to specific Chemical Flooding Fluids and polymer suspension
The systems such as liquid carry out the special type equipment of filterability evaluation, can accurately reflect pair of particle and pore throat under different pressures, flow velocity
It should be related to, flow behavior of the evaluation heterogeneous system when passing through pore throat.
Novel device for evaluation of filtration performance of flooding system mainly includes air compressor 1, container 2, filter membrane clamper 3, again
Measure flowmeter 4, sample accumulator tank 5 and data collecting system 6.Air compressor 1 is placed in the rear hood of device, there is provided container 2
Seal pressure, container 2 is connected with filter membrane clamper 3, and sample accumulator tank 5 is placed on weight flow meter 4, weight flow meter 4 with
Data collecting system 6 connects.
As shown in Fig. 2 Fig. 2 is differentiation flow chart of the viscoelastic particle oil displacement agent by the method for pore throat pattern.
In step 101, the aqueous solution for the viscoelastic particle oil displacement agent PPG for being configured to certain density different-grain diameter is placed in
In the container of novel device for evaluation of filtration performance of flooding system.In one embodiment, viscoplasticity is prepared using trial zone injection water
The particle oil displacement agent aqueous solution, concentration 2000mg/L.Flow enters step 102.
In step 102, the stainless steel filtering net of certain pore throat size is selected, is installed in the evaluation of oil displacement system filterability
In the container closure part of new device.In one embodiment, it is straight according to permeability and the relational expression of pore throat radius (1) calculating pore throat
Footpath d, determine the size of stainless steel metal filter membrane.R in formula：Pore throat radius, μm；K：Permeability, 10-3μm2；φ-porosity, %.
Flow enters step 103.
In step 103, start novel device for evaluation of filtration performance of flooding system, set driving pressure, record different pressures
Filtration volume and filtration time when lower PPG solution passes through filter membrane.In one embodiment, the setting range of driving pressure is 0-
0.35MPa.Flow enters step 104.
In step 104, filtration curve is drawn, establishes the relation of curve shape and viscoelastic particle oil displacement agent migrational mode,
Migrational mode of the viscoelastic particle oil displacement agent when passing through formation pore throat is determined according to curve shape.In one embodiment, it is bent
Line abscissa is filtration time, and ordinate is filtration volume, and is divided into three types according to curve shape, is respectively passed freely through
Based on, closure+deformation pass through, block based on.Flow terminates.
In the specific testing example 1 of the application present invention：
This method comprises the following steps：
A. the viscoelastic particle oil displacement agent PPG that be 150-200 μm by particle mesh number, network structure thing content is 44.7% is used
Water compound concentration is the 2000mg/L aqueous solution；
B. solution is placed in the container of novel device for evaluation of filtration performance of flooding system；
C. according to the relational expression (1) of permeability and pore throat diameter, select 25 μm close to the average pore throat diameter in stratum it is stainless
Steel metal filter membrane simulation permeability is 5000 × 10-3μm2Formation pore throat, it is new to be installed in the evaluation of oil displacement system filterability
On the filter membrane clamper of type device；
D. start novel device for evaluation of filtration performance of flooding system, increase continuously driving pressure be respectively 0.007MPa,
0.01MPa、0.03MPa、0.05MPa、0.07MPa、0.09MPa、0.11MPa、0.13MPa、0.15MPa、0.17MPa、
0.2MPa, 0.25MPa, filtration volume and filtration time when PPG solution passes through filter membrane are recorded at various pressures；
E. filtration curve is drawn, the relation with viscoelastic particle oil displacement agent migrational mode is determined according to curve shape.
Testing example 2：
With particle mesh number it is 100-150 μm in step a, the viscoelastic particle oil displacement agent that network structure thing content is 44.7%
It is 150-200 μm of viscoelastic particle oil displacement agent PPG that PPG, which replaces particle mesh number, driving pressure be arranged to 0.007MPa,
0.01MPa、0.03MPa、0.05MPa、0.07MPa、0.09MPa、0.11MPa、0.15MPa、0.2MPa、0.25MPa、
0.27MPa, other are the same as testing example 1.
Testing example 3：
With particle mesh number it is 60-100 μm in step a, the viscoelastic particle oil displacement agent that network structure thing content is 44.7%
PPG replaces the viscoelastic particle oil displacement agent PPG that particle mesh number is 150-200 μm, and driving pressure is arranged to 0.007MPa, and other are same
Testing example 1.
Testing example 1 to the measured result of embodiment 3 respectively obtains three kinds of curve shapes, respectively reverse L type, anti-S types, line
Property, see Fig. 3, Fig. 4, Fig. 5.As seen from the figure, three kinds of curve shapes show respectively what PPG was shown when passing through pore throat
Three kinds of migration states：The accumulated plugging at pore throat, causes pore throat to block completely；" closure+deformation passes through " occurs at pore throat；From
By passing through pore throat.
Testing example 4：
With particle mesh number it is 60-100 μm in step a, the viscoelastic particle oil displacement agent that network structure thing content is 57.2%
The aqueous solution that PPG is 2000mg/L with water compound concentration；Other are the same as testing example 1.It can be seen from the results that curve shape is
Anti- S types, show that the PPG samples are passed through at pore throat with the pattern of " closure-deformation passes through ".
By many experiments as can be seen that the present invention can judge migrational modes of the PPG when passing through pore throat with fast qualitative,
And available for the influence factor of matching relationship between analysis and research PPG particles and pore throat.
Claims (6)
1. fast qualitative differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, it is characterised in that the fast qualitative is sentenced
Other viscoelastic particle oil displacement agent employs a kind of novel device for evaluation of filtration performance of flooding system by the method for pore throat pattern, should
Fast qualitative differentiates that viscoelastic particle oil displacement agent is included by the method for pore throat pattern：
Step 1, the viscoelastic particle oil displacement agent aqueous solution is put into the container of the novel device for evaluation of filtration performance of flooding system；
Step 2, pore throat radius is calculated according to permeability and the relational expression of pore throat radius, determines the pore throat chi of stainless steel metal filter membrane
It is very little, filter membrane is put into the filter membrane clamper of the novel device for evaluation of filtration performance of flooding system；
Step 3, the novel device for evaluation of filtration performance of flooding system is started, research viscoelastic particle passes through filter at various pressures
Filtrable volume changes over time situation during net；
Step 4, filtration time-filtration volume curve is drawn, establishes curve shape and viscoelastic particle oil displacement agent migrational mode
Relation, migrational mode of the viscoelastic particle oil displacement agent when passing through formation pore throat is determined according to curve shape.
2. fast qualitative according to claim 1 differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, it is special
Sign is, in step 1, the viscoelastic particle oil displacement agent aqueous solution, concentration 2000mg/L is prepared using trial zone injection water.
3. fast qualitative according to claim 1 differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, it is special
Sign is that in step 2, the calculating formula of pore throat diameter is：
D in formula：Pore throat diameter, μm；r：Pore throat radius, μm；K：Permeability, μm2；φ-porosity, %.
4. fast qualitative according to claim 1 differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, it is special
Sign is, in step 3, when starting the novel device for evaluation of filtration performance of flooding system, sets driving pressure, records different pressures
Filtration volume and filtration time when viscoelastic particle solution passes through filter membrane under power.
5. fast qualitative according to claim 4 differentiates method of the viscoelastic particle oil displacement agent by pore throat pattern, it is special
Sign is that in step 3, the setting range of driving pressure is 0-0.35MPa.
6. differentiate method of the viscoelastic particle oil displacement agent by pore throat pattern, its feature according to the fast qualitative described in claim 1
It is, in step 4, draw filtration time-filtration volume curve, abscissa is filtration time, and ordinate is filtration volume, and
Three types are divided into according to curve shape, is reverse L type, anti-S types, linear, corresponds to viscoelastic particle oil displacement agent respectively and pass through pore throat
When three kinds of seepage states：Based on closure, closure+deformation pass through, pass freely through based on.
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Cited By (4)
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| CN109738303A (en) * | 2019-01-18 | 2019-05-10 | 中国石油化工股份有限公司 | Viscoelastic particle repeatedly shears particle size test macro and test method after filtering |
| CN109992836A (en) * | 2019-03-05 | 2019-07-09 | 中国石油化工股份有限公司 | Adapt to the viscoelastic particle oil displacement agent high efficiency selected method of different oil reservoir demands |
| CN112557634A (en) * | 2021-01-05 | 2021-03-26 | 中国石油化工股份有限公司 | Method for evaluating diesel oil performance and application |
| CN113628690A (en) * | 2021-08-11 | 2021-11-09 | 西南石油大学 | Oil displacement binary composite system formula optimization method based on pore throat radius adaptability |
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Cited By (6)
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|---|---|---|---|---|
| CN109738303A (en) * | 2019-01-18 | 2019-05-10 | 中国石油化工股份有限公司 | Viscoelastic particle repeatedly shears particle size test macro and test method after filtering |
| CN109992836A (en) * | 2019-03-05 | 2019-07-09 | 中国石油化工股份有限公司 | Adapt to the viscoelastic particle oil displacement agent high efficiency selected method of different oil reservoir demands |
| CN109992836B (en) * | 2019-03-05 | 2021-09-28 | 中国石油化工股份有限公司 | Efficient selection method of viscoelastic particle oil displacement agent suitable for different oil reservoir requirements |
| CN112557634A (en) * | 2021-01-05 | 2021-03-26 | 中国石油化工股份有限公司 | Method for evaluating diesel oil performance and application |
| CN113628690A (en) * | 2021-08-11 | 2021-11-09 | 西南石油大学 | Oil displacement binary composite system formula optimization method based on pore throat radius adaptability |
| CN113628690B (en) * | 2021-08-11 | 2023-07-25 | 西南石油大学 | Binary composite system formula optimization method for oil displacement based on pore-throat radius suitability |
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