CN109142162A - A kind of method of quick judgement polymer solution concentration and oil reservoir matching - Google Patents
A kind of method of quick judgement polymer solution concentration and oil reservoir matching Download PDFInfo
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- CN109142162A CN109142162A CN201811046321.XA CN201811046321A CN109142162A CN 109142162 A CN109142162 A CN 109142162A CN 201811046321 A CN201811046321 A CN 201811046321A CN 109142162 A CN109142162 A CN 109142162A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 118
- 238000000034 method Methods 0.000 title claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- 210000004492 nuclear pore Anatomy 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000012452 mother liquor Substances 0.000 claims description 11
- 150000001875 compounds Chemical class 0.000 claims description 2
- 239000000243 solution Substances 0.000 abstract description 63
- 238000002347 injection Methods 0.000 abstract description 11
- 239000007924 injection Substances 0.000 abstract description 11
- 238000002474 experimental method Methods 0.000 abstract description 6
- 239000003921 oil Substances 0.000 description 34
- 238000001914 filtration Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002975 chemoattractant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 210000000867 larynx Anatomy 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Classifications
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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
- G01N13/04—Investigating osmotic effects
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Filtration Of Liquid (AREA)
Abstract
The present invention relates to a kind of methods for quickly determining polymer solution concentration and oil reservoir matching.This method comprises: polymer and water are prepared a series of polymer solution of concentration from low to high, selection shouts the nuclear pore filter film that size matches with oil reservoir hole, measures filterable agent of each polymer solution by nuclear pore filter film；Determine that polymer solution can injection by the used time that the volume of nuclear pore filter film reaches 300mL according to filterable agent and polymer solution；And then the matched polymer solution concentration of size is shouted in determining and oil reservoir hole.This method can quickly determine the suitable polymer solution concentration of the polymer flooding of different blocks, reduce experimental period, simplify result judgement, so as to quickly provide experimental data for block pilot experiments.
Description
Technical field
The invention belongs to oilfield polymer flooding fields, and in particular to a kind of quickly to determine polymer solution concentration and oil reservoir
Method with property.
Background technique
Polymer flooding is the technology of the raising oil recovery factor an of comparative maturity, can expand swept volume, improve micro-
See oil displacement efficiency.Polymer flooding has had become the oil such as grand celebration, triumph, Henan since the 1990s enters field test
One of the major technique of recovery ratio is improved in field, and oil recovery factor 5%~12% can be improved on the basis of water drive.
In polymer flooding conceptual design, the selection of polyacrylamide (HPAM) molecular weight can be related to HPAM in aqueous solution
The size of molecular coil radius should shout size with the hole of oil reservoir and match, can just give full play to the effect of polymer flooding.At present
It can be screened by polymer molecular weight, the methods of injectability research and palliating degradation degree acquisition match with reservoir rocks physical property
Polymeric articles.
Polymer solution concentration will affect the degree of hydration of polymer in water, and then influence the big of HPAM hydrated molecule
It is small, if polymer solution concentration is excessive, it will cause HPAM hydrated molecule and flow through blocking when hole is shouted, cause the injection of polymer solution
Pressure increase and formation blockage, cause out liquid it is low, influence polymer flooding effect；If polymer solution concentration is too small, bring
Filtrational resistance is smaller, and the injection of polymer solution is caused to be failed.Currently, the remarkable lithogenesis of suitable concentration normal open of polymer solution
The heart, fill out sand tube rock core and the experiment of natural core injection and core oil-displacement test etc. determine, but the experimental period of these methods
Longer, result judgement is relatively complicated.
Summary of the invention
The purpose of the present invention is to provide a kind of methods for quickly determining polymer solution concentration and oil reservoir matching, thus
Solve the problems, such as that the period is long existing for existing method, result judgement is cumbersome.
To achieve the above object, the technical scheme adopted by the invention is that:
A kind of method of quick judgement polymer solution concentration and oil reservoir matching, comprising the following steps:
1) polymer and water are prepared into a series of polymer solution of concentration from low to high, selection shouts size phase with oil reservoir hole
Matched nuclear pore filter film measures filterable agent of each polymer solution by nuclear pore filter film；
2) such as filterable agent is not more than 2.0, and polymer solution reaches the used time of 300mL not by the volume of nuclear pore filter film
Greater than 8h, then determine that polymer solution can inject；It is determining to shout ruler with oil reservoir hole according to the concentration for each polymer solution that can be injected
Very little matched polymer solution concentration.
The method of quick judgement polymer solution concentration and oil reservoir matching provided by the invention, is combined by filterable agent
The filtrable volume of polymer solution reaches the used time of 300mL, determine polymer solution can injection, and then determination matched with oil reservoir
Polymer solution concentration.This method can quickly determine the suitable polymer solution concentration of the polymer flooding of different blocks, subtract
Simplify result judgement, so as to quickly provide experimental data for block pilot experiments small experimental period.
The concentration of polymer solution determines polymer hydration bulk of molecule, and concentration is bigger, and hydrated molecule is bigger, passes through
Being obstructed when nuclear pore filter film is bigger, and corresponding filterable agent is also bigger, and the filtrable volume of polymer solution reaches the used time of 300mL
It is longer, the filterable agent for the polymer solution that can be injected closer to 2.0 or used time closer to 8.0h, then the polymer solution
Concentration closer to can the implantation concentration upper limit.When to be further ensured that polymer solution injection, pressure steadily rises, and guarantees long-term
Injection is good, it is preferred that in step 2), in each polymer solution that can inject, selects polymerization of the filterable agent in 1.4-1.8
Object solution shouts the matched polymer solution of size as with oil reservoir hole.
According to bridge formation principle, it is its hydrated molecular coils that polymer molecule, which shouts the condition to be formed and stablize closure to oil reservoir hole,
Radius is greater than 0.46 times that radius mean value is shouted in intermediate value hole.Preferably to reflect that closure feature is shouted in oil reservoir hole, it is preferred that step 1)
In, the aperture radius of the nuclear pore filter film is 0.4-0.6 times that radius is shouted in oil reservoir intermediate value hole.The diameter of the nuclear pore filter film is
30-40mm.For better simulation oil layer deep migration pressure, it is preferred that pressure when measurement filterable agent is 0.2MPa.
From the simplicity for improving the preparation of series polymer solution, it is preferred that in step 1), the polymer solution
Concentration is 300-3000mg/L.It is first the poly- of 4000-5000mg/L by polymer and water compound concentration when prepared polymer solution
Object mother liquor is closed, polymer mother liquor is then diluted to a series of polymer solution of concentration from low to high.Such as it can be used
The method of stating obtain concentration be respectively 500mg/L, 800mg/L, 1000mg/L, 1500mg/L, 1800mg/L, 2000mg/L,
The polymer solution of 2500mg/L, 3000mg/L.It is stirred when prepared polymer mother liquor, the speed of stirring is 400-600r/
Min, mixing time 1-3h, when dilution, are stirred, and the speed of stirring is 200-300r/min, mixing time 20-
40min。
When prepared polymer solution, the salinity of water can also be impacted the linear and homogeneity of polymer molecule, into
And the measurement of filterable agent is influenced, in order to preferably reflect block polymer flooding characteristic, it is preferred that in step 1), the water is
Study the underground water of block.
The method of quick judgement polymer solution concentration and oil reservoir matching of the invention, can use existing multi-functional
Polymeric detection instrument carries out quickly screening to polymer solution concentration and determines, can facilitate detection polymer solution concentration and oil reservoir hole
It shouts and whether matches, supported to provide data for further embodiment design.
Detailed description of the invention
Fig. 1 be various concentration in embodiment 1 polymer solution by aperture be 3 μm nuclear pore filter film filtrable volume and when
Between relational graph；
Fig. 2 is the nuclear pore filter film that concentration is 2500mg/L in embodiment 2 polymer solution is 10 μm, 20 μm by aperture
Filtrable volume and time chart.
Specific embodiment
Embodiments of the present invention are described further combined with specific embodiments below.In following embodiment, polymer
Existing filterable agent tester may be selected in the test device of solution filterable agent, and it is CN2731450Y's that notification number, which can also be used,
The filterable agent automatic testing equipment of patent disclosure realizes the automatic detection of filterable agent.
Embodiment 1
VII 1-3 series of strata block oil area 9.15km of certain oil field2, oil in place 784.04 × 104T, reservoir temperature 93.7
DEG C, enter ultra-high water-containing development late stage at present.VII 2 series of strata of main layer, the reservoir properties of VII 3 series of strata are preferable at present, and stratum is former
Oil viscosity is 2.3mPas, oil density 0.753g/cm3, the plane and in-layer heterogeneity of reservoir be stronger.Pass through early period
The molecular weight screening test of polymer, selecting molecular weight is 23,560,000, and the flooding polymers (HPAM) that solid content is 89.26% are made
For the injection of polymer of polymer flooding.
The method of quick the judgement polymer solution concentration and oil reservoir matching of the present embodiment, using following steps:
1) polymer mother liquor for being 4500mg/L with polymer and double river ageing waste water concentration, then dirt is aged with rivers
Water by polymer mother liquor be diluted to concentration be respectively 500mg/L, 800mg/L, 1000mg/L, 1500mg/L, 1800mg/L,
The polymer solution of 2000mg/L, 2500mg/L, 3000mg/L, double river ageing sewage, rivers are aged the ion component of sewage such as
Shown in table 1.
The ion component of 1 block underground water of table
| Prepare water type | Na+、K+ | Ca2+ | Mg2+ | Cl- | SO4 2- | HCO3 - | TDS |
| Double rivers are aged sewage, mg/L | 1601 | 14 | 7.5 | 1172 | 391.5 | 1816 | 5002 |
| Rivers are aged sewage, mg/L | 2485 | 41 | 7 | 3114 | 1798 | 1285 | 8730 |
It is stirred when prepared polymer mother liquor, the speed of stirring is 500r/min, mixing time 2h, diluted polymer
It is stirred when mother liquor, the speed of stirring is 300r/min, mixing time 30min.
2) it is 3.68-4.49 μm that radius mean value is shouted in the oil reservoir intermediate value hole of the block, and selecting the aperture of nuclear pore filter film is 3 μm,
The diameter of nuclear pore filter film is 37mm, at 0.2 mpa determination step 1) filtering of the polymer solution of various concentration prepared because
Son, the filtration volume for recording polymer solution is the used time of 0-300mL, draws the filtration volume-time curve of polymer, as a result
As shown in Table 2 and Fig. 1.
Filterable agent, viscosity and the filtration time data of the different polymer solutions of table 2
By the result of table 2 and Fig. 1 it is found that with polymer solution concentration increase, filterable agent constantly increases, polymerizeing
When object solution concentration reaches 2500mg/L, size is shouted with the hole of oil reservoir and is matched.There are 10 mouthfuls of injection well in trial zone, producing well 16
Mouthful, pilot experiments conceptual design preposed attributives polymer solution concentration is 1600mg/L, injection rate 0.52PV, and injection is normal；
Design preposed attributives polymer solution concentration is 2500mg/L, and pressure steadily rises, polymer flooding significant effect.
Embodiment 2
Secrete 125 fault block oil area 1.3km in certain oil field2, oil in place 416 × 104T, V2-5 series of strata be area's reserves most
Straticulate exploration more, oil reservoir grade is best, oil area 1.12km2, oil in place 223 × 104T, underground crude oil viscosity
652.7mPa·s.V 2-5 series of strata capillary pressure curve calculated result shows: it is 2.81-34.24 μm that radius is shouted in intermediate value hole, average
It is 12.08 μm, substantially belongs to big porosity, senior middle school's osmosis type, throat distribution is relatively uniform, and gross porosity larynx is occupied an leading position,
Connectivity is good.
According to previous experiments, selects molecular weight for 35,390,000 polymer, then prepare polymerization according to the method for embodiment 1
Object mother liquor, and polymer mother liquor is diluted, obtaining concentration is respectively 500mg/L, 800mg/L, 1000mg/L, 1500mg/
L, the polymer solution of 1800mg/L, 2000mg/L, 2500mg/L, 3000mg/L.
It selects aperture for 10 μm and 20 μm of nuclear pore filter film respectively, detects the filterable agent of different polymer solutions, as a result
As shown in table 3.
The filterable agent and filtration time data of the different polymer solutions of table 3
In the case where polymer solution concentration is 2500mg/L, nucleopore aperture is crossed as 10 μm, the filtration of 20 μm of nuclear pore filter film
Amount and the relational graph of time are as shown in Fig. 2, as seen from the figure, concentration is that the polymer solution of 2500mg/L crosses 20 μm of nuclear pore filter films
When, filtrable volume is in a linear relationship with the time, illustrate that polymer water chemoattractant molecule can pass through filter membrane, when crossing 10 μm of nuclear pore filter films,
The used time that filtrable volume is 300mL is less than 8.0h, and filterable agent shows the filter that can be 10 μm by nucleopore aperture less than 1.5
Film.
On the basis of the above test data, it is 2500mg/L's that in trial zone, pilot experiments, which are passed through polymer solution concentration,
Preposed attributives, pressure steadily rise, polymer flooding significant effect.
Claims (6)
1. a kind of method for quickly determining polymer solution concentration and oil reservoir matching, which comprises the following steps:
1) polymer and water are prepared into a series of polymer solution of concentration from low to high, selection shouts size with oil reservoir hole and matches
Nuclear pore filter film, measure filterable agent of each polymer solution by nuclear pore filter film；
2) such as filterable agent is not more than 2.0, and polymer solution is not more than by the used time that the volume of nuclear pore filter film reaches 300mL
8h then determines that polymer solution can inject；It is determining to shout size with oil reservoir hole according to the concentration for each polymer solution that can be injected
The polymer solution concentration matched.
2. the method as described in claim 1 for quickly determining polymer solution concentration and oil reservoir matching, which is characterized in that step
It is rapid 2) in, in each polymer solution that can inject, select polymer solution of the filterable agent in 1.4-1.8 as with oil reservoir hole
Shout the matched polymer solution of size.
3. the method as described in claim 1 for quickly determining polymer solution concentration and oil reservoir matching, which is characterized in that institute
State 0.4-0.6 times that the aperture radius of nuclear pore filter film shouts radius for oil reservoir intermediate value hole.
4. the method for quick judgement polymer solution concentration and oil reservoir matching as claimed in any one of claims 1-3,
It is characterized in that, in step 1), the concentration of the polymer solution is 300-3000mg/L.
5. the method as claimed in claim 4 for quickly determining polymer solution concentration and oil reservoir matching, which is characterized in that match
When polymer solution processed, the polymer mother liquor for being first 4000-5000mg/L by polymer and water compound concentration, then by polymer
Mother liquor is diluted to a series of polymer solution of concentration from low to high.
6. the method as claimed in claim 4 for quickly determining polymer solution concentration and oil reservoir matching, which is characterized in that step
It is rapid 1) in, the water be study block underground water.
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Cited By (1)
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