CN105863587B - A kind of determination method of polymer flooding alternating injection timing - Google Patents
A kind of determination method of polymer flooding alternating injection timing Download PDFInfo
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- CN105863587B CN105863587B CN201610382195.XA CN201610382195A CN105863587B CN 105863587 B CN105863587 B CN 105863587B CN 201610382195 A CN201610382195 A CN 201610382195A CN 105863587 B CN105863587 B CN 105863587B
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- 229920000642 polymer Polymers 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000002347 injection Methods 0.000 title claims abstract description 19
- 239000007924 injection Substances 0.000 title claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 69
- 230000035699 permeability Effects 0.000 claims abstract description 27
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 26
- 230000008859 change Effects 0.000 claims abstract description 15
- 239000012530 fluid Substances 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001764 infiltration Methods 0.000 claims description 3
- 230000008595 infiltration Effects 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 2
- 238000011161 development Methods 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 34
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002068 genetic effect Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920002401 polyacrylamide Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials For Medical Uses (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of determination methods that polymer flooding replaces injection timing.This method is that the variation of the streaming rate in high permeability formation according to moisture content and oil displacement system determines alternately opportunity 1, alternately opportunity 2 and alternating opportunity 3；Alternately opportunity 1 is the period corresponding when production fluid moisture content reaches certain value；In the period of corresponding when alternately opportunity 2 is the streaming rate abrupt change in high permeability formation when oil displacement system；In the period of alternately opportunity 3 is corresponding when streaming rate of the oil displacement system in high permeability formation is in rising trend and tends towards stability.Alternately opportunity 1 changes viscosity of the viscosity more than the oil displacement system injected before of the new oil displacement system of note；Change the viscosity of the oil displacement system of note when alternately opportunity 2 changes the viscosity of the new oil displacement system of note less than alternately opportunity 1；Change the viscosity of the oil displacement system of note when alternately opportunity 3 changes the viscosity of the new oil displacement system of note less than alternately opportunity 2.The heterogeneous reservoir of implementation chemical flooding can be made to obtain different oil displacement efficiencies by the method for the invention, improve the development degree of low-permeability layer.
Description
Technical field
The present invention relates to a kind of determination methods that polymer flooding replaces injection timing, belong to oil development technical field.
Background technology
For the stronger oil reservoir of anisotropism, the injection mode meeting genetic profile reversion of single polymers slug makes infiltration
The relatively low reservoir of rate (calling low-permeability layer in the following text) residue Chuck Steak.Studies have shown that carrying out alternately note by different viscosities oil displacement system
The mode entered significantly improves the polymer displacement of reservoir oil of heterogeneous reservoir in the case of can be constant in polymer volume or even reduce
Effect improves the development degree of low-permeability layer.In order to determine alternate optimum efficiency, it is necessary to according to the viscosity of oil displacement system
And the physical property on stratum, select the shadow of the parameters such as suitable oil displacement system and its injection rate, slug length, injection timing
It rings.Only carry out in slug length, alternating frequency etc. although having carried out alternately injection research in state inland basin oil field
Research, but alternately the opportunity of injection has no document report.
Invention content
The object of the present invention is to provide a kind of determination method that polymer flooding replaces injection timing, methods through the invention
The heterogeneous reservoir of implementation chemical flooding can be made to obtain different oil displacement efficiencies, improve the development degree of low-permeability layer.
The determination method of polymer flooding alternating injection timing provided by the invention is according to moisture content and oil displacement system in height
The variation of streaming rate in infiltration layer determines alternately opportunity 1, alternately opportunity 2 and alternating opportunity 3；
The alternately opportunity 1 is the period corresponding when production fluid moisture content reaches certain value；
When the alternately opportunity 2 is corresponding when streaming rate abrupt change of the oil displacement system in the high permeability formation
Phase；
The alternately opportunity 3 is when streaming rate of the oil displacement system in the high permeability formation is in rising trend and tends towards stability
Corresponding period.
In above-mentioned determination method, the high permeability formation refers to the reservoir of permeability relatively high (compared with low-permeability layer).
In above-mentioned determination method, injected before the viscosity of the new oil displacement system that opportunity 1 changes note described alternately is more than
The oil displacement system viscosity；
Change the displacement of reservoir oil of note when the viscosity for the new oil displacement system that the alternately opportunity 2 changes note is less than alternately opportunity 1
The viscosity of system；
Change the displacement of reservoir oil of note when the viscosity for the new oil displacement system that the alternately opportunity 3 changes note is less than alternately opportunity 2
The viscosity of system.
The determining method specifically comprises the following steps：
(1) after injecting oil displacement system 1 into stratum, moisture content rises in production fluid, when moisture content rises to certain value, i.e.,
For alternately opportunity 1, change note oil displacement system 2 at this time, the viscosity of the oil displacement system 2 is higher than the viscosity of the oil displacement system 1；
(2) streaming rate of the oil displacement system 2 in the high permeability formation is in the variation risen after falling before, declines and rises
Turning point be alternately opportunity 2, change note oil displacement system 3 at this time, the viscosity of the oil displacement system 3 is less than the oil displacement system 2
Viscosity；
(3) streaming rate of the oil displacement system 3 in the high permeability formation rises, when ascendant trend tends towards stability, as
Alternately opportunity 3 changes note the oil displacement system 1 at this time；
(4) step (1)-(3) are repeated, until the displacement of reservoir oil is completed.
In above-mentioned determination method, the oil displacement system 1 is water；
The oil displacement system 2 and the oil displacement system 3 are the aqueous solutions of polymers of various concentration.
In above-mentioned determination method, in step (1), the definite value refers to the value between 40~100%.
In above-mentioned determination method, in step (2), the decline refers to the oil displacement system 2 with the turning point risen
In the period of streaming rate in the high permeability formation is corresponding when being 50%~100%.
In above-mentioned determination method, in step (3), the period that the ascendant trend tends towards stability refers to the displacement of reservoir oil body
When corresponding when to be 3 streaming rate in the high permeability formation be less than 10% with the streaming rate ratio amplitude of variation in low-permeability layer
Phase.
At polymer flooding initial stage, polymer more enters high permeability formation, and Adsorption And Retention wherein, leads to hypertonic laminar flow
Resistance increases, and is embodied on streaming rate (Fig. 1), is exactly the reduction of high permeability formation streaming rate, and low-permeability layer streaming rate rises, with hypertonic
Layer resistance increases, and polymer starts more to enter low-permeability layer, this process makes moderate progress to the fluid entry profile of heterogeneous reservoir.But
It is that after polymer constantly enters low-permeability layer, can equally generate flow resistance wherein, and the growth rate of resistance is faster, when
Hypotonic layer resistance increases to a certain degree, and more polymer can be again introduced into high permeability formation again, section reversion occurs, and polymer exists
It advances by leaps and bounds in high permeability formation, low-permeability layer development degree is low.In order to improve section reversion, low-permeability layer is enabled to a greater degree, in low-permeability layer
Streaming rate carries out alternately injection when reaching peak, can play significant improvement result.As shown in Fig. 2, after water drive, open
The polymer slug for the injection high concentration that begins, because its concentration is higher, the more single slug polymer of Adsorption And Retention ability is strong, generates resistance
Speed, when single polymers concentration slug injects before genetic profile reversion before hypotonic streaming rate minimum point, injection is low
Polymer can significantly improve fluid entry profile, and fluid entry profile becomes U-shaped by V-shape, and low-permeability layer can be tieed up in a longer period of time
Higher liquid absorption amount is held, the development degree of low-permeability layer is improved.
Description of the drawings
Fig. 1 is change curve of the single polymers concentration plug flow diverting rate with injection rate.
Fig. 2 is to carry out height dense polymer the alternating opportunity determined according to the method for the present invention alternately to inject streaming rate with injection
The change curve of amount.
Specific implementation mode
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
Single polymers concentration plug flow diverting rate with the variation of injection rate as shown in Figure 1, before carrying out polymer flooding, first
Water drive is carried out, changes polymer injection aqueous solution when moisture content reaches 40~100% in production fluid and carries out polymer flooding, change note
Opportunity is alternating opportunity 1；Streaming rate of the aqueous solutions of polymers in high permeability formation is in the V-shaped risen after falling before, is being declined
It is replace opportunity 2 with the opportunity corresponding to the turning point of rising, changes at alternately opportunity 2 and note viscosity small polymer than before
Aqueous solution；Streaming rate of the aqueous solutions of polymers in high permeability formation continues to rise, when high permeability formation streaming rate and low-permeability layer streaming rate ratio
It is alternating opportunity 3 to be worth when amplitude of variation is less than 10%, is changed to water drive at this time.
Using polyacrylamide SNF3640D, the alternating opportunity determined according to aforementioned present invention carries out the alternately displacement of reservoir oil, specifically
Steps are as follows：
It is filled with SNF3640D aqueous solutions in alternately opportunity 1 (in production fluid moisture content reach 80% corresponding in the period of)
(viscosity 34mPa.s), on alternately opportunity 2, (streaming rate of the SNF3640D aqueous solutions in high permeability formation is corresponding when being 60.5%
Period) when be filled with a kind of SNF3640D aqueous solutions (viscosity 10mPa.s), alternately (SNF3640D aqueous solutions exist opportunity 3
Shunting degree ratio amplitude of variation in streaming rate and low-permeability layer in high permeability formation period corresponding when being 4%) when inject water, pass through
In effect such as Fig. 2 after alternately injecting shown in " alternating " curve.As seen from Figure 2, it is alternately injected according to identified method
Afterwards, the liquid absorption amount of low-permeability layer is obviously higher than original (" not replacing " curve), i.e. the crude oil of low-permeability layer is gone out more by displacement, employs
Degree higher, the area for the closed figure that the degree of raising is surrounded by two curves.
Claims (1)
1. a kind of determination method of polymer flooding alternating injection timing, it is characterised in that：According to production fluid moisture content and displacement of reservoir oil body
The variation for tying up to the streaming rate in high permeability formation determines alternately opportunity 1, alternately opportunity 2 and alternating opportunity 3；
The alternately opportunity 1 is the period corresponding when production fluid moisture content reaches certain value；
In the period of the alternating opportunity 2 is corresponding when being the streaming rate abrupt change in the high permeability formation when oil displacement system；
The alternately opportunity 3 is right for when streaming rate of the oil displacement system in the high permeability formation is in rising trend and tends towards stability
The period answered；
The viscosity of the oil displacement system injected before the viscosity of the new oil displacement system that opportunity 1 changes note described alternately is more than；
Change the oil displacement system of note when the viscosity for the new oil displacement system that the alternately opportunity 2 changes note is less than alternately opportunity 1
Viscosity；
Change the oil displacement system of note when the viscosity for the new oil displacement system that the alternately opportunity 3 changes note is less than alternately opportunity 2
Viscosity；
The determining method specifically comprises the following steps：
（1）After injecting oil displacement system 1 into stratum, moisture content rises in production fluid, when moisture content rises to certain value, as hands over
For opportunity 1, change note oil displacement system 2 at this time, the viscosity of the oil displacement system 2 is higher than the viscosity of the oil displacement system 1；
The definite value refers to the value between 40 ~ 100%；
（2）Streaming rate of the oil displacement system 2 in the high permeability formation is in the variation risen after falling before, declines and turns with what is risen
Break is alternating opportunity 2, changes note oil displacement system 3 at this time, and the viscosity of the oil displacement system 3 is less than the viscous of the oil displacement system 2
Degree；
The decline refers to that streaming rate of the oil displacement system 2 in the high permeability formation is 50% ~ 100% with the turning point risen
When corresponding period in the range of；
（3）Streaming rate of the oil displacement system 3 in the high permeability formation rises, and when ascendant trend tends towards stability, as replaces
Opportunity 3 changes note the oil displacement system 1 at this time；
The period that the ascendant trend tends towards stability refer to streaming rate of the oil displacement system 3 in the high permeability formation with low
Streaming rate ratio amplitude of variation in infiltration layer is less than period corresponding when 10%；
（4）Repeat step（1）-（3）, until the displacement of reservoir oil is completed；
The oil displacement system 1 is water；
The oil displacement system 2 and the oil displacement system 3 are aqueous solutions of polymers, and the oil displacement system 2 and the displacement of reservoir oil body
It is the concentration difference of 3 aqueous solutions of polymers.
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107869340A (en) * | 2016-09-23 | 2018-04-03 | 中国石油化工股份有限公司 | The system of selection on thick oil well bore viscosity reduction opportunity |
| CN106703768B (en) * | 2016-11-29 | 2019-02-12 | 中国海洋石油集团有限公司 | A kind of determination method of simulation high-concentration and low-concentration polymer flooding alternating injection timing |
| CN111322054B (en) * | 2018-12-17 | 2022-11-04 | 中国石油天然气股份有限公司 | Three-three combined excavation and potential optimization mining method for sandstone oil reservoir in chemical flooding stage |
| CN109852362A (en) * | 2018-12-28 | 2019-06-07 | 中国海洋石油集团有限公司 | The double slug profile control agents and its method for implanting that heterogeneous reservoir predominant pathway controls after a kind of poly- drive |
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