CN107503721B - A method of being effectively improved hypertonic high water-cut reservoir polymer flooding effect - Google Patents
A method of being effectively improved hypertonic high water-cut reservoir polymer flooding effect Download PDFInfo
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- CN107503721B CN107503721B CN201710712672.9A CN201710712672A CN107503721B CN 107503721 B CN107503721 B CN 107503721B CN 201710712672 A CN201710712672 A CN 201710712672A CN 107503721 B CN107503721 B CN 107503721B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
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- Environmental & Geological Engineering (AREA)
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- General Life Sciences & Earth Sciences (AREA)
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Abstract
The present invention discloses a kind of method for being effectively improved hypertonic high water-cut reservoir polymer flooding effect, comprising the following steps: determines reservoir condition；According to reservoir condition, corresponding core model is established, and establishes the experiment porch of simulation oil reservoir oil displacement production；Measure the apparent viscosity of polymer；Carry out resistance coefficient and residual resistance factor of the seepage flow characteristics experimental analysis polymer in porous media；Calculate the recovery ratio increase rate of polymer solution；Establish the correlation figure of solution viscosity, residual resistance factor and recovery ratio increase rate；Analyze the wherein influence relationship of apparent viscosity, residual resistance factor to recovery ratio increase rate；The influence size of apparent viscosity, residual resistance factor to recovery ratio increase rate is judged, so that it is determined that out to the performance requirement of polymeric system under the conditions of oil reservoir.Application of the present invention enhances adaptability of the polymer solution in oil reservoir.
Description
Technical field
The invention belongs to Petroleum Processing Technology fields, are related to one kind and are effectively improved hypertonic high water-cut reservoir polymer flooding effect
Method.
Background technique
In China's oil reservoir secondary development, 90% or more the waterflooding extraction used, long-term flooding production makes porous in stratum
Rock particles in medium generates migration, further increases the non-homogeneous degree of oil reservoir, forms strong current channel, sternly
Affect following injected water again involves ability.Therefore, oil reservoir late high water content period all can be using modified water driving technology come further
Improve sweep efficiency and oil displacement efficiency.
The oil reservoir that permeability is high, heterogeneity is serious, Crude viscosity is high, after waterflooding extraction after high water-cut stage, to poly-
Closing object drive, further improvement oil recovery increase rate brings huge problem.Firstly, polymer solution is in process of injection allocation,
Dissolution vulnerable to dissolving tank is bad and too strong objective influence is sheared near wellbore zone, and Properties of Copolymer Solution is by huge shadow
It rings；Secondly, the mainstream channel of formation forces injection of polymer to be difficult to form effective flow resistance compared with high-moisture percentage, thus into
The effective profile control control of row.
Now currently, both of these problems are the main bugbears that annoying polymer flooding always and further increase recovery ratio.Therefore,
It is badly in need of a kind of method to improve the polymer recovery ratio increase rate of hypertonic high water-cut reservoir.
Summary of the invention
The present invention is mainly to propose that a kind of enhancing polymer solution adaptability in oil reservoir is effectively improved hypertonic High water cut
The method of reservoir polymer drive effect.
Gather the technical scheme of the invention to solve the technical problem is: one kind is effectively improved hypertonic high water-cut reservoir
Close the method that object drives effect, comprising the following steps:
Step 1 determines reservoir condition；
Step 2, according to reservoir condition, establish corresponding core model, and the experiment for establishing simulation oil reservoir oil displacement production is flat
Platform；
Step 3 selects multiple polymeric systems, and is configured to certain density polymer solution, measures each polymer
The apparent viscosity of solution；Its concentration range is 1400-1750mg/L；
Step 4, with the core model under reservoir condition in step 2, the polymer solution being configured in step 3 is seeped
Characterization experiments are flowed, resistance coefficient and residual resistance factor of each polymer solution in porous media are measured；Wherein at 1 milliliter
Seepage flow characteristics experiment is carried out under speed per minute；
Step 5 carries out oil displacement experiment to each polymer solution, and the recovery ratio for obtaining each polymer solution improves width
Degree；
Step 6, each polymer solution according to obtained in step 3- step 5 apparent viscosity, residual resistance factor, adopt
Yield increase rate establishes the correlation figure between apparent viscosity, residual resistance factor and recovery ratio increase rate three；
The data that recovery ratio increase rate is 5 percent or more in correlation figure in step 7, selecting step 6, and point
Analyse the wherein influence relationship of apparent viscosity, residual resistance factor to recovery ratio increase rate；
Step 8 judges the influence size of apparent viscosity, residual resistance factor to recovery ratio increase rate, so that it is determined that going out
To the performance requirement of polymeric system under reservoir condition, corresponding polymeric system is established finally by synthesis.
Further, reservoir condition includes the Crude viscosity of oil reservoir, the porosity of oil reservoir, permeability in the step 1
Parameter, the temperature condition of oil reservoir, oil reservoir non-homogeneous degree, oil reservoir clay mineral content.
Further, according to apparent viscosity, residual resistance factor, recovery ratio increase rate multiple groups number in the step 6
According to, by matlab platform using grey correlation methods calculate three's degree of association, obtain the correlation figure of three.
Further, when the influence power of apparent viscosity is greater than residual resistance factor, then polymeric system in the step 8
Performance be low residual resistance factor, high viscosity；When the influence power of apparent viscosity is less than residual resistance factor, then polymeric system
Performance be high residual resistance factor, low-viscosity；When the influence power of apparent viscosity is equal to residual resistance factor, then polymeric system
Performance be high residual resistance factor, low-viscosity or low residual resistance factor, low-viscosity.
The invention has the benefit that the present invention can determine polymer recovery ratio increase rate under different reservoir conditions,
Influence relationship of the Properties of Copolymer Solution factor (apparent viscosity and residual resistance factor) to recovery ratio increase rate is established, thus
Determine the performance requirement under reservoir condition to polymeric system；Corresponding system is established finally by synthesis.Such method is answered
With enhancing adaptability of the polymer solution in oil reservoir.
Detailed description of the invention
Fig. 1 is the correlation figure of residual resistance factor in embodiment, apparent viscosity and recovery ratio increase rate；
Fig. 2 is injection pressure tracing analysis figure in embodiment；
Fig. 3 is the viscosity loss rate in embodiment under the conditions of various concentration.
Specific embodiment
Technical scheme of the present invention will be further explained in detail by way of example and in conjunction with the accompanying drawings.
A kind of method being effectively improved hypertonic high water-cut reservoir polymer flooding effect of the invention, comprising the following steps:
Step 1 determines the Crude viscosity of reservoir condition in 25mPas, and Reservoir Heterogeneity is serious, and temperature is on 65 DEG C of left sides
The right side, permeability is in 2000mD or so, and porosity is 30% or so；By long-term production development, oil reservoir overall moisture content reaches
80%-90%, it is more not employ block, basically forms water drive fluid-channeling channel.Clay mineral content is 5% or so, mainly with green
Based on mudstone, illite etc.；
Step 2, according to above-mentioned reservoir condition, establish corresponding core model, and establish simulation oil reservoir oil displacement production reality
Test platform；
Step 3, the mixing for selecting polyacrylamide, hydrophobic associated polymer and polyacrylamide, hydrophobic associated polymer
Object, and it is configured to the polyacrylamide solution of 1750mg/L, the hydrophobic association polymer solution of 1500mg/L, 1400mg/L respectively
Mixture solution, and respectively measure three apparent viscosity, be shown in Table 1；
Step 4, with the core model under reservoir condition in step 2, to above three under 1 milliliter of speed per minute
Solution carries out seepage flow characteristics experiment, respectively obtains resistance coefficient and residual resistance factor of the above-mentioned solution in porous media, such as
Table 1；
Apparent viscosity, resistance coefficient and the residual resistance factor of 1 polymeric system of table
Step 5 carries out oil displacement experiment to above three polymer solution, and the recovery ratio for obtaining each polymer solution improves
Amplitude, such as table 2；
The recovery ratio increase rate of 2 polymer solution of table
Step 6, according to each data in Tables 1 and 2, calculate three using grey correlation methods by matlab platform
The degree of association establishes the correlation figure between apparent viscosity, residual resistance factor and recovery ratio increase rate three, such as Fig. 1 institute
Show；
The data of 5 percent or more recovery ratio increase rates, table are improved in step 7, selecting step 6 in correlation figure
See the influence relationship of viscosity, residual resistance factor to recovery ratio increase rate；
Step 8 may determine that shadow of the residual resistance factor than apparent viscosity to recovery ratio increase rate from the data in Fig. 1
Sound is bigger；And in view of Polymer Solution Viscosity is higher, injection problem is more serious (see Fig. 2), and the shearing of near wellbore zone
Effect to caused by polymer stick damage usually in 30%-70%, viscosity is higher, caused by viscosity loss value it is bigger, porous
Viscosity is lower (see Fig. 3) in medium, therefore, for hypertonic, high water-cut reservoir Polymer Flooding, it should be to establish high remaining resistance
The polymeric system of force coefficient, low-viscosity.
The above is not intended to limit the present invention in any form, although the present invention is disclosed such as by embodiment
On, however, it is not intended to limit the invention, any person skilled in the art, is not departing from technical solution of the present invention range
It is interior, when the technology contents using the disclosure above make a little change or are modified to the equivalent embodiment of equivalent variations, but it is all
It is to the above embodiments according to the technical essence of the invention any simply to repair without departing from the content of technical solution of the present invention
Change, equivalent variations and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (3)
1. a kind of method for being effectively improved hypertonic high water-cut reservoir polymer flooding effect, which comprises the following steps:
Step 1 determines reservoir condition；
Step 2, according to reservoir condition, establish corresponding core model, and establish simulation oil reservoir oil displacement production experiment porch；
Step 3 selects multiple polymeric systems, and is configured to certain density polymer solution, measures each polymer solution
Apparent viscosity；
Step 4, with the core model under reservoir condition in step 2, it is special that seepage flow is carried out to the polymer solution being configured in step 3
Levies in kind is tested, and resistance coefficient and residual resistance factor of each polymer solution in porous media are measured；
Step 5 carries out oil displacement experiment to each polymer solution, obtains the recovery ratio increase rate of each polymer solution；
Step 6, the apparent viscosity of each polymer solution according to obtained in step 3- step 5, residual resistance factor, recovery ratio
Increase rate establishes the correlation figure between apparent viscosity, residual resistance factor and recovery ratio increase rate three；
Recovery ratio increase rate is 5 percent or more data in correlation figure in step 7, selecting step 6, and analyzes it
The influence relationship of middle apparent viscosity, residual resistance factor to recovery ratio increase rate；
Step 8 judges the influence size of apparent viscosity, residual resistance factor to recovery ratio increase rate, so that it is determined that oil reservoir out
Under the conditions of to the performance requirement of polymeric system, corresponding polymeric system is established finally by synthesis, when the influence of apparent viscosity
Power is greater than residual resistance factor, then the performance of polymeric system is low residual resistance factor, high viscosity；When the influence of apparent viscosity
Power is less than residual resistance factor, then the performance of polymeric system is high residual resistance factor, low-viscosity；When the influence of apparent viscosity
Power is equal to residual resistance factor, then the performance of polymeric system is high residual resistance factor, low-viscosity or low residual resistive system
Number, low-viscosity.
2. a kind of method for being effectively improved hypertonic high water-cut reservoir polymer flooding effect according to claim 1 is set, special
Sign is that reservoir condition includes the Crude viscosity of oil reservoir, the porosity of oil reservoir, Permeability Parameters, the temperature of oil reservoir in the step 1
Degree condition, oil reservoir non-homogeneous degree, oil reservoir clay mineral content.
3. a kind of method for being effectively improved hypertonic high water-cut reservoir polymer flooding effect according to claim 2 is set, special
Sign is, according to apparent viscosity, residual resistance factor, recovery ratio increase rate multi-group data in the step 6, by matlab
Platform calculates three's degree of association using grey correlation methods, obtains the correlation figure of three.
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| CN110457857B (en) * | 2019-08-21 | 2022-11-15 | 中国海洋石油集团有限公司 | Method for predicting polymer flooding effect under different crude oil viscosity conditions |
| CN110489873B (en) * | 2019-08-21 | 2022-11-01 | 中国海洋石油集团有限公司 | Method for selecting polymer solution performance parameters under different crude oil viscosity conditions |
| CN110927026B (en) * | 2019-12-26 | 2022-04-22 | 东北石油大学 | Simulation method for evaluating deep migration characteristic of polymer microsphere in porous medium |
| CN112145139B (en) * | 2020-10-26 | 2022-02-01 | 西南石油大学 | Method for reasonably mapping polymer flooding use concentration by crude oil viscosity |
| CN113916747B (en) * | 2021-10-14 | 2023-09-15 | 重庆科技学院 | Revision method applied to viscoelastic fluid test starting pressure gradient |
| CN115306370B (en) * | 2022-08-10 | 2023-11-24 | 重庆科技学院 | Experimental device and method for online monitoring of residual resistance coefficient of polymer |
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| US4249608A (en) * | 1979-05-09 | 1981-02-10 | Texaco Inc. | Polymer-containing fluid and an oil recovery method using the fluid |
| BR112015016533B1 (en) * | 2013-01-31 | 2022-06-07 | Championx Usa Inc | Method for recovering a hydrocarbon fluid from an underground formation, water-soluble polymer and composition |
| CN103995083B (en) * | 2014-05-13 | 2016-02-10 | 中国石油天然气股份有限公司 | A kind of method evaluating polymer gel profile control agent oil reservoir conformability |
| CN104792659B (en) * | 2015-04-20 | 2018-01-12 | 西南石油大学 | For determining the secondary shear method of Polymer Used For Oil Displacement solution property parameter |
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