CN108915652A - A kind of method of effective judgement polymer flooding fluidity control time range - Google Patents
A kind of method of effective judgement polymer flooding fluidity control time range Download PDFInfo
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- CN108915652A CN108915652A CN201810788998.4A CN201810788998A CN108915652A CN 108915652 A CN108915652 A CN 108915652A CN 201810788998 A CN201810788998 A CN 201810788998A CN 108915652 A CN108915652 A CN 108915652A
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- 229920000642 polymer Polymers 0.000 title claims abstract description 65
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims abstract description 23
- 230000008569 process Effects 0.000 claims abstract description 17
- 238000011084 recovery Methods 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000000694 effects Effects 0.000 claims description 7
- 238000010835 comparative analysis Methods 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 4
- 230000008859 change Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 24
- 238000005516 engineering process Methods 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 241000406668 Loxodonta cyclotis Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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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- 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
- E21B47/00—Survey of boreholes or wells
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Abstract
The present invention relates to a kind of methods for effectively judging polymer flooding fluidity control time range, and steps are as follows：1) the water driving characteristics curve under the conditions of target reservoir is analyzed, injection PV number and moisture content (f are obtainedwThe relation curve of)/recovery percent of reserves (R*)；2) f is establishedwThe WATER FLOODING CHARACTERISTIC CURVE of-R*, and linear line section is fitted, obtain the formula of description curve；3) the performance graph feature of analyzing polymers oil displacement process, and it is converted into fwThe displacement characteristics curve of-R* determines the subsequent waterflooding time started, is fitted the Water-flooding characteristics formula in subsequent waterflooding stage；5) starting point and WATER FLOODING CHARACTERISTIC CURVE formula contrast of fit range are constantly adjusted, when the two is close (error is no more than 10%), it can determine that polymer flooding influences to fail on subsequent waterflooding, that is the range effective subsequent waterflooding control range for being polymer flooding, in addition polymer flooding controls the time, it is exactly polymer flooding fluidity control time range.
Description
Technical field
The invention belongs to oil-gas field development fields, are related to a kind of side for effectively judging polymer flooding fluidity control time range
Method.
Background technique
In China, 90% or more oil field will be gathered into each elephant of high water-cut stage already using waterflooding extraction
It closes object and drives technology as the main means for improving recovery efficiency technique, and by tackling key problems for many years, polymer flooding and its matching technology
Mature, and great success is obtained in multiple oil fields.
Polymer flooding is used in water-drive pool as modified water driving technology and improves recovery ratio, and the mechanism of action is exactly to increase
The solution viscosity for adding displacing phase reduces the relative permeability of displacing phase, so as to improve unfavorable mobility ratio.Resistance is used in oil displacement process
Two nondimensional numbers of coefficient (RF) and residual resistance factor (RFF) characterize the fluidity control and subsequent waterflooding mistake of its oil displacement process
Reduction phase permeability effect in journey, however limited polymer injection rate is the stabilization being difficult to set up in seepage flow characteristics experiment
Residual resistance factor.Therefore, the subsequent waterflooding in displacement process can make the polymer of injection be difficult to effectively be detained, by a relatively large margin
Displacement phase permeability is reduced, a certain amount of water drive can make polymer flooding function and effect fail.And rarely have at present around polymer flooding
The research of effective acting time, time range i.e. theoretic range understanding to its effective fluidity control：I.e. in the displacement of reservoir oil
The fluidity control time range of polymer flooding includes two parts of polymer flooding process and part subsequent waterflooding process in the process.It is right
In the subsequent waterflooding time range controlled by polymer flooding, none specifically recognizes and describes.
Therefore, it is necessary to which the time range for polymer flooding fluidity control is studied, it is poly- to establish a kind of effectively judgement
The method for closing the object fluidity control time.
Summary of the invention
The purpose of the invention is to probe into polymer displacement of reservoir oil effective acting time, and the one kind designed effectively judgement polymerization
The method of object drive fluidity control time range.This method comprises the following steps：
Step (1)：Carry out indoor flood pot test, analyzes the water driving characteristics curve under the conditions of target reservoir, infused
Enter PV number and moisture content (fwThe Relationship Between Dynamic Change curve of)/recovery percent of reserves (R*).
Step (2)：Establish fwThe WATER FLOODING CHARACTERISTIC CURVE of-R*, and it is quasi- to carry out formula to the preferable line interval of linear relationship
It closes, obtains the formula of Expressive Features curve.
Step (3)：Carry out polymer displacement of reservoir oil experimental study, the performance graph feature of analyzing polymers oil displacement process.
Step (4)：F is converted by the performance graph of Polymer FloodingwThe displacement characteristics curve of-R* is determined to gather
It closes object and drives process range and subsequent waterflooding time started, be fitted the Water-flooding characteristics formula of subsequent waterflooding range, constantly adjustment is quasi-
Close the starting point of range；
Step (5)：Subsequent waterflooding indicatrix formula under the conditions of comparative analysis difference starting point, with WATER FLOODING CHARACTERISTIC CURVE public affairs
Formula can determine that polymer flooding influences to fail on subsequent waterflooding, i.e. the range when the two is close (error is no more than 10%)
It is effective subsequent waterflooding control range of polymer flooding, in addition polymer flooding controls the time, when being exactly polymer flooding fluidity control
Between range.
As the perfect of technology, PV number and moisture content (f are injected in acquisition described in step (1)w)/recovery percent of reserves (R*) is moved
State variation relation curve is primarily referred to as establishing flood pot test indoors according to reservoir condition, reaches 95% stopping reality in moisture content
It tests.The recovery percent of reserves and moisture content data for recording different injection PV number water drives draw out injection water PV according to experimental data
Several and moisture content (fwThe Relationship Between Dynamic Change curve graph of)/recovery percent of reserves (R*).
As the perfect of technology, WATER FLOODING CHARACTERISTIC CURVE f described in step (2)w- R* refers to that oilfield exploitation practical experience is summarized
A kind of method out is described generally by the relationship between the cumulative water production and cumulative oil production during use
, formula is represented by：fw=aln (R*)-b, a indicate slope；B is constant.
As the perfect of technology, the performance graph feature of analyzing polymers oil displacement process described in step (3), which refers to, to be passed through
The plot of water cut cone of depression and injection rate substantially judge the useful effect control time during polymer flooding.
As the perfect of technology, when determining that polymer flooding process range and subsequent waterflooding start described in step (4)
Between, be fitted subsequent waterflooding range Water-flooding characteristics formula, constantly adjust fit range starting point refer to since subsequent waterflooding to
The curve that subsequent waterflooding terminates to start at 1 point to the end to first point of rear water drive first is fitted, and is then opened from second point
1 point of the curve to the end that begins is fitted, and so gradually recursion is gone down.
Subsequent waterflooding indicatrix as the perfect of technology, under the conditions of comparative analysis difference starting point described in step (5)
Formula terminates fitting when the two is close (error is no more than 10%) and refers to step (4) institute with WATER FLOODING CHARACTERISTIC CURVE formula
WATER FLOODING CHARACTERISTIC CURVE fitting formula brings identical moisture content (f into simultaneously before the formula and polymer flooding of fittingw) or band simultaneously
Enter the identical calculated R* or f of R* institutewError is within 5%, i.e., the range is that effective subsequent waterflooding of polymer flooding controls
Range, in addition polymer flooding controls the time, it is exactly polymer flooding fluidity control time range.
The present invention provides a kind of methods for effectively judging polymer flooding fluidity control time range, to pass through polymer flooding
Production performance curve judges that polymer flooding fluidity control time range provides a kind of reasonable analysis mode.
Detailed description of the invention
The method of polymer flooding fluidity control time range, which is made into one, effectively to be judged to one kind of the invention with reference to the accompanying drawing
Walk explanation：
Fig. 1 water drive oil performance graph
The WATER FLOODING CHARACTERISTIC CURVE f of Fig. 2 bring-into-oil curve conversionw-R*
Fig. 3 polymer displacement of reservoir oil performance graph
Fig. 4 polymer displacement of reservoir oil performance graph is converted into indicatrix and carries out formula fitting to rear WATER DISPLACEMENT CURVES
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Step (1)：According to reservoir condition, the displacement of reservoir oil with experiment crude oil be Bohai SZ 36-1 ground deaerate dewatered oil,
Viscosity is 70mPas (65 DEG C)；Experiment rock core is the fill out sand tube of 25 × 500mm of φ, mean permeability 2500mD, porosity
It is 31%；Experiment is AP-P4 with polymer, and concentration 1750mg/L, injection slug is 0.3PV；The mineralising of practice ground layer water
Degree is 9374mg/L, viscosity 0.6mPas, and composition is shown in Table 1：
1 Bohai Sea injected water salinity of table composition
Record injection water PV number, Liquid output calculate moisture content and recovery percent of reserves.It is as shown in Figure 1 to draw bring-into-oil curve
Water filling is broken through in 0.20PV or so, moisture content rapid increase after breakthrough, and 0.60PV or so enters high water-cut stage
Step (2)：It regard recovery percent of reserves (R*) in step (1) bring-into-oil curve as abscissa, moisture content (fw) as vertical
Coordinate converts WATER FLOODING CHARACTERISTIC CURVE as shown in Fig. 2, WATER FLOODING CHARACTERISTIC CURVE formula is for water drive oil performance graph：Y=
73.966ln(x)-168。
Step (3)：According to speed 1mL/min, the polymer flooding solution that 0.3PV concentration is 1750mg/L is injected, after
The continuous water drive stage.Continue to inject water flooding according to speed 1mL/min, until moisture content reaches 95% stopping experiment.Draw polymerization
During object displacement of reservoir oil curve from curve graph as shown in figure 3, can be seen that and cover entire 0.3PV polymer flooding containing hyponome, add up
The further amplification of recovery ratio is also since taking effect polymer flooding.
Since the fluidity control of polymer is limited, after moisture content drops to minimum point, it is difficult to improve involve again, mainly with
Based on washing oil, moisture content bottom out.By the analysis of plot of water cut and injection rate, substantially it is considered that polymer flooding mistake
Journey useful effect control the time be include entirely infuse collecting process.
Step (4)：It regard recovery percent of reserves (R*) in step (3) polymer displacement of reservoir oil curve as abscissa, moisture content (fw) make
By water drive oil performance graph WATER FLOODING CHARACTERISTIC CURVE is converted for ordinate as shown in figure 4, WATER FLOODING CHARACTERISTIC CURVE (f before metaideophonew-R*
Relationship, y=74.271ln (x) -168.89) with pure water drive the consistent (f of the indicatrix of processw- R* relationship, y=73.966ln
(x) -168), constantly the starting point of adjustment fit range, the Water-flooding characteristics formula for being fitted subsequent waterflooding range are as shown in the table：
Step (5)：WATER FLOODING CHARACTERISTIC CURVE formula y=72.569ln when taking instantaneous moisture content 92.73% in step (4) table
(x) it -189.91 basically reaches unanimously with WATER FLOODING CHARACTERISTIC CURVE y=74.271ln (x) -168.89 before polymer flooding by recovery percent of reserves
49.5% bring into y=74.271ln (x) -168.89 solve moisture content error be 5.82%, this shows the water drive from the moment
Process is no longer influenced by polymer flooding process, completely into the water drive law stage.That is in the condition of the oil displacement experiment
Under, subsequent waterflooding 0.27PV post-consumer polymer drives function and effect and disappears.
Above embodiment, which is intended to illustrate the present invention, to be realized or use for professional and technical personnel in the field, to above-mentioned
Embodiment, which is modified, will be readily apparent to those skilled in the art, therefore the present invention includes but is not limited to
Above embodiment, it is any to meet the claims or specification description, meet with principles disclosed herein and novelty,
The method of inventive features, technique, product, fall within the scope of protection of the present invention.
Claims (3)
1. a kind of method for effectively judging polymer flooding fluidity control time range, includes the following steps：
Step (1)：Carry out indoor flood pot test, analyze the water driving characteristics curve under the conditions of target reservoir, obtains injection PV
Several and moisture content (fwThe Relationship Between Dynamic Change curve of)/recovery percent of reserves (R*).
Step (2)：Establish fwThe WATER FLOODING CHARACTERISTIC CURVE of-R*, and formula fitting is carried out to the preferable line interval of linear relationship, it obtains
Obtain the formula of Expressive Features curve.
Step (3)：Carry out polymer displacement of reservoir oil experimental study, the performance graph feature of analyzing polymers oil displacement process.
Step (4)：F is converted by the performance graph of Polymer FloodingwThe displacement characteristics curve of-R*, determines polymer flooding
Process range and subsequent waterflooding time started are fitted the Water-flooding characteristics formula of subsequent waterflooding range, constantly adjustment fit range
Starting point；
Step (5)：Subsequent waterflooding indicatrix formula under the conditions of comparative analysis difference starting point, and WATER FLOODING CHARACTERISTIC CURVE formula,
When the two is close (error is no more than 10%), that is, it can determine that polymer flooding influences to fail on subsequent waterflooding, i.e., the range is
Effective subsequent waterflooding control range of polymer flooding, in addition polymer flooding controls the time, it is exactly the polymer flooding fluidity control time
Range.
2. a kind of method for effectively judging polymer flooding fluidity control time range according to claim 1, it is characterized in that：
The performance graph feature of analyzing polymers oil displacement process described in step (3) refers to through the plot of water cut cone of depression and injection
Amount substantially judges the useful effect control time during polymer flooding.
3. the subsequent waterflooding indicatrix formula under the conditions of comparative analysis difference starting point according to claim 1, with water drive
Indicatrix formula terminates fitting when the two is close (error is no more than 10%) and refers to the formula for being fitted step (4)
Identical moisture content (f is brought into simultaneously with WATER FLOODING CHARACTERISTIC CURVE fitting formula before polymer floodingw) or bring identical R* into simultaneously
The calculated R* or f of institutewError is within 5%, i.e. the range effective subsequent waterflooding control range for being polymer flooding, in addition poly-
It closes object and controls the time processed, be exactly polymer flooding fluidity control time range.
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| CN201810788998.4A CN108915652B (en) | 2018-07-18 | 2018-07-18 | Method for effectively judging polymer flooding degree control time range |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006095291A1 (en) * | 2005-03-08 | 2006-09-14 | Schlumberger Canada Limited | Well treatment composition crosslinkers and uses thereof |
| US20110315383A1 (en) * | 2010-06-23 | 2011-12-29 | Leiming Li | Gelation acceleration |
| CN106014359A (en) * | 2016-06-08 | 2016-10-12 | 西南石油大学 | Method for judging earliest injection transfer opportunity of early-stage polymer injection of offshore oil deposit |
| CN106056460A (en) * | 2016-06-01 | 2016-10-26 | 中国海洋石油总公司 | Calculation method for determining contribution of chemical flooding in enhancing recovery ratio |
| CN106050196A (en) * | 2016-06-08 | 2016-10-26 | 西南石油大学 | Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir |
| CN107957981A (en) * | 2017-12-04 | 2018-04-24 | 中国石油大学(华东) | A kind of ternary composite oil-displacing system takes effect a little definite method and device |
-
2018
- 2018-07-18 CN CN201810788998.4A patent/CN108915652B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006095291A1 (en) * | 2005-03-08 | 2006-09-14 | Schlumberger Canada Limited | Well treatment composition crosslinkers and uses thereof |
| US20110315383A1 (en) * | 2010-06-23 | 2011-12-29 | Leiming Li | Gelation acceleration |
| CN106056460A (en) * | 2016-06-01 | 2016-10-26 | 中国海洋石油总公司 | Calculation method for determining contribution of chemical flooding in enhancing recovery ratio |
| CN106014359A (en) * | 2016-06-08 | 2016-10-12 | 西南石油大学 | Method for judging earliest injection transfer opportunity of early-stage polymer injection of offshore oil deposit |
| CN106050196A (en) * | 2016-06-08 | 2016-10-26 | 西南石油大学 | Method for determining good transfer-injection opportunity for early polymer injection of offshore heavy oil reservoir |
| CN107957981A (en) * | 2017-12-04 | 2018-04-24 | 中国石油大学(华东) | A kind of ternary composite oil-displacing system takes effect a little definite method and device |
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