CN106150463B - A kind of Conglomerate Reservoir polymer flooding injection pressure increasing degree determines method - Google Patents
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- 238000002347 injection Methods 0.000 title claims abstract description 102
- 239000007924 injection Substances 0.000 title claims abstract description 102
- 229920000642 polymer Polymers 0.000 title claims abstract description 48
- 230000001965 increasing effect Effects 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000035699 permeability Effects 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 12
- 238000006467 substitution reaction Methods 0.000 claims description 3
- 230000004069 differentiation Effects 0.000 abstract description 2
- 238000011002 quantification Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 7
- 235000003181 Panax pseudoginseng Nutrition 0.000 description 6
- 244000131316 Panax pseudoginseng Species 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
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- 238000002513 implantation Methods 0.000 description 1
- 230000006872 improvement Effects 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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Abstract
It provides a kind of Conglomerate Reservoir polymer flooding injection pressure increasing degree and determines method, include the following steps：(a) acquisition injection well group core intersection h, injector producer distance r, wellbore radius rw, the poly- viscosity, mu of note and injection rate q；(b) mean permeability k is calculated：K is injection well group injection well and extraction well permeability kiAverage value；(c) according to the mean permeability k obtained in step (b), coefficient T of averagely advancing by leaps and bounds is calculatedk, coefficient T of averagely advancing by leaps and boundskIt is injection well group injection well and extraction well is advanced by leaps and bounds the average value of coefficient；(d) maximum injection pressure increasing degree Δ P is calculatedmax.Conglomerate Reservoir polymer flooding injection pressure increasing degree of the present invention determines method, clear principle, quantification, operability are strong, it is easy to use, reduce and injection parameter was determined by live injection test in the past, it solves Conglomerate Reservoir difference well group and uses differentiation injection parameter, greatly improve timeliness, saved cost.
Description
Technical field
The invention belongs to oil development reservoir engineering technical fields, are injected more particularly, to a kind of Conglomerate Reservoir polymer flooding
Pressure increasing degree determines method.
Background technology
It improves oil recovery factor and has become countries in the world question of common concern.As the industrialized popularization of polymer flooding is answered
With it is undeniable that polymer solution can significantly increase oil recovery factor.The basic principle of polymer displacement of reservoir oil is to pass through increase
The viscosity of displacing phase improves oil and water mobility ratio, and the permeability of injection well high permeability formation is reduced using polymer, involves body to expand
Product, and then improve oil displacement efficiency.Injection pressure calculating is the pith of polymer displacement of reservoir oil parameter designing, is polymerize to rational
Object Drainage process is of great significance.
The principal element for influencing polymer flooding injection pressure has reservoir property, injector producer distance, injection rate, injected media
Deng.The quality of reservoir geology condition is an important factor for influencing the variation of polymer flooding injection pressure, and formation capacity is smaller, in oil reservoir
The filtrational resistance of fluid is bigger, and injection pressure ascensional range is bigger, and vice versa；The rising value of polymer flooding injection pressure
With the relationship manyfold also bigger than quadratic relationship of injector producer distance, therefore the variation of injector producer distance injection pressure is influenced it is maximum,
The reason is that injector producer distance is bigger, the irritability between injection-production well is poorer, and polymer driving is also more difficult；Polymer flooding mobility
Smaller, injection pressure rising value is bigger, and its mobility is related with polymer viscosity, and polymer molecular weight is bigger, and viscosity is got over
Greatly, (implantation concentration is higher, and viscosity is also bigger), the absorption, trapping in oil reservoir are more, and reservoir permeability declines more
Greatly, injection pressure rises bigger.Polymer flooding injection pressure is directly proportional with its injection rate, because injection rate is bigger, note
It is bigger to enter resistance；Polymer flooding injection pressure is directly proportional to injection intensity, because injection intensity is bigger, filtrational resistance is bigger, from
And injection pressure is bigger.During polymer flooding, the injection pressure initial stage rate of climb is fast, but after injection a period of time, injection
Pressure level-off and steadily increasing, notes the normal variation of poly- pressure when this is polymer flooding；However, and not all well note it is poly-
Pressure all follows such rule, and the oil increasing effect of polymer flooding is also not quite similar.Injection pressure rising is too fast, on the one hand easily makes
Increase at injection-production ratio, injection is difficult, another aspect strata pressure rapid increase, and producing pressure differential increases, and makes injection of polymer solution
Along microcrack, stratification channelling, Liquid output is caused to decline, produces poly- concentration and rise.Injection pressure rose slowly, failed to change former seepage flow
Path, expansion involve range, the inefficient of polymer solution are caused to recycle.
The injection pressure noted in collecting process rises, and can be described with the variation of Hall Curve slope, using Hall Curve
Slope calculates apparent resistance factor.The rational resistance coefficient of middle and high infiltration sandstone is 2.2 or so, and resistance coefficient is too big, illustrates injection pressure
Power rises soon, and opposite resistance coefficient is too small, and it is slow to illustrate that injection pressure rises.
Seepage force is used in " 4~6 area north block of apricot north notes poly- initial stage pressure increasing degree law study " that Chen Yongda etc. is delivered
It gains knowledge and carries out deriving analysis, it may be determined that pressure increasing degree and maximum pressure increasing degree in note collecting process, but this method is to be based on homogeneous
Model, result of calculation have a certain difference with actual production.
Conglomerate Reservoir has in the deposition characteristics different from conventional sandstone reservoir, complicated pore structure and plane and hangs down
Heterogeneous reservoirs on section bring great difficulty to the exploitation of Conglomerate Reservoir.Currently, Conglomerate Reservoir polymer flooding is noted
Enter pressure and be only limitted to qualitative description, and cannot predict the increasing degree of pressure after well group injection of polymer solution.Since Conglomerate Reservoir stores up
Layer anisotropism is strong, and each well group is differed greatly using identical injection parameter and system pressure increasing degree, seriously affects oil increasing effect.
Invention content
In view of the above technical problems, the purpose of the present invention is to provide a kind of Conglomerate Reservoir polymer flooding injection pressure increasing degrees
Determine method, with solve in process of polymer flooding development pressure increasing degree can not Accurate Prediction, the blindness of injection parameter adjustment asks
Topic, optimizes for polymer flooding injection parameter, and Efficient Development provides strong technical support.
The technical solution adopted by the present invention is：
A kind of Conglomerate Reservoir polymer flooding injection pressure increasing degree determines method, includes the following steps：
(a) acquisition injection well group core intersection h, injector producer distance r, wellbore radius rw, the poly- viscosity, mu of note and injection rate q；
(b) mean permeability k is calculated：K is the average value of injection well group injection well and extraction well permeability；
(c) according to the mean permeability k obtained in step (b), coefficient T of averagely advancing by leaps and bounds is calculatedk, coefficient T of averagely advancing by leaps and boundskIt is
Injection well group injection well and extraction well are advanced by leaps and bounds the average value of coefficient；
(d) maximum injection pressure increasing degree Δ P is calculatedmax：By the above parameter substitution formula (3), you can obtain the maximum of injection well
Injection pressure increasing degree,
Wherein, q is diurnal injection；μ is the viscosity of injected media；TkFor coefficient of averagely advancing by leaps and bounds；H is core intersection；rwFor well
Cylinder radius；K is mean permeability；R is injector producer distance.
Conglomerate Reservoir polymer flooding injection pressure increasing degree of the present invention determines method, wherein (1) calculates step as the following formula
Suddenly mean permeability k described in (b)；
Wherein, kiFor injection well group injection well and extraction well permeability.
Conglomerate Reservoir polymer flooding injection pressure increasing degree of the present invention determines method, wherein (2) calculate step as the following formula
Suddenly it averagely advances by leaps and bounds described in (c) coefficient Tk；
Wherein, kmaxiFor injection well group injection well and extraction well maximum permeability.
Advantageous effect of the present invention：
Conglomerate Reservoir polymer flooding injection pressure increasing degree of the present invention determines method, this method application oil reservoir (well group)
Static reservoir properties, core intersection, coefficient of advancing by leaps and bounds, injector producer distance, Dynamic injection speed and polymer viscosity parameter can be true
Determine injection pressure biggest advance, the method for the present invention clear principle, quantification, operability are strong, are easy to use, and join for polymer flooding
Number optimization, live tracking adjustment provide reliable foundation；The present invention has filled up Conglomerate Reservoir polymer flooding injection pressure increasing degree
The blank quantitatively determined reduces and determined injection parameter by live injection test in the past, solves Conglomerate Reservoir difference well group and adopts
With differentiation injection parameter, timeliness is greatly improved, has saved cost.
Specific implementation mode
The present embodiment is by taking seven east of Karamay Oil Fields in Xinjiang, 1st area polymer flooding experiment as an example, in the injection polymerization of in September, 2006
Object solution, in October, 2012 terminate, and determine maximum pressure increasing degree using the present embodiment method, instruct polymer injection parameter optimization, gather and drive
Development effectiveness is preferable.Trial zone accumulation volume increase 17.4 ten thousand tons, stage recovery percent of reserves 9.0%, compared with water drive end, moisture content by
94.5% drops to 67.5%, and rate of oil production is increased to 3.9% by 0.5%.
A kind of Conglomerate Reservoir polymer flooding injection pressure increasing degree of the present embodiment determines method, includes the following steps：
(a) acquisition injection well group core intersection h, injector producer distance r, wellbore radius rw, the poly- viscosity, mu of note and injection rate q, adopt
It is as shown in table 1 to collect parameter；
(b) (1) calculates mean permeability k according to the following formula：K is injection well group injection well and extraction well permeability kiBe averaged
Value, permeability kiSupplemental characteristic is as shown in table 2, and mean permeability k result of calculations are as shown in table 3；
(c) according to the mean permeability k obtained in step (b), (2) calculate coefficient T of averagely advancing by leaps and bounds as the following formulak：It is average prominent
Into coefficient TkIt is injection well group injection well and extraction well is advanced by leaps and bounds the average value of coefficient, wherein kmaxiFor injection well group injection well and adopt
Go out well maximum permeability, kmaxiSupplemental characteristic is as shown in table 4, coefficient T of averagely advancing by leaps and boundskResult of calculation is as shown in table 5；
(d) maximum injection pressure increasing degree Δ P is calculatedmax：By the above parameter substitution formula (3), you can obtain the maximum of injection well
Injection pressure increasing degree, Δ PmaxResult of calculation is as shown in table 6,
Wherein, q is diurnal injection, m3/d；μ is the viscosity of injected media, mPa.s；Tk is coefficient of averagely advancing by leaps and bounds；H is oil
Layer thickness, m；rwFor wellbore radius, m；K is mean permeability, mD；R is injector producer distance, m.
The eastern 1 area polymer flooding trial zone parameter acquisition table of 1 In Karamay Oil pseudo-ginseng of table
The eastern 1 area polymer flooding trial zone Permeability Parameters tables of data of 2 In Karamay Oil pseudo-ginseng of table
The eastern 1 area polymer flooding trial zone mean permeability result of calculation of 3 In Karamay Oil pseudo-ginsengs
The eastern 1 area polymer flooding trial zone of 4 In Karamay Oil pseudo-ginseng of table is advanced by leaps and bounds coefficient data table
The eastern 1 area polymer flooding trial zone of 5 In Karamay Oil pseudo-ginseng of table is averagely advanced by leaps and bounds coefficient result of calculation
The eastern 1 area polymer flooding trial zone maximum injection pressure increasing degree result of calculation of 6 In Karamay Oil pseudo-ginseng of table
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
It encloses and is defined, under the premise of not departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made should all be fallen into the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of Conglomerate Reservoir polymer flooding injection pressure increasing degree determines method, it is characterised in that：Include the following steps：
(a) acquisition injection well group core intersection h, injector producer distance r, wellbore radius rw, the poly- viscosity, mu of note and injection rate q；
(b) mean permeability k is calculated：K is the average value of injection well group injection well and extraction well permeability；
(c) according to the mean permeability k obtained in step (b), coefficient T of averagely advancing by leaps and bounds is calculatedk, coefficient T of averagely advancing by leaps and boundskIt is that note is poly-
Well group injection well and extraction well are advanced by leaps and bounds the average value of coefficient；
(d) maximum injection pressure increasing degree Δ P is calculatedmax：By the above parameter substitution formula (3), you can obtain the maximum injection of injection well
Pressure increasing degree,
Wherein, q is diurnal injection；μ is the viscosity of injected media；TkFor coefficient of averagely advancing by leaps and bounds；H is core intersection；rwFor pit shaft half
Diameter；K is mean permeability；R is injector producer distance.
2. Conglomerate Reservoir polymer flooding injection pressure increasing degree according to claim 1 determines method, it is characterised in that：It presses
Formula (1) calculates mean permeability k described in step (b)；
Wherein, kiFor injection well group injection well and extraction well permeability.
3. Conglomerate Reservoir polymer flooding injection pressure increasing degree according to claim 1 or 2 determines method, it is characterised in that：
(2) calculate coefficient T of averagely advancing by leaps and bounds described in step (c) as the following formulak；
Wherein, kmaxiFor injection well group injection well and extraction well maximum permeability.
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| CN112343566B (en) * | 2019-08-08 | 2022-12-02 | 中国石油天然气股份有限公司 | Method and device for determining bottom hole flowing pressure of injection polymer well |
| CN112443317A (en) * | 2019-08-29 | 2021-03-05 | 中国石油天然气股份有限公司 | Method and system for determining wellhead pressure of simulated chemical flooding injection well |
| CN113006752B (en) * | 2019-12-19 | 2023-08-22 | 中国石油天然气股份有限公司 | Method and device for predicting injection pressure |
| CN111927413B (en) * | 2020-08-11 | 2022-04-08 | 中海石油(中国)有限公司 | Method for determining reasonable bottom hole pressure of constant-pressure injection of polymer injection well |
| CN114810014A (en) * | 2021-01-29 | 2022-07-29 | 中国石油化工股份有限公司 | Polymer profile control method based on pressure pulse |
| CN113250663B (en) * | 2021-06-23 | 2022-11-04 | 中国石油大学(华东) | Optimal design method for injection parameters of emulsion-polymer composite system of medium-low permeability reservoir |
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Effective date of registration: 20201109 Address after: Intercontinental building, 16 ande Road, Dongcheng District, Beijing, 100007 Patentee after: PetroChina Co.,Ltd. Address before: 834000 No. 29, Junggar Road, Karamay District, the Xinjiang Uygur Autonomous Region, Karamay Patentee before: RESEARCH INSTITUTE OF EXPLORATION & DEVELOPMENT, PETROCHINA XINJIANG OILFIELD Co. |
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