CN108590571A - A kind of Low-permeability, fractured water breakthrough oil reservoir determines method for Profile Control in Injection Well agent dosage - Google Patents
A kind of Low-permeability, fractured water breakthrough oil reservoir determines method for Profile Control in Injection Well agent dosage Download PDFInfo
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- CN108590571A CN108590571A CN201810258211.3A CN201810258211A CN108590571A CN 108590571 A CN108590571 A CN 108590571A CN 201810258211 A CN201810258211 A CN 201810258211A CN 108590571 A CN108590571 A CN 108590571A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 238000002347 injection Methods 0.000 title claims abstract description 117
- 239000007924 injection Substances 0.000 title claims abstract description 117
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000013461 design Methods 0.000 claims abstract description 19
- 150000003839 salts Chemical class 0.000 claims abstract description 16
- 239000003129 oil well Substances 0.000 claims abstract description 15
- 230000008859 change Effects 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims abstract description 12
- 230000000630 rising effect Effects 0.000 claims abstract description 12
- 235000020681 well water Nutrition 0.000 claims abstract description 12
- 239000002349 well water Substances 0.000 claims abstract description 8
- 241001269238 Data Species 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000035699 permeability Effects 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 3
- 238000000605 extraction Methods 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000013215 result calculation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B43/20—Displacing by water
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- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
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Abstract
A kind of Low-permeability, fractured water breakthrough oil reservoir of present invention offer determines method for Profile Control in Injection Well agent dosage, sees that the injection water time calculates underground and effectively controls volume using producing well, and then calculate Amount of profile control agent, specifically includes following steps：Step 1：Determination can profile control water injection well, inquire the water injection well and correspond to all producing well historical production datas；Step 2：According to the aqueous rising of producing well history in well group and salt content situation of change, judge that each oil-extracting well water injection well is shown in the injection water time in the well group；Step 3：According to the water breakthrough time for the producing well for seeing injection water in well group at first, the control volume of the water injection well is calculated；Step 4：Profile control agent injects 0.2 0.3 times of water injection rate volume when dosage is oil well water breakthrough.The present invention can be scientific and reasonable carry out Amount of profile control agent design, to greatest extent improve intake profile, expand swept volume, to improve the validity of profile control measures.
Description
Technical field
The invention belongs to technical field of petroleum industry, and in particular to a kind of Low-permeability, fractured water breakthrough oil reservoir is for water injection well tune
It cuts open agent dosage and determines method.
Background technology
The dosage design of profile control agent is mainly the following at present：One assumes that profile control object is homogeneous reservoir, according to side
Case designs radius of profile control and calculates injected slurry volume；Second is that PI (Pressure Index) and RE (Reservoir Engineering)
The Amount of profile control agent of decision-making technic determines method, and the injection test experiment at scene is needed to determine use level coefficient；Second is that method for numerical simulation,
The processes such as history matching, multistage plug combined prediction are needed, are taken longer；Third, front and back injectability ratio method, needs in advance really
It sets the tone and cuts open the ratio between the water absorbing capacity of interval before and after the processing, flexibility is poor.
The prior art has following design Amount of profile control agent to design：
（1）W=β hf Δ PI ', W is Amount of profile control agent in formula, and unit is cubic meter；β is use level coefficient, and unit is m3/（MPa·
m）；Hf is the thickness of water filling layer, and unit is m；Δ PI ' is the variable quantity of PI values before and after injection test profile control agent, and unit is MPa.
（2）W=HS Ф, W is Amount of profile control agent in formula, and unit is cubic meter；H is profile control thickness, and unit is rice, and S is profile control
Area, unit are square metre that Ф is the degree of control of profile control interval, and unit is %.
（3）The total Amount of profile control agent of W=α, W is Amount of profile control agent in formula, and unit is cubic meter；α is tested according to indicative curve
As a result calculation of distribution coefficient.
Invention content
In order to overcome the problems, such as it is existing time-consuming, flexibility difference is ineffective, the present invention provides a kind of Low-permeability, fractured and sees
Water oil reservoir determines method, the scientific and reasonable carry out Amount of profile control agent design of the present invention, maximum limit for Profile Control in Injection Well agent dosage
The improvement intake profile of degree expands swept volume, to improve the validity of profile control measures.
The technical solution adopted by the present invention is：
A kind of Low-permeability, fractured water breakthrough oil reservoir determines method for Profile Control in Injection Well agent dosage, it is characterised in that：Utilize producing well
See that the injection water time calculates underground and effectively controls volume, and then calculate Amount of profile control agent, specifically includes following steps：
Step 1 determine can profile control water injection well, inquire the water injection well and correspond to all producing well historical production datas；
Step 2 judges each oil recovery in the well group according to the aqueous rising of producing well history in well group and salt content situation of change
Well water injection well is shown in the injection water time；
Step 3 calculates the control volume of the water injection well according to the water breakthrough time for the producing well for seeing injection water in well group at first；
Step 4 profile control agent injects 0.2-0.3 times of water injection rate volume when dosage is oil well water breakthrough.
In the step 1, determination can profile control water injection well the specific steps are：
1）The well head pressure depression curve of each well in block is tested；Ensure the work of neighbouring each well in testing time section
Condition does not change, and for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours or more；
2）After the completion of test, the pressure index PI values of each well are calculated；
3）All wells in calculation blockIPIAverage value, selection are less than blockIPIThe water injection well of average value is profile control well, etc.
In or higher than block it is averageIPIThe water injection well of average value is disregarded.
The step 2）In, calculate the PI values of each well：
In formula：
PIFor the pressure index of well, MPa；
PFor the well well head pressure changed with the closed-in time, MPa；
tFor closed-in time, min, for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours.
The step 3）In, all wells in calculation blockIPIAverage value：
In formula：IPIFor the PI values after zero dimension；
k i For reservoir original permeability, μm2；
hFor reservoir effective thickness, m；
qFor the injection rate of water injection well, m3/d；
μFor the fluid viscosity in reservoir, mPas；
PIFor the pressure index of well, MPa.
In the step two, according to the aqueous rising of producing well history in well group and salt content situation of change, the well is judged
Each oil-extracting well water injection well is shown in that injection water time, detailed process are in group：The historical production data of each oil well in the well group is inquired,
Extraction daily output water, aqueous, salt content, that is, Cl from creation data-Data, using the time as abscissa draw curve, according to oil recovery
Well produces water curve, aqueous curve, Cl-Graphic change calculates each producing well and sees the injection water time, when producing well production water and contain
There is step rising or Cl in water curve-There is step decline in curve, that is, judges that the oil well is shown in injection water, when point of inflexion on a curve
Between be producing well see injection the water time.
In the step one, the creation data includes daily output water, aqueous and salt content, that is, Cl-Data.
In the step three, the i.e. accumulative water filling volume of control volume of the water injection well
V
Control
= V
It is tired
= V
Day notes
×t
1
In formula：V Control For the control volume of the water injection well, m3；
V It is tired For the accumulative water injection rate to the water injection well in the most short water breakthrough time from going into operation certainly, m3；
V Day notes For the water injection well daily water-injection rate, m3；
t 1 For most short water breakthrough time, day.
In the step four, profile control agent design quantity is the 20-30% that water injection well controls volume,
V Profile control = V Control ×（20-30）%
In formula：V Profile control For profile control well design maximum dosage, m3；
V Control For the control volume of the water injection well, m3。
Beneficial effects of the present invention are：
Method provided by the invention, the development of low permeability oil field microcrack, oil well is to exacerbate reservoir with fracturing production
Property.Compared to conventional profile control dosage design method, the present invention calculates profile control dosage, fracture type water breakthrough class according to water filling control volume
Type oil reservoir is more targeted.
The present invention is described in further details below with reference to embodiment.
Specific implementation mode
Embodiment 1：
In order to overcome the problems, such as it is existing time-consuming, flexibility difference is ineffective, the present invention provides a kind of Low-permeability, fractured water breakthrough oil
What Tibetan used determines that method, the scientific and reasonable carry out Amount of profile control agent design of the present invention are maximum for Profile Control in Injection Well agent dosage
The improvement intake profile of limit expands swept volume, to improve the validity of profile control measures.
A kind of Low-permeability, fractured water breakthrough oil reservoir determines method for Profile Control in Injection Well agent dosage, sees injection water using producing well
Time calculates underground and effectively controls volume, and then calculates Amount of profile control agent, specifically includes following steps：
Step 1 determine can profile control water injection well, inquire the water injection well and correspond to all producing well historical production datas；
Step 2 judges each oil recovery in the well group according to the aqueous rising of producing well history in well group and salt content situation of change
Well water injection well is shown in the injection water time；
Step 3 calculates the control volume of the water injection well according to the water breakthrough time for the producing well for seeing injection water in well group at first；
Step 4 profile control agent injects 0.2-0.3 times of water injection rate volume when dosage is oil well water breakthrough.
Low permeability oil field microcrack is developed, and oil well is to exacerbate reservoir heterogeneity with fracturing production.Compared to conventional profile control
Dosage design method, the present invention calculate profile control dosage according to water filling control volume, and fracture type water breakthrough type oil reservoir has more needle
To property.
The present invention improves intake profile, expands wave to greatest extent according to scientific and reasonable carry out Amount of profile control agent design
And volume, to improve the validity of profile control measures.
Embodiment 2：
On the basis of above-described embodiment, in the present embodiment, in the step 1, determination can profile control water injection well specific step
Suddenly it is：
1）The well head pressure depression curve of each well in block is tested；Ensure the work of neighbouring each well in testing time section
Condition does not change, and for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours or more；
2）After the completion of test, the pressure index PI values of each well are calculated；
3）All wells in calculation blockIPIAverage value, selection are less than blockIPIThe water injection well of average value is profile control well, etc.
In or higher than block it is averageIPIThe water injection well of average value is disregarded.
The step 2）In, calculate the PI values of each well：
In formula：
PIFor the pressure index of well, MPa；
PFor the well well head pressure changed with the closed-in time, MPa；
tFor closed-in time, min, for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours.
The step 3）In, all wells in calculation blockIPIAverage value：
In formula：IPIFor the PI values after zero dimension；
k i For reservoir original permeability, μm2；
hFor reservoir effective thickness, m；
qFor the injection rate of water injection well, m3/d；
μFor the fluid viscosity in reservoir, mPas；
PIFor the pressure index of well, MPa.
In the step two, according to the aqueous rising of producing well history in well group and salt content situation of change, the well is judged
Each oil-extracting well water injection well is shown in that injection water time, detailed process are in group：The historical production data of each oil well in the well group is inquired,
Extraction daily output water, aqueous, salt content, that is, Cl from creation data-Data, using the time as abscissa draw curve, according to oil recovery
Well produces water curve, aqueous curve, Cl-Graphic change calculates each producing well and sees the injection water time, when producing well production water and contain
There is step rising or Cl in water curve-There is step decline in curve, that is, judges that the oil well is shown in injection water, when point of inflexion on a curve
Between be producing well see injection the water time.
In the step one, the creation data includes daily output water（Unit is m3）, aqueous and salt content, that is, Cl-（It is single
Position is mg/L）Data.
In the step three, the i.e. accumulative water filling volume of control volume of the water injection well
V
Control
= V
It is tired
= V
Day notes
×t
1
In formula：V Control For the control volume of the water injection well, m3；
V It is tired For the accumulative water injection rate to the water injection well in the most short water breakthrough time from going into operation certainly, m3；
V Day notes For the water injection well daily water-injection rate, m3；
t 1 For most short water breakthrough time, day.
In the step four, profile control agent design quantity is the 20-30% that water injection well controls volume,
V Profile control = V Control ×（20-30）%
In formula：V Profile control For profile control well design maximum dosage, m3；
V Control For the control volume of the water injection well, m3。
In conjunction with the regulating section of oil wells mechanism of action, see that the injection water time calculates underground and effectively controls volume using producing well, in turn
Calculate Amount of profile control agent.It is characterized in that containing following steps：
（1）Profile control water injection well is specified, the water injection well is inquired and corresponds to the aqueous rising of all producing well history and salt content variation.
（2）According to the aqueous rising of producing well history in well group and salt content situation of change, each oil recovery in the well group is judged
Well water injection well is shown in the injection water time.
（3）According to the water breakthrough time for the producing well for seeing injection water in well group at first, the control volume of the water injection well is calculated.
（4）Profile control injects design quantity then and is 0.2-0.3 times of the water injection well control volume.
According to this method, white 205-37 wells profile control agent liquid measure dosage is now specifically given：White 205-37 wells are thrown in May, 2007
Note, well group correspond to the white 206-37 wells of oil well in April, 2008 it is aqueous reach 71% earliest, salt content 16000mg/L, hence it is evident that see
To injection water, it is 0.8063 × 10 to add up water injection rate at this time4m3, inject water management volume and be slightly less than accumulative injection rate, then profile control agent
Dosage 0.2PV=0.2 × 0.8063 × 104≈1600m3.Amount of profile control agent has lacked the requirement that profile control is not achieved, and Amount of profile control agent
The input-output ratio of more oil wells will not be further added by, it is not necessary that waste, input is excessive, and benefit will not rise appreciably, so adjusting
Cuing open 0.2-0.3 times that agent injection design quantity is then the water injection well control volume is economic benefit preferably and profile control effect is also most
Good.
The foregoing examples are only illustrative of the present invention, does not constitute the limitation to protection scope of the present invention, all
Be with the present invention it is same or analogous design all belong to the scope of protection of the present invention within.It is not described in detail in present embodiment
Data and the step category industry well known conventional means, do not describe one by one here.
Claims (8)
1. a kind of Low-permeability, fractured water breakthrough oil reservoir determines method for Profile Control in Injection Well agent dosage, it is characterised in that：Utilize oil recovery
Well is shown in that the injection water time calculates underground and effectively controls volume, and then calculates Amount of profile control agent, specifically includes following steps：
Step 1 determine can profile control water injection well, inquire the water injection well and correspond to all producing well historical production datas；
Step 2 judges each oil recovery in the well group according to the aqueous rising of producing well history in well group and salt content situation of change
Well water injection well is shown in the injection water time；
Step 3 calculates the control volume of the water injection well according to the water breakthrough time for the producing well for seeing injection water in well group at first；
Step 4 profile control agent injects 0.2-0.3 times of water injection rate volume when dosage is oil well water breakthrough.
2. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 1 determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：In the step 1, determination can profile control water injection well the specific steps are：
The well head pressure depression curve of each well in block is tested；Ensure the work item of neighbouring each well in testing time section
Part does not change, and for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours or more；
After the completion of test, the pressure index PI values of each well are calculated；
All wells in calculation blockIPIAverage value, selection are less than blockIPIThe water injection well of average value is profile control well, is equal to
Or it is average higher than blockIPIThe water injection well of average value is disregarded.
3. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 2 determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：The step 2）In, calculate the PI values of each well：
In formula：
PIFor the pressure index of well, MPa；
PFor the well well head pressure changed with the closed-in time, MPa；
tFor closed-in time, min, for Low-permeability, fractured water breakthrough oil reservoir, the closed-in time is 24 hours.
4. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 2 determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：The step 3）In, all wells in calculation blockIPIAverage value：
In formula：IPIFor the PI values after zero dimension；
k i For reservoir original permeability, μm2；
hFor reservoir effective thickness, m；
qFor the injection rate of water injection well, m3/d；
μFor the fluid viscosity in reservoir, mPas；
PIFor the pressure index of well, MPa.
5. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 1 determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：In the step two, according to the aqueous rising of producing well history in well group and salt content situation of change, judging should
Each oil-extracting well water injection well is shown in that injection water time, detailed process are in well group：Inquire the history production number of each oil well in the well group
According to extraction daily output water, aqueous, salt content, that is, Cl from creation data-Data, using the time as abscissa draw curve, according to
Producing well produces water curve, aqueous curve, Cl-Graphic change calculates each producing well and sees the injection water time, when the production water of producing well
And there is step rising or Cl in aqueous curve-There is step decline in curve, that is, judges that the oil well is shown in that injection water, curve turn
The point time is that producing well is shown in the injection water time.
6. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：In the step one, the creation data includes daily output water, aqueous and salt content, that is, Cl-Data.
7. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 1 determines method for Profile Control in Injection Well agent dosage,
It is characterized in that：In the step three, the i.e. accumulative water filling volume of control volume of the water injection well
V
Control
= V
It is tired
= V
Day notes
×t
1
In formula：V Control For the control volume of the water injection well, m3；
V It is tired For the accumulative water injection rate to the water injection well in the most short water breakthrough time from going into operation certainly, m3；
V Day notes For the water injection well daily water-injection rate, m3；
t 1 For most short water breakthrough time, day.
8. a kind of Low-permeability, fractured water breakthrough oil reservoir according to claim 1 is for water injection well
Amount of profile control agent determines method, it is characterised in that：In the step four, profile control agent design quantity is water injection well control volume
Long-pending 20-30%,
V Profile control = V Control ×（20-30）%
In formula：V Profile control For profile control well design maximum dosage, m3；
V Control For the control volume of the water injection well, m3。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494263A (en) * | 2020-04-08 | 2021-10-12 | 中国石油化工股份有限公司 | Method for plugging water channeling crack of tight oil reservoir oil well, volume calculation method and device |
| CN115961923A (en) * | 2021-10-12 | 2023-04-14 | 中国石油天然气股份有限公司 | Deep profile control and flooding method for fractured reservoir |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113494263A (en) * | 2020-04-08 | 2021-10-12 | 中国石油化工股份有限公司 | Method for plugging water channeling crack of tight oil reservoir oil well, volume calculation method and device |
| CN115961923A (en) * | 2021-10-12 | 2023-04-14 | 中国石油天然气股份有限公司 | Deep profile control and flooding method for fractured reservoir |
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Application publication date: 20180928 |