CN108505980A - A kind of underground energy of waterflooding reservoir utilizes level evaluation method - Google Patents
A kind of underground energy of waterflooding reservoir utilizes level evaluation method Download PDFInfo
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- CN108505980A CN108505980A CN201810104131.2A CN201810104131A CN108505980A CN 108505980 A CN108505980 A CN 108505980A CN 201810104131 A CN201810104131 A CN 201810104131A CN 108505980 A CN108505980 A CN 108505980A
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- 238000011156 evaluation Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 238000002347 injection Methods 0.000 claims abstract description 43
- 239000007924 injection Substances 0.000 claims abstract description 43
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 239000013589 supplement Substances 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 20
- 230000010354 integration Effects 0.000 claims abstract description 3
- 235000019198 oils Nutrition 0.000 claims description 61
- 235000019476 oil-water mixture Nutrition 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 12
- 238000004364 calculation method Methods 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 5
- 239000003129 oil well Substances 0.000 claims description 3
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 55
- 238000000605 extraction Methods 0.000 description 12
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000009825 accumulation Methods 0.000 description 3
- 239000011435 rock Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000205 computational method Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000001502 supplementing effect 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
- E21B43/20—Displacing by water
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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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- 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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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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)
- Geophysics (AREA)
- Geophysics And Detection Of Objects (AREA)
Abstract
The invention belongs to oil gas development technology fields, and in particular to utilize level evaluation method to a kind of underground energy of waterflooding reservoir.This method includes：Step 1 obtains producing well parameter, and the fluid energy that producing well produces in certain time is calculated；Step 2 obtains water injection well parameter, and the energy that water filling supplements in certain time is calculated；Step 3 obtains oil deposit parameter, the elastic energy for being stored or being discharged using oil reservoir after integration method calculating water filling；Step 4, the underground energy for calculating waterflooding reservoir utilize level.Evaluation method of the present invention clearly descends the energy utilization in Flow Through Porous Media horizontal, can accurately hold subsurface deposit system energy consumption size, energy utilization obstacle, instruct oil field energy saving to lower consumption.
Description
Technical field
The invention belongs to oil gas development technology fields, and in particular to utilize water to a kind of underground energy of waterflooding reservoir
Flat evaluation method.
Background technology
Water flooding refers to supplementing stratum energy in water injection well artificial recharge, and oil is driven to producing well well by water
Bottom, and by oil well hoisting system by oil-water mixture promoted to ground process.It is consumed during waterflooding extraction a large amount of
Energy generates the benefit that cost directly affects oil field development.The energy utilization for improving oil field is horizontal, to reduce oil field operation at
This, increases economic efficiency and is of crucial importance.
The process of water flooding production includes mainly that water injection well injection, subsurface deposit seepage flow and producing well lift three
Subprocess.The evaluation of energy utilization level lifts two only for water injection well injection, producing well in waterflooding extraction production process at present
The method of a process, evaluation mainly calculates input, output energy and system effectiveness, calculating side by field test data
Method, evaluation index and evaluation method have ripe standard and method.But for being lifted as the injection of connection water injection well and producing well
Rise the subsurface deposit flow event of two parts hinge, the energy being lost in input energy, output energy, flow event, entirety
Energy utilization level etc., calculated and evaluation method there are no specific.
In consideration of it, the present invention proposes that a kind of waterflooding reservoir underground energy utilizes level evaluation method, according to test number
According to dividing artificial recharge exploitation and elastic energy to develop two ways, calculate subsurface deposit seepage flow mistake in waterflooding extraction production process
The energy and energy utilization for inputting, exporting, being lost in journey are horizontal, accurately hold subsurface deposit system energy consumption size, the profit of energy
With situation, enterprise's modified technique, equipment and management, development of latent energy-saving potential are helped, the economic effect of energy utilization is improved.
Invention content
The purpose of the present invention is to solve problems of the existing technology, provide a kind of underground of waterflooding reservoir
Energy utilization level evaluation method.
The purpose of the present invention can be achieved by the following technical measures：
It is the energy exported and input that a kind of underground energy of waterflooding reservoir, which utilizes level evaluation method, evaluation criterion,
Energy ratio, it is main to measure and computational methods, including：
Step 1, the height for obtaining producing well shaft bottom relative datum face, the density of producing well shaft bottom oil water mixture, flow velocity
The volume and quality of Produced Liquid with flowing bottomhole pressure (FBHP) and in certain time, are calculated the stream that producing well produces in certain time
Physical efficiency amount；
Water is injected in step 2, the height for obtaining water injection well shaft bottom relative datum face, the density for injecting water, water injection well shaft bottom
The volume and quality of injection water in flow velocity and flowing bottomhole pressure (FBHP) and certain time are calculated what water filling in certain time supplemented
Energy；
Step 3 obtains in oil reservoir in different time, the volume of the pressure of different location and oil water mixture, uses integral
Method calculates the elastic energy of oil reservoir storage or release after water filling；
Step 4, the underground energy for calculating waterflooding reservoir utilize level.
The purpose of the present invention can be also achieved by the following technical measures：
The underground energy of above-mentioned waterflooding reservoir utilizes level evaluation method, in the certain time described in step 1
The fluid energy of producing well extraction, including potential energy, pressure energy and kinetic energy, shown in calculation formula such as formula (I)：
In formula (I), EoThe fluid energy of producing well extraction in certain time, J；ρ1Producing well shaft bottom oil-water mixture
Density, kg/m3；G- acceleration of gravity, m/s2；z1The height in producing well shaft bottom relative datum face, m；V1Producing well shaft bottom one
It fixes time the volume of interior Produced Liquid, m3；p1Producing well flowing bottomhole pressure (FBHP), Pa；ν1The flow velocity of producing well shaft bottom oil water mixture, m/
s；m1The quality of Produced Liquid, kg in the certain time of producing well shaft bottom.
The energy of water filling supplement in certain time described in step 2, including potential energy, pressure energy and kinetic energy, that is, calculate public
Shown in formula such as formula (II)：
In formula (II), EiThe energy of water filling supplement in certain time, J；ρ2Inject the density of water, kg/m3；G- gravity
Acceleration, m/s2；z2The height in water injection well shaft bottom relative datum face, m；V2The body of injection water in the certain time of water injection well shaft bottom
Product, m3；p2Water injection well flowing bottomhole pressure (FBHP), Pa；ν2The flow velocity of water, m/s are injected in water injection well shaft bottom；m2Water injection well shaft bottom certain time
The quality of interior injection water, kg.
The elastic energy of oil reservoir storage or release after water filling described in step 3, elastic energy are since bullet occurs for object
Property deformation and the energy that stores or discharge, oil, water and Rock Matrix are all micro- compressible in oil reservoir, under the effect of external force
It deforms upon, to store or discharge elastic energy.The cubic deformation of oil, water and Rock Matrix finally can all embody in oil reservoir
For the volume change of fluid in oil reservoir；When oil, water volume are shunk, reservoir pressure increases, and stores energy；When oil, water volume are swollen
When swollen, reservoir pressure declines, and releases energy, and according to the variation of fluid volume in oil reservoir and pressure, oil reservoir stores after calculating water filling
Or the elastic energy of release, shown in calculation formula such as formula (III)：
In formula (III), using water injection well as coordinate origin, the time for starting water filling is set to start time, t=0 by x=0；
Oil reservoir range is integrated；EeThe elastic energy of oil reservoir storage or release, J after water filling；px,tThe time is t, position in oil reservoir
For the pressure at x, Pa；Vx,0The time is 0 in oil reservoir, and position is the fluid volume at x, m3；Vx,tThe time is t, position in oil reservoir
The fluid volume being set at x, m3。
The underground energy of calculating waterflooding reservoir described in step 4 is using level, when needing artificial recharge, for
Artificial recharge supplements the process of energy exploitation, oil reservoir is regarded to the system of an entirety as, then water injection well provides energy for development process
Amount, be system input energy, producing well extraction energy be system output energy, and oil reservoir storage elastic energy be by
The energy of system change after energy loss is stored in elastic energy in oil reservoir and is finally adopted by producing well so during this
The energy gone out belongs to the useful work of this process；Therefore, the development process of energy is supplemented for artificial recharge, producing well extraction
Energy and oil reservoir elastic energy and divided by the energy of water filling supplement be exactly subsurface deposit seepage flow mistake when artificial recharge supplements energy
The system effectiveness of journey, shown in calculation formula such as formula (IV)：
Artificial recharge supplements energy, and more special situation is only water filling, but is not recovered the oil, i.e. water filling supplements energy to make
The process that strata pressure constantly rises, at this point, there is no the output of energy in system, therefore the only surplus stratum elastic energy of useful work
Storage；Then in system effectiveness expression formula, the energy of producing well output is 0, and simplification obtains formula (VI)：
The underground energy of calculating waterflooding reservoir described in step 4 is using level, when without artificial recharge, centainly
The energy of water filling supplement in time is 0, belongs to elastic energy exploitation, and oil field development is former by the way of elastic energy exploitation
Oil is driven by the elastic energy of fluid in oil reservoir and rock, and the elastic energy of oil reservoir provides energy for development process, is to be
The energy of system input.The energy of producing well output is the energy of system output, that is, the useful work of system；Therefore, for oil
Hide the process of elastic energy exploitation, the underground when energy of producing well extraction divided by the elastic energy of oil reservoir are exactly elastic energy exploitation
The system effectiveness of Flow Through Porous Media, shown in calculation formula such as formula (V)：
The invention has the characteristics that：
Underground energy utilizes level evaluation method during the oil reservoir development that the present invention establishes, according to hydrodynamics energy
Characterization and conversion, measuring and calculating show that the energy (energy of water filling supplement) inputted in subsurface deposit flow event, the energy of output (are adopted
Oil well produced energy), oil reservoir storage or release energy and flow event in energy consumption system effectiveness, specify subsurface deposit
Energy utilization in flow event is horizontal, can accurately hold subsurface deposit system energy consumption size, energy utilization obstacle, guidance
Oil field energy saving lowers consumption.
Description of the drawings
Fig. 1 is that the underground energy of waterflooding reservoir of the embodiment of the present invention utilizes the particular flow sheet of level evaluation method；
Fig. 2 is the relational graph of the fluid energy that producing well produces in the embodiment of the present invention, the energy and time of accumulative extraction；
Fig. 3 is the relational graph of the energy that water filling supplements in the embodiment of the present invention, the energy and time of accumulative supplement；
Fig. 4 is the relational graph of the energy that oil reservoir stores in the embodiment of the present invention, the energy and time of accumulative storage；
Fig. 5 is the underground energy of waterflooding reservoir in the embodiment of the present invention using horizontal, i.e. system effectiveness and time
Relational graph.
Specific implementation mode
For enable the present invention above and other objects, features and advantages be clearer and more comprehensible, it is cited below particularly go out preferable implementation
Example, and coordinate attached drawing, it is described in detail below.
Embodiment
With numerical simulation means, the one-dimensional typical case that the note one only comprising a bite water injection well, a bite producing well is adopted is established
Model, including 11 grids, sizing grid is 30m × 10m × 5m, depth 2000m in oil reservoir, porosity 0.28, permeability 1800
×10-3um2, stratum viscosity 24mPas, initial oil saturation 0.7, fluid production rate 15%, measures and statistical correlation oil reservoir is joined
Number, illustrates underground energy consumption characterizing method during oil reservoir development；The present embodiment uses water flooding recovery, the underground of waterflooding reservoir
Energy utilization level evaluation method includes：Step such as Fig. 1 shows：
Step 101, the energy of producing well extraction is calculated, the height in producing well shaft bottom relative datum face is obtained, reference plane takes
Deep in oil reservoir, i.e., height is 0, the density 995Kg/m of producing well shaft bottom oil water mixture3, flow velocity be 0.4m/s and shaft bottom stream
Pressure is the volume (0.95m3/d, total 84.9m3) and quality (84475Kg) of Produced Liquid in 19.85MPa and 90 day, using public affairs
The fluid energy of producing well produces in 90 days fluid energy and accumulative extraction is calculated in formula (I)；
In formula (I), EoThe fluid energy of producing well extraction in certain time, J；ρ1Producing well shaft bottom oil-water mixture
Density, kg/m3；G- acceleration of gravity, m/s2；z1The height in producing well shaft bottom relative datum face, m；V1Producing well shaft bottom one
It fixes time the volume of interior Produced Liquid, m3；p1Producing well flowing bottomhole pressure (FBHP), Pa；ν1The flow velocity of producing well shaft bottom oil water mixture, m/
s；m1The quality of Produced Liquid, kg in the certain time of producing well shaft bottom.After water filling 90 days, the energy of accumulation output in 90 days is calculated
Amount is the number that 1664578971J, i.e. 462.38Kwh, and Fig. 2 give output energy in the 1-86 days periods of producing well
Value.
Step 103, the energy of water injection well supplement is calculated, the height in water injection well well shaft bottom relative datum face, reference plane are obtained
It taking in oil reservoir deeply, i.e., height is 0, the flow velocity of water injection well shaft bottom injection water is 0.44m/s and flowing bottomhole pressure (FBHP) is 20.85MPa, with
And the volume (1.05m3/d, total 94.5m3) and quality (94500kg) of water are injected in 90 days, it is calculated 90 using formula (II)
The energy of the energy that water filling supplements in it and accumulative supplement, specifically as shown in Figure 3；
In formula (II), EiThe energy of water filling supplement in certain time, J；ρ2Producing well shaft bottom oil-water mixture it is close
Degree, kg/m3；G- acceleration of gravity, m/s2；z2The height in producing well shaft bottom relative datum face, m；V2One timing of water injection well shaft bottom
The volume of interior injection water, m3；p2Water injection well flowing bottomhole pressure (FBHP), Pa；ν2The flow velocity of water, m/s are injected in water injection well shaft bottom；m2Water filling
The quality of injection water, kg in the certain time of well shaft bottom.The energy of accumulation input in 90 days, the i.e. energy of water injection well supplement is calculated
For 2419496408J, i.e. 672.1Kwt, and Fig. 2 gives the numerical value of input energy in the 1-86 days periods of water injection well.
Step 105, after stablizing water filling 90 days, the average pressure of oil reservoir rises 10.2MPa, stores elastic energy, oil reservoir
By compression fluid volume, increase pore volume elastic energy is stored in 9.5 side of underground water altogether.Calculate using formula (III)
The elastic energy of accumulation storage in 90 days is 237354520J, i.e. 65.9Kwt.It obtains in oil reservoir the time is t, position is at x
Pressure and oil water mixture volume, using integration method calculate water filling after oil reservoir store or release elastic energy, wherein oil
Hide 1-86 days specific data as shown in Figure 4；
In formula (III), using water injection well as coordinate origin, the time for starting water filling is set to start time, t=0 by x=0；
Oil reservoir range is integrated；EeThe elastic energy of oil reservoir storage or release, J after water filling；px,tThe time is t, position in oil reservoir
For the pressure at x, Pa；Vx,0The time is 0 in oil reservoir, and position is the fluid volume at x, m3；Vx,tThe time is t, position in oil reservoir
The fluid volume being set at x, m3。
In step 107 in Fig. 1 calculate subsurface deposit flow event in system effectiveness, Fig. 5 give system effectiveness and when
Between relational graph；
Shown in calculation formula such as formula (IV)：
Using formula (IV) be calculated oil reservoir during this of the invention oil reservoir underground percolation it is 90 days accumulative after system imitate
Rate average out to 78.6%.
Claims (6)
1. a kind of underground energy of waterflooding reservoir utilizes level evaluation method, which is characterized in that including：
Step 1, the height for obtaining producing well shaft bottom relative datum face, density, flow velocity and the well of producing well shaft bottom oil water mixture
Underflow pressure and in certain time Produced Liquid volume and quality, the fluid energy that producing well in certain time produces is calculated
Amount；
The flow velocity of water is injected in step 2, the height for obtaining water injection well shaft bottom relative datum face, the density for injecting water, water injection well shaft bottom
With the volume and quality of injection water in flowing bottomhole pressure (FBHP) and certain time, the energy that water filling supplements in certain time is calculated；
Step 3 obtains in oil reservoir in different time, the volume of the pressure of different location and oil water mixture, uses integration method meter
The elastic energy of oil reservoir storage or release after calculation water filling；
Step 4, the underground energy for calculating waterflooding reservoir utilize level.
2. the underground energy of waterflooding reservoir according to claim 1 utilizes level evaluation method, which is characterized in that step
Shown in the calculation formula such as formula (I) for the fluid energy that producing well produces in certain time described in rapid 1：
In formula (I), EoThe fluid energy that producing well produces in certain time, J；ρ1The density of producing well shaft bottom oil-water mixture,
kg/m3；G- acceleration of gravity, m/s2；z1The height in producing well shaft bottom relative datum face, m；V1Producing well shaft bottom certain time
The volume of interior Produced Liquid, m3；p1Producing well flowing bottomhole pressure (FBHP), Pa；ν1The flow velocity of producing well shaft bottom oil water mixture, m/s；m1It adopts
The quality of Produced Liquid, kg in the certain time of oil well shaft bottom.
3. the underground energy of waterflooding reservoir according to claim 1 utilizes level evaluation method, which is characterized in that step
Shown in the energy balane formula such as formula (II) of water filling supplement in certain time described in rapid 2：
In formula (II), EiThe energy of water filling supplement in certain time, J；ρ2Inject the density of water, kg/m3；G- gravity accelerates
Degree, m/s2；z2The height in water injection well shaft bottom relative datum face, m；V2The volume of injection water in the certain time of water injection well shaft bottom,
m3；p2Water injection well flowing bottomhole pressure (FBHP), Pa；ν2The flow velocity of water, m/s are injected in water injection well shaft bottom；m2In the certain time of water injection well shaft bottom
Inject the quality of water, kg.
4. the underground energy of waterflooding reservoir according to claim 1 utilizes level evaluation method, which is characterized in that step
After water filling described in rapid 3 shown in the calculation formula such as formula (III) of the elastic energy of oil reservoir storage or release：
In formula (III), using water injection well as coordinate origin, the time for starting water filling is set to start time, t=0 by x=0；EeNote
The elastic energy of oil reservoir storage or release, J after water；px,tThe time is t in oil reservoir, and position is the pressure at x, Pa；Vx,0Oil reservoir
The middle time is 0, and position is the fluid volume at x, m3；Vx,tThe time is t in oil reservoir, and position is the fluid volume at x, m3。
5. the underground energy of waterflooding reservoir according to claim 1 utilizes level evaluation method, which is characterized in that step
The underground energy of calculating waterflooding reservoir described in rapid 4 utilizes level, when needing artificial recharge, calculation formula such as formula
(IV) shown in：
6. the underground energy of waterflooding reservoir according to claim 1 utilizes level evaluation method, which is characterized in that step
The underground energy of calculating waterflooding reservoir described in rapid 4 utilizes level, when without artificial recharge, the note in certain time
The energy of water supplement is 0, shown in calculation formula such as formula (V)：
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110188996A (en) * | 2019-05-06 | 2019-08-30 | 中国石油化工股份有限公司 | Water-drive pool energy consumption-yield-benefit integration characterizing method |
| CN113969768A (en) * | 2020-07-23 | 2022-01-25 | 中国石油化工股份有限公司 | Directional enabling-differential releasing type volume water drive method for one-injection multi-production well group |
| CN113969768B (en) * | 2020-07-23 | 2024-05-31 | 中国石油化工股份有限公司 | Directional energization-differential release type volume water flooding method for one-injection multi-production well group |
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| US20120122740A1 (en) * | 2010-11-12 | 2012-05-17 | Instituto Mexicano Del Petroleo | Heavy oil recovery process using extremophile anaerobic indigenous microorganisms |
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| US20120122740A1 (en) * | 2010-11-12 | 2012-05-17 | Instituto Mexicano Del Petroleo | Heavy oil recovery process using extremophile anaerobic indigenous microorganisms |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110188996A (en) * | 2019-05-06 | 2019-08-30 | 中国石油化工股份有限公司 | Water-drive pool energy consumption-yield-benefit integration characterizing method |
| CN110188996B (en) * | 2019-05-06 | 2021-08-20 | 中国石油化工股份有限公司 | Energy consumption-yield-benefit integrated characterization method for water-drive reservoir |
| CN113969768A (en) * | 2020-07-23 | 2022-01-25 | 中国石油化工股份有限公司 | Directional enabling-differential releasing type volume water drive method for one-injection multi-production well group |
| CN113969768B (en) * | 2020-07-23 | 2024-05-31 | 中国石油化工股份有限公司 | Directional energization-differential release type volume water flooding method for one-injection multi-production well group |
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| CN108505980B (en) | 2020-07-14 |
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