CN107346518A - The acquisition methods of fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient - Google Patents
The acquisition methods of fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient Download PDFInfo
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 83
- 238000000034 method Methods 0.000 title claims abstract description 30
- 230000005514 two-phase flow Effects 0.000 title claims abstract description 21
- 239000011435 rock Substances 0.000 claims abstract description 36
- 238000006073 displacement reaction Methods 0.000 claims abstract description 32
- 230000035699 permeability Effects 0.000 claims abstract description 27
- 239000008346 aqueous phase Substances 0.000 claims description 25
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- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
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- 238000004088 simulation Methods 0.000 claims description 7
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- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000005325 percolation Methods 0.000 claims description 4
- 238000002242 deionisation method Methods 0.000 claims description 3
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Abstract
The present invention provides a kind of acquisition methods of fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient, and the acquisition methods of the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient include：Step 1, steady state pressure gradient-discharge relation is measured, draws the relation curve of oil, water displacement pressure gradient and flow respectively；Step 2, empirical curve is fitted, obtains the non-linear seepage parameters of oil, water two-phase respectively；Step 3, using the oil of acquisition, water two-phase non-linear seepage parameters, water saturation numerical value corresponding to maximum filtrational resistance gradient is calculated；Step 4, using water saturation numerical value corresponding to maximum filtrational resistance gradient, the maximum filtrational resistance gradient of rock core is calculated.The acquisition methods of the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient can be in quantitatively characterizing waterflood development of low-permeability reservoirs maximum filtrational resistance, laid the foundation for reasonable, the effective exploitation of LOW PERMEABILITY RESERVOIR.
Description
Technical field
The present invention relates to seepage flow characteristics of the underground fluids such as oil, natural gas in LOW PERMEABILITY POROUS MEDIA and
Reservoir Development is studied, and especially relates to a kind of fine and close low-permeability oil deposit oil-water two-phase flow maximum seepage flow resistance
The acquisition methods of power gradient.
Background technology
Fine and close low-permeability oil deposit has, smaller pore throat thinner than in general low-permeability oil deposit, and fluid is oozing
Filtrational resistance influences bigger during stream, there is " tapered off with necessarily injecting pressure water flooding process,
Only being improved injection pressure water flooding process could continue to carry out " and " note does not enter, can not adopted " phenomenon,
Low-permeability oil deposit effective exploitation is had a strong impact on, there is presently no a kind of effective method to obtain low-permeability oil
The maximum filtrational resistance of Tibetan.Therefore, obtained we have invented a kind of seepage parameters by rock core fine and close low
The method of oil reservoir oil-water two-phase flow maximum filtrational resistance gradient is permeated, so as to solve above-mentioned problem.
The content of the invention
It can be quantified it is an object of the invention to provide one kind and calculate low permeability reservoir maximum filtrational resistance gradient, be
The fine and close low-permeability oil deposit oil-water two-phase flow maximum seepage flow that reasonable, the effective exploitation of LOW PERMEABILITY RESERVOIR lay the foundation
The acquisition methods of resistance gradient.
The purpose of the present invention can be achieved by the following technical measures：Fine and close low-permeability oil deposit oil-water two-phase flow
The acquisition methods of maximum filtrational resistance gradient, the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance
The acquisition methods of gradient include：Step 1, measure steady state pressure gradient-discharge relation, draw respectively oil,
The relation curve of water displacement pressure gradient and flow；Step 2, empirical curve is fitted, obtains oil, water two
Mutually non-linear seepage parameters respectively；Step 3, using the oil of acquisition, water two-phase non-linear seepage parameters,
Calculate water saturation numerical value corresponding to maximum filtrational resistance gradient；Step 4, using maximum filtrational resistance
Water saturation numerical value corresponding to gradient, calculate the maximum filtrational resistance gradient of rock core.
The purpose of the present invention can be also achieved by the following technical measures：
In step 1, rock core is dried into saturation degree deionized water, with the profit volume ratio bar of a certain fixation
Under part, injected with different displacement pressures, until reaching steady-flow, with Multifunctional core displacement
Measurement device steady state pressure gradient-discharge relation, record under different displacement pressure differences oil respectively, water pass through it is low
The percolation flow velocity of rock core is permeated, the pass of oil, water displacement pressure gradient and flow is drawn in same coordinate diagram
It is curve.
In step 2, aqueous phase displacement pressure gradient and discharge relation curve are fitted using formula (1), obtained
Obtain aqueous phase non-linear seepage parameters δw、cw：
In formula, QwFor the flow under aqueous phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μwTo go
The viscosity of ionized water, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δwFor deionization
Water seepage flow nonlinear factor, dimensionless；cwFor deionized water seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
In step 2, oil phase displacement pressure gradient and discharge relation curve are fitted using formula (2), obtained
Obtain oil phase non-linear seepage parameters δo、co：
In formula, QoFor the flow under oil phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μoFor mould
Intend the viscosity of oil, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δoOozed for simulation oil
Flow nonlinear factor, dimensionless；coFor simulation oil seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
In step 3, according to the basic of the oil of acquisition, aqueous phase seepage parameters respectively and rock core and fluid
These data of parameter, water saturation number corresponding to maximum filtrational resistance gradient is calculated using formula (3)
Value, calculation formula are
In formula, krwFor aqueous phase relative permeability, decimal；swFor water saturation；fwFor containing under different water cut saturation degree
Water rate, decimal；In formula (3), it can obtain as ξ=0 and contain corresponding to maximum filtrational resistance gradient
Water saturation numerical value, formula (3) obtain approximation by given different saturation value by trial and error procedure
Value.
In step 4, the water saturation numerical value according to corresponding to maximum filtrational resistance gradient, calculate maximum
Filtrational resistance gradient, calculation formula are
In formula, λpmaxFor maximum filtrational resistance gradient, MPa/m；μwFor the viscosity of deionized water, mPa/s；A is rock
Heart cross-sectional area, cm2；k0For rock core absolute permeability, mD；krwFor aqueous phase relative permeability, decimal；fwFor different water cut
Moisture content under saturation degree, decimal；δwFor aqueous phase seepage flow nonlinear factor, dimensionless；cwFor aqueous phase seepage flow nonlinear system
Number, m/MPa-1；Δ p is displacement pressure, MPa；L is seepage flow length, m；qinjFor fluid injection rate, ml/s..
The acquisition methods of fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient in the present invention,
It is that the seepage flow characteristics and oil-gas reservoir of the underground fluid in LOW PERMEABILITY POROUS MEDIA such as research oil, natural gas are opened
The important research method of hair.With the needs of raising and the national economic development of oilfield exploitation technological level,
The oil contained in hyposmosis even fine and close low permeability reservoir has commercial mining value, gets Reservoir Seepage clear
The distribution characteristics of resistance, theoretical foundation is established for effective waterflooding extraction of compact oil reservoir.This method is built
Stand to quantify and calculated low permeability reservoir maximum filtrational resistance gradient, opened to improve this LOW PERMEABILITY RESERVOIR oil field
Hair effect lays the foundation.Asking for maximum filtrational resistance gradient be present for fine and close low-permeability oil deposit in this method
Topic, from quantitative study flow in low permeability core oil-water two-phase flow rule, oozes using fine and close low-permeability oil deposit
Theoretical model fitting percolation curve is flowed, is obtaining the basis of the non-linear seepage parameters of oil, water two-phase respectively
On, water saturation numerical value corresponding to maximum filtrational resistance gradient is calculated, utilizes the water saturation numerical value
Calculate the maximum filtrational resistance gradient during waterflood development of low-permeability reservoirs.
Brief description of the drawings
Fig. 1 is the acquisition side of the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient of the present invention
The flow chart of one specific embodiment of method.
Embodiment
For enable the present invention above and other objects, features and advantages become apparent, it is cited below particularly go out
Preferred embodiment, and coordinate shown in accompanying drawing, it is described in detail below.
As shown in figure 1, Fig. 1 is the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance ladder of the present invention
The flow chart of the acquisition methods of degree.
In a step 101, rock core is dried into saturation degree deionized water, with the profit volume ratio of a certain fixation
Under the conditions of, injected with different displacement pressures, until reaching steady-flow, driven with Multifunctional core
For measurement device steady state pressure gradient-discharge relation, oil, water under different displacement pressure differences are recorded respectively and is passed through
The percolation flow velocity of flow in low permeability core, oil, water displacement pressure gradient and flow are drawn in same coordinate diagram
Relation curve；Oil, the aqueous phase relative permeability numerical value under different water cut are calculated using JBN methods, and
Calculate the aqueous rate score under different water cut saturation degree；
In a step 102, aqueous phase displacement pressure ladder obtained in step 101 is fitted within using formula (1)
Degree and discharge relation curve, obtain aqueous phase non-linear seepage parameters δw、cw；
In formula, QwFor the flow under aqueous phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μwFor deionization
The viscosity of water, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δwOozed for deionized water
Flow nonlinear factor, dimensionless；cwFor deionized water seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
It is bent that oil phase displacement pressure gradient and discharge relation obtained in step 101 are fitted within using formula (2)
Line, obtain oil phase non-linear seepage parameters δo、co。
In formula, QoFor the flow under oil phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μoFor simulation oil
Viscosity, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δoIt is non-for simulation oil seepage flow
Linear coefficient, dimensionless；coFor simulation oil seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
In step 103, according to the oil of acquisition, the seepage parameters and the base of rock core and fluid of aqueous phase respectively
The data such as this parameter, water saturation number corresponding to maximum filtrational resistance gradient is calculated using formula (3)
Value, calculation formula are
In formula (3), it can be obtained as ξ=0 and contain water saturation corresponding to maximum filtrational resistance gradient
Number of degrees value swpmax.Formula (3) is only capable of, by given different saturation value, approximation being obtained by trial and error procedure
Value.
In formula, krwFor aqueous phase relative permeability, decimal；swFor water saturation；fwSatisfy for different water cut
With the moisture content under degree, decimal.
It is corresponding according to the maximum filtrational resistance gradient on the rock core yardstick obtained in step 103 in step 104
Water saturation numerical value after, calculate on oil reservoir yardstick maximum filtrational resistance ladder under the conditions of different injection amount
Degree, calculation formula are
In formula, λpmaxFor maximum filtrational resistance gradient, MPa/m；μwFor the viscosity of deionized water, mPa/s；A is rock
Heart cross-sectional area, cm2；k0For rock core absolute permeability, mD；krwFor aqueous phase relative permeability, decimal；fwFor different water cut
Moisture content under saturation degree, decimal；δwFor aqueous phase seepage flow nonlinear factor, dimensionless；cwFor aqueous phase seepage flow nonlinear system
Number, m/MPa-1；Δ p is displacement pressure, MPa；L is seepage flow length, m；qinjFor fluid injection rate, ml/s.
Flow terminates.
Claims (6)
1. the acquisition methods of fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient, its feature exist
In the acquisition methods of the fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient include：
Step 1, steady state pressure gradient-discharge relation is measured, draws oil, water displacement pressure gradient respectively
With the relation curve of flow；
Step 2, empirical curve is fitted, obtains the non-linear seepage parameters of oil, water two-phase respectively；
Step 3, using the oil of acquisition, water two-phase non-linear seepage parameters, maximum filtrational resistance ladder is calculated
Water saturation numerical value corresponding to degree；
Step 4, using water saturation numerical value corresponding to maximum filtrational resistance gradient, rock core is calculated most
Big filtrational resistance gradient.
2. fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient according to claim 1
Acquisition methods, it is characterised in that in step 1, by rock core dry saturation degree deionized water, with certain
Under the conditions of the one profit volume ratio fixed, injected with different displacement pressures, until reaching steady-state flow
It is dynamic, steady state pressure gradient-discharge relation is measured with Multifunctional core driving device, records different drives respectively
, by the percolation flow velocity of flow in low permeability core, oil, water drive are drawn in same coordinate diagram for oil, water under pressure difference
For barometric gradient and the relation curve of flow.
3. fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient according to claim 1
Acquisition methods, it is characterised in that in step 2, aqueous phase displacement pressure ladder is fitted using formula (1)
Degree and discharge relation curve, obtain aqueous phase non-linear seepage parameters δw、cw：
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In formula, QwFor the flow under aqueous phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μwTo go
The viscosity of ionized water, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δwFor deionization
Water seepage flow nonlinear factor, dimensionless；cwFor deionized water seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
4. fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient according to claim 1
Acquisition methods, it is characterised in that in step 2, oil phase displacement pressure ladder is fitted using formula (2)
Degree and discharge relation curve, obtain oil phase non-linear seepage parameters δo、co：
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In formula, QoFor the flow under oil phase difference displacement pressure gradient, ml/s；Δ p is displacement pressure, MPa；μoFor mould
Intend the viscosity of oil, mPa/s；A is rock core cross-sectional area, cm2；k0For rock core absolute permeability, mD；δoOozed for simulation oil
Flow nonlinear factor, dimensionless；coFor simulation oil seepage flow nonlinear factor, m/MPa-1；L is rock core length, cm.
5. fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient according to claim 1
Acquisition methods, it is characterised in that in step 3, according to the oil of acquisition, aqueous phase respectively seepage flow join
Number and the basic parameter of rock core and fluid these data, maximum filtrational resistance ladder is calculated using formula (3)
Water saturation numerical value corresponding to degree, calculation formula are
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In formula, krwFor aqueous phase relative permeability, decimal；swFor water saturation；fwFor containing under different water cut saturation degree
Water rate, decimal；In formula (3), it can obtain as ξ=0 and contain corresponding to maximum filtrational resistance gradient
Water saturation numerical value, formula (3) obtain approximation by given different saturation value by trial and error procedure
Value.
6. fine and close low-permeability oil deposit oil-water two-phase flow maximum filtrational resistance gradient according to claim 1
Acquisition methods, it is characterised in that it is in step 4, aqueous according to corresponding to maximum filtrational resistance gradient
Saturation value, calculates maximum filtrational resistance gradient, and calculation formula is
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In formula, λpmaxFor maximum filtrational resistance gradient, MPa/m；μwFor the viscosity of deionized water, mPa/s；A is that rock core is transversal
Area, cm2；k0For rock core absolute permeability, mD；krwFor aqueous phase relative permeability, decimal；fwFor different water cut saturation degree
Under moisture content, decimal；δwFor aqueous phase seepage flow nonlinear factor, dimensionless；cwFor aqueous phase seepage flow nonlinear factor, m/MPa-1；
Δ p is displacement pressure, MPa；L is seepage flow length, m；qinjFor fluid injection rate, ml/s.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108489878A (en) * | 2018-02-06 | 2018-09-04 | 中国石油大学(华东) | A kind of phase percolation curve bearing calibration based on numerical simulation iteration elimination end effect |
| CN108487904A (en) * | 2018-02-06 | 2018-09-04 | 中国石油大学(华东) | A kind of phase percolation curve bearing calibration of the elimination end effect based on plate |
| CN108804750A (en) * | 2018-04-19 | 2018-11-13 | 中国石油化工股份有限公司 | The acquisition methods of trivector permeability suitable for reservoir numerical simulation |
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| CN112163379A (en) * | 2020-09-21 | 2021-01-01 | 西南石油大学 | Unsteady two-phase relative permeability calculation method based on pore network model |
| CN112685970A (en) * | 2020-12-25 | 2021-04-20 | 中国石油大学(华东) | Quantitative characterization method and system for seepage interface of flow unit of water-drive reservoir |
| CN113554259A (en) * | 2020-04-26 | 2021-10-26 | 中国石油化工股份有限公司 | Seepage resistance and displacement pressure double-field matching optimization evaluation method |
| CN113898331A (en) * | 2020-06-22 | 2022-01-07 | 中国石油化工股份有限公司 | Well spacing optimization method for oil reservoir balanced displacement differentiation in high water cut period |
| CN113898338A (en) * | 2021-10-26 | 2022-01-07 | 北京科技大学 | Unconventional gas reservoir starting pressure gradient determination method and device |
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| CN109387467A (en) * | 2017-08-07 | 2019-02-26 | 中国石油化工股份有限公司 | The method for rapidly testing of the comprehensive starting pressure gradient of grease |
| CN109387467B (en) * | 2017-08-07 | 2021-05-14 | 中国石油化工股份有限公司 | Rapid testing method for oil-water comprehensive starting pressure gradient |
| CN108489878A (en) * | 2018-02-06 | 2018-09-04 | 中国石油大学(华东) | A kind of phase percolation curve bearing calibration based on numerical simulation iteration elimination end effect |
| CN108487904A (en) * | 2018-02-06 | 2018-09-04 | 中国石油大学(华东) | A kind of phase percolation curve bearing calibration of the elimination end effect based on plate |
| CN108804750A (en) * | 2018-04-19 | 2018-11-13 | 中国石油化工股份有限公司 | The acquisition methods of trivector permeability suitable for reservoir numerical simulation |
| CN108804750B (en) * | 2018-04-19 | 2021-11-12 | 中国石油化工股份有限公司 | Three-dimensional vector permeability obtaining method suitable for numerical reservoir simulation |
| CN109339774A (en) * | 2018-10-18 | 2019-02-15 | 中国石油化工股份有限公司 | Low permeability deformation non linear fluid flow through porous medium method for numerical simulation based on boundary layer |
| CN109342287A (en) * | 2018-10-25 | 2019-02-15 | 中国石油天然气股份有限公司 | A kind of determination method of air water stable percolation |
| CN110598167A (en) * | 2019-10-11 | 2019-12-20 | 中国石油化工股份有限公司 | Processing method of oil-water relative permeability experimental data of low-permeability reservoir |
| CN110598167B (en) * | 2019-10-11 | 2022-10-28 | 中国石油化工股份有限公司 | Processing method of oil-water relative permeability experimental data of low-permeability reservoir |
| CN113554259B (en) * | 2020-04-26 | 2024-04-16 | 中国石油化工股份有限公司 | Seepage resistance and displacement pressure double-field matching optimization evaluation method |
| CN113554259A (en) * | 2020-04-26 | 2021-10-26 | 中国石油化工股份有限公司 | Seepage resistance and displacement pressure double-field matching optimization evaluation method |
| CN113898331A (en) * | 2020-06-22 | 2022-01-07 | 中国石油化工股份有限公司 | Well spacing optimization method for oil reservoir balanced displacement differentiation in high water cut period |
| CN112163379A (en) * | 2020-09-21 | 2021-01-01 | 西南石油大学 | Unsteady two-phase relative permeability calculation method based on pore network model |
| CN112685970B (en) * | 2020-12-25 | 2022-08-30 | 中国石油大学(华东) | Quantitative characterization method and system for seepage interface of flow unit of water-drive reservoir |
| CN112685970A (en) * | 2020-12-25 | 2021-04-20 | 中国石油大学(华东) | Quantitative characterization method and system for seepage interface of flow unit of water-drive reservoir |
| CN113898338A (en) * | 2021-10-26 | 2022-01-07 | 北京科技大学 | Unconventional gas reservoir starting pressure gradient determination method and device |
| CN113898338B (en) * | 2021-10-26 | 2022-04-05 | 北京科技大学 | Unconventional gas reservoir starting pressure gradient determination method and device |
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