CN109558963A - A kind of water-drive pool High water cut reservoir remaining oil distribution forecast method - Google Patents
A kind of water-drive pool High water cut reservoir remaining oil distribution forecast method Download PDFInfo
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Abstract
The present invention relates to a kind of water-drive pool High water cut reservoir remaining oil distribution forecast methods, belong to oil field development technical field.Characteristic parameter needed for the present invention determines characterization remaining oil distribution according to reservoir geology research data first, then establishes the transport model of oil gas in oil reservoir High water cut reservoir according to identified characteristic parameter；Finally determine that inner ring closes the oil gas quantity of middle aggregation during oil well stops production according to the transport model established.The present invention has fully considered the effect of gravity, can Accurate Prediction go out water-drive pool High water cut reservoir remaining oil distribution situation, it being capable of the effective forming process and enrichment positions of assay Water Flooding Layer remaining oil under the effect of gravity, it instructs Water Flooding Layer remaining oil to tap the latent power again, further improves oil recovery.
Description
Technical field
The present invention relates to a kind of water-drive pool High water cut reservoir remaining oil distribution forecast methods, belong to oil field development technology neck
Domain.
Background technique
80% or more China's oil yield originates from waterflooding oil field, and water filling is the important of oil extraction in oil field and is main side
Formula.Over time, water flooding gradually gos deep into, and domestic many oil fields have entered High water cut, ultra-high water-containing recovers the oil
Phase.The oil field development in this stage is mainly shown as that comprehensive water cut is high, recovery percent of reserves is high, reserve-production ratio is low, recovery ratio is low, averagely adopts
Yield is less than 35%, that is to say, that the more remaining oil of underground still preservation, these remaining oils not being plucked out of are for increasing yield
It is a huge potentiality with recovery ratio is improved, therefore, the formation and enrichment method for researching and analysing remaining oil receive significant attention.
Utilize seismic technology, well logging, core analysis, tracer test, development geology method, reservoir engineering comprehensive analysis
A variety of methods such as method, reservoir numerical simulation method can determine the distribution situation of remaining oil, at present common oil reservoir in field practice
There are mainly three types of remaining oil research technology methods: first is that grinding according to macroscopical remaining oil that oil-water well note adopts situation and monitoring materials is qualitative
Study carefully, this method is mainly that the Surveillance on Haemorrhagic interlayer potentiality during reservoir waterflooding are utilized on the basis of reservoir study
Potentiality position on layer and plane, the method evaluation remaining oil distribution are not easy accurately to determine Identification of The Potentiality of Remaining Oil；Second is that with
The semidefinite quantity research of reservoir engineering analysis by synthesis method, it is micro- that this method mainly establishes not synsedimentary according to rock core flood pot test data
Mutually or the relationship plate of the Injection volume of different permeability rank reservoir and moisture content, in layering batch dispensing water and quantum of output
On the basis of determine that flow unit note adopts moisture content size in net block, and draw the aqueous classification figure of each substratum to determine that oil reservoir is current
Remaining oil distribution situation, the method evaluation remaining oil distribution situation be using infuse adopt net block as unit, specific to a certain specific position
The moisture content set is not easy to determine；Third is that carrying out the residual oil quantitative research of reservoir numerical simulation, numerical reservoir mould using computer
Quasi- is using the technology of heterogeneous fluid percolation law in numerical computation method Researching Oil-gas, its applied mathematical model passes through fluid
The method of mechanics reappears the real process of oil field development, the basic principle is that passing through using output and injection dynamic as value is determined
What the uncertain factor of adjustment model made to calculate determines that value (Production development) and reality coincide, the distribution of final clear remaining reserves
Situation, this method, which is used to evaluate remaining reserves, can specify current residual oil distribution situation, but it ignores oil gas and makees in gravity
Transport conditions under.
Oil gas is influenced to be constantly in motion state by gravity in aqueous reservoir, in the reservoir for stopping exploitation, weight
Power differentiation is the main power of oil gas migration and accumulation again, and above-mentioned a variety of remaining oil research technology methods have ignored remaining oil
This dynamic migration process, High water cut reservoir stop exploitation after, remaining oil can under gravity to advantageous trap again
Migration and accumulation, and current oil reservoir remaining oil distribution forecast does not account for the gravity of oil gas mostly, leads to prediction result not
It is enough accurate, influence the harvesting of oil reservoir.
Summary of the invention
The object of the present invention is to provide a kind of water-drive pool High water cut reservoir remaining oil distribution forecast methods, current to solve
Oil reservoir remaining oil distribution forecast does not account for the gravity of oil gas, leads to the problem that prediction result is not accurate enough.
The present invention provides a kind of water-drive pool High water cut reservoir remaining oil distribution forecast side to solve above-mentioned technical problem
Method, the prediction technique the following steps are included:
1) according to reservoir geology research data, characteristic parameter needed for determining characterization remaining oil distribution, the feature ginseng
Number includes stratum, petrophysical parameter and the fluid properties parameter of oil reservoir；
2) transport model of oil gas in oil reservoir High water cut reservoir is established according to identified characteristic parameter, and according to being established
Transport model determine that inner ring closes the oil gas quantity of middle aggregation during oil well stops production.
The present invention has fully considered the effect of gravity, using gravitational differentiation as guiding theory, establishes oil-gas migration rate
Model and Aggregation Model, can Accurate Prediction go out water-drive pool High water cut reservoir remaining oil distribution situation, can effectively analyze and comment
The forming process and enrichment positions of valence Water Flooding Layer remaining oil under the effect of gravity.
Further, the establishment process of the transport model is as follows:
A. according to gravitational differentiation principle, the relationship for establishing oil droplet when can migrate between suffered buoyancy and resistance；
B. oil-gas migration Rate Models are established according to the relationship between the buoyancy and resistance in Darcy's law and step A；
C. oil and gas migration distance and drainage area and oil-gas migration Rate Models centered on trap is utilized to determine circle
Close the oil and gas content of the aggregation during inherent oil well stops production.
Further, oil and gas content determined by the step C are as follows:
Wherein V is oil droplet difference in height；ρwFor the density of water；ρoFor oil droplet density；G is acceleration of gravity；α is stratigraphic dip；
σ is oil water interfacial tension；θ is angle of wetting；rtFor throat radius；rpFor pore radius；K is reservoir permeability；μ is fluid viscosity；
L is orifice throat length；φ is average effective porosity；soFor mobile oil saturation；For central angle；H is that reservoir average effective is thick
Degree；N is aggregate amount of the oil gas in trap.
Further, the oil-gas migration Rate Models that the step B is established are as follows:
Wherein v is fluid migration rate；F1It is oil gas to buoyancy component；PcFor capillary force；V is oil droplet difference in height；ρwFor
The density of water；ρoFor oil droplet density；G is acceleration of gravity；α is stratigraphic dip；σ is oil water interfacial tension；θ is angle of wetting；rtFor
Throat radius；rpFor pore radius；K is reservoir permeability；μ is fluid viscosity；L is orifice throat length.
Further, this method further includes advantageous trap being selected according to the oil gas quantity assembled in trap, and enclose to advantageous
Implementation remaining oil is closed to tap the latent power again.The present invention can instruct Water Flooding Layer remaining oil to tap the latent power again, further increase oil recovery.
Detailed description of the invention
Fig. 1 is that the present invention realizes that High water cut reservoir remaining oil distribution evaluates the flow chart taped the latent power；
Fig. 2 is that High water cut reservoir hydrocarbons divide incorgruous upper migration schematic diagram under the effect of gravity in the present invention；
Fig. 3 is for High water cut reservoir hydrocarbons in the present invention to updip direction migration schematic diagram in tilted stratum；
Fig. 4 is that High water cut reservoir remaining oil is enriched with schematic diagram again in trap in the present invention；
When Fig. 5 is that High water cut reservoir inclination angle is α in the present invention, oil gas stress decomposition diagram；
Fig. 6 is the oil-gas migration rate established in the present invention using certain characteristics of reservoirs parameter and stratigraphic dip relational model.
Specific embodiment
A specific embodiment of the invention is described further with reference to the accompanying drawing.
Under the effect of gravity, the different mixing liquid of density has the trend of upper lower leaf, the oil water mixture in oil reservoir
Equally have under the effect of gravity and divide different phenomenon again, and reservoir properties are better, under the effect of gravity the different speed of grease point
Rate is faster.The present invention fully considers the effect of gravity, being capable of the shape of effective assay Water Flooding Layer remaining oil under the effect of gravity
At process and enrichment positions, characteristic parameter needed for determining characterization remaining oil distribution according to reservoir geology research data first, so
The transport model of oil gas in oil reservoir High water cut reservoir is established according to identified characteristic parameter afterwards；Finally according to the migration established
Model determines that inner ring closes the oil gas quantity of middle aggregation during oil well stops production.The process of this method is as shown in Figure 1, below with reference to a certain
It is illustrated for specific oil reservoir region, High water cut reservoir hydrocarbons divide different migration to illustrate again under the effect of gravity in the example
As shown in Fig. 2, can intuitively reflect the trend that oil gas is migrated upwards under the effect of gravity, when Fig. 3 is pendage, oil gas is by edge
Inclined direction is migrated upwards；It encounters advantageous trap during oil-gas migration to be then enriched with, as shown in Figure 4；When pendage
Remaining oil stress is decomposed as shown in Figure 5 in reservoir.
The specific implementation process of this method is as follows.
1. characteristic parameter needed for determining characterization remaining oil distribution according to reservoir geology research data.
Reservoir sites basic research data is obtained, characteristic parameter needed for determining characterization remaining oil distribution, needed for of the invention
Parameter include reservoir formation parameter, petrophysical parameter and fluid properties parameter, specifically, required characteristic parameter includes average
Stratigraphic dip, reservoir mean permeability, average pore throat radius, underground crude oil density, underground crude oil viscosity and stratum water density.This
Characteristic parameter needed for the specific oil reservoir remaining oil distribution of certain obtained in embodiment is as follows: formation parameter includes: that stratigraphic dip is about
16 °~36 °；Petrophysical parameter includes: permeability value 100 × 10-3μm2, reservoir pore throat radius average value is 6 μm, reservoir
Average effective caliper 5.5m, average effective porosity 19.8%, residual oil saturation 31.3%；Fluid properties parameter includes: ground
Lower oil density 0.75g/cm3, viscosity 1.8mpa.s, underground oil water interfacial tension is 20-30 × 10-5N/cm。
2. establishing the transport model of oil gas in oil reservoir High water cut reservoir according to identified characteristic parameter.
A. the microcosmic force-bearing situation of oil droplet in reservoir is established based on gravity.
According to gravitational differentiation principle, according to oil droplet difference in height, the density of water, oil droplet density, acceleration of gravity, stratum
Inclination angle, oil water interfacial tension, angle of wetting, throat radius and pore radius establish oil droplet when can migrate suffered buoyancy and resistance it
Between relationship, such as formula (1):
Wherein F1It is oil gas to buoyancy component；V is oil droplet difference in height；ρwFor the density of water；ρoFor oil droplet density；G attaches most importance to
Power acceleration；α is stratigraphic dip；σ is oil water interfacial tension；θ is angle of wetting；rtFor throat radius；rpFor pore radius.
B. oil-gas migration Rate Models are established based on the relationship between characteristic parameter.
According to Darcy's law (2) and hydraulic formula (3), oil-gas migration Rate Models are established, as shown in formula (4):
Q=vA (3)
Wherein F1It is oil gas to buoyancy component；PcFor capillary force；Q is duct section flow；K is reservoir permeability；A is
Duct area of section；Δ p is that duct pressure at two ends is poor；μ is fluid viscosity；L is orifice throat length；V is fluid migration rate.
From formula (4) as can be seen that hydrocarbon migration and accumulation rate is directly proportional to reservoir permeability, with stratigraphic dip at positive
It closes, is inversely proportional with migration distance.
C. oil-gas accumulation model is established based on oil-gas migration Rate Models.
According to the oil and gas migration distance (5) and drainage area (6) centered on trap, establish in trap in oil well idling period
Between the oil gas quantity (7) assembled.
L=vt (5)
Wherein N is aggregate amount of the oil gas in trap, and t is oil-gas migration time (counting when stopping production from grease)；S is oil gas
The area of migration；H is reservoir average effective caliper；φ is average effective porosity；soFor mobile oil saturation；For central angle.
Formula (7), which has reflected the factor for influencing oil-gas accumulation quantity in trap, mainly oil-gas migration rate, migration time
(oil well off-time), reservoir effective thickness, reservoir effecive porosity and mobile oil saturation.
In calculating process, it is contemplated that the oil reservoir angle of wetting θ very little, cos θ ≈ 1, the oil reservoir drainage radius L are 200m.
The present embodiment utilizes the oil-gas migration Rate Models of formula (4), makes oil-gas migration rate and the stratum of the oil reservoir
Inclination angle relationship plate, as shown in fig. 6, the oil-gas migration rate under Different Strata inclination angle can be determined using the plate, such as
When stratigraphic dip is 30 °, it may be determined that going out the oil reservoir oil-gas migration rate is annual migration 20.9m, while utilizing oil-gas accumulation mould
Type determines the oil-gas accumulation quantity in trap during oil well stops production.In calculating process, it is contemplated that oil reservoir angle of wetting θ
Very little, cos θ ≈ 1, the oil reservoir drainage radius L are 200m.Determining waterflooding reservoir High water cut, ultra-high water-containing reservoir hydrocarbons
When aggregate amount, need to give the reservoir formation inclination value (such as 28 °) and oil-gas accumulation time (such as 10 years).Based on above-mentioned surplus
Excess oil Evaluation on distribution method can determine that the oil accumulation quantity of the oil reservoir structural high part oil well location after 14 years is 1648t,
Well control area 0.02km2, 26 ° of stratigraphic dip.
3. analyzing the aggregate site after remaining oil migration, and taped the latent power by oil-water well implementation.
Advantageous aggregate site after analyzing oil and gas migration is to find advantageous trap position, including structural trap, lithology circle
It closes and combined trap, after determining that the oil gas quantity of aggregation has reached the economic exploitation value, implementing process technical measures, to trap
Interior remaining oil is taped the latent power.In the oil reservoir of the present embodiment, it is structural high part that Remaining Oil And Gas, which reassembles position, utilizes oil
Well implementation is taped the latent power, certain above-mentioned oil well is increased day by day oily 9.6t by implementing perforating job again, initial stage.
The present invention is using gravitational differentiation as guiding theory, for the purpose of evaluating Remaining Oil, it is established that oil-gas migration
Rate Models and Aggregation Model, and determine the mechanism that remaining oil reassembles in oil well idling period, while analyzing oil and gas favorably gathers
Collect position, forms new remaining oil distribution forecast method.This method enters High water cut, ultra-high water-containing for waterflooding oil field
What development period proposed, this method explains that High water cut, remaining oil is enriched with again in the advantageous trap of ultra-high water-containing reservoir well
Hydrodynamics mechanism can formulate and implement effective Tapping Residual Oil and arrange on the basis of being enriched to the economic exploitation value
It applies.
Claims (5)
1. a kind of water-drive pool High water cut reservoir remaining oil distribution forecast method, which is characterized in that the prediction technique includes following
Step:
1) according to reservoir geology research data, characteristic parameter needed for determining characterization remaining oil distribution, the characteristic parameter packet
Include stratum, petrophysical parameter and the fluid properties parameter of oil reservoir；
2) transport model of oil gas in oil reservoir High water cut reservoir is established according to identified characteristic parameter, and according to the fortune established
Shifting formwork type determines that inner ring closes the oil gas quantity of middle aggregation during oil well stops production.
2. water-drive pool High water cut reservoir remaining oil distribution forecast method according to claim 1, which is characterized in that described
The establishment process of transport model is as follows:
A. according to gravitational differentiation principle, the relationship for establishing oil droplet when can migrate between suffered buoyancy and resistance；
B. oil-gas migration Rate Models are established according to the relationship between the buoyancy and resistance in Darcy's law and step A；
C. oil and gas migration distance and drainage area and oil-gas migration Rate Models centered on trap is utilized to determine in trap
The oil and gas content of aggregation during oil well stops production.
3. water-drive pool High water cut reservoir remaining oil distribution forecast method according to claim 2, which is characterized in that described
Oil and gas content determined by step C are as follows:
Wherein V is oil droplet difference in height；ρwFor the density of water；ρoFor oil droplet density；G is acceleration of gravity；α is stratigraphic dip；σ is
Oil water interfacial tension；θ is angle of wetting；rtFor throat radius；rpFor pore radius；K is reservoir permeability；μ is fluid viscosity；L is
Orifice throat length；φ is average effective porosity；soFor mobile oil saturation；For central angle；H is reservoir average effective caliper；N
The aggregate amount for being oil gas in trap.
4. water-drive pool High water cut reservoir remaining oil distribution forecast method according to claim 2, which is characterized in that described
The oil-gas migration Rate Models that step B is established are as follows:
Wherein v is fluid migration rate；F1It is oil gas to buoyancy component；PcFor capillary force；V is oil droplet difference in height；ρwFor water
Density；ρoFor oil droplet density；G is acceleration of gravity；α is stratigraphic dip；σ is oil water interfacial tension；θ is angle of wetting；rtFor venturi
Radius；rpFor pore radius；K is reservoir permeability；μ is fluid viscosity；L is orifice throat length.
5. water-drive pool High water cut reservoir remaining oil distribution forecast method according to claim 1, which is characterized in that the party
Method further includes advantageous trap being selected according to the oil gas quantity assembled in trap, and implement remaining oil to advantageous trap and tap the latent power again.
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| CN111173507A (en) * | 2020-03-17 | 2020-05-19 | 中国石油化工股份有限公司 | High-water-cut oil field residual oil prediction method |
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| CN112001132A (en) * | 2020-08-06 | 2020-11-27 | 中国石油化工股份有限公司 | Rigid water-drive reservoir residual oil distribution condition determining method and oil extraction method |
| CN113283648A (en) * | 2021-05-25 | 2021-08-20 | 中国石油化工股份有限公司 | Prediction method for residual oil in high-water-content old area |
| CN113283648B (en) * | 2021-05-25 | 2024-05-14 | 中国石油化工股份有限公司 | Prediction method suitable for high-water-content old-area residual oil |
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| CN113283648A (en) * | 2021-05-25 | 2021-08-20 | 中国石油化工股份有限公司 | Prediction method for residual oil in high-water-content old area |
| CN113283648B (en) * | 2021-05-25 | 2024-05-14 | 中国石油化工股份有限公司 | Prediction method suitable for high-water-content old-area residual oil |
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