CN109915122A - The method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water - Google Patents
The method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water Download PDFInfo
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- CN109915122A CN109915122A CN201910161368.9A CN201910161368A CN109915122A CN 109915122 A CN109915122 A CN 109915122A CN 201910161368 A CN201910161368 A CN 201910161368A CN 109915122 A CN109915122 A CN 109915122A
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Abstract
The invention discloses a kind of methods for invading water influx using global equation calculation fracture-pore reservoir Stationary Water, divided stages comprising driving energy, the acquisition of productivity index, the acquisition of combination drive stage water influx, this five steps of total acquisition of water influx in oil reservoir when pure water drives acquisition and the abandonment pressure of stage water influx, the present invention provides a kind of foundation, and the new method that fracture-pore reservoir Stationary Water invades water influx is calculated on global equation, this method can solve the problem of fracture-pore reservoir quantifies water influx during stable state water enchroachment (invasion), it does not need to carry out certain prediction to water body form and size, and meet the basic law of stable state water enchroachment (invasion) process medium fluid flowing, error is smaller.
Description
Technical field
The present invention relates to mining technique fields, and quantitative Stationary Water inundation is invaded when in particular to fracture-pore reservoir is developed
The calculation method of amount.
Background technique
During oil reservoir development, the main reason for influencing development effectiveness is the intrusion of water body, once oil well water breakthrough, oil-producing
Amount can be reduced constantly, and water yield, which is continuously increased, leads to waterflood, seriously affects the development effectiveness and ultimate recovery of oil reservoir.
Fractured-vuggy reservoir type is more, is broadly divided into Caves, and slit formation and the two are compound.And each type is due to it
Reservoir Scale is different, and way of contact difference causes its heterogeneity very strong, without certain regularity.Such as the water of Caves reservoir
The process of invading is mostly stable state water enchroachment (invasion) and quasi-stable state water enchroachment (invasion), and slit formation and the compound then unstable state water enchroachment (invasion) of the two are in the majority.Therefore in oil
It hides in recovery process, pressure supply mode is complex, and water influx is difficult to system-computed.
Water influx analysis is reservoir performance analysis, water flood recovery scheme is determining and controls basis work early period that water measure is implemented
Make.Stable state water enchroachment (invasion) refers to when oil reservoir has sufficient side water continuously to feed, or oil reservoir pressure drop is relatively steady due to rate of oil production is not high
The state of timing can ignore time factor, be embodied at this point, pressure and flow are unchanged over time, with
The progress of water enchroachment (invasion), water influx be pressure remained steadies constantly rise but oil-water interfaces.
It is mainly Schilthuis steady-state model that currently used stable state water enchroachment (invasion) amount, which calculates model,.Outside model hypothesis water-bearing layer
The pressure on boundary is kept constant, and is original formation pressure, and the flowing in reservoir meets Darcy's law, and directly proportional to pressure difference,
It is assumed that the form of aqueous viscosity, average in-place permeability and water-bearing layer is kept constant.Its qualifications is complicated, needs to water body shape
State and size carry out certain conjecture, then carry out tentative calculation, there is a certain error.
Summary of the invention
The technical problem to be solved in the present invention is that calculating model for stable state water enchroachment (invasion) amount commonly used in the prior art
Schilthuis steady-state model qualifications are complicated, need to carry out certain conjecture to water body form and size, then be tried
It calculates, the technological deficiency that there is a certain error, provides and a kind of invade water influx using global equation calculation fracture-pore reservoir Stationary Water
Method.
The present invention solves its technical problem, used to invade water influx using global equation calculation fracture-pore reservoir Stationary Water
Method, comprise the following steps:
S1, driving energy is divided by pure flexible drive stage, combination drive according to the relationship of cumulative liquid production and oil pressure
Stage, pure water driving stage and artificial edge-bottom water drive four driving stages；
S2, the cumulative oil production N for obtaining the flexible drive stagep1And P is lost in the strata pressure in flexible drive stage1-P2,
Calculate productivity index J:
S3, the cumulative oil production N for obtaining the combination drive stagep2, the combination drive stage strata pressure be lost P2-P3And
Oil formation volume factor Bo, it is calculate by the following formula the water influx W in combination drive stagee1:
We1={ Np2-J(P2-P3)}Bo；
S4, the cumulative oil production N for obtaining the pure water driving stagep3And oil formation volume factor Bo, it is calculate by the following formula
The water influx W in combination drive stagee2:
We2=Np3Bo；
The S5, (1-p/p that pure flexible drive stage, combination drive stage and pure water are driven to stage three phasesi) and this
The water influx at moment is corresponding, with We(t) Y-axis, (1-p/p are used asi) it is used as X-axis, and straight line is fitted, it will discard at this time
Pressure substitutes into straight line and finds out total water influx Wei；Wherein, piFor initial formation pressure, p is the stratum at each moment in oil reservoir development
Pressure.
Further, in the method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water of the invention,
Each strata pressure P1, P2, P3, p, pi, cumulative oil production Np1、Np2、Np3, oil formation volume factor BoAnd abandonment pressure is equal
It is to be obtained according to the daily continuous data of oil gas field.
Implement the method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water of the invention, has with following
Beneficial effect: the present invention provides a kind of foundation, and the new side that fracture-pore reservoir Stationary Water invades water influx is calculated on global equation
Method, this method can solve fracture-pore reservoir and the problem of quantitative water influx, do not need to water body form during stable state water enchroachment (invasion)
Certain prediction is carried out with size, and meets the basic law of stable state water enchroachment (invasion) process medium fluid flowing, error is smaller.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing:
Fig. 1 is one embodiment of method that water influx is invaded using global equation calculation fracture-pore reservoir Stationary Water of the invention
Flow chart；
Fig. 2 is four driving divided stages schematic diagrames of driving energy；
Fig. 3 is the fitting schematic diagram of straight line.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail
A specific embodiment of the invention.
It is the method one that water influx is invaded using global equation calculation fracture-pore reservoir Stationary Water of the invention with reference to Fig. 1, Fig. 1
The flow chart of embodiment.In the present embodiment, the present invention includes following method:
S1, driving energy is divided by pure flexible drive stage, combination drive according to the relationship of cumulative liquid production and oil pressure
Stage, pure water driving stage and artificial edge-bottom water drive four driving stages, and referring in particular to Fig. 2, wherein P1 indicates that pure elasticity is driven
Strata pressure when dynamic stage starting, P2 indicated at the end of the pure flexible drive stage strata pressure namely from the combination drive stages
The strata pressure when beginning, ground when strata pressure namely pure water driving stage at the end of the P3 expression combination drive stage start
Stressor layer.The division in driving stage is to belong to the prior art, such as bibliography: the woods of sinus writes, Carbonate Rocks In Tahe Oilfield seam
Hole type reservoir development technique, 2012, petroleum industry publishing house, but the present invention is not limited thereto.
S2, in pure flexible drive stage, that is, reset condition, be the process of oil body pressure diffusion, at this time without water body generate,
Therefore the cumulative oil production N in available flexible drive stagep1And P is lost in the strata pressure in flexible drive stage1-P2, meter
Calculate productivity index J:
The energy of S3, combination drive stage namely oil body start the stage of decaying.The accumulation for obtaining the combination drive stage produces
Oil mass Np2, the combination drive stage strata pressure be lost P2-P3And oil formation volume factor Bo, it is calculate by the following formula mixing
The water influx W in driving stagee:
We={ Np2-J(P2-P3)}Bo；
S4, pure water drive the stage when, edge-bottom water energy starts to supplement at this time.Obtain the accumulation oil-producing in pure water driving stage
Measure Np3And oil formation volume factor Bo, it is calculate by the following formula the water influx W in combination drive stagee:
We=Np3Bo；
S5, based on global equation method it is found that under the conditions of stable state water enchroachment (invasion), water influx W in oil reservoire(t) with (1-p/pi) in pass
System is WeiProportional relation, it may be assumed thatWherein, We(t) water influx in oil reservoir is indicated；WeiIndicate useless
Abandon total water influx when pressure.
Therefore, in this step, by pure flexible drive stage, combination drive stage and pure water driving stage three phases
(1-p/pi) corresponding with water influx in the oil reservoir at this moment, with We(t) Y-axis, (1-p/p are used asi) it is used as X-axis, and fit one
Straight line, curve can be found in Fig. 3, and total water influx W can be found out at this time by substituting into abandonment pressure in the straight line that fitting obtainsei；Its
In, piFor initial formation pressure, p is the strata pressure at each moment in oil reservoir development.
Further, in the method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water of the invention,
Each strata pressure P1, P2, P3, p, pi, cumulative oil production Np1、Np2、Np3, oil formation volume factor BoAnd abandonment pressure is equal
It is to be obtained according to the daily continuous data of oil gas field.
During oil reservoir development, injection-production ratio is balanced flood situation during characterization water flooding, and reflection produces liquid
Amount, the overall target contacted between water injection rate and strata pressure, and it is significant to oil field development measure and raising recovery ratio.
The determination of bottom and edge water injection-production ratio needs accurate water influx to rely on, so that deriving edge-wa- ter reservoir strata pressure restores speed
The relational expression of degree and injection-production ratio realizes calculating and reasonable prediction to injection-production ratio.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (2)
1. a kind of method for invading water influx using global equation calculation fracture-pore reservoir Stationary Water, which is characterized in that comprising as follows
Step:
S1, according to the relationship of cumulative liquid production and oil pressure by driving energy be divided into the pure flexible drive stage, the combination drive stage,
Pure water drives stage and artificial edge-bottom water to drive four driving stages；
S2, the cumulative oil production N for obtaining the flexible drive stagep1And P is lost in the strata pressure in flexible drive stage1-P2, calculate
Productivity index J:
S3, the cumulative oil production N for obtaining the combination drive stagep2, the combination drive stage strata pressure be lost P2-P3And crude oil
Reservoir volume ratio Bo, it is calculate by the following formula the water influx W in combination drive stagee1:
We1={ Np2-J(P2-P3)}Bo；
S4, the cumulative oil production N for obtaining the pure water driving stagep3And oil formation volume factor Bo, it is calculate by the following formula mixing
The water influx W in driving stagee2:
We2=Np3Bo；
The S5, (1-p/p that pure flexible drive stage, combination drive stage and pure water are driven to stage three phasesi) and this moment
Water influx is corresponding, with We(t) Y-axis, (1-p/p are used asi) it is used as X-axis, and straight line is fitted, at this time by abandonment pressure generation
Enter straight line and finds out total water influx Wei；Wherein, piFor initial formation pressure, p is the strata pressure at each moment in oil reservoir development.
2. the method according to claim 1 for invading water influx using global equation calculation fracture-pore reservoir Stationary Water, special
Sign is, each strata pressure P1, P2, P3, p, pi, cumulative oil production Np1、Np2、Np3, oil formation volume factor Bo, and it is discarded
Pressure is obtained according to the daily continuous data of oil gas field.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112487594A (en) * | 2019-08-23 | 2021-03-12 | 中国石油天然气股份有限公司 | Oil reservoir water body multiple calculation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112487594A (en) * | 2019-08-23 | 2021-03-12 | 中国石油天然气股份有限公司 | Oil reservoir water body multiple calculation method and device |
| CN112487594B (en) * | 2019-08-23 | 2022-11-01 | 中国石油天然气股份有限公司 | Oil reservoir water body multiple calculation method and device |
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