CN106529199A - Determining method for conglomerate oil reservoir chemical flooding well spacing - Google Patents
Determining method for conglomerate oil reservoir chemical flooding well spacing Download PDFInfo
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- CN106529199A CN106529199A CN201611157303.XA CN201611157303A CN106529199A CN 106529199 A CN106529199 A CN 106529199A CN 201611157303 A CN201611157303 A CN 201611157303A CN 106529199 A CN106529199 A CN 106529199A
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Abstract
The invention provides a determining method for conglomerate oil reservoir chemical flooding well spacing. The method comprises the steps of (1), solving formation pressure gradients among injection and production wells according to injection and production well spacing and injection and production well pressure differences; (2), obtaining injection well permeability-formation pressure gradient relational expressions through logarithm regression; (3), dividing the injection and production well pressure differences into different intervals, and obtaining corresponding formation pressure gradient-injection and production well spacing relational expressions through exponential regression according to the injection well permeability in the intervals and the formation pressure gradients among the injection and production wells obtained in the step (1); (4), drawing a plate; and (5), obtaining the corresponding formation pressure gradients on the plate obtained in the step (4) through an injection well permeability-formation pressure gradient curve, and obtaining the injection and production well spacing under the formation pressure gradients according to a formation pressure gradient-injection and production well curve in the corresponding injection and production well pressure differences. According to the method provided by the invention, the conglomerate oil reservoir polymer flooding well pattern well spacing can be obtained rapidly and accurately.
Description
Technical field
A kind of the present invention relates to oil reservoir development technical field, more particularly to determination method of Conglomerate Reservoir chemical flooding well spacing.
Background technology
Conglomerate Reservoir with the deposition characteristics different from conventional sandstone reservoir, the pore structure of conventional physical property and complexity and
Heterogeneous reservoirs in plane and on vertical profile, bring great difficulty to the exploitation of Conglomerate Reservoir.Conglomerate Reservoir permeates
Rate is one of important content that oil reservoir development is evaluated, and is the ability that rock is allowed fluid from, and permeability is oil storage (gas) rock thing
Property important parameter, be the important indicator for predicting oil field development production target and dynamic change situation.
The patent of Application No. 201510847426.5 discloses a kind of oil reservoir Well Pattern And Spacing and determines method and device, foundation
Different sedimentary facies and Reservoir type combination is divided, the water drive control of different injection production well arrangements is calculated, with reference to block to be measured
Oil in place and results of numerical simulation, draw the overall water drive control of block to be measured and the total well number of different Well Pattern And Spacings
Curve chart, and determine the oil reservoir Well Pattern And Spacing of block to be measured according to curve chart.The patent of Application No. 201410638170.2
Disclose a kind of low-permeability oil deposit CO2Drive technical limit well space and determine method, CO is set up by physical test2Drive technological limit to supply
Oily radius calculation formula, with the strata pressure distribution situation for obtaining, calculates the proportionality coefficient in mixed phase region and immiscible region domain,
Using CO2Drive technical limit well space computing formula and be calculated technical limit well space under the present condition of stratum.Application No.
201510353756.9 patent discloses a kind of method for determining low-permeability oil deposit effective displacement injector producer distance, by water filling
When system is connected with oil extraction system, each low-permeability oil deposit pseudo-linear is determined according to the data of flood pattern and the data of oil extraction system
Filtrational resistance gradient, it is determined that the effective displacement injector producer distance under the conditions of different average notes adopt pressure differential.Above-mentioned determination well pattern well
Away from method, typically all experimental technique or determine method with the Well Pattern And Spacing that non-polymer solution is displacing medium, it is difficult to
During actual development suitable for the Conglomerate Reservoir chemical displacement of reservoir oil.
The content of the invention
For above-mentioned technical problem, it is an object of the invention to provide a kind of determination side of Conglomerate Reservoir chemical flooding well spacing
Method, provides scientific basis for well net deployment of the technique of polymer flooding in Conglomerate Reservoir development process.
The technical solution used in the present invention is：
A kind of determination method of Conglomerate Reservoir chemical flooding well spacing, comprises the following steps：
(1) the formation pressure gradient k between injection-production well is tried to achieve according to producer-injector spacing and injection-production well pressure reduction：
K=(Pw-P0)/L (1)
In formula, k is the formation pressure gradient between injection-production well, PwFor injection well flowing bottomhole pressure (FBHP), PoFor producing well flowing bottomhole pressure (FBHP),
L is producer-injector spacing, Pw- PoFor injection-production well pressure reduction；
(2) according to the formation pressure gradient k between the injection-production well described in injection well permeability and step (1), using right
Number recurrence obtains injection well permeability-formation pressure gradient relational expression, such as formula (2)：
K=a1ln(a)+b1 (2)
In formula α be injection well permeability, k be injection-production well between formation pressure gradient, a1And b1For regression coefficient；
(3) injection-production well pressure reduction is divided into different interval, according to the injection well permeability and step (1) in each interval
Injection-production well between formation pressure gradient, corresponding formation pressure gradient-producer-injector spacing relation is obtained using index return
Formula, such as formula (3)：
In formula x be injector producer distance, k be injection-production well between formation pressure gradient, a2And b2For regression coefficient；
(4) plate is drawn, injection is drawn according to injection well permeability described in step (2)-formation pressure gradient relational expression
Well permeability-formation pressure gradient curve；Drawn according to formation pressure gradient described in step (3)-producer-injector spacing relational expression
Formation pressure gradient under different injection-production well pressure reduction-producer-injector spacing curve；
(5) described in step (4) on plate, first according to injection well permeability α, by the injection well permeability-ground
Stressor layer gradient curve obtains its corresponding formation pressure gradient, further according to the strata pressure ladder in corresponding injection-production well pressure reduction
Degree-producer-injector spacing curve, obtains the producer-injector spacing under the formation pressure gradient.
The determination method of Conglomerate Reservoir chemical flooding well spacing of the present invention, wherein, a in step (2)1=-0.041；b1=
0.3531。
The determination method of Conglomerate Reservoir chemical flooding well spacing of the present invention, wherein, 0.20 in step (3)<a2<0.45；-
0.008<b2<-0.007。
Beneficial effect of the present invention：
(1) the determination method of Conglomerate Reservoir chemical flooding well spacing of the present invention, Method And Principle are clear, quantification, can grasp
The property made is strong, is easy to use, and disposes for development plan Well Pattern And Spacing and the construction operation at scene provides reliable reference frame.
(2) the determination method of Conglomerate Reservoir chemical flooding well spacing of the present invention, can rapidly and accurately obtain Conglomerate Reservoir
Polymer displacement oil well net well spacing, low cost, efficiency high.For the block of deployed well pattern, adjustment well pattern well can be instructed by the method
Away from and injection production pressure difference, for optimized well pattern deployment foundation is provided；Meanwhile, problem of the method to Well Pattern And Spacing under calculating other conditions
With stronger reference function.
Description of the drawings
Fig. 1 a are the schematic diagram of injection well permeability-formation pressure gradient curve of the present invention；
When Fig. 1 b are 18MPa for injection-production well pressure reduction, the schematic diagram of formation pressure gradient-producer-injector spacing curve；
When Fig. 1 c are 16MPa for injection-production well pressure reduction, the schematic diagram of formation pressure gradient-producer-injector spacing curve；
When Fig. 1 d are 14MPa for injection-production well pressure reduction, the schematic diagram of formation pressure gradient-producer-injector spacing curve；
When Fig. 1 e are 12MPa for injection-production well pressure reduction, the schematic diagram of formation pressure gradient-producer-injector spacing curve.
Below in conjunction with specific embodiments and the drawings, the invention will be further described.
Specific embodiment
A kind of determination method of Conglomerate Reservoir chemical flooding well spacing, comprises the following steps：
(1) the formation pressure gradient k between injection-production well is tried to achieve according to producer-injector spacing and injection-production well pressure reduction：
K=(Pw-P0)/L
In formula, k is the formation pressure gradient between injection-production well, PwFor injection well flowing bottomhole pressure (FBHP), PoFor producing well flowing bottomhole pressure (FBHP),
L is producer-injector spacing, Pw- PoFor injection-production well pressure reduction；L and Pw- PoAnd the result of calculation of k is as shown in table 1；
(2) according to the formation pressure gradient between the injection-production well described in injection well permeability and step (1), using logarithm
Recurrence obtains injection well permeability-formation pressure gradient relational expression, such as following formula：
K=-0.041 ln (α)+0.3531
In formula, α is injection well permeability, and k is the formation pressure gradient between injection-production well, and α and k is as shown in table 1；
(3) injection-production well pressure reduction is divided into different interval, according to the injection well permeability and step (1) in each interval
Injection-production well between formation pressure gradient, corresponding formation pressure gradient-producer-injector spacing relation is obtained using index return
Formula, such as following formula：
During 18MPa：
K=0.4438e-0.008x
During 16MPa：
K=0.2926e-0.007x
During 14MPa：
K=0.2882e-0.007x
During 12MPa：
K=0.2335e-0.007x
In formula, x is injector producer distance, and y is the formation pressure gradient between injection-production well；
(4) plate is drawn, the plate is as shown in figure 1, according to injection well permeability-strata pressure described in step (2)
Gradient relation draws injection well permeability-formation pressure gradient curve, as shown in Figure 1a；According to stratum described in step (3)
Barometric gradient-producer-injector spacing relational expression draws the formation pressure gradient-producer-injector spacing curve under different injection-production well pressure reduction, such as
Shown in Fig. 1 b-1e；
(5), described in step (4) on plate, A points are found according to injection well permeability α first, vertical line and injection is done from A points
Well permeability-formation pressure gradient curve intersection obtains its corresponding formation pressure gradient in B points；Horizontal line is done with phase in B points
The formation pressure gradient answered-producer-injector spacing curve intersection, in point C, is the strata pressure ladder with injection production pressure difference for 16MPa in Fig. 1
Degree-producer-injector spacing curve intersection, then do vertical line and producer-injector spacing coordinate axess from C points and intersect at D points, the then corresponding number of D points
Value is the producer-injector spacing.
The present embodiment drawn according to the actual well spacing data of the multiple blocks of Xinjiang Conglomerate Reservoir, many successes in production
With the directive significance with practicable, related data are shown in Table 1, and table 1 is to turn polymer in the Conglomerate Reservoir block water drive later stage
Well spacing during drive calculates data, on the basis of raw water drives well pattern, disposes polymerization by the mode such as producing well tuberculosiss and the new well of benefit
Thing drives well pattern.
1 plate data table related of table
Embodiment described above is only that the preferred embodiment of the present invention is described, not the model to the present invention
Enclose and be defined, on the premise of without departing from design spirit of the present invention, technical side of the those of ordinary skill in the art to the present invention
Various modifications and improvement that case is made, all should fall in the protection domain of claims of the present invention determination.
Claims (3)
1. a kind of determination method of Conglomerate Reservoir chemical flooding well spacing, it is characterised in that：Comprise the following steps：
(1) the formation pressure gradient k between injection-production well is tried to achieve according to producer-injector spacing and injection-production well pressure reduction：
K=(Pw-P0)/L (1)
In formula, k is the formation pressure gradient between injection-production well, PwFor injection well flowing bottomhole pressure (FBHP), PoFor producing well flowing bottomhole pressure (FBHP), L is
Producer-injector spacing, Pw- PoFor injection-production well pressure reduction；
(2) according to the formation pressure gradient between the injection-production well described in injection well permeability and step (1), using logarithm regression
Obtain injection well permeability-formation pressure gradient relational expression, such as formula (2)：
K=a1 ln(a)+b1 (2)
In formula α be injection well permeability, k be injection-production well between formation pressure gradient, a1And b1For regression coefficient；
(3) injection-production well pressure reduction is divided into different interval, according to the injection well permeability in each interval and the note described in step (1)
The formation pressure gradient between well is adopted, corresponding formation pressure gradient-producer-injector spacing relational expression is obtained using index return, such as
Formula (3)：
In formula x be injector producer distance, k be injection-production well between formation pressure gradient, a2And b2For regression coefficient；
(4) plate is drawn, injection well is drawn according to injection well permeability described in step (2)-formation pressure gradient relational expression and is oozed
Saturating rate-formation pressure gradient curve；Draw different according to formation pressure gradient described in step (3)-producer-injector spacing relational expression
Formation pressure gradient under injection-production well pressure reduction-producer-injector spacing curve；
(5) described in step (4) on plate, first according to injection well permeability α, by the injection well permeability-ground lamination
Power gradient curve obtains its corresponding formation pressure gradient, further according to the formation pressure gradient-note in corresponding injection-production well pressure reduction
Well well spacing curve is adopted, the producer-injector spacing under the formation pressure gradient is obtained.
2. the determination method of Conglomerate Reservoir chemical flooding well spacing according to claim 1, it is characterised in that：A in step (2)1
=-0.041；b1=0.3531.
3. the determination method of Conglomerate Reservoir chemical flooding well spacing according to claim 1 and 2, it is characterised in that：In step (3)
0.20<a2<0.45；-0.008<b2<-0.007。
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Cited By (1)
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| CN111622736A (en) * | 2020-04-14 | 2020-09-04 | 中国石油大学(华东) | Method and system for determining limit well spacing of heavy oil reservoir chemical flooding technology |
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| CN111622736B (en) * | 2020-04-14 | 2023-04-07 | 中国石油大学(华东) | Method and system for determining limit well spacing of heavy oil reservoir chemical flooding technology |
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Effective date of registration: 20201109 Address after: Intercontinental building, 16 ande Road, Dongcheng District, Beijing, 100007 Patentee after: PetroChina Co.,Ltd. Address before: 834000 No. 29, Junggar Road, Karamay District, the Xinjiang Uygur Autonomous Region, Karamay Patentee before: RESEARCH INSTITUTE OF EXPLORATION & DEVELOPMENT, PETROCHINA XINJIANG OILFIELD Co. |