CN110273673A - A kind of fracture-pore reservoir space structure flooding pattern optimum design method - Google Patents
A kind of fracture-pore reservoir space structure flooding pattern optimum design method Download PDFInfo
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- CN110273673A CN110273673A CN201810208667.9A CN201810208667A CN110273673A CN 110273673 A CN110273673 A CN 110273673A CN 201810208667 A CN201810208667 A CN 201810208667A CN 110273673 A CN110273673 A CN 110273673A
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- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000011148 porous material Substances 0.000 title claims abstract description 40
- 238000004519 manufacturing process Methods 0.000 claims abstract description 61
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 32
- 239000007924 injection Substances 0.000 claims abstract description 32
- 230000015572 biosynthetic process Effects 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 8
- 238000005457 optimization Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 230000008447 perception Effects 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000272525 Anas platyrhynchos Species 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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Abstract
The invention proposes a kind of fracture-pore reservoir space structure flooding pattern optimum design methods, wherein, there are multiple wells in the block of oil field, the fracture-pore reservoir space structure flooding pattern optimum design method is comprising steps of S1): multiple initial injection-production programs are determined according to the type of the position of each mouth well or the Reservoir Body of each mouth well；S2): calculating separately connecting degree between the injection-production well of each initial injection-production program；S3): according to connecting degree between the injection-production well of each initial injection-production program, calculating separately the Gini coefficient of connecting degree between injection-production well；S4): selecting the smallest initial injection-production program of Gini coefficient as final injection-production program.Fracture-pore reservoir space structure flooding pattern optimum design method of the invention avoid injection water along high flow-guiding channel alter so that caused by unidirectionally imitated, improve injection water sweep efficiency.
Description
Technical field
The present invention relates to oil-gas exploration and development technical fields, more particularly it relates to a kind of fracture-pore reservoir space
Structure pattern flooding oil recovery optimum design method.
Background technique
China's Marine Carbonate Rocks oil reservoir is mainly distributed on Tarim Basin, based on fracture hole type.Ordovician of Tahe oil
Oil reservoir is the largest fracture-pore reservoir that China has now been found that.By the end of the year 2016, verified oil oil in place has reached
13.36 hundred million tons.Start to fill the water within Tahe fracture-pore reservoir 2005, by the end of the year 2016, unit water filling covering oil in place 5.98
It hundred million tons, accounts for and has developed the 69% of output, have become the main supplement energy development scheme of system in Tahe Oilfield.
Space structure well pattern is according to different Karst Geological Landscape backgrounds, using different well pattern construction methods: weathering crust type note
Relationship is adopted with the characteristics of " low note height, which adopts, stitches orifice hole adopts, duck eye is infused big hole and adopted ", establishes " planar " flooding pattern；Disconnected control type note
Well group is adopted based on the injection-production relation of " contour note adopt, stitch note hole adopt, adopt in marginal not ", the flooding pattern of foundation " ribbon "；Secretly
River type injection-production well group easily forms the injection-production relation of " low note height is adopted, hole note hole is adopted ", establishes " threadiness " flooding pattern.
Main problem of the existing technology is:
Existing well pattern design method provides only a kind of design principle, is unable to satisfy the needs of practical fine development.One side
Face, fracture-pore reservoir heterogeneity is extremely strong, note adopt effect not only with injection-production well bore meet Reservoir Body type it is related, preserved between well
Body is equally in close relations.Determine that note is adopted according to the Reservoir Body type met is bored, according to insufficient.On the other hand, fracture-pore reservoir is infused
Adopting well pattern is to be constructed on the basis of initial well pattern by oil well to injection, according to mentioned above principle, how is likely to be obtained more sets of plan
Design is advanced optimized, is not referred to.Therefore, the prior art is not able to satisfy the needs of fine development.
Summary of the invention
To solve the above problems, the bright purpose of this law is to propose a kind of fracture-pore reservoir space structure flooding pattern optimization
Design method, thus realize avoid injection water along high flow-guiding channel alter so that caused by unidirectionally imitated, which thereby enhance injection water
Sweep efficiency.To realize the purpose, the invention proposes a kind of fracture-pore reservoir space structure flooding pattern optimization design sides
Method, wherein there are multiple wells in the block of oil field, the fracture-pore reservoir space structure flooding pattern optimum design method includes
Step:
S1): multiple initial injection-production programs are determined according to the type of the position of each mouth well or the Reservoir Body of each mouth well；
S2): calculating separately connecting degree between the injection-production well of each initial injection-production program；
S3): according to connecting degree between the injection-production well of each initial injection-production program, calculating separately connecting degree between injection-production well
Gini coefficient；
S4): selecting the smallest initial injection-production program of Gini coefficient as final injection-production program.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step S3), root
According to connecting degree between the injection-production well of each initial injection-production program, the Lorentz curve of connecting degree between injection-production well is drawn respectively, from
And obtain the Gini coefficient.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step S1), root
Multiple initial injection-production programs are determined according to " low note height is adopted " principle.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step S1), also
Multiple initial note sides of adopting can be determined according to " moisture content is greater than 98% or well of the oil production less than 1t/d is as water injection well " principle
Case.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein according to " slit formation preserves
It is the well of water injection well and Caves Reservoir Body is producing well that the well of body, which is the well of water injection well and slit formation Reservoir Body, " principle determination is more
A initial injection-production program.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step sl, more
In a initial injection-production program, select wherein a well in the multiple wells as water injection well respectively, its in the multiple wells
Its well is as producing well.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step S2), base
In conductivity and dynamic indicator prediction model and pass through fitting yield that volume is established are controlled, is finally inversed by conductivity, wherein conduction
Rate is the characterization parameter of interwell communication degree,
The dynamic indicator prediction model are as follows:
Wherein, TijFor the conductivity between i-th mouthful of well and jth mouth well；
μiFor viscosity of crude；
piAnd pjThe respectively bottom pressure of i-th mouthful of well and jth mouth well；
qiFor i-th mouthful of well yield；
CtFor system compressibility；
VpiFor the control volume of i-th mouthful of well；
P controls the average pressure of volume between well；
T is the time.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein have in the block of oil field
There is Wu Koujing.
Fracture-pore reservoir space structure flooding pattern optimum design method as described above, wherein in step sl, more
In a initial injection-production program, select a well in five mouthfuls of wells as water injection well respectively, other four mouthfuls of wells are as producing well
The present invention is in view of the above-mentioned problems, in fracture-pore reservoir space structure flooding pattern optimum design method of the invention
In, multiple initial injection-production programs are determined according to the type of the position of each mouth well or the Reservoir Body of each mouth well, then calculate not Tongfang
Connecting degree between case injection-production well is obtained connect between injection-production well respectively according to connecting degree between the injection-production well of each initial injection-production program
The Gini coefficient of logical degree, compares connecting degree Gini coefficient, and finally taking the smallest scheme of Gini coefficient is final scheme.The party
Method is according to connecting degree preferred embodiment, it then follows it is logical along high water conservancy diversion to avoid injection water for the smallest principle of connecting degree Gini coefficient
Road is unidirectionally imitated caused by altering in turn, improves the sweep efficiency of injection water.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 is the flow chart of fracture-pore reservoir space structure flooding pattern optimum design method of the invention；
Fig. 2 is the schematic diagram of fracture-pore reservoir space structure flooding pattern optimum design method of the invention；
Fig. 3 is the Lorentz curve and Gini coefficient schematic diagram of the embodiment of the present invention；
Fig. 4 is the schematic diagram that well location of the invention and flooding pattern design initial scheme；
Fig. 5 is the schematic diagram that different schemes Gini coefficient of the invention compares.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention, and the present invention will be further described with reference to the accompanying drawings.
Fig. 1 to Fig. 5 be respectively fracture-pore reservoir space structure flooding pattern optimum design method of the invention flow chart,
The Lorentz of the schematic diagram of fracture-pore reservoir space structure flooding pattern optimum design method of the invention, the embodiment of the present invention
Curve and Gini coefficient schematic diagram, well location of the invention and flooding pattern design initial scheme schematic diagram and it is of the invention not
With the schematic diagram of scheme Gini coefficient comparison.
As shown in Figure 1, the invention proposes a kind of fracture-pore reservoir space structure flooding pattern optimum design method,
In, in the block of oil field have multiple wells, the fracture-pore reservoir space structure flooding pattern optimum design method comprising steps of
S1): multiple initial injection-production programs are determined according to the type of the position of each mouth well or the Reservoir Body of each mouth well；S2): calculating separately each
Connecting degree between the injection-production well of a initial injection-production program；S3): according to connecting degree between the injection-production well of each initial injection-production program,
Calculate separately the Gini coefficient of connecting degree between injection-production well；S4): selecting the smallest initial injection-production program of Gini coefficient as final
Injection-production program.
Specifically, as shown in Fig. 2, in step sl, determining multiple initial injection-production programs, root according to " low note height is adopted " principle
According to " it be the well of water injection well and Caves Reservoir Body is oil recovery that the well of slit formation Reservoir Body, which is the well of water injection well and slit formation Reservoir Body,
Well " principle determines multiple initial injection-production programs, and/or initial flooding pattern scheme can also be determined according to the condition of production of well.
In step S1, above-mentioned factor can also be comprehensively considered to determine multiple initial flooding pattern schemes, i.e., selection position it is lower,
The well for meeting slit formation Reservoir Body, production status bad (moisture content>98% or oil production<1t/d) is bored as water injection well；Select position
It sets the well higher, it is good that brill meets Caves Reservoir Body, production status and does producing well.In one embodiment, in multiple initial notes
It adopts in scheme, selects wherein a well in multiple wells as water injection well respectively, other mouthfuls of wells in multiple wells are as recovering the oil
Well.
Further, in step s 2, the dynamic indicator prediction model established based on conductivity and the control volume of well and
By being fitted yield, it being finally inversed by conductivity, wherein conductivity is the characterization parameter of interwell communication degree,
The dynamic indicator prediction model are as follows:
Wherein, in above-mentioned model, TijFor the conductivity between i-th mouthful of well and jth mouth well；μiFor viscosity of crude；piAnd pj
The respectively bottom pressure of i-th mouthful of well and jth mouth well；qiFor i-th mouthful of well yield；CtFor system compressibility；VpiIt is i-th mouthful
The control volume of well；P controls the average pressure of volume between well；T is the time.
According to the model and by fitting yield, it is finally inversed by conductivity, which is that the characterization of interwell communication degree is joined
Number, to calculate separately out connecting degree between the injection-production well of each initial injection-production program.
Further, according to connecting degree between the injection-production well of calculated each initial injection-production program, note is drawn respectively and is adopted
The Lorentz curve of interwell communication degree, to obtain the Gini coefficient.In the present embodiment, as shown in figure 3, drawing Lip river
Human relations hereby curve when, first, in accordance with the ascending arrangement of connecting degree, abscissa is well to accumulative perception, and ordinate is connection journey
It spends accumulative perception (Fig. 3).Compare the Gini coefficient of connecting degree between injection-production well in different initial schemes, wherein Gini coefficient
Area (Fig. 2 dash area) is surrounded for curve and diagonal line.Area is smaller, then Gini coefficient is smaller.
Select the smallest initial scheme of Gini coefficient for final flooding pattern scheme.It injects water and splits component in different directions
It is related (formula 2) with connecting degree between injection-production well and injection production pressure difference.Gini coefficient is the non-homogeneous degree for characterizing connecting degree,
Gini coefficient is smaller, and connecting degree distribution is more uniform, and it is more uniform to split component for all directions under identical injection production pressure difference, and all directions are driven
For more balanced, injection water is avoided mainly to alter to be formed along high flow-guiding channel and unidirectionally imitated, to improve the sweep efficiency of injection water.
Formula (2) as follows,
Qi=Ji×(p-pi) (2)
In above-mentioned formula (2), QiInjection water for water injection well in the direction producing well i splits component, m3；P is water injection well shaft bottom stream
Pressure, MPa；piFor producing well i flowing bottomhole pressure (FBHP), MPa.
The present invention is the optimization design carried out on the basis of initial well pattern construction method.Compared with the existing technology, it not only examines
Consider injection-production well and bore the Reservoir Body type met, the condition of production of well, while considering interwell communication degree.Select interwell communication degree base
The smallest scheme of Buddhist nun's coefficient as injection-production program, avoid injection water along high flow-guiding channel alter so that caused by unidirectionally imitated, from
And improve the sweep efficiency of injection water.
In one embodiment, by taking certain domestic oil field block as an example, fracture-pore reservoir space structure of the invention is illustrated
Flooding pattern optimum design method, the block share five mouthfuls of wells: being respectively well P1, well P2, well P3, well W1 and well W2 (referring to figure
4)。
Firstly, determining initial injection-production program according to " low note height, which adopts, stitches note hole adopts " and the condition of production of well.Well P1, well
P2, well P3, well W2, which are bored, meets Caves Reservoir Body, and JingW1Jing, which is bored, meets slit formation Reservoir Body.Well P1 daily oil production 27m3, aqueous
36%, well P2 daily oil production 42m3, aqueous 28%, well P3 daily oil production 38m3, aqueous 35%, it opens between well W1 High water cut, well W2 days
Oil production 0.89t, it is not aqueous.Comprehensively considered according to mentioned above principle two initial schemes have been determined, is respectively as follows: the water filling of W1 well
(initial scheme one) and W2 well fill the water (initial scheme two).
Connecting degree between the injection-production well of two schemes, connecting degree such as table 1 between injection-production well are calculated separately according to above-mentioned model
It is shown.
Connecting degree calculated result between 1 initial scheme injection-production well of table
According to connecting degree between the injection-production well of calculated each initial injection-production program, journey is connected between drafting injection-production well respectively
The Lorentz curve of degree to obtain the Gini coefficient, and compares connecting degree Gini coefficient between different schemes injection-production well.?
In the present embodiment, by attached drawing 5 it can be found that two Gini coefficient of scheme is greater than one Gini coefficient of scheme.Show that scheme two is connected to
Degree heterogeneity is strong.Therefore selecting scheme one is well pattern final design scheme, i.e. well W1 water filling is final scheme.
In fracture-pore reservoir space structure flooding pattern optimum design method of the invention, this method is according to connecting degree
Preferred embodiment selects the smallest scheme of interwell communication degree Gini coefficient as injection-production program, avoids injection water along high water conservancy diversion
Channel is unidirectionally imitated caused by altering in turn, improves the sweep efficiency of injection water.
Claims (9)
1. a kind of fracture-pore reservoir space structure flooding pattern optimum design method, which is characterized in that have in the block of oil field
Multiple wells, the fracture-pore reservoir space structure flooding pattern optimum design method comprising steps of
S1): multiple initial injection-production programs are determined according to the type of the position of each mouth well or the Reservoir Body of each mouth well；
S2): calculating separately connecting degree between the injection-production well of each initial injection-production program；
S3): according to connecting degree between the injection-production well of each initial injection-production program, calculating separately the Geordie of connecting degree between injection-production well
Coefficient；
S4): selecting the smallest initial injection-production program of Gini coefficient as final injection-production program.
2. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1, which is characterized in that
Step S3) in, according to connecting degree between the injection-production well of each initial injection-production program, the Lip river of connecting degree between injection-production well is drawn respectively
Human relations hereby curve, to obtain the Gini coefficient.
3. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1 or 2, feature exist
In determining multiple initial injection-production programs according to " low note height is adopted " principle in step S1).
4. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1 or 2, feature exist
In in step S1), additionally it is possible to true according to " moisture content is greater than 98% or oil production is less than the well of 1t/d as water injection well " principle
Fixed multiple initial injection-production programs.
5. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1 or 2, feature exist
According to " well of slit formation Reservoir Body is that the well of water injection well and slit formation Reservoir Body is the well of water injection well and Caves Reservoir Body
For producing well " principle determines multiple initial injection-production programs.
6. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1, which is characterized in that
In step S1, in multiple initial injection-production programs, select wherein a well in the multiple wells as water injection well respectively, it is described
Other wells in multiple wells are as producing well.
7. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1 or 2, feature exist
In, in step S2), based on conductivity and control volume establish dynamic indicator prediction model and by fitting yield, inverting
Conductivity out, wherein conductivity is the characterization parameter of interwell communication degree,
The dynamic indicator prediction model are as follows:
Wherein, TijFor the conductivity between i-th mouthful of well and jth mouth well；
μiFor viscosity of crude；
piAnd pjThe respectively bottom pressure of i-th mouthful of well and jth mouth well；
qiFor i-th mouthful of well yield；
CtFor system compressibility；
VpiFor the control volume of i-th mouthful of well；
P controls the average pressure of volume between well；
T is the time.
8. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 1, which is characterized in that
There are five mouthfuls of wells in the block of oil field.
9. fracture-pore reservoir space structure flooding pattern optimum design method according to claim 8, which is characterized in that
In step S1, in multiple initial injection-production programs, select a well in five mouthfuls of wells as water injection well respectively, other four mouthfuls
Well is as producing well.
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| CN113032996A (en) * | 2021-03-25 | 2021-06-25 | 长江大学 | Water channeling channel identification method for low-permeability fractured reservoir horizontal well |
| CN113032996B (en) * | 2021-03-25 | 2022-06-21 | 长江大学 | Water channeling channel identification method for hypotonic fractured reservoir horizontal well |
| CN113605875A (en) * | 2021-08-31 | 2021-11-05 | 中国石油大学(北京) | Well pattern construction method, device and medium for fracture-cavity oil reservoir |
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