CN103867175A - Steam-driving well network structure and steam-driving developing method thereof - Google Patents
Steam-driving well network structure and steam-driving developing method thereof Download PDFInfo
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Abstract
The invention discloses a steam-driving well network structure which at least comprises one injection-production well set, wherein the injection-production well set comprises a steam injection well and a production well set; the injection-production well set at least comprises one steam injection well; the steam injection well is located at the center of the production well set; the injection-production well set at least comprises one production well set; the production well set comprises a first well network unit and a second well network unit; the first well network unit is embedded in the second well network unit; a steam-driving well network wholly has a double-loop structure. The invention also discloses a steam-driving developing method applied to the steam-driving well network structure. After an internal and external embedded double-loop steam-driving well network structure and the steam-driving developing method are adopted for performing steam-driving development on oil deposit, the steam wave and volume can be increased, so that the oil steam ratio of a steam-driving developing mode is increased, and the developing cost is lowered.
Description
Technical field
The present invention relates to the technology that a kind of heavy crude reservoir improves recovery ratio, a kind of particularly steam flooding well web frame and steam drive development method thereof.
Background technology
In the process of heavy crude reservoir exploitation, generally first develop by steam soak, first inject a certain amount of steam to oil well, closing well a period of time, after the heat energy of steam spreads to oil reservoir, then opening well and making production.But in described steam soak development process, because underground viscosity of crude is high, the resistance that the steam of injection oil reservoir is subject to high viscosity oil is larger, make steam be difficult to enter oil reservoir deep and heat large-scale oil reservoir, thereby the mode of described steam soak can only each oil well well point of extraction near crude oil in oil reservoir, be difficult to reserves between well effectively to be employed, leave a large amount of regions of bypassed oil between well, general oil recovery factor is only 10% to 20%.
For further improving oil recovery factor in the described thermal recovery stage, generally after cyclic steam stimulation, then adopt steam driving exploitation technology to exploit at heavy crude reservoir.While adopting described steam driving exploitation technology, inject continuously high-quality steam by Injection Well, inject a large amount of heat energy heating oil reservoirs of oil reservoir, thereby greatly reduce viscosity of crude, and crude oil is urged to producing well extraction around by the hot fluid injecting, by more extraction crude oil.The described steam driving exploitation that carries out after cyclic steam stimulation can make oil recovery factor increase by 20% to 30%.Described steam driving exploitation mode has broad application prospects in heavy oil development, is a very potential development scheme of tool.
At present for Homogeneous Reservoir, when oil reservoir in the plane all directions permeability contrast hour, the well pattern structure that the described steam soak stage adopts is generally the square well pattern structure that well spacing equates.When described steam soak, the well pattern structure of employing comprises five-spot pattern.Described five-spot pattern is the most basic square well pattern structure.As shown in Figure 1, described five-spot pattern comprises a steam injection well 1 and four corner wells 21.Described steam injection well 1 is positioned at four corner well 21 centers.Because described steam driving exploitation technology is to carry out on the basis of steam soak, therefore described steam driving exploitation technology is also conventionally take square well pattern structure as basis.
The square well pattern structure adopting in described steam driving exploitation technology specifically comprises: anti-seven spot pattern, inverted nine-spot pattern.Take China scale implement steam flooding neat 40 as example, what it adopted is inverted nine-spot pattern.Described inverted nine-spot pattern as shown in Figure 2, comprising: steam injection well 1, producing well: corner well 21, end hole 22.Described steam injection well 1 is for to oil reservoir steam injection.Described corner well 21 and end hole 22 are for recovering the oil.Described steam injection well 1 is positioned at center, on the square centered by described steam injection well 1, four corner wells 21 and four end holes 22 is set.
Above-mentioned square well pattern structure is mainly to design for the oil reservoir of relative homogeneous, and take inverted nine-spot pattern as example, when steam is from steam injection well 1 injects, the fluid of injection can be to external expansion as a circle constantly evenly expanding.In the situation that injecting fluid well-distributing expansion, because steam injection well 1 is apart from the near distance of end hole 22, therefore steam outer rim preferentially arrives end hole 22 places, and the steam of injection is from end hole 22 extraction.After described steam is adopted from end hole 22, form steam and break through, between injection-production well, just formed note and adopted passage.When occurring after the situation of described steam breakthrough, if rethink adjustment steam flow, make it flow to corner well 22 just very difficult.Described steam swept volume is little, does not involve to corner well 22 places, so just causes corner well 22 places can not adopt oil, corner well 22 liquid-producing capacities as producing well are inadequate, thereby cause the steam swept volume of described well pattern structure little, the oil of output is low with the ratio of the amount of the vapour of injection, and gas oil ratio is low.
Summary of the invention
The object of this invention is to provide a kind of steam flooding well web frame and steam drive development method thereof, to improve steam drive development mode gas oil ratio.
Above-mentioned purpose of the present invention can adopt following technical proposal to realize:
A kind of steam flooding well web frame, described steam flooding well web frame at least comprises an injection-production well group, wherein,
Described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group;
Described injection-production well group at least comprises that is produced a well group, described production well group comprises: the first element pattern, the second element pattern, described the first element pattern and the second element pattern entirety are all square, and described the first element pattern is nested in the inside of described the second element pattern, described steam flooding well pattern entirety is hollow structure; On the square sideline at the place, unit of described the first element pattern and the second well pattern, be provided with producing well.
In a preferred embodiment, on described the first element pattern and the foursquare angle of the second element pattern, be provided with corner well, on described the first element pattern and/or the foursquare limit of the second element pattern, be evenly provided with end hole.
In a preferred embodiment, described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
A kind of steam drive development method, comprises the following steps:
S1: the dynamic and static state parameters that obtains oil reservoir;
S2: according to the parameter of obtaining in S1, the selected oil reservoir that meets steam drive development condition, described exploitation condition comprises:
Core intersection >=20 meter, thickness in monolayer >=5 meter, clean gross thickness is than > 0.4, remaining oil saturation >=0.45, degree of porosity >=0.2, permeability >=200 millidarcy, degassed crude viscosity < 20000 milli handkerchief second under formation condition, 1600 meters of reservoir depth <;
S3: the well pattern parameter of determining the oil reservoir that meets steam drive development condition described in S2;
S4: according to well pattern parameter definite in S3, utilize numerical reservoir simulation method to determine that optimum steam flooding hollow well pattern structure and the note thereof of described oil reservoir adopt parameter;
S5: on the described well pattern structure basis of determining in S4, utilize numerical reservoir simulation method to determine its steam drive development process.
In a preferred embodiment, described in S2, select while meeting the oil reservoir of steam drive development condition, the well spacing of described oil reservoir is 70 meters to 105 meters.
In a preferred embodiment, the parameter of well pattern described in S3 comprises: well spacing, pattern area, core intersection.
In a preferred embodiment, the steam flooding hollow well pattern structure described in S4 at least comprises an injection-production well group, wherein,
Described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group;
Described injection-production well group at least comprises that is produced a well group, and described production well group comprises: the first element pattern, the second element pattern, and described the first element pattern is nested in the inside of described the second element pattern, and described steam flooding well pattern entirety is hollow structure.
In a preferred embodiment, described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
In a preferred embodiment, note described in S4 is adopted parameter and is comprised: steam injection speed, steam injection well shaft bottom mass dryness fraction, production-injection ratio, wherein said steam injection speed range is 1.0 to 1.8 tons of/day hectare rice, and described steam injection well shaft bottom mass dryness fraction scope is 0.1 to 0.8, and described production-injection ratio scope is 0.9 to 1.4.
In a preferred embodiment, the process of steam drive development described in S5 comprises constant steam injection rate exploitation and changes steam injection rate exploitation.
The features and advantages of the invention are: the present invention proposes a kind of steam flooding well web frame, by described steam flooding well web frame is noted to the square well pattern structure process reasonable Arrangement that well number is lower by original adopting, change a kind of higher inside and outside nested hollow well pattern structure of note well number of adopting of the present invention into.And on the basis of described hollow well pattern structure, in conjunction with the development approach that the present invention proposes a kind of steam flooding, while being applied in the oil field of steam soak, can improve described steam flooding well group adopt note well count ratio, expand steam swept volume, improve gas oil ratio, reduce development cost.
Accompanying drawing explanation
Fig. 1 is five-spot pattern schematic diagram in prior art;
Fig. 2 is inverted nine-spot pattern schematic diagram in prior art;
Fig. 3 is anti-interior 5 outer nine-spot pattern schematic diagrames in the embodiment of the present invention;
Fig. 4 is anti-interior 5 outer ten three well pattern schematic diagrames in the embodiment of the present invention;
Fig. 5 is anti-interior 9 outer ten seven spot pattern schematic diagrames in the embodiment of the present invention;
Fig. 6 is the flow chart of a kind of steam drive development method in the embodiment of the present invention;
Fig. 7 is that in the embodiment of the present invention, the anti-interior nine-spot pattern of steam soak is converted to the schematic diagram before anti-interior 5 outer ten three well patterns of steam flooding;
Fig. 8 is that in the embodiment of the present invention, the anti-interior nine-spot pattern of steam soak is converted to the schematic diagram in anti-interior 5 outer ten three well patterns of steam flooding;
Fig. 9 is that in the embodiment of the present invention, the anti-interior nine-spot pattern of steam soak is converted to the schematic diagram after anti-interior 5 outer ten three well patterns of steam flooding.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme of the present invention is elaborated, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall in the application's claims limited range the modification of the various equivalent form of values of the present invention.
The present invention proposes a kind of steam flooding well web frame, described steam flooding well web frame at least comprises an injection-production well group.Wherein, described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group.Described injection-production well group at least comprises that is produced a well group, and described production well group comprises: the first element pattern, the second element pattern.Described the first element pattern and the second element pattern entirety are all square, and described the first element pattern is nested in the inside of described the second element pattern, and described steam flooding well pattern entirety is hollow structure.On the square sideline at the place, unit of described the first element pattern and the second well pattern, be provided with producing well.On described the first element pattern and the foursquare angle of the second element pattern, be provided with corner well, on described the first element pattern and/or the foursquare limit of the second element pattern, be evenly provided with end hole.
Described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
As shown in Figure 3, described steam injection well 1 is positioned at the center of square well pattern to described anti-interior 5 outer nine-spot pattern structures, and the first element pattern A is set centered by described steam injection well 1.Described the first element pattern A is square, on foursquare four summits, four corner wells 21 is set.
In the periphery of described the first element pattern A, be provided with the second element pattern B, described the second element pattern B is also centered by steam injection well 1.Described the second element pattern B is also square, and it arranges four corner wells 21 on foursquare each summit, at the mid point of described square four edges line, four end holes 22 is set.
As shown in Figure 4, described steam injection well 1 is positioned at the center of square well pattern to described anti-interior 5 outer ten three well pattern structures, and the first element pattern A is set centered by described steam injection well 1.Described the first element pattern A is square, on foursquare four summits, four corner wells 21 is set.
In the periphery of described the first element pattern A, be provided with the second element pattern B, described the second element pattern B is also centered by steam injection well 1.Described the second element pattern B is also square, and it arranges four corner wells 21 on foursquare each summit, on every sideline of described square 2 end holes 22 is evenly set.
As shown in Figure 5, described steam injection well 1 is positioned at the center of square well pattern to described anti-interior 9 outer ten seven spot pattern structures, and the first element pattern A is set centered by described steam injection well 1.Described the first element pattern A is square, on foursquare four summits, four corner wells 21 is set, and at the mid point of described square four edges line, four end holes 22 is set.
In the periphery of described the first element pattern A, be provided with the second element pattern B, described the second element pattern B is also centered by steam injection well 1.Described the second element pattern B is also square, and it arranges four corner wells 21 on foursquare each summit, on every sideline of described square 3 end holes 22 is evenly set.
As shown in Figure 5, take anti-interior 9 outer ten seven spot pattern structures as example, wherein d
o1for steam injection well 1 and the well spacing of end hole 22 that is positioned at outer field the second element pattern B, d
o2for steam injection well 1 and the well spacing of corner well 21 that is positioned at outer field the second element pattern B.D
i1for steam injection well 1 and the well spacing of end hole 22 of the first element pattern A that is positioned at internal layer, d
i2for steam injection well 1 and the well spacing of corner well 21 of the first element pattern A that is positioned at internal layer.
Inside and outside nested hollow well pattern structure of the present invention, be not limited to above-mentioned anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer three kinds of structures of ten seven spot patterns, thereby can be out of shape accordingly the inside and outside nested hollow well pattern structure that obtains other according to actual conditions.
The present invention is directed to the development approach that described hollow well pattern structure has also proposed a kind of steam flooding.As shown in Figure 6, be the flow chart of a kind of steam drive development method in the embodiment of the present invention.Described steam drive development method comprises the following steps:
S1: the dynamic and static state parameters that obtains oil reservoir;
S2: according to the parameter of obtaining in S1, the selected oil reservoir that meets steam drive development condition, described exploitation condition comprises:
Core intersection >=20 meter, thickness in monolayer >=5 meter, clean gross thickness is than > 0.4, remaining oil saturation >=0.45, degree of porosity >=0.2, permeability >=200 millidarcy, degassed crude viscosity < 20000 milli handkerchief second under formation condition, 1600 meters of reservoir depth <;
S3: the well pattern parameter of determining the oil reservoir that meets steam drive development condition described in S2;
S4: according to well pattern parameter definite in S3, utilize numerical reservoir simulation method to determine that optimum steam flooding hollow well pattern structure and the note thereof of described oil reservoir adopt parameter;
S5: on the described well pattern structure basis of determining in S4, utilize numerical reservoir simulation method to determine its steam drive development process.
Wherein, in described S1, obtain the dynamic and static state parameters of oil reservoir, be generally the dynamic and static state parameters obtaining through steam soak stage oil reservoir, described parameter comprises: core intersection, thickness in monolayer, clean gross thickness ratio, remaining oil saturation, degree of porosity, permeability, degassed crude viscosity under formation condition, reservoir depth and well pattern structure, well spacing and recovery ratio.
Described in S2, select while meeting the oil reservoir of steam drive development condition, the preferential oil reservoir of selecting 70 meters to 105 meters well spacings square well pattern cyclic steam stimulations of employing to cross, and described steam soak stage recovery ratio is 20% to 40%.In the time that oil reservoir well spacing leaved for development is greater than 105 meters, can, by the mode of encrypting, well spacing be encrypted within the scope of 70 meters to 105 meters well spacings.
The parameter of well pattern described in S3 comprises: well spacing, pattern area, core intersection.Wherein said pattern area is defined as and is positioned at the element pattern area that outer field the second element pattern B controls, that is:
S=4d
o1*d
o1
Core intersection is defined as the interior statistics of the cellar area oil reservoir average thickness that every kind of well pattern form is controlled.Core intersection is the actual parameter recording, and is known quantity.
Steam flooding hollow well pattern structure described in S4 at least comprises an injection-production well group, wherein,
Described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group.Described injection-production well group at least comprises that is produced a well group, and described production well group comprises: the first element pattern, the second element pattern, and described the first element pattern is nested in the inside of described the second element pattern, and described steam flooding well pattern entirety is hollow structure.
Described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
Note described in S4 is adopted parameter and is comprised: steam injection speed, steam injection well shaft bottom mass dryness fraction, production-injection ratio, and wherein said steam injection speed range is 1.0 to 1.8 tons of/day hectare rice, and described steam injection well shaft bottom mass dryness fraction scope is 0.1 to 0.8, and described production-injection ratio scope is 0.9 to 1.4.
The process of steam drive development described in S5 comprises constant steam injection rate exploitation and changes steam injection rate exploitation.
Due to steam flooding well web frame of the present invention, be inside and outside nested hollow well pattern structure, it can improve the production-injection ratio of steam drive development mode, expands steam swept volume, reduces development cost simultaneously.
Utilize steam flooding hollow well pattern structure described in the embodiment of the present invention below and the development process of described steam flooding hollow well pattern is described in conjunction with a kind of steam flooding well pattern development approach described in the embodiment of the present invention.
Steam flooding hollow well pattern structure of the present invention has been applied to the test of Block Jingzhou 45 in Liaohe steam flooding.Described Oilfield using to be flooding pattern be transformed to anti-interior 5 outer ten three well pattern structures in steam flooding stage by the inverted nine-spot pattern in steam soak stage.As shown in Figure 4, described steam injection well 1 is positioned at the center of square well pattern to described anti-interior 5 outer ten three well pattern structures, and the first element pattern A is set centered by described steam injection well 1.Described the first element pattern A is square, on foursquare four summits, four corner wells 21 is set.
In the periphery of described the first element pattern A, be provided with the second element pattern B, described the second element pattern B is also centered by steam injection well 1.Described the second element pattern B is also square, and it arranges four corner wells 21 on foursquare each summit, on every sideline of described square 2 end holes 22 is evenly set.
The process of the described well pattern that is transferred to anti-interior 5 outer ten three of steam flooding by steam soak inverted nine-spot pattern as shown in Figure 7 to 9.Fig. 7 is that the anti-interior nine-spot pattern of steam soak is converted to the schematic diagram before anti-interior 5 outer ten three well patterns of steam flooding.First from described inverted nine-spot pattern, find element pattern as shown in Figure 7; Then increase a new steam injection well 1 at the element pattern center of finding, as shown in Figure 8; Finally by the producing well of changing into that was originally steam injection well, as shown in Figure 9.Described by the structure of anti-interior nine-spot pattern of steam soak stage, only needing increases a steam injection well, is convertible into the well pattern structure of anti-interior 5 outer ten three of described steam-stimulated well, the investment of greatly having saved the new well of many brills.
While utilizing in addition described steam flooding hollow well pattern to carry out steam drive development, its detailed process is as follows:
First obtain the dynamic and static state parameters of oil reservoir.Described moving static data specifically refers to the dynamic and static state parameters through steam soak stage oil reservoir, described parameter comprises: core intersection, thickness in monolayer, clean gross thickness ratio, remaining oil saturation, degree of porosity, permeability, degassed crude viscosity under formation condition, reservoir depth and well pattern structure, well spacing and recovery ratio.
According to the described parameter of obtaining, the selected oil reservoir that meets steam drive development condition, described exploitation condition comprises: core intersection >=20 meter, thickness in monolayer >=5 meter, clean gross thickness is than > 0.4, remaining oil saturation >=0.45, degree of porosity >=0.2, permeability >=200 millidarcy, degassed crude viscosity < 20000 milli handkerchief second under formation condition, 1600 meters of reservoir depth <.
The oil reservoir that adopts 70 meters to 105 meters well spacings square well pattern cyclic steam stimulations to cross, and described in the stage recovery ratio of handling up be 20% to 40%.
Then utilize numerical reservoir simulation method to determine the described steam flooding well network parameters meeting in steam drive development oil reservoir plane.Described well pattern parameter comprises: well spacing, pattern area, core intersection.
Further, according to well pattern parameters such as the well spacing forming, pattern area, core intersections, utilize numerical reservoir simulation method preferably inside and outside three kinds the note such as the best steam injection speed of nested hollow well pattern form, steam injection well shaft bottom mass dryness fraction, production-injection ratio adopt parameter, determine optimum well pattern form, and then the steam drive development process under optimum well pattern form is optimized.
Described numerical reservoir simulation method is a kind of conventional method of oil field development, normally realizes the exploitation simulation of oil reservoir under specified criteria based on computer software.Described exploitation matching is set up reservoir numerical simulation model and carry out history matching for production based on above-mentioned inside and outside nested hollow well pattern form, optimizes the note such as best steam injection speed, steam injection well shaft bottom mass dryness fraction, production-injection ratio of every kind of well pattern form and adopts parameter.Wherein said steam injection speed preferable range is 1.0 to 1.8 tons of/day hectare rice, and steam injection well shaft bottom mass dryness fraction preferable range is 0.1 to 0.8, and production-injection ratio preferable range is 0.9 to 1.4.In described steam drive development process, to tire out produce oil, stage recovery percent of reserves, rate of oil production as technical indicator, take gas oil ratio, the tired produce oil of unit reserves, clean produce oil as economic indicator, the note that contrasts every kind of well pattern form the best is adopted technology and the economic indicator under parameter, obtains optimum well pattern structure.
Determining after optimum well pattern structure, utilize numerical reservoir simulation method to determine optimal planar well pattern steam drive development process.When concrete operations, first according to the situation such as pressure, hole condition that proceeds to steam drive reservoir, determine the individual well day liquid-producing capacity of oil well; Then according to described liquid-producing capacity, according to the method for " determining vapour with liquid ", design the steam injection amount at steam flooding initial stage; Then according to different steam injection amount steam flooding schemes, the thermal field of reservoir numerical simulation oil reservoir, pressure field and three variations of saturation field, take high gas oil ratio as target, adjust steam injection parameter, producing zone position, vapour in good time and alter the dosing again of plugged well; After steam flooding gas oil ratio is lower than economic limit gas oil ratio, scheme stops.Finally contrast technology and the economic indicator of different steam flooding process schemes, take the steam drive development scheme of higher steam flooding stage recovery percent of reserves and the highest gas oil ratio as optimal case.
By applying steam flooding hollow well pattern structure of the present invention, be combined with steam flooding well pattern development approach of the present invention, can, by the adopting more than note well number brings up to 7:1 than from the 3:1 of inverted nine-spot pattern of steam flooding well pattern, effectively raise in steam flooding implementation process and adopt and note well number than low problem.Particularly in the time that in described well pattern structure, the interior lines well generation vapour as the first element pattern A is altered, can be by the method for described reservoir numerical simulation, judge that by field pattern and well yield which mouthful well vapour has occurred and altered, or have vapour to alter possibility in which direction, and then adjust accordingly.Described adjustment specifically refers to by observing field pattern to judge which layer, and vapour has occurred the well of which direction alters, and then sealing is carried out in the layer position that generation vapour is altered.Carrying out after described sealing operation, the described producing well production fluid by sealing reduces, and now can, its production fluid amount of dispensing, be fitted on according to field pattern the well that steam involves poor direction.By adjusting fluid producing layer position and the production fluid amount of described producing well, can control steam propagation direction, reach and increase steam swept volume, improve the object of gas oil ratio.
By described steam flooding hollow well pattern structure after described trial zone is implemented, the production-injection ratio in described oil field rises to 1.2 by 1.0, and gas oil ratio is increased to 0.18 by 0.12, and steam swept volume is extended to 50% by 30%, improve significantly steam drive development effect, reduced cost of winning.Described steam flooding well web frame solves that after end hole in existing steam flooding technology is broken through, to be difficult to adjust the steam swept volume causing little effectively, the low problem of steam driving exploitation gas oil ratio finally causing.
The foregoing is only several embodiments of the present invention, although the disclosed embodiment of the present invention as above, the embodiment that described content just adopts for the ease of understanding the present invention, is not intended to limit the present invention.Any those skilled in the art; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can in the formal and details of embodiment, do any modification and variation; but scope of patent protection of the present invention, still must be as the criterion with the scope that appended claims was defined.
Claims (10)
1. a steam flooding well web frame, is characterized in that: described steam flooding well web frame at least comprises an injection-production well group, wherein,
Described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group;
Described injection-production well group at least comprises that is produced a well group, described production well group comprises: the first element pattern, the second element pattern, described the first element pattern and the second element pattern entirety are all square, and described the first element pattern is nested in the inside of described the second element pattern, described steam flooding well pattern entirety is hollow structure; On the square sideline at the place, unit of described the first element pattern and the second well pattern, be provided with producing well.
2. steam flooding well web frame as claimed in claim 1, it is characterized in that: on described the first element pattern and the foursquare angle of the second element pattern, be provided with corner well, on described the first element pattern and/or the foursquare limit of the second element pattern, be evenly provided with end hole.
3. steam flooding well web frame as claimed in claim 1, is characterized in that, described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
4. a steam drive development method, is characterized in that, comprises the following steps:
S1: the dynamic and static state parameters that obtains oil reservoir;
S2: according to the parameter of obtaining in S1, the selected oil reservoir that meets steam drive development condition, described exploitation condition comprises:
Core intersection >=20 meter, thickness in monolayer >=5 meter, clean gross thickness is than > 0.4, remaining oil saturation >=0.45, degree of porosity >=0.2, permeability >=200 millidarcy, degassed crude viscosity < 20000 milli handkerchief second under formation condition, 1600 meters of reservoir depth <;
S3: the well pattern parameter of determining the oil reservoir that meets steam drive development condition described in S2;
S4: according to well pattern parameter definite in S3, utilize numerical reservoir simulation method to determine that optimum steam flooding hollow well pattern structure and the note thereof of described oil reservoir adopt parameter;
S5: on the described well pattern structure basis of determining in S4, utilize numerical reservoir simulation method to determine its steam drive development process.
5. a kind of steam drive development method as claimed in claim 4, is characterized in that: described in S2, select while meeting the oil reservoir of steam drive development condition, the well spacing of described oil reservoir is 70 meters to 105 meters.
6. a kind of steam drive development method as claimed in claim 4, is characterized in that, the parameter of well pattern described in S3 comprises: well spacing, pattern area, core intersection.
7. a kind of steam drive development method as claimed in claim 4, is characterized in that: the steam flooding hollow well pattern structure described in S4 at least comprises an injection-production well group, wherein,
Described injection-production well group at least comprises a steam injection well, and described steam injection well location is in the center of described production well group;
Described injection-production well group at least comprises that is produced a well group, and described production well group comprises: the first element pattern, the second element pattern, and described the first element pattern is nested in the inside of described the second element pattern, and described steam flooding well pattern entirety is hollow structure.
8. a kind of steam drive development method as claimed in claim 7, is characterized in that, described steam flooding well web frame comprises: anti-interior 5 outer nine-spot patterns, anti-interior 5 outer ten three well patterns and anti-interior 9 outer ten seven spot patterns.
9. a kind of steam drive development method as claimed in claim 4, it is characterized in that, note described in S4 is adopted parameter and is comprised: steam injection speed, steam injection well shaft bottom mass dryness fraction, production-injection ratio, wherein said steam injection speed range is 1.0 to 1.8 tons of/day hectare rice, described steam injection well shaft bottom mass dryness fraction scope is 0.1 to 0.8, and described production-injection ratio scope is 0.9 to 1.4.
10. a kind of steam drive development method as claimed in claim 4, is characterized in that: the process of steam drive development described in S5 comprises constant steam injection rate exploitation and changes steam injection rate exploitation.
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| CN106368665A (en) * | 2015-07-20 | 2017-02-01 | 中国石油天然气股份有限公司 | Dual-horizontal well pattern applied to thick oil and exploitation method for thick oil |
| CN107435535A (en) * | 2016-05-26 | 2017-12-05 | 中国石油大学(北京) | A kind of method that exploitation high dip angle heavy crude reservoir is driven using plane gravity |
| CN108019194A (en) * | 2016-11-02 | 2018-05-11 | 中国石油化工股份有限公司 | The method that more well linkage steam injections improve development result of heavy oil reservoirs |
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| CN112983387B (en) * | 2019-12-18 | 2022-12-02 | 中国石油天然气股份有限公司 | Injection and production well pattern deployment method and injection and production well pattern |
| CN112983387A (en) * | 2019-12-18 | 2021-06-18 | 中国石油天然气股份有限公司 | Injection and production well pattern deployment method and injection and production well pattern |
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| CN113622885B (en) * | 2020-05-08 | 2023-02-07 | 中国石油天然气股份有限公司 | Layered injection-production method for improving recovery ratio through gas injection |
| CN114592838A (en) * | 2020-12-04 | 2022-06-07 | 中国石油天然气股份有限公司 | Method and system for evaluating steam flooding potential of layered super heavy oil reservoir |
| CN114592838B (en) * | 2020-12-04 | 2023-08-22 | 中国石油天然气股份有限公司 | Layered super heavy oil reservoir steam flooding potential evaluation method and system |
| CN112796745B (en) * | 2021-02-18 | 2022-10-11 | 中海油田服务股份有限公司 | Method and device for determining production dynamic data of steam flooding oil reservoir |
| CN112796745A (en) * | 2021-02-18 | 2021-05-14 | 中海油田服务股份有限公司 | Method and device for determining production dynamic data of steam flooding oil reservoir |
| CN113919135A (en) * | 2021-09-10 | 2022-01-11 | 中国海洋石油集团有限公司 | Steam drive steam channeling early warning mechanism and steam channeling treatment method for offshore large-well-spacing horizontal well |
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