CN106639996A - Method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding - Google Patents
Method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding Download PDFInfo
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- CN106639996A CN106639996A CN201611046603.0A CN201611046603A CN106639996A CN 106639996 A CN106639996 A CN 106639996A CN 201611046603 A CN201611046603 A CN 201611046603A CN 106639996 A CN106639996 A CN 106639996A
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- volume fracturing
- producing well
- water injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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 DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Abstract
The invention relates to a method for developing ultra-low permeability reservoir by combining vertical well volume fracturing and line flooding. The method at least comprises the following steps that 1, a rectangular five-spot flood system is formed, oil production lines and water injection lines are formed in the rectangular five-spot flood system, the oil production lines and the water injection lines are mutually parallel and arranged in a staggered mode, and the extension direction of the oil production lines and the water injection lines is parallel to the maximum parallel principal stress direction; 2, volume fracturing is conducted on production wells and water injection wells in sequence, injection of flow lines between the oil production lines and the water injection lines is made to form a straight line on a horizontal plane. The flow lines are water flooding flow lines, namely, water flooding channels, formed between the water injection lines and the oil production lines. According to the method, an efficient driving system is established between the water injection lines and the oil production lines, the water injection capacity is enhanced, the oil well single well yield is greatly increased, and the oil production rate and the final water flooding recovery efficiency are increased.
Description
Technical field
The present invention is more particularly to a kind of straight well volume fracturing and wire with regard to a kind of development approach of extra-low-permeability reservoir
The method of water filling combination and exploitation extra-low-permeability reservoir.
Background technology
Extra-low-permeability reservoir refers to the oil reservoir of the ground level air infiltration rate less than 1.0mD of reservoir.With newfound middle and high
The reduction of infiltration oil reservoir (ground level air infiltration rate is more than 50mD) quantity, extra-low-permeability reservoir has been increasingly becoming main oil gas
Resource.Because super-low permeability reservoir has the features such as porosity is low, permeability is low, pore throat is tiny, displacement difficulty is big, such is caused
Oil reservoir development difficulty is big, energy supplement is difficult, development degree is low, deficiency in economic performance the problems such as.Extra-low-permeability reservoir exploitation at present
The straight well well pattern structure generally adopted using the anti-9 points of notes of rhombus.Referring to Fig. 3, a unit of anti-9 flooding patterns of rhombus includes
There is Jiu Koujing, wherein there are eight mouthfuls of wells to form a rhombus, another mouthful of well location is in the center of rhombus；Positioned at a bite well at rhombus center
It is corner well (producing well) positioned at four mouthfuls of wells of four corner locations of rhombus for water injection well, positioned at rhombus when four mouthfuls of upper wells are
Well (producing well).Producing well adopts conventional manual's pressure break mode, the development scheme of water injection well not pressure break；Conventional manual's pressure break mode
It is (less than 4m using small displacement3/ min) and low consumption of the liquid (be less than 100m3) pressure break reservoir improvement mode, can only be along most flood
Flat principal direction of stress (being determined by the geological conditions of oil reservoir) forms the crack (referring to Fig. 4 A) of single direction.Opened using existing
Mode is adopted, the producing well initial stage average annual daily output is less than 2t/d, develops only 2000～3000 tons of the cumulative oil production of 10 years producing wells,
Rate of oil production is relatively low.Therefore, it is badly in need of exploring a kind of suitable for extra-low-permeability reservoir economy, rational development scheme.
And volume fracturing is that (single hop pressure break enters ground liquid measure and is more than 1000m using big liquid measure3), huge discharge (be more than 6m3/
Min), (single hop sand feeding amount is more than 50m to large sand amount3) artificial fracturing mode, it is therefore an objective to form complicated, flow conductivity and compare matrix
The fracture network system of high hundreds of times, increases reservoir improvement volume (referring to Fig. 4 B).
In addition, straight line row pattern water flooding regime in general sense, refers to that producing well row is arranged in parallel with row of water injector and hands over
Mistake deployment.Streamline between water injection well and producing well is " spindle " (referring to Fig. 5).Han Dejin et al. (Daqing hyposmosis
Reservoir waterflooding Study on adjustment technology. petroleum journal, 2007,28 (1):83-87) disclose the anti-of Fractured hyposmosis
Nine-spot pattern infilling adjustment is the research (referring to Fig. 6) of straight line row pattern water flooding regime, because artificial fracturing mode is conventional pressure break,
Scale is smaller, and crack is single and does not form network, therefore the streamline between water injection well and producing well is substantially similar with " spindle ",
The shortcoming of the mining type cathetus row pattern water flooding regime is that oil well well yield is not high, it is difficult to set up having for water injection well and end hole
Effect drive system, the degree of Water-drive control is not high, and the volume of floood conformance is relatively low, and rate of oil production is low, and ultimate recovery is relatively low.
Thus, the present inventor is by the experience of relevant industries and practice is engaged in for many years, propose a kind of straight well volume fracturing and
The method of wire water filling combination and exploitation extra-low-permeability reservoir, to overcome the defect of prior art.
The content of the invention
It is an object of the invention to provide a kind of straight well volume fracturing and wire water filling combination and exploitation extra-low-permeability reservoir
Method, between row of water injector and producing well are arranged efficient driving system is set up, and strengthens water injection capacity, greatly improves oil well individual well product
Amount, improves rate of oil production and final waterflood recovery efficiency factor.
The object of the present invention is achieved like this, and a kind of straight well volume fracturing and wire water filling combination and exploitation ultra-low penetration are oily
The method of Tibetan, the method at least comprises the steps：
Step S1, forms rectangle "five-spot" flood system, producing well row is formed with the rectangle "five-spot" flood system and is noted
Well is arranged, and makes the bearing of trend of the producing well row and the row of water injector parallel to orientation of principal stress；
Step S2, implements volume fracturing to producing well and water injection well successively, makes the producing well row and the row of water injector
Between streamline projection in the horizontal plane form straight line.
In a better embodiment of the present invention, in step sl, in the anti-9 flooding pattern bases of the rhombus developed
The rectangle "five-spot" flood system is formed on plinth.
In a better embodiment of the present invention, the producing well row of anti-9 flooding patterns of the rhombus and row of water injector
Bearing of trend parallel to orientation of principal stress, the corner well in anti-9 flooding patterns of the rhombus is changed into into water filling
Well, forms the rectangle "five-spot" flood system.
In a better embodiment of the present invention, the producing well row of anti-9 flooding patterns of the rhombus and row of water injector
Bearing of trend form an angle with orientation of principal stress, on the direction parallel with orientation of principal stress increase
If corresponding producing well or water injection well, and the corner well in anti-9 flooding patterns of the rhombus is changed into into water injection well, form institute
State rectangle "five-spot" flood system.
In a better embodiment of the present invention, in step s 2, first volume fracturing is implemented to the producing well, specifically
Step is as follows：
The fractured interval of the producing well is segmented, volume fracturing is implemented to each fractured interval, edge is formed in the horizontal plane
The slit band that the producing well row extends and is sequentially connected, the slit band has in the horizontal plane one fixed width.
In a better embodiment of the present invention, when the well spacing between the producing well is less than or equal to 300m, two
Cause for gossip is applied and be spaced between the producing well of volume fracturing the unreal producing well for applying volume fracturing of a bite.
In a better embodiment of the present invention, when the well spacing between the producing well is more than 300m, to every mouth institute
State producing well and implement volume fracturing.
In a better embodiment of the present invention, the producing well implements volume fracturing after -2 years 1 year, to the water filling
Well implements volume fracturing, comprises the following steps that：
The fractured interval of the water injection well is segmented, volume fracturing is implemented to each fractured interval, edge is formed in the horizontal plane
The slit band that the row of water injector extends and is sequentially connected, the slit band has in the horizontal plane one fixed width；In the note
The streamline for being projected as straight line in the horizontal plane is formed between the slit band of well row and the slit band of producing well row.
In a better embodiment of the present invention, after having implemented step S2, when the well head moisture content of the producing well
When reaching 80%, or the daily oil production of the producing well be less than 1t/d when, the original water injection well is changed into into producing well,
The original producing well is changed into into water injection well, reverse wire water filling is realized in reversion displacement direction；This alternating mode is carried out
At least one times.
In a better embodiment of the present invention, the well spacing between well spacing and the water injection well between the producing well
300m-500m is, the array pitch between the producing well row and the row of water injector is 80m-100m；The row of water injector splits
The width of the slit band that seamed belt is arranged with the producing well is 50m-80m.
From the above mentioned, the present invention to the development approach of extra-low-permeability reservoir by producing well arrange and row of water injector be parallel to each other and
Staggeredly dispose；Volume fracturing is implemented to producing well and water injection well；Arrange producing well and the streamline between row of water injector is in horizontal plane
On become straight line.Water injection capacity can be strengthened, oil well well yield is increased substantially.Predicted by reservoir numerical simulation, exploitation
After 15 years, recovery percent of reserves improves 4.4 percentage points, and the first five years rate of oil production can improve 0.3-0.37 percentage point, in block
Portion's earning rate can be more than more than 30%.Improve the economic benefit of rate of oil production, final waterflood recovery efficiency factor and oil reservoir development.
Description of the drawings
The following drawings is only intended in schematic illustration and explanation is done to the present invention, is not delimit the scope of the invention.Wherein：
Fig. 1：The wire water flooding regime of the rectangle "five-spot" flood system to be formed in combination and exploitation method of the present invention.
Fig. 2：For the rectangle five that formation is adjusted on the basis of anti-9 flooding patterns of rhombus in combination and exploitation method of the present invention
Point flooding pattern wire water flooding regime.
Fig. 3：The straight well well pattern structure schematic diagram adopted is noted for rhombus in prior art at anti-9 points.
Fig. 4 A：It is the crack schematic diagram formed using conventional pressure break.
Fig. 4 B：It is the crack schematic diagram formed using volume fracturing.
Fig. 5：For the straight line row pattern water flooding regime schematic diagram under existing mining type.
Fig. 6：For the schematic diagram that anti-9 flooding patterns of rhombus are adjusted to straight line row pattern water flooding regime in prior art.
Fig. 7：The cumulative oil production comparison diagram of combination and exploitation method of the present invention is adopted and is provided without for certain block.
Fig. 8：The yearly rate-oil production comparison diagram of combination and exploitation method of the present invention is adopted and is provided without for certain block.
Fig. 9：The recovery percent of reserves comparison diagram of combination and exploitation method of the present invention is adopted and is provided without for certain block.
Figure 10：The rate of oil production comparison diagram of combination and exploitation method of the present invention is adopted and is provided without for certain block.
Figure 11：It is the daily oil production comparison diagram of the oil well for adopting and being provided without combination and exploitation method of the present invention.
Reference in figure：1st, corner well (being located at the producing well on rhombus summit)；2nd, end hole (is located at the oil recovery on rhombus side
Well)；3rd, water injection well；4th, the line of the anti-9 flooding pattern construction units of rhombus；5th, the single crack that conventional pressure break is formed；6th, body
Overstock and split the slit band with certain crack bandwidth to be formed；7th, well row line；8th, the streamline of " spindle " radial flow；9th, metaideophone
Well (water injection well that producing well is transformed into)；10th, the line of rectangle "five-spot" flood system construction unit；11st, the stream of plane and straight line stream
Line；G, producing well row；W, row of water injector.
Wherein, the level direction of arrow to the right positioned at bottom in the accompanying drawing of part is orientation of principal stress.
Specific embodiment
In order to be more clearly understood to the technical characteristic of the present invention, purpose and effect, now control illustrates this
Bright specific embodiment.
For extra-low-permeability reservoir develop exist initial production it is low, development degree is low, energy supplement is difficult, economic benefit
Difference, the problem that rate of oil production is relatively low, recovery ratio is low, the invention provides a kind of straight well volume fracturing and wire water filling combination and exploitation
The method of extra-low-permeability reservoir, applicable extra-low-permeability reservoir type belongs to terrestrial facies multilayer sandstone non-saturated reservoir, without edge-bottom water
And pneumatic jack, sand thickness 2m-80m, oil reservoir average air permeability is less than 1.0mD-1.5mD, average pore 8.0%-
14.0%；The difference of minimum and maximum horizontal principal stress in the range of 5MPa-15MPa, with relatively more unified intrinsic fracture or
Person's man-made fracture direction.The method at least comprises the steps：
Step S1, forms rectangle "five-spot" flood system, producing well row is formed with the rectangle "five-spot" flood system and is noted
Well is arranged, and producing well is arranged and row of water injector is parallel to each other and is staggeredly disposed, and makes the producing well row and the row of water injector
Bearing of trend is parallel to orientation of principal stress (direction shown in horizontal arrow in figure).Rectangle is illustrate only in Fig. 1 and Fig. 2
One full unit of "five-spot" flood system, the full unit is by five mouthfuls of well constructions, wherein four mouthfuls of producing wells are located at respectively rectangle
Four corner locations, wherein a bite water injection well be located at rectangle center；Rectangle "five-spot" flood system is by multiple unit groups
Into shared corresponding producing well between two adjacent units.
Step S2, implements volume fracturing to producing well and water injection well successively, makes the producing well row and the row of water injector
Between streamline projection in the horizontal plane form straight line.Streamline refers to the water drive formed between row of water injector and producing well row
Streamline, namely water drive passage.
The technical advantage of combination and exploitation method of the present invention is water drive control, the water drive that oil reservoir well pattern is greatly improved
The swept volume of development degree and injection water；By the streamline form between producing well row and row of water injector by " spindle " radial flow
It is changed into linear circulation, reduces the filtrational resistance between oil-water well row and drive pressure reduction, sets up efficient row of water injector and oil recovery
Driving system between well row；Water injection capacity is enhanced, oil well well yield is increased substantially, is strengthened yield after oil well is imitated and is recovered
Degree, and then improve rate of oil production and final waterflood recovery efficiency factor.
In implementation steps S1, for new extra-low-permeability reservoir, rectangle "five-spot" flood system can be directly disposed, along
Orientation of principal stress disposes row of water injector and producing well row, forms producing well row parallel with row of water injector staggered
Well pattern structure (as shown in Figure 1).For the extra-low-permeability reservoir for adopting the anti-9 flooding patterns exploitation of rhombus, general producing well
Have been carried out conventional pressure break, and the non-pressure break of water injection well, square can be formed by well pattern infilling or flooding system adjustment
Shape "five-spot" flood system form (as shown in Figure 2).Well pattern infilling is referred in the position for needing arrangement producing well or water injection well
Newly establish corresponding producing well or water injection well.Flooding system adjustment is referred to and is changed into the corner well in anti-9 flooding patterns of rhombus
Water injection well.
The concrete steps of the method for straight well volume fracturing of the present invention and wire water filling combination and exploitation extra-low-permeability reservoir include：
The first step, forms rectangle "five-spot" flood system.
For the extra-low-permeability reservoir developed, if currently employed is anti-9 flooding patterns of rhombus, and well arranges (bag
Include producing well row and row of water injector) orientation of principal stress is oriented parallel to, corner well is changed into into water injection well, form rectangle
"five-spot" flood system.
For the extra-low-permeability reservoir developed, if currently employed is anti-9 flooding patterns of rhombus, but well row side
To being not parallel to orientation of principal stress, but define certain angle.So can by well pattern infilling or
Person's flooding system adjustment, forms rectangle "five-spot" flood system form.
For the extra-low-permeability reservoir developed, if currently employed is exactly rectangle "five-spot" flood system structure, then can
Directly to implement second step.
For new extra-low-permeability reservoir, rectangle "five-spot" flood system can be directly disposed, along maximum horizontal principal stress
Row of water injector and producing well row are disposed in direction.
Second step, to producing well volume fracturing is implemented.
The fractured interval of subdivision producing well, implements volume fracturing, it is ensured that the master connected with water injection well to each fractured interval
Power sand body interval single hop pressure break.For producing well of the well spacing between adjacent producing well less than 300m is arranged, a bite can adopted
Oil well is implemented to be spaced apart a bite producing well after volume fracturing, implements volume fracturing to the lower a bite producing well on well row, i.e., two
Cause for gossip is applied and be spaced between the producing well of volume fracturing the unreal producing well for applying volume fracturing of a bite.For adjacent oil recovery
Producing well of the well spacing between well more than 300m is arranged, and to every mouth producing well volume fracturing is all implemented.Well is guaranteed during volume fracturing
Man-made fracture end on row couples together, and the crack for extending and being sequentially connected along producing well row is formed in the horizontal plane
Band, the slit band has in the horizontal plane one fixed width.
3rd step, to water injection well volume fracturing is implemented.
After implementing volume fracturing 1 year to 2 years to producing well, the fractured interval of subdivision injection well, to each fractured interval reality
Apply volume fracturing, it is ensured that the main force's sand body interval single hop pressure break connected with producing well.It is little for the well spacing between adjacent water injection well
In the row of water injector of 300m, a bite water injection well can be spaced apart after volume fracturing is implemented to a bite water injection well, on well row
Lower a bite water injection well implements volume fracturing, i.e., apply in two causes for gossip and be spaced between the water injection well of volume fracturing the unreal donor of a bite
Overstock the water injection well for splitting.For row of water injector of the well spacing between adjacent water injection well more than 300m, to every mouth water injection well
All implement volume fracturing.Guarantee that the man-made fracture end on well row couples together during volume fracturing, formed in the horizontal plane along institute
The slit band that row of water injector extends and is sequentially connected is stated, the slit band has in the horizontal plane one fixed width.In the water filling
The streamline for being projected as straight line in the horizontal plane is formed between the slit band of well row and the slit band of producing well row, from
And form wire water flooding regime.
4th step, well is not exchanged, reversion displacement in flooding direction.
When the well head moisture content of the producing well reaches 80%, or the daily oil production of the producing well is less than 1t/d
When, the original water injection well is changed into into producing well, the original producing well is changed into into water injection well, invert displacement side
To realizing reverse wire water filling；This alternating mode is carried out at least one times, it is possible to use wheel conversion displacement more.
For above second step and the 3rd step, after numerical simulation of optimum, well spacing between the producing well and described
Well spacing between water injection well is chosen for 300m-500m, and the array pitch between the producing well row and the row of water injector is chosen for
80m-100m；The completion mode of producing well and water injection well adopts cased hole completion, is finely divided interval volume fracturing, volume fracturing
Operational discharge capacity is 6m3/ min～12m3/ min, single hop sand feeding amount 50m3More than, single hop pressure break liquid measure 1000m3More than, by down-hole
Micro-seismic monitoring, the width of the slit band that the slit band of the row of water injector of formation is arranged with the producing well is 50m-80m.
Straight well volume fracturing of the present invention and wire water filling combination and exploitation are illustrated below for the oil reservoir of a certain concrete block
The method of extra-low-permeability reservoir the block oil reservoir application, and using the inventive method with do not adopt opening for the inventive method
Send out Contrast on effect.
The block reservoir porosity 10.7%, permeability 0.4mD, original formation pressure 21.2MPa, maximum horizontal principal stress
The close east-west direction in direction, micro-seismic monitoring result show man-made fracture direction be close east-west direction, microcrack agensis.
Formation thickness 100m-120m, sand thickness 35m, effective thickness 8m-10m.Development Liang Ge main forces substratum, each substratum is effectively thick
Degree 2.4m-3m.Input exploitation in 2007, using anti-9 flooding patterns of rhombus, well row direction is east-west direction, parallel to maximum
Horizontal principal stress direction, well spacing 500m, array pitch 150m.
Step 1) form rectangle "five-spot" flood system.For the extra-low-permeability reservoir developed, currently employed is rhombus
Anti- 9 flooding patterns, and well row is oriented parallel to orientation of principal stress.First Year, by corner well water filling is changed into
Well, forms rectangle "five-spot" flood system.
Step 2) while, volume fracturing is implemented to producing well.The fractured interval of subdivision producing well, 1-3 layers are first paragraph,
5-6 layers are second segment, and 8-10 layers are the 3rd section.Operational discharge capacity is in 6m3/min-12m3/ min, single hop sand feeding amount 50m3With
On, single hop pressure break liquid measure 1000m3More than.Because producing well well spacing is 500m, every mouthful of well all implements volume fracturing, it is ensured that well is arranged
On man-made fracture end couple together, and in the horizontal plane formed one fixed width slit band.
Step 3) producing well implements volume fracturing after -2 years 1 year, and to water injection well volume fracturing is implemented.The pressure of subdivision injection well
Parting section, 1-3 layers are first paragraph, and 5-6 layers are second segment, and 8-10 layers are the 3rd section.Operational discharge capacity is in 6m3/min-
12m3/ min, single hop sand feeding amount 50m3More than, single hop pressure break liquid measure 1000m3More than.Due to injection well spacing be 500m, every mouthful of well
All implement volume fracturing, it is ensured that the man-made fracture end on well row couples together, and form one fixed width in the horizontal plane
Slit band, forms wire water flooding regime (referring to Fig. 2).
Step 4) when well head moisture content reaches 80%, or daily oil production be less than 1t/d when, by water injection well turn
For producing well, producing well switchs to water injection well, and reverse wire water filling is realized in reversion displacement direction.The other shift process of this kind of well
Can be using multiple.
Studied by reservoir numerical simulation, be compared for using combination and exploitation method of the present invention (the wire water injection technology of combination)
The development effectiveness of combination and exploitation method of the present invention (the wire water injection technology of combination) is not adopted (referring to Fig. 7, Fig. 8, Fig. 9 and Tu
10).After developing 15 years, cumulative oil production increases by 11.2 ten thousand tons, and annual oil production can improve 10,000 tons, and recovery percent of reserves is improved
4.4 percentage points, the first five years rate of oil production can improve 0.3-0.37 percentage point.Economic evaluation result shows, by the technology
Enforcement, the block internal rate of return (IRR) can be more than more than 30%.According to oil field production instance, 14-14 wells are to be provided without of the present invention group
The oil well of development technique is closed, 16-16 wells are using the oil well of combination and exploitation technology of the present invention.16-16 wells are formed after wire water filling,
The daily oil production ton day of 2 ton day -3 higher than 14-14 well, the cumulative oil production for producing 18 months has more 1446 tons (referring to Figure 11).
Schematically specific embodiment of the invention is the foregoing is only, the scope of the present invention is not limited to.It is any
Those skilled in the art, done equivalent variations and modification on the premise of the design without departing from the present invention and principle,
The scope of protection of the invention should be belonged to.
Claims (10)
1. a kind of method of straight well volume fracturing and wire water filling combination and exploitation extra-low-permeability reservoir, it is characterised in that the method
At least comprise the steps：
Step S1, forms rectangle "five-spot" flood system, and producing well row and water injection well are formed with the rectangle "five-spot" flood system
Row, and the bearing of trend of the producing well row and the row of water injector is made parallel to orientation of principal stress；
Step S2, implements volume fracturing to producing well and water injection well successively, the producing well is arranged and the row of water injector between
Streamline projection in the horizontal plane form straight line.
2. the method for straight well volume fracturing as claimed in claim 1 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, in step sl, on the basis of anti-9 flooding patterns of the rhombus developed the rectangle "five-spot" flood system is formed.
3. the method for straight well volume fracturing as claimed in claim 2 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, the producing well row of anti-9 flooding patterns of the rhombus and the bearing of trend of row of water injector should parallel to maximum horizontal master
Force direction, by the corner well in anti-9 flooding patterns of the rhombus water injection well is changed into, and forms the rectangle "five-spot" flood system.
4. the method for straight well volume fracturing as claimed in claim 2 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, the producing well row of anti-9 flooding patterns of the rhombus and bearing of trend and the maximum horizontal principal stress side of row of water injector
To forming an angle, corresponding producing well or water injection well are set up on the direction parallel with orientation of principal stress, and will
Corner well in anti-9 flooding patterns of the rhombus is changed into water injection well, forms the rectangle "five-spot" flood system.
5. the method for straight well volume fracturing as claimed in claim 1 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, in step s 2, first volume fracturing is implemented to the producing well, comprise the following steps that：
The fractured interval of the producing well is segmented, volume fracturing is implemented to each fractured interval, formed in the horizontal plane along described
The slit band that producing well row extends and is sequentially connected, the slit band has in the horizontal plane one fixed width.
6. the method for straight well volume fracturing as claimed in claim 5 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, the well spacing between the producing well be less than or equal to 300m when, two causes for gossip apply volume fracturing the producing well it
Between be spaced the unreal producing well for applying volume fracturing of a bite.
7. the method for straight well volume fracturing as claimed in claim 5 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, when the well spacing between the producing well is more than 300m, volume fracturing is implemented to producing well described in every mouth.
8. the method for straight well volume fracturing as claimed in claim 5 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, the producing well implements volume fracturing after -2 years 1 year, and to the water injection well volume fracturing is implemented, and comprises the following steps that：
The fractured interval of the water injection well is segmented, volume fracturing is implemented to each fractured interval, formed in the horizontal plane along described
The slit band that row of water injector extends and is sequentially connected, the slit band has in the horizontal plane one fixed width；In the water injection well
The streamline for being projected as straight line in the horizontal plane is formed between the slit band of the slit band of row and producing well row.
9. the method for straight well volume fracturing as claimed in claim 8 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, after having implemented step S2, when the well head moisture content of the producing well reaches 80%, or the day of the producing well
When oil production is less than 1t/d, the original water injection well is changed into into producing well, the original producing well is changed into into water filling
Well, reversion displacement direction, realizes reverse wire water filling；This alternating mode is carried out at least one times.
10. the method for straight well volume fracturing as claimed in claim 8 and wire water filling combination and exploitation extra-low-permeability reservoir, it is special
Levy and be, the well spacing between well spacing and the water injection well between the producing well is 300m-500m, the producing well row with
Array pitch between the row of water injector is 80m-100m；The slit band that the slit band of the row of water injector is arranged with the producing well
Width is 50m-80m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611046603.0A CN106639996B (en) | 2016-11-23 | 2016-11-23 | The method of straight well volume fracturing and linear water filling combination and exploitation extra-low-permeability reservoir |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611046603.0A CN106639996B (en) | 2016-11-23 | 2016-11-23 | The method of straight well volume fracturing and linear water filling combination and exploitation extra-low-permeability reservoir |
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| Publication Number | Publication Date |
|---|---|
| CN106639996A true CN106639996A (en) | 2017-05-10 |
| CN106639996B CN106639996B (en) | 2019-06-11 |
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| RU2785044C1 (en) * | 2022-03-15 | 2022-12-02 | Публичное акционерное общество "Нефтяная компания "Роснефть" (ПАО "НК "Роснефть") | Method for developing oil ultra-low-permeability deposits |
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| RU2785044C1 (en) * | 2022-03-15 | 2022-12-02 | Публичное акционерное общество "Нефтяная компания "Роснефть" (ПАО "НК "Роснефть") | Method for developing oil ultra-low-permeability deposits |
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