CN106194131B - It is spaced CO between multistage fracturing horizontal well seam2Oil flooding method - Google Patents
It is spaced CO between multistage fracturing horizontal well seam2Oil flooding method Download PDFInfo
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- CN106194131B CN106194131B CN201610564574.0A CN201610564574A CN106194131B CN 106194131 B CN106194131 B CN 106194131B CN 201610564574 A CN201610564574 A CN 201610564574A CN 106194131 B CN106194131 B CN 106194131B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000003921 oil Substances 0.000 claims abstract description 154
- 238000002347 injection Methods 0.000 claims abstract description 52
- 239000007924 injection Substances 0.000 claims abstract description 52
- 239000010779 crude oil Substances 0.000 claims abstract description 24
- 238000011084 recovery Methods 0.000 claims abstract description 20
- 230000005465 channeling Effects 0.000 claims abstract description 6
- 238000004519 manufacturing process Methods 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 description 11
- 239000003129 oil well Substances 0.000 description 10
- 238000011161 development Methods 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 239000012530 fluid Substances 0.000 description 6
- 230000000704 physical effect Effects 0.000 description 6
- 230000011218 segmentation Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000013589 supplement Substances 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 230000006837 decompression Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003111 delayed effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000000638 stimulation Effects 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- E21B43/164—Injecting CO2 or carbonated water
-
- 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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Earth Drilling (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
It is spaced CO between being stitched the present invention relates to a kind of multistage fracturing horizontal well2Oil flooding method includes the following steps：Staged fracturing is carried out to horizontal well pit shaft, forms a plurality of fracturing fracture perpendicular to horizontal well pit shaft；Oil pipe I and oil pipe II are installed in the casing in horizontal well pit shaft, flow controller I is installed corresponding to the position in even level crack on oil pipe I, flow controller II is installed corresponding to the position in odd level crack on oil pipe II, the position between odd level crack and even level crack is corresponded in oil sets annular space, packer is set；Producing initial stage is exploited using natural energy, until bottom pressure drops to bubble point pressure, then crack interval is utilized to exploit, is injected CO into oil pipe I2, CO2Into even level crack, while crude oil from odd level crack output and enters in oil pipe II；When oil recovery amount is less than limiting economic rate, stop injection CO2.This method can increase substantially oil recovery factor, also can effectively inhibit has channeling problem.
Description
Technical field
The invention belongs to Reservoir Development technical fields, and in particular to be spaced CO between a kind of multistage fracturing horizontal well seam2It drives
Oil production method.
Background technology
With the rapid growth of global demand of petroleum, oil-gas exploration and development object is increasingly sophisticated, reserves grade worse and worse,
Hypotonic, ultralow permeable reservoir will be as the main object of oil field development from now on.The newly-increased crude oil proved reserves of onshore oil field in China
In, low-permeability oil deposit proportion increased dramatically, therefore hyposmosis and compact oil reservoir just gradually become China's future oil and gas development
Emphasis.
Multistage fracturing horizontal well is commonly used in exploitation low permeability oil field, it is capable of providing the channel of oil and gas flow, to carry
High production capacity.But on the one hand since reservoir matrix is dense, fluid is difficult to flow, and the initial stage of multistage fracturing horizontal well is caused to be produced
Amount drastically declines, so being badly in need of carrying out energy supplement；On the other hand due to large-scale artificial fracturing, underground percolation field is made to occur
Large change, if carrying out water flooding recovery, injection water is easy to advance by leaps and bounds along crack, to influence exploitation effect.In oil
It is different so as to cause interstitial production capacities at different levels due to the pressure and permeability difference between each crack in underground in well production, such as
Fruit takes no action to make each oil reservoir collaboration exploitation, and the coefficient of mining for leading to oil well is drastically declined.Therefore, it is badly in need of developing a kind of multistage
Oil production method is spaced between pressure break horizontal well seam, this method is using injection CO2The mode of gas is exploited, while introducing note in real time
It adopts way to manage and carries out coordination control.
The patent of invention that application publication number is CN105114048A discloses a kind of horizontal well fracturing single-well injection-production and adopts
Oily method, this method generate a plurality of pressure break perpendicular to horizontal wellbore by horizontal well fracturing, in oil reservoir different parts and split
Seam chooses a wherein crack as fluid infusion channel, and the crack of both sides adjacent thereto produces channel, displacement as crude oil
Crude oil along positioned at intermediate crack to both sides flow in fracture；It is segmented packing technology in conjunction with double tube, splits this in horizontal well
Seam is insulated with two adjacent cracks, and fluid is injected from intermediate cracking, and the displacement crude oil crack adjacent from both sides flow to water
Horizontal well cylinder, production fluid is along another oil pipe channel output pit shaft, to form segmentation single-well injection-production system in same level well
System.The technical solution is more complicated, in horizontal well, can only carry out water filling and oil recovery, this three crack to three cracks every time
After completing water filling and recovering the oil, water filling and oil recovery could be carried out to other three crack adjacent thereto, it is seen that production process is more, raw
Production efficiency is low, and the technical solution is unable to the total oil production of quantitative assessment and the oil production per crack in addition.
Invention content
To solve problems of the prior art, CO is spaced between a kind of multistage fracturing horizontal well seam of present invention offer2It drives
Oil production method includes the following steps according to sequencing：
Step 1：Staged fracturing is carried out to horizontal well pit shaft, forms a plurality of fracturing fracture perpendicular to horizontal well pit shaft；
Step 2：Oil pipe I and oil pipe II are installed in the casing in horizontal well pit shaft, even level is corresponded on oil pipe I
Flow controller I is installed in the position in crack, and flow controller II is installed corresponding to the position in odd level crack on oil pipe II,
Correspond to the position between odd level crack and even level crack in oil sets annular space and packer is set；
Step 3：It in producing initial stage, is exploited using natural energy, automatically turns on flow controller I and flow controller II,
Crude oil is respectively enterd from odd level crack and even level crack while output in oil pipe II and oil pipe I；
Step 4：When bottom pressure drops to bubble point pressure, CO is injected using crack interval2Exploitation, is noted into oil pipe I
Enter CO2, CO2Into even level crack, while crude oil from odd level crack output and enters in oil pipe II；
Step 5：When oil recovery amount is less than limiting economic rate, stop injection CO2, while flow control is automatically closed
Device I and flow controller II.
The oil production method of the present invention is the new energy supplement mode proposed for multistage fracturing horizontal well, and which uses
CO2Displacement is recovered the oil.For low permeability oil field, injection gas pressure is lower than water injection pressure, it is easy to accomplish balanced flood, and
And use CO2Reservoir damage will not be caused, is not reacted with water flooding, rock and clay mineral, while recovery ratio can be improved.
CO2Effect for improving recovery ratio is mainly manifested in the following aspects：Reduce viscosity of crude；Make crude oil volume expansion；It steams
Hair extraction crude oil intermediate hydrocarbon component；Reduce interfacial tension；Change oil density；Decompression forms dissolved gas drive.
The oil production method of the present invention in oil reservoir different parts by horizontal well fracturing, generating a plurality of perpendicular to level
The fracturing fracture of well chooses wherein even level crack as CO2Injection channel, odd level crack adjacent thereto are adopted as crude oil
Go out channel, displacement crude oil is along gas injection crack to both sides flow in fracture adjacent thereto；In combination with double tube segmentation packing and
Intelligent control technology is insulated between horizontal well multistage fracturing crack, and the unlatching of flow controller is controlled by ground electric
And closure, and then control underground CO2Segmentation injection, to realize the interstitial single-well injection-production of segmentation.
Preferably, in step 1, the fracturing fracture is at least three-level.More preferably Pyatyi crack.
In any of the above-described scheme preferably, in step 2, the oil pipe I and the oil pipe II are flat with described sleeve pipe
Row.
In any of the above-described scheme preferably, the oil pipe I and the oil pipe II form oil jacket ring with described sleeve pipe
Shape space.Packer is set in oil sets annular space, and the space in casing is divided into gas injection channel and recovered the oil logical by packer
Road.The different location in crack is adopted according to note, gas injection channel and oil channel alternately exist in oil sets annular space.
In any of the above-described scheme preferably, packaged unit is installed in the end of the oil pipe I.
In any of the above-described scheme preferably, the flow controller I on the oil pipe I passes through the reality on cable and ground
When management of injection and production system connect.
In any of the above-described scheme preferably, the flow controller II on the oil pipe II passes through on cable and ground
Real-time management of injection and production system connection.
Intelligent control technology is combined in the oil production method of the present invention, real-time management of injection and production system is set on the ground, profit
The information such as down-hole pressure, temperature, gas flow, oil recovery flow are acquired in real time with the permanent sensor being arranged in underground, and are led to
Cable is crossed by the signal transmission to ground of acquisition, then the data of acquisition are analyzed and excavated using software platform, together
When combine reservoir numerical simulation to analyze and optimize, form reservoir management decision information, and pass through control system Real-time Feedback to well
Under, production remote control is carried out to oil reservoir, and then improve oil well occurrence.
The oil production method of the present invention controls all I Hes of flow controller in underground by the real-time management of injection and production system on ground
The open and close of flow controller II, and then realize the oil recovery of the gas injection and odd level crack in even level crack.When in production
When there is gas coning, gas coning can be delayed by adjusting interval flow.
In any of the above-described scheme preferably, in step 3, after turn-on flow rate controller I, oil pipe I and even level crack
Between form gas injection channel.
In any of the above-described scheme preferably, in step 3, after turn-on flow rate controller II, oil pipe II is split with odd level
Oil channel is formed between seam.
In step 3, when stratum energy decline is very fast, production decline is very fast or recovery ratio reduces, between recycling crack
Every injection CO2The method of exploitation.
In any of the above-described scheme preferably, in step 4, pass through the well of real-time management of injection and production system monitoring horizontal well
Lower information is directly controlled corresponding with the well section when has channeling occurs in a certain well section by the real-time management of injection and production system of control
The closing and unlatching of flow controller I and/or flow controller II.
The oil production method of the present invention needs to select suitable tubing size, to ensure that oil pipe can be smoothly in lower going-into-well, together
When the note amount of adopting that meets the requirements.When casing diameter is 18-20cm, the diameter of two oil pipes is preferably 5cm；It is suitable to also need to selection
Suitable hyposmosis or compact oil reservoir, core intersection is not less than 10m, for carrying out horizontal well pit shaft staged fracturing.Horizontal well pit shaft
It is drilled to along bottom minimum horizontal principal stress direction, in order to be formed perpendicular to horizontal well pit shaft when subsequent implementation staged fracturing
Radial fissure, horizontal well pit shaft is located in the middle part of oil reservoir, and length is not less than 100m.Exploitation oil reservoir position is also required not contain side
Bottom water leads to quick water logging because the presence of edge-bottom water can be partially formed water cone in horizontal well pit shaft, causes the big volume production of oil well
Water.According to reservoir physical property, horizontal well pit shaft is divided into several sections, segmentation carries out pressure break, is 80-150m per segment length.
It is spaced CO between the multistage fracturing horizontal well seam of the present invention2Oil flooding method has following remarkable result：(1) it utilizes
CO2Interstitial residual crude oil is exploited in displacement, can increase substantially oil recovery factor；(2) joint set exploitation is adopted by note,
The crude oil in oil well is produced to the maximum extent, there is good development effectiveness；(3)CO2Injection pressure is not influenced by well spacing, can
Crack interval is determined according to reservoir physical property, convenient for control injection production pressure difference and displacement intensity；(4) intelligent control technology is combined, in well
Lower installation flow controller is selectively opened and is closed to different layers position by the real-time management of injection and production system on ground
It closes, to realize the purpose produced from specific interval, also can effectively inhibit has channeling problem；(5) production process embodies intelligent behaviour
Make, the yield or injection rate in different cracks can be controlled or adjusted according to different reservoir physical properties, reach rational proration
Injection allocation improves fluid distrbution difference between seam；(6) it considers that the smaller reality of domestic oil well borehole size needs, uses electronic
The hydraulic driving mode of control mode, generic flow control valve needs mating hydraulic control lines, when underground valve is more
The installation connection of hydraulic control lines is relatively difficult, and when borehole size is smaller, the difficulty is especially prominent, and Electronic control mode
It is compact-sized, particularly suitable for slim-hole occasion；(7) it can be reached by single port horizontal well pit shaft while inject CO2With adopt
The dual function of oil, slows down restriction of the oil well quantity for oilfield stimulation, to substantially reduce oil field development cost.
Description of the drawings
Fig. 1 is to be spaced CO between multistage fracturing horizontal well according to the invention stitches2One preferred embodiment of oil flooding method exists
The principle schematic of natural depletion phase；
Fig. 2 is to be spaced CO between multistage fracturing horizontal well according to the invention stitches2The embodiment illustrated in fig. 1 of oil flooding method exists
CO is injected in crack interval2Displacement oil recovery process schematic diagram.
Explanation is marked in figure：1- casings, 2- oil pipes I, 3- oil pipes II, 4- even levels crack, 5- odd levels crack, 6- streams
Amount controller I, 7- flow controllers II, 8- oil sets annular spaces, 9- packers, 10- packaged units, 11- cables.
Specific implementation mode
In order to be further understood that the invention content of the present invention, the present invention is elaborated below in conjunction with specific embodiment.
As depicted in figs. 1 and 2, it is spaced CO between multistage fracturing horizontal well seam according to the invention2The one of oil flooding method is real
Example is applied, is included the following steps according to sequencing：
Step 1：Staged fracturing is carried out to horizontal well pit shaft, forms a plurality of fracturing fracture perpendicular to horizontal well pit shaft；
Step 2：Installation oil pipe I 2 and oil pipe II 3 in casing 1 in horizontal well pit shaft correspond to even on oil pipe I 2
Flow controller I 6 is installed in the position in several levels crack 4, and flow control is installed corresponding to the position in odd level crack 5 on oil pipe II 3
Device II 7 processed corresponds to the setting of the position between odd level crack 5 and even level crack 4 packer in oil sets annular space 8
9；
Step 3：It in producing initial stage, is exploited using natural energy, automatically turns on flow controller I 6 and flow controller
II 7, crude oil is respectively enterd from odd level crack 5 and even level crack 4 while output in oil pipe II 3 and oil pipe I 2；
Step 4：When bottom pressure drops to bubble point pressure, CO is injected using crack interval2Exploitation, into oil pipe I 2
Inject CO2, CO2Into even level crack 4, while crude oil from 5 output of odd level crack and enters in oil pipe II 3；
Step 5：When oil recovery amount is less than limiting economic rate, stop injection CO2, while flow control is automatically closed
Device I 6 and flow controller II 7.
The oil production method of the present embodiment is the new energy supplement mode proposed for multistage fracturing horizontal well, and which is adopted
Use CO2Displacement is recovered the oil.For low permeability oil field, injection gas pressure is lower than water injection pressure, it is easy to accomplish balanced flood,
And use CO2Reservoir damage will not be caused, is not reacted with water flooding, rock and clay mineral, while recovery ratio can be improved.
CO2Effect for improving recovery ratio is mainly manifested in the following aspects：Reduce viscosity of crude；Make crude oil volume expansion；It steams
Hair extraction crude oil intermediate hydrocarbon component；Reduce interfacial tension；Change oil density；Decompression forms dissolved gas drive.
The oil production method of the present embodiment in oil reservoir different parts by horizontal well fracturing, generating a plurality of perpendicular to water
The fracturing fracture of horizontal well chooses wherein even level crack as CO2Injection channel, odd level crack adjacent thereto is as crude oil
Channel is produced, displacement crude oil is along gas injection crack to both sides flow in fracture adjacent thereto；It is segmented and insulates in combination with double tube
And intelligent control technology, it is insulated between horizontal well multistage fracturing crack, opening for flow controller is controlled by ground electric
It opens and is closed, and then control underground CO2Segmentation injection, to realize the interstitial single-well injection-production of segmentation.
In step 1, the fracturing fracture is Pyatyi.
In step 2, the oil pipe I 2 and the oil pipe II 3 are parallel with described sleeve pipe 1, and are formed with described sleeve pipe 1
Oil sets annular space 8.Packer 9 is set in oil sets annular space 8, and the space 8 in casing is divided into gas injection and led to by packer 9
Road and oil channel.The different location in crack is adopted according to note, gas injection channel and oil channel are alternately deposited in oil sets annular space
.The end of the oil pipe I 2 is installed by packaged unit 10.Flow controller I 6 on the oil pipe I 2 passes through cable 11 and ground
On real-time management of injection and production system connection；Flow controller II 7 on the oil pipe II 3 by cable 11 with it is real-time on ground
Management of injection and production system connects.
The oil production method of the present embodiment controls all flow controllers in underground I by real-time management of injection and production system on ground
With the open and close of flow controller II, and then the oil recovery of the gas injection and odd level crack in even level crack is realized.Work as production
In when there is gas coning, gas coning can be delayed by adjusting interval flow.
In step 3, after turn-on flow rate controller I 6, gas injection channel is formed between oil pipe I 2 and even level crack 4；It opens
After flow controller II 7, oil channel is formed between oil pipe II 3 and odd level crack 5.When stratum energy declines very fast, yield
When very fast or recovery ratio of successively decreasing reduces, crack interval is recycled to inject CO2The method of exploitation.
In step 4, by the down-hole information of real-time management of injection and production system monitoring horizontal well, when has channeling occurs in a certain well section
When, directly control flow controller I corresponding with the well section and/or flow controller by controlling real-time management of injection and production system
II closing and unlatching.
The oil production method of the present embodiment needs to select suitable tubing size, with ensure oil pipe can smoothly in lower going-into-well,
The note amount of adopting met the requirements simultaneously.When casing diameter is 18-20cm, the diameter of two oil pipes is preferably 5cm；It also needs to select
Suitable hyposmosis or compact oil reservoir, core intersection is not less than 10m, for carrying out horizontal well pit shaft staged fracturing.Horizontal Well
Cylinder is drilled to along bottom minimum horizontal principal stress direction, in order to be formed perpendicular to Horizontal Well when subsequent implementation staged fracturing
The radial fissure of cylinder, horizontal well pit shaft are located in the middle part of oil reservoir, and length is not less than 100m.Exploitation oil reservoir position is also required not contain
Edge-bottom water leads to quick water logging because the presence of edge-bottom water can be partially formed water cone in horizontal well pit shaft, causes the big volume production of oil well
Water.According to reservoir physical property, horizontal well pit shaft is divided into several sections, segmentation carries out pressure break, is 80-150m per segment length.
It is spaced CO between the multistage fracturing horizontal well seam of the present embodiment2Oil flooding method has following remarkable result：(1) it utilizes
CO2Interstitial residual crude oil is exploited in displacement, can increase substantially oil recovery factor；(2) joint set exploitation is adopted by note, most
Limits the crude oil in oil well is produced, there is good development effectiveness；(3)CO2Injection pressure is not influenced by well spacing, can root
Crack interval is determined according to reservoir physical property, convenient for control injection production pressure difference and displacement intensity；(4) intelligent control technology is combined, in underground
Flow controller is installed, different layers position is selectively opened and closed by the real-time management of injection and production system on ground
It closes, to realize the purpose produced from specific interval, also can effectively inhibit has channeling problem；(5) production process embodies intelligent behaviour
Make, the yield or injection rate in different cracks can be controlled or adjusted according to different reservoir physical properties, reach rational proration
Injection allocation improves fluid distrbution difference between seam；(6) it considers that the smaller reality of domestic oil well borehole size needs, uses electronic
The hydraulic driving mode of control mode, generic flow control valve needs mating hydraulic control lines, when underground valve is more
The installation connection of hydraulic control lines is relatively difficult, and when borehole size is smaller, the difficulty is especially prominent, and Electronic control mode
It is compact-sized, particularly suitable for slim-hole occasion；(7) it can be reached by single port horizontal well pit shaft while inject CO2With adopt
The dual function of oil, slows down restriction of the oil well quantity for oilfield stimulation, to substantially reduce oil field development cost.
It will be apparent to those skilled in the art that being spaced CO between the multistage fracturing horizontal well seam of the present invention2Oil flooding method packet
Include aforementioned present invention specification invention content and arbitrary group of each section shown by specific embodiment part and attached drawing
It closes, describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all the present invention
Within spirit and principle, any modification, equivalent substitution, improvement and etc. done should all be included in the protection scope of the present invention.
Claims (6)
1. being spaced CO between a kind of multistage fracturing horizontal well seam2Oil flooding method includes the following steps according to sequencing：Step 1：
Staged fracturing is carried out to horizontal well pit shaft, forms a plurality of fracturing fracture perpendicular to horizontal well pit shaft；
Step 2：Oil pipe I and oil pipe II are installed in the casing in horizontal well pit shaft, even level crack is corresponded on oil pipe I
Position install flow controller I, on oil pipe II corresponding to odd level crack position install flow controller II, in oil jacket
Correspond to the position between odd level crack and even level crack in annular space and packer is set；
Step 3：It in producing initial stage, is exploited using natural energy, automatically turns on flow controller I and flow controller II, crude oil
From odd level crack and even level crack while output, and respectively enter in oil pipe II and oil pipe I；
Step 4：When bottom pressure drops to bubble point pressure, CO is injected using crack interval2Exploitation, injects into oil pipe I
CO2, CO2Into even level crack, while crude oil from odd level crack output and enters in oil pipe II；
Step 5：When oil recovery amount is less than limiting economic rate, stop injection CO2, while I He of flow controller is automatically closed
Flow controller II；
The fracturing fracture is at least three-level；The oil pipe I and the oil pipe II are parallel with described sleeve pipe, on the oil pipe I
Flow controller I connect with the real-time management of injection and production system on ground by cable, the flow controller on the oil pipe II
II is connect by cable with the real-time management of injection and production system on ground；On same water horizontal well, CO is injected into oil pipe I2, CO2
Enter stratum from even level crack, recovers the oil from the odd level crack of gas injection crack both sides, crude oil output from oil pipe II.
2. being spaced CO between multistage fracturing horizontal well seam as described in claim 12Oil flooding method, it is characterised in that：The oil pipe
I and the oil pipe II with described sleeve pipe formed oil sets annular space.
3. being spaced CO between multistage fracturing horizontal well seam as described in claim 12Oil flooding method, it is characterised in that：The oil pipe
I end is installed by packaged unit.
4. being spaced CO between multistage fracturing horizontal well seam as described in claim 12Oil flooding method, it is characterised in that：Step 3
In, after turn-on flow rate controller I, gas injection channel is formed between oil pipe I and even level crack.
5. being spaced CO between multistage fracturing horizontal well seam as described in claim 12Oil flooding method, it is characterised in that：Step 3
In, after turn-on flow rate controller II, oil channel is formed between oil pipe II and odd level crack.
6. being spaced CO between multistage fracturing horizontal well seam as described in claim 12Oil flooding method, it is characterised in that：Step 4
In, it is real-time by controlling when has channeling occurs in a certain well section by the down-hole information of real-time management of injection and production system monitoring horizontal well
Management of injection and production system directly controls the closing and unlatching of flow controller I corresponding with the well section and/or flow controller II.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564574.0A CN106194131B (en) | 2016-07-18 | 2016-07-18 | It is spaced CO between multistage fracturing horizontal well seam2Oil flooding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610564574.0A CN106194131B (en) | 2016-07-18 | 2016-07-18 | It is spaced CO between multistage fracturing horizontal well seam2Oil flooding method |
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| CN106194131B true CN106194131B (en) | 2018-08-21 |
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| CN106837290B (en) * | 2017-02-14 | 2019-03-15 | 中国石油大学(北京) | The asynchronous note CO of the different well of grouping of symmetrical cloth seam2Oil production method |
| CN106761611A (en) * | 2017-02-14 | 2017-05-31 | 中国石油大学(北京) | Double pressure break horizontal well cyclic water stimulation oil production methods of zip mode cloth seam |
| CN106761606B (en) * | 2017-02-14 | 2019-03-15 | 中国石油大学(北京) | The asynchronous note CO of different well of symmetrical cloth seam2Oil production method |
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