CN105822276B - Interval while water injection oil extraction method between multistage fracturing horizontal well seam - Google Patents
Interval while water injection oil extraction method between multistage fracturing horizontal well seam Download PDFInfo
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- CN105822276B CN105822276B CN201610253550.3A CN201610253550A CN105822276B CN 105822276 B CN105822276 B CN 105822276B CN 201610253550 A CN201610253550 A CN 201610253550A CN 105822276 B CN105822276 B CN 105822276B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 107
- 239000007924 injection Substances 0.000 title claims abstract description 82
- 238000002347 injection Methods 0.000 title claims abstract description 82
- 238000000605 extraction Methods 0.000 title claims abstract description 27
- 239000003921 oil Substances 0.000 claims abstract description 131
- 239000010779 crude oil Substances 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims description 19
- 230000002706 hydrostatic effect Effects 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000012163 sequencing technique Methods 0.000 claims description 5
- 239000008398 formation water Substances 0.000 claims 2
- 239000000446 fuel Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 17
- 238000006073 displacement reaction Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 description 9
- 238000011084 recovery Methods 0.000 description 7
- 238000002955 isolation Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001802 infusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/20—Displacing by water
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- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Interval while water injection oil extraction method between being stitched the present invention relates to a kind of multistage fracturing horizontal well, include the following steps：Staged fracturing horizontal well forms many cracks；Producing initial stage is exploited using natural energy, until bottom pressure drops to bubble point pressure；Oil pipe is taken out, note is installed respectively in the position in each odd level crack and adopts separating device, injection allocation valve is installed respectively in the position in each even level crack, the position corresponding to odd level crack on oil pipe opens up perforation, and oil pipe is put back to original position；Wellhead tree valve is closed, injection allocation valve, the water filling into oil sets annular space are opened, injection water flows through diversion pipe and enters even level crack；Wellhead tree valve is opened, crude oil is then produced by oil pipe out of odd level crack output enters that diversion pipe is formed with casing and oil pipe annular space, continues to keep to even level crack water injection at this time.It includes diversion pipe and packer that the note, which adopts separating device,.This method is simple for process, it can be achieved that uniform displacement, has higher actual application value.
Description
Technical field
The invention belongs to Reservoir Development technical fields, and in particular to be spaced while noting between a kind of multistage fracturing horizontal well seam
Water oil production method.
Background technology
Multistage fracturing horizontal well is to improve hypotonic, compact oil reservoir yield effective technology.Since hypotonic, ultralow permeable reservoir exists
Strata pressure is generally reduced comparatively fast after exploiting a period of time using natural energy, it is therefore desirable to energy is supplemented to it, to improve this
The development effectiveness of class oil reservoir.The well pattern form of conventional supplement energy is straight well water filling and multistage fracturing horizontal well production, this side
Formula needs arrange straight well around horizontal well, it is also necessary to consider horizontal section length, crack quantity, fracture interval and well pattern well type
Etc. factors.For this mode there are many defects, one side cost is higher；On the other hand injection water is easy to advance by leaps and bounds along crack, causes
Uneven displacement, yield declines rapidly if water enters crack.Currently, some scholars have developed multistage fracturing horizontal well seam
Between be spaced water flood recovery technology, i.e., in such a way that elder generation's water filling is recovered the oil again, but the technology process is more, efficiency is low, of high cost, produces
It still needs further improvement for amount.Therefore, it is badly in need of developing a kind of novel multistage fracturing horizontal well production technology, to solve existing skill
Defect existing for art.
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, it is spaced while notes between a kind of multistage fracturing horizontal well seam of present invention offer
Water 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：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure
Power；
Step 3：Oil pipe is taken out, note is then installed respectively in the position in each odd level crack and adopts separating device, every
The position in one even level crack is installed by injection allocation valve respectively；
Step 4：On the oil pipe of taking-up, perforation is opened up corresponding to the position in odd level crack, is then returned to oil pipe
Position before taking-up；
Step 5：Wellhead tree valve is closed, opens injection allocation valve, while in the oil sets annular space formed to oil pipe and casing
Water filling, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 6：Wellhead tree valve is opened, crude oil adopts the diversion pipe of separating device from odd level crack output and into note
In the annular space formed with casing and oil pipe, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep to even number at this time
Grade crack water injection.
Interval while water injection oil extraction method between the multistage fracturing horizontal well seam of the present invention, are in the same pressure break horizontal well
In, realize that note adopts isolation technique using oil pipe, casing and oil sets annular space, the water filling from oil sets annular space, injection water warp
When crossing odd level crack location, separating device is adopted using note, injection water is made to enter diversion pipe, then enters two via injection allocation valve
Grade, level Four, six grades, the even levels cracks such as eight grades, and inject water and cannot be introduced into level-one, three-level, Pyatyi, seven grades, the odd numbers such as nine grades
Grade crack.Crude oil is produced from odd level crack, is introduced into the annular space that diversion pipe is formed with casing and oil pipe, subsequently into oil pipe
Extraction, to realize water flood recovery technology simultaneously.Injection allocation valve is respectively set in each even level crack location, to control note
Water.This method can make odd level crack displacement of the water injected from even level crack simultaneously to both sides adjacent thereto,
The uniform displacement of reservoir oil is realized on vertical-horizontal pit shaft direction, and then improves sweep area, improves oil displacement efficiency.
Preferably, in step 1, fracturing fracture is at least three-level.More preferably nine grades of cracks.
In any of the above-described scheme preferably, in step 3, it is corresponding mounted on odd level crack that note adopts separating device
In the oil sets annular space that oil pipe is formed with casing, injection allocation valve is mounted on the water filling hole site in even level crack.
In any of the above-described scheme preferably, in step 5, when water filling, monitors strata pressure.
In any of the above-described scheme preferably, when reservoir pressure coefficient is equal to 1, according to balanced flood principle, water filling
Amount is equal to oil production, and strata pressure restores to original formation pressure.
In any of the above-described scheme preferably, when reservoir pressure coefficient is less than 1, stratum is low-pressure stratum, water injection rate
More than oil production, strata pressure restores to pressure and hydrostatic pressure, and water injection rate is calculated according to conservation of matter principle.
In any of the above-described scheme preferably, in step 6, to even level crack water injection until strata pressure restore to
After original formation pressure or pressure and hydrostatic pressure, wellhead tree valve is opened.
In any of the above-described scheme preferably, it includes diversion pipe and packer that the note, which adopts separating device,.
In any of the above-described scheme preferably, the diversion pipe is arranged between packer I and packer II.
Interval while water injection oil extraction method between being stitched the present invention also provides another multistage fracturing horizontal well, according to sequencing
Include the following steps：
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：Note is installed respectively in the position in each odd level crack and adopts separating device, is split in each even level
Injection allocation valve is installed in the position of seam respectively, and the position corresponding to odd level crack on oil pipe opens up perforation；
Step 3：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure
Power；
Step 4：Wellhead tree valve is closed, opens injection allocation valve, while in the oil sets annular space formed to oil pipe and casing
Water filling, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 5：Wellhead tree valve is opened, crude oil adopts the diversion pipe of separating device from odd level crack output and into note
In the annular space formed with casing and oil pipe, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep to even number at this time
Grade crack water injection.
Preferably, it includes diversion pipe and packer that the note, which adopts separating device,.
In any of the above-described scheme preferably, the diversion pipe is arranged between packer I and packer II.
Interval while water injection oil extraction method between the multistage fracturing horizontal well seam of the present invention, it is simple for process, it is easy to operate, it should
Method is applied on same water horizontal well, realizes that note adopts isolation technique using oil pipe, casing and oil sets annular space, injection water from
Even level crack enters stratum, recovers the oil from the odd level crack of water filling crack both sides, and this method can not only reduce cost, also
Uniform displacement may be implemented, improve yield, there is higher actual application value.
Description of the drawings
Fig. 1 is a preferred embodiment of interval while water injection oil extraction method between multistage fracturing horizontal well according to the invention seam
While water flood recovery process schematic；
Fig. 2 is that interval is implemented shown in Fig. 1 of water injection oil extraction method simultaneously between multistage fracturing horizontal well according to the invention stitches
The note of example adopts the structural schematic diagram of separating device；
Fig. 3 is that interval is implemented shown in Fig. 1 of water injection oil extraction method simultaneously between multistage fracturing horizontal well according to the invention stitches
The horizontal segment cross-sectional view of the multistage fracturing horizontal well odd level crack corresponding position of example.
Explanation is marked in figure：1- pressure break horizontal wells, 2- odd levels crack, 3- even levels crack, 4- oil pipes, 5- casings, 6-
Oil sets annular space, 7- notes adopt separating device, 8- injection allocation valves, 9- water injection holes, 71- diversion pipes, 72- packers, 721- packers
I, 722- packer II.
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.
Embodiment one：
An embodiment of interval while water injection oil extraction method between multistage fracturing horizontal well seam according to the invention, according to elder generation
Sequentially include the following steps afterwards：
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：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure
Power；
Step 3：Oil pipe is taken out, note is then installed respectively in the position in each odd level crack and adopts separating device, every
The position in one even level crack is installed by injection allocation valve respectively；
Step 4：On the oil pipe of taking-up, perforation is opened up corresponding to the position in odd level crack, is then returned to oil pipe
Position before taking-up；
Step 5：Wellhead tree valve is closed, opens injection allocation valve, while in the oil sets annular space formed to oil pipe and casing
Water filling, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 6：Wellhead tree valve is opened, crude oil adopts the diversion pipe of separating device from odd level crack output and into note
In the annular space formed with casing and oil pipe, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep to even number at this time
Grade crack water injection.
As shown in Figure 1, interval while water injection oil extraction method between the multistage fracturing horizontal well seam of the present embodiment, are same
In pressure break horizontal well 1, realize that note adopts isolation technique using oil pipe 4, casing 5 and oil sets annular space 6, from oil sets annular space 6
Middle water filling adopts separating device 7 using note, injection water is made to enter diversion pipe 71 when injection water passes through 2 position of odd level crack, after
And via injection allocation valve 8 enter two level, level Four, six grades, the even levels cracks 3 such as eight grades, and inject water cannot be introduced into level-one, three-level,
Pyatyi, seven grades, the odd levels cracks 2 such as nine grades.Crude oil is produced from odd level crack 2, is introduced into diversion pipe 71 and casing 5 and oil pipe
It in 4 annular spaces formed, is produced subsequently into oil pipe 4, to realize water flood recovery technology simultaneously.In each even level crack 3
Injection allocation valve 8 is respectively set in position, to control water injection rate.This method can make the water injected from even level crack 3 simultaneously to
2 displacement of odd level crack of both sides adjacent thereto realizes the uniform displacement of reservoir oil on vertical-horizontal pit shaft direction, and then improves and involve
Area improves oil displacement efficiency.
In step 1, fracturing fracture is nine grades.It is followed successively by level-one, two level, three-level, level Four, five from left to right in Fig. 1
Grade, six grades, seven grades, eight grades and nine grades.
In step 3, note adopts the oil jacket ring that separating device 7 is formed mounted on 2 corresponding oil pipe 4 of odd level crack with casing 5
In shape space 6, injection allocation valve 8 is mounted on 9 position of water injection hole in even level crack 3.
In step 5, when water filling, monitors strata pressure.When reservoir pressure coefficient is equal to 1, according to balanced flood principle, note
Water is equal to oil production, and strata pressure restores to original formation pressure；When reservoir pressure coefficient is less than 1, stratum is for low pressure
Layer, water injection rate are more than oil production, and strata pressure restores to pressure and hydrostatic pressure, and water injection rate is calculated according to conservation of matter principle.
In step 6, to even level crack water injection until strata pressure restores to original formation pressure or pressure and hydrostatic pressure
Afterwards, wellhead tree valve is opened.
As shown in Figures 2 and 3, it includes diversion pipe 71 and packer 72 that the note, which adopts separating device 7,.The diversion pipe 71 is set
It sets between packer I 721 and packer II 722.
Interval while water injection oil extraction method between the multistage fracturing horizontal well seam of the present embodiment, it is simple for process, it is easy to operate,
This method is applied on same water horizontal well, is realized that note adopts isolation technique using oil pipe, casing and oil sets annular space, is injected water
Entering stratum from even level crack, recovers the oil from the odd level crack of water filling crack both sides, this method can not only reduce cost,
It can also realize uniform displacement, improve yield, there is higher actual application value.
Embodiment two：
Another embodiment of interval while water injection oil extraction method between multistage fracturing horizontal well seam according to the invention, according to
Sequencing includes the following steps：
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：Note is installed respectively in the position in each odd level crack and adopts separating device, is split in each even level
Injection allocation valve is installed in the position of seam respectively, and the position corresponding to odd level crack on oil pipe opens up perforation；
Step 3：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure
Power；
Step 4：Wellhead tree valve is closed, opens injection allocation valve, while in the oil sets annular space formed to oil pipe and casing
Water filling, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 5：Wellhead tree valve is opened, crude oil adopts the diversion pipe of separating device from odd level crack output and into note
In the annular space formed with casing and oil pipe, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep to even number at this time
Grade crack water injection.
In step 1, fracturing fracture be nine grades, be followed successively by from left to right level-one, two level, three-level, level Four, Pyatyi, six grades,
Seven grades, eight grades and nine grades.
In step 2, it is empty that note adopts the oil jacket annular that separating device is formed mounted on the corresponding oil pipe in odd level crack with casing
In, injection allocation valve is mounted on the water filling hole site in even level crack.
In step 4, when water filling, monitors strata pressure.When reservoir pressure coefficient is equal to 1, according to balanced flood principle, note
Water is equal to oil production, and strata pressure restores to original formation pressure；When reservoir pressure coefficient is less than 1, stratum is for low pressure
Layer, water injection rate are more than oil production, and strata pressure restores to pressure and hydrostatic pressure, and water injection rate is calculated according to conservation of matter principle.
In step 5, to even level crack water injection until strata pressure restores to original formation pressure or pressure and hydrostatic pressure
Afterwards, wellhead tree valve is opened.
It includes diversion pipe and packer that the note, which adopts separating device,.The diversion pipe is arranged in packer I and packer II
Between.
The principle of water flood recovery technology, advantageous effect etc. are identical as embodiment one while the present embodiment.
It will be apparent to those skilled in the art that interval while water injection oil extraction method between the multistage fracturing horizontal well seam of the present invention
Each section shown by invention content and specific embodiment part and attached drawing including aforementioned present invention specification it is arbitrary
Combination describes one by one as space is limited and for each scheme for keeping specification concise without constituting these combinations.It is all in the present invention
Spirit and principle within, any modification, equivalent substitution, improvement and etc. done, should be included in protection scope of the present invention it
It is interior.
Claims (6)
1. interval while water injection oil extraction method between a kind of multistage fracturing horizontal well seam, include 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：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure；
Step 3：Oil pipe is taken out, note is then installed respectively in the position in each odd level crack and adopts separating device, in each
The position in even level crack is installed by injection allocation valve respectively；
Step 4：On the oil pipe of taking-up, perforation is opened up corresponding to the position in odd level crack, oil pipe is then returned to taking-up
Preceding position；
Step 5：Wellhead tree valve is closed, opens injection allocation valve, while being noted in the oil sets annular space formed to oil pipe with casing
Water, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 6：Wellhead tree valve is opened, crude oil adopts the diversion pipe and set of separating device from odd level crack output and into note
In the annular space that pipe and oil pipe are formed, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep splitting to even level at this time
Stitch water filling；
In step 1, fracturing fracture is at least three-level；
In step 3, note adopts the oil sets annular space that separating device is formed mounted on the corresponding oil pipe in odd level crack with casing
Interior, injection allocation valve is mounted on the water filling hole site in even level crack；It includes diversion pipe and packer that the note, which adopts separating device, described
Diversion pipe is arranged between packer I and packer II；
A piece oil pipe is installed in described sleeve pipe；On same water horizontal well, into oil pipe and the oil sets annular space of casing formation
Water filling, injection water enter stratum from even level crack, recover the oil from the odd level crack of water filling crack both sides, and crude oil is produced from oil pipe
Go out；Even level crack water injection and odd level crack, which are recovered the oil, to be carried out at the same time.
2. interval while water injection oil extraction method between multistage fracturing horizontal well seam as described in claim 1, it is characterised in that：Step
In five, when water filling, monitors strata pressure.
3. interval while water injection oil extraction method between multistage fracturing horizontal well seam as claimed in claim 2, it is characterised in that：It is local
When being laminated force coefficient and being equal to 1, according to balanced flood principle, water injection rate is equal to oil production, and strata pressure restores to being primitively laminated
Power.
4. interval while water injection oil extraction method between multistage fracturing horizontal well seam as claimed in claim 2, it is characterised in that：It is local
When being laminated force coefficient less than 1, stratum is low-pressure stratum, and water injection rate is more than oil production, and strata pressure restores to pressure and hydrostatic pressure, root
Water injection rate is calculated according to conservation of matter principle.
5. interval while water injection oil extraction method between multistage fracturing horizontal well seam as described in claim 1, it is characterised in that：Step
In six, to even level crack water injection until strata pressure restores to original formation pressure or pressure and hydrostatic pressure, opens well head and adopt
Fuel tap.
6. interval while water injection oil extraction method between a kind of multistage fracturing horizontal well seam, include 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：Note is installed respectively in the position in each odd level crack and adopts separating device, in each even level crack
Injection allocation valve is installed in position respectively, and the position corresponding to odd level crack on oil pipe opens up perforation；
Step 3：In producing initial stage, a period of time is exploited using natural energy, until bottom pressure drops to bubble point pressure；
Step 4：Wellhead tree valve is closed, opens injection allocation valve, while being noted in the oil sets annular space formed to oil pipe with casing
Water, injection water flow through note and adopt the diversion pipe of separating device and enter even level crack；
Step 5：Wellhead tree valve is opened, crude oil adopts the diversion pipe and set of separating device from odd level crack output and into note
In the annular space that pipe and oil pipe are formed, oil pipe extraction is then entered by the perforation on oil pipe, continues to keep splitting to even level at this time
Stitch water filling；
In step 1, fracturing fracture is at least three-level；
In step 2, note adopts the oil sets annular space that separating device is formed mounted on the corresponding oil pipe in odd level crack with casing
Interior, injection allocation valve is mounted on the water filling hole site in even level crack；It includes diversion pipe and packer that the note, which adopts separating device, described
Diversion pipe is arranged between packer I and packer II；
A piece oil pipe is installed in described sleeve pipe；On same water horizontal well, into oil pipe and the oil sets annular space of casing formation
Water filling, injection water enter stratum from even level crack, recover the oil from the odd level crack of water filling crack both sides, and crude oil is produced from oil pipe
Go out；Even level crack water injection and odd level crack, which are recovered the oil, to be carried out at the same time.
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