CN106837290B - The asynchronous note CO of the different well of grouping of symmetrical cloth seam2Oil production method - Google Patents
The asynchronous note CO of the different well of grouping of symmetrical cloth seam2Oil production method Download PDFInfo
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 75
- 239000004744 fabric Substances 0.000 title claims abstract description 38
- 239000003921 oil Substances 0.000 claims abstract description 344
- 238000002347 injection Methods 0.000 claims abstract description 152
- 239000007924 injection Substances 0.000 claims abstract description 152
- 238000011084 recovery Methods 0.000 claims abstract description 107
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 83
- 239000010779 crude oil Substances 0.000 claims abstract description 23
- 238000000605 extraction Methods 0.000 claims abstract description 8
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 12
- 238000009826 distribution Methods 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 7
- 210000003296 saliva Anatomy 0.000 claims description 4
- 238000012163 sequencing technique Methods 0.000 claims description 3
- 241000169624 Casearia sylvestris Species 0.000 claims description 2
- 238000012856 packing Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 238000005325 percolation Methods 0.000 abstract description 3
- 238000005065 mining Methods 0.000 abstract description 2
- 230000000875 corresponding effect Effects 0.000 description 32
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- 230000009286 beneficial effect Effects 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000003138 coordinated effect Effects 0.000 description 4
- 239000003129 oil well Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 235000020681 well water Nutrition 0.000 description 4
- 239000002349 well water Substances 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 238000009835 boiling Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement 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
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/164—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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- 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
- E21B47/00—Survey of boreholes or wells
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
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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
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
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Abstract
The present invention relates to a kind of asynchronous note CO of the different well of grouping of symmetrical cloth seam2Oil production method, comprising the following steps: in horizontal well I, open the corresponding injection control device I in even level crack, inject CO into injection oil pipe I2, CO2Into even level crack, in horizontal well II, the corresponding injection control device II in odd level crack is opened, injects CO into injection oil pipe II2, CO2Into odd level crack；In horizontal well I, the corresponding oil recovery control device I in odd level crack is opened, crude oil is produced from odd level crack, and enter in oil recovery oil pipe I, in horizontal well II, open the corresponding oil recovery control device II in even level crack, crude oil is produced from even level crack, and is entered in oil recovery oil pipe II；Region between Liang Koushui horizontal well, part crude oil enters intrinsic fracture, and passes through the odd level crack of horizontal well I and the extraction of the even level crack of horizontal well II.The problems such as high percolation ability of intrinsic fracture is utilized in the note mining method, prevents water breakthrough and water logging.
Description
Technical field
The invention belongs to Reservoir Development technical fields, and in particular to a kind of asynchronous note of the different well of grouping of symmetrical expression cloth seam
CO2Oil production method.
Background technique
In recent years, since the Allowable exploitation quantity of conventional gas and oil is sharply reduced, the exploration and development of unconventional oil and gas is just
As new hot spot, fine and close oil is just among them.Compact oil reservoir generallys use the exploitation of failure formula in initial stage of development, but China is fine and close
The natural energy of oil reservoir is generally insufficient, and being applied alone failure mining method that can make, reservoir pressure decline is fast, production decline rate is fast, therefore
Need to carry out energy supplement, such as waterflooding extraction, note CO after exploitation a period of time2Exploitation etc..
Since compact reservoir hole is seeped, low, combination of zones is poor, and filtrational resistance is larger, and heterogeneity is higher, therefore using normal
The water flooding regime and flooding pattern of rule are developed, it is possible that a series of problem: the injection pressure of water injection well is usually larger, note
Enter difficulty；Easily form water breakthrough；Again because stratum filtration resistance is larger, and the fluid ability of injection water in the earth formation is poor, to lead
Cause swept volume relatively small, individual well amount of increase in production is relatively limited etc..Therefore, it is badly in need of developing a kind of asynchronous water filling of different well or note
CO2Oil production method between same well stitches on the basis of injection-production technology, further improves the swept volume of injection water, improves extraction
Degree.
The patent of invention that application publication number is CN106194131A is spaced CO between disclosing a kind of multistage fracturing horizontal well seam2
Oil flooding method, comprising the following steps: staged fracturing is carried out to horizontal well pit shaft, forms a plurality of pressure perpendicular to horizontal well pit shaft
Crack；Oil pipe I and oil pipe II are installed in the casing in horizontal well pit shaft, the position in even level crack is corresponded on oil pipe I
Installation flow controller I is set, flow controller II is installed in the position on oil pipe II corresponding to odd level crack, in oil jacket annular
Correspond to the position between odd level crack and even level crack in space and packer is set；Producing initial stage is opened using natural energy
It adopts, until bottom pressure drops to bubble point pressure, is then exploited using crack interval, inject CO into oil pipe I2, CO2Into idol
Several levels crack, while crude oil from odd level crack output and enters in oil pipe II.Although the patent of invention can be improved tar productivity,
But due to being adopted using individual well note, for oil-gas reservoir biggish for oil reservoir area, swept volume, sweep efficiency and recovery percent of reserves
Deng can all be restricted, to reduce oil production, the displacement to region of bypassed oil in stratum even more cannot achieve.
Summary of the invention
To solve problems of the prior art, the present invention provides a kind of asynchronous note of the different well of grouping of symmetrical cloth seam
CO2Oil production method, according to sequencing the following steps are included:
Step 1: in the earth formation by horizontal well I and the parallel arrangement of horizontal well II, and symmetrical pressure is carried out to two mouthfuls of water horizontal wells
It splits, is formed a plurality of perpendicular to horizontal well pit shaft and in the fracturing fracture of symmetrical distribution；Region between Liang Koushui horizontal well, water
The odd level crack of horizontal well I is connected to the even level crack of horizontal well II by intrinsic fracture；
Step 2: installation injection oil pipe I and oil recovery oil pipe I in the casing of horizontal well I correspond on injection oil pipe I
The position of fracturing fracture opens up perforation I, and injection control device I is arranged in I position of perforation, pressure break is corresponded on oil recovery oil pipe I
The position in crack opens up perforation I, and oil recovery control device I is arranged in I position of perforation；Packer I is installed in the two sides of fracturing fracture,
Packer I is arranged in the oil sets annular space of horizontal well I；
Step 3: installation injection oil pipe II and oil recovery oil pipe II in the casing of horizontal well II, it is right on injection oil pipe II
Perforation II should be opened up in the position of fracturing fracture, injection control device II is set in II position of perforation, it is right on oil recovery oil pipe II
Perforation II should be opened up in the position of fracturing fracture, oil recovery control device II is set in II position of perforation；In the two sides of fracturing fracture
Packer II is installed, packer II is arranged in the oil sets annular space of horizontal well II；
Step 4: in producing initial stage, using natural energy is exploited simultaneously to horizontal well I and horizontal well II a period of time, directly
Bottom pressure to two mouthfuls of water horizontal wells drops to bubble point pressure, at this time the injection control device of two mouthfuls of water horizontal wells and control of recovering the oil
Device is open state, and crude oil produces simultaneously from odd level crack and even level crack, and enters the two of respective horizontal well
In a oil pipe；
Step 5: after the bottom pressure of horizontal well I and horizontal well II drops to bubble point pressure, two mouthfuls of water horizontal wells are closed
Injection control device and oil recovery control device；In horizontal well I, the corresponding injection control device I in even level crack is opened, to
CO is injected in injection oil pipe I2, CO2Into even level crack；Simultaneously in horizontal well II, the corresponding injection in odd level crack is opened
Control device II injects CO into injection oil pipe II2, CO2Into odd level crack；
Step 6: closing the well head of horizontal well I and horizontal well II, simultaneously closes off the injection control dress having turned in step 5
I and injection control device II are set, two mouthfuls of water horizontal wells carry out stewing well simultaneously, so that crude oil and CO in stratum2Carry out mixed phase；
Step 7: the well head for opening simultaneously horizontal well I and horizontal well II recovers the oil, and in horizontal well I, opens odd level
The corresponding oil recovery control device I in crack, crude oil are produced from odd level crack, and are entered in oil recovery oil pipe I；In horizontal well II,
The corresponding oil recovery control device II in even level crack is opened, crude oil is produced from even level crack, and is entered in oil recovery oil pipe II；
Step 8: the region between horizontal well I and horizontal well II, even level crack and horizontal well II by horizontal well I
The part crude oil of odd level crack displacement enter in intrinsic fracture, then pass through the odd level crack of horizontal well I and horizontal well
II even level crack extraction；When yield is lower than economic limit, handle up into next round.
Preferably, the asynchronous note CO of the different well of the grouping2The core intersection of oil production method exploitation is greater than 10m.Skill of the invention
Art scheme is that the asynchronous note of different well adopts technology, which can develop the swept volume that the prior art cannot achieve and effect of recovering the oil
Rate., can be on the basis of above-mentioned two mouthfuls of water horizontal wells according to stratum actual conditions and requirement, then the more mouthfuls of horizontal saliva that are successively arranged in parallel are flat
Well, at zip mode cross-distribution, the oil reservoir amplitude that can develop in this way involves the fracturing fracture between adjacent two mouthfuls of water horizontal wells
Volume, sweep efficiency and quantum of output are all very big.
In any of the above-described scheme preferably, in step 1, the horizontal well I and II parallelly distribute on of horizontal well are in oil reservoir
Middle and lower part, exploitation oil reservoir position is free of edge-bottom water, and the pit shaft of two mouthfuls of water horizontal wells is drilled to each along stratum minimum principal stress direction.
The pit shaft parallelly distribute on of two mouthfuls of water horizontal wells exploits oil reservoir position and is free of edge-bottom water, can prevent in water in this way in oil reservoir middle and lower part
Horizontal well pit shaft is partially formed water cone or causes quick water logging, leads to big volume production water.The pit shaft of two mouthfuls of water horizontal wells each along stratum most
Minor principal stress direction is drilled to, and is capable of forming the radial fissure perpendicular to horizontal well pit shaft for subsequent implementation symmetrical expression pressure break.By two
Saliva horizontal well moves round about, is capable of forming the crack of zip mode cross-distribution.
In any of the above-described scheme preferably, the fracturing fracture of the horizontal well I and horizontal well II is at least Pyatyi.
In any of the above-described scheme preferably, it is long to be greater than fracturing fracture half for the spacing of the horizontal well I and horizontal well II
Twice.
In any of the above-described scheme preferably, the spacing of the fracturing fracture is more than or equal to fracturing fracture half long 0.5
Times, and it is less than or equal to long 2 times of fracturing fracture half.
The half of fracturing fracture long (a) is horizontal well casing pipe wall at a distance from fracturing fracture tip；Horizontal well I and horizontal well II
Spacing (L) be two mouthfuls of water horizontal wells the distance between casing wall；The spacing (D) of fracturing fracture is adjacent on water horizontal well
The distance at two fracturing fracture tips.Above-mentioned parameter should comprehensively consider, and mutually coordinated effect should also cooperate other relevant parameters,
Just it is able to achieve desired effect of the invention.Preferably L > 2a, 0.5a≤D≤2a；More preferably 2.5a≤L≤3a,
0.8a≤D≤1.8a。
As L < 2.5a, it is being easy to press to wear the stratum between two mouthfuls of water horizontal wells in fracturing process, is keeping two mouthfuls of water horizontal wells straight
Crack connection was connected, it can not crude oil in effective displacement stratum；As L > 3a, it is further continued for exploitation and has no apparent gain
Effect.If the space D of fracturing fracture, to 2a range, will make it lose harmony between relevant parameter, and cause to infuse beyond 0.5a
Enter CO2Swept volume be greatly lowered, and then reduce production capacity, reduce production efficiency, while also can not be between effective displacement well
Residual oil between seam, it is even more impossible to the regions of bypassed oil in displacement stratum.
In any of the above-described scheme preferably, in step 2, the injection oil pipe I and the oil recovery oil pipe I are and water
The casing of horizontal well I is parallel.
In any of the above-described scheme preferably, the space in I casing of horizontal well is divided into injection and led to by the packer I
Road and oil channel, and injection channel and oil channel are alternately distributed in the oil sets annular space of horizontal well I.Open injection oil
The injection control device I for corresponding to even level crack location on pipe I closes on injection oil pipe I and corresponds to odd level crack location
Injection control device I, and close oil recovery oil pipe I on correspond to all slits oil recovery control device I so that injection oil pipe
Injection channel is formed between I and even level crack.Open the oil recovery control dress for corresponding to odd level crack location on oil recovery oil pipe I
I is set, it is right on the oil recovery control device I on oil recovery oil pipe I corresponding to even level crack location, and closing injection oil pipe I to close
It should be in the injection control device I of all slits, so that forming oil channel between oil recovery oil pipe I and odd level crack.
In any of the above-described scheme preferably, in step 3, the injection oil pipe II and the oil recovery oil pipe II with
The casing of horizontal well II is parallel.
In any of the above-described scheme preferably, the space in II casing of horizontal well is divided into injection by the packer II
Channel and oil channel, and injection channel and oil channel are alternately distributed in the oil sets annular space of horizontal well II.Open note
The injection control device II for entering to correspond on oil pipe II odd level crack location is closed on injection oil pipe II and is split corresponding to even level
The injection control device II of position is stitched, and closes on oil recovery oil pipe II the oil recovery control device II for corresponding to all slits, is made
It must inject between oil pipe II and odd level crack and form injection channel.It opens and corresponds to even level crack location on oil recovery oil pipe II
Oil recovery control device II, close oil recovery oil pipe II on correspond to odd level crack location oil recovery control device II, Yi Jiguan
The injection control device II for corresponding to all slits on injection oil pipe II is closed, so that shape between oil recovery oil pipe II and even level crack
At oil channel.
In any of the above-described scheme preferably, in step 5, due to infusing CO2It is influenced by strata pressure recovery situation,
Therefore in note CO2When observe strata pressure, when being restored to certain strata pressure, stop note CO2.For injection rate, note
Enter that amount is bigger, the degree that pressure is restored on stratum is higher, and then period yield of handling up is bigger, therefore restores pressure on stratum and be not higher than
Under the premise of formation fracture pressure, the higher the better for recovery extent；For injection rate, injection rate is bigger, is restored to one
Time used in fixed strata pressure is shorter, and in the case where being no more than formation fracture pressure, Ying Jinliang takes maximum injection speed
Degree, can shorten injection length, in this way so as to shorten the development cycle.Since the fracture pressure of Different Strata is different, lead to difference
The injection rate on stratum is variant.Note CO of the invention2Oil production method has comprehensively considered half long (a), horizontal well I of fracturing fracture
With the parameters such as the spacing (L) of horizontal well II, the spacing (D) of fracturing fracture, different zones can be generally applicable to, Different Strata is adopted
Oil reduces water filling difficulty, and operability is stronger, and in the case where other conditions are equivalent, can reach biggish oil recovery
Amount.The present invention proves by a large number of experiments, compared with prior art, note CO of the invention2Oil production method, oil production at least improve
20-30%.
In any of the above-described scheme preferably, in step 6, during stewing well, well head oil buckling should be observed in time
Change, when oil pressure fall tends to be steady or fall is less than 0.1MPa, stops stewing well, carry out next step.Due to stewing
The well time is longer, oil and CO2Time swap in the earth formation is longer, and effect is better, but economically and uneconomical, therefore in reality
It needs to be adjusted according to field condition in the operation of border, to realize oil and CO2Be sufficiently displaced from, and then reach maximum oil production.
In any of the above-described scheme preferably, stream is respectively mounted on the injection control device and the oil recovery control device
Quantity sensor.
In any of the above-described scheme preferably, the injection control device and the oil recovery control device pass through cable
It is connect with the real-time management of injection and production system on ground.
In any of the above-described scheme preferably, pass through real-time management of injection and production system monitoring horizontal well I and horizontal well II
Down-hole information is filling the water or is infusing CO2When, when a certain well section occurs that water breakthrough, water logging, there are cracks when intrinsic fracture or fracturing fracture
When turning to so that injection crack and oil recovery crack are interconnected, directly controlled and the well section by controlling real-time management of injection and production system
The closing and unlatching of corresponding injection control device and/or oil recovery control device are split so that injection crack is transformed into oil recovery
Seam, and/or oil recovery crack is transformed into injection crack.
Water filling when, when a certain well section occur water breakthrough, water logging, there are when intrinsic fracture or fracturing fracture crack turn to so that
When injecting crack and interconnected oil recovery crack, the corresponding injection control device in well section crack at this can be closed, be split by other
Seam is filled the water or is infused CO2, when recovering the oil next stage, can oil recovery control device herein be opened, is passed through according to the actual situation
This section of crack and original oil recovery crack are recovered the oil；It during oil extraction, can be by well section crack pair at this when water logging occurs in a certain well section
The oil recovery control device answered is closed, and is recovered the oil by other cracks, fills the water or infuse CO in next stage2When, it can open according to the actual situation
Injection control device herein is opened, is filled the water or infused CO by this section of crack and original injection crack2。
Oil production method of the invention can be combined with intelligent control technology, and real-time management of injection and production system is arranged on the ground,
Down-hole pressure, temperature, note CO are acquired in real time using the permanent sensor that underground is arranged in2The information such as flow, oil recovery flow, and
The signal of acquisition is transferred on ground by cable, is then analyzed and is excavated using data of the software platform to acquisition,
It analyzes and optimizes in combination with reservoir numerical simulation, form reservoir management decision information, and arrive by control system Real-time Feedback
Underground carries out production remote control to oil reservoir, and then improves oil well occurrence.
The asynchronous note CO of the different well of grouping of symmetrical cloth seam of the invention2Oil production method is easily understood, and it is convenient to operate.With benefit
It is compared with the exploitation of stratum elastic energy failure formula, the present invention passes through injection CO2Stratum energy, and displacement crude oil extraction are supplemented, is mentioned
High recovery rate；With using straight well water filling horizontal well production flooding pattern compared with, do not have to individually bore water injection well, reduce operation at
This；Using pour and pluck structure between seam, solve the problems, such as that straight well water filling injection is difficult；Can between effective displacement well, between seam and region of bypassed oil
Residual oil, improve swept volume and oil displacement efficiency；By " handling up ", i.e., the process of stewing well, so that formation crude oil and CO2Into
Row mixed phase further increases injection CO2Flooding Efficiency；Two mouthfuls of water horizontal wells infuse CO simultaneously2, recover the oil simultaneously again after boiling in a covered pot over a slow fire well, improve wave
And volume and oil displacement efficiency；According to on-site actual situations, injection control device and oil recovery control device can be flexibly controlled
It closes and opens, the position in flexible regulation injection crack and oil recovery crack solves water to adapt to the concrete condition on the stratum
Alter, water logging the problems such as.The case where encountering hydraulic fracture and intrinsic fracture is linked up, injection control device and control of recovering the oil can be passed through
Device processed is grouped to hydraulic fracture and coordinated development, while percolation ability high using intrinsic fracture, prevents to the full extent
Sealing alters the problem of with oil well sudden water flooding.
Detailed description of the invention
Fig. 1 is the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2One preferred embodiment of oil production method
Flow diagram；
Fig. 2 is the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2The embodiment illustrated in fig. 1 of oil production method
Fractured horizontal well crack distribution schematic diagram；
Fig. 3 is the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2The embodiment illustrated in fig. 1 of oil production method
Horizontal well I and horizontal well II schematic diagram of internal structure；
Fig. 4 is the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2The embodiment illustrated in fig. 1 of oil production method
Horizontal well I and horizontal well II the injecting process schematic diagram；
Fig. 5 is the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2The embodiment illustrated in fig. 1 of oil production method
Horizontal well I and horizontal well II oil recovery process schematic diagram.
Explanation is marked in figure:
1- horizontal well I, 11- inject oil pipe I, 12- oil recovery oil pipe I, 13- perforation I, 14- injection control device I, 15- oil recovery
Control device I, 16- packer I, 17- odd level crack, 18- even level crack；
2- horizontal well II, 21- injection oil pipe II, 22- oil recovery oil pipe II, 23- perforation II, 24- injection control device II,
25- oil recovery control device II, 26- packer II, 27- odd level crack, 28- even level crack；
The spacing (L) of 3- horizontal well I and horizontal well II；
The half of 4- fracturing fracture is long (a)；
The spacing (D) of 5- fracturing fracture；
6- intrinsic fracture.
Specific embodiment
In order to be further understood that summary of the invention of the invention, the present invention is elaborated below in conjunction with specific embodiment.
Embodiment one:
As shown in Figs. 1-5, the asynchronous note CO of the different well of grouping of symmetrical cloth seam according to the invention2One implementation of oil production method
Example, according to sequencing the following steps are included:
Step 1: in the earth formation by horizontal well I 1 and the parallel arrangement of horizontal well II 2, and two mouthfuls of water horizontal wells are carried out symmetrical
Pressure break is formed a plurality of perpendicular to horizontal well pit shaft and in the fracturing fracture of symmetrical distribution；Region between Liang Koushui horizontal well,
The odd level crack 17 of horizontal well I 1 is connected to the even level crack 28 of horizontal well II 2 by intrinsic fracture 6；
Step 2: installation injection oil pipe I 11 and oil recovery oil pipe I 12 in the casing of horizontal well I 1, on injection oil pipe I 11
Position corresponding to fracturing fracture opens up perforation I 13, injection control device I 14 is arranged in I 13 position of perforation, in oil recovery oil pipe I
Position on 11 corresponding to fracturing fracture opens up perforation I 13, and oil recovery control device I 15 is arranged in I 13 position of perforation；It is split in pressure break
Packer I 16 is installed in the two sides of seam, and packer I 16 is arranged in the oil sets annular space of horizontal well I 1；
Step 3: installation injection oil pipe II 21 and oil recovery oil pipe II 22 in the casing of horizontal well II 2, in injection oil pipe II
Position on 21 corresponding to fracturing fracture opens up perforation II 23, and injection control device II 24 is arranged in II 23 position of perforation, is adopting
Position on oil pipe II 22 corresponding to fracturing fracture opens up perforation II 23, and oil recovery control device II is arranged in II 23 position of perforation
25；Packer II 26 is installed in the two sides of fracturing fracture, packer II 26 is arranged in the oil sets annular space of horizontal well II 2；
Step 4: in producing initial stage, using natural energy is exploited simultaneously to horizontal well I and horizontal well II a period of time, directly
Bottom pressure to two mouthfuls of water horizontal wells drops to bubble point pressure, at this time the injection control device of two mouthfuls of water horizontal wells and control of recovering the oil
Device is open state, and crude oil produces simultaneously from odd level crack and even level crack, and enters the two of respective horizontal well
In a oil pipe；
Step 5: after the bottom pressure of horizontal well I 1 and horizontal well II 2 drops to bubble point pressure, it is flat that two mouthfuls of horizontal saliva are closed
The injection control device and oil recovery control device of well；In horizontal well I 1, the corresponding injection in even level crack 18 control dress is opened
I 14 are set, injects CO into injection oil pipe I 112, CO2Into even level crack 18；Simultaneously in horizontal well II 2, odd level is opened
The corresponding injection control device II 24 in crack 27 injects CO into injection oil pipe II 212, CO2Into odd level crack 27；
Step 6: closing the well head of horizontal well I 1 and horizontal well II 2, simultaneously closes off the injection control having turned in step 5
Device I 14 and injection control device II 24, two mouthfuls of water horizontal wells carry out stewing well simultaneously, so that crude oil and CO in stratum2It is mixed
Phase；
Step 7: the well head for opening simultaneously horizontal well I 1 and horizontal well II 2 recovers the oil, and in horizontal well I 1, opens odd
The corresponding oil recovery control device I 15 in several levels crack 17, crude oil are produced from odd level crack 17, and are entered in oil recovery oil pipe I 12；?
In horizontal well II 2, the corresponding oil recovery control device II 25 in even level crack 28 is opened, crude oil is produced from even level crack 28, and
Into in oil recovery oil pipe II 22；
Step 8: the region between horizontal well I 1 and horizontal well II 2, even level crack 18 and level by horizontal well I 1
The part crude oil of 27 displacement of odd level crack of well II 2 enters in intrinsic fracture 6, then passes through the odd level crack of horizontal well I 1
17 and horizontal well II 2 even level crack 28 produce；When yield is lower than economic limit, handle up into next round.
The asynchronous note CO of the different well of the grouping2The core intersection of oil production method exploitation is 20m.In step 1, I He of horizontal well
II parallelly distribute on of horizontal well exploits oil reservoir position and is free of edge-bottom water in the middle and lower part of oil reservoir, the pit shafts of two mouthfuls of water horizontal wells each along
Stratum minimum principal stress direction is drilled to.The pit shaft parallelly distribute on of two mouthfuls of water horizontal wells is exploited oil reservoir position and is free of in oil reservoir middle and lower part
Edge-bottom water can prevent from being partially formed water cone in horizontal well pit shaft in this way or cause quick water logging, lead to big volume production water.Two mouthfuls of water
The pit shaft of horizontal well is drilled to each along stratum minimum principal stress direction, is capable of forming for subsequent implementation symmetrical expression pressure break perpendicular to level
The radial fissure of well shaft.Two mouthfuls of water horizontal wells are moved round about, are capable of forming the crack of zip mode cross-distribution.
As shown in Fig. 2, the fracturing fracture of the horizontal well I 1 be Pyatyi, be from left to right followed successively by level-one, second level, three-level,
Level Four, Pyatyi；The fracturing fracture of the horizontal well II 2 is six grades, is from left to right followed successively by level-one, second level, three-level, level Four, five
Grade, six grades.
Long (a) 4 of the half of fracturing fracture is horizontal well casing pipe wall at a distance from fracturing fracture tip；Horizontal well I and horizontal well
II spacing (L) 3 is the distance between the casing wall of two mouthfuls of water horizontal wells；The spacing (D) 5 of fracturing fracture is on water horizontal well
The distance at adjacent two fracturing fracture tips.Above-mentioned parameter should comprehensively consider, mutually coordinated effect, should also cooperate other correlation ginsengs
Number, is just able to achieve desired effect of the invention.Wherein L=2.1a, D=0.5a.
In step 2, the injection oil pipe I and the oil recovery oil pipe I are parallel with the casing of horizontal well I.The packer
Space in I casing of horizontal well is divided into injection channel and oil channel by I, and injection channel and oil channel are in horizontal well I
Oil sets annular space in be alternately distributed.The injection control device I for corresponding to even level crack location on injection oil pipe I is opened,
The injection control device I for corresponding to odd level crack location on injection oil pipe I is closed, and closes on oil recovery oil pipe I and corresponds to
The oil recovery control device I of all slits, so that forming injection channel between injection oil pipe I and even level crack.Open the oil that recovers the oil
The oil recovery control device I for corresponding to odd level crack location on pipe I, closes and corresponds to even level crack location on oil recovery oil pipe I
Oil recovery control device I, and close injection oil pipe I on correspond to all slits injection control device I so that oil recovery oil pipe
Oil channel is formed between I and odd level crack.
In step 3, the injection oil pipe II and the oil recovery oil pipe II are parallel with the casing of horizontal well II.The envelope
The space in II casing of horizontal well is divided into injection channel and oil channel every device II, and injection channel and oil channel are in water
It is alternately distributed in the oil sets annular space of horizontal well II.Open the injection control for corresponding to odd level crack location on injection oil pipe II
Device II closes the injection control device II for corresponding to even level crack location on injection oil pipe II, and closes oil recovery oil pipe
Correspond to the oil recovery control device II of all slits on II, so that it is logical to form injection between injection oil pipe II and odd level crack
Road.The oil recovery control device II for corresponding to even level crack location on oil recovery oil pipe II is opened, is closed corresponding on oil recovery oil pipe II
In the oil recovery control device II of odd level crack location, and close the injection control for corresponding to all slits on injection oil pipe II
Device II, so that forming oil channel between oil recovery oil pipe II and even level crack.
In step 5, due to infusing CO2It is influenced by strata pressure recovery situation, therefore in note CO2When observe strata pressure,
When being restored to certain strata pressure, stop note CO2.For injection rate, injection rate is bigger, and the journey of pressure is restored on stratum
Spend higher, and then period yield of handling up is bigger, therefore under the premise of stratum restores pressure and is not higher than formation fracture pressure, restores
The higher the better for degree；For injection rate, injection rate is bigger, is restored to the time used in certain strata pressure and gets over
Short, in the case where being no more than formation fracture pressure, Ying Jinliang takes maximum injection rate, can shorten injection length in this way,
So as to shorten the development cycle.Since the fracture pressure of Different Strata is different, cause the injection rate of Different Strata variant.This reality
Apply the note CO of example2Oil production method has comprehensively considered half long (a) of fracturing fracture, the spacing (L) of horizontal well I and horizontal well II, pressure
The parameters such as the spacing (D) in crack, can be generally applicable to the oil recovery of different zones, Different Strata, reduce note CO2Difficulty, can
Operability is stronger, and in the case where other conditions are equivalent, can reach biggish oil production.
In step 6, during stewing well, well head oil buckling should be observed in time, tend to be steady to oil pressure fall or
When fall is less than 0.1MPa, stops stewing well, carry out next step.Since the stewing well time is longer, oil and CO2In the earth formation
Time swap is longer, and effect is better, but economically and uneconomical, therefore needs to carry out according to field condition in actual operation
Adjustment, to realize oil and CO2Be sufficiently displaced from, and then reach maximum oil production.
The present embodiment proves by a large number of experiments, compared with prior art, the note CO of the present embodiment2Oil production method recovers the oil
Amount improves 26%.
Water filling when, when a certain well section occur water breakthrough, water logging, there are when intrinsic fracture or fracturing fracture crack turn to so that
When injecting crack and interconnected oil recovery crack, the corresponding injection control device in well section crack at this can be closed, be split by other
Seam carries out note CO2, when recovering the oil next stage, can oil recovery control device herein be opened, is split by the section according to the actual situation
Seam and original oil recovery crack are recovered the oil；During oil extraction, it when water logging occurs in a certain well section, can adopt well section crack is corresponding at this
Oily control device is closed, and is recovered the oil by other cracks, infuses CO in next stage2When, injection herein can be opened according to the actual situation
Control device carries out note CO by this section of crack and original injection crack2。
The asynchronous note CO of the different well of grouping of the symmetrical cloth seam of the present embodiment2Oil production method is easily understood, and it is convenient to operate.With
It is compared using the exploitation of stratum elastic energy failure formula, the present embodiment passes through injection CO2Stratum energy is supplemented, and displacement exploitation is former
Oil improves recovery ratio；Compared with using the flooding pattern of straight well water filling horizontal well production, does not have to individually bore water injection well, reduce and make
Industry cost；Using pour and pluck structure between seam, solve the problems, such as that straight well water filling injection is difficult；Can between effective displacement well, it is between seam and dead
The residual oil in oily area improves swept volume and oil displacement efficiency；By " handling up ", i.e., the process of stewing well so that formation crude oil with
CO2Mixed phase is carried out, injection CO is further increased2Flooding Efficiency；Two mouthfuls of water horizontal wells infuse CO simultaneously2, it recovers the oil simultaneously again after boiling in a covered pot over a slow fire well,
Improve swept volume and oil displacement efficiency；According to on-site actual situations, injection control device can be flexibly controlled and control of recovering the oil
The closing and unlatching of device, the position in flexible regulation injection crack and oil recovery crack, to adapt to the concrete condition on the stratum,
The problems such as solving water breakthrough, water logging.Encountering the case where hydraulic fracture and intrinsic fracture are linked up, can by injection control device and
Oil recovery control device is grouped to hydraulic fracture and coordinated development, while percolation ability high using intrinsic fracture, maximum journey
The problem of water breakthrough and oil well sudden water flooding are prevented on degree.
Embodiment two:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=2.3a, space D=0.8a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments,
Compared with prior art, the note CO of the present embodiment2Oil production method, oil production improve 29%.
Embodiment three:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=2.5a, space D=a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments, with
The prior art is compared, the note CO of the present embodiment2Oil production method, oil production improve 30%.
Example IV:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=2.6a, space D=1.2a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments,
Compared with prior art, the note CO of the present embodiment2Oil production method, oil production improve 27%.
Embodiment five:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=2.7a, space D=1.5a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments,
Compared with prior art, the note CO of the present embodiment2Oil production method, oil production improve 24%.
Embodiment six:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=2.8a, space D=1.8a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments,
Compared with prior art, the note CO of the present embodiment2Oil production method, oil production improve 26%.
Embodiment seven:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are the same as example 1, unlike: between horizontal well I and horizontal well II
Away from L=3a, space D=2a of fracturing fracture, wherein a is half length of fracturing fracture.The present embodiment proves by a large number of experiments, and existing
There is technology to compare, the note CO of the present embodiment2Oil production method, oil production improve 29%.
Embodiment eight:
The asynchronous note CO of the different well of grouping of symmetrical expression cloth seam according to the invention2Another embodiment of oil production method, note are adopted
Step, cloth seam mode, principle and beneficial effect etc. are identical as any one of embodiment one to seven, unlike: the present embodiment
Oil production method combines intelligent control technology, and real-time management of injection and production system is arranged on the ground, using the permanent of underground is arranged in
Property sensor acquire in real time down-hole pressure, temperature, note CO2The information such as flow, oil recovery flow, and pass through cable for the signal of acquisition
It is transferred on ground, is then analyzed and excavated using data of the software platform to acquisition, in combination with reservoir numerical simulation
Analysis and optimization form reservoir management decision information, and produce to oil reservoir distant to underground by control system Real-time Feedback
Control, and then improve oil well occurrence.
Flow sensor is respectively mounted on the injection control device and oil recovery control device of two mouthfuls of water horizontal wells；Two mouthfuls of water horizontal wells
Injection control device and oil recovery control device pass through cable and connect with the real-time management of injection and production system on ground.By infusing in real time
The down-hole information for adopting management system level monitoring well I and horizontal well II, in note CO2When, when a certain well section occur water breakthrough, water logging,
It is real-time by controlling when turned to there are crack when intrinsic fracture or fracturing fracture so that injection crack and oil recovery crack are interconnected
Management of injection and production system directly controls the closing of injection control device corresponding with the well section and/or oil recovery control device and opens
It opens, so that injection crack is transformed into oil recovery crack, and/or oil recovery crack is transformed into injection crack.
It will be apparent to those skilled in the art that the asynchronous note CO of the different well of grouping that symmetrical cloth of the invention stitches2Oil production method
Each section shown by summary of the invention and specific embodiment part and attached drawing including aforementioned present invention specification it is any
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 (10)
1. a kind of asynchronous note CO of the different well of grouping of symmetrical expression cloth seam2Oil production method, according to sequencing the following steps are included:
Step 1: in the earth formation by horizontal well I and the parallel arrangement of horizontal well II, and carrying out symmetrical pressure break to two mouthfuls of water horizontal wells,
It is formed a plurality of perpendicular to horizontal well pit shaft and in the fracturing fracture of symmetrical distribution；Region between Liang Koushui horizontal well, it is horizontal
The odd level crack of well I is connected to the even level crack of horizontal well II by intrinsic fracture；
Step 2: installation injection oil pipe I and oil recovery oil pipe I in the casing of horizontal well I correspond to pressure break on injection oil pipe I
The position in crack opens up perforation I, and injection control device I is arranged in I position of perforation, fracturing fracture is corresponded on oil recovery oil pipe I
Position open up perforation I, I position of perforation be arranged oil recovery control device I；Packer I, packing are installed in the two sides of fracturing fracture
Device I is arranged in the oil sets annular space of horizontal well I；
Step 3: installation injection oil pipe II and oil recovery oil pipe II in the casing of horizontal well II correspond on injection oil pipe II
The position of fracturing fracture opens up perforation II, and injection control device II is arranged in II position of perforation, corresponds on oil recovery oil pipe II
The position of fracturing fracture opens up perforation II, and oil recovery control device II is arranged in II position of perforation；It is installed in the two sides of fracturing fracture
Packer II, packer II are arranged in the oil sets annular space of horizontal well II；
Step 4: in producing initial stage, using natural energy is exploited simultaneously to horizontal well I and horizontal well II a period of time, until two
The bottom pressure of saliva horizontal well drops to bubble point pressure, at this time the injection control device I, II of two mouthfuls of water horizontal wells and control of recovering the oil
Device I, II is open state, and crude oil produces simultaneously from odd level crack and even level crack, and enters respective horizontal well
Two oil pipes in；
Step 5: after the bottom pressure of horizontal well I and horizontal well II drops to bubble point pressure, the note of two mouthfuls of water horizontal wells is closed
Enter control device I, II and oil recovery control device I, II；In horizontal well I, the corresponding injection control device in even level crack is opened
I, CO is injected into injection oil pipe I2, CO2Into even level crack；Simultaneously in horizontal well II, it is corresponding to open odd level crack
Injection control device II injects CO into injection oil pipe II2, CO2Into odd level crack；
Step 6: the well head of horizontal well I and horizontal well II is closed, the injection control device I having turned in step 5 is simultaneously closed off
With injection control device II, two mouthfuls of water horizontal wells carry out stewing well simultaneously, so that crude oil and CO in stratum2Carry out mixed phase；
Step 7: the well head for opening simultaneously horizontal well I and horizontal well II recovers the oil, and in horizontal well I, opens odd level crack
Corresponding oil recovery control device I, crude oil are produced from odd level crack, and are entered in oil recovery oil pipe I；In horizontal well II, open
The corresponding oil recovery control device II in even level crack, crude oil are produced from even level crack, and are entered in oil recovery oil pipe II；
Step 8: the region between horizontal well I and horizontal well II, by the even level crack of horizontal well I and the surprise of horizontal well II
The part crude oil of several levels crack displacement enters in intrinsic fracture, then passes through the odd level crack of horizontal well I and horizontal well II
The extraction of even level crack；When yield is lower than economic limit, handle up into next round.
2. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as described in claim 12Oil production method, it is characterised in that: the grouping
The different asynchronous note CO of well2The core intersection of oil production method exploitation is greater than 10m.
3. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as described in claim 12Oil production method, it is characterised in that: step 1
In, the horizontal well I and II parallelly distribute on of horizontal well exploit oil reservoir position and are free of edge-bottom water, Liang Koushui in the middle and lower part of oil reservoir
The pit shaft of horizontal well is drilled to each along stratum minimum principal stress direction.
4. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as claimed in claim 32Oil production method, it is characterised in that: the water
The fracturing fracture of horizontal well I and horizontal well II is at least Pyatyi.
5. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as claimed in claim 42Oil production method, it is characterised in that: the water
The spacing of horizontal well I and horizontal well II is greater than fracturing fracture half long twice.
6. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as claimed in claim 52Oil production method, it is characterised in that: the pressure
The spacing in crack is more than or equal to long 0.5 times of fracturing fracture half, and is less than or equal to long 2 times of fracturing fracture half.
7. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as described in claim 12Oil production method, it is characterised in that: step 2
In, the injection oil pipe I and the oil recovery oil pipe I are parallel with the casing of horizontal well I.
8. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as claimed in claim 72Oil production method, it is characterised in that: the envelope
The space in I casing of horizontal well is divided into injection channel and oil channel every device I, and injection channel and oil channel are in level
It is alternately distributed in the oil sets annular space of well I.
9. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as described in claim 12Oil production method, it is characterised in that: step 3
In, the injection oil pipe II and the oil recovery oil pipe II are parallel with the casing of horizontal well II.
10. the asynchronous note CO of the different well of grouping of symmetrical expression cloth seam as claimed in claim 92Oil production method, it is characterised in that: described
Space in II casing of horizontal well is divided into injection channel and oil channel by packer II, and injection channel and oil channel exist
It is alternately distributed in the oil sets annular space of horizontal well II.
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| CN108457629A (en) * | 2018-02-02 | 2018-08-28 | 中国石油大学(华东) | A kind of method that CO_2 stimulation turns the fine and close oil of drive exploitation |
| CN109209306B (en) * | 2018-09-12 | 2021-03-30 | 中国石油天然气股份有限公司 | Horizontal well CO injection for ultra-low permeability tight oil reservoir2Asynchronous throughput energy supplementing method |
| CN110618255B (en) * | 2019-10-24 | 2021-10-08 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | Confining pressure test device for simulating stratum accumulation, installation method and test method |
| CN111411929A (en) * | 2019-12-26 | 2020-07-14 | 大庆油田有限责任公司 | Horizontal well immovable string staged fracturing physical simulation tool and zipper type fracturing simulation experiment method |
| CN114839347B (en) * | 2022-03-21 | 2023-08-15 | 中国石油大学(北京) | Asynchronous CO injection for different wells 2 Throughput experiment system and method |
| WO2024060415A1 (en) * | 2022-09-21 | 2024-03-28 | 中国石油化工股份有限公司 | Asynchronous cycle-based oil extraction apparatus, method and system |
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