CN109915096A - Method for steam-assisted gravity drainage in later huff and puff period of thickened oil horizontal well - Google Patents
Method for steam-assisted gravity drainage in later huff and puff period of thickened oil horizontal well Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010796 Steam-assisted gravity drainage Methods 0.000 title claims abstract description 10
- 238000011084 recovery Methods 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims abstract description 22
- 238000004891 communication Methods 0.000 claims abstract description 9
- 238000000605 extraction Methods 0.000 claims abstract description 5
- 238000002347 injection Methods 0.000 claims description 32
- 239000007924 injection Substances 0.000 claims description 32
- 230000035699 permeability Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
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- 238000006073 displacement reaction Methods 0.000 claims description 8
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- 239000007788 liquid Substances 0.000 claims description 5
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- 239000003921 oil Substances 0.000 abstract description 100
- 239000000295 fuel oil Substances 0.000 abstract description 6
- 238000005553 drilling Methods 0.000 abstract description 4
- 238000010793 Steam injection (oil industry) Methods 0.000 description 17
- 238000005065 mining Methods 0.000 description 5
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- 241001503485 Mammuthus Species 0.000 description 1
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 238000010795 Steam Flooding Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000010779 crude oil Substances 0.000 description 1
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Abstract
The invention provides a method for steam assisted gravity drainage at the later period of huff and puff of a thickened oil horizontal well, which comprises the following steps of: step S1: drilling a huff-and-puff horizontal well in the oil reservoir area to perform production operation on an oil layer of the oil reservoir area, and huff-and-puff the horizontal well to enable part of the oil reservoir area to form a first heating zone; step S2: after the first preset time, an adding horizontal well is added in the oil reservoir area to carry out production operation on the oil layer of the oil reservoir area, and the adding horizontal well is added to enable the other part of the oil reservoir area to form a second heating zone; step S3: and after the second preset time, the first heating zone is in thermal communication with the second heating zone, and then a horizontal well is added for continuously injecting steam into the oil reservoir area and continuously producing the horizontal well until the oil extraction of the oil reservoir area is finished. By adopting the method for the combined exploitation of the heavy oil reservoir and the horizontal well, the reservoir utilization rate of an oil reservoir area can be effectively improved, and the recovery ratio is improved.
Description
Technical field
The present invention relates to technical field of petroleum extraction, turn steam in particular to a kind of thick oil horizontal well later period of handling up
The method of assisted gravity drainage.
Background technique
The horizontal well technology of handling up is one of effective means of Development of Viscous Crude Oil, and application range is big, and scale is wide.Horizontal well gulps down
Spit that initial stage of development yield is higher, but with the increase of production round, the production time in period extends, and production decline is fast, rate of oil production compared with
Low, recovery percent of reserves is low.For viscosity compared with mammoth pool, handles up and involve that radius is small, and oil reservoir development degree is restricted.Conventional level
Well later period of handling up turns horizontal well vapour and drives mode, and steam injection horizontal well is located at two production level well middle positions, and steam injection well is from producing well
Farther out, based on steam flooding, steam single-point or one direction is easy to cause to break through, manipulation difficulty is big, causes oil-producing low efficiency
Problem.
Summary of the invention
The main purpose of the present invention is to provide a kind of thick oil horizontal well later periods of handling up to turn the side of steam assisted gravity drainage
Method, to solve the problems, such as oil-producing low efficiency in the prior art.
To achieve the goals above, according to an aspect of the invention, there is provided a kind of thick oil horizontal well is handled up, the later period turns
The method of steam assisted gravity drainage, method is the following steps are included: step S1: boring throughput level well to reservoir region in reservoir region
Oil reservoir carries out production operation, and throughput level well makes the reservoir region of part form the first heating tape；Step S2: through the first preset time
Afterwards, pitch-based sphere well being added in reservoir region and production operation being carried out to the oil reservoir of reservoir region, pitch-based sphere well makes the oil of another part
Tibetan area forms the second heating tape；Step S3: after the second preset time, thermal communication is established in the first heating tape and the second heating tape
Afterwards, pitch-based sphere well is for persistently injecting steam to reservoir region, until terminating to reservoir region oil recovery, wherein horizontal well is held
Continuous production model.
Further, the thickness of oil reservoir is greater than or equal to 8m；The porosity of oil reservoir is greater than 0.2；The horizontal permeability of oil reservoir
Greater than 500mD；The vertical permeability of oil reservoir and the ratio of horizontal permeability are greater than 0.5；The oil saturation of oil reservoir is greater than 0.5；
Oil reservoir oil viscosity at 50 DEG C is less than 50000mPa.s.
Further, throughput level well is multiple, and multiple throughput level wells are opened in the bottom section of oil reservoir, two neighboring
The distance between throughput level well is L, wherein 60m≤L≤100m.
Further, in step S2 further include: after the first preset time, when the recovery ratio of throughput level well is greater than or waits
When 20%, throughput level well is closed until handling up when the pressure depth pressure and hydrostatic pressure corresponding with oil reservoir of oil reservoir is equal
The oblique upper of horizontal well opens up pitch-based sphere well.
Further, in step S2, pitch-based sphere well uses thermal cycle oil production method, uses long tube by pitch-based sphere well
Steam is injected to reservoir region, is recovered the oil using oil reservoir of the short tube to reservoir region, wherein the mass dryness fraction of the steam of long tube injection is greater than
60%；The speed of the steam of long tube injection is v1, wherein 60t/d≤v1≤1000t/d；The pressure of steam of long tube injection is
P1, the formation fracture pressure of reservoir region are P2, wherein P1≤10%P2 or P1≤15%P2；The production-injection ratio of reservoir region is
T1, wherein 0.8≤t1≤1.
Further, in step s 2, the method that pitch-based sphere well uses huff and puff oil recovery, wherein pass through pitch-based sphere well
The mass dryness fraction for injecting the steam of reservoir region is greater than 60%；The speed that pitch-based sphere well injects the steam of reservoir region is v2, wherein
200t/d≤v2≤300t/d；The gas injection intensity that pitch-based sphere well injects the steam of reservoir region is Q, wherein 8t/m≤Q≤20t/
m；The pressure that pitch-based sphere well injects the steam of reservoir region is less than the formation fracture pressure of reservoir region；The production-injection ratio of reservoir region is
T2, wherein 0.7≤t2≤1.2.
Further, after the second preset time, the viscosity of crude between throughput level well and pitch-based sphere well be less than or
Equal to 100mPa.s.
Further, in step S3, it is greater than 60% by the mass dryness fraction that pitch-based sphere well injects the steam of reservoir region；Add water
The speed that horizontal well injects the steam of reservoir region is v3, wherein 50t/d≤v3≤70t/d；Reservoir region is injected by pitch-based sphere well
Maximum gas injection pressure be P3, the formation fracture pressure of reservoir region is P4, wherein P3≤15%P4 or P3≤20%P4.
Further, in step S3, the absolute value of the difference of the pressure and the pressure of throughput level well of pitch-based sphere well is less than
0.5MPa。
Further, in step S3, the liquid outlet quantity and pitch-based sphere well and throughput level well of throughput level well extraction are injected
The ratio of the quantity of steam of reservoir region is q, wherein 1≤q≤1.2.
Further, pitch-based sphere well spacing it is vertical from throughput level well on displacement be L1, pitch-based sphere well spacing is from handling up
The displacement of the horizontal direction of horizontal well is L2, wherein 3m≤L1≤5m, 6m≤L2≤15m.
Further, pitch-based sphere well is set in parallel with throughput level well, the length of the horizontal segment of pitch-based sphere well with
The length of the horizontal segment of throughput level well is identical, alternatively, the length of the horizontal segment of pitch-based sphere well and two to three throughput levels
It is the length of the horizontal segment of well and identical.
It applies the technical scheme of the present invention, using the method for horizontal wells in heavy oil reservoir combination exploitation, can effectively mention
The high reservoir utilization rate to oil reservoir region, while improving recovery ratio.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic diagram of the embodiment of the position of pitch-based sphere well according to the present invention and throughput level well；
Fig. 2 shows the signals of embodiment when the first heating tape according to the present invention and the second heating tape generation thermal communication
Figure；
Fig. 3 show thick oil horizontal well according to the present invention handle up the later period turn steam assisted gravity drainage method process
Figure.
Wherein, the above drawings include the following reference numerals:
10, throughput level well；20, pitch-based sphere well；A, the first heating tape；B, top of oil horizon；C, oil reservoir bottom；F1, steaming
Vapour；F2, non-condensate gas；F3, hot oil and condensed liquid；M, the second heating tape.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
It should be noted that term " first ", " second " etc. in the description and claims of this application and attached drawing
It is to be used to distinguish similar objects, without being used to describe a particular order or precedence order.It should be understood that the art used in this way
Language is interchangeable under appropriate circumstances, so that presently filed embodiment described herein for example can be in addition to illustrating herein
Or the sequence other than those of description is implemented.In addition, term " includes " and " having " and their any deformation, it is intended that
Cover it is non-exclusive include, for example, containing the process, method, system, product or equipment of a series of steps or units need not limit
In step or unit those of is clearly listed, but may include be not clearly listed or for these process, methods, produce
The other step or units of product or equipment inherently.
For ease of description, spatially relative term can be used herein, as " ... on ", " ... top ",
" ... upper surface ", " above " etc., for describing such as a device shown in the figure or feature and other devices or spy
The spatial relation of sign.It should be understood that spatially relative term is intended to comprising the orientation in addition to device described in figure
Except different direction in use or operation.For example, being described as if the device in attached drawing is squeezed " in other devices
It will be positioned as " under other devices or construction after part or construction top " or the device of " on other devices or construction "
Side " or " under other devices or construction ".Thus, exemplary term " ... top " may include " ... top " and
" in ... lower section " two kinds of orientation.The device can also be positioned with other different modes and (is rotated by 90 ° or in other orientation), and
And respective explanations are made to the opposite description in space used herein above.
Now, the illustrative embodiments according to the application are more fully described with reference to the accompanying drawings.However, these are exemplary
Embodiment can be implemented by many different forms, and should not be construed to be limited solely to embodiment party set forth herein
Formula.It should be understood that it is thoroughly and complete to these embodiments are provided so that disclosure herein, and these are shown
The design of example property embodiment is fully conveyed to those of ordinary skill in the art, in the accompanying drawings, for the sake of clarity, it is possible to expand
The big thickness of layer and region, and make that identical device is presented with like reference characters, thus omission retouches them
It states.
In conjunction with shown in Fig. 1 to Fig. 3, turn to steam according to an embodiment of the invention, providing a kind of thick oil horizontal well later period of handling up
The method of vapour assisted gravity drainage.
Specifically, method includes the following steps: step S1: reservoir region bore throughput level well to the oil reservoir of reservoir region into
Row production operation, throughput level well make the reservoir region of part form the first heating tape.Step S2: after the first preset time,
Reservoir region adds pitch-based sphere well and carries out production operation to the oil reservoir of reservoir region, and pitch-based sphere well makes the reservoir region shape of another part
At the second heating tape.Step S3: after the second preset time, after thermal communication is established with the second heating tape in the first heating tape, addition
Horizontal well is for persistently injecting steam to reservoir region, until terminating to reservoir region oil recovery, during this, horizontal well keeps continuing
Production model.
In the present embodiment, it using the method for horizontal wells in heavy oil reservoir combination exploitation, can effectively improve to oil
The reservoir utilization rate in Tibetan area domain, while improving recovery ratio.I.e. the mining method newly bores addition well above throughput level hole deviation,
Two wells are produced in a manner of steam assisted gravity drainage can effectively improve reservoir utilization rate, greatly improve horizontal wells in heavy oil reservoir
It handles up later period recovery ratio.The mining method newly bores addition well above throughput level hole deviation, can avoid low oil-containing saturation after handling up
Band is spent, while drilling risk can be reduced.
Specifically, the thickness of oil reservoir is greater than or equal to 8m, and the porosity of oil reservoir is greater than 0.2, and the horizontal permeability of oil reservoir is big
In 500mD, the vertical permeability of oil reservoir and the ratio of horizontal permeability are greater than 0.5, and the oil saturation of oil reservoir is greater than 0.5；Oil
Layer oil viscosity at 50 DEG C is less than 50000mPa.s.
Throughput level well can be to be multiple, and multiple throughput level wells are opened in the bottom section of oil reservoir, two neighboring to handle up
The distance between horizontal well is L, wherein 60m≤L≤100m.
It wherein, further include after the first preset time, when the recovery ratio of throughput level well is greater than or equal in step S2
When 20%, throughput level well is closed when the pressure depth pressure and hydrostatic pressure corresponding with oil reservoir of oil reservoir is equal, in water of handling up
The oblique upper of horizontal well opens up pitch-based sphere well.
In step s 2, pitch-based sphere well uses thermal cycle oil production method, uses long tube to oil reservoir by pitch-based sphere well
Steam is injected in area, is recovered the oil using oil reservoir of the short tube to reservoir region, wherein and the mass dryness fraction of the steam of long tube injection is greater than 60%,
The speed of the steam of long tube injection is v1, wherein 60t/d≤v1≤1000t/d, the pressure of the steam of long tube injection are P1, oil
The formation fracture pressure of Tibetan area is P2, wherein P1≤10%P2 or P1≤15%P2；The production-injection ratio of reservoir region is t1,
In, 0.8≤t1≤1.
Certainly, in step s 2, the method that pitch-based sphere well can also use huff and puff oil recovery, wherein pass through pitch-based sphere
The mass dryness fraction that well injects the steam of reservoir region is greater than 60%, and the speed that pitch-based sphere well injects the steam of reservoir region is v2, wherein
200t/d≤v2≤300t/d.The gas injection intensity that pitch-based sphere well injects the steam of reservoir region is Q, wherein 8t/m≤Q≤20t/
m.The pressure that pitch-based sphere well injects the steam of reservoir region is less than the formation fracture pressure of reservoir region, and the production-injection ratio of reservoir region is
T2, wherein 2-7 days well time is boiled in a covered pot over a slow fire in 0.7≤t2≤1.2.
Further, after the second preset time, the viscosity of crude between throughput level well and pitch-based sphere well be less than or
Equal to 100mPa.s.
In step s3, the mass dryness fraction that the steam of reservoir region is injected by pitch-based sphere well is greater than 60%, pitch-based sphere well note
The speed for entering the steam of reservoir region is v3, wherein 50t/d≤v3≤70t/d.The maximum of reservoir region is injected by pitch-based sphere well
Gas injection pressure is P3, and the formation fracture pressure of reservoir region is P4, wherein P3≤15%P4 or P3≤20%P4.Pitch-based sphere
The absolute value of the difference of the pressure of the pressure and throughput level well of well is less than 0.5MPa.The liquid outlet quantity and addition of throughput level well extraction
The ratio of the quantity of steam of horizontal well and throughput level well injection reservoir region is q, wherein 1≤q≤1.2.
Specifically, this method comprises: preferred levels well is handled up the later period be suitble to condition target reservoir, on horizontal hole deviation top
New to bore a bite pitch-based sphere well, pitch-based sphere well is recycled or is handled up production, after two horizontal wells establish thermal communication, pitch-based sphere
Well continues steam injection, and raw water horizontal well continuous production maintains balanced flood, until terminating.Using the effective raising reservoir utilization rate,
Greatly improve recovery ratio.Wherein, after two horizontal wells establish thermal communication, pitch-based sphere well switchs to continue steam injection, and raw water horizontal well continues
In production process, adjustment note adopts parameter, maintains balanced flood, until terminating.
The application provides a kind of horizontal wells in heavy oil reservoir and handles up the method that the later period improves recovery ratio, which can be
Horizontal well is handled up the later period, is combined by new horizontal well drilling with raw water horizontal well, is produced in a manner of steam assisted gravity drainage, substantially mentioned
High viscous oil oil recovery.First preferred levels well handle up the later period be suitble to condition target reservoir, select proper moment in level
Newly bore a bite pitch-based sphere well in hole deviation top；Pitch-based sphere well is recycled or is handled up production later, when two horizontal wells establish heat
After connection, pitch-based sphere well continues steam injection, and raw water horizontal well continuous production maintains balanced flood, until terminating.The present invention can have
The raising reservoir utilization rate of effect, greatly improves recovery ratio.
The coarse sizing for being suitble to oil reservoir is carried out in this method first, in the oil reservoir for handling up technological development using horizontal well,
Select reservoir oil layer thickness >=8m, oil reservoir porosity > 0.2, horizontal permeability > 500mD, vertical permeability and horizontal permeability ratio
Value > 0.5, oil saturation > 0.5,50 DEG C oil viscosity < 50000mPa.s, horizontal well disposes well spacing 60- in oil reservoir
100m, it is vertical upper positioned at oil reservoir middle and lower part.
When throughput level well is handled up more wheels, recovery ratio up to 20% or more, close to handle up economic limit when, closing well.Work as pressure
When being down to corresponding depth pressure and hydrostatic pressure, a bite pitch-based sphere well is bored in horizontal well oblique upper, considers handle up heated perimeter and brill
Well requirement, the displacement on pitch-based sphere well spacing is vertical from throughput level well are L1, water of the pitch-based sphere well spacing from throughput level well
Square to displacement be L2, wherein 3m≤L1≤5m, 6m≤L2≤15m.Pitch-based sphere well is set in parallel with throughput level well
It sets, the length of the horizontal segment of pitch-based sphere well is identical as the length of the horizontal segment of throughput level well, alternatively, the water of pitch-based sphere well
The length of flat section with it is the length of the horizontal segment of two to three throughput level wells and identical.
Specifically, oil reservoir coarse sizing, selected oil reservoir buried depth 450m, core intersection 9.4m, oil reservoir porosity 0.28, water are carried out
Flat permeability 815mD, vertical permeability and horizontal permeability ratio 0.6, oil saturation 0.68 are developed in oil reservoir discontinuous
Lithology, physical property interlayer, 2.1 ten thousand centipoise of degassed crude viscosity under the conditions of 50 DEG C.
The reservoir horizontal well has been handled up 14 wheels, recovery percent of reserves 21.2%, accumulates gas oil ratio 0.113, well spacing 70m, horizontal well
Away from oil reservoir bottom 2m, horizontal section length 240m；At away from throughput level well vertical deviation 4m, horizontal displacement 10m and throughput level
Well disposes a bite pitch-based sphere well, horizontal section length 240m in parallel.
Pitch-based sphere well long tube steam injection, short tube recover the oil, and carry out circulation production.Steam injection rate is 60-80t/d, steam injection pressure
4.5-5.0MPa, production-injection ratio 0.9 establish thermal communication between well after recycling 0.5 year.
Addition well continues steam injection, throughput level well continuous production after establishing connection, and injection steam quality is greater than 60%, steam injection
Speed is 50t/d-60t/d, and steam injection pressure 4.5-5.5MPa, less than 0.5MPa, control whole production-injection ratio is two horizontal well pressure differences
1.0-1.2 until terminating.
The average daily yield of the mining method can reach 6t/d, and ultimate recovery latter stage of relatively handling up improves 30.5 percentage points, oil
Vapour is than improving 0.02.
According to another embodiment of the application, oil reservoir coarse sizing, selected oil reservoir buried depth 440m, core intersection are carried out
8.5m, oil reservoir porosity 0.27, horizontal permeability 960mD, vertical permeability and horizontal permeability ratio 0.6, oil saturation
0.68, discontinuous lithology, physical property interlayer are developed in oil reservoir, 1.5 ten thousand centipoise of degassed crude viscosity under the conditions of 50 DEG C.
The reservoir horizontal well has been handled up 13 wheels, recovery percent of reserves 20.5%, accumulates gas oil ratio 0.108, well spacing 70m, horizontal well
Away from oil reservoir bottom 2m, horizontal section length 200m；At away from throughput level well vertical deviation 4.5m, horizontal displacement 12m with handle up water
Horizontal well disposes a bite pitch-based sphere well, horizontal section length 450m in parallel.
Pitch-based sphere well long tube steam injection, short tube recover the oil, and carry out circulation production；Steam injection rate is 60-80t/d；Steam injection pressure
4.5-5.0MPa, production-injection ratio 0.9 establish thermal communication between well after recycling 0.4 year.
Addition well continues steam injection, throughput level well continuous production after establishing connection, and injection steam quality is greater than 60%, steam injection
Speed is 60t/d-80t/d, and steam injection pressure 4.5-5.5MPa, less than 0.5MPa, control whole production-injection ratio is two horizontal well pressure differences
1.0-1.2 until terminating.
The average daily yield of the mining method can reach 13t/d, and ultimate recovery latter stage of relatively handling up improves 32.1 percentage points, oil
Vapour is than improving 0.02.
The mining method newly bores pitch-based sphere well above throughput level hole deviation, and two wells are in a manner of steam assisted gravity drainage
Production can effectively improve reservoir utilization rate, greatly improve horizontal wells in heavy oil reservoir and handle up later period recovery ratio.It can avoid handling up
Low oil saturation sandstone band afterwards, while drilling risk can be reduced.Wherein, in fig. 1 and 2,10 be throughput level well, and 20 be to add
Add horizontal well, A is the first heating tape, and B is top of oil horizon, and C is oil reservoir bottom, and F1 is steam, and F2 is non-condensate gas, and F3 is hot oil
And condensed liquid, M are the second heating tape.
Than that described above, it is also necessary to which explanation is " one embodiment " spoken of in the present specification, " another implementation
Example ", " embodiment " etc. refer to that specific features, structure or the feature of embodiment description is combined to be included in the application summary
Property description at least one embodiment in.It is not centainly to refer to the same reality that statement of the same race, which occur, in multiple places in the description
Apply example.Furthermore, it is understood that is advocated is knot when describing a specific features, structure or feature in conjunction with any embodiment
Other embodiments are closed to realize that this feature, structure or feature are also fallen within the scope of the present invention.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, reference can be made to the related descriptions of other embodiments.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of thick oil horizontal well is handled up, the later period turns the method for steam assisted gravity drainage, which is characterized in that the method includes
Following steps:
Step S1: throughput level well is bored in reservoir region, production operation, the throughput level well are carried out to the oil reservoir of the reservoir region
The reservoir region of part is set to form the first heating tape；
Step S2: after the first preset time, pitch-based sphere well is added in the reservoir region, the oil reservoir of the reservoir region is carried out
Production operation, the pitch-based sphere well make the reservoir region of another part form the second heating tape；
Step S3: described to add after thermal communication is established with second heating tape in first heating tape after the second preset time
Add horizontal well for persistently injecting steam to the reservoir region, until terminating to reservoir region oil recovery, wherein the horizontal well
Keep continuous production mode.
2. the method according to claim 1, wherein
The thickness of the oil reservoir is greater than or equal to 8m；
The porosity of the oil reservoir is greater than 0.2；
The horizontal permeability of the oil reservoir is greater than 500mD；
The ratio of the vertical permeability of the oil reservoir and the horizontal permeability is greater than 0.5；
The oil saturation of the oil reservoir is greater than 0.5；
Oil reservoir oil viscosity at 50 DEG C is less than 50000mPa.s.
3. the method according to claim 1, wherein the throughput level well is multiple, multiple water of handling up
Horizontal well is opened in the bottom section of the oil reservoir, and the distance between two neighboring described throughput level well is L, wherein 60m≤L
≤100m。
4. the method according to claim 1, wherein in the step S2 further include:
After the first preset time, when the recovery ratio of the throughput level well is greater than or equal to 20%, water of handling up described in closing
Horizontal well is when the pressure depth pressure and hydrostatic pressure corresponding with the oil reservoir of the oil reservoir is equal, in the throughput level well
Oblique upper opens up the pitch-based sphere well.
5. the method according to claim 1, wherein the pitch-based sphere well is followed using heat in the step S2
Ring oil production method injects steam to the reservoir region using long tube by the pitch-based sphere well, using short tube to the oil reservoir
The oil reservoir in area recovers the oil, wherein
The mass dryness fraction of the steam of the long tube injection is greater than 60%；
The speed of the steam of the long tube injection is v1, wherein 60t/d≤v1≤1000t/d；
The pressure of the steam of the long tube injection is P1, and the formation fracture pressure of the reservoir region is P2, wherein P1≤10%
P2 or P1≤15%P2；
The production-injection ratio of the reservoir region is t1, wherein 0.8≤t1≤1.
6. the method according to claim 1, wherein the pitch-based sphere well is used and is gulped down in the step S2
The method for spitting oil recovery, wherein
It is greater than 60% by the mass dryness fraction that the pitch-based sphere well injects the steam of reservoir region；
The speed of the steam of the pitch-based sphere well injection reservoir region is v2, wherein 200t/d≤v2≤300t/d；
The gas injection intensity of the steam of the pitch-based sphere well injection reservoir region is Q, wherein 8t/m≤Q≤20t/m；
The pressure of the steam of the pitch-based sphere well injection reservoir region is less than the formation fracture pressure of the reservoir region；
The production-injection ratio of the reservoir region is t2, wherein 0.7≤t2≤1.2.
7. the method according to claim 1, wherein after second preset time, the throughput level well
Viscosity of crude between the pitch-based sphere well is less than or equal to 100mPa.s.
8. the method according to claim 1, wherein in the step S3,
It is greater than 60% by the mass dryness fraction that the pitch-based sphere well injects the steam of reservoir region；
The speed of the steam of the pitch-based sphere well injection reservoir region is v3, wherein 50t/d≤v3≤70t/d；
The maximum gas injection pressure that reservoir region is injected by the pitch-based sphere well is P3, and the formation fracture pressure of the reservoir region is
P4, wherein P3≤15%P4 or P3≤20%P4.
9. the method according to claim 1, wherein in the step S3, the pressure of the pitch-based sphere well with
The absolute value of the difference of the pressure of the throughput level well is less than 0.5MPa.
10. the method according to claim 1, wherein the throughput level well extraction goes out in the step S3
The ratio that liquid measure and the pitch-based sphere well and the throughput level well inject the quantity of steam of the reservoir region is q, wherein 1≤q≤
1.2。
11. the method according to claim 1, wherein the pitch-based sphere well spacing is hung down from the throughput level well
Upward displacement is L1, and the displacement of horizontal direction of the pitch-based sphere well spacing from the throughput level well is L2, wherein 3m≤
L1≤5m, 6m≤L2≤15m.
12. the method according to claim 1, wherein the pitch-based sphere well is parallel with the throughput level well
Ground setting, the length of the horizontal segment of the pitch-based sphere well is identical as the length of horizontal segment of the throughput level well, alternatively, institute
State the length of the horizontal segment of pitch-based sphere well with it is the length of the horizontal segment of two to three throughput level wells and identical.
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