CN106468163A - Vertical well for steam flooding oil production and heavy oil production method - Google Patents
Vertical well for steam flooding oil production and heavy oil production method Download PDFInfo
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- CN106468163A CN106468163A CN201510521007.2A CN201510521007A CN106468163A CN 106468163 A CN106468163 A CN 106468163A CN 201510521007 A CN201510521007 A CN 201510521007A CN 106468163 A CN106468163 A CN 106468163A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 98
- 238000010795 Steam Flooding Methods 0.000 title claims abstract description 61
- 239000003921 oil Substances 0.000 title description 399
- 239000000295 fuel oil Substances 0.000 title description 3
- 238000011084 recovery Methods 0.000 claims abstract description 47
- 239000003129 oil well Substances 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 34
- 239000007924 injection Substances 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 31
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 44
- 238000010793 Steam injection (oil industry) Methods 0.000 claims description 39
- 229910052757 nitrogen Inorganic materials 0.000 claims description 22
- 239000008246 gaseous mixture Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 7
- 238000000605 extraction Methods 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 20
- 230000035699 permeability Effects 0.000 description 16
- 239000010779 crude oil Substances 0.000 description 15
- 238000010796 Steam-assisted gravity drainage Methods 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 6
- 238000005086 pumping Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000010410 layer Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004513 sizing Methods 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 206010002961 Aplasia Diseases 0.000 description 2
- 238000010794 Cyclic Steam Stimulation Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- ZQPPMHVWECSIRJ-KTKRTIGZSA-N oleic acid group Chemical group C(CCCCCCC\C=C/CCCCCCCC)(=O)O ZQPPMHVWECSIRJ-KTKRTIGZSA-N 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
The invention provides a vertical well for steam flooding oil extraction and a method for extracting thick oil. Wherein, a vertical well for steam flooding oil recovery includes: the first oil pipe is arranged in the oil layer, and the bottom end of the first oil pipe is higher than the central position of the oil layer; the second oil pipe is arranged in the oil layer, and the bottom end of the second oil pipe is lower than the central position of the oil layer; the packer is sleeved on the outer side of the second oil pipe and is positioned between the bottom end of the second oil pipe and the bottom end of the first oil pipe; and the oil well casing is sleeved outside the first oil pipe, the second oil pipe and the packer and is provided with a perforation well section positioned in an oil layer. The vertical well realizes effective exploitation of an oil layer in the oil extraction process of steam huff-puff to steam flooding oil extraction; and a well pattern structure in the prior art is abandoned, the same-well injection and production and gravity drainage in a steam flooding oil extraction mode are realized by only utilizing a single straight well, the number of deployed wells is reduced, the cost is reduced, and the economic benefit of the steam flooding oil extraction mode is improved.
Description
Technical field
The present invention relates to technical field of petroleum extraction, in particular to opening of a kind of straight well for steam drive oil production and viscous crude
Mining method.
Background technology
Steam soak is conventional thick oil thermal recovery method, and its basic process is first to inject a certain amount of steam, one section of closing well to oil well
Time, after the heat energy of steam is to oil reservoir diffusion, then opening well and making production.The process of steam soak operation can be divided into three phases, that is,
Steam injection, stewing well and back production.Its basic increasing yield has heating, viscosity reducing, the release of oil reservoir elastic energy, gravity drive and makees after heating
With absorbing waste heat in, exploitation process, the compaction on stratum, oil layer unblocking effect, the driving effect of steam expansion, solvent are taken out
Propose effect, the effect improving oleic permeability, pre- heat effect, effect of increased drawdown etc..In general, cyclic steam stimulation
Belong to dependence natural energy exploitation, simply after being artificially injected some steam heated oil reservoir, create a series of strengthenings and adopt
Oil machine is managed, the main or effect of crude oil heating viscosity-reducing.The super thick of 20,000 centipoises is more than for degassed crude viscosity under the conditions of 50 DEG C
For oil, it is very limited to employ radius, typically employs radius and is only capable of reaching 15-20m, and recovery percent of reserves is less than 20%, and the initial stage passs
Lapse rate reaches 20%-30%, and after production 6-7 round of handling up, effect is drastically deteriorated.
In order to improve the general effect of heat extraction by steam injection and the recovery ratio of oil, need to turn cyclic steam stimulation to opportune moment
Enter steam driving exploitation, two kinds of steam drive oil production modes commonly used in the prior art be respectively using dual horizontal well carry out oil exploitation and
Combination using straight well-horizontal well carries out oil exploitation, cardinal principle be by steam assist heating in crude oil reduce viscosity, then according to
By action of gravity draining, and continuously produce crude oil in producing well, its operating type belongs to the integration of operation of many wells, steam injection
The special steam injection of well, producing well specially produces.But for the high super-heavy oil deposit of viscosity of crude, above two mode pair
The seriality requirement of oil reservoir is higher, typically requires horizontal section length to be more than 400m, oil reservoir is longitudinally continuous more than thickness 10m can
Realize economical and effective.
Content of the invention
Present invention is primarily targeted at providing the recovery method of a kind of straight well for steam drive oil production and viscous crude, to realize steaming
Vapour is handled up the effective exploitation to viscous crude in the oil recovery process turn steam drive oil production.
To achieve these goals, according to an aspect of the invention, it is provided a kind of straight well for steam drive oil production, including：
First oil pipe, is arranged in oil reservoir, and the bottom of the first oil pipe is higher than the center of oil reservoir；Second oil pipe, is arranged at oil reservoir
In, and the bottom of the second oil pipe is less than the center of oil reservoir；Packer, is set in the outside of the second oil pipe, and packer position
Between the bottom and the bottom of the first oil pipe of the second oil pipe；Oil well casing, is set in the first oil pipe, the second oil pipe and packer
Outside, and oil well casing has the perforated interval in oil reservoir.
Further, perforated interval is located at the side near the first oil pipe.
Further, perforated interval includes the first perforated interval and the second perforated interval, and the first perforated interval is higher than the center of oil reservoir,
Second perforated interval is less than the center of oil reservoir.
Further, the spacing of the first perforated interval and the second perforated interval is 1～2m.
Further, the length ratio that the length that the first oil pipe is located in oil reservoir is located in oil reservoir with the second oil pipe is 2～4.
Further, in oil reservoir, the spacing of the first oil pipe and the second oil pipe is 15～20mm.
Further, straight well also includes temperature measuring set and the pressure transducer being arranged in the second oil pipe.
Further, the average thickness of oil reservoir is more than 7m.
Further, the distance apart from ground for the upper surface of oil reservoir is 150m～800m.
According to a further aspect in the invention, there is provided a kind of recovery method of viscous crude, comprise the following steps：S1, set in oil reservoir
Put oil well casing；S2, the first oil pipe and the second oil pipe are sent in oil well casing；S3, adopt steam oil production mode, lead to
Cross the first oil pipe and the second oil pipe injection steam, to exploit to oil reservoir；S4, by packer send into oil well casing in, make envelope
It is set in the outside of the second oil pipe every device, and packer is located between bottom and the bottom of the first oil pipe of the second oil pipe, sets envelope
Every device, make packer that oil well casing is separated into two regions；S5, steam oil production mode is switched to steam drive oil production mode,
By steam is injected to the first oil pipe, using the second oil pipe, oil reservoir is exploited.
Further, step S1 also includes：Perforation is carried out to oil well casing, to form the perforated interval being located in oil reservoir.
Further, perforated interval is located at the side near the first oil pipe, and perforated interval includes the first perforated interval and the second perforated interval,
First perforated interval is higher than the center of oil reservoir, and the second perforated interval is less than the center of oil reservoir.
Further, step S2 also includes：Temperature measuring set and pressure transducer are sent in the second oil pipe.
Further, in step s3,3～5 wheel exploitations are carried out using steam oil production mode to oil reservoir, often take turns the week of exploitation
Phase is 60～250 days, and gap periods are 70～265 days.
Further, in steam oil production mode, bottom-hole steam quality is not less than 0.7, and wheel steam injection amount is 1000～3000 tons,
Steam injection rate is 80～250 ton day, and the stewing well time is 3～5 days.
Further, the spacing of the first perforated interval and the second perforated interval is 1～2m, in step s 4, packer is sent into oil well
In sleeve pipe, packer is made to be located in the oil well casing between the first perforated interval and the second perforated interval.
Further, in steam drive oil production mode, steam injection rate is 80～250 ton day, and production-injection ratio is more than 1.2.
Further, step S5 also includes：Oil reservoir is exploited to the scheduled time using steam drive oil production mode, to first
Oil pipe nitrogen injection and the gaseous mixture of steam, the nitrogen of injection and the volume ratio of steam are 0.2～0.5, when the injection rate of nitrogen reaches
After 0.15PV, stop to the first oil pipe nitrogen injection.
Application technical scheme, the invention provides a kind of straight well for steam drive oil production, because above-mentioned straight well includes
Its bottom is less than the second oil pipe of oil reservoir center and is arranged at the second oil higher than the first oil pipe of oil reservoir center, its bottom
Packer between the bottom of the bottom of pipe and the first oil pipe, thus the first oil can not only be applied in steam oil production mode
Pipe and the second oil pipe carry out steam injection and recover the oil additionally it is possible to after steam soak turns steam drive oil production mode, application packer is in straight well
Middle formation vapor chamber, and carry out steam injection using the first oil pipe, the second oil pipe is recovered the oil, and then achieves and turn steaming in steam soak
Vapour drives the effective exploitation in the oil recovery process recovering the oil to oil reservoir；And, because above-mentioned first oil pipe and above-mentioned second oil pipe are respectively provided with
Such that it is able to abandon well pattern structure of the prior art in a straight well, achieve steam drive oil production mode merely with single straight well
In single-well injection-production and gravity drainage, and then greatly reduce well deployment quantity, reduce cost, improve steam drive oil production
The economic benefit of mode.
Brief description
The Figure of description constituting the part of the application is used for providing a further understanding of the present invention, the schematic reality of the present invention
Apply example and its illustrate, for explaining the present invention, not constituting inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 shows the schematic diagram of the straight well being applied to steam drive oil production mode that embodiment of the present invention is provided；
Fig. 2 shows the schematic diagram of the straight well being applied to steam oil production mode that embodiment of the present invention is provided；And
Fig. 3 shows that the exploitation after switching to steam drive oil production mode in the recovery method of the viscous crude that embodiment of the present invention is provided is shown
It is intended to.
Specific embodiment
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can be mutually combined.
To describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
It should be noted that term used herein above is merely to describe specific embodiment, and it is not intended to restricted root according to this Shen
Illustrative embodiments please.As used herein, unless the context clearly indicates otherwise, otherwise singulative is also intended to
Including plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " inclusion ",
It indicates existing characteristics, step, operation, device, assembly and/or combinations thereof.
For the ease of description, space relative terms can be used here, such as " ... on ", " ... top ", " ...
Upper surface ", " above " etc., for describing as the space of a device shown in the figure or feature and other devices or feature
Position relationship.It should be appreciated that space relative terms are intended to comprise making in addition to the orientation described by device is in figure
With or operation in different azimuth.For example, if the device in accompanying drawing is squeezed, it is described as " on other devices or construction
Side " or " other devices or construction on " device after will be positioned as " other devices or construction below " or "
Under other devices or construction ".Thus, exemplary term " ... top " can include " ... top " and " ...
Two kinds of lower section " orientation.This device can also position (ratating 90 degrees or be in other orientation) by other different modes, and to this
In the description relatively of the space that used make respective explanations.
From background technology, two kinds of steam drive oil production modes commonly used in the prior art are to carry out oil using dual horizontal well respectively
Exploit and oil exploitation is carried out using the combination of straight well-horizontal well, but for the high super-heavy oil deposit of viscosity of crude, on
The seriality requirement stating two ways to oil reservoir is higher.The present inventor is studied for the problems referred to above, there is provided a kind of
For the straight well of steam drive oil production, as shown in figure 1, including：First oil pipe 10, is arranged in oil reservoir 60, and described first oil
The bottom of pipe 10 is higher than the center of described oil reservoir 60；Second oil pipe 20, is arranged in described oil reservoir 60, and described second
The bottom of oil pipe 20 is less than the center of described oil reservoir 60；Packer 30, is set in the outside of described second oil pipe 20, and
Described packer 30 is located between bottom and the bottom of described first oil pipe 10 of described second oil pipe 20；Oil well casing 40, set
It is located at the outside of described first oil pipe 10, described second oil pipe 20 and described packer 30, and described oil well casing 40 has position
Perforated interval 50 in described oil reservoir 60.
The above-mentioned straight well for steam drive oil production is less than higher than the first oil pipe of oil reservoir center, its bottom due to including its bottom
Second oil pipe of oil reservoir center and the packer being arranged between the bottom of the second oil pipe and the bottom of the first oil pipe, thus not
Only can apply the first oil pipe in steam oil production mode and the second oil pipe carries out steam injection and recovers the oil additionally it is possible in steam soak
After turning steam drive oil production mode, application packer forms vapor chamber in straight well, and carries out steam injection, the second oil using the first oil pipe
Pipe is recovered the oil, and then achieves and turn the effective exploitation to oil reservoir in the oil recovery process of steam drive oil production in steam soak；And,
Because above-mentioned first oil pipe and above-mentioned second oil pipe may be contained within a straight well such that it is able to abandon well pattern knot of the prior art
Structure, achieves single-well injection-production and the gravity drainage in steam drive oil production mode merely with single straight well, and then greatly reduces well deployment
Quantity, reduce cost, improve the economic benefit of steam drive oil production mode.
It is preferable that described perforated interval 50 is located near described first in the straight well provided by the present invention for steam drive oil production
The side of oil pipe 10.In steam drive oil production mode, using above-mentioned preferred embodiment can be by using the first oil pipe 10
More effectively injecting steam in oil reservoir 60, thus being more beneficial for the heating to oil reservoir 60 for the steam, and then improve in oil reservoir 60
Crude oil production efficiency.And, the steam drive oil production mode in the present invention includes SAGD oil production method, SAGD is that steam is auxiliary
Help gravity drainage.
It is preferable that described perforated interval 50 includes the first perforated interval 510 in the straight well provided by the present invention for steam drive oil production
With the second perforated interval 520, described first perforated interval 510 is higher than the center of described oil reservoir 60, described second perforated interval 520
Center less than described oil reservoir 60.The above-mentioned mode that is preferable to provide more reasonably can utilize perforated interval, makes perforated interval 50
It has been effectively shielded from the position that packer 30 is arranged on oil well casing 40, thus it is improper (such as to efficiently avoid perforation fragment position
Positioned at oil reservoir 60 center) cause ground perforation operation waste.
Above-mentioned preferred embodiment in, the spacing of described first perforated interval 510 and described second perforated interval 520 is 1～2m.
Using above-mentioned preferred parameter area, packer 30 can be made to be effectively shielded from the position of perforated interval 50, thus avoiding envelope
Every the closure to perforated interval 50 for the device 30, perforated interval 50 is enable more effectively to carry out steam injection to oil reservoir 60.
It is preferable that described first oil pipe 10 is located at described oil reservoir 60 in the straight well provided by the present invention for steam drive oil production
In the length ratio that is located in described oil reservoir 60 with described second oil pipe 20 of length be 2～4.It is further preferable that in described oil reservoir
First oil pipe 10 described in 60 is 15～20mm with the spacing of described second oil pipe 20.Can using above-mentioned preferred parameter area
The first oil pipe 10 being arranged in straight well and the second oil pipe 20 is made more effectively to carry out steam injection and oil recovery, thus improve first
Oil pipe 10 and the oil recovery efficiency of the second oil pipe 20.
It is preferable that described straight well also includes being arranged at described second oil in the straight well provided by the present invention for steam drive oil production
Temperature measuring set in pipe 20 and pressure transducer.Said temperature measuring instrument due to being arranged in the second oil pipe 20 such that it is able to
Effectively the ambient temperature in the second oil pipe 20 is tested；And, because pressure transducer is due in the second oil pipe 20,
So as to effectively test to the ambient pressure in the second oil pipe 20, and then more enough ambient temperatures by recording and environment
Pressure carries out monitor in real time to the environmental condition in straight well, thus carrying out real-time monitoring to the process conditions in oil recovery process.Wherein,
Said temperature measuring instrument can be thermocouple, and above-mentioned pressure transducer can be capillary tube.
Preferably, the straight well for steam drive oil production of the application is used for the exploitation of oil deposit of shallow-layer super heavy, wherein, oil reservoir 60
Average thickness is more than 7m, and the upper surface of oil reservoir 60 distance apart from ground is 150m～800m, the porosity of described oil reservoir 60
More than 0.2, horizontal permeability is more than 300md, and vertical permeability is more than 0.3 with the ratio of horizontal permeability, and remaining oil saturation is big
In 0.50.
According to a further aspect in the invention, there is provided a kind of recovery method of viscous crude, comprise the following steps：S1, in oil reservoir 60
Setting oil well casing 40；S2, described first oil pipe 10 and described second oil pipe 20 are sent in described oil well casing 40；S3、
Using steam oil production mode, steam is injected by described first oil pipe 10 and described second oil pipe 20, with to described oil reservoir
60 are exploited；S4, packer 30 is sent in described oil well casing 40, make described packer 30 be set in described second oil
The outside of pipe 20, and described packer 30 is located between the bottom of described second oil pipe 20 and the bottom of described first oil pipe 10,
Set described packer 30, make described packer 30 that described oil well casing 40 is separated into two regions；S5, by described steam
Huff and puff oil recovery mode switchs to steam drive oil production mode, by injecting steam to described first oil pipe 10, using described second oil pipe 20
Described oil reservoir 60 is exploited.
Because the bottom of the first oil pipe is higher than oil reservoir center in above-mentioned recovery method, the bottom of the second oil pipe is less than oil reservoir center
Position, and packer is arranged between the bottom of the second oil pipe and the bottom of the first oil pipe, thus can not only be in steam soak
The first oil pipe and the second oil pipe is applied to carry out steam injection and recover the oil additionally it is possible to turn steam drive oil production mode in steam soak in oil production method
Afterwards, application packer forms vapor chamber in straight well, and carries out steam injection using the first oil pipe, and the second oil pipe is recovered the oil, and then
Achieve and turn the effective exploitation to oil reservoir in the oil recovery process of steam drive oil production in steam soak；And, due to above-mentioned first oil pipe
May be contained within such that it is able to abandon well pattern structure of the prior art in a straight well with above-mentioned second oil pipe, merely with single straight well
Achieve the single-well injection-production in steam drive oil production mode and gravity drainage, and then greatly reduce the quantity that well is disposed, reduce into
This, improve the economic benefit of steam drive oil production mode.
A kind of straight well for steam oil production of present invention offer is provided, including：First oil pipe 10, is arranged at
In oil reservoir 60, and the bottom of described first oil pipe 10 is higher than the center of described oil reservoir 60；Second oil pipe 20, is arranged at institute
State in oil reservoir 60, and the bottom of described second oil pipe 20 is less than the center of described oil reservoir 60；Oil well casing 40, is set in
The outside of described first oil pipe 10, described second oil pipe 20 and described packer 30, and described oil well casing 40 has positioned at institute
State the perforated interval 50 in oil reservoir 60.
The exemplary embodiment party of the recovery method of the viscous crude providing according to the present invention is provided below in conjunction with Fig. 1 and Fig. 2
Formula.However, these illustrative embodiments can be implemented by many different forms, and should not be construed to be limited solely to
Embodiments set forth herein.It should be appreciated that these embodiments are provided so that disclosure herein thoroughly and
Completely, and by the design of these illustrative embodiments it is fully conveyed to those of ordinary skill in the art.
First, execution step S1：Oil well casing 40 is set in oil reservoir 60.In above-mentioned steps, carry out being suitable for oil reservoir scalping
Choosing, selected oil reservoir 60 buried depth is shallower than 800m, oil reservoir 60 thickness>7m, oil reservoir 60 porosity>0.2, horizontal permeability>300md,
Vertical permeability and horizontal permeability ratio>0.3, remaining oil saturation>0.50, the continuous mud stone of aplasia, shale in oil reservoir 60
Interlayer.
In a preferred embodiment, described step S1 also includes：Perforation is carried out to described oil well casing 40, to be formed
Perforated interval 50 in described oil reservoir 60.It is further preferable that described perforated interval 50 is located near described first oil pipe 10
Side, described perforated interval 50 includes the first perforated interval 510 and the second perforated interval 520, and described first perforated interval 510 is higher than
The center of described oil reservoir 60, and described second perforated interval 520 is less than the center of described oil reservoir 60.Above-mentioned preferred
Embodiment can make the perforated interval 50 of formation be effectively shielded from the position that packer 30 is arranged on oil well casing 40, thus
Efficiently avoid the waste that perforation fragment position improper (as positioned at oil reservoir 60 center) causes ground perforation operation.
After completing step S1, execution step S2：Described first oil pipe 10 and described second oil pipe 20 are sent into described oil well
In sleeve pipe 40.Preferably, the length that described first oil pipe 10 is located in described oil reservoir 60 and described second oil pipe 20 are located at institute
Stating the length ratio in oil reservoir 60 is 2～4.It is further preferable that first oil pipe 10 and described second described in described oil reservoir 60
The spacing of oil pipe 20 is 15～20mm.The first oil pipe 10 that can make to be arranged in straight well using above-mentioned preferred parameter area with
Second oil pipe 20 more effectively carries out steam injection and oil recovery, thus improve the first oil pipe 10 and the oil recovery efficiency of the second oil pipe 20,
And then improve the tar productivity of final crude oil.
In a preferred embodiment, described step S2 also includes：Temperature measuring set and pressure transducer are sent into described the
In two oil pipes 20.Sending can be effectively to the ambient temperature in the second oil pipe 20 in the said temperature measuring instrument in the second oil pipe 20
Tested；And, sending can be effectively to the ambient pressure in the second oil pipe 20 in the pressure transducer in the second oil pipe 20
Tested, and then more enough ambient temperatures by recording and ambient pressure are carried out monitor in real time to the environmental condition in straight well, from
And real-time monitoring is carried out to the process conditions in oil recovery process.Wherein, said temperature measuring instrument can be thermocouple, above-mentioned pressure
Sensor can be capillary tube.
After completing step S2, execution step S3：Using steam oil production mode, by described first oil pipe 10 and institute
State the second oil pipe 20 injection steam, to exploit to described oil reservoir 60.In the oil production method of steam soak, first,
One oil pipe 10 and the second oil pipe 20 are used to inject steam, closing well for a period of time, after the heat energy of steam is to oil reservoir 60 diffusion,
Drive a well again and recovered the oil using the first oil pipe 10 and the second oil pipe 20.Due to above-mentioned first oil pipe 10 and above-mentioned second oil pipe 20
May be contained within a straight well such that it is able to abandon well pattern structure of the prior art, achieve steam soak merely with single straight well
Oil production method, and then greatly reduce the quantity of well deployment, reduce cost, improve the economic effect of steam oil production mode
Benefit.
In a preferred embodiment, in described step S3, using described steam oil production mode to described oil reservoir 60
Carry out 3～5 wheel exploitations, the cycle often taking turns exploitation is 60～250, and gap periods are 70～265.Above-mentioned preferred parameter area can
Play the effect of preheating oil reservoir 60, a certain amount of crude oil can be produced using steam soak initial stage higher rate of oil production simultaneously, carry
The high tar productivity of final crude oil.
In a preferred embodiment, in described steam oil production mode, bottom-hole steam quality is not less than 0.7, alternate water injection
Vapour amount is 1000～3000 tons, and steam injection rate is 80～250 ton day, and the stewing well time is 3～5 days.Using above-mentioned preferred parameter
Scope can be in steam oil production mode, and the above-mentioned straight well that be directed to the application provides realizes the effective exploitation to crude oil, from
And improve the tar productivity of final crude oil.
After completing step S3, execution step S4：Packer 30 is sent in described oil well casing 40, makes described packer
30 outsides being set in described second oil pipe 20, and described packer 30 is located at the bottom and described first of described second oil pipe 20
Between the bottom of oil pipe 10, set described packer 30, make described packer 30 that described oil well casing 40 is separated into Liang Ge area
Domain.In above-mentioned steps, packer 30 is made to set by heating power or pressure effect, thus oil reservoir 60 in steam drive oil production mode
In can form a SAGD vapor chamber, and then carry out steam injection using the first oil pipe 10, the second oil pipe 20 carries out recovering the oil and realizes
Effective exploitation of steam drive oil production mode Crude Oil.
In a preferred embodiment, the spacing of described first perforated interval 510 and described second perforated interval 520 is 1～2m,
In described step S4, described packer 30 is sent in described oil well casing 40, make described packer 30 be located at described the
In described oil well casing 40 between one perforated interval 510 and described second perforated interval 520.Above-mentioned preferred embodiment can make
Packer 30 is effectively shielded from the position of perforated interval 50, thus avoiding the closure to perforated interval 50 for the packer 30, makes
Perforated interval 50 more effectively can carry out steam injection to oil reservoir 60 in steam drive oil production mode.
After completing step S4, execution step S5：Described steam oil production mode is switched to steam drive oil production mode, by right
Described first oil pipe 10 injects steam, using described second oil pipe 20, described oil reservoir 60 is exploited.In above-mentioned steps,
First oil pipe 10 is only used for injecting steam, and the second oil pipe 20 is only used for oil reservoir 60 is exploited, due to above-mentioned first oil pipe 10
May be contained within such that it is able to abandon well pattern structure of the prior art in a straight well with above-mentioned second oil pipe 20, merely with Dan Zhi
Well achieves steam drive oil production mode, and then greatly reduces the quantity that well is disposed, and reduces cost, improves steam drive oil production
The economic benefit of mode；And, switch to steam drive oil production mode (SAGD) to be operated, directly terminate the steam soak stage
Oil yield successively decrease, enter the stable yields stage, by gravity drainage effect, at a relatively high oil recovery factor can be reached, finally adopt
Yield improves 10%～25% than steam soak, reaches more than 20%～45%.
The exploitation schematic diagram after steam drive oil production mode is switched to as shown in figure 3, passing through in the recovery method of viscous crude that the application provides
First oil pipe 10 injects steam, and packer 30 forms SAGD vapor chamber after setting in oil reservoir 60, and vapor chamber one side is ordered about
Non- condensate gas diffuses to oil reservoir top, is on the other hand carried out deep fat from the second oil pipe 20 that oil reservoir tail band enters straight well using condensed liquid
Recover the oil；And, it can be seen that the steam zone that SAGD vapor chamber is formed is much larger than in steam oil production mode and steams
The scope of the affected area of handling up that vapour is formed, thus can be realized to oil reservoir Crude Oil in the later stage of recovering the oil using steam drive oil production mode
Effective exploitation, and then improve the recovery ratio of oil reservoir Crude Oil.
In a preferred embodiment, in described steam drive oil production mode, steam injection rate is 80～250 ton day, production-injection ratio
More than 1.2.The above-mentioned straight well of the application offer in steam drive oil production mode, can be provided using above-mentioned preferred parameter area
Realize the effective exploitation to crude oil, thus improve the tar productivity of final crude oil.
In a preferred embodiment, described step S5 also includes：Using described steam drive oil production mode to described oil reservoir 60
Exploited to the scheduled time, to the gaseous mixture of described first oil pipe 10 nitrogen injection and steam, the nitrogen of injection and steam
Volume ratio is 0.2～0.5, after the injection rate of nitrogen reaches 0.15PV, stops to described first oil pipe 10 nitrogen injection.Preferably
Ground, the above-mentioned scheduled time is 1～3 year.After producing the scheduled time, nitrogen injection assists, existing maintenance steam chamber pressure, further
Increasing the effect of steam swept volume and uniformity, nitrogen being realized heat-insulated in the covering of oil reservoir 60 top, thus reducing heat waste again
Lose, increase the thermal efficiency.
The straight well for steam drive oil production of the application offer and the recovery method of viscous crude are be provided below in conjunction with embodiment.
Embodiment 1
The present embodiment provides a kind of recovery method of viscous crude：
(1) oil reservoir coarse sizing, selected oil reservoir buried depth 300m are carried out, core intersection is 8m, oil reservoir porosity is 0.25, level
Permeability is 800md, and vertical permeability and horizontal permeability ratio are 0.7, and remaining oil saturation is 0.68, aplasia in oil reservoir
Continuous mud stone, intercalated shale, under the conditions of 50 DEG C, degassed crude viscosity is 30,000 centipoises.
(2) in single port straight well arrange oil well casing, and into oil well casing under enter the first oil pipe and the second oil pipe, under the first oil pipe
Enter oil reservoir middle and upper part, under the second oil pipe, enter oil reservoir bottom, enter thermocouple at present together and capillary tube measures temperature and pressure near pumping hole
Power.
(2) in oil layer section segmenting perforating before steam soak produces, reserved 2m region not perforation in the middle part of oil reservoir, using Double-pipe gas-injection
With produce 3 rounds, wheel steam injection amount is 3000 tons, and steam injection rate is 250 ton day, and the stewing well time is 3 days.
(3) the 3rd wheel productions terminate after under enter packer, under enter in the middle part of the reserved area in the middle part of oil reservoir of position.
The continuous steam injection of (4) first oil pipes, the second oil pipe continuously produces, and wherein, steam injection rate is 250 ton day, and production-injection ratio is
1.2, pumping hole position Sub-Cool remains between 5-15 DEG C；And, under the thermodynamic activity of steam, packer clamping oil
Casing and the second oil pipe.
(5) the first oil pipe nitrogen injection and steam fluid after producing 2 years, subsurface volume ratio for 0.5, total injection of nitrogen
Amount stops after reaching 0.15PV to note, and during the first oil pipe nitrogen injection and steam fluid, the second oil pipe continues continuous production, production-injection ratio
For 1.2.
(6) continue the second oil pipe steam injection, steam injection rate is 250 ton day, production-injection ratio is 1.2, and pumping hole position Sub-Cool begins
It is maintained at eventually between 5-15 DEG C, until produce terminating.
Embodiment 2
The present embodiment provides a kind of recovery method of viscous crude：
(1) oil reservoir coarse sizing, selected oil reservoir buried depth 450m are carried out, core intersection is 15m, oil reservoir porosity is 0.28, water
Flat permeability is 1500md, and vertical permeability and horizontal permeability ratio are 0.8, and remaining oil saturation is 0.70, in oil reservoir not
Develop continuous mud stone, intercalated shale, under the conditions of 50 DEG C, degassed crude viscosity is 40,000 centipoises.
(2) in single port straight well arrange oil well casing, and in oil well casing under enter the first oil pipe and the second oil pipe, under the first oil pipe
Enter oil reservoir middle and upper part, under the second oil pipe, enter oil reservoir bottom, enter thermocouple at present together and capillary tube measures temperature and pressure near pumping hole
Power.
(2) in oil layer section segmenting perforating before steam soak produces, reserved 2m region not perforation in the middle part of oil reservoir, using Double-pipe gas-injection
With produce 5 rounds, wheel steam injection amount is 2000 tons, and steam injection rate is 100 ton day, and the stewing well time is 3 days.
(3) the 5th wheel productions terminate after under enter packer, under enter in the middle part of the reserved area in the middle part of oil reservoir of position.
The continuous steam injection of (4) first oil pipes, the second oil pipe continuously produces, and wherein, steam injection rate is 100 ton day, and production-injection ratio is
1.2, pumping hole position Sub-Cool remains between 5-20 DEG C；And, under the thermodynamic activity of steam, packer clamping oil
Casing and the second oil pipe.
(5) the first oil pipe nitrogen injection and steam fluid after producing 2 years, subsurface volume ratio for 0.5, total injection of nitrogen
Amount stops after reaching 0.15PV to note, and during the first oil pipe nitrogen injection and steam fluid, long tube continues continuous production, and production-injection ratio is
1.2.
(6) continue short tube steam injection, steam injection rate is 150 ton day, production-injection ratio is 1.2, and pumping hole position Sub-Cool protects all the time
Hold between 5-20 DEG C, until produce terminating.
Comparative example 1
This comparative example provides a kind of recovery method of viscous crude：
(1) oil reservoir coarse sizing, selected oil reservoir buried depth 450m are carried out, core intersection is 15m, oil reservoir porosity is 0.28, water
Flat permeability is 1500md, and vertical permeability and horizontal permeability ratio are 0.8, and remaining oil saturation is 0.70, in oil reservoir not
Develop continuous mud stone, intercalated shale, under the conditions of 50 DEG C, degassed crude viscosity is 20,000 centipoises.
(2) in single port straight well, oil well casing is set, and in oil well casing under enter an oil pipe, adopt dual-purpose pump with entering note at present.
(3) in oil layer section perforation before steam soak produces, 1/4 not perforation, steam injection and production of core intersection is reserved in top of oil horizon
8 rounds, take turns 2000 tons of steam injection amount, steam injection rate 100 ton day, stewing 3 days well time, until produce terminating.
Above-described embodiment 1 to 2 is tested with the recovery ratio of comparative example 1 and gas oil ratio, test result is as shown in the table：
| Recovery ratio, % | Gas oil ratio, f | |
| Embodiment 1 | 35 | 0.18 |
| Embodiment 2 | 38 | 0.25 |
| Comparative example 1 | 18 | 0.13 |
As can be seen from the above table, the recovery method of viscous crude in embodiment 1, compared with conventional steam huff and puff oil recovery mode, harvests
Rate improves 17%, and gas oil ratio improves 0.05；Compared with conventional steam huff and puff oil recovery mode, recovery ratio improves 20% to embodiment 2,
Gas oil ratio improves 0.12.
As can be seen from the above description, the above embodiments of the present invention achieve following technique effect：
(1) take turns initially with steam soak 3～5, the effect of preheating oil reservoir can be played, the steam soak initial stage can be utilized simultaneously
Higher rate of oil production produces a certain amount of crude oil；
(2) steam oil production mode switchs to steam drive oil production mode and is operated, and directly terminates the oil product in steam soak stage
Amount is successively decreased, and enters the stable yields stage, by gravity drainage effect, can reach at a relatively high oil recovery factor, ultimate recovery can
Improve 10%～25% than steam soak, reach more than 20%～45%；
(3) produce the scheduled time after nitrogen injection auxiliary, existing maintenance steam chamber pressure, further increase steam swept volume and
The effect of uniformity, can realize again nitrogen top of oil horizon cover heat-insulated, thus reducing heat loss, increase the thermal efficiency；
(4) present invention abandons the oil production method of many wells integration of operation in prior art, carries out steam oil production only with single straight well
Steam injection in mode and steam drive oil production mode and oil recovery it is achieved that the single-well injection-production in steam drive oil production mode and gravity drainage,
Thus greatly reducing the quantity of well deployment, reducing cost, improve the economic benefit of steam drive oil production mode.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art
For, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made, etc.
With replacing, improving etc., should be included within the scope of the present invention.
Claims (18)
1. a kind of straight well for steam drive oil production is it is characterised in that include：
First oil pipe (10), is arranged in oil reservoir (60), and the bottom of described first oil pipe (10) is higher than described oil reservoir
(60) center；
Second oil pipe (20), is arranged in described oil reservoir (60), and the bottom of described second oil pipe (20) is less than described
The center of oil reservoir (60)；
Packer (30), is set in the outside of described second oil pipe (20), and described packer (30) is located at described the
Between the bottom of the bottom of two oil pipes (20) and described first oil pipe (10)；
Oil well casing (40), is set in described first oil pipe (10), described second oil pipe (20) and described packer (30)
Outside, and described oil well casing (40) has the perforated interval (50) in described oil reservoir (60).
2. straight well according to claim 1 is it is characterised in that described perforated interval (50) is located near described first oil pipe
(10) side.
3. straight well according to claim 1 is it is characterised in that described perforated interval (50) includes the first perforated interval (510)
With the second perforated interval (520), described first perforated interval (510) is higher than the center of described oil reservoir (60), and described the
Two perforated intervals (520) are less than the center of described oil reservoir (60).
4. straight well according to claim 3 is it is characterised in that described first perforated interval (510) and described second perforated interval (520)
Spacing be 1～2m.
5. straight well according to claim 1 is it is characterised in that described first oil pipe (10) is located in described oil reservoir (60)
The length ratio that is located in described oil reservoir (60) of length and described second oil pipe (20) be 2～4.
6. straight well according to claim 5 it is characterised in that the first oil pipe (10) described in described oil reservoir (60) with
The spacing of described second oil pipe (20) is 15～20mm.
7. straight well according to claim 1 is it is characterised in that described straight well also includes being arranged at described second oil pipe (20)
In temperature measuring set and pressure transducer.
8. straight well according to claim 1 is it is characterised in that the average thickness of described oil reservoir (60) is more than 7m.
9. straight well according to claim 1 is it is characterised in that the distance apart from ground for the upper surface of described oil reservoir (60) is
150m～800m.
10. a kind of recovery method of viscous crude is it is characterised in that comprise the following steps：
S1, setting oil well casing (40) in oil reservoir (60)；
S2, the first oil pipe (10) and the second oil pipe (20) are sent in described oil well casing (40)；
S3, adopt steam oil production mode, injected by described first oil pipe (10) and described second oil pipe (20)
Steam, to exploit to described oil reservoir (60)；
S4, packer (30) is sent in described oil well casing (40), so that described packer (30) is set in described
The outside of the second oil pipe (20), and described packer (30) is located at the bottom and described the of described second oil pipe (20)
Between the bottom of one oil pipe (10), set described packer (30), make described packer (30) by described oil well casing
(40) it is separated into two regions；
S5, described steam oil production mode is switched to steam drive oil production mode, by noting to described first oil pipe (10)
Enter steam, using described second oil pipe (20), described oil reservoir (60) is exploited.
11. recovery methods according to claim 10 are it is characterised in that described step S1 also includes：
Perforation is carried out to described oil well casing (40), to form the perforated interval (50) being located in described oil reservoir (60).
12. recovery methods according to claim 11 are it is characterised in that described perforated interval (50) is located near described first
The side of oil pipe (10), described perforated interval (50) includes the first perforated interval (510) and the second perforated interval (520),
Described first perforated interval (510) is higher than the center of described oil reservoir (60), and described second perforated interval (520) is low
Center in described oil reservoir (60).
13. recovery methods according to claim 10 are it is characterised in that described step S2 also includes：
Temperature measuring set and pressure transducer are sent in described second oil pipe (20).
14. recovery methods according to claim 10 it is characterised in that in described step S3, using described steam soak
Oil production method carries out 3～5 wheel exploitations to described oil reservoir (60), and the cycle often taking turns exploitation is 60～250 days, and gap periods are
70～265 days.
15. recovery methods according to claim 10 it is characterised in that in described steam oil production mode, shaft bottom steam
Mass dryness fraction is not less than 0.7, and wheel steam injection amount is 1000～3000 tons, and steam injection rate is 80～250 ton day, and the stewing well time is 3～5
My god.
16. recovery methods according to claim 12 are it is characterised in that described first perforated interval (510) and described second is penetrated
The spacing of hole section (520) is 1～2m, in described step S4, described packer (30) is sent into described oil well casing
(40), in, described packer (30) is made to be located at described first perforated interval (510) and described second perforated interval (520)
Between described oil well casing (40) in.
17. recovery methods according to claim 10 are it is characterised in that in described steam drive oil production mode, steam injection rate is
80～250 ton day, production-injection ratio is more than 1.2.
18. recovery methods according to claim 17 are it is characterised in that described step S5 also includes：
Using described steam drive oil production mode, described oil reservoir (60) was exploited to the scheduled time, to the described first oil
Pipe (10) nitrogen injection and the gaseous mixture of steam, the nitrogen of injection and the volume ratio of steam are 0.2～0.5, when the note of nitrogen
Enter after amount reaches 0.15PV, stop to described first oil pipe (10) nitrogen injection.
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| CN113863908A (en) * | 2021-05-10 | 2021-12-31 | 中国石油大学(华东) | Method for improving steam injection uniformity of SAGD horizontal well |
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