CN105863591A - Preheating method and preheating well for fireflooding assisted gravity drainage - Google Patents
Preheating method and preheating well for fireflooding assisted gravity drainage Download PDFInfo
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- CN105863591A CN105863591A CN201610329255.1A CN201610329255A CN105863591A CN 105863591 A CN105863591 A CN 105863591A CN 201610329255 A CN201610329255 A CN 201610329255A CN 105863591 A CN105863591 A CN 105863591A
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- 230000005484 gravity Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract 2
- 239000003129 oil well Substances 0.000 claims description 30
- 238000010438 heat treatment Methods 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 18
- 239000007924 injection Substances 0.000 claims description 18
- 238000007789 sealing Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 85
- 239000000203 mixture Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 8
- 238000010793 Steam injection (oil industry) Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000012925 reference material Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000012360 testing method Methods 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2406—Steam assisted gravity drainage [SAGD]
-
- 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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Abstract
The application provides a preheating method and a preheating well for fireflooding assisted gravity drainage, wherein the preheating method comprises the following steps: and acquiring the target oil reservoir and the oil layer thickness of the oil reservoir. And perforating the first vertical well and the second vertical well in the oil layer according to the thickness of the oil layer. And then performing steam throughout within a preset time, wherein the steam throughout the first vertical well, the second vertical well and the horizontal well in the oil reservoir so as to enable the first vertical well, the horizontal well and the second vertical well to establish preliminary thermal communication. After the first straight well, the horizontal well and the second straight well are communicated thermally, continuously injecting steam into the first straight well; and discharging liquid to the horizontal well and the second vertical well until the temperature among the first vertical well, the horizontal well and the second vertical well reaches a preset temperature, and finishing preheating. The preheating method and the preheating well can form an ideal oil drainage cavity which is approximately cylindrical in the preheating stage, so that the fire wire is far away from the shaft of the horizontal well, and the failure of fire flooding thickened oil caused by the fact that the fire wire breaks through the horizontal well can be avoided.
Description
Technical field
The application belongs to technical field of petroleum extraction, is specifically related to the pre-of a kind of fireflood assisted gravity drainage
By the use of thermal means and pre-hot well.
Background technology
Fireflood assisted gravity drainage is generally on the basis of conventional straight well fireflood technology, by introducing level
Producing well, utilizes gravity drainage effect to realize fireflood exploitation viscous crude.In fireflood assisted gravity drainage process
In, the stage of oil reservoir preheating is most important.Oil reservoir pre-heat effect is good, and the exploitation effect of fireflood viscous crude is
Can be more preferably.
But up to now, the circulation preheating of fireflood assisted gravity drainage the most commonly used horizontal production well,
The preheating method of gas injection straight well steam soak preheating, sees shown in accompanying drawing 1.This preheating method is laid particular stress on
Form thermal communication between injection-production well, between injection-production well, define the linear drain path of relatively narrower, see
Shown in accompanying drawing 2 and accompanying drawing 3.Enter after the fireflood stage, live wire first based on this passage the most progressively
Extension, easily causes live wire and extends near wellbore, and advance along pit shaft, and live wire spreading range is little, enters
And be easily caused live wire and spread to horizontal well, ultimately causing horizontal well burns out, it is impossible to recover the oil.
Summary of the invention
In order to overcome the drawbacks described above of prior art, the technical problem to be solved is to provide one
Plant the pre-heating mean of fireflood assisted gravity drainage and pre-hot well, drain path can be widened, and make live wire
Away from horizontal well pit shaft, deduction and exemption live wire spreads to horizontal well.
The concrete technical scheme of the present invention is:
The present invention provides the pre-heating mean of a kind of fireflood assisted gravity drainage, comprises the steps:
Obtain target reservoir, and the core intersection of described target reservoir；
According to described core intersection, the first straight well in described oil reservoir and the second straight well are carried out perforation；
After perforation completes, in the given time, to described first straight well, described second straight well, with
And the horizontal well in described oil reservoir carries out steam soak preheating, so that described first straight well, described water
Horizontal well and described second straight well set up preliminary thermal communication；
After described first straight well, described horizontal well and described second straight well thermal communication, to institute
It is continuously injected into steam in stating the first straight well, described horizontal well and described second straight well are carried out discharge opeing；
When between the well of described first straight well, described horizontal well and described second straight well, temperature reaches pre-
If during temperature, stop injecting steam in described first straight well, and stop described horizontal well and institute
State the second straight well and carry out discharge opeing.
In one embodiment, while being continuously injected into steam in described first straight well, according to
The horizontal segment of described horizontal well and the variations in temperature of described second straight well determine the size of preheating cavity.
In one embodiment, the horizontal segment of described horizontal well is positioned at the end circle of described oil reservoir；Described
First straight well is positioned at described horizontal well away from one end of well head and the top that is arranged on described horizontal well；Institute
State the second straight well and be arranged in the both sides of described horizontal well along the horizontal segment of described horizontal well.
In one embodiment, the oil saturation of described target reservoir is more than 0.35；Porosity is big
In 0.20；Permeability is more than 500md；Viscosity of crude is more than 50000mPa s.
In one embodiment, the perforation of described first straight well and described second straight well is positioned at described oil
At the 1/3 of layer top.
In one embodiment, described first straight well, described second straight well and described horizontal well
The speed carrying out steam soak preheating time institute's steam injection is identical.
In one embodiment, when steam soak preheats, the injection rate of steam is 150～200t/d；
The described scheduled time is 15～20 days.
In one embodiment, when steam soak preheats, described first straight well, described second straight
The lifting rate of well and described horizontal well is 10t/d.
In one embodiment, at described first straight well, described horizontal well and described second straight
After well thermal communication, the speed being continuously injected into steam in described first straight well is 100t/d, injection length
For 45d.
In one embodiment, described preset temperature is 110～120 DEG C.
It addition, the application also provides for the pre-hot well of a kind of fireflood assisted gravity drainage, it includes:
The horizontal well being arranged in oil reservoir, the horizontal segment of described horizontal well is positioned at the end circle of described oil reservoir；
First straight well, described first straight well is positioned at described horizontal well and away from one end of well head and is arranged on institute
State the top of horizontal well；
At least one pair of second straight well, described second straight well is arranged in described along the horizontal segment of described horizontal well
The both sides of horizontal well.
In one embodiment, described horizontal well is sieve tube completion, described first straight well and described
Two straight wells are perforation completion, and wherein perforation is positioned at the 1/3 of described oil reservoir top.
In one embodiment, described horizontal well at steam soak warm-up phase, including: be located in
The vertical section of described horizontal well and the first tubing string of horizontal segment, and it is arranged on the vertical section of described horizontal well
Lifting tubing string；
Described first tubing string includes: be located in the vertical section of described horizontal well and at least part of horizontal segment
First instlated tubular, described first instlated tubular connects the first screen casing away from one end of well head；Described first every
Being arranged with the first oil pipe in heat pipe and described first screen casing, described first oil pipe is away from described well head
One end is connected with the second screen casing and sealing member in turn；
Described lifting tubing string includes: be arranged on the second oil pipe of the vertical section of described horizontal well, described second
Connect below oil pipe and have oil well pump, be equipped with, in described second oil pipe, the oil pumping being connected with described oil well pump
Bar, is connected with the 3rd screen casing, tail pipe and sealing member in turn below described oil well pump.
In one embodiment, the length of described first screen casing accounts for described horizontal well horizontal segment
1/3-1/2。
In one embodiment, described horizontal well is at blowdown period, including lifting tubing string, described
Lifting tubing string includes: be arranged on the second oil pipe of the vertical section of described horizontal well, below described second oil pipe
Connect and have oil well pump, in described second oil pipe, be equipped with the sucker rod being connected with described oil well pump, described
The 3rd screen casing, tail pipe and sealing member it is connected with in turn below oil well pump.
In one embodiment, described first straight well and described second straight well in the steam soak stage,
Including: note adopts a tubing string, and described note is adopted tubing string and is connected with the in turn from well head to direction, shaft bottom
Three oil pipes, note adopt integrated pump, the 4th screen casing, tail pipe and sealing member.
In one embodiment, described first straight well is at blowdown period, including gas injection tube column, institute
State gas injection tube column and include the second instlated tubular and the horn mouth being connected with described second instlated tubular, described
Horn mouth is arranged in described oil reservoir, is provided with packer in the oil jacket annular space of described first straight well, described
Packer is arranged on described bell-mouthed top.
In one embodiment, described second straight well is at blowdown period, including lifting tubing string, institute
State lifting tubing string to include: be arranged on the second oil pipe of the vertical section of described horizontal well, under described second oil pipe
Side connects oil well pump, is equipped with the sucker rod being connected with described oil well pump, institute in described second oil pipe
State and below oil well pump, be connected with the 3rd screen casing, tail pipe and sealing member in turn.
In one embodiment, the horizontal section length of described horizontal well is 200～350 meters.
In one embodiment, the distance between described second straight well and described horizontal well is 20 meters,
Distance between adjacent described second straight well is 50～60 meters.
By above technical scheme, the application has the beneficial effects that: the present invention is by pre-timing
In, the first straight well, the second straight well and horizontal well are carried out steam soak preheating, to set up oil
Preliminary thermal communication between well.Then it is further continued for the first straight well is continuously injected into steam；Horizontal well, with
And second straight well carry out discharge opeing, until temperature reaches pre-between the first straight well, horizontal well and the second straight well well
If temperature, warm-up phase terminates.Can be formed at warm-up phase and approximate columned ideal letting out
Oil cavity, make live wire away from horizontal well pit shaft, and then can avoid live wire break through horizontal well cause fireflood
Viscous crude failure.Established solid foundation for the optimum extension of live wire of fireflood stage simultaneously.
With reference to explanation hereinafter and accompanying drawing, disclose in detail the particular implementation of the application, specify
The principle of the application can be in adopted mode.It should be understood that presently filed embodiment is in scope
It is not so limited.In the range of the spirit and terms of claims, the reality of the application
The mode of executing includes many changes, revises and be equal to.
The feature described for a kind of embodiment and/or illustrate can be in same or similar mode one
Individual or more other embodiment uses, combined with the feature in other embodiment, or replace
For the feature in other embodiment.
It should be emphasized that term " includes/comprises " referring to when using feature, one integral piece, step or group herein
The existence of part, but it is not precluded from the existence of one or more further feature, one integral piece, step or assembly
Or it is additional.
Accompanying drawing explanation
Accompanying drawing described here is only used for task of explanation, and is not intended to limit by any way the application
Scope of disclosure.It addition, the shape of each parts in figure and proportional sizes etc. are only schematically, use
In helping the understanding to the application, it is not shape and the proportional sizes specifically limiting each parts of the application.
Those skilled in the art, under teachings of the present application, can select various possible as the case may be
Shape and proportional sizes implement the application.In the accompanying drawings:
Fig. 1 is the schematic diagram of oil well preheating after heat connected state in prior art；
Fig. 2 is the design sketch after oil well of the prior art preheating；
Fig. 3 be use prior art pre-heating mean after live wire involve view；
Fig. 4 is the schematic diagram of the oil well preheating after heat connected state of the application embodiment；
Fig. 5 is that after using the pre-heating mean in presently filed embodiment, live wire involves view；
Fig. 6 is the horizontal well tubular column structure schematic diagram at steam soak warm-up phase of the application；
Fig. 7 is first straight well tubular column structure schematic diagram at steam soak warm-up phase of the application；
Fig. 8 is second straight well tubular column structure schematic diagram at steam soak warm-up phase of the application；
Fig. 9 is the horizontal well tubular column structure schematic diagram at blowdown period of the application；
Figure 10 is first straight well tubular column structure schematic diagram at blowdown period of the application；
Figure 11 is second straight well tubular column structure schematic diagram at blowdown period of the application.
The reference of the figures above is expressed as: 1, horizontal well；2, the first straight well；3, the second straight well；
4, the first tubing string；41, the first instlated tubular；42, the first screen casing；43, the first oil pipe；44, second
Screen casing；5, lifting tubing string；51, the second oil pipe；52, oil well pump；53, the 3rd screen casing；6, close
Sealing；7, tail pipe；8, note adopts a tubing string；81, the 3rd oil pipe；82, note adopts integrated pump；83、
4th screen casing；9, gas injection tube column；91, the second instlated tubular；92, horn mouth；93, packer.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the application embodiment, to the technical side in the application embodiment
Case is clearly and completely described, it is clear that described embodiment is only the application part
Embodiment rather than whole embodiments.Based on the embodiment in the application, this area is general
The every other embodiment that logical technical staff is obtained under not making creative work premise, all
Belong to the scope of the application protection.
It should be noted that when element is referred to as " being arranged at " another element, and it can directly exist
On another element or element placed in the middle can also be there is.When an element is considered as " connection "
Another element, it can be directly to another element or may be simultaneously present centering elements.
Term as used herein " vertical ", " level ", "left", "right" and similar statement are only
The purpose illustrated that, being not offered as is unique embodiment.
Unless otherwise defined, all of technology used herein and scientific terminology with belong to the application's
The implication that those skilled in the art are generally understood that is identical.Institute in the description of the present application herein
The term used is intended merely to describe the purpose of specific embodiment, it is not intended that in limiting the application.
Term as used herein "and/or" include the arbitrary of one or more relevant Listed Items and
All of combination.
The present invention provides the pre-heating mean of a kind of fireflood assisted gravity drainage, comprises the steps:
S1: obtain target reservoir, and the core intersection of described target reservoir；
S2: according to described core intersection, the first straight well 2 in described oil reservoir and the second straight well 3 are entered
Row perforation；
S3: after perforation completes, in the given time, to described first straight well 2, described second straight well
3 and described oil reservoir in horizontal well 1 carry out steam soak preheating so that described first straight well 2,
Described horizontal well 1 and described second straight well 3 set up preliminary thermal communication；
S4: described first straight well 2, described horizontal well 1 and described second straight well 3 thermal communication it
After, in described first straight well 2, it is continuously injected into steam, to described horizontal well 1 and described second straight
Well 3 carries out discharge opeing；
S5: temperature when between the well of described first straight well 2, described horizontal well 1 and described second straight well 3
When degree reaches preset temperature, stop injecting steam in described first straight well 2, and stop described water
Horizontal well 1 and described second straight well 3 carry out discharge opeing.
In the present embodiment, the horizontal segment of described horizontal well 1 is positioned at the end circle of described oil reservoir, described
The vertical section of horizontal well 1 passes stratum.Described first straight well 2 is arranged in the end of described horizontal well 1
(away from one end of horizontal well 1 well head) and above described horizontal well 1.For the ease of viscous crude quilt
Fireflood is caught up with and is flow to horizontal well 1, and usual first straight well 2 is positioned at above horizontal well 1, generally arranges
It is about about at the 2/3 of core intersection.Described second straight well 3 arranges along the horizontal segment of described horizontal well 1
Both sides at described horizontal well 1.The quantity of the second straight well 3 can be one group, two groups or more
Group, those skilled in the art can carry out appropriate design according to the length of horizontal well 1 horizontal segment.Citing
For, the second straight well 3 of described horizontal well 1 homonymy can apart from described horizontal well 1 about 20 meters,
Spacing between adjacent second straight well 3 of horizontal well 1 homonymy can be 50～60 meters.
For the ease of fireflood heavy crude producing, target reservoir generally can select the oil-containing of oil reservoir in oil reservoir to satisfy
With degree more than 0.35；The porosity of oil reservoir is more than 0.20；The permeability of oil reservoir is more than 500md；Crude oil
The viscosity oil reservoir more than 50000mPa s.After target reservoir acquisition is complete, determine target reservoir
Core intersection.
According to described core intersection, the first straight well 2 in described oil reservoir and the second straight well 3 are penetrated
Hole.Generally for the oil reservoir of different core intersections, perforating site is slightly different.But consider oil
Reservoir parameter in Ceng, typically requires that the perforation of described first straight well 2 and described second straight well 3 is positioned at
At the 1/3 of described oil reservoir top.So recovery ratio when can ensure that later stage heavy crude producing is set relatively
High.Of course, this is not intended to be limited in any by the present invention, and those skilled in the art can be according to different oil
The concrete condition hidden optimizes design further.
After perforation completes, in the given time, to described first straight well 2, described second straight well 3,
And the horizontal well 1 in oil reservoir carries out steam soak preheating, so that described first straight well 2, described water
Horizontal well 1 and described second straight well 3 set up thermal communication.The generally design parameter of steam injection in oil well
It is referred to conventional steam handle up and rationally arrange.But because this stage main purpose is so that first is straight
Preliminary thermal communication is set up between well 2, horizontal well 1 and the second straight well 3, it is therefore proposed that the first straight well 2,
The steam injection rate of horizontal well 1 and the second straight well 3 is the most identical.Specifically, the injection speed of steam
Degree can be 150～200t/d；The scheduled time required for steam injection can be 15～20 days.
After steam injects oil well, it is also possible to carry out stewing well, make the heat of steam gradually spread in oil well.
The most stewing well time can be 5～10 days, keeps well head steam quality > 75%.Meanwhile, in the mistake of steam injection
Journey strictly to control fluid production rate, described first straight well 2, described second straight well 3 and described water
The lifting rate of horizontal well 1 typically 10t/d.
After described first straight well 2, described horizontal well 1 and described second straight well 3 thermal communication, still
Described first straight well 2 is continuously injected into steam.Due to the steam soak stage the first straight well 2,
Thermal communication is tentatively established between horizontal well 1 and the second straight well 3.Therefore, for preventing the first straight well
Occurring vapour to alter between 2 and horizontal well 1, the injection rate at this stage the first straight well 2 can not be excessive.Logical
Often for reaching ideal effect, it can be 100t/d that the first straight well 2 injects the speed of steam, injection
Time can be about 45 days.Of course, those skilled in the art can be for different Oil Reservoir Types
And the practical situation of oil property the most reasonably optimizes design, this is not appointed by the application
What limits.
Warm-up phase at oil reservoir, it usually needs set up effective gas diffusion space in oil reservoir.This
Sample can make oil reservoir preheating complete, and after entering fireflood mining phase, initial live wire is at the base of preheating cavity
Extension is continued on plinth.If preheating cavity is less, then the first straight well 2 and horizontal well 1, horizontal well 1 and the
Effective thermal communication will not be formed between two straight wells 3.And the crude oil between oil reservoir does not have mobility, no
Horizontal well 1 can be flowed into because of action of gravity, i.e. not set up the migration pathway of crude oil, so can cause effect of recovering the oil
The poorest.If preheating cavity is excessive, then in the fire flood stage, live wire can burn horizontal well 1, or heat
Air enters horizontal well 1, and fireflood can be caused to proceed.Therefore based on requirements above, generally want
In the first straight well 2 while steam injection, also will be according to the shaft bottom (level of horizontal well of horizontal well 1
Section) and the change of the second straight well temperature determine the size of preheating cavity.
Generally preheating cavity size can be determined jointly by numerical simulation and field monitoring data.In preheating
Need synchronization to set up numerical reservoir model during beginning, and carry out oil reservoir data and on-the-spot test synchronized update.
At the scene a number of observation well can be set in the range of well group simultaneously, and periodic detection down-hole is constantly
The data such as temperature, pressure, the oil content field followed the tracks of in conjunction with reservoir numerical simulation, pressure field and saturated
Field figure and the various curves such as degree field, comprehensively determine the size of preheating cavity.
Meanwhile, described horizontal well 1 and described second straight well 3 to be carried out discharge opeing.When described second
When straight well 3 meets following condition simultaneously, preheating terminates.Specifically, when described first straight well 2, institute
When stating that between the well of horizontal well 1 and described second straight well 3, temperature reaches preset temperature, namely reach
When 110～120 DEG C, the warm of oil reservoir all terminates.Now, the first straight well 2 in oil reservoir, water
Horizontal well 1 and the second straight well 3 have been set up preferable thermal communication.
The pre-heating mean of the fireflood assisted gravity drainage of the present invention, as shown in figures 4 and 5,
Steam soak warm-up phase, the heated perimeter of oil reservoir is similar to a cylinder centered by all oil wells
Body.And then the columned preferable draining cavity of approximation can be formed at steam soak warm-up phase.It addition,
The perforating site of the first straight well 2 and the second straight well 3 is respectively positioned at the 1/3 of oil reservoir top, horizontal well 1
It is normally at the end circle (bottom) of oil reservoir.After using this kind of preheating method preheating, similar funnel can be formed
The cavity of shape.But the bottom of cavity and horizontal well 1 still have certain longitudinal thickness.Generally at this thickness
In the range of crude oil there is certain mobility, but oil saturation is apparently higher than inside cavity.Therefore
The live wire in fireflood stage is affected because laterally being pulled effect by gas onlap effect and the second straight well, meeting
Based on cavity after preheating, the most upwards and to direction, both sides expand.And with shape edge, obtuse angle
Horizontal well direction pushes away well, make live wire away from horizontal well pit shaft, and then can avoid live wire break through horizontal well
Cause the failure of fireflood viscous crude.Established solid foundation for the optimum extension of live wire of fireflood stage simultaneously.
It addition, the present invention also provides for the pre-hot well of a kind of fireflood assisted gravity drainage, it includes: level
Well the 1, first straight well 2 and the second straight well 3.Horizontal well 1 is arranged in oil reservoir, described horizontal well
The horizontal segment of 1 is positioned at the end circle of described oil reservoir.Described first straight well 2 is positioned at described horizontal well 1 away from well
Mouthful one end and be arranged on the top of described horizontal well 1.At least one pair of second straight well 3 is along described level
The horizontal segment of well 1 is arranged in the both sides of described horizontal well 1.The horizontal section length of described horizontal well 1 is
Can be 200～350 meters.
In a specific embodiment, described horizontal well 1 is sieve tube completion, described first straight well 2
It is perforation completion with described second straight well 3.In order to the pre-heat effect making pre-hot well is good, wherein perforation can
To be positioned at the 1/3 of described oil reservoir top.
When carrying out steam soak preheating, the first tubing string 4 generally can be equipped with in horizontal well 1.First
Tubing string 4 is generally arranged at vertical section and the horizontal segment of horizontal well 1.First tubing string 4 can be to horizontal well 1
Interior injection steam.Meanwhile, lifting tubing string 5, lift tube can be also provided with in the described vertical section of horizontal well 1
Post 5 can be used to lift fluid.
Specifically, refer to the first tubing string 4 described in accompanying drawing 6 include: be located in described horizontal well 1
Vertically section and the first instlated tubular 41 of at least part of horizontal segment.First instlated tubular 41 is away from the one of well head
End connects the first screen casing 42.It is arranged with in described first instlated tubular 41 and described first screen casing 42
One oil pipe 43, described first oil pipe 43 is connected with the second screen casing 44 in turn away from one end of described well head
And sealing member 6, wherein sealing member 6 is preferably plug.First instlated tubular 41 can be used to isolate well
Heat in Tong, it is to avoid burn out the first oil pipe 43 within the first instlated tubular 41.Steam can be by the
First instlated tubular 41 of one tubing string 4 and the first oil pipe 43 inject, then by the first screen casing 42 He
Second screen casing 44 is injected in oil reservoir.Wherein, the length of described first screen casing 42 accounts for described level
The 1/3-1/2 of well 1 horizontal segment.So arrange and the steam that heat is high, mass dryness fraction is high can be made to be first poured into
The posterior segment of oil reservoir.As for the leading portion of oil reservoir, then can be by the suction force effect of later stage oil well pump 52
The heat driving oil reservoir posterior segment spreads to the leading portion of oil reservoir, and then the leading portion of heating oil reservoir, so may be used
To improve the injection efficiency of steam, strengthen the utilization rate of steam.
Described lifting tubing string 5 includes the second oil pipe 51 being arranged on the described vertical section of horizontal well 1, described
Connect below second oil pipe 51 and have oil well pump 52, be equipped with and described oil pumping in described second oil pipe 51
The sucker rod (not shown) that pump 52 connects, is connected with the 3rd screen casing in turn below described oil well pump
53, tail pipe 7 and sealing member 6.After steam injects, in order to ensure that steam-energy more preferably heats oil reservoir,
After generally can carrying out the stewing well a few days, recycling lifting tubing string 5 carries out lifting discharge opeing.
Meanwhile, at steam soak warm-up phase, as shown in accompanying drawing 7 and accompanying drawing 8, described first straight well 2
All including that note adopts a tubing string 8 with described second straight well 3, described note adopts tubing string 8 from well head to well
Direction, the end be connected with in turn the 3rd oil pipe 81, note adopt integrated pump the 82, the 4th screen casing 83, tail pipe 7, with
And sealing member 6, wherein sealing member 6 is preferably plug.First straight well 2 and the second straight well 3 use note to adopt
One time tubing string 8 can be carried out the stewing well a few days after injecting steam in oil reservoir, and recycling note is adopted once
Pump 82 carries out discharge opeing, need not change the tubing string in oil well.
At blowdown period, described first straight well 2, described horizontal well 1 and described second straight well 3 exist
After carrying out steam soak thermal communication, described first straight well 2 can be continuously injected into steam, to described water
Horizontal well 1 and described second straight well 3 carry out discharge opeing production.Refer to accompanying drawing 9, at this moment, horizontal well
Owing to only carrying out discharge opeing production in 1, therefore can only retain lifting tubing string 5 and carry out discharge opeing and produce.
Now, the structure of lifting tubing string 5 no longer can repeat at this with described previously.In like manner, please
Seeing accompanying drawing 11, the second straight well 3 is owing to the most only need to carry out producing discharge opeing, therefore, this stage also only
Tubing string 5 need to be lifted.
Refer to accompanying drawing 10, owing to the first straight well 2 persistently to inject steam at blowdown period, therefore,
To enter down gas injection tube column 9 in blowdown period the first straight well 2, described gas injection tube column 9 includes that second is heat insulation
Pipe 91 and the horn mouth 92 being connected with described second instlated tubular 91.Second instlated tubular 91 can be every
The heat of oil reservoir, prevents gas injection tube column 9 from being burnt out by high temperature absolutely.Described horn mouth 92 is arranged on described oil
So that oil reservoir is carried out steam injection in Ceng.It is provided with packer 93 in the oil jacket annular space of described first straight well 2,
Described packer 93 is arranged on the top of described horn mouth 92.
It should be noted that the first straight well 2, horizontal well 1 and aerofluxus 3 well that the present embodiment provides
All can select the existing structure of any appropriate.By being clearly briefly described the skill that the present embodiment is provided
Art scheme, will no longer repeat above-mentioned part at this, and Figure of description has been also carried out corresponding simplification.
However, it should be understood that the most therefore the present embodiment is restricted in scope.
Herein cited any digital value all includes between lower limit to higher limit with an incremented
Lower value and all values of upper value, between any lower value and any much higher value, there is at least two unit
Interval.For example, if elaborating quantity or process variable (the such as temperature of parts
Degree, pressure, time etc.) value be from 1 to 90, preferably from 20 to 80, more preferably from 30 to 70,
Such as 15 to 85,22 to 68,43 are listed the most clearly during then purpose illustrates that this description
Equivalent to 51,30 to 32.For the value less than 1, suitably think unit be 0.0001,
0.001、0.01、0.1.These only want the example clearly expressed, it is believed that at minimum and
Likely combining of the numerical value enumerated between peak is all in a similar manner in this description clearly
Elaborate.
Except as otherwise noted, all scopes all include all numerals between end points and end points.With model
Enclose " about " or " approximation " being used together and be suitable for two end points of this scope.Thus, " about
20 to 30 " it is intended to cover " about 20 to about 30 ", at least includes the end points indicated.
The all articles disclosed and reference material, including patent application and publication, for various purposes
It is hereby incorporated by by quoting.Describe combination term " substantially by ... constitute " should include determined by
Element, composition, parts or step and essentially without its of basic novel feature affecting this combination
His element, composition, parts or step.Use term " to comprise " or " including " describes here
The combination of element, composition, parts or step it is also contemplated that substantially by these elements, composition, parts or
The embodiment that step is constituted.Here by use term " can ", it is intended to illustrate that " permissible " includes
Described any attribute be all optional.
Multiple elements, composition, parts or step can be by single integrated component, composition, parts or steps
Suddenly provide.Alternatively, single integrated component, composition, parts or step can be divided into separation
Multiple elements, composition, parts or step.It is used for describing the disclosure of element, composition, parts or step
"a" or "an" is not said to get rid of other element, composition, parts or step.
It should be understood that above description is to illustrate rather than to limit.Pass through
Read foregoing description, the many embodiments outside the example provided and many application to this area
All will be apparent from for technical staff.Therefore, the scope of this teaching should not retouched with reference to above-mentioned
State and determine, but the equivalent should being had with reference to aforementioned claim and these claim
Four corner determine.Patent application and public affairs are included for comprehensive purpose, all articles and reference
The disclosure accused all is passed through with reference to being incorporated herein.Master disclosed herein is omitted in aforementioned claim
Any aspect of topic is not intended to abandon this body matter, also should not be considered as applicant and should not
Theme is thought of as a part for disclosed application theme.
Claims (20)
1. the pre-heating mean of a fireflood assisted gravity drainage, it is characterised in that comprise the steps:
Obtain target reservoir, and the core intersection of described target reservoir；
According to described core intersection, the first straight well in described oil reservoir and the second straight well are carried out perforation；
After perforation completes, in the given time, to described first straight well, described second straight well, with
And the horizontal well in described oil reservoir carries out steam soak preheating, so that described first straight well, described water
Horizontal well and described second straight well set up preliminary thermal communication；
After described first straight well, described horizontal well and described second straight well thermal communication, to institute
It is continuously injected into steam in stating the first straight well, described horizontal well and described second straight well are carried out discharge opeing；
When between the well of described first straight well, described horizontal well and described second straight well, temperature reaches pre-
If during temperature, stop injecting steam in described first straight well, and stop described horizontal well and institute
State the second straight well and carry out discharge opeing.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
While being continuously injected into steam in described first straight well, according to the horizontal segment of described horizontal well and
The variations in temperature of described second straight well determines the size of preheating cavity.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
The horizontal segment of described horizontal well is positioned at the end circle of described oil reservoir；Described first straight well is positioned at described horizontal well
Away from one end of well head and be arranged on the top of described horizontal well；Described second straight well is along described horizontal well
Horizontal segment be arranged in the both sides of described horizontal well.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
The oil saturation of described target reservoir is more than 0.35；Porosity is more than 0.20；Permeability is more than 500md；
Viscosity of crude is more than 50000mPa s.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
The perforation of described first straight well and described second straight well is positioned at the 1/3 of described oil reservoir top.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
Described first straight well, described second straight well and described horizontal well carry out being noted during steam soak preheating
The speed of steam is identical.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 6, it is characterised in that
When steam soak preheats, the injection rate of steam is 150～200t/d；The described scheduled time is 15～20
My god.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 6, it is characterised in that
When steam soak preheats, described first straight well, described second straight well and the row of described horizontal well
Liquid measure is 10t/d.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, it is characterised in that
After described first straight well, described horizontal well and described second straight well thermal communication, to described
The speed being continuously injected into steam in one straight well is 100t/d, and injection length is 45d.
The pre-heating mean of fireflood assisted gravity drainage the most according to claim 1, its feature exists
In, described preset temperature is 110～120 DEG C.
The pre-hot well of 11. 1 kinds of fireflood assisted gravity drainages, it is characterised in that it includes:
The horizontal well being arranged in oil reservoir, the horizontal segment of described horizontal well is positioned at the end circle of described oil reservoir；
First straight well, described first straight well is positioned at described horizontal well and away from one end of well head and is arranged on institute
State the top of horizontal well；
At least one pair of second straight well, described second straight well is arranged in described along the horizontal segment of described horizontal well
The both sides of horizontal well.
The pre-hot well of 12. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described horizontal well is sieve tube completion, and described first straight well and described second straight well are perforation completion, wherein
Perforation is positioned at the 1/3 of described oil reservoir top.
The pre-hot well of 13. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described horizontal well at steam soak warm-up phase, including: be located in the vertical section of described horizontal well and level
First tubing string of section, and it is arranged on the lifting tubing string of the vertical section of described horizontal well；
Described first tubing string includes: be located in the vertical section of described horizontal well and at least part of horizontal segment
First instlated tubular, described first instlated tubular connects the first screen casing away from one end of well head；Described first every
Being arranged with the first oil pipe in heat pipe and described first screen casing, described first oil pipe is away from described well head
One end is connected with the second screen casing and sealing member in turn；
Described lifting tubing string includes: be arranged on the second oil pipe of the vertical section of described horizontal well, described second
Connect below oil pipe and have oil well pump, be equipped with, in described second oil pipe, the oil pumping being connected with described oil well pump
Bar, is connected with the 3rd screen casing, tail pipe and sealing member in turn below described oil well pump.
The pre-hot well of 14. fireflood assisted gravity drainages according to claim 13, it is characterised in that
The length of described first screen casing accounts for the 1/3-1/2 of described horizontal well horizontal segment.
The pre-hot well of 15. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described horizontal well at blowdown period, including: lifting tubing string, described lifting tubing string includes: be arranged on institute
Stating the second oil pipe of the vertical section of horizontal well, connecting below described second oil pipe has oil well pump, and described second
It is equipped with the sucker rod being connected with described oil well pump in oil pipe, below described oil well pump, is connected with in turn
Three screen casings, tail pipe and sealing member.
The pre-hot well of 16. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described first straight well and described second straight well in the steam soak stage, including: note adopt a tubing string, institute
State note adopt that tubing string is connected with the 3rd oil pipe in turn from well head to direction, shaft bottom, note adopts integrated pump, the
Four screen casings, tail pipe and sealing member.
The pre-hot well of 17. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described first straight well at blowdown period, including: gas injection tube column, described gas injection tube column includes that second is heat insulation
Pipe and the horn mouth being connected with described second instlated tubular, described horn mouth is arranged in described oil reservoir,
Being provided with packer in the oil jacket annular space of described first straight well, described packer is arranged on described bell-mouthed
Top.
The pre-hot well of 18. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Described second straight well at blowdown period, including: lifting tubing string, described lifting tubing string includes: be arranged on
Second oil pipe of the vertical section of described horizontal well, connects below described second oil pipe and has an oil well pump, and described the
It is equipped with the sucker rod being connected with described oil well pump in two oil pipes, is connected with in turn below described oil well pump
3rd screen casing, tail pipe and sealing member.
The pre-hot well of 19. fireflood assisted gravity drainages according to claim 11, it is characterised in that
The horizontal section length of described horizontal well is 200～350 meters.
The pre-hot well of 20. fireflood assisted gravity drainages according to claim 11, it is characterised in that
Distance between described second straight well and described horizontal well is 20 meters, between adjacent described second straight well
Distance is 50～60 meters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610329255.1A CN105863591A (en) | 2016-05-18 | 2016-05-18 | Preheating method and preheating well for fireflooding assisted gravity drainage |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610329255.1A CN105863591A (en) | 2016-05-18 | 2016-05-18 | Preheating method and preheating well for fireflooding assisted gravity drainage |
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| CN107514250A (en) * | 2016-06-15 | 2017-12-26 | 中国石油化工股份有限公司 | A kind of method for SAGD |
| CN110847872A (en) * | 2019-11-25 | 2020-02-28 | 西南石油大学 | An experimental device for studying the effect of interlayer on SAGD production in double horizontal wells |
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| CA2783439A1 (en) * | 2012-07-20 | 2014-01-20 | Sunrise Oil Sands Partnership | Water injection method for assisting in collection of oil in a sagd oil recovery application |
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