CN105986794A - Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method - Google Patents
Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method Download PDFInfo
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Abstract
The invention provides an oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal wells and tubular column equipment of the oil extraction method. The SAGD oil extraction method comprises a circulation preheating stage and a production stage which are conducted in sequence. The production stage comprises a lifting technique. The circulation preheating stage comprises the steps that steam is injected into the producing well through the first tubular column equipment; steam is injected into the steam injection well arranged above the producing well in parallel through the second tubular column equipment; and the producing well is made to communicate with the steam injection well. The lifting technique comprises the steps that the first tubular column equipment is reserved when the circulation preheating stage shifts to the production stage; and the well bottom pressure of the steam injection well is increased, so that oil reservoir fluid in the producing well is lifted to the ground through the first tubular column equipment. By the adoption of the technical scheme of the oil extraction method and the tubular column equipment thereof, the problems that in the prior art, working conditions of a lifting technique during SAGD shallow oil extraction are complex, and equipment application is limited are effectively solved.
Description
Technical field
The present invention relates to SAGD Techniques for super heavy oil recovery field, in particular to the oil recovery side of a kind of SAGD dual horizontal well
Method and column apparatus thereof.
Background technology
SAGD (SAGD) technology is used for super heavy oil recovery.In the oil-producing stage, need the profit in producing well
Mixture is lifted to ground.In lifting process, there have that downhole fluid temperature is high, liquid measure big, down-hole there may be hydrogen sulfide to be rotten
The problems such as erosion.
For the lifting technology of SAGD shallow-layer oil exploitation, prior art can use gaslift to complete the lifting of reservoir fluid.Tool
Body is that natural gas is injected producing well flux oil aqueous mixtures, and reduces density, is so more conducive to the lifting of reservoir fluid.But
It is the natural air-air source that said method needs to have abundance at exploitation scene.Produce required source of the gas if can not provide, then above-mentioned
Scheme does not have feasibility.
In order to solve the problem that technique scheme exists, prior art use electric submersible pump realize that reservoir fluid lifts.But
Owing to downhole fluid temperature is high, electric submersible pump is not suitable for working long hours under worst hot case, therefore needs often to examine electric submersible pump
Repair, and then affect production efficiency, so can increase cost.
In order to solve electric submersible pump problem present in lifting technology, prior art use sucker rod pump complete reservoir fluid lifting.
In conjunction with domestic common situation, commonly use sucker rod pump for shallow-layer SAGD exploitation and realize lifting technology, but sucker rod pump is lifted
Process of jacking all there are certain requirements for well track, reservoir buried depth, especially in shallow oil reservoir pit shaft under enter huge discharge oil well pump,
It is easy to rod string eccentric wear.And production process front end pressure reduction is big, producing well horizontal segment rear end development degree reduces.Additionally,
SAGD is proceeded to the oil-producing stage by circulation warm-up phase during recovering the oil to be needed to change a large amount of pipeline equipments to producing well, increases work
Skill complexity.
Therefore, there is process conditions complexity for the lifting technology of SAGD shallow-layer oil exploitation in above-mentioned prior art, and equipment uses and is subject to
The problem of limit.
Content of the invention
Present invention is primarily targeted at oil production method and the column apparatus thereof that a kind of SAGD dual horizontal well is provided, existing to solve
In technology, the lifting technology operating mode of SAGD shallow-layer oil exploitation is complicated, and equipment uses limited problem.
To achieve these goals, according to an aspect of the invention, it is provided the oil production method of a kind of SAGD dual horizontal well,
SAGD oil production method includes circulation warm-up phase and the production phase carrying out successively, and the production phase includes lifting technology, circulation
Warm-up phase includes by the first column apparatus to producing well steam injection, by the second column apparatus to being arranged on above producing well parallel
Steam injection well steam injection, and make producing well connect with steam injection well, lifting technology includes: when circulation warm-up phase proceeds to the production phase
Retain the first column apparatus；Increase the bottom pressure of steam injection well, so that the reservoir fluid in producing well is lifted by the first column apparatus
Rise to ground.
Further, the bottom pressure increasing steam injection well includes: improve the steam injection pressure of steam injection well, to improve the shaft bottom of producing well
Pressure.
Further, the bottom pressure improving producing well includes: make the exploitation resistance more than reservoir fluid for the bottom pressure of producing well,
Exploitation resistance is the resistance that reservoir fluid is lifted to overcome needed for ground.
Further, exploit resistance to include: the frictional resistance between reservoir fluid and the first column apparatus, the gravity of reservoir fluid
And the internal pressure of ground installation.
According to a further aspect in the invention, providing the column apparatus of a kind of SAGD dual horizontal well, column apparatus is used for SAGD
The lifting technology of the oil production method of dual horizontal well, SAGD dual horizontal well includes steam injection well and producing well, and column apparatus is arranged on life
Producing in well, column apparatus includes: sleeve pipe, including the sleeve pipe vertical section being sequentially connected with, sleeve pipe changeover portion and sleeve pipe horizontal segment,
The upper end of sleeve pipe vertical section is connected to the well head of producing well；Screen casing, one end of screen casing is connected in sleeve pipe horizontal segment, and screen casing is along water
Square to extension；Long tube and short tube, parallel is arranged in sleeve pipe, and each extends in screen casing, and short tube is arranged on long tube
Top, long tube protrudes from short tube in the horizontal direction, and wherein, reservoir fluid is lifted to ground by long tube and/or short tube.
Further, being provided with screen pipe hanger in sleeve pipe horizontal segment, screen casing is connected on sleeve pipe by screen pipe hanger.
Further, long tube and short tube are positioned at the end of screen casing and are provided with guide shoe, and the end of guide shoe offers through hole.
Further, long tube includes the first long tube and the second long tube being sequentially connected with, and the second long tube is positioned at the lower section of the first long tube,
The junction of the first long tube and the second long tube is positioned at sleeve pipe changeover portion, and the diameter of the first long tube is more than the diameter of the second long tube.
Further, connected by cross-over sub device between the first long tube and the second long tube.
Further, column apparatus also includes control equipment, and control equipment is arranged on ground and is connected with well head, long tube and short tube
Pass through long tube pipe hanger and short tube pipe hanger respectively and connect on the control device, the opening or closing of control equipment control long tube and short tube.
Further, column apparatus also includes testing tube, and testing tube is arranged in long tube, the two ends of testing tube respectively with long tube
Two ends are concordant.
Application technical scheme, in the oil production method of SAGD dual horizontal well, lifting technology includes: preheated by circulation
Stage retains the first column apparatus in producing well when transferring the production phase to；Increase the bottom pressure of steam injection well, so that in producing well
Reservoir fluid be lifted to ground by the first column apparatus.Use above-mentioned lifting technology, it is not necessary in producing well, increase other
Pumping unit, enormously simplify lifting technology.In the operation of lifting reservoir fluid, only the bottom pressure of producing well need to be made to increase,
Just can reach to lift the purpose of reservoir fluid.Above-mentioned lifting method operating mode is simple, is limited by equipment and geographical conditions are affected little.
Therefore technical scheme effectively solves the lifting technology operating mode complexity of SAGD shallow-layer oil exploitation in prior art, if
The limited problem of standby use.
Brief description
A part of Figure of description constituting the application is used for providing a further understanding of the present invention, and the present invention's is schematic real
Execute example and illustrate for explaining the present invention, being not intended that inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic flow sheet of the embodiment of the lifting technology of the SAGD dual horizontal well according to the present invention；
Fig. 2 shows the structural representation of the embodiment of the column apparatus of the SAGD dual horizontal well according to the present invention.
Wherein, above-mentioned accompanying drawing includes that the following drawings marks:
10th, sleeve pipe；11st, sleeve pipe vertical section；12nd, sleeve pipe changeover portion；13rd, sleeve pipe horizontal segment；131st, screen pipe hanger；20、
Screen casing；30th, long tube；31st, the first long tube；32nd, the second long tube；40th, short tube；50th, guide shoe；60th, cross-over sub device；
70th, equipment is controlled；80th, long tube pipe hanger；90th, short tube pipe hanger；100th, testing tube.
Detailed description of the invention
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.
Describe the present invention below with reference to the accompanying drawings and in conjunction with the embodiments in detail.
In prior art, for the lifting technology of SAGD oil recovery technique, especially for shallow-layer oil exploitation, from circulation preheating
Column apparatus in producing well all need to be taken out when stage proceeds to the production phase, and change a large amount of pumping unit.And because of shallow-layer
The particularity of oil exploitation and the geological condition of China, pumping unit such as electric submersible pump, sucker rod pump etc., all existing can not be steady for a long time
Fixed work, the flimsy problem of equipment, seriously restrict oil well output, increase workover treatment cost.
For above-mentioned problems of the prior art, inventor proposes first in the lifting technology of SAGD oil recovery technique, from
Circulation warm-up phase proceeds to retain the well group equipment in producing well during the production phase, and by properly increasing the bottom pressure of steam injection well
Method realize that reservoir fluid blowing produces.Owing to not needing other pumping unit, the SAGD oil recovery technique of the application is significantly
The processing step simplifying lifting technology, and reduce lifting technology and limited by environment and equipment.
The oil production method of the SAGD dual horizontal well of the present embodiment includes circulation warm-up phase and the production phase carrying out successively.Raw
The product stage includes lifting technology, and circulation warm-up phase includes by the first column apparatus to producing well steam injection, is set by the second tubing string
Standby to the steam injection well steam injection being arranged on parallel above producing well, and make producing well connect with steam injection well.
As it is shown in figure 1, lifting technology comprises the following steps:
The first column apparatus is retained when proceeding to the production phase from circulation warm-up phase；
Increase the bottom pressure of steam injection well, so that the reservoir fluid in producing well is lifted to ground by the first column apparatus.
In the present embodiment, the excessive section of sleeve pipe is sleeve pipe lower curved section.
The technical scheme of application the present embodiment, in the oil production method of SAGD dual horizontal well, lifting technology includes: pre-by circulation
The heat stage retains the first column apparatus in producing well when transferring the production phase to；Increase the bottom pressure of steam injection well, so that producing well
In reservoir fluid be lifted to ground by the first column apparatus.Use above-mentioned lifting technology, it is not necessary in producing well, increase it
His pumping unit, enormously simplify lifting technology.In the operation of lifting reservoir fluid, only the bottom pressure of producing well need to be made to increase
Greatly, it is possible to reach to lift the purpose of reservoir fluid.Above-mentioned lifting method operating mode is simple, is limited by equipment and geographical conditions are affected
Little.Therefore technical scheme effectively solves the lifting technology operating mode complexity of SAGD shallow-layer oil exploitation in prior art,
Equipment uses limited problem.
When circulating warm-up phase, steam injection well and the equal steam injection of producing well, and make steam injection well reach to connect with producing well.From circulation
When warm-up phase proceeds to the production phase, steam injection well continue keep steam injection, producing well well group equipment is constant, and stop steam injection starting turn
Enter to produce.The lifting technology of producing well section specially makes reservoir fluid be lifted to from underground by the first pipe group equipment in producing well
Ground, and then realize that reservoir fluid is exploited.
Certainly, the method for the bottom pressure improving producing well is not limited to improve the steam injection pressure of steam injection well.Due to when the production phase
Steam injection well has connected with producing well, as long as the bottom pressure that therefore can improve steam injection well just can reach to improve the shaft bottom of producing well
The purpose of pressure, concrete mode of operation can need to determine according to real work.
In the technical scheme of the present embodiment, the bottom pressure increasing steam injection well includes improving the steam injection pressure of steam injection well, to improve production
The bottom pressure of well.Owing to, after circulation warm-up phase, producing well has connected with steam injection well, therefore when raising steam injection well
During steam injection pressure, the bottom pressure of producing well there will be pressure linkage and rises.Therefore can by improving the steam injection pressure of steam injection well
To reach to improve the purpose of the bottom pressure of producing well.
In the technical scheme of the present embodiment, in order to realize the blowing production of reservoir fluid.The bottom pressure that must make producing well is big
In the exploitation resistance of reservoir fluid, and then reservoir fluid is made to be lifted to ground from producing well shaft bottom by the first column apparatus.Wherein
Exploitation resistance is the resistance that reservoir fluid is lifted to overcome needed for ground.
In the technical scheme of the present embodiment, exploitation resistance pack includes the frictional resistance between reservoir fluid and the first column apparatus, oil reservoir
The gravity of fluid and the internal pressure of ground installation.Wherein, ground installation is connected with the first column apparatus in producing well,
And control opening or closing of the first column apparatus.Therefore the internal pressure in ground installation is likely to be set by the first tubing string
It standby is transferred under producing well, and form exploitation resistance.
As in figure 2 it is shown, the column apparatus of the present embodiment includes sleeve pipe the 10th, screen casing the 20th, long tube 30 and short tube 40.Sleeve pipe 10 wraps
Including sleeve pipe vertical section the 11st, sleeve pipe changeover portion 12 and sleeve pipe horizontal segment 13, the upper end of sleeve pipe vertical section 11 connects the well head of producing well,
Sleeve pipe vertical section the 11st, sleeve pipe changeover portion 12 and sleeve pipe horizontal segment 13 are sequentially connected with.One end of screen casing 20 is connected to sleeve pipe horizontal segment
In 13, screen casing 20 is horizontally extending.Long tube 30 and short tube 40, parallel is arranged in sleeve pipe 10 and screen casing 20, short
Pipe 40 is arranged on above long tube 30, and the horizontal direction extended distance of long tube 30 is more than the horizontal direction extended distance of short tube 40, its
In, column apparatus is for the lifting technology of the oil production method of SAGD dual horizontal well.SAGD dual horizontal well includes steam injection well and life
Producing well, column apparatus is arranged in producing well.And reservoir fluid is lifted to ground by long tube 30 and/or short tube 40.
The technical scheme of application the present embodiment, column apparatus is for the lifting technology of the oil production method of SAGD dual horizontal well.Lifting
In process of jacking, the bottom pressure in producing well only need to be made more than reservoir fluid to be lifted to the exploitation resistance overcoming needed for ground, just may be used
The long tube 30 by column apparatus for the reservoir fluid and/or short tube 40 is made to be lifted to ground.Above-mentioned lifting technology does not needs at producing well
Middle replacing pumping unit, and affected by environment little, and technique is simple.Therefore the technical scheme of the present embodiment effectively solves existing
The lifting technology operating mode having SAGD shallow-layer oil exploitation in technology is complicated, and equipment uses limited problem.
As in figure 2 it is shown, in the technical scheme of the present embodiment, be provided with screen pipe hanger 131, screen casing in sleeve pipe horizontal segment 13
20 are connected on sleeve pipe 10 by screen pipe hanger 131.Screen pipe hanger 131 can make screen casing 20 and sleeve pipe 10 connect tighter
Close, prevent screen casing 20 from damaging at work, increase equipment life.
As in figure 2 it is shown, in the technical scheme of the present embodiment, the end of the horizontally extending part of long tube 30 and short tube 40
Portion is provided with guide shoe 50.Guide shoe 50 plays guide effect in long tube 30 and short tube 40 installation process, makes long tube 30 and short
What pipe 40 was more prone to is lowered in producing well, and prevents long tube 30 and short tube 40 to be worn in installation process medial end portions.
Flowing into long tube 30 or short tube 40 for the ease of reservoir fluid, the end of guide shoe 50 offers through hole.
As in figure 2 it is shown, in the technical scheme of the present embodiment, owing to the space in screen casing 20 is more narrow, long tube 30 includes
First long tube 31 and the second long tube 32.Concrete: the first long tube 31 extends in sleeve pipe changeover portion 12 from the well head of producing well,
One end of free end and the second long tube 32 that first long tube 31 is positioned at sleeve pipe changeover portion 12 connects, and the second long tube 32 extends to
In screen casing 20, the diameter of the first long tube 31 is more than the diameter of the second long tube 32, logical between the first long tube 31 and the second long tube 32
Cross cross-over sub device 60 to connect.Certainly, the connected mode between the first long tube 31 and the second long tube 32 is not limited to use conversion
Short-circuit device 60 connects, and uses other connected mode, such as arrange cone section between the first long tube 31 and the second long tube 32,
Concrete connected mode needs to determine according to real work.
As in figure 2 it is shown, in the technical scheme of the present embodiment, column apparatus also includes control equipment 70, control equipment 70 is arranged
Being connected on ground and with well head, long tube 30 and short tube 40 are connected to control by long tube pipe hanger 80 and short tube pipe hanger 90 respectively and set
On standby 70, control equipment 70 controls opening or closing of long tube 30 and short tube 40.
By control equipment 70 opening or closing control to long tube 30 and short tube 40, the column apparatus of the present embodiment has three kinds
Oil production method, including long tube 30 recovers the oil, short tube 40 recovers the oil and long tube 30 and short tube 40 recover the oil simultaneously.Specifically, long tube
The reservoir fluid exploitation of 30 posterior segments being used for producing well, short tube 40 is for the reservoir fluid exploitation of the middle leading portion of producing well.Specifically
Which kind of oil production method above-mentioned is used to determine according to the connecting degree of dual horizontal well: in the case of dual horizontal well connecting degree is uniform,
Use long tube 30 and short tube 40 to recover the oil simultaneously；If dual horizontal well leading portion connecting degree is good, back segment connecting degree difference, then use
Long tube 30 recovers the oil；If dual horizontal well back segment connecting degree is good, leading portion connecting degree difference, then use short tube 40 to recover the oil.
As in figure 2 it is shown, in the technical scheme of the present embodiment, column apparatus also includes testing tube 100, testing tube 100 is arranged in
In long tube 30, the two ends of testing tube 100 are concordant with the two ends of long tube 30 respectively.Testing tube 100 is for measuring each of producing well
Item parameter, such as downhole temperature, pressure detecting etc..Data measured by testing tube 100 can as SAGD produce analyze and
The foundation of parameter regulation and control.
In the present embodiment, lifting technology is likely due to the reason such as overhaul of the equipments or equipment fault, needs producing well to stop note
Vapour, or stop reservoir fluid exploitation.The down-hole local temperature that aforesaid operations may result in producing well reduces, and is resuming production
During reservoir fluid be difficult to be lifted to ground.At this moment can inject a small amount of steam in producing well by long tube or short tube, rise
To the effect of heating column apparatus, and then restart lifting technology, make reservoir fluid be lifted to ground.
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 within the spirit and principles in the present invention, any modification of being made, etc.
With replacement, improvement etc., should be included within the scope of the present invention.
Claims (11)
1. an oil production method for SAGD dual horizontal well, described SAGD oil production method include the circulation warm-up phase that carries out successively with
And the production phase, the described production phase includes lifting technology,
Described circulation warm-up phase includes by the first column apparatus to producing well steam injection, by the second column apparatus to setting parallel
Put the steam injection well steam injection above described producing well, and make described producing well connect with described steam injection well,
It is characterized in that, described lifting technology includes:
Described first column apparatus is retained when proceeding to the described production phase from described circulation warm-up phase；
Increase the bottom pressure of described steam injection well, so that the reservoir fluid in described producing well is lifted by described first column apparatus
Rise to ground.
2. oil production method according to claim 1, it is characterised in that the bottom pressure of described increase described steam injection well includes:
Improve the steam injection pressure of described steam injection well, to improve the bottom pressure of described producing well.
3. oil production method according to claim 2, it is characterised in that the bottom pressure of the described producing well of described raising includes:
Making the exploitation resistance more than described reservoir fluid for the described bottom pressure of described producing well, described exploitation resistance is described oil
Hide fluid lift to the resistance overcoming needed for ground.
4. oil production method according to claim 3, it is characterised in that described exploitation resistance includes: described reservoir fluid and institute
State the internal pressure of the frictional resistance between the first column apparatus, the gravity of described reservoir fluid and ground installation.
5. the column apparatus of a SAGD dual horizontal well, it is characterised in that described column apparatus is adopted for SAGD dual horizontal well
The lifting technology of oil method, described SAGD dual horizontal well includes steam injection well and producing well, and described column apparatus is arranged on institute
Stating in producing well, described column apparatus includes:
Sleeve pipe (10), including the sleeve pipe vertical section (11) being sequentially connected with, sleeve pipe changeover portion (12) and sleeve pipe horizontal segment (13),
The upper end of described sleeve pipe vertical section (11) is connected to the well head of described producing well；
Screen casing (20), one end of described screen casing (20) is connected in described sleeve pipe horizontal segment (13), described screen casing (20)
Horizontally extending；
Long tube (30) and short tube (40), parallel is arranged in described sleeve pipe (10), and each extends to described screen casing
(20), in, described short tube (40) is arranged on the top of described long tube (30), and described long tube (30) is in described level
Direction protrudes from described short tube (40),
Wherein, reservoir fluid passes through described long tube (30) and/or described short tube (40) is lifted to ground.
6. column apparatus according to claim 5, it is characterised in that be provided with screen casing in described sleeve pipe horizontal segment (13) and hang
Hanging device (131), described screen casing (20) is connected on described sleeve pipe (10) by described screen pipe hanger (131).
7. column apparatus according to claim 5, it is characterised in that described long tube (30) and described short tube (40) are positioned at
End in described screen casing (20) is provided with guide shoe (50), and the end of described guide shoe (50) offers through hole.
8. column apparatus according to claim 5, it is characterised in that described long tube (30) includes that be sequentially connected with first is long
Pipe (31) and the second long tube (32), described second long tube (32) is positioned at the lower section of described first long tube (31), described
The junction of the first long tube (31) and described second long tube (32) is positioned at described sleeve pipe changeover portion (12), and described
The diameter of one long tube (31) is more than the diameter of described second long tube (32).
9. column apparatus according to claim 8, it is characterised in that described first long tube (31) and described second long tube (32)
Between by cross-over sub device (60) connect.
10. column apparatus according to claim 5, it is characterised in that described column apparatus also includes control equipment (70), institute
State control equipment (70) be arranged on ground and be connected with described well head, described long tube (30) and described short tube (40) point
Tong Guo long tube pipe hanger (80) and short tube pipe hanger (90) not be connected on described control equipment (70), described control equipment
(70) opening or closing of described long tube (30) and described short tube (40) is controlled.
11. column apparatus according to claim 5, it is characterised in that described column apparatus also includes testing tube (100), institute
State in testing tube (100) is arranged in described long tube (30), the two ends of described testing tube (100) respectively with described long tube
(30) two ends are concordant.
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| CN201510098490.8A CN105986794A (en) | 2015-03-05 | 2015-03-05 | Oil extraction method for steam assisted gravity drainage (SAGD) dual horizontal well and tubular column equipment of oil extraction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109138976A (en) * | 2018-07-23 | 2019-01-04 | 中国石油天然气股份有限公司 | Dual horizontal well preheats the judgment method and dual horizontal well preheating device for turning SAGD opportunity |
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