CN105134153B - Fireflooding ignition method and pipe column thereof - Google Patents
Fireflooding ignition method and pipe column thereof Download PDFInfo
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- CN105134153B CN105134153B CN201510562728.8A CN201510562728A CN105134153B CN 105134153 B CN105134153 B CN 105134153B CN 201510562728 A CN201510562728 A CN 201510562728A CN 105134153 B CN105134153 B CN 105134153B
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- 238000000034 method Methods 0.000 title claims abstract description 32
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- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
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- 238000007254 oxidation reaction Methods 0.000 abstract description 12
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- 238000006073 displacement reaction Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 149
- 239000007789 gas Substances 0.000 description 10
- 239000010779 crude oil Substances 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 6
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- 241000209094 Oryza Species 0.000 description 3
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- 230000008859 change Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000010793 Steam injection (oil industry) Methods 0.000 description 2
- 239000002671 adjuvant Substances 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 230000002269 spontaneous effect Effects 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
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- 230000003628 erosive effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
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Abstract
The invention provides a fire flooding ignition method and a pipe column thereof, wherein in the fire flooding ignition method, the pipe column is firstly put into an injection well, and then air is simultaneously injected into an outer pipe and an inner pipe so as to ensure that the air is respectively injected into an oil layer through a first sieve pipe part and an injection head, thereby judging whether the injection well is communicated with a production well for oil extraction; when the result of judgement is injection well and production well intercommunication for producing oil, inject high temperature steam into the outer tube, inject air into the inner tube simultaneously to with the leading-in oil reservoir that is located between first packer and the second packer of high temperature steam, and with the leading-in oil reservoir that is located the second packer below of air, thereby make the oil reservoir burning. By adopting the fire flooding ignition method and the pipe column thereof, the temperature and the oxidation heat release speed of the oil layer can be rapidly improved by adopting a method of injecting air and steam in layers, so that the oil layer can rapidly reach the ignition point, the longitudinal utilization degree of the stratum is increased, and the displacement effect of thick oil is improved.
Description
Technical field
The present invention relates to oil exploration technology field, and in particular to a kind of fireflood ignition method and its tubing string.
Background technology
Fireflood is also referred to as combustion in situ, refer to a kind of electricity consumption, it is chemical the methods of reservoir temperature is reached crude oil burning-point, and to oil
Injection air or oxygen makes the oil production method of Crude Oil sustained combustion in layer.During fire flood, successful ignition is fireflood
One of key technology of technology application success.
At present, the sparking mode of fireflood mainly has three kinds, and the first is steam injection spontaneous ignition, and it first injects in oil well
A certain amount of steam preheating oil reservoir, is then injected into air, and oil reservoir is lighted using the oxidation heat liberation of air and deep fat.Second is change
Combustion-assistant ignition is learned, its ignition process can be added chemical combustion adjuvant on the basis of steam injection spontaneous ignition, is blown into using air
In stratum, by combustion adjuvant heat release/reduction crude oil reaction activity, firing temperature is reduced, reduces the duration of ignition.The third is electricity
Igniting, its ignition process can utilize electric heater, heat air, utilize hot-air and crude oil rapid reaction exothermic ignition oil
Layer.
In first two sparking mode, due to needing to inject a certain amount of steam before air injection, and air is being noted with steam
Certain pressure differential during entering be present, there is operation time interval centre, therefore easily causes stratum in implementation process at the scene
Crude oil or swelling enter in gas injection pit shaft, so, the deep fat reaction in the air and pit shaft that are subsequently implanted into, heat release, cause pit shaft to be grown
Phase is in high temperature and the environment of corrosion, easily causes set to damage.And the mode of the third electric ignition, its application are wider, but
It is due to that its power has certain limitation, for long well section without the oil reservoir every interlayer, its heat time is longer and manipulation is difficult
Spend larger.Therefore, it is necessary to study a kind of new sparking mode.
The content of the invention
Embodiments of the invention provide a kind of fireflood ignition method and its tubing string, are run into solve existing fireflood sparking mode
Easy set damage and manipulation difficulty it is big the problem of.
The above-mentioned purpose of the embodiment of the present invention can be realized using following technical proposal：
A kind of fireflood ignition method, comprises the following steps：
Into injection well, tripping in sequentially passes through the tubing string of stratum and oil reservoir, and the tubing string includes：
Sleeve pipe, described sleeve pipe have at least two sections of perforations；
The outer tube being set in described sleeve pipe, its one end are stretched into the oil reservoir；
First packer, it is arranged between described sleeve pipe and the outer tube, and in oil reservoir；
Second packer, it is arranged between described sleeve pipe and the outer tube, and below first packer
In oil reservoir；
The perforation of at least one section described sleeve pipe is between first packer and second packer, at least one section
The perforation of described sleeve pipe is located at the lower section of second packer；
First phloem, it is arranged on the outer tube, and positioned at first packer and second packer it
Between locate；
The outer tube is stretched out in the inner tube being set in the outer tube, one end that said inner tube is located in oil reservoir；
First seal, it is set in outside said inner tube and is arranged on the end that the outer tube stretches into oil reservoir；
Injection head, it is arranged on the end that said inner tube stretches out the outer tube；
Inject air simultaneously into the outer tube and said inner tube so that air respectively by first phloem and
In the injection head injection oil reservoir, so as to judge whether the injection well connects with the producing well for recovering the oil；
When the result judged connects as the injection well with the producing well for recovering the oil, high temperature steaming is injected into outer tube
Vapour, while air is injected into inner tube, by high-temperature steam import positioned at first packer and second packer it
Between oil reservoir, and direct the air into the oil reservoir below second packer, so that oil reservoir burns.
In one embodiment, the outer tube above first packer include be sequentially connected the first insulated tubing, stretch
Contracting oil pipe and the second insulated tubing.
In one embodiment, it is connected with oil pipe between second packer and the first seal, described second
Also include the second phloem and the 3rd packer between packer and the oil pipe, the 3rd packer is arranged on described sleeve pipe
Between the outer tube.
In one embodiment, the perforation in described sleeve pipe and the injection head, first phloem sieve aperture and
The sieve aperture of second phloem is corresponding.
In one embodiment, the 3rd phloem, tail pipe and the second seal institute that the injection head is sequentially connected
Instead of aperture gradually increases the sieve aperture of the 3rd phloem from the inside to the outside.
In one embodiment, first packer is located at oil reservoir top circle 5-10 rice, second envelope
It is located at every device at the 1/3-1/2 on oil reservoir top circle.
In one embodiment, before igniting combusts oil reservoir, the concurrently injected air capacity into the outer tube and said inner tube
For 500Nm3/m·d；When igniting combusts oil reservoir, the high-temperature steam amount injected into the outer tube is 100t/d, to said inner tube
The air capacity of middle injection is 300Nm3/m·d。
In one embodiment, in the underlying oil reservoir of the injection head, first phloem oil above
In layer.
In addition, also providing a kind of fireflood igniting tubing string in embodiments of the invention, it includes：
Sleeve pipe, described sleeve pipe have at least two sections of perforations；
The outer tube being set in described sleeve pipe, its one end are stretched into the oil reservoir；
First packer, it is arranged between described sleeve pipe and the outer tube, and in oil reservoir；
Second packer, it is arranged between described sleeve pipe and the outer tube, and below first packer
In oil reservoir；
The perforation of at least one section described sleeve pipe is between first packer and second packer, at least one section
The perforation of described sleeve pipe is located at the lower section of second packer；
First phloem, it is arranged on the outer tube, and positioned at first packer and second packer it
Between locate；
The outer tube is stretched out in the inner tube being set in the outer tube, one end that said inner tube is located in oil reservoir；
First seal, it is set in outside said inner tube and is arranged on the end that the outer tube stretches into oil reservoir；
Injection head, it is arranged on the end that said inner tube stretches out the outer tube；
In ignition process, high-temperature steam is injected into outer tube, while air is injected into inner tube, high-temperature steam is led
Enter the oil reservoir between first packer and second packer, and direct the air into positioned at second packer
In the oil reservoir of lower section, so that oil reservoir burns.
In summary, using the fireflood ignition method and its tubing string in the embodiment of the present invention, layering injection can be used empty
The method of gas and steam quickly improves the temperature and oxidation heat liberation speed of oil reservoir, oil reservoir is rapidly achieved self-ignition point, increases stratum
Vertical producing degree, improve the Flooding Efficiency of viscous crude.
Brief description of the drawings
Accompanying drawing described here is only used for task of explanation, and is not intended in any way to limit model disclosed by the invention
Enclose.In addition, shape and proportional sizes of each part in figure etc. are only schematical, the understanding of the present invention is used to help, and
It is not the specific shape and proportional sizes for limiting each part of the present invention.Those skilled in the art under the teachings of the present invention, can
To select various possible shapes and proportional sizes to implement the present invention as the case may be.
Fig. 1 shows the structural representation of the fireflood igniting tubing string in first embodiment of the invention；
Fig. 2 shows the structural representation of the fireflood igniting tubing string in second embodiment of the invention；
Fig. 3 shows the structural representation of the fireflood igniting tubing string in third embodiment of the invention.
The reference of the figures above：1st, inner tube；11st, injection head；12nd, the 3rd phloem；13rd, tail pipe；14th, the second sealing
Part；2nd, outer tube；21st, the first packer；22nd, the first phloem；23rd, the second packer；24th, oil pipe；25th, first seal；26、
Second phloem；27th, the 3rd packer；3rd, sleeve pipe；31st, perforation；4th, stratum；5th, oil reservoir.
Embodiment
With reference to the description of accompanying drawing and the specific embodiment of the invention, details of the invention can be clearly understood.But
It is the embodiment of invention described herein, is only used for explaining the purpose of the present invention, and can not understands in any way
Into being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that any possible change based on the present invention
Shape, these are regarded as belonging to the scope of the present invention.In embodiments of the present invention " on " refer to the direction of well head, " under " refer to it is remote
From the shaft bottom direction of well head.
As shown in figure 1, the present invention provides a kind of fireflood ignition method, comprise the following steps：Into injection well, tripping in is successively
Through stratum 4 and the tubing string of oil reservoir 5, the tubing string includes：Sleeve pipe 3, described sleeve pipe 3 have at least two sections of perforations 31；It is set in
Outer tube 2 in described sleeve pipe 3, its one end are stretched into the oil reservoir 5；First packer 21, its be arranged on described sleeve pipe 3 with it is described
Between outer tube 2, and in oil reservoir 5；Second packer 23, it is arranged between described sleeve pipe 3 and the outer tube 2, and is located at
In the oil reservoir 5 of the lower section of first packer 21；The perforation 31 of at least one section described sleeve pipe 3 be located at first packer 21 with
Between second packer 26, the perforation 31 of at least one section described sleeve pipe 3 is located at the lower section of second packer 23；First
Phloem 22, it is arranged on the outer tube 2, and is located between first packer 21 and second packer 23；
The outer tube 2 is stretched out in the inner tube 1 being set in the outer tube 2, one end that said inner tube 1 is located in oil reservoir 5；First seal
25, it is set in outside said inner tube 1 and is arranged on the end that the outer tube 2 stretches into oil reservoir 5；Injection head 11, it is arranged on described
Inner tube 1 stretches out the end of the outer tube 2.
Air is injected simultaneously into the outer tube 2 and said inner tube 1, so that air passes through first phloem 22 respectively
And the injection head 11 is injected in oil reservoir 5, so as to judge whether the injection well connects with the producing well for recovering the oil.
When the result judged connects as the injection well with the producing well for recovering the oil, high temperature steaming is injected into outer tube 2
Vapour, while air is injected into inner tube 1, high-temperature steam is imported positioned at first packer 21 and second packer
Oil reservoir 5 between 23, and direct the air into the oil reservoir 5 of the lower section of the second packer 23, so that oil reservoir 5 burns.
In the present embodiment, injection head 11 relative to the first seal 25 close to shaft bottom end.To outer tube 2 and inner tube
Air is injected simultaneously in 1, wherein, the temperature of air is normal temperature.The pressure of injection air will calculate according to strata pressure, stratum
Pressure is high, injects that the pressure of air is higher, and strata pressure is low, and the pressure for injecting air is lower.Air is respectively by described
First phloem 22 of outer tube 2 and the injection head 11 of said inner tube 1 are injected in the oil reservoir 5, with cause the injection well with
Producing well for oil recovery connects, and establishes discharge flue.High-temperature steam is injected into outer tube 2 again, while sky is injected into inner tube 1
Gas；High-temperature steam in the outer tube 2 flows to the oil reservoir 5 of the top through the perforation 31 on the first phloem 22 and sleeve pipe 3
In, the oil reservoir 5 is heated, reaches viscous crude burning-point；Air in said inner tube 1 is through the perforation 31 on injection head 11 and sleeve pipe 3
In the oil reservoir 5 for flowing to the lower section, oxidation reaction occurs for the viscous crude with reaching burning-point, and burn the oil reservoir 5.
In the present embodiment, the tubing string of injection well sequentially passes through stratum 4 and oil reservoir 5, and the inner tube 1 of the tubing string includes one
The pipeline stretched into oil reservoir 5, it is connected in the pipeline away from being used to injecting the injection head 11 of air with one at uphole end, can be with
A certain amount of air is injected into inner tube 1 using air compressor machine.
First packer 21 is set in the oil jacket annular space between outer tube 2 and sleeve pipe 3, with to isolation stratum 4 and production oil
Layer 5, the second packer 23 is also set in the oil jacket annular space between outer tube 2 and sleeve pipe 3, prevents gas and inner tube 1 in outer tube 2
In gas just mixed in sleeve pipe 3 when not respectively enteing oil reservoir also.First seal 25 can be plug, but be not limited to
This.
Sleeve pipe 3 is close to borehole wall tripping in, has perforation 31 on the tube wall of sleeve pipe 3, and perforation 31 can make the air in tubing string
And/or high-temperature steam is entered in oil reservoir 5 by perforation 31.
After running string, the air is injected in the oil reservoir 5 by the first phloem 22 and injection head 11 respectively,
To cause the injection well with being connected for the producing well to recover the oil, to establish discharge flue, make caused cigarette after ignition oil reservoir
Gas is gone out by producing well rapid drainage, and wherein producing well is arranged on around injection well.Make to prestore in oil reservoir 5 simultaneously a certain amount of
Oxygen, to prevent that, in ignition oil reservoir 5, air compressor machine injectability deficiency causes combustion efficiency to be deteriorated.In addition, lighting a fire
Burn after oil reservoir 5, hot tail gas is pushed ahead, and heats unburned oil reservoir 5, due to a certain amount of air that prestored in oil reservoir 5, heat
Tail gas promotes oxidation reaction heat release, further improves the temperature of oil reservoir 5.
Air has been injected in inner tube 1 and outer tube 2 and then into outer tube 2 has injected high-temperature steam simultaneously, has been noted into inner tube 1
Enter air.Now, producing well takes closing well 7-15 days, and after igniting finishes, producing well, which drives a well, to be produced.In ignition process, note
Enter the oil reservoir that the high-temperature steam in the outer tube 2 in well flows to the top through the perforation 31 on the first phloem 22 and sleeve pipe 3
In 5, the oil reservoir 5 is heated, reaches viscous crude burning-point；Air in said inner tube 1 is through the perforation on injection head 11 and sleeve pipe 3
31 flow in the oil reservoir 5 of the lower section, and oxidation reaction occurs for the viscous crude with reaching burning-point, and burn the oil reservoir 5.Due to the injection
First 11 relative to the phloem 22 of first seal 25 and first close to shaft bottom end, that is to say, that 11 underlying oil of injection head
In layer 5, and in the sieve aperture of the first phloem 22 oil reservoir 5 above, so in ignition oil reservoir 5, inner tube 1 and outer tube
2 equivalent to layering injection air and steam.The first screen casing in oil reservoir 5 above is passed through by the high-temperature steam that outer tube 2 injects
Perforation 31 on the sieve aperture in portion 22, sleeve pipe 3 enters oil reservoir 5, the oil reservoir 5 of top is first contacted with high-temperature steam.And pass through inner tube 1
The air of injection enters oil reservoir 5 by the injection head 11 in lower section oil reservoir 5, the perforation 31 on sleeve pipe 3, makes the oil reservoir of lower section
5 elder generations and air contact.
Because the high-temperature steam injected in outer tube 2 is high-temperature water vapor, wherein at 300 DEG C or so, moisture content exists temperature
25% or so, therefore, high-temperature water in the oil reservoir 5 below the effect flow direction of gravity, can heat the oil reservoir 5 of lower section, while can be with
Viscous crude is set to reduce viscosity, beneficial to the burning of viscous crude.And 75% or so dry saturated steam heat release when being contacted with oil reservoir 5, make high temperature
Dry saturated steam is liquefied as high-temperature water, and high-temperature water is equally flowed to by Action of Gravity Field in the oil reservoir 5 of lower section, heats the oil reservoir 5 of lower section, so
Repeatedly, it is gradually heated up oil reservoir 5.
While oil reservoir 5 is heated by high-temperature steam, due to constantly injecting substantial amounts of air in inner tube 1, the oxygen in air
Gas reacts with heated viscous crude, and reaching the burning-point of viscous crude makes viscous crude burn, and pushes ahead the sprawling of live wire, constantly drives unburned
The oil reservoir 5 of burning burns so that viscous crude has mobility, convenient exploitation.
Using the fireflood ignition method in the embodiment of the present invention, the method that can use layering injection air and steam is quick
The temperature and oxidation heat liberation speed of oil reservoir 5 are improved, oil reservoir 5 is rapidly achieved self-ignition point, increases the vertical producing degree on stratum.Together
When, due to air oxidation burn oil reservoir 5 when, low-temperature oxidation area be present, low-temperature oxidation can increase crude oil heavy constituent, cause crude oil
Thickening, mobility is deteriorated, and has the presence of steam, can improve the rheological characteristic of thickening crude oil, reduces the scope of low-temperature oxidation, improves
The Flooding Efficiency of viscous crude.
In one embodiment, the outer tube 2 of the top of the first packer 21 includes the first insulation oil being sequentially connected
Pipe, telescopic oil tube and the second insulated tubing (not shown).That is, outer tube 2 is connected successively by well head to shaft bottom direction
It is connected to the first insulated tubing, telescopic oil tube, the second insulated tubing, the first packer 21, the first phloem 22, the second packer
23rd, oil pipe 24 and the first seal 25 for sealing.Due in combustion in situ 5, with closer to the distance common of oil reservoir 5
The deformation of oil pipe easy expanded by heating, so with the packing of the first insulated tubing, telescopic oil tube and the second insulated tubing connection first
Device 21, heat can be completely cut off when oil reservoir 5 burns, and telescopic oil tube is deformable flexible, plain tubing can be prevented to be heated
Deformed damaged.
In one embodiment, accompanying drawing 2 is referred to, is connected between second packer 23 and the first seal 25
Oil pipe 24 is connected to, the second phloem 26 and the 3rd packer 27 are also included between second packer 23 and the oil pipe 24,
3rd packer 27 is arranged between described sleeve pipe 3 and the outer tube 2.The quantity of increase phloem can increase by outer tube
The high-temperature steams of 2 injections and/or the amount of air, being capable of more preferable heated oil reservoir 5.Of course, in the present embodiment, phloem
Quantity be also not limited to two, three or more can be selected according to the thickness of oil reservoir 5, and make increased phloem with envelope
Alternately connected every device, the end until last packer is connected with oil pipe 24.
In one embodiment, the perforation 31 in described sleeve pipe 3 and the injection head 11, first phloem 22
The sieve aperture of sieve aperture and second phloem 26 is corresponding.Specifically, the position of perforation 31 on sleeve pipe 3, it should avoid oil
Layer 5 is pushed up at boundaries 1/3, and is avoided at the upper and lower end face 1.5m of the second packer 23 after setting or the 3rd packer 27.
In one embodiment, as shown in figure 3, the 3rd phloem 12, tail pipe that the injection head 11 is sequentially connected
13 and second seal 14 replaced, aperture gradually increases the sieve aperture of the 3rd phloem 12 from the inside to the outside.Wherein,
Two seals 14 can be plug.It can so make it that the air in inner tube 1 is a greater amount of, faster enters in stratum 5.By
Small in the medial aperture of sieve aperture, the pressure of air is big, is more effectively pierced out from the sieve aperture of screen casing, and the outside aperture of sieve aperture is big, can be with
So that air spreads evenly in oil reservoir 5, gas is set to be more easy to be in contact with oil reservoir 5, ignite oil reservoir 5.Meanwhile the 3rd phloem
The tail pipe 13 and second seal 14 of 12 lower sections are engaged, and can be accepted the internal cause pressure-air of inner tube 1 and be flowed through the corruption of tube wall internal oxidition
Iron filings caused by erosion, prevent iron filings from entering oil reservoir 5, block pore throat passage.
In one embodiment, first packer 21 is located at the circle's 5-10 rice of the oil reservoir 5 top, and described the
Two packers 23 are located at the 1/3-1/2 on the oil reservoir 5 top circle.
Further say, before igniting combusts oil reservoir 5, into the outer tube 2 and said inner tube 1, concurrently injected air capacity is
500Nm3/m·d；During ignition oil reservoir 5, the high-temperature steam amount injected into the outer tube 2 is 100t/d, to said inner tube 1
The air capacity of middle injection is 300Nm3/ md, the duration of ignition are about 5 days.
In one embodiment, in the underlying oil reservoir 5 of the injection head 11, first phloem 22 is positioned at upper
In the oil reservoir 5 of side.The high-temperature steam in outer tube 2 can be so set to be progressively heated at the oil reservoir 5 of lower section by the oil reservoir 5 of top, it is interior
Oil reservoir 5 below the air contact injected in pipe 1, the oil reservoir 5 for lower section of first igniting, make viscous crude that there is mobility, convenient exploitation.And
And the oil reservoir 5 of lower section can promote live wire to the unburned direction of Heavy Oil Reservoir 5, drive the oil reservoir 5 of top heating to burn.
Meanwhile present invention also offers a kind of fireflood igniting tubing string, it includes：Sleeve pipe 3, described sleeve pipe 3 have at least two
Section perforation 31；The outer tube 2 being set in described sleeve pipe 3, its one end are stretched into the oil reservoir 5；First packer 21, it is arranged on
Between described sleeve pipe 3 and the outer tube 2, and in oil reservoir 5；Second packer 23, its be arranged on described sleeve pipe 3 with it is described outer
Between pipe 2, and in the oil reservoir 5 of the lower section of the first packer 21；The perforation 31 of at least one section described sleeve pipe 3 is positioned at described
Between first packer 21 and second packer 23, the perforation 31 of at least one section described sleeve pipe 3 is positioned at the described second packing
The lower section of device 23；First phloem 22, it is arranged on the outer tube 2, and is located at first packer 21 and described second
Locate between packer 23；The inner tube 1 being set in the outer tube 2, one end that said inner tube 1 is located in oil reservoir 5 are stretched out described outer
Pipe 2；First seal 25, it is set in outside said inner tube 1 and is arranged on the end that the outer tube 2 stretches into oil reservoir 5；Injection head
11, it is arranged on the end that said inner tube 1 stretches out the outer tube 2.
In one embodiment, in ignition process, high-temperature steam is injected into outer tube 2, while inject into inner tube 1
Air, high-temperature steam is imported into oil reservoir 5 between first packer 21 and second packer 23, and by sky
Conductance enters in the oil reservoir 5 of the lower section of the second packer 23, so that oil reservoir 5 burns.
In one embodiment, the outer tube 2 of the top of the first packer 21 includes the first insulation oil being sequentially connected
Pipe, telescopic oil tube and the second insulated tubing (not shown).
In one embodiment, oil pipe 24 is connected between second packer 23 and the first seal 25,
Also include the second phloem 26 and the 3rd packer 27, the 3rd packing between second packer 23 and the oil pipe 24
Device 27 is arranged between described sleeve pipe 3 and the outer tube 2.
In one embodiment, the perforation 31 in described sleeve pipe 3 and the injection head 11, first phloem 22
The sieve aperture of sieve aperture and second phloem 26 is corresponding.
In one embodiment, the injection head 11 is sequentially connected the 3rd phloem 12, tail pipe 13 and second
Seal 14 is replaced, and aperture gradually increases the sieve aperture of the 3rd phloem 12 from the inside to the outside.Wherein, second seal 14 can
Think plug.
In one embodiment, first packer 21 is located at the circle's 5-10 rice of the oil reservoir 5 top, and described the
Two packers 23 are located at the 1/3-1/2 on the oil reservoir 5 top circle.
In one embodiment, before igniting combusts oil reservoir 5, the concurrently injected sky into the outer tube 2 and said inner tube 1
Tolerance is 500Nm3/m·d；When igniting combusts oil reservoir 5, the high-temperature steam amount injected into the outer tube 2 is 100t/d, to institute
It is 300Nm to state the air capacity injected in inner tube 13/m·d。
In one embodiment, in the underlying oil reservoir 5 of the injection head 11, first phloem 22 is positioned at upper
In the oil reservoir 5 of side.
Using the fireflood ignition method and its tubing string in the embodiment of the present invention, layering injection air and steam can be used
Method quickly improves the temperature and oxidation heat liberation speed of oil reservoir 5, oil reservoir 5 is rapidly achieved self-ignition point, the longitudinal direction for increasing stratum is moved
With degree, the Flooding Efficiency of viscous crude is improved.
Each embodiment in this specification is described by the way of progressive, what each embodiment stressed be with
The difference of other embodiment, between each embodiment identical similar part mutually referring to.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar can understand present disclosure and implement according to this, and it is not intended to limit the scope of the present invention.It is all according to the present invention
The equivalent change or modification that Spirit Essence is made, it should all be included within the scope of the present invention.
Claims (9)
1. a kind of fireflood ignition method, it is characterised in that comprise the following steps：
Into injection well, tripping in sequentially passes through the tubing string of stratum and oil reservoir, and the tubing string includes：
Sleeve pipe, described sleeve pipe have at least two sections of perforations；
The outer tube being set in described sleeve pipe, its one end are stretched into the oil reservoir；
First packer, it is arranged between described sleeve pipe and the outer tube, and in oil reservoir；
Second packer, it is arranged between described sleeve pipe and the outer tube, and the oil reservoir below first packer
It is interior；
The perforation of at least one section described sleeve pipe is between first packer and second packer, at least described in one section
The perforation of sleeve pipe is located at the lower section of second packer；
First phloem, it is arranged on the outer tube, and is located between first packer and second packer；
The outer tube is stretched out in the inner tube being set in the outer tube, one end that said inner tube is located in oil reservoir；
First seal, it is set in outside said inner tube and is arranged on the end that the outer tube stretches into oil reservoir；
Injection head, it is arranged on the end that said inner tube stretches out the outer tube；
Air is injected simultaneously into the outer tube and said inner tube, so that air is respectively by first phloem and described
In injection head injection oil reservoir, so as to judge whether the injection well connects with the producing well for recovering the oil；
When the result judged connects as the injection well with the producing well for recovering the oil, high-temperature steam is injected into outer tube, together
When air is injected into inner tube, high-temperature steam is imported into oil between first packer and second packer
Layer, and direct the air into the oil reservoir below second packer, so that oil reservoir burns.
2. fireflood ignition method according to claim 1, it is characterised in that：Outer tube above first packer includes
The first insulated tubing, telescopic oil tube and the second insulated tubing being sequentially connected.
3. fireflood ignition method according to claim 1, it is characterised in that：Second packer and the described first sealing
Oil pipe is connected between part, the second phloem and the 3rd packer, institute are also included between second packer and the oil pipe
The 3rd packer is stated to be arranged between described sleeve pipe and the outer tube.
4. fireflood ignition method according to claim 3, it is characterised in that：Perforation and the injection in described sleeve pipe
The sieve aperture of head, the sieve aperture of first phloem and second phloem is corresponding.
5. fireflood ignition method according to claim 1, it is characterised in that：The 3rd sieve that the injection head is sequentially connected
Pipe portion, tail pipe and second seal are replaced, and aperture gradually increases the sieve aperture of the 3rd phloem from the inside to the outside.
6. fireflood ignition method according to claim 1, it is characterised in that：First packer is located at apart from the oil
At Ceng Ding circle 5-10 rice, second packer is located at the 1/3-1/2 on oil reservoir top circle.
7. fireflood ignition method according to claim 1, it is characterised in that：Before igniting combusts oil reservoir, to the outer tube and
Concurrently injected air capacity is 500Nm in said inner tube3/m·d；Igniting is when combusting oil reservoir, the high temperature injected into the outer tube
Quantity of steam is 100t/d, and the air capacity injected into said inner tube is 300Nm3/m·d。
8. fireflood ignition method according to claim 1, it is characterised in that：In the underlying oil reservoir of injection head,
In first phloem oil reservoir above.
The tubing string 9. a kind of fireflood is lighted a fire, it is characterised in that it includes：
Sleeve pipe, described sleeve pipe have at least two sections of perforations；
The outer tube being set in described sleeve pipe, its one end are stretched into oil reservoir；
First packer, it is arranged between described sleeve pipe and the outer tube, and in oil reservoir；
Second packer, it is arranged between described sleeve pipe and the outer tube, and the oil reservoir below first packer
It is interior；
The perforation of at least one section described sleeve pipe is between first packer and second packer, at least described in one section
The perforation of sleeve pipe is located at the lower section of second packer；
First phloem, it is arranged on the outer tube, and is located between first packer and second packer；
The outer tube is stretched out in the inner tube being set in the outer tube, one end that said inner tube is located in oil reservoir；
First seal, it is set in outside said inner tube and is arranged on the end that the outer tube stretches into oil reservoir；
Injection head, it is arranged on the end that said inner tube stretches out the outer tube；
In ignition process, high-temperature steam is injected into outer tube, while air is injected into inner tube, high-temperature steam is imported into position
Oil reservoir between first packer and second packer, and direct the air into below second packer
Oil reservoir in so that oil reservoir burn.
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| CN201510562728.8A CN105134153B (en) | 2015-09-07 | 2015-09-07 | Fireflooding ignition method and pipe column thereof |
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| CN201510562728.8A CN105134153B (en) | 2015-09-07 | 2015-09-07 | Fireflooding ignition method and pipe column thereof |
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| CN105134153B true CN105134153B (en) | 2017-11-10 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105464619B (en) * | 2015-12-22 | 2017-12-19 | 中国石油天然气股份有限公司 | Well completion method for in-situ combustion ignition well |
| CN109138941A (en) * | 2018-07-26 | 2019-01-04 | 中国石油天然气股份有限公司 | Separate-layer injection pipe column and separate-layer injection system |
| CN109138942A (en) * | 2018-08-01 | 2019-01-04 | 中国石油天然气股份有限公司 | Separate-layer injection pipe column and separate-layer injection system |
| CN110029976B (en) * | 2019-04-23 | 2021-02-23 | 中国石油大学(华东) | Hot nitrogen-assisted heavy oil reservoir steam huff-puff oil production system and method |
| CN114109332B (en) * | 2020-08-31 | 2023-10-27 | 中国石油天然气股份有限公司 | Combined type three-dimensional in-situ combustion method for thick-layer massive heavy oil reservoir |
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