CN106968649A - The ignition method and recovery method of channeling oil reservoir - Google Patents
The ignition method and recovery method of channeling oil reservoir Download PDFInfo
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- CN106968649A CN106968649A CN201710287745.4A CN201710287745A CN106968649A CN 106968649 A CN106968649 A CN 106968649A CN 201710287745 A CN201710287745 A CN 201710287745A CN 106968649 A CN106968649 A CN 106968649A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 230000005465 channeling Effects 0.000 title claims abstract description 48
- 238000011084 recovery Methods 0.000 title claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 157
- 239000007924 injection Substances 0.000 claims abstract description 157
- 238000004519 manufacturing process Methods 0.000 claims abstract description 24
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims description 42
- 241000209094 Oryza Species 0.000 claims description 13
- 235000007164 Oryza sativa Nutrition 0.000 claims description 13
- 235000009566 rice Nutrition 0.000 claims description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 271
- 239000010410 layer Substances 0.000 description 42
- 239000007789 gas Substances 0.000 description 22
- 238000007254 oxidation reaction Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- 230000003647 oxidation Effects 0.000 description 11
- 238000009413 insulation Methods 0.000 description 9
- 239000003129 oil well Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000010793 Steam injection (oil industry) Methods 0.000 description 6
- 239000011229 interlayer Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000004308 accommodation Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000010779 crude oil Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000011534 incubation Methods 0.000 description 2
- 231100000518 lethal Toxicity 0.000 description 2
- 230000001665 lethal effect Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 235000020681 well water Nutrition 0.000 description 2
- 239000002349 well water Substances 0.000 description 2
- 238000010794 Cyclic Steam Stimulation Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000005417 food ingredient Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 238000005247 gettering Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 235000013324 preserved food Nutrition 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- 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
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
- E21B43/1185—Ignition systems
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
- Fats And Perfumes (AREA)
Abstract
The invention discloses a kind of ignition method of channeling oil reservoir and recovery method, wherein, the ignition method includes injecting air into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well, and detects the product in producing well；When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；And detect the temperature change of pre-position in the injection well；When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection steam, production is started by the second tubing string in the producing well；The air themperature of the injection well exit position is obtained, when the outlet temperature reaches the second preset temperature, tripping in igniter is injected into well to described, will be lighted a fire under the igniter to unlatching igniter behind the circle of oil reservoir bottom.The ignition method and recovery method for the channeling oil reservoir that the present invention is provided, can greatly improve the ignition success rate and exploitation effect of channeling heavy crude reservoir.
Description
Technical field
The present invention relates to combustion in situ oil recovery field, the ignition method and recovery method of more particularly to a kind of channeling oil reservoir.
Background technology
Viscous crude refers to that under conditions of formation temperature and degassing viscosity is more than 100mPa.s (mpas) high viscosity weight
Matter crude oil.Size according to viscosity can be divided into common heavy oil (100 to 10000mPa.s), special thick oil (10000 to
50000mPa.s) with super-viscous oil (being more than 50000mPa.s).In the oil exploitation in oil field, because there is viscous crude special height to glue
The characteristic of degree and high-solidification point, the poor fluidity in reservoir and pit shaft, conventional exploitation recovery ratio is low, i.e., can not ensure normal warp
Ji yield.In order to ensure rational recovery ratio, recovered the oil often through the viscosity of reduction crude oil.Thickened oil recovery of the prior art
Technology includes heating exploitation technology.Wherein, a kind of is, by injecting steam into oil reservoir, to enter than more typical oil recovery by heating mode
Row cyclic steam stimulation.
For the higher heavy crude reservoir of heavy crude reservoir, particularly porosity and permeability, gulped down by early stage steam
After the mining type told, it may occur that channeling.Specifically, the position for occurring channeling mainly include oil reservoir top and permeability extreme difference compared with
Big oil reservoir.
Wherein, the main cause that channeling easily occurs for oil reservoir top is：The mode of steam injection is typically all in the prior art
General injection mode, upper steam mass dryness fraction is high, and channeling degree is strong, and bottom mass dryness fraction is gradually reduced, identical reservoir condition channeling journey
Degree is weak；Meanwhile, with the increase of steam soak round, increasing is employed on top, employs big formation depletion serious.
In addition, permeability extreme difference specifically refers to the ratio of oil reservoir maximum permeability and minimum permeability, general works as infiltration
When rate extreme difference is more than 4, the permeability extreme difference of the oil reservoir is just larger.The reason for easily channeling occurs for permeability extreme difference larger oil reservoir
It is due to that permeability contrast is big, oil reservoir has stronger inlet capacity, therefore, is channeling layer position.
After early stage steam soak, channeling layer position development degree is much larger than non-channeling layer position, and its oil saturation is very low, and one
As 10% or so.For combustion in situ, low oil saturation is a low lethal factor of ignition success rate.Therefore, it is right
It is thick to solve channeling in the easy heavy crude reservoir for occurring channeling after steam soak, it is necessary to propose a kind of effective ignition method
The problem of oil reservoir ignition success rate is low.
The content of the invention
It is an object of the invention to provide a kind of ignition method of channeling oil reservoir and recovery method, channeling can be greatly improved thick
The ignition success rate and exploitation effect of oil reservoir.
The above-mentioned purpose of the present invention can be realized using following technical proposal：
A kind of recovery method of channeling oil reservoir, including：
The perforation formation that predetermined number is opened up in the position unit length where producing well and injection well are located at oil reservoir is penetrated
Hole section；
Inject into well tripping in first tubing string described, tripping in second tubing string and injection string in the producing well, wherein,
The injection string is extended in oil reservoir with predetermined slant；
Air is injected into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well, and detected
Product in the producing well；
When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；And detect institute
State the temperature change of pre-position in injection well；
When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection steam, pass through
Second tubing string in the producing well is tentatively recovered the oil；
The air themperature of the injection well exit position is obtained, when the air themperature of the injection well exit position reaches
During to the second preset temperature, tripping in igniter is injected into well to described, will be lighted a fire under the igniter to unlatching behind the circle of oil reservoir bottom
Device is lighted a fire；
Recovered the oil by the second tubing string of the producing well.
In one preferred embodiment, the determination formula of perforation number is in the perforated interval unit length：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit
For hole/rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
In one preferred embodiment, before the igniter is lighted a fire, methods described also includes：
Oil pressure is obtained, when the oil pressure is more than default oil pressure, is recovered the oil by the first tubing string of the injection well；
After the oil pressure is less than default oil pressure, the first tubing string of the injection well stops production, and passes through the injection
The first tubing string of well injects the gas of scheduled duration.
In one preferred embodiment, methods described also includes：Pre- to the first concern injection of the injection well
After the long gas of timing, the power of the igniter is improved.
A kind of ignition method of channeling oil reservoir, including：
Air is injected into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well, and detected
Product in producing well；
When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；And detect institute
State the temperature change of pre-position in injection well；
When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection steam, pass through
Second tubing string in the producing well starts production；
The air themperature of the injection well exit position is obtained, when the outlet temperature reaches the second preset temperature,
Inject into well tripping in igniter to described, will be lighted a fire under the igniter to unlatching igniter behind the circle of oil reservoir bottom.
In one preferred embodiment, the first tubing string by injection well injects air into the oil reservoir of oil reservoir
Injection intensity be every meter of side of marking of core intersection 500, and with the strength increase of the every meter of side of marking of core intersection 50/moon.
In one preferred embodiment, the oil reservoir includes multiple oil reservoirs, wherein the oil reservoir positioned at topmost is upper
Precalculated position includes in portion's oil reservoir, the injection well：The top oil reservoir and permeability are more than the oil reservoir of predetermined value.
In one preferred embodiment, first preset temperature is 250 degrees Celsius to 300 degrees Celsius.
In one preferred embodiment, the oil reservoir includes multiple oil reservoirs, wherein under the oil reservoir of foot is
Portion's oil reservoir, the injection well outlet port is located in the bottom oil layer depth bounds.
In one preferred embodiment, second preset temperature is more than 400 degrees Celsius.
In one preferred embodiment, the oil reservoir includes multiple oil reservoirs, in the position of each oil reservoir, described
First tubing string, second tubing string are provided with perforated interval in the position where oil reservoir, and the perforated interval is located at oil reservoir close to the pre- of bottom
Determine in thickness range.
In one preferred embodiment, in the unit length of each perforated interval perforation number according to perforated interval pair
It is the current permeability of the oil reservoir answered, the mean permeability of oil reservoir, theoretical in average perforation number and unit length in unit length
Perforation number is determined.
In one preferred embodiment, the determination formula of described every meter of perforation number of perforated interval is：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit
For hole/rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
In one preferred embodiment, before the igniter is lighted a fire, methods described also includes：
Oil pressure is obtained, when the oil pressure is more than default oil pressure, is recovered the oil by the first tubing string of the injection well；
After the oil pressure is less than default oil pressure, the first tubing string of the injection well stops production, and passes through the injection
The first tubing string of well injects the gas of scheduled duration.
In one preferred embodiment, methods described also includes：Pre- to the first concern injection of the injection well
After the long gas of timing, the power of the igniter is improved.
The features and advantages of the invention are：When being lighted a fire using the ignition method of channeling oil reservoir provided herein,
In overall ignition process, the layer position of original channeling is lighted using steam and air low temperature oxidation heat liberation both sides' heat, because steam
From producing well into injection well pushing course, promote come to be lighter component first, therefore, equivalent to improving injection well
Nearly well oil saturation, the especially oil saturation of light component, the light component low-temperature oxidation rate of heat release of any are high, contribute to
It is rapidly heated, so as to reach that igniting is required.Later use steam and igniter heat light non-channeling layer position, these layer of position oil-containing
Saturation degree is high, easily lights.In addition, the channeling layer position first lighted, forms after thermal field, can up and down conduct heat, contribute to
The temperature field of follow-up layer position to be lighted is improved, auxiliary improves ignition results, channeling heavy crude reservoir can be greatly improved on the whole
Ignition success rate.
Brief description of the drawings
Fig. 1 is a kind of step flow chart of the ignition method of channeling oil reservoir in the application embodiment；
Fig. 2 is a kind of structural representation of well pattern arrangement in the application embodiment；
Fig. 3 is a kind of floor map of well pattern cloth in the application embodiment；
Fig. 4 is a kind of step flow chart of the recovery method of channeling oil reservoir in the application embodiment.
Description of reference numerals：
Injection well 1, first sleeve 10, the first oil pipe 11, note adopt pump 12, the first tail pipe 13, the first plug 14, an injection
Perforated interval 15, the first packer 16, thermal insulation layer 17, producing well 2, the second sleeve pipe 20, the second oil pipe 21, oil well pump 22, the second tail
Pipe 23, the second plug 24, production perforated interval 25, instlated tubular 3, screen casing 31, the second packer 32, perforate 33.
Embodiment
Below in conjunction with the drawings and specific embodiments, technical scheme is elaborated, it should be understood that these
Embodiment is only illustrative of the invention and is not intended to limit the scope of the invention, after the present invention has been read, this area skill
Modification of the art personnel to the various equivalent form of values of the present invention is each fallen within the application appended claims limited range.
Unless otherwise defined, all of technologies and scientific terms used here by the article and the technical field of the application is belonged to
The implication that technical staff is generally understood that is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.
It should be noted that when element is referred to as " being arranged at " another element, it can be directly on another element
Or can also have element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " level ", " on ",
" under ", "left", "right" and similar statement for illustrative purposes only, it is unique embodiment to be not offered as.
The present invention provides a kind of ignition method and well pattern arrangement of channeling oil reservoir, can greatly improve channeling viscous crude oil
The ignition success rate of Tibetan.
Because steam soak is employed, heavy crude reservoir parameter is developed and the change of nearly well water saturation is as shown in table 1, viscous crude
Layer oil saturation before steam soak relative to having substantially reduced, and channeling layer position development degree is much larger than non-channeling layer position, its
Oil saturation is very low, and about 10% or so.For combustion in situ, oil saturation is low be ignition success rate it is low one
Individual lethal factor.
Table 1 has developed heavy crude reservoir parameter and the change of nearly well water saturation
Referring to Fig. 1, the ignition method of the channeling oil reservoir provided in the application embodiment may include steps of.
Step S10：Sky is injected into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well
Gas, and detect the product in producing well；
Step S12：When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；
And detect the temperature change of pre-position in the injection well；
Step S14：When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection and steam
Vapour, production is started by the flow string in the producing well；
Step S16：The air themperature of the injection well exit position is obtained, when the outlet temperature reaches that second presets
During temperature, tripping in igniter is injected into well to described, will be lighted a fire under the igniter to unlatching igniter behind the circle of oil reservoir bottom.
Please referring to a kind of well pattern arrangement provided in Fig. 2 and Fig. 3, the application embodiment can include：Note
Enter well 1 and the producing well 2 to the preset distance of injection well 1；Wherein, the injection well 1 is provided with first sleeve 10, described
Sleeve 10 is provided with injection perforated interval 15, the first sleeve 10 in the depth where oil reservoir and is provided with the first oil pipe 11,
The lower end of first oil pipe 11 is disposed with note and adopts pump 12, the first tail pipe 13 and the first plug 14；The producing well 2
The second sleeve pipe 20 is provided with, second sleeve pipe 20 is provided with production perforated interval 25, described second set in the depth where oil reservoir
The second oil pipe 21 is provided with pipe 20, the lower end of second oil pipe 21 is disposed with oil well pump 22, the second tail pipe 23 and
Two plugs 24；The instlated tubular 3 extended in oil reservoir is additionally provided with second sleeve pipe 20, the instlated tubular 3 is located in oil reservoir
Pipeline section outside be provided with screen casing 31.
In the present embodiment, the well pattern arrangement can be applied is comprising at least an oil reservoir along on depth direction
Oil reservoir in, especially for the oil reservoir of multiple oil reservoirs can be being included along on depth direction.Wherein, in multiple oil reservoirs, appoint
Anticipate between two neighboring oil reservoir is interlayer.
In the present embodiment, well pattern arrangement can include：Injection well 1 and the extremely preset distance of injection well 1
Producing well 2.As shown in figure 3, in single well pattern arrangement, the number of the injection well 1 can be one, and it can be located at
The center position of well pattern arrangement.The number of the producing well 2 can be multiple, for example, can be 8.When producing well 2
Number be 8 when, 8 producing wells 2 can be set evenly around the injection well 1, formed inverted nine-spot pattern.Certainly,
The concrete form of the well pattern arrangement is not limited to the example above, and the application does not make specific limit herein.Specifically,
Well spacing between the injection well 1 and the producing well 2 is producer-injector spacing, wherein, the injection well 1 and the producing well 2
Between well spacing can make accommodation according to actual conditions such as the distributions of actual oil reservoir, specifically, the application is herein not
Make specific limit.
In the present embodiment, the first tubing string in the injection well 1 can be used for injecting air, can be used for carrying out
Production, so that the oil of bottom oil layer be produced.Specifically, first sleeve 10, described first can be provided with the injection well 1
Sleeve pipe 10 is provided with injection perforated interval 15 in the depth where oil reservoir.The injection perforated interval 15 is used for the first sleeve 10
It is connected with oil reservoir.The first oil pipe 11 is provided with the first sleeve 10, the lower end of first oil pipe 11 is disposed with
Note adopts pump 12, the first tail pipe 13 and the first plug 14.Wherein, it is described note adopt a pump 12 both can be used for gas injection can also
For recovering the oil.During note, gas can pass sequentially through oil pipe and note is adopted a pump 12 and entered in oil reservoir.
Before the igniter is lighted a fire, the ignition method of the channeling oil reservoir also includes：Oil pressure is obtained, when the oil
When pressure is more than default oil pressure, recovered the oil by the first tubing string of the injection well 1；After the oil pressure is less than default oil pressure,
The first tubing string of the injection well 1 stops production, and the gas for the first tubing string injection scheduled duration for passing through the injection well 1.
Further, after the gas of scheduled duration is injected to the first concern of the injection well 1, the igniter is improved
Power.
In the present embodiment, the oil pressure can be by enrolling in well head.Specifically, head valve is provided with pressure gauge, well
Mouth tubing valve is communicated on oil pipe, and the pressure in the pressure gauge represents tubing pressure.
When the oil pressure is more than default oil pressure, is recovered the oil, mainly led to by the first tubing string 12 of the injection well 1
Cross and open the note and adopt a pump 12 and recovered the oil.The note adopts a pump 12 for when recovering the oil, primarily directed in steam injection
Afterwards, because the oil gas water in oil reservoir is pushed into injection well 1 by the steam injected in producing well 2, now need to adopt using the note
Pump 12 produces the oil gas water from injection well 1, during preventing that subsequent point is fiery, because steam pushes through the oil come in producing well 2
Air water causes shaft bottom to catch fire.Wherein, the production time that the note adopts a pump 12 can determine according to oil pressure.
When oil pressure is less than 0.5MPa, the note adopts a pump 12 and stops production.At this point it is possible into the injection well 1
Direct tripping in igniter, first opens igniter heated air temperature to 200 DEG C or so, and to the first tubing string of the injection well 1
Interior injection gas, specifically, the gas can be nitrogen.Now, air is persistently injected in the oil jacket annular space of injection well 1.Injection
Nitrogen be used for injection well shaft oil heating displacement into stratum.Specifically, the time of injection nitrogen can be 1-2d
(my god), i.e., described scheduled duration can be by for 1-2 days, certainly, the scheduled duration can be arranged according to the oil gas water in the injection well 1
The difference of artificial situation and accommodation, specifically, the application does not make specific limit herein.
Then the power of raising electric igniter is started.When air themperature is 400 DEG C, total igniting requirement is reached, is now noted
The oil jacket annular space for entering well 1 persistently injects air, is kept for duration of ignition 7-15d.
In the present embodiment, the second sleeve pipe 20 can be provided with the producing well 2, second sleeve pipe 20 is in oil reservoir
The depth at place is provided with production perforated interval 25, second sleeve pipe 20 and is provided with the second oil pipe 21, second oil pipe 21
Lower end be disposed with oil well pump 22, the second tail pipe 23 and the second plug 24.Extension is additionally provided with second sleeve pipe 20
Screen casing 31 is provided with outside instlated tubular 3 into oil reservoir, the pipeline section that the instlated tubular 3 is located in oil reservoir.The instlated tubular 3 be used for
The steam of the high mass dryness fraction of HTHP is injected in oil reservoir, to reduce viscosity of thickened oil.It is provided with the instlated tubular 3 for connecting screen casing
31 and outside oil reservoir perforate 33.
The instlated tubular 3 has relative head end and tail end, wherein, its head end is located in the straight well of producing well 2 section, described
Tail end is stretched into oil reservoir, and particularly when oil reservoir includes multiple oil reservoirs, the tail end is fed through all oil reservoirs, positioned at foot
In oil reservoir.In a specific embodiment, the tail end of the instlated tubular 3 is located at the half position of the producer-injector spacing
Place., can be with relatively inexpensive rational length when the tail end of the instlated tubular 3 is located at the half position of the producer-injector spacing
Degree, which reaches, to be ensured from the steam that instlated tubular 3 injects fully injects each oil reservoir, and then reaches preferable viscosity reducing effect.
In the present embodiment, the number of plies phase that the hop count of the injection perforated interval 15 or production perforated interval 25 can be with oil reservoir
Deng.When oil reservoir in oil reservoir the number of plies be more than 2 layers when, the injection perforated interval 15 or produce perforated interval 25 hop count for 2 sections with
On.Specifically, the perforate 33 of the injection perforated interval 15 can be configured in the way of selective perforating mode, for example can be with
Synthesis is configured according to parameters such as the corresponding permeabilities of oil reservoir, specifically, the application does not make specific limit herein.
In a specific embodiment, the oil reservoir can include the first oil reservoir and the second oil reservoir, first oil
It is interlayer between layer and the second oil reservoir, the injection perforated interval 15 includes the first injection injection perforated interval of perforated interval 15 and second
15, the annular space positioned at the depth where the interlayer and between the oil pipe 11 of first sleeve 10 and first is provided with the first envelope
Every device 16.First packer 16 is used to separate two adjacent oil reservoirs, ensure that from the first oil pipe 11 and first sleeve
The air of annular space injection between 10 reliably can be entered in corresponding oil reservoir by injecting perforated interval 15.In addition, the oil
The oil reservoir of three and the above can be included by hiding, and the injection well 1 is provided with perforated interval in the position of corresponding oil reservoir, and adjacent
The first packer 16 is provided with interlayer between two oil reservoirs.
Further, first packer is additionally provided with thermal insulation layer 17 between adopting a pump 12 to the note below 16.
The thermal insulation layer 17 mainly serves for ensuring igniter outlet air and maintains higher temperature.
For example, the length of the thermal insulation layer 17 can be 50 meters, certainly, the length of the thermal insulation layer 17 is not limited to above-mentioned
Citing, it can make corresponding adjustment according to situations such as the distribution of actual oil reservoir, and the application does not make specific limit herein.Institute
The concrete form for stating thermal insulation layer 17 can be the interlayer with incubation and thermal insulation function set outside oil pipe, in addition, described heat-insulated
Layer 17 can also directly be the tubing string with incubation and thermal insulation function, and the concrete form of the thermal insulation layer 17 is not limited to above-mentioned certainly
Citing, the application does not make specific limit herein.
In a specific embodiment, when the oil reservoir along depth direction include the first oil reservoir and the second oil reservoir,
Wherein, first oil reservoir is located at the top of second oil reservoir, and the first injection perforated interval 15 is located at first oil reservoir
Interior, when the second injection perforated interval 15 is located in second oil reservoir, the note adopts a pump 12 and is located at the described second injection
In perforated interval 15.That is, the note is adopted in the depth bounds where a pump 12 is located at the oil reservoir of extreme lower position, on the one hand
It can be used for injecting air to the oil reservoir, on the other hand can be by the oil extraction in the oil reservoir to ground.
In a specific embodiment, when the oil reservoir along depth direction from top to bottom comprising the first oil reservoir, folder
Layer and the second oil reservoir, the production perforated interval 25 include the first production perforated interval and the second production perforated interval, first production
Perforated interval is located in first oil reservoir, and the second production perforated interval is located in second oil reservoir, the oil well pump 22
In in the described second production perforated interval.That is, the oil well pump 22 is located at the depth bounds where the oil reservoir of extreme lower position
It is interior, it can be flowed downward under gravity after entering the pit shaft of producing well 2 due to oil, by rationally setting the oil well pump 22
Position, can fully produce the oil flowed into oil reservoir in producing well 2.
In one embodiment, the instlated tubular 3 has the first pipeline section being located in second sleeve pipe 20 and is located at
The second pipeline section in oil reservoir, second pipeline section has predetermined slant.
In the present embodiment, the first pipeline section of the instlated tubular 3 can be the second sleeve pipe 20 positioned at the producing well 2
Interior straight well section, its second pipeline section is passed from second sleeve pipe 20, extended in oil reservoir.Second pipeline section and described the
Certain angle is formed between one pipeline section, i.e., described second pipeline section has predetermined slant.Specifically, second pipeline section is oblique
Degree can be between 45 degree to 85 degree, certain predetermined slant can be according to producing well 2 and the well spacing and oil reservoir of injection well 1
The number of plies and the actual conditions such as aggregate depth it is different and different, the application does not make specific limit herein.
In one embodiment, the screen casing 31 is arranged on outside second pipeline section, second pipeline section and the sieve
The position being located on the second packer 32, second pipeline section in oil reservoir is provided between pipe 31 and is provided with perforate 33.
In the present embodiment, second packer 32 is used to be insulated in each oil reservoir, for ensureing during steam injection
Layer steam injection can be realized.The position that second pipeline section is located in oil reservoir is provided with perforate 33, and the steam of injection can lead to
The perforate 33 is crossed to inject in corresponding oil reservoir.Wherein, the perforate 33 can be opened by the sliding sleeve being arranged on second pipeline section
Close and realize.When the perforate 33 is realized by sliding sleeve switch, it, which has, opens and closes two states, can be according to actual needs
Fiery closing is opened into perforate 33.In addition, the perforate 33 can also be realized by other forms, the application does not make specific herein
Limit.
In the present embodiment, the number of second packer 32 is identical with the number of plies of oil reservoir in oil reservoir, so as to ensure
Each oil reservoir is separated, so as to realize that layer steam injection is developed.
When being lighted a fire using above-mentioned well pattern arrangement, it can inject empty into injection well in the way of generally injecting
Gas, the air injected from injection well can be entered in oil reservoir by perforated interval, be conducive to the fry dried food ingredients in oil reservoir to give birth to low-temperature oxidation
Reaction, carries out heat release.Specifically, the intensity of injected air can be every meter of side of marking of core intersection 500.When the injection of air is strong
Spend for every meter of side of marking of core intersection 500, preferable oxidation effectiveness can be reached.Specifically, the intensity of the injection air also may be used
To make accommodation according to the parameter situation of actual oil reservoir, the application does not make specific limit herein.Subsequently can be with every meter
The strength increase of the side of marking of core intersection 50/moon, so as to ensure there are enough air supply amounts in production process.
In the present embodiment, can when injecting air into the oil reservoir of oil reservoir by the first tubing string of the injection well
To be detected to the product in the injection well.Specifically, Tail gas measuring device can be set in the well head of the injection well.
In the present embodiment, the oil reservoir number of the oil reservoir can be with one layer, or multilayer.When detecting the note
Enter when there is tail gas in well, represent that at least there is an oil reservoir occurs low-temperature oxidation reaction with the air of injection.
In most cases, the oil reservoir includes multiple oil reservoirs, wherein the oil reservoir positioned at topmost is top oil reservoir,
Precalculated position includes in the injection well：The top oil reservoir and permeability are more than the oil reservoir of predetermined value.Wherein, the permeability
Represent that the oil reservoir is high oil seepage layer more than predetermined value, its general permeability extreme difference is more than 3.Permeability grade (K mn) is that maximum is oozed
Saturating rate (K max) and the ratio of minimum permeability (K min), show the distribution and difference degree of permeability:K mn=K
Max/K min permeability grades (K mn) are more than l.It is more than 3 oil reservoir for permeability extreme difference, is defined as high permeability zone.
When injecting air, air is preferably injected to the top oil reservoir and high oil seepage layer by injection well.Specific the reasons why
It is as follows：Firstly, since oil reservoir programming rate is quick, high permeability zone gettering ability is strong, stratum temperature during early stage steam injection is handled up
Degree is high, contributes to low-temperature oxidation heat release, air enters the reaction of stratum low-temperature oxidation soon, when other side's note carrys out steam, the heat of steam
Amount plus low-temperature oxidation heat release will dual-heated oil reservoir, oil reservoir programming rate is quick；Secondly, steam/heat water pushes through the head come
Component lighter before this, is raised with formation temperature, is run into low-temperature oxidation after air and is aggravated, further rise, it is easy to catch fire.I.e.
These layer of site can just be fired without igniter.
While steam is injected by the injection string of producing well, the temperature of pre-position in the injection well is detected
Change, by judging injection well pre-position temperature variations, determines next step process.
Represent now to have reached when the temperature of pre-position in the injection well rises to the first preset temperature compared with
The ignition temperature of light component.
It can now stop injecting steam into the injection string of producing well, open in the second tubing string in the producing well
Oil well pump recovered the oil.
Specifically, first preset temperature can be 250 degrees Celsius to 300 degrees Celsius.When temperature reaches said temperature
Duan Shi, represents that oil reservoir catches fire, because lighter component burns temperature on fire with regard to 200-250 DEG C under underground condition.
, can be by way of being layered injection respectively to the producing well when the number of plies of the oil reservoir of the oil reservoir is multilayer
Injection string in inject steam.Injection well air is not stopped in producing well injection steam course, lasting injection.
In the present embodiment, by detecting the air themperature of the injection well exit position, when the outlet port
When the air themperature at place reaches the second preset temperature, tripping in igniter is injected into well to described, by under the igniter to oil reservoir
Igniter is opened behind the circle of bottom to be lighted a fire.That is, in the present embodiment, the initial position of igniter is close to bottom
Oil reservoir position, it is oily because after orlop oil reservoir is lighted when oil reservoir includes multiple oil reservoirs, it is not necessary to move igniting
The heat of layer burning causes reservoir temperature to raise, and the chance of reheating can be obtained when air passes through so that the temperature energy of air
Enough reach that igniting is required.
Wherein, second preset temperature is more than 400 degrees Celsius.When the air themperature of the injection well exit position
When reaching more than 400 degrees Celsius, the oil reservoir of expression now has been able to meet the temperature requirement of electric ignition.
In the application embodiment, in overall ignition process, steam and air low temperature oxidation heat liberation both sides heat point are utilized
Fire the layer position of original channeling because steam from producing well into injection well pushing course, promote come to be lighter group first
Point, therefore, equivalent to improving the nearly well oil saturation of injection well, the especially oil saturation of light component, the light group of a bit
Divide low-temperature oxidation rate of heat release high, help to be rapidly heated, so as to reach that igniting is required.Later use steam and igniter heat
Non- channeling layer position is lighted, these layer of position oil saturation is high, easily lights.In addition, the channeling layer position first lighted, forms thermal field
Afterwards, it can up and down conduct heat, be favorably improved the temperature field of follow-up layer position to be lighted, auxiliary improves ignition results, overall
On can greatly improve the ignition success rate of channeling heavy crude reservoir.
In one embodiment, the oil reservoir includes multiple oil reservoirs, in the position of each oil reservoir, first pipe
Post, second tubing string are provided with perforated interval in the position where oil reservoir, and the perforated interval is located at predetermined thickness of the oil reservoir close to bottom
In the range of.
In the present embodiment, the injection well of the oil reservoir and the corresponding sleeve pipe of the first tubing string of producing well, second tubing string
Layer is provided with the perforated interval for connecting oil reservoir, and the perforated interval can specifically be located at the middle and lower part of oil reservoir, and it can be under
In the predetermined thickness range in portion, for example, can be position below 2/3 thickness of thickness.When steam or air inject from the perforated interval
During oil reservoir, the utilization rate of steam or air can be preferably improved.Specifically, injection steam or air can first with oil reservoir
The oil contact of bottom is reacted, and is subsequently communicated up heat, so as to drive top oil reservoir to flow together.
Further, in the unit length of each perforated interval perforation number according to the current of the corresponding oil reservoir of perforated interval
Permeability, the mean permeability of oil reservoir, theoretical perforation number is determined in average perforation number and unit length in unit length.
Wherein, the determination formula of described every meter of perforation number of perforated interval is：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit
For hole/rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
The determination of every meter of perforation number of perforated interval is illustrated with reference to table 2.
Table 2
| Current permeability | Perforation difference | Perforation calculated value |
| 583.9 | 5 | 11 |
| 308.8 | -5 | 21 |
| 740.2 | 11 | 5 |
| 176.3 | -10 | 26 |
| 560.9 | 4 | 12 |
| 284.8 | -6 | 22 |
By taking first permeability in table 2 as an example, current permeability is 583, and the average value of seepage flow rate is 442, is averagely penetrated
Hole hole count is 16/m, and perforation difference 5=(583-442)/(442/16), then, theoretical perforation quantity are 16-5=11 holes/rice
Referring to Fig. 4, also providing a kind of recovery method of channeling oil reservoir in the application embodiment, following step can be included
Suddenly：
Step S11：Penetrating for predetermined number is opened up in the position unit length where producing well and injection well are located at oil reservoir
Hole forms perforated interval；
Step S13：Inject into well tripping in first tubing string described, tripping in second tubing string and ascending pipe in the producing well
Post, wherein, the injection string is extended in oil reservoir with predetermined slant；
Step S15：Sky is injected into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well
Gas, and detect the product in the producing well；
Step S17：When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；
And detect the temperature change of pre-position in the injection well；
Step S19：When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection and steam
Vapour, is tentatively recovered the oil by the second tubing string in the producing well；
Step S21：The air themperature of the injection well exit position is obtained, when the sky of the injection well exit position
When temperature degree reaches the second preset temperature, inject into well to described under tripping in igniter, the igniter to opening behind the circle of oil reservoir bottom
Igniter is opened to be lighted a fire；
Step S23：Recovered the oil by the second tubing string of the producing well.
In the present embodiment, the position of the producing well or injection well perforated interval can be according to the position of oil reservoir come really
It is fixed.Wherein, the determination formula of perforation number is in the perforated interval unit length：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit
For hole/rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
In addition, the concrete structure and composition of the first tubing string injected into well or the second tubing string in producing well can be with
With reference to the specific descriptions of well pattern arrangement in above-mentioned embodiment, the application will not be repeated here.
In addition, step 15 to step 21 is referred to the igniting embodiment of above-mentioned channeling oil reservoir in above-mentioned recovery method
Specifically describe, specific the application will not be repeated here.
After lighting a fire successfully, it can be recovered the oil by the second tubing string of the producing well.
On the whole, the recovery method of channeling oil reservoir provided herein utilizes well pattern arrangement provided herein
When being lighted a fire, in overall ignition process, air can be injected by injection well, steam is injected by producing well, steam is utilized
The layer position of original channeling is lighted with air low temperature oxidation heat liberation both sides' heat, because steam is from producing well to injection well pushing course
In, what promotion came first is lighter component, therefore, equivalent to the nearly well oil saturation of injection well is improved, especially gently
The oil saturation of component, the light component low-temperature oxidation rate of heat release of any is high, helps to be rapidly heated, so as to reach that igniting will
Ask.Later use steam and igniter heat light non-channeling layer position, and these layer of position oil saturation is high, easily lights.In addition,
The channeling layer position first lighted, forms after thermal field, can conduct heat up and down, is favorably improved the temperature of follow-up layer position to be lighted
, auxiliary improves ignition results, and the ignition success rate of channeling heavy crude reservoir can be greatly improved on the whole.After lighting a fire successfully,
The mode developed using fireflood can effectively be exploited to channeling oil reservoir.
Herein cited any digital value all include between lower limit to higher limit with the lower value of an incremented and
The all values of upper value, the interval that there are at least two units between any lower value and any much higher value.For example, such as
Fruit elaborates that the quantity of part or the value of process variable (such as temperature, pressure, the time) are from 1 to 90, preferably from 20
To 80, more preferably from 30 to 70, then purpose is to illustrate that such as 15 to 85,22 are also clearly listed in the specification arrives
68th, 43 to 51,30 to 32 is equivalent.For the value less than 1, it is 0.0001,0.001,0.01,0.1 suitably to think a unit.
These are only intended to the example clearly expressed, it is believed that the numerical value enumerated between minimum and peak is possible to
Combination is all expressly set forth in the specification in a similar manner.
Unless otherwise indicated, all scopes all include all numerals between end points and end points.It is used together with scope
" about " or " approximate " be suitable for two end points of the scope.Thus, " about 20 to 30 " are intended to covering " about 20 to about
30 ", at least end points including indicating.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describe the term " substantially by ... constitutes " of combination should include determined by element, composition, part or step and reality
There is no other elements, composition, part or the step of the basic novel feature for influenceing the combination in matter.Using term "comprising" or
" comprising " describes the combination of element here, composition, part or step it is also contemplated that basic by these elements, composition, part
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to which illustrate that " can with " include is described any
Attribute is all optional.
Multiple element, composition, part or step can be provided by single integrated component, composition, part or step.It is alternative
Ground, single integrated component, composition, part or step can be divided into multiple element, composition, part or the step of separation.It is used for
The open "a" or "an" for describing element, composition, part or step is not said to exclude other elements, composition, part
Or step.
Each above-mentioned embodiment in this specification is described by the way of progressive, identical between each embodiment
Similar portion is cross-referenced, and what each embodiment was stressed is and other embodiment difference.
The foregoing is only several embodiments of the invention, although disclosed herein embodiment as above, but institute
Content is stated only to facilitate the embodiment for understanding the present invention and using, is not intended to limit the present invention.Any institute of the present invention
Belong to those skilled in the art, do not depart from disclosed herein spirit and scope on the premise of, can be in embodiment
Formal and details on make any modification and change, but the scope of patent protection of the present invention still must be with appended claims
The scope that book is defined is defined.
Claims (15)
1. a kind of recovery method of channeling oil reservoir, it is characterised in that including：
The perforation formation perforated interval of predetermined number is opened up in the position unit length where producing well and injection well are located at oil reservoir；
Inject into well tripping in first tubing string described, tripping in second tubing string and injection string in the producing well, wherein, it is described
Injection string is extended in oil reservoir with predetermined slant；
Air is injected into the oil reservoir of oil reservoir by the first tubing string of injection well and the oil jacket annular space of sleeve pipe formation, and detects described
Product in producing well；
When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；And detect the note
Enter the temperature change of pre-position in well；
When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection steam, by described
Second tubing string in producing well is tentatively recovered the oil；
The air themperature of the injection well exit position is obtained, when the air themperature of the injection well exit position reaches
During two preset temperatures, tripping in igniter is injected into well to described, will be entered under the igniter to unlatching igniter behind the circle of oil reservoir bottom
Row igniting；
Recovered the oil by the second tubing string of the producing well.
2. the method as described in claim 1, it is characterised in that the determination formula of perforation number in the perforated interval unit length
For：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit be hole/
Rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
3. the method as described in claim 1, it is characterised in that before the igniter is lighted a fire, methods described also includes：
Oil pressure is obtained, when the oil pressure is more than default oil pressure, is recovered the oil by the first tubing string of the injection well；
After the oil pressure is less than default oil pressure, the first tubing string of the injection well stops production, and passes through the injection well
First tubing string injects the gas of scheduled duration.
4. the method as described in claim 1, it is characterised in that methods described also includes：Closed to the first of the injection well
After the gas of note injection scheduled duration, the power of the igniter is improved.
5. a kind of ignition method of channeling oil reservoir, it is characterised in that including：
Air is injected into the oil reservoir of oil reservoir by the first tubing string and the oil jacket annular space of sleeve pipe formation of injection well, and detects production
Product in well；
When detect there is tail gas in the producing well when, steam is injected by the injection string of producing well；And detect the note
Enter the temperature change of pre-position in well；
When the temperature of pre-position in the injection well rises to the first preset temperature, stop injection steam, by described
Second tubing string in producing well starts production；
The air themperature of the injection well exit position is obtained, when the outlet temperature reaches the second preset temperature, to institute
State and inject into well tripping in igniter, will be lighted a fire under the igniter to unlatching igniter behind the circle of oil reservoir bottom.
6. method as claimed in claim 5, it is characterised in that the first tubing string by injection well is into the oil reservoir of oil reservoir
It is every meter of side of marking of core intersection 500 to inject the injection intensity of air, and is passed with the intensity of the every meter of side of marking of core intersection 50/moon
Increase.
7. method as claimed in claim 5, it is characterised in that the oil reservoir includes multiple oil reservoirs, wherein positioned at topmost
Oil reservoir is top oil reservoir, and precalculated position includes in the injection well：The top oil reservoir and permeability are more than the oil reservoir of predetermined value.
8. method as claimed in claim 7, it is characterised in that first preset temperature is 250 degrees Celsius to 300 Celsius
Degree.
9. method as claimed in claim 5, it is characterised in that the oil reservoir includes multiple oil reservoirs, wherein positioned at foot
Oil reservoir is bottom oil layer, and the injection well outlet port is located in the bottom oil layer depth bounds.
10. method as claimed in claim 9, it is characterised in that second preset temperature is more than 400 degrees Celsius.
11. method as claimed in claim 5, it is characterised in that the oil reservoir includes multiple oil reservoirs, in each oil reservoir
Position, the first tubing string, second tubing string are provided with perforated interval in the position where oil reservoir, and it is close that the perforated interval is located at oil reservoir
In the predetermined thickness range of bottom.
12. method as claimed in claim 11, it is characterised in that perforation is several in the unit length of each perforated interval
According to average perforation number and unit in the current permeability of the corresponding oil reservoir of perforated interval, the mean permeability of oil reservoir, unit length
Theoretical perforation number is determined in length.
13. method as claimed in claim 12, it is characterised in that the determination formula of described every meter of perforation number of perforated interval is：
N=N0- (A-A0)/(A0/N0)
Wherein, N represents every meter of perforation number of perforated interval, and unit is hole/rice；N0 represents every meter of average perforation number, unit be hole/
Rice；A represents the current permeability of oil reservoir, and unit is darcy；A0 represents the mean permeability of oil reservoir, and unit is darcy.
14. method as claimed in claim 5, it is characterised in that before the igniter is lighted a fire, methods described is also wrapped
Include：
Oil pressure is obtained, when the oil pressure is more than default oil pressure, is recovered the oil by the first tubing string of the injection well；
After the oil pressure is less than default oil pressure, the first tubing string of the injection well stops production, and passes through the injection well
First tubing string injects the gas of scheduled duration.
15. method as claimed in claim 14, it is characterised in that methods described also includes：To the first of the injection well
After the gas of concern injection scheduled duration, the power of the igniter is improved.
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