CN110029976A - A kind of hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system and method - Google Patents
A kind of hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system and method Download PDFInfo
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- CN110029976A CN110029976A CN201910329003.2A CN201910329003A CN110029976A CN 110029976 A CN110029976 A CN 110029976A CN 201910329003 A CN201910329003 A CN 201910329003A CN 110029976 A CN110029976 A CN 110029976A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B43/14—Obtaining from a multiple-zone well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
Abstract
The present invention relates to heavy crude heat extraction technical field, a kind of hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system and method are disclosed.The system includes steam generation facility, membrane separation device, production tree, cementing concrete ring, casing, oil pipe and packer；Oil pipe is set in casing, and oil jacket annulus region is formed between oil pipe and casing；Casing is set in cementing concrete ring, is closely connect on the inside of outside of sleeve and cementing concrete ring；One end of casing and oil pipe is fixedly connected with production tree, and the other end is inserted into oil reservoir；Casing is being formed with well-case perforating interval close to top of oil horizon, and oil pipe is being equipped with oil pipe perforated zone close to oil reservoir bottom, is being equipped with packer in the oil jacket annulus region between two perforated zones；Steam generation facility institute producing steam injects oil pipe through production tree；Oxygen and nitrogen from membrane separation device inject oil jacket annulus region to steam generation facility and through production tree respectively.System of the present invention improves the thermal efficiency of steam, improves thick oil recovery ratio.
Description
Technical field
The present invention relates to heavy crude heat extraction technical fields, and in particular to a kind of hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil recovery
System and method.
Background technique
Increasingly developed with global economy, the world increases the demand of petroleum rapidly.The ground of current viscous crude in the world
Matter reserves are about 6.3 × 1012Bbl occupies biggish ratio in World's Oil and Gas Resources.Viscous crude, i.e. high viscosity heavy crude lead to
It is often called pitch or heavy oil, outstanding feature is that resin and asphalt content is high, and wax content is less, thus viscosity of thickened oil is very
It is high.Under reservoir conditions, viscous crude filtrational resistance is big, flow difficulties, and development difficulty is larger.And China's viscous crude resource distribution is extensive,
Land viscous crude resource accounts for about 20% or more of petroleum resources total amount, predicts that the oil in place that can finally verify is 79.5 × 108T,
Mining resources amount is 19.1 × 108T, oil production rate can be substantially improved by improving thick oil recovery ratio.
Traditional heavy oil production is generally divided into " cold to adopt " and " thermal recovery " two major classes.However there are a considerable amount of heavy crude reservoirs to reach
Less than the cold screening criteria adopted, therefore it is difficult to effectively develop and use.Thermal recovery technology be include steam soak, steam drive and burn oil
The integrated technology of a variety of methods such as layer, wherein based on cyclic steam stimulation method, the heavy oil production that recovers the oil in this way
Account for about the 80% of viscous crude total output.But the shortcomings that cyclic steam stimulation method be through excessive round continuously handle up after, in steam injection process
It is larger along journey heat loss, steam zone is smaller, and due to the heterogeneity on stratum, steam contains along high permeability zone channelling
The increase of water saturation reduces utilization efficiency of heat energy, and stratum energy decline is fast, thus the recovery percent of reserves of steam soak is generally low
In 25%, it is seen that the recovery ratio of steam soak still has biggish room for promotion.
The non-condensation gas such as nitrogen, carbon dioxide and flue gas can be dissolved in crude oil, and then expand crude oil energization, therefore
It is commonly used for assisting thickened oil steam-stimulated, to supplement stratum energy, improves oil recovery factor.CN106640006A discloses one kind
Air injection and carbon dioxide auxiliary steam huff and puff oil recovery method.This method is capable of the casing gas of on-line determination note production well and adjacent well
Oxygen content, operating procedure are followed successively by the gaseous mixture slug for first injecting air and carbon dioxide, are then poured into steam slug, then continuously
Cycle alternation injects gaseous mixture slug and steam slug, until gaseous mixture slug total injection reaches design flow.Due to sky
The main component of gas is nitrogen and oxygen, though on-line determination casing gas oxygen content can reduce the generation probability of accident, operation
Process is complicated and there are some potential safety problemss, may jeopardize site operation safety.And this method is mentioned and is generating has channeling
When, be added profile control agent blocked, but do not illustrate the profile control agent whether high temperature resistant and specific method for implanting, and oil
Most of water in layer cannot be ejected by returning, and stratum heat loss is big, be recovered the oil ineffective.CN103742114A discloses one kind
With furnace steam flue gas mixed water injection oil recovery by heating apparatus and method.This method is produced injection boiler to reduce oil well corrosion rate
Acidic flue gas after flue gas purification device is handled, by flue gas compressor pressurize import meta-alkalescence high-pressure steam pipe, then by
Mixture pipe injects oil well together.But party's subtraction unit is complicated, and evolution separating treatment improves cost of investment, and can not be complete
Oil well etching problem is avoided entirely, and steam condensation mixes brought etching problem with flue gas in injection process, can also when serious
Jeopardize site operation safety.And oil reservoir higher for heterogeneity permeability, corresponding profile control close measure is not taken,
And the main component of flue gas is nitrogen and carbon dioxide, flue gas and steam are easy to produce has channeling, can not play plugging and profile con-trol
Effect, oil recovery effect is unobvious, and then limits this method in the popularization and application of field of heavy oil thermal recovery.
In addition to the above problem, during gas injection body auxiliary steam is handled up, cold injury brought by generally existing injection gas
Evil that is, in gas injection process, since gas own temperature is lower, causes to significantly reduce preamble steam slug temperature in injection process
Degree brings largely heat loss, and then influence the oil recovery of steam soak to influence the development of near wellbore zone steam band
Effect.For similar problems, CN105134151A discloses a kind of hot nitrogen energization Viscosity Reduction And Stimulation.The technique uses hot nitrogen
The nitrogen yield-increasing technique of gas and the injection of thinner slug, point 4 slug injections.Steam is not used in the technique, but it is main
Viscosity reduction is carried out by hot nitrogen and the heat for injecting hot water.The enthalpy for the saturated vapor that temperature is 300 DEG C is 2741KJ/kg, and
Under the pressure of corresponding 300 DEG C of saturated vapors, the enthalpy of hot nitrogen is only 598KJ/kg.As it can be seen that the enthalpy of steam is much larger than hot nitrogen
The enthalpy of gas.Therefore the heat that steam can be transmitted to stratum is much larger than hot nitrogen, and viscosity reduction ability is also above hot nitrogen.
Summary of the invention
The purpose of the invention is to overcome defect and deficiency existing in the prior art, a kind of hot nitrogen auxiliary is provided
Factor of cyclic steam stimulation in heavy oil reservoir oil extraction system and method.
To achieve the goals above, one aspect of the present invention provides a kind of hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil recovery
System, the system include steam generation facility, membrane separation device, production tree, cementing concrete ring, casing, oil pipe and packer.
The oil pipe is set in described sleeve pipe, and oil jacket annulus region is formed between the oil pipe and described sleeve pipe；
Described sleeve pipe is set in the cementing concrete ring, and the outside of described sleeve pipe and the inside of the cementing concrete ring closely connect
It connects.
One end of the cementing concrete ring, described sleeve pipe and the oil pipe is fixedly connected with the production tree, and the other end is inserted
Enter oil reservoir.
Described sleeve pipe is being formed with well-case perforating interval close to the top of oil horizon, and the oil pipe is close to the oil reservoir bottom
Portion is equipped with oil pipe perforated zone, in the oil jacket annulus region between described sleeve pipe perforated zone and the oil pipe perforated zone
Equipped with packer.
Steam generation facility institute's producing steam injects the oil pipe via the production tree；From the membrane separation device
Oxygen be delivered to the steam generation facility, the nitrogen from the membrane separation device injects the oil via the production tree
Cover annular region.
Preferably, the system also includes heating devices, and the heating device is used for will be from the membrane separation device
Nitrogen is heated.
Preferably, the system also includes the first booster pumps and the second booster pump, and first booster pump will be for that will come from
The nitrogen of the heating device is pressurized, and is then delivered to the production tree again；Second booster pump will be for that will come from institute
The steam for stating steam generation facility is pressurized, and is then delivered to the production tree again.
Preferably, the system also includes two sleeve valves, described sleeve pipe valve respectively with first booster pump and
The production tree connection.
Preferably, the perforation thickness of described sleeve pipe perforated zone and the oil pipe perforated zone is respectively 3-5m.
The present invention also provides a kind of hot nitrogens to assist factor of cyclic steam stimulation in heavy oil reservoir oil production method, and this method uses aforementioned
System described in meaning one is implemented, comprising the following steps:
(1) packer is set in the oil jacket annulus region, and the packer is in the middle part of the oil reservoir, then
Described sleeve pipe perforated zone and the oil pipe perforated zone are set；
(2) heat injection nitrogen: hot nitrogen is injected in Xiang Suoshu oil jacket annulus region, reaches prime stratum to hot nitrogen injection pressure
1.05-1.15 times of pressure stops gas injection, and monitors described sleeve pipe pressure change；
(3) steam injection is handled up: being injected steam in Xiang Suoshu oil pipe, is then boiled in a covered pot over a slow fire well after 3-5 days, opens the production of oil well open flow；
(4) hot nitrogen is handled up with steam injection: closing oil well and stops extraction, then injects hot nitrogen to the oil jacket annulus region
Gas opens the production of oil well open flow when the bottom pressure persistently increases, when well head extraction fluid is essentially nitrogen, to institute
Oil pipe injection steam is stated, and hot nitrogen is injected to the oil jacket annulus region with 1.1-1.3 times of steam injection rate, passes through inspection
Bottom pressure of logging well controls the stewing well time, then opens the production of oil well open flow again.
Preferably, the temperature of hot nitrogen described in step (2) is not less than 300 DEG C.
Preferably, steam injection also needs nitrogen in detection described sleeve pipe pressure and described sleeve pipe in step (3) during handling up
Temperature opens described sleeve pipe valve and carries out blowout prevention operation when nitrogen temperature is lower than 250 DEG C in described sleeve pipe.
Preferably, when thering is steam and/or condensed water to occur during obvious fluctuation or blowout prevention occurs in described sleeve pipe pressure,
Steam injection is handled up end.
Preferably, in step (4), when well head produced quantity reduces, continue to inject hot nitrogen to the oil jacket annulus region
Then gas injects steam to the oil pipe again, the hot nitrogen for carrying out next one is handled up with steam injection.
In system of the present invention, by the way that the membrane separation device is arranged, using membrane separation technique by the oxygen in air
It is made full use of on demand after gas, nitrogen separation；It is arranged after the heating device heats nitrogen and reinjects oil well, with existing note nitrogen
Air bound thermal technology is compared, and is not only had better heat insulation and preservation effect, is also improved bottom steam dryness, and will not because of not plus
The injection of hot nitrogen leads to biggish temperature difference, avoids the oil pipe and described sleeve pipe and damages under hot and cold alternation effect
It is bad, and after hot nitrogen injection oil reservoir, cold damage will not be brought to oil reservoir, to improve the thermal efficiency of steam.
By setting described sleeve pipe perforated zone and the oil pipe perforated zone, same well demixing injection-production is realized, is made it possible to
Enough by hot nitrogen temperature and pressure change in the oil jacket annulus region, the onlap situation of steam in oil reservoir, Jin Erxuan are monitored
It takes optimal single steam soak to turn hot nitrogen to handle up opportunity with steam injection, reduces the inefficient cycle of steam, improve steam utilization
Efficiency；And plays the role of purging to top of oil horizon heat injection nitrogen by described sleeve pipe perforated zone near wellbore zone, accelerate nearly well
The discharge of area condensed water is conducive to the efficiency of heating- utilization for improving the injected steam of next one；It is gulped down in hot nitrogen with steam injection
During spitting, hot nitrogen and steam are injected in top of oil horizon and the layering of oil reservoir bottom, are able to suppress the effect of steam overlap, and in heat
Nitrogen, which is taken, is conducive to vaporization in hot situation, therefore steam is enabled to transport in the case where keeping higher mass dryness fraction to oil reservoir deep
It moves, further, since the reinforcing mass transfer ability of hot nitrogen increases heat so that steam accelerates to conduct heat to oil reservoir deep migration
Swept volume increases oil recovery factor.
Detailed description of the invention
Fig. 1 is hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system structural schematic diagram of the present invention；
Fig. 2 is steam overlap schematic diagram of handling up for conventional steam；
Fig. 3 be conventional steam handle up more rounds handle up after steam overlap schematic diagram；
Fig. 4 is using steam affected area schematic diagram after the method for the invention production of heavy oil reservoir.
Description of symbols
1 steam generation facility, 2 membrane separation device
3 heating device, 4 first booster pump
5 second booster pump, 6 production tree
7 cementing concrete ring, 8 casing
9 oil pipe, 10 well-case perforating interval
11 packer, 12 oil pipe perforated zone
13 oil reservoir, 14 oil jacket annulus region
15 sleeve valve, 16 steam valve
61 oil well production valves
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The endpoint of disclosed range and any value are not limited to the accurate range or value herein, these ranges or
Value should be understood as comprising the value close to these ranges or value.For numberical range, between the endpoint value of each range, respectively
It can be combined with each other between the endpoint value of a range and individual point value, and individually between point value and obtain one or more
New numberical range, these numberical ranges should be considered as specific open herein.
In the present invention, in the absence of explanation to the contrary, the noun of locality used such as " upper and lower " is typically referred to reference to attached
It is upper and lower shown in figure；" inside and outside " refers to the inside and outside of the profile relative to each component itself.
Fig. 1 is hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system structural schematic diagram of the present invention.Referring to figure
1, which includes steam generation facility 1, membrane separation device 2, production tree 6, cementing concrete ring 7, casing 8, oil pipe 9 and packer
11。
The oil pipe 9 is set in described sleeve pipe 8, and oil jacket annulus area is formed between the oil pipe 9 and described sleeve pipe 8
Domain 14；Described sleeve pipe 8 is set in the cementing concrete ring 7, and the outside of described sleeve pipe 8 and the cementing concrete ring 7 is interior
Side closely connects.
One end of the cementing concrete ring 7, described sleeve pipe 8 and the oil pipe 9 is fixedly connected with the production tree 6, another
In end insertion oil reservoir 13.
Described sleeve pipe 8 is being formed with well-case perforating interval 10 at the top of the oil reservoir 13, and the oil pipe 9 is close to described
13 bottom of oil reservoir is equipped with oil pipe perforated zone 12, described between described sleeve pipe perforated zone 10 and the oil pipe perforated zone 12
Packer 11 is equipped in oil jacket annulus region 14.
1 producing steam of the steam generation facility injects the oil pipe 9 via the production tree 6；From the UF membrane
The oxygen of device 2 is delivered to the steam generation facility 1, and the nitrogen from the membrane separation device 2 is via 6 note of production tree
Enter the oil jacket annulus region 14.
In system of the present invention, by the way that the membrane separation device 2 is arranged, using membrane separation technique by the oxygen in air
It is made full use of on demand after gas, nitrogen separation；It is arranged after the heating device 3 heats nitrogen and reinjects oil well, with existing note
Nitrogen-gas heat-insulating technique is compared, and is not only had better heat insulation and preservation effect, is also improved bottom steam dryness, and will not be because of not
The injection of heated nitrogen leads to biggish temperature difference, avoids the oil pipe 9 and described sleeve pipe 8 and issues in hot and cold alternation effect
Raw damage, and after the hot nitrogen injection oil reservoir 13, cold damage will not be brought to the oil reservoir 13, to be conducive to improve steam
The thermal efficiency.
By the way that the packer 11 is arranged in the oil jacket annulus region 14, the setting of the packer 11 is deep-controlled
At the middle part of the oil reservoir 13, perforation then is carried out to described sleeve pipe 8 in the top position of the oil reservoir 13 and forms described sleeve pipe
Perforated zone 10 carries out perforation to the oil pipe 9 in the bottom position of the oil reservoir 13 and forms the oil pipe perforated zone 12, from
And the flowing space being connected at the top of the oil jacket annulus region 14 and the oil reservoir 13 is formd, the oil pipe 9 and the oil
The flowing space that 13 bottom of layer are connected makes two flowing spaces respectively independent, does not connect mutually by the way that the packer 11 is arranged
It is logical, same well demixing injection-production is realized, is made it possible to through hot nitrogen temperature and pressure change in the oil jacket annulus region 14, prison
When surveying the onlap situation of steam in the oil reservoir 13, and then choosing optimal single steam soak and turn hot nitrogen and handle up with steam injection
Machine reduces the inefficient cycle of steam, improves steam utilization efficiency；And it is pushed up by described sleeve pipe perforated zone 10 to the oil reservoir 13
Heat injection nitrogen in portion's plays the role of purging near wellbore zone, accelerates the discharge of near wellbore zone condensed water, is conducive to improve next one
The efficiency of heating- utilization of injected steam；During hot nitrogen is handled up with steam injection, 13 top of oil reservoir and the oil reservoir 13
Bottom layering injection hot nitrogen and steam can play the role of inhibiting steam overlap, and advantageous in the case where hot nitrogen takes hot situation
In condensing water vapor, therefore enable to steam in the case where keeping higher mass dryness fraction to oil reservoir deep migration, further, due to
The reinforcing effect of mass transmitting of hot nitrogen increases hot swept volume so that steam accelerates to conduct heat to 13 deep migration of oil reservoir.
In a specific embodiment, the steam generation facility 1 is boiler, and the heating device 3 is electric heating dress
Set 3.
Further, the system also includes oil well production valve 61 and steam valve 16, the oil well production valves 61
Number with the steam valve 16 is 2.The oil well production valve 61 is described for controlling whether oil well is produced
Steam valve 16 is used to control the supply of steam.
In the preferred case, the system also includes heating devices 3, and the heating device 3 from the film for that will divide
Nitrogen from device 2 is heated.
It is heated to the nitrogen from the membrane separation device 2 to reinject the oil after 300 DEG C by the heating device 3
Annular region 14 is covered, reinforces heat insulation and preservation effect, to improve bottom steam dryness, and will not be because of the note of non-heated nitrogen
Entering leads to biggish temperature difference, avoids the oil pipe 9 and described sleeve pipe 8 and is damaged under hot and cold alternation effect, and heat
After nitrogen injects the oil reservoir 13, cold damage will not be brought to the oil reservoir 13, to be conducive to improve the thermal efficiency of steam.
In the preferred case, the system also includes the first booster pump 4 and the second booster pump 5, first booster pump 4 is used
It is pressurized in by the nitrogen from the heating device 3, is then delivered to the production tree 6 again；Second booster pump 5 is used
It is pressurized in by the steam from the steam generation facility 1, is then delivered to the production tree 6 again.
In a preferred embodiment, the system also includes two sleeve valves 15, described sleeve pipe valve 15 respectively with
First booster pump 4 and the production tree 6 connect.
When hot nitrogen temperature is reduced to 250 DEG C in the oil jacket annulus region 14, the use of described sleeve pipe valve 15 can be opened
In blowout prevention.
In other embodiments, the number of described sleeve pipe valve 15 is not limited to 2, as long as control nitrogen blowout prevention can be played
The effect of operation and control nitrogen supply (NS), one or more also may be used.
In a preferred embodiment, the perforation thickness of described sleeve pipe perforated zone 10 and the oil pipe perforated zone 12 is each
From for 3-5m.
The present invention also provides a kind of hot nitrogens to assist factor of cyclic steam stimulation in heavy oil reservoir oil production method, and this method uses aforementioned
System described in meaning one is implemented, comprising the following steps:
(1) packer 11 is set in the oil jacket annulus region 14, and the packer 11 is close to the oil reservoir 13
Then described sleeve pipe perforated zone 10 and the oil pipe perforated zone 12 is arranged in middle part；
(2) heat injection nitrogen: hot nitrogen is injected in Xiang Suoshu oil jacket annulus region 14, reaches primitively to hot nitrogen injection pressure
1.05-1.15 times of stressor layer stops gas injection, and monitors 8 pressure change of described sleeve pipe；
(3) steam injection is handled up: being injected steam in Xiang Suoshu oil pipe 9, is then boiled in a covered pot over a slow fire well after 3-5 days, opens the production of oil well open flow；
(4) hot nitrogen is handled up with steam injection: closing oil well and stops extraction, then injects heat to the oil jacket annulus region 14
Nitrogen opens the production of oil well open flow when the bottom pressure persistently increases, when well head extraction fluid is essentially nitrogen, to
The oil pipe 9 injects steam, and injects hot nitrogen to the oil jacket annulus region 14 with 1.1-1.3 times of steam injection rate,
The stewing well time is controlled by detection bottom pressure, then opens the production of oil well open flow again.
Herein, " bottom pressure persistently increases " refers to that identical change is presented in the injection pressure of bottom pressure and hot nitrogen
Change amplitude.
Bottom pressure persistently increases herein typically take place in multiple round steam soaks after, main cause is: multiple
After round steam soak, the steam injected by 13 bottom of oil reservoir can constantly float under the action of steam overlap, to lead
It causes steam from 13 bottom of oil reservoir constantly to involving at the top of the oil reservoir 13, therefore does not reach 13 top of oil reservoir in steam
When region, the hot nitrogen that is injected by the oil jacket annulus region 14 will not channelling to 13 bottom of oil reservoir.When multiple wheels
After secondary steam soak, after steam overlap causes steam to feed through to 13 top of oil reservoir, by 13 top area of oil reservoir and bottom
Portion's regional connectivity, the hot nitrogen injected at this time from the oil jacket annulus region 14 will enter the oil reservoir 13 via the fluid-channeling channel
Bottom, and then enter oil well bottom, cause bottom pressure persistently to increase, and elevation amplitude is related with the injection pressure of hot nitrogen,
Identical amplitude of variation is presented with the injection pressure of hot nitrogen.And gas is produced by monitoring well head, when nitrogen volume fraction exists
Show that steam overlap has been formed when 90% or more.If subsequent take no action to, steam will be always from 13 bottom of oil reservoir
To top onlap, so that the crude oil of 13 bottom of oil reservoir can not be involved, therefore this when needs top persistently to inject hot nitrogen
Gas drives hot nitrogen more to involve bottom oil reservoir, and when being conducive to recover the oil after stewing well condensed water discharge, improve next
The efficiency of heating- utilization of a round.
Herein, " well head extraction fluid is essentially nitrogen " refers to that the volume fraction of nitrogen in well head extraction fluid is
90% or more, preferably 95% or more.
In method of the present invention, by the way that the packer 11, described sleeve pipe perforated zone 10 and the oil is arranged
Pipe perforated zone 12 forms the flowing space being connected at the top of the oil jacket annulus region 14 and the oil reservoir 13, the oil
The flowing space that pipe 9 is connected with 13 bottom of oil reservoir, and the packer 11 makes two flowing spaces respectively independent, mutually
It is not connected to, prevents the mutual channelling of the fluid of two spaces, realize same well layering and adopt note.
In injection process, hot nitrogen is injected into the oil jacket annulus region 14 first, is then injected to the oil pipe 9
Steam and the steam soak extraction for carrying out more rounds, finally carry out hot nitrogen again and handle up with steam injection.In step (2), injection
Hot nitrogen strengthen heat insulation and preservation effect, to improve bottom steam dryness, and will not be because of the note of non-heated nitrogen
Entering leads to biggish temperature difference, avoids the oil pipe 9 and described sleeve pipe 8 and is damaged under hot and cold alternation effect, and heat
After nitrogen injects the oil reservoir 13, cold damage will not be brought to the oil reservoir 13, to improve the thermal efficiency of steam.
Based on same well demixing injection-production technology, make it possible to the temperature change by hot nitrogen in the oil jacket annulus region 14
And the pressure change of described sleeve pipe 8, the onlap situation of steam in the oil reservoir 13 is monitored, and then preferably go out best single steam and gulp down
It spits and turns hot nitrogen and handle up opportunity with steam injection, reduce the inefficient cycle of steam, improve steam utilization efficiency；It is steamed in hot nitrogen with note
During vapour is handled up, due to layering injection hot nitrogen and steam at the top and bottom of the oil reservoir 13, inhibition steam can be played
The effect of onlap, and hot nitrogen carry higher heat in the case where, be conducive to condensing water vapor, thus be able to maintain steam compared with
To 13 deep migration of oil reservoir under conditions of high mass dryness fraction, and since the reinforcing mass transfer ability of nitrogen can speed up steam to described
The heat transfer of 13 deep migration of oil reservoir, improves hot swept volume；Further more, the nitrogen pneumatic jack formed at the top of the oil reservoir 13, in open flow
Low viscosity crude oil extraction after capable of promoting 13 bottom of oil reservoir heated in production process, maintains 13 pressure of oil reservoir；And
It handles up before beginning in the hot nitrogen of next round with steam injection, the injection in advance of hot nitrogen can play near wellbore zone hot nitrogen
The air-blowing effect of sweeping promotes the discharge of near wellbore zone condensed water, improves the efficiency of heating- utilization of next round.
In a preferred embodiment, the temperature of hot nitrogen described in step (2) is not less than 300 DEG C.
The sufficiently high hot nitrogen of temperature can ensure that preferable heat insulation and preservation effect, and can ensure to inject in the next steps
Steam can in the case where keeping higher mass dryness fraction to 13 deep migration of oil reservoir conduct heat, improve the thermal efficiency and benefit of steam
With rate.
In the preferred case, steam injection also needs to detect the pressure of described sleeve pipe 8 and the set during handling up in step (3)
The temperature of nitrogen in pipe 8 opens described sleeve pipe valve 15 and carries out blowout prevention when the temperature of nitrogen in described sleeve pipe 8 is lower than 250 DEG C
Operation.
Specifically, in step (3), will be increased from the steam of the steam generation facility 1 by second booster pump 5
After pressure, 13 bottom of oil reservoir is injected via the oil pipe 9 and the oil pipe perforated zone 12, well is then boiled in a covered pot over a slow fire after 3-5 days, opens
61 open flow of oil well production valve production, wherein in the injection rate Yu step (2) of steam the injection rate of hot nitrogen volume ratio
For 1:(1-1.5).During steam injection is handled up, the cyclic steam stimulation of more rounds can be carried out.Wherein, single-wheel time steam injection
Amount is 1500t-2000t, generally about 4-6 round.
It further,, can when the temperature of hot nitrogen in described sleeve pipe 8 is reduced to 250 DEG C during steam injection is handled up
Described sleeve pipe valve 15 is opened, blowout prevention is carried out, re-injects hot nitrogen, then to ensure hot nitrogen in the oil jacket annulus region 14
The temperature of gas maintains on 250 DEG C.When obvious fluctuation occurs in the pressure of described sleeve pipe 8, i.e. pressure instantaneous rate of change reaches
When positive and negative 5%-10%, or opens described sleeve pipe valve 15 and carry out thering is steam and/or condensed water to go out during hot nitrogen blowout prevention
Now, the steam injection stage of handling up terminates.
In the preferred case, in step (4), when well head produced quantity reduces, continue to the oil jacket annulus region 14
Hot nitrogen is injected, then injects steam to the oil pipe 9 again, the hot nitrogen for carrying out next one is handled up with steam injection.
Fig. 2 is steam overlap schematic diagram of handling up for conventional steam, Fig. 3 be conventional steam handle up more rounds handle up after steam it is super
Cover schematic diagram.Before step (4), when the pressure of described sleeve pipe 8 significantly increases, or even is substantially reduced, i.e. pressure wink
When change rate when reaching positive and negative 5%-10%, illustrate that the steam injected during step (3) steam injection is handled up is super in gravity
It covers under effect, the multicycle constantly floats, and reaches 13 top area of oil reservoir, forms steam overlap as shown in Figure 2 and involve
Region.If continuing steam injection to handle up, it will the common steam overlap channelling problem of current steam soak occur, lead to institute
The generation the case where medium and deep of oil reservoir 13 employs low uneven, recovery ratio and steam inefficient cycle is stated, is formed as shown in Figure 3
Affected area.The onlap situation of steam in the oil reservoir by the pressure change of described sleeve pipe 8, can be thus monitored, and then preferably
It is optimal out hot nitrogen is turned by single steam soak to handle up opportunity with steam injection, the inefficient cycle of steam is reduced, steam benefit is improved
Use efficiency.
In step (4), specifically, it is first shut off the oil well production valve 61 and stops extraction, then pass through the oil
It covers annular region 14 and persistently injects hot nitrogen via described sleeve pipe perforated interval 10, when oil well bottom pressure persistently increases, open
61 open flow of the oil well production valve production, can carry largely via the hot nitrogen that the oil jacket annulus region 14 is injected at this time
The condensed water of 13 bottom of oil reservoir and the low viscosity crude oil not produced increase crude oil produced quantity.Fluid base is produced to well head
When being originally nitrogen, i.e., the volume fraction of nitrogen is 95% or more in extraction fluid, and oil well turns to adopt to infuse, and Xiang Suoshu oil pipe 9 injects
Steam, and hot nitrogen is injected to the oil jacket annulus region 14 with 1.1-1.3 times of steam injection rate, pass through detection shaft bottom pressure
Power controls the stewing well time, i.e., when bottom pressure is 0.9-1.2 times of original formation pressure, boiling in a covered pot over a slow fire the well time is 3-5 days, well to be boiled in a covered pot over a slow fire
After be then turned on the oil well production valve 61 and carry out open flow production.
During oil well turns to adopt to infuse, hot nitrogen is injected in Xiang Suoshu oil jacket annulus region 14, since hot nitrogen temperature is high
In vapor (steam) temperature, thus the thermal insulation function of the hot nitrogen in the oil jacket annulus region 14 significantly can keep shaft bottom to steam
Vapour mass dryness fraction, additionally it is possible to real between hot nitrogen and steam under the action of density variation after realizing hot nitrogen and steam injection stratum
Existing hot nitrogen steams the gravity segregation inhibiting effect of steam so that hot nitrogen is promoted along 13 top of oil reservoir to oil reservoir deep
Vapour is promoted along the middle and lower part of the oil reservoir 13 to oil reservoir deep, to improve the hot sweep area of steam, and in hot nitrogen
It takes in hot migration process, since nitrogen can so as to keep higher diffusion mass transfer rate for a long time there is no condensation
Accelerate the mass transfer rate of steam in the earth formation, improves the thermal efficiency of steam.
During stewing well, due to steam and hot nitrogen by the heat transfer of carrying to the crude oil in the oil reservoir 13, from
And in steam and low viscosity crude oil there are in the case where density variation, steam continues to migrate to the middle and lower part of the oil reservoir 13；And
Although the temperature of nitrogen decreases, but can still keep higher elasticity energy, is enriched in the top of the oil reservoir 13.Stewing well knot
Shu Hou still closes described sleeve pipe valve 15, only opens the oil well production valve 61, carry out extraction operation, in original steaming
Vapour handle up brought by elasticity can and hot nitrogen under the action of nitrogen energization, be conducive to during note low viscosity crude oil and
The extraction of condensed water, so that the heat for being conducive to next stage is transmitted to the oil reservoir 13；When oil well produced amount reduces, for institute
The 50%-70% of 9 maximum stream flow of oil pipe is stated, described sleeve pipe valve 15 is opened, continues to inject heat to the oil jacket annulus region 14
Nitrogen starts to inject steam to 13 bottom of oil reservoir via the oil pipe 9, carry out when bottom hole temperature (BHT) reaches 250-300 DEG C
The hot nitrogen of next round is handled up with steam injection.Wherein, the injection rate of hot nitrogen is the 1.1-1.3 of steam injection rate
Times.
Fig. 4 is using steam affected area schematic diagram after the method for the invention production of heavy oil reservoir.Through excessive round
Hot nitrogen is handled up with steam injection after process, and hot spread effect is preferable, as shown in figure 4, to improve the development degree of crude oil, into
And improve oil recovery factor.
Further, it is suitble to the reservoir condition of the method for the invention exploitation preferred are as follows: oil reservoir is common heavy oil reservoir, ground
Lower viscosity of crude < 104MPas, oil reservoir 13 thickness G T.GT.GT 10m, the remaining oil saturation > 50% make hole as straight well,
Completion mode is perforation completion, and total completion time require it is good, there is no oil pipe 8 described in shaft bottom and described sleeve pipe 8 manage it is outer alter it is logical.
Following embodiment is that the method for the invention uses following hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system
Implement, oil reservoir to be exploited is common heavy oil reservoir, underground crude oil viscosity < 104MPas, the 13 thickness G T.GT.GT 10m of oil reservoir are remained
Excess oil saturation degree > 50%:
Hot nitrogen auxiliary factor of cyclic steam stimulation in heavy oil reservoir oil extraction system include steam generation facility 1, membrane separation device 2,
Heating device 3, the first booster pump 4, the second booster pump 5, production tree 6, cementing concrete ring 7, casing 8, oil pipe 9 and packer 11,
Wherein the steam generation facility 1 is boiler, and the heating device 3 is electric heater unit.The oil pipe 9 is set in described sleeve pipe
In 8, and oil jacket annulus region 14 is formed between the oil pipe 9 and described sleeve pipe 8；Described sleeve pipe 8 is set in the well cementation water
In mud ring 7, and the outside of described sleeve pipe 8 is closely connect with the inside of the cementing concrete ring 7；It is the cementing concrete ring 7, described
One end of casing 8 and the oil pipe 9 is fixedly connected with the production tree 6, and the other end is inserted into the oil reservoir 13.In the oil reservoir
13 top positions carry out perforating job to described sleeve pipe 8, and perforation thickness is 3m~5m, form described sleeve pipe perforated zone 10；?
13 bottom position of oil reservoir carries out perforating job to the oil pipe 9, and perforation thickness is 3m~5m, forms oil pipe perforated zone
12；The envelope is set in the oil jacket annulus region 14 between described sleeve pipe perforated zone 10 and the oil pipe perforated zone 12
Every device 11, the packer 11 is close to the middle part of the oil reservoir 13.Air obtains nitrogen and oxygen after the separation of membrane separation device 2
Gas, oxygen enter the boiler, auxiliary combustion, to improve efficiency of combustion through air delivering pipeline；Nitrogen is heated through electric heater unit
300 DEG C or more are warming up to, is then pressurized by first booster pump 4, injects the oil jacket annulus area via the production tree 6
In domain 14, and then 13 top area of oil reservoir is injected by described sleeve pipe perforated zone 10；The steam that boiler generates passes through institute
The pressurization of the second booster pump 5 is stated, injects the oil pipe 9 via the production tree 6, and then inject by the oil pipe perforated zone 12
13 bottom section of oil reservoir.
Embodiment 1
It is as follows specifically to open stages of mining for production of heavy oil reservoir:
(1) packer 11 is set in the oil jacket annulus region 14, and the packer 11 is close to the oil reservoir 13
Then middle part carries out perforating job to described sleeve pipe 8 in 13 top position of oil reservoir, perforation thickness 4m forms the set
Pipe perforated zone 10；Perforating job is carried out to the oil pipe 9 in 13 bottom position of oil reservoir, perforation thickness 4m forms oil
Pipe perforated zone 12.
(2) 300 DEG C of hot nitrogen the heat injection nitrogen stage: will be heated to from the electric heater unit by described the
After the pressurization of one booster pump 4, injected in the oil jacket annulus region 14 via the production tree 6, to the oil jacket annulus region 14
It is interior to continue to be pressurized full of after hot nitrogen, stop note when the injection pressure of well head hot nitrogen reaches 1.1 times of original formation pressure
Gas, and monitor 8 pressure change of described sleeve pipe.
(3) steam injection is handled up the stage: after being pressurized from the steam of the boiler by second booster pump 5, via
The production tree 6 injects the oil pipe 9, and then injects 13 bottom section of oil reservoir by the oil pipe perforated zone 12, then boils in a covered pot over a slow fire
Well 4 days, then the production of oil well open flow is opened, wherein the volume ratio of the injection rate of hot nitrogen is in the injection rate with step (2) of steam
1:1.5.Single-wheel time steam injection is 2000t, carries out the cyclic steam stimulation of 6 rounds.
Detect the temperature of nitrogen in the pressure and described sleeve pipe 8 of described sleeve pipe 8.When the temperature of hot nitrogen in described sleeve pipe 8
When being reduced to 250 DEG C, described sleeve pipe valve 15 is opened, blowout prevention is carried out, re-injects hot nitrogen, then to ensure the oil jacket ring
The temperature of hot nitrogen maintains on 250 DEG C in empty region 14.When the pressure instantaneous rate of change of described sleeve pipe 8 reaches 8%, or
Person opens described sleeve pipe valve 15 and carries out during hot nitrogen blowout prevention when having steam and/or condensed water to occur, and steam injection is handled up rank
Section terminates.
(4) hot nitrogen is handled up the stage with steam injection: closing oil well and stops extraction, then passes through the oil jacket annulus region 14
Hot nitrogen is persistently injected via described sleeve pipe perforated interval 10, when the bottom pressure persistently increases, opens the production of oil well open flow.
When well head extraction fluid is essentially nitrogen (volume fraction of nitrogen is 95%), oil well turns to adopt as note, the injection of Xiang Suoshu oil pipe 9
Steam, and hot nitrogen is injected to the oil jacket annulus region 14 with 1.2 times of steam injection rate, when bottom pressure reaches original
It at 1.2 times of strata pressure, boils in a covered pot over a slow fire well 4 days, is then then turned on the production of oil well open flow.It is substantially reduced to oil well produced amount, is described
9 maximum stream flow of oil pipe 60% when, open described sleeve pipe valve 15, continue to the oil jacket annulus region 14 inject hot nitrogen,
Reach 290 DEG C to bottom hole temperature (BHT), injects steam to 13 bottom of oil reservoir via the oil pipe 9, carry out the heat of next round
Nitrogen is handled up with steam injection.Wherein, the injection rate of hot nitrogen is 1.3 times of steam injection rate.
Embodiment 2
It is as follows specifically to open stages of mining for production of heavy oil reservoir:
(1) packer 11 is set in the oil jacket annulus region 14, and the packer 11 is close to the oil reservoir 13
Then middle part carries out perforating job to described sleeve pipe 8 in 13 top position of oil reservoir, perforation thickness 5m forms the set
Pipe perforated zone 10；Perforating job is carried out to the oil pipe 9 in 13 bottom position of oil reservoir, perforation thickness 5m forms oil
Pipe perforated zone 12.
(2) 300 DEG C of hot nitrogen the heat injection nitrogen stage: will be heated to from the electric heater unit by described the
After the pressurization of one booster pump 4, injected in the oil jacket annulus region 14 via the production tree 6, to the oil jacket annulus region 14
It is interior full of after hot nitrogen, continue to be pressurized, the stopping when injection pressure of well head hot nitrogen reaches 1.15 times of original formation pressure
Gas injection, and monitor 8 pressure change of described sleeve pipe.
(3) steam injection is handled up the stage: after being pressurized from the steam of the boiler by second booster pump 5, via
The production tree 6 injects the oil pipe 9, and then injects 13 bottom section of oil reservoir by the oil pipe perforated zone 12, then boils in a covered pot over a slow fire
Well 5 days, then the production of oil well open flow is opened, wherein the volume ratio of the injection rate of hot nitrogen is in the injection rate with step (2) of steam
1:1.3.Wherein, single-wheel time steam injection is 1800t, carries out the cyclic steam stimulation of 5 rounds.
Detect the temperature of nitrogen in the pressure and described sleeve pipe 8 of described sleeve pipe 8.When the temperature of hot nitrogen in described sleeve pipe 8
When being reduced to 250 DEG C, described sleeve pipe valve 15 is opened, blowout prevention is carried out, re-injects hot nitrogen, then to ensure the oil jacket ring
The temperature of hot nitrogen maintains on 250 DEG C in empty region 14.When the pressure instantaneous rate of change of described sleeve pipe 8 reaches 10%,
Or open described sleeve pipe valve 15 and carry out during hot nitrogen blowout prevention when thering is steam and/or condensed water to occur, steam injection is handled up
Stage terminates.
(4) hot nitrogen is handled up the stage with steam injection: closing oil well and stops extraction, then passes through the oil jacket annulus region 14
Hot nitrogen is persistently injected via described sleeve pipe perforated interval 10, when the bottom pressure persistently increases, opens the production of oil well open flow.
When well head extraction fluid is essentially nitrogen (volume fraction of nitrogen is 95%), oil well turns to adopt as note, the injection of Xiang Suoshu oil pipe 9
Steam, and hot nitrogen is injected to the oil jacket annulus region 14 with 1.3 times of steam injection rate, when bottom pressure reaches original
It at 1.1 times of strata pressure, boils in a covered pot over a slow fire well 5 days, is then then turned on the production of oil well open flow.It is reduced to oil well produced amount, is the oil pipe 9
Maximum stream flow 70% when, open described sleeve pipe valve 15, continue to the oil jacket annulus region 14 inject hot nitrogen, to shaft bottom
Temperature reaches 300 DEG C, injects steam to 13 bottom of oil reservoir via the oil pipe 9, carries out the hot nitrogen companion of next round
Steam injection is handled up.Wherein, the injection rate of hot nitrogen is 1.2 times of steam injection rate.
Embodiment 3
It is as follows specifically to open stages of mining for production of heavy oil reservoir:
(1) packer 11 is set in the oil jacket annulus region 14, and the packer 11 is close to the oil reservoir 13
Then middle part carries out perforating job to described sleeve pipe 8 in 13 top position of oil reservoir, perforation thickness 3m forms the set
Pipe perforated zone 10；Perforating job is carried out to the oil pipe 9 in 13 bottom position of oil reservoir, perforation thickness 3m forms oil
Pipe perforated zone 12.
(2) 300 DEG C of hot nitrogen the heat injection nitrogen stage: will be heated to from the electric heater unit by described the
After the pressurization of one booster pump 4, injected in the oil jacket annulus region 14 via the production tree 6, to the oil jacket annulus region 14
It is interior full of after hot nitrogen, continue to be pressurized, the stopping when injection pressure of well head hot nitrogen reaches 1.05 times of original formation pressure
Gas injection, and monitor 8 pressure change of described sleeve pipe.
(3) steam injection is handled up the stage: after being pressurized from the steam of the boiler by second booster pump 5, via
The production tree 6 injects the oil pipe 9, and then injects 13 bottom section of oil reservoir by the oil pipe perforated zone 12, then boils in a covered pot over a slow fire
Well 3 days, then the production of oil well open flow is opened, wherein the volume ratio of the injection rate of hot nitrogen is in the injection rate with step (2) of steam
1:1.Wherein, single-wheel time steam injection is 1500t, carries out the cyclic steam stimulation of 4 rounds.
Detect the temperature of nitrogen in the pressure and described sleeve pipe 8 of described sleeve pipe 8.When the temperature of hot nitrogen in described sleeve pipe 8
When being reduced to 250 DEG C, described sleeve pipe valve 15 is opened, blowout prevention is carried out, re-injects hot nitrogen, then to ensure the oil jacket ring
The temperature of hot nitrogen maintains on 250 DEG C in empty region 14.When the pressure change rate of described sleeve pipe 8 reaches 5%, Huo Zhekai
It opens described sleeve pipe valve 15 to carry out during hot nitrogen blowout prevention when thering is steam and/or condensed water to occur, steam injection is handled up stage knot
Beam.
(4) hot nitrogen is handled up the stage with steam injection: closing oil well and stops extraction, then passes through the oil jacket annulus region 14
Hot nitrogen is persistently injected via described sleeve pipe perforated interval 10, when the bottom pressure persistently increases, opens the production of oil well open flow.
When well head extraction fluid is essentially nitrogen (volume fraction of nitrogen is 95%), oil well turns to adopt as note, the injection of Xiang Suoshu oil pipe 9
Steam, and hot nitrogen is injected to the oil jacket annulus region 14 with 1.1 times of steam injection rate, when bottom pressure reaches original
It at 0.9 times of strata pressure, boils in a covered pot over a slow fire well 3 days, is then then turned on the production of oil well open flow.It is substantially reduced to oil well produced amount, is described
9 maximum stream flow of oil pipe 50% when, open described sleeve pipe valve 15, continue to the oil jacket annulus region 14 inject hot nitrogen,
Reach 250 DEG C to bottom hole temperature (BHT), injects steam to 13 bottom of oil reservoir via the oil pipe 9, carry out the heat of next round
Nitrogen is handled up with steam injection.Wherein, the injection rate of hot nitrogen is 1.1 times of steam injection rate.
Test case
After thickened oil recovery, the oil recovery factor of embodiment 1-3 is calculated, the results are shown in Table 1:
Table 1
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Recovery ratio | 42% | 38% | 37% |
The method of the invention implements thickened oil recovery using system of the present invention, improves the thermal efficiency of steam, avoids
It is damaged in nitrogen injection process to oil reservoir bring cold damage and casing and oil pipe, improves thick under hot and cold alternation
The recovery ratio of oily crude oil.
The preferred embodiment of the present invention has been described above in detail, and still, the present invention is not limited thereto.In skill of the invention
In art conception range, can with various simple variants of the technical solution of the present invention are made, including each technical characteristic with it is any its
Its suitable method is combined, and it should also be regarded as the disclosure of the present invention for these simple variants and combination, is belonged to
Protection scope of the present invention.
Claims (10)
1. a kind of hot nitrogen assists factor of cyclic steam stimulation in heavy oil reservoir oil extraction system, which is characterized in that the system includes steam generation dress
Set (1), membrane separation device (2), production tree (6), cementing concrete ring (7), casing (8), oil pipe (9) and packer (11)；
The oil pipe (9) is set in described sleeve pipe (8), and is formed with oil jacket ring between the oil pipe (9) and described sleeve pipe (8)
Empty region (14)；Described sleeve pipe (8) is set in the cementing concrete ring (7), and the outside of described sleeve pipe (8) and the well cementation
The inside of cement sheath (7) closely connects；
One end of the cementing concrete ring (7), described sleeve pipe (8) and the oil pipe (9) is fixedly connected with the production tree (6),
The other end is inserted into oil reservoir (13)；
Described sleeve pipe (8) is formed with well-case perforating interval (10) at the top of the oil reservoir (13), and the oil pipe (9) is close
Oil reservoir (13) bottom is equipped with oil pipe perforated zone (12), described sleeve pipe perforated zone (10) and the oil pipe perforated zone
(12) packer (11) are equipped in the oil jacket annulus region (14) between；
Steam generation facility (1) institute's producing steam injects the oil pipe (9) via the production tree (6)；From the film point
Oxygen from device (2) is delivered to the steam generation facility (1), and the nitrogen from the membrane separation device (2) is via described
Production tree (6) injects the oil jacket annulus region (14).
2. system according to claim 1, which is characterized in that the system also includes heating device (3), the heating dress
(3) are set for heating the nitrogen from the membrane separation device (2).
3. system according to claim 1, which is characterized in that the system also includes the first booster pumps (4) and second to increase
Press pump (5), first booster pump (4) are used to for the nitrogen from the heating device (3) being pressurized, then be delivered to again
The production tree (6)；Second booster pump (5) is used to for the steam from the steam generation facility (1) being pressurized, so
It is delivered to the production tree (6) again afterwards.
4. system according to claim 1, which is characterized in that described the system also includes two sleeve valves (15)
Sleeve valve (15) is connect with first booster pump (4) and the production tree (6) respectively.
5. system according to claim 1, which is characterized in that described sleeve pipe perforated zone (10) and the oil pipe perforation layer
The perforation thickness of section (12) is respectively 3-5m.
6. a kind of hot nitrogen assists factor of cyclic steam stimulation in heavy oil reservoir oil production method, which is characterized in that this method uses claim 1-5
Any one of described in system implement, comprising the following steps:
(1) the setting packer (11) in the oil jacket annulus region (14), the packer (11) is close to the oil reservoir
(13) then described sleeve pipe perforated zone (10) and the oil pipe perforated zone (12) is arranged in middle part；
(2) heat injection nitrogen: hot nitrogen is injected in Xiang Suoshu oil jacket annulus region (14), reaches prime stratum to hot nitrogen injection pressure
1.05-1.15 times of pressure stops gas injection, and monitors described sleeve pipe (8) pressure change；
(3) steam injection is handled up: being injected steam in Xiang Suoshu oil pipe (9), is then boiled in a covered pot over a slow fire well after 3-5 days, opens the production of oil well open flow；
(4) hot nitrogen is handled up with steam injection: closing oil well and stops extraction, then injects hot nitrogen to the oil jacket annulus region (14)
Gas opens the production of oil well open flow when the bottom pressure persistently increases, when well head extraction fluid is essentially nitrogen, to institute
Oil pipe (9) injection steam is stated, and hot nitrogen is injected to the oil jacket annulus region (14) with 1.1-1.3 times of steam injection rate
Gas controls the stewing well time by detection bottom pressure, then opens the production of oil well open flow again.
7. according to the method described in claim 6, it is characterized in that, the temperature of hot nitrogen described in step (2) is not less than 300
℃。
8. according to the method described in claim 6, it is characterized in that, in step (3) steam injection handle up during also need detection institute
Casing (8) pressure and described sleeve pipe (8) interior nitrogen temperature are stated, when described sleeve pipe (8) interior nitrogen temperature is lower than 250 DEG C, is opened
Described sleeve pipe valve (15) carries out blowout prevention operation.
9. the method according to claim 6 or 8, which is characterized in that obvious fluctuation occur to described sleeve pipe (8) pressure or prevent
During spray when having steam and/or condensed water to occur, steam injection is handled up end.
10. according to the method described in claim 6, it is characterized in that, when well head produced quantity reduces, continuing in step (4)
Hot nitrogen is injected to the oil jacket annulus region (14), then steam is injected to the oil pipe (9) again, carries out the heat of next one
Nitrogen is handled up with steam injection.
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