CN106246153A - A kind of method of pressure break auxiliary heavy crude producing after combustion soaking - Google Patents
A kind of method of pressure break auxiliary heavy crude producing after combustion soaking Download PDFInfo
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- CN106246153A CN106246153A CN201610785198.8A CN201610785198A CN106246153A CN 106246153 A CN106246153 A CN 106246153A CN 201610785198 A CN201610785198 A CN 201610785198A CN 106246153 A CN106246153 A CN 106246153A
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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
- E21B43/243—Combustion in situ
- E21B43/247—Combustion in situ in association with fracturing processes or crevice forming processes
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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
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
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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
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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Abstract
A kind of method that after the invention discloses combustion soaking, pressure break assists heavy crude producing, the method comprising the steps of: (1) selectes combustion soaking well heavy crude reservoir, and oil well oil reservoir is lighted by point of application ignition technique；(2) in oil well, air or oxygen rich gas are injected, accumulative injection rate 20～150 × 104m3, stop gas injection；(3) implementing pressure break, fracture length exceedes coke zone；(4) noble gas, the most vexed well 5～10 days are injected；(5) opening well and making production.The present invention solves, by fracturing process, the problem that combustion soaking exploitation process Crude Oil increases through oil wall, coke zone, combustion zone, burned region filtrational resistance, the crude oil that can make heating migrates to pit shaft extraction in time, it is possible to effectively play the advantage in terms of improving super deep-layer heavy crude single well productivity and economic benefit.
Description
Technical field
The invention belongs to field of oil development, a kind of method that after being specifically related to combustion soaking, pressure break assists heavy crude producing.
Background technology
China's heavy oil development mode mainly includes steam soak (accounting for 78%) at present, and steam drives (accounting for 10%) and routine
Water drive (accounts for 10%), and these development scheme techniques are simple, and recovery ratio is higher, is suitable for buried depth shallower (less than 1000m)
Heavy crude reservoir.And for burying the deep oil reservoir of (more than 1500m), water-sensitivity damage, alternate thin beds reservoir etc., due to steam injection heat waste
The problems such as mistake rate is big, steam injection pressure is big, use steam injection technology to be difficult to effective exploitation, and this kind of oil reservoir is general it is contemplated that use and burn
Technique for oil formation (include combustion in situ handle up, combustion in situ displacement, belong to combustion (of oil) insitu heat) exploitation, wherein combustion in situ is handled up
Technology has advantage and the potentiality of uniqueness.
Combustion in situ handle up crude oil extraction include injecting, stewing well, back production three phases.In the stage of injection, use electric heating point
The firing technique such as fire, chemic ignition or spontaneous ignition, is heated to more than crude oil burning-point by oil reservoir, utilizes in oil reservoir one of crude oil
Divide heavy ingredient to make fuel combustion heat, in oil reservoir, be continuously injected into air with air compressor, the crude oil of near wellbore zone simultaneously
Burning produces heat and generates flue gas, and layer radially advances and diffusion, heating in crude oil peripherally so that it is viscosity reduces；Stewing
In the well stage, stopping air and inject and closing well, make non-condensing gas continue diffusion and dissolve, heat transmits to depth, and crude oil enters one
Step heating, viscosity reducing；At recovery phase, again drive a well, former in oil reservoir under the multiple action mechanism such as heating, viscosity reducing, dissolved gas drive
Oil, injection gas and flue gas extraction from oil well.Wherein, at the end of combustion in situ air injection, can to oil reservoir far-end from gas injection well
To be divided into burned region, combustion zone, coke zone, steam zone, oil wall and 6, original oil district zone (seeing Fig. 1).At burned region
In, region the most burned after combustion zone, rock core is hardly visible crude oil, rock core hole is satisfied by injecting air
With, when air injection, owing to air filtrational resistance in porous media is the least, the pressure in this regional air chamber basic with
Gas injection well bottom pressure keeps consistent, and barometric gradient is the least；But in exploitation process, it is liquid purging process, Jamin effect can be formed
Increase filtrational resistance, be unfavorable for the smooth back production of crude oil.Combustion zone is the main region that high-temperature oxydation reaction (burning) occurs, at this
Region internal oxidition reaction is the most violent, and Oxygen saturation declines rapidly, and the mean temperature in this region is the highest, the temperature of zone boundary
Change is the most violent, and thermograde is maximum.During vexed well, the air in burned region due to do not have crude oil participate in oxidation reaction,
It is implantation concentration in this district's oxygen concentration.Crude oil all by displacement to oil reservoir far-end, is filled with air in oil reservoir hole.Stop note
After gas stewing well, the air in burned region cannot continue to be completely consumed, simultaneously because can send out for QI-insufficiency oil reservoir combustion zone
Raw low-temperature oxidation, causes viscosity of crude to increase and reservoir permeability reduces.Coke zone, in one little scope of combustion zone leading edge,
Having coking phenomenon, the rock core after fire extinguishing presents firm lump in the range of this.This part provides fuel for fireflood process, sends out
The raw oxidation reaction in this region is mainly low-temperature oxidation reaction；In process of in-situ combustion, this regional temperature is only second to combustion
Burning band, owing to temperature is higher, exist almost without liquid phase in this region, only exist gas phase and solid phase, it is solid that solid phase refers to that surface has
The rock particles that state carbonizing matter sticks, gas phase refers to by the N in air2, oil stability generate hydrocarbon gas, irreducible water
The water vapour of evaporation formation, the water vapour of burning generation, CO, CO2Composition.Owing to there is no liquid phase, during air injection, this
Part is not substantially formed obvious pressure drop in process of in-situ combustion owing to coke zone is the thinnest, but in exploitation process, infiltration
Rate is lost in 30%～60%, substantially increases filtrational resistance.Steam zone, between coke zone and oil wall, mainly by high temperature
Water vapour, the water vapour of burning generation and the part light crude oil that irreducible water evaporation is formed meets the steam of cold solidifying formation
Band.Oil wall, the light crude oil being mainly composed of Pintsch process generation of the oily wall before coke zone, mix and do not occur substantially
The prime stratum crude oil of chemical change, also comprises the nitrogen in the water of burning generation, carbon dioxide, air, due to this district
Territory oil saturation is high, and gas saturation is relatively low, has bigger filtrational resistance, also exists relatively equally in exploitation process
Big filtrational resistance.Therefore, in time crude oil near the oily wall of heating is quickly migrated to pit shaft, be the key of combustion soaking.
CN101161987A discloses the Technology of a kind of combustion soaking heavy crude producing, and description is combustion soaking exploitation
Air injection igniting in technology, stewing well and oil recovery stage technique parameter and feature.The prior art fails to solve in exploitation process each
The filtrational resistance problem that individual zone is increased, the crude oil of heating can not migrate to extraction after pit shaft in time, and production efficiency is low.
CN104265257A discloses the combustion in situ huff and puff oil recovery side of a kind of fracturing propping agents filling auxiliary catalysis igniting
Method, is wherein first to carry out pressure break and with catalyst granules and proppant pack crack, carries out combustion soaking, its main purpose afterwards
It is igniter catalyst to be migrated in advance stratum, expands swept volume, reach augmented injection effect, improve ignition success rate.This is existing
Technology does not consider how to break through coke zone, does not provides the technology enlightenment how solving filtrational resistance increase problem yet.
To sum up, the recovery method of prior art can not fundamentally solve filtrational resistance increase in combustion soaking exploitation process
Problem.
Summary of the invention
The method that it is an object of the present invention to develop the combustion soaking heavy crude producing of a kind of improvement, gulps down solving baked wheaten cake
Tell the problem that exploitation process Crude Oil increases through oil wall, coke zone, combustion zone, burned region filtrational resistance.
In the present invention mainly by fracturing process solve combustion soaking exploitation process Crude Oil through oil wall, coke zone,
The problem that combustion zone, burned region filtrational resistance increase.Specifically, after the invention provides a kind of combustion soaking, pressure break auxiliary is opened
The method adopting viscous crude, the method comprising the steps of:
(1) selected combustion soaking well heavy crude reservoir, oil well oil reservoir is lighted by point of application ignition technique；
(2) injecting air or oxygen rich gas in oil well, after lighting a fire successfully, accumulative gas injection rate is 20～150 × 104m3, stop
Only gas injection；
(3) implementing pressure break, fracture length exceedes coke zone；
(4) noble gas, the most vexed well 5～10 days are injected；
(5) opening well and making production.
In the method for the present invention, implement pressure break auxiliary heavy crude producing after utilizing combustion soaking, can effectively solve combustion soaking
The problem that exploitation process Crude Oil increases through oil wall, coke zone, combustion zone, burned region filtrational resistance, it is possible to make the former of heating
Oil migrates to pit shaft extraction in time, it is possible to effectively play in terms of improving super deep-layer heavy crude single well productivity and economic benefit is excellent
Gesture.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
Described heavy crude reservoir can be the degree of depth heavy crude reservoir less than 3500m.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
The heavy crude reservoir selected meets condition: reservoir depth<3500m, remaining oil saturation>0.5, oil reservoir gross thickness>5m, permeability
>50md。
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
Described combustion soaking well can be straight well, it is also possible to for horizontal well or multilateral well.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
Described firing technique can be any technology that oil well oil reservoir can be lighted firing temperature (typically wanting more than 450 DEG C), such as
Electric heater igniting, natural gas fired or spontaneous ignition.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
The speed injecting air or oxygen rich gas in step (2) is 5000m3/ d～35000m3/ d, accumulative gas injection rate is 20～150 ×
104m3, inject oxygen-enriched air according to the proportional conversion of oxygen-enriched content and content of oxygen in air.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
In step (3), pressure break can be fracturing, or gas pressure break.Wherein, described gas pressure break prioritizing selection pressurized carbon dioxide
Split or propane pressure break.In the present invention, by implementing fracturing operation after combustion soaking, it is not only able to form multiple cracking system,
Fracture length requires through coke zone, the most effectively the reduction back production crude oil filtrational resistance by coke zone, and inject two
Carbonoxide or propane can enter stratum and play the effect dissolving viscosity reduction, and viscosity of crude is greatly lowered, and is beneficial to volume increase；Pressure break is propped up
Support agent can use part combustion adjuvant or oxidation catalyst, is second to take turns igniting and prepare.In the present invention, it is desirable to fracture length surpasses
Cross coke zone, namely can drive through big filtrational resistance, be beneficial to crude oil and exploit smoothly.The remarkable result that pressure break can be brought:
One is can to drive through big filtrational resistance, the most smooth in production process；Two is fire retardant can be advanced in stratum, in order to
Igniting success in next one.
According to specific embodiments of the present invention, after the combustion soaking of the present invention in the method for pressure break auxiliary heavy crude producing,
In step (4), noble gas can be nitrogen or inject air quite for carbon dioxide gas, injection rate and air, injection rate
ForWherein folk prescription oil-sand consumed cabin air
Amount can record according to industry standard SY/T6898-2012.The injection of noble gas mainly prevents the back production initial stage from consuming the most completely
Oxygen and crude oil, cracking after the risk of explosion that causes of light oil extraction together with methane.
Inject after noble gas, can vexed well 5～10 days；Just can drive a well in the case of output gas oxygen content is less than 5%
Often produce.
After the combustion soaking of the present invention, the method for pressure break auxiliary heavy crude producing may also include and is repeated in step (1)～(5)
Carry out many rounds handle up exploitation process.
The Advantageous Effects of the present invention:
1) present invention can solve combustion soaking exploitation process Crude Oil through oil wall, coke zone, burning by fracturing process
The problem that band, burned region filtrational resistance increase, it is possible to be that the crude oil heated migrates to pit shaft extraction in time；
2) fracturing fracture is not only able to effectively to reduce this round and handles up filtrational resistance, moreover it is possible to is effectively improved next one and involves
Volume, reaches the purpose of efficient augmented injection volume increase；
3) method of the present invention is applicable to common heavy oil, is also applied for super deep-layer heavy crude, can implement also may be used on straight well
To implement on horizontal well or multilateral well；
4) method of the present invention can be effectively improved the stratum getter capacity of next one, injects sky under equal gas injection pressure
Gas speed can improve 3～6 times, is effectively shortened invalid (not oil-producing) production time；After gas injection speed improves, it is effectively ensured
Combustion zone leading edge is in high-temp combustion state all the time, improves combustion zone peak temperature, makes the crude oil during combustion in situ high
Anneal crack solution modification effect is more significantly；
5) fracturing propping agents can use part combustion adjuvant or oxidation catalyst, under conditions of lighter power is certain,
Lower round is injected air (oxygen-enriched) speed and can be properly increased, and can be effectively improved combustion zone temperature and play and preferably modify effect.
Accompanying drawing explanation
Fig. 1: fireflood is handled up each structural-belt division schematic diagram in ignition process.
Fig. 2 A: under the conditions of existing straight well, combustion in situ is handled up each band expansion schematic diagram in ignition process.Fig. 2 B: burn
Oil reservoir handle up after each band expansion schematic diagram in pressure break heavy crude producing exploitation process.
Fig. 3 A and Fig. 3 B: combustion in situ handle up after in high enegry gas fracturing heavy crude producing exploitation process each band expansion show
It is intended to.
Fig. 4 A and Fig. 4 the B: the second round combustion in situ handle up after in pressure break heavy crude producing exploitation process each band expansion show
It is intended to.
Fig. 5 A and Fig. 5 B: horizontal well combustion in situ handle up after each band expansion signal in pressure break heavy crude producing exploitation process
Figure.
Detailed description of the invention
In order to be illustrated more clearly that the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is described further.This
Skilled person should be appreciated that following specifically described content is illustrative and be not restrictive, and should not limit with this
Protection scope of the present invention.
A kind of method that after the invention provides combustion soaking, pressure break assists heavy crude producing, mainly includes manually splitting
Seam mode solves the combustion in situ of heavy crude reservoir exploitation process Crude Oil of handling up and oozes through oil wall, coke zone, combustion zone, burned region
The problem that flow resistance increases, it is possible to make the crude oil of heating migrate to pit shaft extraction in time, provide for next round augmented injection simultaneously
High bleed-through road, next one getter capacity increases substantially, it is possible to achieve combustion in situ handle up igniting during high speed gas injection, no
Only expand combustion zone and heat front swept volume thereof, the most effectively achieve oil stability modification.Involved in the present invention
Pressure break auxiliary heavy crude producing method after combustion soaking, it is possible to increase substantially cycle cumulative oil production, reach the mesh of increasing yield and injection
, can effectively play the advantage in terms of improving viscous crude single well productivity and economic benefit simultaneously.Fig. 2 A is existing straight well condition
Lower combustion in situ is handled up each band expansion schematic diagram in ignition process.Fig. 2 B is that after combustion in situ is handled up, pressure break heavy crude producing returns
Each band expansion schematic diagram during adopting.It can be seen that combustion zone centered by gas injection well in cylinder to well
Radially advance.By the pressure break of appropriate scale during back production, fracturing fracture breaks through oil wall, coke zone, combustion zone, burned region, is formed
High flow conductivity seepage channel, greatly reduces filtrational resistance so that heating in crude oil quickly migrates to shaft bottom extraction.
Specifically, after the combustion soaking that the present invention provides, the method for pressure break auxiliary heavy crude producing mainly includes step:
(1) point of application ignition technique, lights firing temperature, firing temperature by selected heavy crude reservoir combustion soaking well oil reservoir
Typically want more than 450 DEG C；Wherein, the combustion soaking well heavy crude reservoir selected meets following condition: < 3500m remains reservoir depth
Excess oil saturation > 0.5, oil reservoir gross thickness > 5m, permeability > 50md；Combustion soaking well not only can be straight well but also can be horizontal well
(Fig. 5 A, Fig. 5 B) or multilateral well；
(2) injecting air (or oxygen-enriched) in oil well with air compressor, use electric ignition, injecting air injection rate is
5000m3/ d, after lighting a fire successfully, raises speed step by step to 25000m3/ d, namely accumulative gas injection rate is 20～60 × 104m3；
(3) implement pressure break, can be fracturing can also be gas pressure break (Fig. 3 A, Fig. 3 B, Fig. 4 A, Fig. 4 B), gas
Pressure break can select carbon dioxide pressure break or propane pressure break, is not only able to be formed multiple cracking system, the carbon dioxide of injection or
Propane can enter stratum and play the effect dissolving viscosity reduction, and viscosity of crude is greatly lowered, and is beneficial to volume increase；Pressure break scale regards to be burnt
Handle up depending on extending radius, it is ensured that oil wall has just been broken through in crack, it is ensured that igniting and vexed well stepwise heating crude oil are migrated smoothly
To pit shaft extraction, and second can be improved and take turns stratum getter capacity of handling up, high ventilation air injection can be carried out, be effectively ensured
Combustion zone leading edge is in high-temp combustion state all the time, improves combustion zone peak temperature, makes the crude oil during combustion in situ
Pintsch process modification effect is more significantly；In addition, fracturing propping agents can use part combustion adjuvant or oxidation catalyst, for
Second takes turns igniting prepares；
(4) injecting a certain amount of noble gas, injection rate is
Wherein folk prescription oil-sand
Consumed cabin air amount can record according to industry standard SY/T6898-2012.Inject noble gas can be nitrogen can also be two
Carbonoxide gas, depending on concrete source of the gas situation, nitrogen has expansion, carbon dioxide also to have in addition to having expansion
Have dissolving viscosity reduction effect) after, make near wellbore zone air advance stratum, in order to the oxygen in air vexed well 5～in 10 days more preferably
Oxidation consumption reduce back production security risk, and the raw carbon dioxide of the more preferable heat of consumption of vexed well stage oxygen, play fall
Low viscosity of crude effect；
(5) opening well and making production.
(6) the most several rounds are handled up and are performed step (1)～(5) successively.
Pressure break exploitation common heavy oil after embodiment 1, straight well combustion soaking
Oil reservoir 1 oil reservoir degree of depth 800m；Core intersection 19.6m；Reservoir permeability 610 × 10-3μm2；Reservoir temperature 32 DEG C；Former
Oil viscosity 5100mPa.s；Oil density 0.9240g/cm3；Porosity 35%, oil saturation 58.9%；X1, X2 well is this oil
Hiding 2 mouthfuls of straight well producing wells, have identical reservoir geology feature, conventional cold yield of adopting is less than limiting economic rate.
1) X1, X2 well utilizes electric heater that injection air is heated to more than 450 DEG C, and speed is 5000m3/ d, persistently notes
Enter 4 days and realize igniting；
2) close X1, X2 well point firearm to continue inject air and raise speed step by step to 15000m3/ d, X1 well adds up gas injection
250000m3, X2 well adds up gas injection and can only achieve 270000m3；Zone is as shown in Fig. 3 A zone.
3) X1 well utilizes carbon dioxide pressure break to extrude a plurality of man-made fracture of 10m length, and FRACTURING DESIGN scale 20-40 mesh is made pottery
Grain 22m3, minimum sand ratio 7%, high sand ratio 42%, accumulative fracturing fluid 56m3, liquid carbon dioxide consumption 90m3, many cracks is worn
Crossing coke zone as shown in Figure 3A, this block folk prescription oil-sand consumed cabin air amount is 298m3, X1 well injection pressure 8.5MPa, X2 well is noted
Enter pressure 9.0MPa, inject 24958m3The vexed well of nitrogen；X2 well nitrogen injection 28540m3Rear direct vexed well；
4) stewing well back production after 5 days, X1 well initial stage peak value yield 30t/d, average production per well 18t/d, the cycle tires out yield
2120t.X2 well initial stage peak value yield 9.4t/d, average production per well 5.6t/d, the cycle tires out yield 496t.After using combustion soaking
The X1 well cycle oil recovery effect of pressure break recovery method is substantially better than the X2 well using conventional combustion in situ to handle up.Second takes turns baked wheaten cake gulps down
Tell rear pressure break as shown in Figure 3 B.
After embodiment 2, straight well combustion soaking, pressure break exploitation and pressure break auxiliary combustion soaking enhanced recovery surpass deep-layer heavy crude side
Method contrasts
Oil reservoir 2 degree of depth 2155m, thickness 10.3m, oil reservoir average pore, more than 20%, reaches as high as 29%；Averagely ooze
Rate is 100 × 10 thoroughly-3μm2.Crude oil dissolved gas oil ratio 12.99m3/m3, saturation pressure 4.1MPa, under reservoir condition, viscosity is
500mPa s, when 50 DEG C, stock tank oil viscosity is 20000mPa s.Y1, Y2, Y3 well is that on this oil reservoir, 3 mouthfuls of straight wells produce
Well, has identical reservoir geology feature, and current well yield only has 2.5t/d-3.4t/d.
1) Y3 well utilizes fracturing to extrude 15m man-made fracture, and design scale adds ceramsite propping agent 20-40 mesh 20m3,
Minimum sand ratio 5%, high sand ratio 45%, with companion during proppant with combustion adjuvant 2 tons and high-temperature oxydation catalyst 20kg, wherein
Combustion adjuvant is 5%, and 10% sand added than the stage.Y1, Y2, Y3 well utilizes natural gas fired technology, and injection air is heated to 450
More than DEG C；Initial stage injection rate 5000m3/d-15000m3/ d, accumulative injection air 800000m3.Bottom hole temperature (BHT) monitoring display, Y3
Owing to after adding combustion adjuvant 4 days, temperature rises a height of more than 500 DEG C, and Y1, Y2 well just shows more than 500 DEG C high after 9 days
Temperature, and Y3 injection pressure is less than Y1, Y2 well pressure 4-5MPa, shows that pressure break auxiliary combustion soaking enhanced recovery has injection energy
Power is strong, fast advantage of lighting a fire.After Y3 well is burnt, each zone is distributed as shown in Figure 4 A.
2) any measure do not implemented by Y1 well, and Y2, Y3 well utilizes hydraulic fracturing technology to extrude the long man-made fracture of 15m, adds and props up
Support agent 20m3, with companion's combustion adjuvant during proppant or high-temperature oxydation catalyst.Y3 well man-made fracture is through coke zone such as figure
Shown in 4B.
3) during gas injection, Y1, Y2, Y3 well injection pressure is respectively 21.5MPa, 22MPa, 21.9MPa, this block unit oil-sand
Consumed cabin air amount is 255m3, Y1, Y2, Y3 well is injected separately into carbon dioxide 148300m3、151000m3、151000m3Vexed
Well；
4) well back production after 5 days boiled in a covered pot over a slow fire by Y1, Y2, Y3 well, Y1 well initial stage peak value yield 20t/d, average production per well 12.3t/d,
Cycle tires out yield 1565t；Y2 well initial stage peak value yield 25t/d, average production per well 14.3t/d, the cycle tires out yield 1665t；Y3
Well initial stage peak value yield 45t/d, average production per well 26.3t/d, the cycle tires out yield 2365t.This shows pressure break after combustion soaking
Crude oil extraction can break through high resistant coke zone, has preferable percolation ability, can effectively expand again next round swept volume；And
Pressure break auxiliary combustion soaking can only solve augmented injection, expand swept volume effect, and burning coke zone is can not to be formed by first pressure break
Break through.
Pressure break exploitation common heavy oil after embodiment 3, horizontal well combustion soaking
Oil reservoir 3 oil reservoir degree of depth 600m；Thickness 11.8m；Oil reservoir mean permeability 50 × 10-3μm2；Reservoir temperature 30 DEG C；Ground
Lower viscosity of crude 100mPa.s；Porosity 26%, oil density 0.8590g/cm3；5 mouthfuls of this district water horizontal well, horizontal section length is put down
All 500m, the most aqueous 34%.
1) oil reservoir is lighted a fire by application spontaneous ignition technology, i.e. injects high-temperature steam in oil well, and its temperature is 280
DEG C, ground mass dryness fraction is 100%, and injection pressure reaches 6.5MPa.Noting appropriate air afterwards so that oil reservoir spontaneous combustion, temperature reaches 450 DEG C,
Make bottom hole temperature (BHT) reach 550 DEG C of burnings and about use about 15 days
2) in oil well, air, gas injection speed 8000m are injected with air compressor3/d-35000m3/ d, individual well is accumulative to be injected
Air 1500000m3/d；Each zone such as Fig. 5 A zone distribution after baked wheaten cake.
3) utilizing packer card water shutoff power staged fracturing technology piecemeal to extrude 3 3-5m artificial fracturing cracks, first paragraph adds
20-40 mesh quartz sand 10m3, second segment adds 20-40 mesh quartz sand 8m3, the 3rd section adds 20-40 mesh quartz sand 7m3, three sections add altogether
Enter quartz sand proppant 25m3.Form the distribution of crack and zone as shown in Figure 5A
4) this block folk prescription oil-sand hole consumption is 265m3, inject 95000m3Nitrogen, vexed well 7-10 days, back production；
5) at 3 mouthfuls of well 5 wells of this oil field coprocessing, wherein two mouthfuls of wells have been carried out second and take turns process, two mouthfuls of well first alternate water injections
Entering pressure when being 6.5MPa, air-breathing speed is 5000m3/ d, after after implementing combustion soaking, fracturing technique processes, in order to check injection
Ability, at the end of second takes turns construction soon, has carried out air-breathing test, augmented injection about 8 times under same injection pressure, the most flatly
The highest even augmented injection of well 10 times, the effective time of each well is about 1 year.Output oil proves through assay, and output crude oil glues
/ 3rd of degree average out to prime stratum viscosity of crude, it is achieved that Pintsch process modifies.Second take turns combustion soaking after pressure break such as
Shown in Fig. 5 B.
Claims (10)
1. a method for pressure break auxiliary heavy crude producing after combustion soaking, the method comprising the steps of:
(1) selected combustion soaking well heavy crude reservoir, oil well oil reservoir is lighted by point of application ignition technique；
(2) in oil well, air or oxygen rich gas are injected, accumulative injection rate 20～150 × 104m3Rear stopping gas injection；
(3) implementing pressure break, fracture length exceedes coke zone；
(4) noble gas, the most vexed well 5～10 days are injected；
(5) opening well and making production.
Method the most according to claim 1, wherein, described heavy crude reservoir is the heavy crude reservoir that the degree of depth is less than 3500m.
Method the most according to claim 1, wherein, the heavy crude reservoir selected meets condition: < 3500m remains reservoir depth
Excess oil saturation > 0.5, oil reservoir gross thickness > 5m, permeability > 50md.
Method the most according to claim 1, wherein, described combustion soaking well is straight well, horizontal well or multilateral well.
Method the most according to claim 1, wherein, described firing technique is electric heater igniting, chemic ignition, natural gas point
Fire or spontaneous ignition.
Method the most according to claim 1, wherein, the speed injecting air or oxygen-enriched air in step (2) is 5000m3/d
～35000m3/ d, accumulative gas injection rate is 20～150 × 104m3。
Method the most according to claim 1, wherein, in step (3), pressure break is fracturing or gas pressure break, described gas
Pressure break is selected from carbon dioxide pressure break or propane pressure break.
Method the most according to claim 7, wherein, the proppant part used in fracturing process in step (3) is
Combustion adjuvant or oxidation catalyst.
Method the most according to claim 1, wherein, in step (4), noble gas is nitrogen or carbon dioxide gas,
Method the most according to claim 1, the method also includes being repeated in step (1)～(5) carry out many rounds and handle up
The process of exploitation.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4530396A (en) * | 1983-04-08 | 1985-07-23 | Mohaupt Henry H | Device for stimulating a subterranean formation |
| CN101161988A (en) * | 2006-10-09 | 2008-04-16 | 北京联众易盛石油开采新技术发展有限公司 | In situ combustion slug and steam driving combined type crude oil producing method |
| CN104196507A (en) * | 2014-09-03 | 2014-12-10 | 雷春娣 | Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method |
| CN104265258A (en) * | 2014-09-03 | 2015-01-07 | 雷春娣 | Fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method |
-
2016
- 2016-08-31 CN CN201610785198.8A patent/CN106246153A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4530396A (en) * | 1983-04-08 | 1985-07-23 | Mohaupt Henry H | Device for stimulating a subterranean formation |
| CN101161988A (en) * | 2006-10-09 | 2008-04-16 | 北京联众易盛石油开采新技术发展有限公司 | In situ combustion slug and steam driving combined type crude oil producing method |
| CN104196507A (en) * | 2014-09-03 | 2014-12-10 | 雷春娣 | Fireflooding huff and puff and fireflooding linkage thickened oil exploitation method |
| CN104265258A (en) * | 2014-09-03 | 2015-01-07 | 雷春娣 | Fracture-assisted combustion of oil in-situ stimulation thickened oil exploiting method |
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