CN106223911A - A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method - Google Patents
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method Download PDFInfo
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- CN106223911A CN106223911A CN201610623446.9A CN201610623446A CN106223911A CN 106223911 A CN106223911 A CN 106223911A CN 201610623446 A CN201610623446 A CN 201610623446A CN 106223911 A CN106223911 A CN 106223911A
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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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
- C09K8/594—Compositions used in combination with injected gas, e.g. CO2 orcarbonated gas
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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
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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
- E21B43/18—Repressuring or vacuum methods
-
- 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
- E21B43/241—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection combined with solution mining of non-hydrocarbon minerals, e.g. solvent pyrolysis of oil shale
-
- 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
Abstract
The present invention provides a kind of and notes strong pressure-air, oxygen-enriched flooding method to deep buried hill reservoir, comprise the following steps: first gas injection well is carried out high-pressure gas injection well completion, injecting 0.05～0.15PV initiator after completion in gas injection well, initiator uses sodium sarcosinate and mannitol；Carry out strong high-pressure gas injection, inject 3～50,000 mark side's air to stratum；Denitrogenated by air, isolate oxygen quality percentage ratio 50～the oxygen-rich mixture of 70%, oxygen-rich mixture is injected oil reservoir；Carry out strong high-pressure gas injection；After local slabbing solution is stable, strengthens gas injection rate and carry out strong high-pressure gas injection.The crude oil of script colloid, heavy is cracked under formation temperature effect by this method through Strong oxdiative, greatly improves rate of oil production and recovery ratio that follow-up air drives, reduces the oxidative cracking reaction time, it is achieved Quick Oxidation cracks, and improves the service efficiency of gas.
Description
Technical field
The present invention relates to a kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, belong to oil and open
Adopt field.
Background technology
The reservoir of buried hill reservoir has storage diverse with sandstone oil reservoir reservoir and oozes structure, has oil reservoir deeper
(major part 2000～7000 meters), the feature of oil reservoir thicker (typically between 100～600 meters), with other air injection displacement of reservoir oil side
Method is completely different, first has to accurately judge that this oil reservoir is gas-drive pool or water drive oil reservoir, and gas-drive pool is at the bottom of oil reservoir in this way
Portion's gas injection, limit, bottom water water-drive pool are then in the gas injection of oil reservoir high-order bit in this way, are to use high-power full load gas injection pattern.
Substantial amounts of research shows, the reservoir of buried hill reservoir is actually made up of two kinds of storage systems of oozing, i.e. Fracture System and rock
Block system.The reservoir space of the two system, permeability, porosity and oil recovery mechanism are far from it.
(1) Fracture System, is by the crack that width lower limit under reservoir condition is 10 μm and to be attached thereto logical solution cavity institute group
The fracture pore network become, the most usually said macropore and intermediate pore, there is low hole, feature that height oozes, crack during oil recovery
The capillary force effect of system is negligible.
(2) rock mass, is made up of the sillar cut by crack, and the reservoir and flow space in sillar includes that width is less than
10 μm gaps and coupled same intergranular, intercrystalline pore, corrosion hole, its porosity is big compared with Fracture System porosity, is
Good oil storage space, but its permeability is poor.
Rock mass mechanism of oil displacement is: under the flowing pressure gradient between Fracture System and rock mass, displacing medium
Entering sillar oil extraction, the water in Fracture System relies on the capillary force effect of hydrophilic sillar to suck sillar oil extraction, at crack～hole
In dual media, in addition to pressure reduction, imbibition, action of gravity driving force, channelling, diffusion, sillar～sillar effect are equal to oil displacement process
Participation effect.
Due to buried hill reservoir temperature, the geologic feature of the degree of depth, the physical property (water absorbing capacity is strong) of oil reservoir, need at sky
Inject large quantity of air, oxygen before gas drive and carry out the transformation on stratum.
In buried hill formation, the composition of rock is mainly carbonate and aluminosilicate.Aluminosilicate has typical flake crystalline
Body structure, this kind of crystal is made up of two class basic structures: a class is made up of silicone atom layer, apparent in tetrahedral geometry, is referred to as
Silica sheet；Another kind of is to be made up of magnesium, aluminum hydrogen-oxygen atomic layer, apparent in octahedral form, referred to as water aluminium flake.Buried hill formation is big
Part is formed by above Liang Lei fundamental tissue.In tissue, silicon atom can be replaced by aluminum atom, aluminum atom in octahedral structure body
Can be replaced by low-valent metal atom, thus cause crystal structure surface charge uneven, every layer of surface can be caused the most adsorbable
There is various types of cation.
The research in prior art exploited buried hill reservoir is less, and does not use initiator, there is oxidation and splits
Solution speed is slow, rate of oil production and the low problem of recovery ratio.Existing air-injection displacement technology is primarily adapted for use in the oil reservoir degree of depth 1000 meters
The oil reservoir of left and right, bad to the exploitation effect of buried hill reservoir.
Summary of the invention
For solving the problems referred to above, the present invention provides a kind of and notes strong pressure-air, the oxygen-enriched displacement of reservoir oil to deep buried hill reservoir
Method, by carrying out stratum transformation (for adapting to Fracture System, rock mass) to deep buried hill reservoir note initiator and air,
Be then poured into oxygen-rich mixture to light a fire, it is achieved Quick Oxidation crack, and follow-up in the way of strong high pressure to stratum gas injection, enter
Row quickly diffusion, quickly propels cracking band, buried hill reservoir is carried out the efficient displacement of reservoir oil.
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, deposit according to the tax of buried hill reservoir
Condition, geological structure and well pattern arrangement situation, select gas injection well and producing well, comprise the following steps:
First step 1. carries out high-pressure gas injection well completion to gas injection well；
In gas injection well, the mixture of 0.05～0.15PV sodium sarcosinate and mannitol, sarcosine is injected after step 2. completion
Sodium is 1: 2～1: 4 with the mass ratio of mannitol, and confection is soluble in water, and mass percent is 2%～5%；
Step 3. carries out strong high-pressure gas injection, by gas injection well to stratum injection 3～50,000 mark side's air, the oxygen in air
Composition carries out full load gas injection to buried hill crack, sillar, is split by crude oil Strong oxdiative under formation temperature effect of colloid, heavy
Solve, the addedly lower deficit of the nitrogen of generation, carbon dioxide, drive for follow-up air and carry out early stage basis；
Step 4. is denitrogenated by air, isolate oxygen-rich mixture (mass percent is oxygen 50～70%, nitrogen 30～
50%), 3～50,000 mark side's oxygen-rich mixtures are injected oil reservoir, oxygen-rich fraction and crude oil generation redox reaction, promotes crude oil
Cracking, discharges heat, due to the former formation temperature of buried hill reservoir higher (120～300 °), the oxygen of injection can be made quickly with former
The raw cracking reaction of oily hair, can realize oil reservoir autogenous ignition, oil reservoir generation Strong oxdiative can be made to crack.After oil reservoir generation cracking reaction,
Discharge substantial amounts of CO2And heat, CO2It is partially soluble in crude oil, serves as surfactant, crude oil is diluted, simultaneously because note
Enter large quantity of air and oxygen-enriched, realize renwing stratum reset pressure by oxicracking, recover original oil recovery energy；
Step 5. carries out strong high pressure air injection, along with the lasting injection of strong pressure-air, the CO that oxidative cracking reaction produces2
Form pneumatic jack with nitrogen in top of oil horizon, oil reservoir is applied downward immense pressure, constantly supplements stratum energy；
Step 6., by oxygen discharge capacity in producing well inspection tail gas, calculates underground cracking situation and speed；
Step 7. is as CO in tail gas2Discharge capacity reach 8～15%, O2When discharge capacity reaches 1～4%, stratum cracking is stable,
Use air compressor system to strengthen gas injection rate, original gas injection rate increases by 15～25% and carries out strong high-pressure gas injection, make cracking quick
Advance, the most addedly stressor layer, with landing surface ability and the continuous rising of strata pressure, promote crude oil to flow to producing well direction
Dynamic also extraction, energy opposite side water, bottom water play control action simultaneously.
Preferably, in step 1 during completion, successively in lower going-into-well parts order be horn mouth, packer, relief valve, sliding sleeve,
Compensator, along with at the bottom of oil pipe in the lump lower going-into-well, enter under horn mouth to more than artificial bottom of a well 2～5 meters, more than lower rock stratum 5～10
At meter, perforated interval middle and lower part, packer location adjusts at more than overlying rock 2～5 meters, relief valve be adjusted on packer 10～
At 20 meters, sliding sleeve is adjusted to, at relief valve top 10～15 meters, carry out packer and seal under whole parts after entering, packer with
Sleeve closure, is formed and closes space, make injection air guarantee on request and design entrance oil reservoir.
Preferably, in the oxygen-rich mixture injected in step 4, the mass percent of oxygen is 60%；
Preferably, the gas injection pressure of the strong high-pressure gas injection of step 3,5 and 7 is 25～50Mpa.
The dominant mechanism injecting oxygen-rich mixture transformation stratum in oil reservoir is, after oxygen enters stratum, with the ground of crude oil
Layer water (having certain salinity) and buried hill rock reacts and reservoir temperature is high, produces free radical, have automatic from
Combustion Oxidation, the reaction of oxyradical can be divided mainly into three steps: i.e. causes, and increases and terminates:
Cause: formation rock → ROO
Increase: RO2·+R/H→ROOH+R·/R·/+·O2→R/OO·
Terminate: 2R/OO → torpescence material
Formation rock system absorbs energy, generates peroxy radical R/OO and replaces the functionalized cationic of absorption originally
Group, forms free radical R/and hydroperoxidation group ROOH, and now, in rock system, free radical is combined with oxygen, forms peroxide certainly
By base, such process is repeated multiple times, will show hydrophilic in the earth formation.Due to the existence of formation water, will be formed in mantle of rock
One layer of hydration shell, makes crude oil gradually peel off, it is easier to be plucked out of.It is injected simultaneously into air and will increase substantially original formation pressure,
Supplement stratum energy, strengthen elastic, mobility.
The present invention compared with prior art has the advantage, that
The most relatively conventional oil recovery, the present invention has carried out early stage note initiator (sodium sarcosinate and mannitol) and air, has drawn
Send out under the effect of agent, by the oxygen in air, buried hill formation transformed, by oxygen and formation water and Fracture System,
The concerted reaction of rock mass, cracks the crude oil of script colloid, heavy through Strong oxdiative under formation temperature effect, is greatly improved
Rate of oil production that follow-up air drives and recovery ratio, it is possible to effectively supplement energy, renwing stratum reset pressure.
2. denitrogenated by air, isolate oxygen-rich mixture injection stratum and light a fire, reduce the oxidative cracking reaction time,
Realize Quick Oxidation cracking, be prevented effectively from nitrogen content too high generation gas channeling phenomenon, and can the most explosion-proof, anticorrosion, to greatest extent
Ensure that safety work.
Follow-up persistently inject strong pressure-air for a long time, effectively extraction can originally be difficult to the crude oil employed, originally by water logging,
Oil recovery energy deficiency all can carry out air injection complex oil displacing.
4. by injecting air for a long time, top of oil horizon forms artificial gas cap, applies to increase downwards pressure, constantly to oil reservoir
Supplement stratum energy, it is achieved multinomial mixed phase complex oil displacing and gravity auxiliary oil drainage.
5. in completion mode, bell-mouthed under enter position, and horn mouth and packer with the use of can make the first slug,
Second slug more effectively injects stratum, thus improves the service efficiency of gas.
6. with the pressure of 25～50MPa, stratum is carried out strong high-pressure gas injection, diffusion velocity can be improved, increase further and adopt
Yield.
7., after local slabbing solution is stable, strengthens gas injection rate and carry out strong high-pressure gas injection, make cracking quickly propel, the most addedly
Stressor layer, applies immense pressure to edge-bottom water system, and by edge-bottom water passage plugging, solving buried hill reservoir edge-bottom water affects water logging
A difficult problem for oil reservoir, can improve oil recovery, it is achieved the efficiently displacement of reservoir oil.
The present invention is applicable to straight well, horizontal well, SAGD well, has stronger adaptability.
Accompanying drawing explanation
Fig. 1: completion schematic diagram
Fig. 2: initiator sphere of action schematic diagram
In figure: 1 sliding sleeve；2 sleeve pipes；3 relief valve；4 oil pipes；5 packers；6 overlying rocks；7 perforated intervals；8 horn mouths；9 people
Work shaft bottom；10 times rock stratums；11 oil reservoirs；12 air compressor systems；13 compensators；14 nitrogen removal system；15 initiator sphere of actions；16
Ground；17 buried hill areas；19 pneumatic jacks.
Detailed description of the invention
In order to the technical characteristic of the present invention, purpose and effect are more clearly understood from, now illustrate that the present invention's is concrete
Embodiment.
Embodiment 1
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, comprise the following steps:
First step 1. carries out high-pressure gas injection well completion to gas injection well, as it is shown in figure 1, parts order is in lower going-into-well successively
Horn mouth (8), packer (5), relief valve (3), sliding sleeve (1), compensator (13), along with at the bottom of oil pipe (4) lower going-into-well in the lump, loudspeaker
Enter under Kou to more than artificial bottom of a well (9) 4 meters, more than lower rock stratum (10) at 7 meters, perforated interval (7) middle and lower part, packer location is adjusted
Whole at more than overlying rock (6) 3 meters, relief valve is adjusted on packer at 18 meters, and sliding sleeve is adjusted at 10 meters of relief valve top, entirely
Carrying out packer after entering under portion's parts to seal, packer seals with sleeve pipe (2), is formed and closes space.
In gas injection well, 0.05PV sodium sarcosinate and mannitol mixture, sodium sarcosinate and manna is injected after step 2. completion
The mass ratio of alcohol is 1: 2, and confection is soluble in water, and mass percent is 3%.
Step 3. injects 30,000 mark side's air by gas injection well to stratum, and gas injection pressure is 30Mpa.
Step 4., as in figure 2 it is shown, denitrogenated by air by nitrogen removal system (14), isolates oxygen-rich mixture (percent mass
Ratio is oxygen 60%, nitrogen 40%), oil reservoir (11) is injected in oxygen-rich mixture 30,000 mark side.
Step 5. carries out strong high pressure air injection (30Mpa), and along with the lasting injection of strong pressure-air, oxidative cracking reaction produces
Raw CO2Pneumatic jack (19) is formed in top of oil horizon with nitrogen.
Step 6., by oxygen discharge capacity in producing well inspection tail gas, calculates underground cracking situation and speed.
Step 7. is as CO in tail gas2Discharge capacity 10%, O2During discharge capacity 1%, stratum cracking is stable, uses air compressor system
(12) strengthen gas injection rate, original gas injection rate increases by 15% and carries out strong high-pressure gas injection (30Mpa), make cracking quickly propel, push away
Dynamic crude oil is to the flowing of producing well direction extraction, and opposite side water, bottom water play control action simultaneously.
Embodiment 2
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, comprise the following steps:
First step 1. carries out high-pressure gas injection well completion to gas injection well, as it is shown in figure 1, parts order is in lower going-into-well successively
Horn mouth (8), packer (5), relief valve (3), sliding sleeve (1), compensator (13), along with at the bottom of oil pipe (4) lower going-into-well in the lump, loudspeaker
Enter under Kou to more than artificial bottom of a well (9) 5 meters, more than lower rock stratum (10) at 10 meters, perforated interval (7) middle and lower part, packer location
Adjusting at more than overlying rock (6) 5 meters, relief valve is adjusted on packer at 15 meters, and sliding sleeve is adjusted at 10 meters of relief valve top,
Carrying out packer after all entering under parts to seal, packer seals with sleeve pipe (2), is formed and closes space.
In gas injection well, 0.1PV sodium sarcosinate and mannitol mixture, sodium sarcosinate and manna is injected after step 2. completion
The mass ratio of alcohol is 1: 3, and confection is soluble in water, and mass percent is 2%.
Step 3. injects 40,000 mark side's air by gas injection well to stratum, and gas injection pressure is 40Mpa.
Step 4., as in figure 2 it is shown, denitrogenated by air by nitrogen removal system (14), isolates oxygen-rich mixture (percent mass
Ratio is oxygen 50%, nitrogen 50%), oil reservoir (11) is injected in oxygen-rich mixture 40,000 mark side.
Step 5. carries out strong high pressure air injection (40Mpa), and along with the lasting injection of strong pressure-air, oxidative cracking reaction produces
Raw CO2Pneumatic jack (19) is formed in top of oil horizon with nitrogen.
Step 6., by oxygen discharge capacity in producing well inspection tail gas, calculates underground cracking situation and speed.
Step 7. is as CO in tail gas2Discharge capacity 8.5%, O2During discharge capacity 3%, stratum cracking is stable, uses air compressor system
(12) strengthen gas injection rate, original gas injection rate increases by 15% and carries out strong high-pressure gas injection (40Mpa), make cracking quickly propel, push away
Dynamic crude oil is to the flowing of producing well direction extraction, and opposite side water, bottom water play control action simultaneously..
Embodiment 3
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, comprise the following steps:
First step 1. carries out high-pressure gas injection well completion to gas injection well, as it is shown in figure 1, parts order is in lower going-into-well successively
Horn mouth (8), packer (5), relief valve (3), sliding sleeve (1), compensator (13), along with at the bottom of oil pipe (4) lower going-into-well in the lump, loudspeaker
Enter under Kou to more than artificial bottom of a well (9) 3 meters, more than lower rock stratum (10) at 5 meters, perforated interval (7) middle and lower part, packer location is adjusted
Whole at more than overlying rock (6) 4 meters, relief valve is adjusted on packer at 15 meters, and sliding sleeve is adjusted at 10 meters of relief valve top, entirely
Carrying out packer after entering under portion's parts to seal, packer seals with sleeve pipe (2), is formed and closes space.
In gas injection well, 0.15PV sodium sarcosinate and mannitol mixture, sodium sarcosinate and manna is injected after step 2. completion
The mass ratio of alcohol is 1: 4, and confection is soluble in water, and mass percent is 5%.
Step 3. injects 50,000 mark side's air by gas injection well to stratum, and gas injection pressure is 50Mpa.
Step 4., as in figure 2 it is shown, denitrogenated by air by nitrogen removal system (14), isolates oxygen-rich mixture (percent mass
Ratio is oxygen 50%, nitrogen 50%), oil reservoir (11) is injected in oxygen-rich mixture 50,000 mark side.
Step 5. carries out strong high pressure air injection (50Mpa), and along with the lasting injection of strong pressure-air, oxidative cracking reaction produces
Raw CO2Form pneumatic jack (19) with nitrogen in top of oil horizon, oil reservoir is applied downward immense pressure, constantly supplement stratum energy
Amount.
Step 6., by oxygen discharge capacity in producing well inspection tail gas, calculates underground cracking situation and speed.
Step 7. is as CO in tail gas2Discharge capacity 8%, O2During discharge capacity 3%, stratum cracking is stable, uses air compressor system
(12) strengthen gas injection rate, original gas injection rate increases by 15% and carries out strong high-pressure gas injection (50Mpa), make cracking quickly propel, push away
Dynamic crude oil is to the flowing of producing well direction extraction, and opposite side water, bottom water play control action simultaneously.
Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Thin elaboration, the foregoing is only the specific embodiment of the present invention, and the protection domain being not intended to limit the present invention is all in the present invention
Spirit and principle within, any modification, equivalent substitution and improvement etc. done, should be included in protection scope of the present invention it
In.
Claims (4)
1. note strong pressure-air, oxygen-enriched flooding method to deep buried hill reservoir for one kind, it is characterised in that include following step
Rapid:
First step 1. carries out high-pressure gas injection well completion to gas injection well；
In gas injection well, 0.05～0.15PV sodium sarcosinate and mannitol mixture, wherein sodium sarcosinate is injected after step 2. completion
Being 1: 2～1: 4 with the mass ratio of mannitol, confection is soluble in water, and mass percent is 2%～5%；
Step 3. carries out strong high-pressure gas injection by gas injection well, injects 3～50,000 mark side's air to stratum；
Step 4. is denitrogenated by air, isolates oxygen-rich mixture, and oxygen-rich mixture includes that mass percent is 50～70%
Oxygen and 30～the nitrogen of 50%, injects oil reservoir (11) by oxygen-rich mixture 3～50,000 mark side；
Step 5. carries out strong high pressure air injection, the CO that oxidative cracking reaction produces2Pneumatic jack (19) is formed in top of oil horizon with nitrogen；
Step 6., by oxygen discharge capacity in producing well inspection tail gas, calculates underground cracking situation and speed；
Step 7. is as CO in tail gas2Discharge capacity reach 8～15%, O2When discharge capacity reaches 1～4%, stratum cracking is stable, uses
Air compressor system (12) strengthens gas injection rate, increases by 15～25% and carry out strong high-pressure gas injection on original gas injection rate, promote crude oil to
The flowing of producing well direction extraction, opposite side water, bottom water play control action simultaneously.
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, its feature
Being: in step 1 during completion, in lower going-into-well, parts order is horn mouth (8), packer (5), relief valve (3), sliding sleeve successively
(1), compensator (13), along with at the bottom of oil pipe (4) lower going-into-well in the lump, enter under horn mouth to more than artificial bottom of a well (9) 2～5 meters, under cover
More than rock stratum (10) at 5～10 meters, perforated interval (7) middle and lower part, packer location adjusts to more than overlying rock (6) 2～5 meters
Place, relief valve is adjusted on packer at 10～20 meters, and sliding sleeve is adjusted to, at relief valve top 10～15 meters, enter complete under whole parts
After carry out packer and seal, packer seals with sleeve pipe (2), is formed and closes space.
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, its feature
It is: in the oxygen-rich mixture injected in step 4, the mass percent of oxygen is 60%.
A kind of to deep buried hill reservoir note strong pressure-air, oxygen-enriched flooding method, its feature
It is: the gas injection pressure of the strong high-pressure gas injection of step 3,5 and 7 is 25～50Mpa.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112443300A (en) * | 2019-09-05 | 2021-03-05 | 沈阳烳汇科技有限公司 | Method for high-yield fractured buried hill oil reservoir |
| CN113622882A (en) * | 2021-09-06 | 2021-11-09 | 闫雪 | Air injection oil extraction equipment and oil extraction method for ancient buried hill oil reservoir |
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