CN109538175A - The resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak - Google Patents
The resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak Download PDFInfo
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- CN109538175A CN109538175A CN201710870133.8A CN201710870133A CN109538175A CN 109538175 A CN109538175 A CN 109538175A CN 201710870133 A CN201710870133 A CN 201710870133A CN 109538175 A CN109538175 A CN 109538175A
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- Prior art keywords
- nitrogen
- safekeeping
- low permeability
- soak
- oil
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Classifications
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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
-
- 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
Abstract
The present invention provides a kind of resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak, and the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak includes: step 1, simulates initial reservoir condition；Step 2, simulation natural energy decompression exploitation；Step 3, simulation nitrogen soak exploitation after natural energy is depressured end-of-development, carries out nitrogen soak；Step 4, simulation nitrogen+water is handled up exploitation.The has channeling that the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak generates the nitrogen soak later period has certain plugging action, so that strata pressure decrease speed slows down, sufficient energy is provided for gas-powered, carrying crude oil, it can be by the way that water slug be added, injection pressure is promoted, the diffusivity of gas is improved.
Description
Technical field
The present invention relates to oil-gas field development technical field, especially relates to a kind of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen and gulp down
Spit the resident method sealed up for safekeeping.
Background technique
Low-permeability oil deposit has become the critical position of China's proved reserves and Productivity Construction at present, is opened using pressure break and water filling
Hair, poor by reservoir properties, water drive control is low etc. influences, decreasing energy is fast, the insufficient outstanding problem of energization, demarcates adopt at present
Yield is lower.Many studies have shown that nitrogen injection is the effective ways for improving LOW PERMEABILITY RESERVOIR development effectiveness, stratum can be effectively supplemented
Energy solves LOW PERMEABILITY RESERVOIR difficult water injection, the problems such as rate of water cut increase is fast.
Nitrogen soak does not need perfect well pattern, and single well stimulation can be realized；Nitrogen has good energization effect, can be with
Supplement stratum energy；Row's effect is helped to improve barometric gradient using the energization of nitrogen soak；Nitrogen source gases are abundant, and opposite dioxy
Change for carbon, nitrogen is pollution-free, at low cost.Currently, LOW PERMEABILITY RESERVOIR nitrogen soak technology adopts parameter optimization and coordinative composition of equipments in note
Aspect has all carried out correlative study.
But field conduct finds the increase with the period of handling up, and harvesting degree is lower and lower, and oil draining rate is low, nitrogen soak effect
Fruit is undesirable.It is primarily due to nitrogen and gradually forms big continuous passage during handling up, gas channeling phenomenon is tight in recovery process
Weight, nitrogen can not form effective resident on stratum.Simple energization effect has limited the development of nitrogen soak, therefore needs
A kind of nitrogen compound throughput method is explored, the effect of nitrogen soak is enhanced from the angle of auxiliary additive.
Summary of the invention
The object of the present invention is to provide the undesirable oil wells of a kind of pair of nitrogen soak anaphase effect to carry out secondary development, realizes
The resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak of the exploitation of nitrogen soak later period LOW PERMEABILITY RESERVOIR efficient stable.
The purpose of the present invention can be achieved by the following technical measures: LOW PERMEABILITY RESERVOIR water slug assists the resident envelope of nitrogen soak
The method deposited, the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak includes: step 1, simulates initial reservoir item
Part；Step 2, simulation natural energy decompression exploitation；Step 3, simulation nitrogen soak exploitation, after natural energy is depressured end-of-development,
Carry out nitrogen soak；Step 4, simulation nitrogen+water is handled up exploitation.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, rock core is connected into core holding unit, reservoir temperature T is arranged in detection device air-tightness0, reservoir pressure
P0, it is saturated water flooding, and test permeability, then saturated oils, metering saturation oil quality m.
In step 2, rock core outlet pressure is gradually decreased, crude oil output in the case where elasticity can act in rock core, when rock core pressure
Power is down to certain pressure P1Afterwards, stop decompression, record oil production m1, harvest degree R1=m1/ m, wherein m is saturation oil quality.
In step 3, certain volume nitrogen, injection pressure to certain pressure P are injected first into rock core2After terminate to infuse
Then gas boils in a covered pot over a slow fire well, boiling in a covered pot over a slow fire the well time is M1, decompression is started with certain pressure drop rate after boiling in a covered pot over a slow fire well and is produced, is recorded under different moments
Oil-producing m2, produce gas, Pressure Variation, calculate harvesting degree R2=m2/ m, wherein m is saturation oil quality.
In step 3, if single harvests degree R > 5%, process return step 3 continues nitrogen soak, if single
Harvesting degree R < 5%, then process enters step 4, carries out nitrogen+water and handles up.
In step 3, control valve aperture is to start decompression production after stewing well with certain pressure drop rate.
In step 4, the nitrogen V of certain volume is injected first into rock core1, reinject the water V of certain volume2, it is forced into
Certain pressure P3；Then well is boiled in a covered pot over a slow fire, boiling in a covered pot over a slow fire the well time is M2, decompression is started with certain pressure drop rate after boiling in a covered pot over a slow fire well and is produced, record is different
When inscribe oil-producing, produce water, produce gas, Pressure Variation.
In step 4, according to decompression exploitation and nitrogen soak oil production and the design nitrogen injection of next stage water injection rate
Measure V1。
In step 4, nitrogen injection rate V under condition is marked1Calculation formula are as follows:
V1=((m1+m2)/ρOil-V2)×P3×10
Wherein, ρOilThe density of oil, m1, m2 are respectively that pressure drops to P1, when P2 corresponding output oil quality.
In step 4, the volume V of water is injected2For 0.05pv.
In step 4, control valve aperture is to start decompression production after stewing well with certain pressure drop rate.
The resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak in the present invention, can be by being added water section
Plug forms oil, gas and water three phase fluid flow at the nearly well end in extraction stage, so that the gas speed of response is reduced, to the nitrogen soak later period
The has channeling of generation has certain plugging action, so that strata pressure decrease speed slows down, provides for gas-powered, carrying crude oil
Sufficient energy.The present invention can promote injection pressure, improve the diffusivity of gas by the way that water slug is added.The present invention can
It is handled up with being applied to other oil reservoir gases, Oil Reservoir Types are not limited to LOW PERMEABILITY RESERVOIR, and injection gas is not limited to nitrogen.The present invention
The other types exploitation that can be applied to generate has channeling, is not limited to exploitation of handling up.
Detailed description of the invention
Fig. 1 is the specific embodiment that LOW PERMEABILITY RESERVOIR water slug of the invention assists the resident method sealed up for safekeeping of nitrogen soak
Flow chart；
Fig. 2 is that water slug assists nitrogen soak and the pressure that water slug nitrogen soak is not added in a specific embodiment of the invention
Poor comparison diagram.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out
Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the processes of the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug of the invention auxiliary nitrogen soak
Figure.
In step 101, simulation initial reservoir condition；Rock core is connected into core holding unit, detection device air-tightness, setting oil
Hide temperature T0, reservoir pressure P0, it is saturated water flooding, and test permeability, then saturated oils, metering saturation oil quality m, and calculate
Initial oil saturation.
In step 102, simulation natural energy decompression exploitation；Rock core outlet pressure is gradually decreased, crude oil is in elasticity in rock core
Lower output can be acted on, when rock core pressure is down to certain pressure P1Afterwards, stop decompression, record oil production m1, harvest degree R1=m1/
m。
In step 103, simulation nitrogen soak exploitation；After natural energy is depressured end-of-development, carry out nitrogen soak.First to
Certain volume nitrogen, injection pressure to certain pressure P are injected in rock core2After terminate gas injection, then boil in a covered pot over a slow fire well, boil in a covered pot over a slow fire the well time be M1, boil in a covered pot over a slow fire
Decompression production is started with certain pressure drop rate (control valve step door aperture) after well, records oil-producing m under different moments2, produce
Gas, Pressure Variation calculate harvesting degree R2=m2/m.If single harvests degree R > 5%, continue nitrogen soak, if
Single harvests degree R < 5%, then carries out nitrogen+water and handle up.
It handles up exploitation in step 104, simulation nitrogen+water；The nitrogen V of certain volume is injected first into rock core1(according to drop
Press off hair and nitrogen soak oil production and next stage water injection rate design nitrogen injection rate), reinject the water of certain volume
V2, it is forced into certain pressure P3.Then well is boiled in a covered pot over a slow fire, boiling in a covered pot over a slow fire the well time is M2, boil in a covered pot over a slow fire well after with certain pressure drop rate, (control valve is opened
Degree) start decompression production, oil-producing under different moments is recorded, water is produced, produces gas, Pressure Variation.The V1(according to decompression exploitation and
Nitrogen soak oil production and next stage water injection rate design nitrogen injection rate) refer to:
It marks under condition, V1=((m1+m2)ρOil-V2)×P3×10
Wherein, ρOilThe density of oil, m1, m2 are respectively that pressure drops to P1, when P2 corresponding output oil quality.
The water V of the injection certain volume2Refer to: the volume for injecting water is 0.05pv.
Difference with the prior art of the present invention mainly increases water slug, to be used to block nitrogen soak later period has channeling
The bulk gas of generation.And then sufficient stratum energy is provided for gas-powered, carrying crude oil.
In this application one embodiment of the invention, the gas is nitrogen, and the rock core is low permeability cores.The present invention is also
It is not limited to nitrogen and low permeability cores.Rock core uses cuboid rock core, and rock core is having a size of D1=D2=45mm, L=300mm, hole
Volume is 120ml, permeability 50mD.
Step (1) simulates initial reservoir condition.Rock core is connected into core holding unit, T is arranged in detection device air-tightness0=
80 DEG C, P0=15MPa using saturation water flooding, and tests permeability, then saturated oils, final to be saturated crude oil m=93g；
Step (2) simulates natural energy decompression exploitation.Rock core outlet pressure is gradually decreased, crude oil can be made in elasticity in rock core
With lower output, (P after pressure is down to centainly1=0.1MPa), stop decompression, records oil production.Final oil production is 9.5g, is adopted
Receipts degree R1=9.51/93=10.22%.
Step (3) simulates nitrogen soak exploitation.After natural energy is depressured end-of-development, carry out nitrogen soak.First to rock
Intracardiac injection certain volume nitrogen terminates gas injection after injection pressure to certain pressure 15MPa, then boils in a covered pot over a slow fire well, and boiling in a covered pot over a slow fire the well time is 12
Hour, decompression production is started with certain pressure drop rate (control valve aperture is 1/4) after stewing well, records and is produced under different moments
Oil produces gas, Pressure Variation.Wherein first time nitrogen soak oil production is 12.7g, harvests degree R=12.7/93=
13.66% > 5%, carry out second of nitrogen soak.Second oil production is 4.4g, harvesting degree R=4.4/93=4.73% <
5%, it carries out nitrogen+water and handles up.
Step (4) simulation nitrogen+water is handled up exploitation.First into rock core inject certain volume nitrogen 3600ml (according to
Decompression exploitation and nitrogen soak oil production and next stage water injection rate design nitrogen injection rate), reinject the water of certain volume
6ml, increased pressure are stablized in 15MPa or so.Then well is boiled in a covered pot over a slow fire, boiling in a covered pot over a slow fire the well time is 12 hours, with a constant pressure drop after stewing well
Speed (control valve aperture position 1/4) starts decompression production, records oil-producing under different moments, produces water, produces gas, pressure change rule
Rule.Its Liquid output is 15.72g, subtracts the quality of water, oil production 9.72g.Harvesting degree is 10.45%, is effectively improved
Nitrogen soak later period oil-producing effect.
Fig. 2 can see water slug auxiliary nitrogen soak and the pressure difference comparison diagram that water slug nitrogen soak is not added.For same
The period of sample, same gas injection rate can form higher pressure difference, and extend this producing pressure differential after water slug is added.This can
To provide sufficient energy for gas-powered, carrying crude oil.
Claims (11)
1. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak, which is characterized in that the LOW PERMEABILITY RESERVOIR water slug is auxiliary
The resident method sealed up for safekeeping of nitrogen soak is helped to include:
Step 1, initial reservoir condition is simulated；
Step 2, simulation natural energy decompression exploitation；
Step 3, simulation nitrogen soak exploitation after natural energy is depressured end-of-development, carries out nitrogen soak；
Step 4, simulation nitrogen+water is handled up exploitation.
2. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 1, which is characterized in that
In step 1, rock core is connected into core holding unit, reservoir temperature T is arranged in detection device air-tightness0, reservoir pressure P0, saturation ground
Layer water, and permeability is tested, then saturated oils, metering are saturated oil quality m.
3. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 1, which is characterized in that
In step 2, rock core outlet pressure is gradually decreased, crude oil output in the case where elasticity can act in rock core, when rock core pressure is down to one
Constant-pressure P1Afterwards, stop decompression, record oil production m1, harvest degree R1=m1/ m, wherein m is saturation oil quality.
4. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 1, which is characterized in that
In step 3, certain volume nitrogen, injection pressure to certain pressure P are injected first into rock core2After terminate gas injection, then boil in a covered pot over a slow fire
Well, boiling in a covered pot over a slow fire the well time is M1, decompression is started with certain pressure drop rate after boiling in a covered pot over a slow fire well and is produced, oil-producing m under different moments is recorded2, produce
Gas, Pressure Variation calculate harvesting degree R2=m2/ m, wherein m is saturation oil quality.
5. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 4, which is characterized in that
In step 3, if single harvests degree R > 5%, process return step 3 continues nitrogen soak, if single harvests degree
R < 5%, then process enters step 4, carries out nitrogen+water and handles up.
6. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 4, which is characterized in that
In step 3, control valve aperture is to start decompression production after stewing well with certain pressure drop rate.
7. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 1, which is characterized in that
In step 4, the nitrogen V of certain volume is injected first into rock core1, reinject the water V of certain volume2, it is forced into certain pressure
P3；Then well is boiled in a covered pot over a slow fire, boiling in a covered pot over a slow fire the well time is M2, decompression is started with certain pressure drop rate after boiling in a covered pot over a slow fire well and is produced, records and is produced under different moments
Oil produces water, produces gas, Pressure Variation.
8. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 7, which is characterized in that
In step 4, nitrogen injection rate V is designed according to decompression exploitation and nitrogen soak oil production and next stage water injection rate1。
9. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 8, which is characterized in that
In step 4, nitrogen injection rate V under condition is marked1Calculation formula are as follows:
V1=((m1+m2)/ρOil-V2)×P3×10
Wherein, ρOilThe density of oil, m1, m2 are respectively that pressure drops to P1, when P2 corresponding output oil quality.
10. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 7, feature exist
In in step 4, injecting the volume V of water2For 0.05pv.
11. the resident method sealed up for safekeeping of LOW PERMEABILITY RESERVOIR water slug auxiliary nitrogen soak according to claim 7, feature exist
In in step 4, control valve aperture is to start decompression production after stewing well with certain pressure drop rate.
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| CN201710870133.8A CN109538175B (en) | 2017-09-22 | 2017-09-22 | Method for assisting nitrogen gas huff-puff resident sealing storage of low-permeability reservoir water slug |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111950755A (en) * | 2019-05-16 | 2020-11-17 | 中国石油天然气股份有限公司 | Vertical well nitrogen foam polymer gel-assisted superheated steam throughput parameter optimization method |
| CN114109304A (en) * | 2021-11-25 | 2022-03-01 | 四川轻化工大学 | Temporary plugging agent assisted carbon dioxide huff and puff oil production method |
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| CN111950755A (en) * | 2019-05-16 | 2020-11-17 | 中国石油天然气股份有限公司 | Vertical well nitrogen foam polymer gel-assisted superheated steam throughput parameter optimization method |
| CN111950755B (en) * | 2019-05-16 | 2024-05-03 | 中国石油天然气股份有限公司 | Vertical well nitrogen foam polymer gel-assisted superheated steam throughput parameter optimization method |
| CN114109304A (en) * | 2021-11-25 | 2022-03-01 | 四川轻化工大学 | Temporary plugging agent assisted carbon dioxide huff and puff oil production method |
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| CN109538175B (en) | 2021-06-01 |
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