CN106930740A - A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation - Google Patents
A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation Download PDFInfo
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- CN106930740A CN106930740A CN201710337821.8A CN201710337821A CN106930740A CN 106930740 A CN106930740 A CN 106930740A CN 201710337821 A CN201710337821 A CN 201710337821A CN 106930740 A CN106930740 A CN 106930740A
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- gas
- salt brine
- natural gas
- gas hydrates
- hot salt
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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
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- 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
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/0099—Equipment or details not covered by groups E21B15/00 - E21B40/00 specially adapted for drilling for or production of natural hydrate or clathrate gas reservoirs; Drilling through or monitoring of formations containing gas hydrates or clathrates
-
- 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
Abstract
The present invention relates to a kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation, it is characterized in the horizontal joint net of the prior pressure break at the top of gas hydrates reservoir of saturation hot salt brine injection, make gas hydrates fast decoupled using its salinity high and temperature, and in the presence of gravity difference, on the one hand natural gas is produced from reservoir top, another aspect hot salt brine continues to decompose gas hydrates after mixing with decomposition water.This method is greatly decreased injection rate, reduces heat energy input, and extraction natural gas causes the reservoir volume pressure drop for being formed in debt to also help speed up gas hydrate dissociation, and produces waste water without reinjection technology, can be with economic lasting exploitation of gas hydrate.
Description
Technical field
The present invention relates to a kind of method of exploitation of gas hydrate, more particularly to a kind of injection saturation hot salt brine exploitation day
The method of right gas hydrate.
Background technology
Gas hydrates are a kind of crystalline compounds with cage structure, per unit structure cell have two dodecahedrons and
Six tetrakaidecahedrons, its end points is all hydrone, and these dodecahedrons and the tetrakaidecahedron include in cage carbon hydrocarbon compound, and
More than 90% is all methane therefore gas hydrates also referred to as methane hydrate by inclusion carbon hydrocarbon compound, and molecular formula is
CH4·8H2O。
The extensive preservation of gas hydrates in seabed or permafrost soil area stratum, so far, the Gulf of Mexico, the Caribbean,
The marine sites such as South America east continental margin, Okinawa trough, the sea of Japan confirm the presence of gas hydrates.China's South Sea Shenhu sea area, green grass or young crops
The ground such as permafrost region, Changbai Mountain permafrost region are hidden it has also been found that the huge gas hydrates of reserves.Because gas hydrates contain
Amount is huge, burning is clean, and 1 cubic metre of gas hydrates decomposable asymmetric choice net goes out 164 cubic metres of natural gases, gas hydrates just into
The new energy of traditional energy is substituted for 21 century, with extraordinary development prospect.As long as production technique is further broken through, naturally
Gas hydrate will turn into the main energy sources of new century.
At present, the technology of exploitation of gas hydrate mainly has four kinds, is respectively：Step-down extraction system, thermal decomposition method, noteization
Learn inhibitor method and CO2Displacement method.The present invention relates to the integrated application of first three methods.
Voltage drop method is mainly and promotes it to decompose by reducing gas hydrates stressor layer.Typically by extracting gas water
The free gas-bearing formation of compound layer bottom realizes reducing the pressure of gas hydrates, destroys the equilibrium condition of gas hydrates, makes
Gas hydrate dissociation.But voltage drop method has particular/special requirement to gas hydrates reservoir, and due to gas hydrates
Decomposing heat absorption release water outlet can form ice, prevent gas hydrates from further decomposing.Therefore its universality is not so good, with larger
Limitation.
Thermal decomposition method is mainly by injecting hot water or steam, situ combustion method etc. to gas hydrates into being added
Heat, so that formation temperature exceedes its equilibrium temperature, promotes gas hydrate dissociation.But this method is due to along journey heat loss
And cause substantial amounts of thermal waste, so as to considerably increase cost of winning.
Note chemical inhibitor method is by gas hydrates layer injection chemical reagent (such as salt solution, methyl alcohol, ethanol)
Gas hydrates equilibrium temperature is reduced so as to promote it to be decomposed in lower temperature.Wherein, injection salt solution promotes gas water
It is cost-effective that compound is decomposed.On the one hand, salinity often improves 5%, and gas hydrate dissociation speed will improve 4%；It is another
Aspect, the average mass fraction of salt is 3.5% in seawater, and the mass fraction of 20 degrees Celsius of lower saturated brines of normal temperature is
26.74%, so configuring saturation hot salt brine with crude salt and top layer temperature seawater can substantially reduce cost of winning.
Gas-liquid gravitational differentiation phenomenon is widely used in viscous crude and super heavy oil recovery field.Because gas density is smaller, liquid
Volume density is larger, and both can occur gravitational differentiation phenomenon, i.e. air accumulation at the top of reservoir in reservoir, and liquid sinks to storage
Layer bottom.Using this phenomenon, steam heavy crude producing and super-viscous oil can be injected, gathered after making steam and viscous crude and super-viscous oil heat exchange
Collect top of oil horizon, and viscous crude and super-viscous oil the viscosity reduction after being heated, and sink to reservoir bottom and steam and separate, so that can
Viscous crude and super-viscous oil are produced with from reservoir bottom.
The present invention is based on saturation hot salt brine auxiliary thermal decomposition gas hydrates and gas-liquid gravitational differentiation phenomenon, it is proposed that
A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation.
The content of the invention
The purpose of the present invention is to propose to it is a kind of inject saturation hot brine stimulation for natural gas hydrate dissociation method, be characterized in by
The horizontal joint net of the prior pressure break at the top of gas hydrates reservoir of small size saturation hot salt brine injection, using its salinity high and temperature
Degree makes gas hydrates fast decoupled, and in the presence of gravity difference, on the one hand produces natural gas from reservoir top, another
Aspect hot salt brine mixes continuation with decomposition water and decomposes gas hydrates；The salinity and temperature of hot salt brine can all be reduced after mixing,
Gas hydrate dissociation speed slows down, when decomposition rate is less than gas hydrates the economic exploitation speed, by changing well
Net, re-injects small size saturation hot salt brine, so that last decomposition gas hydrates.This method is greatly decreased injection rate, subtracts
Few heat energy input, extraction natural gas causes the reservoir volume pressure drop for being formed in debt to also help speed up gas hydrates point
Solution, and produce waste water, exploitation reducig cost without reinjection technology.Integrated application of the present invention thermal decomposition and note chemical inhibitor are opened
The method for adopting gas hydrates.
Technical scheme：A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation, its method includes
Following steps：
1st, intend production zone in gas hydrates using existing petroleum and natural gas drilling technology and bore one by certain well pattern
Well to gas hydrates reservoir top is criticized, and forms what is linked up each other at the top of gas hydrates layer by pressing crack construction
Horizontal joint net, the contact area for injecting saturation hot salt brine, increase and gas hydrates, and as the stream of natural gas output
Dynamic passage；
2nd, sea level temperature seawater is pumped into hot salt brine pond, adds enough cheap crude salts, be configured to saturation hot salt brine；
In the seam net of the saturation hot salt brine injection gas hydrates reservoir for the 3rd, preparing small size；In saturated brine
Under salinity (NaCl mass fractions are 26.94% at 20 degrees Celsius) high and the collective effect of temperature, gas hydrates quickly divide
Solve is natural gas and water；
4th, closing well for a period of time, makes gas hydrates be fully contacted saturation hot salt brine simultaneously a large amount of after injection saturation hot salt brine
Decompose；Under gravity difference effect, the gas accumulation for coming is decomposited at the top of gas hydrates layer, decomposition water and saturated salt
Water is mixed into the relatively low mixed salt of salinity, sinks and is contacted with gas hydrates；
5th, all wells are opened, the natural gas for decompositing will be flowed in well from horizontal fracture and is plucked out of；Mixed salt is then
Continue to stay in reservoir and contacted with the gas hydrates for decomposing leading edge, be allowed to continue to decompose；
6th, saturation hot salt brine mixes with decomposition water, and its salinity and temperature will be reduced gradually, gas hydrate dissociation speed
Degree slows down, and when decomposition rate is less than gas economic exploitation rate, a part of recovery well in well pattern is changed into water injection well, continues
Injection small size saturation hot salt brine, thus can be continual and steady to maintain the salinity and temperature in gas hydrates reservoir
Tap natural gas.
The present invention due to taking such scheme, with advantages below：(1) injection rate is greatly decreased, is easy to use small size
Flow in pipes, advantageously reduces input；(2) injection rate is greatly decreased, relatively low gas hydrates reservoir pressure is maintained, has
Beneficial to acceleration gas hydrate dissociation；(3) without treatment, re-injection production waste water, input is advantageously reduced；(4) saturation is injected
Hot salt brine, reduces the decomposition temperature of gas hydrates, reduces energy input, advantageously reduces input；(5) make full use of
The gravity difference of natural gas and water so that natural gas is flowed with single-phase flow in well, reduces flow resistance；(6) saturation is injected
Hot salt brine, suitable development gas hydrates, to greatest extent using matter and energy；(7) configured with cheap crude salt
Saturation hot salt brine, advantageously reduces input.
Brief description of the drawings
Fig. 1 is a kind of technical scheme schematic diagram of the method for injecting saturation hot brine stimulation for natural gas hydrate dissociation.
In figure, suction pump 1, hot salt brine pond 2, water injecting pump 3, injection-production well 4, seawater 5, cap rock 6, gas hydrates layer 7, water
Plane fracture seam 8, workbench 9, gas-liquid separator 10.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
The present invention in the specific implementation, one is pressed using existing petroleum gas drilling and production technology in gas hydrates region
Determine well pattern and bore a collection of injection-production well 4 to the tip position of gas hydrates reservoir 7；By pressing crack construction in gas hydrates reservoir
The horizontal joint net 8 linked up each other is formed on 7 tops, to inject the contact surface of saturation hot salt brine, increase salt solution and gas hydrates
Product, and enter the flow channel of producing well as natural gas.Top layer temperature seawater 5 is extracted into by workbench 9 by suction pump 1 simultaneously
On hot salt brine pond 2 in, add enough crude salts to prepare saturation hot salt brine.Then the saturation hot salt brine for small size being prepared leads to
The infusion of water injecting pump 3 is crossed in the horizontal joint net 8 that the top of gas hydrates reservoir 7 is formed, now injection-production well 4 is used as note in advance
Well injects saturation hot salt brine.Closing well for a period of time, makes saturation hot salt brine be filled with gas hydrates after injection saturation hot salt brine
Tap is touched, and the salinity high (NaCl mass fractions are 26.94% at 20 degrees Celsius) of saturation hot salt brine can substantially reduce natural gas
Decomposition of hydrate temperature, makes the temperature of saturation hot salt brine be enough to fast decoupled gas hydrates.Under gravity difference effect, point
To the top of gas hydrates reservoir 7, decomposition water mix, sinks and natural gas is hydrated the gas accumulation of solution with saturation hot salt brine
In thing reservoir 7.Driven a well after a period of time, the natural gas for gathering the top of gas hydrates reservoir 7 is flowed to by horizontal fracture 8
Injection-production well 4, now used as the producing well for tapping natural gas, the natural of extraction further separates injection-production well 4 through gas-liquid separator 10
After be delivered to downstream；Because gravity difference continues to stay in gas hydrates layer 7 after decomposition water and the mixing of saturation hot salt brine, under
Sink and continue to contact with gas hydrates, further decompose gas hydrates.After saturation hot salt brine mixes with decomposition water, its
Salinity and temperature can all be reduced, and gas hydrate dissociation speed slows down, when decomposition rate is less than gas economic exploitation rate
When, transform the well 4 for being partly used to tap natural gas in well pattern into water injection well, persistently inject small to the top of gas hydrates layer 7
Volume saturation hot salt brine.The saturation hot salt brine for re-injecting naturally flows to gas hydrate dissociation leading edge under gravity,
Persistently promote gas hydrate dissociation.So achieve that lasting, quick, economic exploitation of gas hydrate.
Claims (3)
1. a kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation, it is characterised in that the injection of saturation hot salt brine is prior
The horizontal joint net of pressure break at the top of gas hydrates reservoir, makes gas hydrates quickly divide using its salinity high and temperature
Solution, and in the presence of gravity difference, natural gas on the one hand is produced from reservoir top, another aspect hot salt brine mixes with decomposition water
Continue to decompose gas hydrates afterwards.
2. its salinity and temperature reduction, gas hydrates point after as claimed in claim 1, decomposition water and saturation hot salt brine mix
Solution speed slows down, and when decomposition rate is less than gas economic exploitation rate, the well for tapping natural gas will to be partly used in well pattern
Transform water injection well into, saturation hot salt brine is persistently injected to gas hydrates layer top.The saturation hot salt brine for re-injecting is in gravity
Gas hydrate dissociation leading edge is naturally flowed under effect, persistently promotes gas hydrate dissociation.
3. a kind of as claimed in claim 1, method for injecting saturation hot brine stimulation for natural gas hydrate dissociation, it is characterised in that used
Saturation hot salt brine adds enough cheap crude salts to be obtained by top layer temperature seawater, and at 20 degrees Celsius, the quality point of its salt content
Number is 26.94%, and the mass fraction becomes big as temperature is raised, otherwise then reduces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710337821.8A CN106930740A (en) | 2017-05-13 | 2017-05-13 | A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation |
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| CN201710337821.8A CN106930740A (en) | 2017-05-13 | 2017-05-13 | A kind of method for injecting saturation hot brine stimulation for natural gas hydrate dissociation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676059A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of method of parallel water horizontal well chemical flooding exploitation of gas hydrate |
| CN109488260A (en) * | 2018-12-17 | 2019-03-19 | 吉林大学 | The method that exploitation of gas hydrates efficiency is improved using fracturing fluid containing expansion-resisting agent |
| CN111364960A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Device and method for inhibiting gas well natural gas hydrate generation |
| WO2020258700A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Green process for exploiting combustible ice |
| WO2020258701A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Application of micro-interface strengthening system in mining of combustible ice |
| WO2020259377A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Apparatus for mining combustible ice |
| WO2020259376A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Control system for combustible ice mining |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107676059A (en) * | 2017-10-23 | 2018-02-09 | 大庆东油睿佳石油科技有限公司 | A kind of method of parallel water horizontal well chemical flooding exploitation of gas hydrate |
| CN109488260A (en) * | 2018-12-17 | 2019-03-19 | 吉林大学 | The method that exploitation of gas hydrates efficiency is improved using fracturing fluid containing expansion-resisting agent |
| CN109488260B (en) * | 2018-12-17 | 2020-12-11 | 吉林大学 | Method for improving exploitation efficiency of natural gas hydrate by using fracturing fluid containing anti-swelling agent |
| CN111364960A (en) * | 2018-12-25 | 2020-07-03 | 中国石油天然气股份有限公司 | Device and method for inhibiting gas well natural gas hydrate generation |
| CN111364960B (en) * | 2018-12-25 | 2022-08-30 | 中国石油天然气股份有限公司 | Device and method for inhibiting gas well natural gas hydrate generation |
| WO2020258700A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Green process for exploiting combustible ice |
| WO2020258701A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Application of micro-interface strengthening system in mining of combustible ice |
| WO2020259377A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Apparatus for mining combustible ice |
| WO2020259376A1 (en) * | 2019-06-24 | 2020-12-30 | 南京延长反应技术研究院有限公司 | Control system for combustible ice mining |
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