CN106121618B - For the oxidant injection device of Underground Coal Gasification Process and its application - Google Patents
For the oxidant injection device of Underground Coal Gasification Process and its application Download PDFInfo
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- CN106121618B CN106121618B CN201610716987.6A CN201610716987A CN106121618B CN 106121618 B CN106121618 B CN 106121618B CN 201610716987 A CN201610716987 A CN 201610716987A CN 106121618 B CN106121618 B CN 106121618B
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- 239000007800 oxidant agent Substances 0.000 title claims abstract description 216
- 230000001590 oxidative effect Effects 0.000 title claims abstract description 205
- 239000003245 coal Substances 0.000 title claims abstract description 150
- 238000002309 gasification Methods 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 117
- 238000002347 injection Methods 0.000 title claims abstract description 100
- 239000007924 injection Substances 0.000 title claims abstract description 100
- 230000008569 process Effects 0.000 title claims abstract description 76
- 238000010008 shearing Methods 0.000 claims abstract description 13
- 238000004804 winding Methods 0.000 claims abstract description 8
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 47
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 44
- 239000001301 oxygen Substances 0.000 claims description 44
- 229910052760 oxygen Inorganic materials 0.000 claims description 44
- 239000002826 coolant Substances 0.000 claims description 43
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 25
- 239000007789 gas Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 239000001569 carbon dioxide Substances 0.000 claims description 11
- 238000007254 oxidation reaction Methods 0.000 claims description 11
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 5
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- 229910000679 solder Inorganic materials 0.000 claims description 2
- 239000007921 spray Substances 0.000 claims 1
- 230000008859 change Effects 0.000 description 9
- 238000000197 pyrolysis Methods 0.000 description 7
- 238000002485 combustion reaction Methods 0.000 description 5
- 239000003610 charcoal Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
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- 230000007704 transition Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 206010020852 Hypertonia Diseases 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
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- 238000000418 atomic force spectrum Methods 0.000 description 1
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- 239000010951 brass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 229910001026 inconel Inorganic materials 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
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- 238000000253 optical time-domain reflectometry Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The present invention provides a kind of oxidant injection devices for Underground Coal Gasification Process, the oxidant injection device includes oxidant channel, the oxidant channel includes the rotary joint that air-tightness is connected in order each other, coiled tubing, mechanical shearing device and oxidant nozzle, wherein the mechanical shearing device is for cutting oxidant nozzle if necessary to recall coiled tubing, wherein the rotary joint is connected to ground oxidizer source with the central axis air-tightness of coiled tubing reel, even if thus continuing to injection oxidant during winding coiled tubing movement oxidant nozzle by coiled tubing reel.In addition, the application the present invention also provides this oxidant injection device in Underground Coal Gasification Process, is particularly used in the igniting and course of normal operation of Underground Coal Gasification Process.
Description
Technical field
The present invention provides a kind of oxidant injection devices for Underground Coal Gasification Process.Particularly, the present invention mentions
A kind of equipment that can be continuously injected into high concentration oxygen agent in Underground Coal Gasification Process has been supplied, this oxidant is additionally provided
Application of the injection device in Underground Coal Gasification Process is particularly used in the igniting and normal operating of Underground Coal Gasification Process
Process.
Background technique
Underground coal gasification(UCG) (UCG or ISC) process is in the presence of an oxidizer will by the burning of subterranean coal and gasification
Coal is converted into the process of product gas (also referred to as crude synthesis gas), and the product gas can be subsequently used for a variety of applications, including
Fuel production, chemicals production and power generation etc..The environmental requirement that is increasingly stringenter in view of mining industry and in view of relevant artificial
Cost and capital construction cost, this coal underground gasification technology suitable for most of coal deposits are undoubtedly very attractive.
For coal gasification course, no matter on the ground or underground carries out, wherein being all by following series of chemical
Convert coal, wherein H2O and CO2For main gasifying agent and O2For primary oxidizers:
C+O2→CO2(complete oxidation)
C+1/2O2→ CO (partial oxidation reaction)
C+H2O→H2+ CO (steam gasification reaction)
C+2H2→CH4(hydrogen gasification reaction)
C+CO2→ 2CO (carbon dioxide gasification reaction)
In Underground Coal Gasification Process, corresponding completion system is usually equipped in subterranean coal.The complete well system
System generally includes injection well for injecting various reagents such as oxidant, gasifying agent and coolant etc., for removing product gas
Output well and various service wells for helping out wherein usually are equipped with set in injection well, output well and service well
It pipe and/or internal lining pipe and communicates with each other as needed, wherein the service well generally includes ignition well, freezing well, barrier wells and anti-
Guide-well etc., wherein injection well is usually horizontal orientation well, and output well and service well typically horizontal orientation well or vertical
Well.
Therefore, in Underground Coal Gasification Process, most basic completion system is by communicating with each other and laid inside has casing
And/or the injection well and output well construction of internal lining pipe, also known as underground coal gasification(UCG) unit or well pair.
In Underground Coal Gasification Process, related subterranean zone includes combustion zone, gasification zone and pyrolysis zone, in which: burning
Area generally extends since oxidant and gasifying agent decanting point, and coal fires in the presence of oxidant and gasifying agent in combustion zone
It burns and gasifies；Gasification zone is located at combustion zone downstream or is centered around around combustion zone with radial, and coal is mainly by gas in gasification zone
Change and partial oxidation generates product gas；Pyrolysis zone is located at gasification zone downstream, and the pyrolysis of coal occurs in pyrolysis zone.For ideal coal
For charcoal underground gasification process, it is generally desirable to the pyrolysis of coal is as few as possible.With the gradually propulsion of Underground Coal Gasification Process, coal
The burned out area formed in layer becomes larger, and finally descends coal deposits to be consumed completely, only leaves coal ash.
In Underground Coal Gasification Process, product gas generated generally comprises CO, CO2、H2、CH4And solid particle, water,
Coal tar and hydrocarbon and a small amount of H2S、NH4With COS etc..The concrete composition of the product gas generally depends on Multiple factors, including institute
The presence (coal seam water or the water in surrounding formations infiltration coal seam) of the oxidant (such as air, oxygen-enriched air or pure oxygen), water that use,
The quality of coal and used technological parameter (temperature and pressure etc.).
In Underground Coal Gasification Process, normally tend to using the higher oxidant of oxygen concentration, because oxygen concentration is higher,
Product gas quality such as calorific value is higher.But oxygen concentration is too high must be simultaneously using coolant to avoid combustion if when being higher than 35vol%
Burning area's temperature is too high, intensity of flashing back is excessive and injects into well the danger that bushing pipe is burned.If it is possible to safely use
High concentration oxygen agent such as pure oxygen carries out Underground Coal Gasification Process and is necessarily advantageous.
In addition, can't usually be continuously injected into oxidant completely in Underground Coal Gasification Process.Particularly, when in coal
When needing to change oxidant injection phase in charcoal underground gasification process, usually to stop oxidant injection.For example, for rollback method
Underground Coal Gasification Process, wherein the oxidant injection phase that usually periodically to retract, such as the oxidation that retract after continuous gasification 30 days
50 meters of agent injection phase, and usually to stop oxidant injection in back off procedure.In this case, underground coal gasification(UCG)
Journey as a whole not really " continuous ", and it is this it is " discontinuous " necessarily cause product gas quality to fluctuate, when fluctuate compared with
When big problem will be brought for the subsequent applications of product gas.It therefore, if can be really continuous in Underground Coal Gasification Process
Injection oxidant is necessarily advantageous.
WO2014/043747A1 disclose it is a kind of for implementing the device and method of oxygen-enriched underground gasification process, specifically
For oxygen injection device and method, wherein injecting oxidant to subterranean coal using specially designed oxygen rifle, the oxygen rifle includes:
Gun body with inner passage is inserted with check-valves in the inner passage；The coiled tubing connector of gun body tail end, the engagement
There is the hole for leading to thermocouple on device；It is connected at least one section of spacer tube of gun body front end；It is connected to the injection nozzle of spacer tube front end；
With the thermocouple of monitoring injection nozzle temperature.Although referring to oxygen-enriched underground gasification in the patent, wherein being actually to infuse
Enter what air was operated.
WO2014/186823A1 discloses a kind of for supplying oxidant and water to coal seam in Underground Coal Gasification Process
Device and method, wherein the equipment includes oxidant channel and bobbin seal, the oxidant channel includes at least one well
Lower end aperture and at least one uphole end aperture, the downhole end aperture are used to inject to underground gasification area and aoxidize
Agent, for fluidly connecting with coiled tubing, described sleeve pipe is sealed for sealing oxidant channel and well for the uphole end aperture
Circular passage between hole sleeve, described sleeve pipe, which seals, has one or more for leading to underground gasification area injection water
Road.Although oxidant can be substantially pure oxygen in the patent, wherein using controlled rollback decanting point concept, this correspondence
Be the Underground Coal Gasification Process being spaced apart in the prior art by several retraction phases.
In short, in the prior art, the Underground Coal Gasification Process still has much room for improvement in some respects, specifically include:
The burning and gasification for how preferably controlling coal seam are to provide high quality of products gas；How oxidant injection is not being interrupted
In the case of realize oxidant injection device transfer or rollback；How under shaft bottom hot environment oxidant injection device is avoided
Damage and inject into well the melting of bushing pipe；And how to carry out underground monitoring preferably to control Underground Coal Gasification Process.
Therefore, there is still a need for further improvements for Underground Coal Gasification Process in the prior art, it is especially desirable to realize oxidant
Be continuously injected into and the safe handling of high concentration oxygen agent such as pure oxygen.
Summary of the invention
For the prior art, the present invention provides a kind of oxidant injection devices for Underground Coal Gasification Process.It is special
Not, the equipment that the present invention provides a kind of can be continuously injected into high concentration oxygen agent in Underground Coal Gasification Process, also mentions
Application of this oxidant injection device in Underground Coal Gasification Process has been supplied, Underground Coal Gasification Process is particularly used in
Igniting and course of normal operation.
The present invention provides a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant injection is set
Standby includes oxidant channel, and the oxidant channel includes the rotary joint that air-tightness is connected in order each other, coiled tubing, machine
Tool shear and oxidant nozzle, wherein the mechanical shearing device is for cutting oxidant nozzle if necessary with the company of recalling
Continuous oil pipe, and wherein the rotary joint is connected to ground oxidizer source with the central axis air-tightness of coiled tubing reel, thus
Even if continuing to injection oxidant during winding coiled tubing movement oxidant nozzle by coiled tubing reel.
The present invention also provides a kind of coal underground gasification methods, are used for coal underground gas wherein being equipped in subterranean coal
The completion system of change, wherein being continuously injected into high concentration oxygen to subterranean coal through injection well using oxidant injection device of the invention
Agent, wherein the high concentration oxygen agent is comprising at least 80vol% oxygen, the oxygen-enriched air of preferably at least 90vol% oxygen or pure
Oxygen, wherein also utilizing the coiled tubing by the oxidant injection device and injecting into well the auxiliary that the annular space between bushing pipe is formed
Coolant is injected in channel simultaneously, and the coolant is water, water vapour or carbon dioxide, and the coolant is used as coal gasification simultaneously at this time
The gasifying agent of process.
According to the present invention, the oxidant injection device is combined with the individual features and function of each component, especially rotates
Connector and coiled tubing are applied in combination, so that can not only be continuously injected into oxidation incessantly in Underground Coal Gasification Process
The Underground Coal Gasification Process of real continuous operation is realized in agent, and can be for example pure using high concentration oxygen agent with security and stability
Oxygen, it is hereby achieved that high quality and the stable product gas of quality, bring progress for the prior art.
According to the present invention, when carrying out Underground Coal Gasification Process using rollback method, since oxidation of the invention is utilized
Agent injection device, it is no longer necessary to the cumbersome disassembling operations of mobile oxidant nozzle in the case where interrupting oxidant injection, relatively
For operate it is more flexible and convenient, so as to substantially shorten prior art rollback method back-off period and/or retract away from
From, it might even be possible to realize the Underground Coal Gasification Process of the gasification substantially continuous movement in position in subterranean coal.
Therefore, it is proposed, according to the invention, the rollback method Underground Coal Gasification Process of short cycle small distance rollback may be implemented, it is described
Back-off period can substantially be foreshortened to two weeks by least 30 days of the prior art, or even be foreshortened to several days, more even foreshorten to 1
It, and the rollback distance can substantially foreshorten to 10 meters by 50 meters of the prior art, or even foreshorten to 5 meters, more even shorten
To 1 meter, it is possible thereby to realize the Underground Coal Gasification Process of the gasification substantially continuous movement in position in subterranean coal, this will undoubtedly make
The better quality of generated product gas and more stable brings progress for the prior art.
Detailed description of the invention
Below with reference to the accompanying drawings the present invention is further described, in which:
Fig. 1 gives the signal of a part located underground for injecting into well the oxidant injection device of the invention in bushing pipe
Figure；
Fig. 2 gives the signal for implementing Underground Coal Gasification Process ignition operation using oxidant injection device shown in Fig. 1
Figure, wherein igniter is connected on oxidant nozzle and (has removed the pneumatic protection plug on oxidant nozzle)；
Fig. 3 gives the schematic diagram of coal underground gasification method of the invention (containing ground and subsurface equipment).
In the drawings, identical appended drawing reference refers to same parts.Specifically, appended drawing reference meaning involved in each attached drawing
It is as follows:
1, inject into well bushing pipe；2, boot band；3, pneumatic protection plug；4, oxidant nozzle；5, distributed temperature, pressure
It (is separately fixed at and injects into well outside bushing pipe and on coiled tubing outer wall) with sonic sensor；6, mechanical shearing device；7, only
Return valve；8, coiled tubing external grapples connector；9, accessory channel (by coiled tubing and injects into well the annular space shape between bushing pipe
At)；10, oxidant channel；11, coiled tubing；12, gasification zone direction；13, igniter；14, casing is injected；15, well head
Coolant/air inlet；16, the spare coolant inlet of well head；17, well head controls equipment；18, coiled tubing reel (in
Connection instrument and data transmission link in mandrel)；19, rotary joint；20, ground oxidizer source pipeline.
Specific embodiment
The present invention provides a kind of oxidant injection devices for Underground Coal Gasification Process.Particularly, the present invention mentions
A kind of equipment that can be continuously injected into high concentration oxygen agent in Underground Coal Gasification Process has been supplied, this oxidant is additionally provided
Application of the injection device in Underground Coal Gasification Process is particularly used in the igniting and normal operating of Underground Coal Gasification Process
Process.
According to the present invention, a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant are provided
Injection device includes oxidant channel, and the oxidant channel includes the rotary joint of air-tightness connection, continuous in order each other
Oil pipe, mechanical shearing device and oxidant nozzle, wherein the mechanical shearing device for cutting oxidant nozzle if necessary
To recall coiled tubing, and wherein the rotary joint connects the central axis air-tightness of ground oxidizer source and coiled tubing reel
It is logical, even if thus continuing to injection oxidation during winding coiled tubing movement oxidant nozzle by coiled tubing reel
Agent.
According to the present invention, in the oxidant injection device, the rotary joint is suitable for pure oxygen in high pressure environment
Leakproofness rotary joint is realized airtight between ground oxidizer source and coiled tubing drum center axis using the rotary joint
Property connection, so as to by coiled tubing reel wind coiled tubing move oxidant nozzle during continue to inject
Oxidant, such as when withdrawing oxidant nozzle using coiled tubing in rollback method Underground Coal Gasification Process, the rotary joint
It still can ensure that being continuously injected into for high concentration oxygen agent such as pure oxygen, to realize Underground Coal Gasification Process in time continuous
Property.
According to the present invention, in the oxidant injection device, the rotary joint can be to be applied in the prior art
Any suitable leakproofness rotary joint, such as rotary joint disclosed in US3884511 and CN104279385B passing through
It crosses and may be used for the present invention after being adaptively adjusted, these patents are described herein by reference full text and introduce.
According to the present invention, in the oxidant injection device, the coiled tubing is the main composition of oxidant channel
Part reaches the predetermined position in subterranean coal mainly for delivery of oxidant and transfer oxidant nozzle and ignition installation.
According to the present invention, in the oxidant injection device, coiled tubing uses special connector such as external grapples
Connector is effectively connect with other components, and this connector is that non-solder mode connects and can provide airtight sealing, such as
Therefore good sealing is provided within the scope of operating pressure easily can replace and repair using this external grapples connector
Other components in oxidant channel.
Coiled tubing be height air-tightness component, it is possible thereby to avoid high concentration oxygen agent such as pure oxygen in use by
The safety problem caused by leakage etc..Coiled tubing is generally wound on coiled tubing reel, by continuous under job state
Oil pipe reel winding is realized the release of coiled tubing and is withdrawn.Central axis, the central axis and company are equipped on coiled tubing reel
Continuous oil pipe body interior connection, above-mentioned rotary joint is exactly that the central axis through coiled tubing reel makes oxidizer source and coiled tubing
Body interior is connected to and is achieved in the oxidant without interruption during coiled tubing reel winds coiled tubing.
The selection of coiled tubing and its reel extends length it is ensured that coiled tubing can arrive at wellhole inside coal seam and coal seam
Degree.The outer diameter of coiled tubing is generally selected according to the pressure drop of precalculated static hydraulic flow and permission.Continuous oil
The material and wall thickness of pipe generally according to the property of coolant used, the expected Underground Coal Gasification Process cycle of operation, it is estimated into
The number of subterranean coal and oxidizer flow rate etc. are selected out, 316L stainless steel or more advanced material can be used generally with full
It its corrosion-resistant, resistant to corrosion of foot and anti-oxidant etc. requires.
Temperature, pressure and sonic sensor can be arranged on coiled tubing outer wall, the terminal of these sensors is generally set
It sets in the central axis of coiled tubing reel, thus the test point of these sensors can extend and be distributed always with coiled tubing
It is generally equipped with radio transmitting device to subterranean coal, and inside coiled tubing reel, passes measured signal back control
System.The central axis of coiled tubing reel generally also will be designed and manufactured specially and thoroughly be cleaned to meet high concentration oxygen agent such as
The requirement of pure oxygen environment.
According to the present invention, in the oxidant injection device, the mechanical shearing device is one kind from breaking mechanism, is used for
Oxidant nozzle is cut if necessary to recall coiled tubing, such as in oxidant nozzle since failure such as deforms or distort quilt
Be stuck in inject into well in bushing pipe or due to inject into well bushing pipe melting and be stuck can not move when, then optionally can be
Continue operation after maintenance and/or replacement oxidant nozzle.
Due to combining mechanical shearing device, it can be ensured that most of component of oxidant injection device is if necessary such as oxygen
Agent nozzle can be withdrawn ground with on-call maintenance and/or replacement, to reduce coal to a certain extent after breaking down
Equipment loss in charcoal underground gasification process.
According to the present invention, in the oxidant injection device, in the coiled tubing and machinery in oxidant channel
One or more check-valves can also be connected between shear, plurality of check-valves is mainly used for spare, the non-return
Valve is mainly used for that inverted draft is prevented to enter coiled tubing, so that associated components keep cleaning and on ground in oxidant injection device
Face well head removes or provides when withdrawing equipment safeguard protection, and the check-valves can be known to those skilled in the art suitable for height
Any kind of check-valves of concentration oxidizer such as pure oxygen environment, such as can be spring stop valve or ball+spring type etc..
It is oxidant nozzle, oxidant in oxidant channel end in the oxidant injection device according to the present invention
Thus distribution enters subterranean coal.Therefore, oxidant nozzle is the critical component of oxidant injection device of the invention, generally also
It is that position occurs for failure, it is necessary to careful design and use.
According to the present invention, the oxidant nozzle must adapted to be high temperature, high pressure and swiftly flowing high concentration
The hot environment of oxidant such as pure oxygen environment and subterranean coal thereabout；The material of the oxidant nozzle must be appropriate
Selection, such as can be selected from brass, inconel and Monel etc.；The outer shape of the oxidant nozzle
It must smoothly transition from as far as possible, i.e. its any external dimensions variation progressive formation for being all gradually transition, so as to infusing
Enter and smoothly moved in well internal lining pipe, and the oxidant nozzle there will be enough wall thickness, to provide contact area and intensity
Meet simultaneously heat dissipation and it is cooling require, and resist be likely to occur any and flash back, thereby guarantee that oxidant nozzle integrality and
Reliability.
According to the present invention, the inner passage of the oxidant nozzle will be suitble to high concentration oxygen agent such as pure oxygen to flow, described
Inner passage must be clean, cannot have particle or hydrocarbon pollution, and the interior channel surface is typically passed through and meets
The special processing of pure oxygen job requirements；In addition, the outer diameter of the oxidant nozzle be also designed to it is adjustable, it is possible thereby to
The stream for injecting into well the annular space between bushing pipe and oxidant nozzle to control coolant is adjusted by adjusting oxidant nozzle od
Speed, and then accelerate or slow down to take away heat from oxidant nozzle.
According to the present invention, the oxidant nozzle can be the nozzle head with one or more holes, wherein having one
The pore size of the single-hole nozzle head in hole is typically based on the maximum jet velocity in outlet and determines, and maximizes jet velocity and be conducive in oxygen
It carries more coolants in agent stream secretly and is directly entered gasification zone, and multiple holes of the jet rose head with multiple holes can be in
The heart and peripheral distribution, wherein each hole in periphery parallel with centre bore can make the oxidant sprayed inject in a manner of narrow focusing
It can angularly be dissipated outside according to the angled such as 5-35 ° of angle of centre bore, preferably 8-20 ° to each hole in gasification zone or periphery,
So that the oxidant sprayed enters gasification zone with bigger covering surface；In addition, the oxidant nozzle can also be in nozzle head end
It, specifically can be close to nozzle head end 2- nearby plus for example miniature venturi lines of miniature water conservancy diversion lines that specially designs
Miniature venturi lines is equipped at 20mm, preferably 3-15mm, for guiding coolant to reach the hole on the nozzle head to implement
Cooling protection.
According to the present invention, the oxidant nozzle can also generally be justified with pneumatic protection plug, the pneumatic protection plug
Shape is placed on oxidant nozzle tip, can when starting to inject oxidant for protecting oxidant nozzle under non-job state
To be blown off by hyperbaric oxygen agent stream without hindering oxidant injection.
According to the present invention, in the Underground Coal Gasification Process using rollback method, the oxidant nozzle can pass through company
Continuous oil pipe reel winding coiled tubing and determine distance injecting into well periodically to retract in bushing pipe, so as to by injection well liner
Underground coal deposits around pipe all consumes paragraph by paragraph, only leaves coal ash.
The present invention also provides a kind of coal underground gasification methods, are used for coal underground gas wherein being equipped in subterranean coal
The completion system of change, wherein being continuously injected into high concentration oxygen to subterranean coal through injection well using oxidant injection device of the invention
Agent, wherein the high concentration oxygen agent is comprising at least 80vol% oxygen, the oxygen-enriched air of preferably at least 90vol% oxygen or pure
Oxygen, wherein also utilizing the coiled tubing by the oxidant injection device and injecting into well the auxiliary that the annular space between bushing pipe is formed
Coolant is injected in channel simultaneously, and the coolant is water, water vapour or carbon dioxide, and the coolant is used as coal gasification simultaneously at this time
The gasifying agent of process.
Therefore, when carrying out underground coal gasification(UCG) using oxidant injection device of the invention, coiled tubing and injection well
Annular space between internal lining pipe may be used as accessory channel, and in addition to coolant, which be can be also used for when needed to ground
Reagent needed for lower coal seam injection is other, wherein reagent needed for other may include such as gasifying agent and igniting oxidant.
According to the present invention, in the coal underground gasification method, the cold of subterranean coal is injected by the accessory channel
But agent mainly has following functions: the heat that can be acted on around removal oxidant nozzle by heat exchange avoids oxidant nozzle temperature
It is excessively high；When carrying out withdrawing oxidant nozzle using coiled tubing in Underground Coal Gasification Process using rollback method, can pass through
The injection flow of coolant is reduced, such as reduces coolant flow 10-80%, accelerates to inject into well bushing pipe in front of oxidant nozzle
Partial burn rate；With when using water or water vapour or carbon dioxide as coolant, they can as coal simultaneously
The gasifying agent of lower gasification.
For example, it will be converted into water near oxidant nozzle and in the gasification zone of downstream when using water as coolant
Steam, at this time can be by control water vapour ratio come control process temperature, so that solid (carbon), the liquid of hydrocarbon-containiproducts
(volatile matter and pyrolysis liquids of coal) and gas (coal bed gas, pyrolysis steam and synthesis gas) more gasified (partial oxidation) and
Non-burning (complete oxidation).
According to the present invention, in the coal underground gasification method, using comprising at least 80vol% oxygen, preferably at least
For the oxygen-enriched air or pure oxygen of 90vol% oxygen as oxidant, it is higher that this high concentration oxygen agent can provide quality such as calorific value
Product gas, but condition is must to use coolant simultaneously, the coolant can be water, water vapour or carbon dioxide, preferably
Water or carbon dioxide, these coolants can be used as the gasifying agent of coal gasification course simultaneously, thus optimize entire coal underground gas
Change process.
According to the present invention, in the coal underground gasification method, it is preferable to use pure oxygen as oxidant and using water or
Carbon dioxide is as coolant, and the coolant and pure oxygen are preferably injected with certain molar ratio at this time, specifically, as cooling
The water or carbon dioxide and the molar ratio of the pure oxygen as oxidant injection of agent injection can be 0.5-6.0, preferably 1.0-
5.0, and more preferably 1.5-4.0.
According to the present invention, in the coal underground gasification method, in injection well vertical section jacket exterior, injection well liner
It can be respectively fixed with temperature, pressure and sonic sensor outside pipe, on coiled tubing outer wall and oxidant nozzle, for obtaining
It takes temperature, pressure and the acoustic signals of subterranean coal and feeds back to the control system near well head.
According to the present invention, the temperature, pressure and sonic sensor all can be based on fiber optical time domain reflection measuring technique
The distributed induction optical fiber of (Optical Time-Domain Reflectometry--OTDR), the optical fiber can be by well
Near mouthful or the central axis of coiled tubing reel starts to extend to target measurement point, to obtain corresponding temperature curve, pressure
Force curve and sound wave curve are used to monitor the temperature of oxidant injection phase, burning zone position, subterranean coal Expenditure Levels, gasification zone
Degree and pressure and well system integrity etc., so that controlling Underground Coal Gasification Process and temperature sensor can also be double gold
Belong to sheath K-type dual probe thermocouple, such as can additionally or alternatively use bimetallic sheath K-type is double to visit at oxidant nozzle
Head thermocouple, to obtain the temperature and control coolant flow based on the temperature.
Specifically, it is proposed, according to the invention, the function of each temperature, pressure and sonic sensor is described as follows:
The temperature, pressure and sonic sensor of injection well vertical section jacket exterior are fixed on mainly as safety system
Data source, temperature is excessively high, hypertonia is (such as when the position temperature and/or pressure reach critical value or more than setting
When counting safety value) when, it can automatic cut-off system operation；
Temperature, pressure and the sonic sensor injected into well outside bushing pipe is fixed on to be mainly used for monitoring gas in subterranean coal
Change the temperature and pressure in area, these sensors generally extend to gasification zone through the instrument port near the well head of ground, and will
Measurement feedback is to control system and is stored into database, generally, when gasification zone temperature > 600 DEG C, for example, 600-1200
DEG C when, it is believed that gasified along the coal seam for injecting into well bushing pipe, and coal then mainly occurs for when temperature is higher than 1,200 DEG C
Burning also can automatic cut-off system operation in addition when being all consumed along the subterranean coal for injecting into well bushing pipe；
Temperature, pressure and the sonic sensor being fixed on coiled tubing outer wall can be from the central axises of coiled tubing reel
Oxidant nozzle is extended to, these sensors are connect with radio transmission apparatus, simultaneously to control system by measurement feedback
Be stored into database, wherein temperature and pressure sensor be mainly used for monitor coiled tubing on Temperature Distribution, oxidant nozzle
The pressure of gasification zone and sonic sensor are mainly used to confirm the position of oxidant nozzle, control in the temperature and subterranean coal at place
System processed can cope at any time relevant issues based on acoustic signals to ensure that well system is complete；With
Bimetallic sheath K-type dual probe thermocouple can also be fixed, additionally or alternatively on oxidant nozzle to obtain
The temperature simultaneously injects flow based on temperature control coolant.
It may be implemented based on the temperature, pressure and sound wave signal acquiring system designed as described above to whole according to the present invention
The good control of a Underground Coal Gasification Process.
According to the present invention, for the completion system being located in the ground in coal seam, well system (including injection well and output
Well) internal lining pipe can be linked together using any suitable connection mode commonly used in the art, such as can be using weldering
Connect, screw thread, clip groove, flange, cutting ferrule or card pressure etc. connection types, the principle followed be to ensure that final completion system performance
It is best.
According to the present invention, for the completion system, injecting into well bushing pipe is critically important component part, its function
It can intact be the important guarantee that entire Underground Coal Gasification Process is gone on smoothly.
Specifically, inject into well the function major embodiment of bushing pipe in the following areas: firstly, injecting into well bushing pipe is coal
The important channel of fluid flowing and equipment such as oxidant nozzle movement in lower gasification；Secondly, injecting into well bushing pipe and coal seam
Annular space between drilling also can be used as flow channel after with inert gas purge, for example, if coal seam very drying and/or gasification
When process needs more gasifying agents, additional gasifying agent can be injected by the channel；Again, in order to monitor the consumption of subterranean coal
Position and related process parameters, can on injecting into well bushing pipe outer wall stationary distribution formula temperature, pressure and sonic sensor, with
Corresponding temperature, pressure and sound wave profile distribution curve are provided.
According to the present invention, the material for injecting into well bushing pipe can generally be selected according to subsurface formations lithostatic pressure and hydrostatic pressing；
Inject into well maximum outside diameter of the internal diameter of bushing pipe generally with oxidant nozzle to match, when oxidant nozzle od is adjustable,
Coolant flow speed can be controlled by adjusting annular space between the two, so as to accelerating or slow down from oxidant nozzle and its
Surrounding takes away heat；Inject into well the annular space between bushing pipe inner wall and coiled tubing and be generally basede on the determination of coolant maximum stream flow,
To meet coolant flow requirement；It usually extends to bushing pipe is injected into well near the bottom of subterranean coal and that may be present
Above dirt band layer, generally, injecting into well bushing pipe will be as close possible to the bottom in underground coal seam, but cannot jump out under the entrance of coal seam
Rock stratum is lied prostrate, when there are dirt band layer, to be located above dirt band layer, preferably there is about 1 between the internal lining pipe and dirt band layer at this time
The thick continuous coal seam of rice, no coal seam thickness are preferably less than 15 centimetres, and more preferably less than 10 centimetres.
According to the present invention, injecting into well bushing pipe and output well internal lining pipe will generally cross each other in end, and cross
Section inject into well bushing pipe and output well internal lining pipe will aperture, so that generated product gas is entered by injecting into well bushing pipe
It output well internal lining pipe and is finally removed by output well.
In this case, for injecting into well for bushing pipe and output well internal lining pipe, aperture segment length can respectively solely
It is on the spot the complete pipeline section of 1-3, preferably 2, open pore size is generally 5-35mm, preferably 10-25mm, between the aperture generally interlocks
Every the 5-35%, preferably 10-30% that arrangement and the aperture gross area can be aperture section tube wall area；In addition, wherein completely to manage
Section meter is generally starting aperture apart from least 0.5 meter of box cupling at a distance, in favor of keeping the intensity of entire pipeline section.
According to the present invention, the coal underground gasification method preferably uses rollback method to carry out.In this case, the gas
Change process is usually since close to the position of output well liner tube end, wherein initially by configuring in oxidant nozzle-end
Pneumatic device interface (usually has predetermined Pneumatic pressure), and igniter is connected on oxidant nozzle and is transplanted on predetermined point
Fiery position, later using oxidant stream or pressure activation with starting ignition, wherein the igniter is generally opened with delayed mode
It is dynamic, to provide time enough rollback oxidant nozzle away from ignition location and reach home, thus far from igniting
The high-energy and high heat that device discharges when lighting a fire, and wherein in ignition phase, also by by coiled tubing and injection well liner
Accessory channel the injection air such as≤300Nm that annular space between pipe is formed3The low discharge air of/h be used as igniting oxidant, and
After the completion of igniting, then stops injecting air and start to inject coolant, while oxidant is injected by oxidant channel.
Successfully start coal underground lighting a fire when carrying out Underground Coal Gasification Process using rollback method according to the present invention
After gasification, generally periodically winding coiled tubing by coiled tubing reel continues the determining distance of oxidant nozzle rollback
The gasification, and the operating flexibility and oxidant due to oxidant injection device of the present invention inject continuity, wherein returning
Moving back period and rollback distance can substantially shorten, such as it is 1 day that back-off period, which can achieve most short, it is possible thereby to retract daily
1-10 meters, preferably 1-5 meters of oxidant nozzle and more preferably 1-3 meters change the gasification position in subterranean coal, and can be
Injection oxidant such as pure oxygen and coolant are continued in oxidant nozzle back off procedure, to realize that Underground Coal Gasification Process exists
It is temporal really continuous and substantially continuous in subterranean coal space.
According to the present invention, when carrying out Underground Coal Gasification Process using rollback method, in oxidant nozzle back off procedure,
Coolant flow and/or increasing can be correspondingly reduced based on material, wall thickness and its prediction burning velocity for injecting into well bushing pipe
Oxidant such as pure oxygen flow, such as can reduce coolant flow 10-80% and/or increase pure oxygen flow 10-20%, to accelerate
The burn rate of liner portion is injected into well in front of oxidant nozzle, is used to gasify to quickly expose fresh coal seam, this
A process will be continued for until being consumed completely along the subterranean coal for injecting into well bushing pipe.
Therefore, it is proposed, according to the invention, the improvement of entire oxidant injection device is realized to Underground Coal Gasification Process
Effective control.
The embodiment that it will be convenient to further describe the present invention with respect to the accompanying drawings.
Fig. 1 gives the schematic diagram for being located at a part for injecting into well the oxidant injection device of the invention in bushing pipe.
In Fig. 1, oxidant nozzle 4 is connected with mechanical shearing device 6, which guarantees that oxidant nozzle is stuck in injection
Oxidant nozzle can be disconnected when in well internal lining pipe 1 so that equipment rest part is recalled ground；Mechanical shearing device 6 and check-valves 7
It is connected, the check-valves is for preventing inverted draft from entering coiled tubing, to avoid the equipment contaminated and in ground well head
Safeguard protection is provided when removing or withdraw equipment；Check-valves 7 is connected with coiled tubing 11 through external grapples connector 8；It is distributed
Temperature, pressure and sonic sensor 5, which are separately fixed at, to be injected into well outside bushing pipe and on coiled tubing outer wall, to provide entire coal
The hot active signal of charcoal underground gasification process, along the coal consumption situation in gasification zone direction 12 and the position of oxidant nozzle 4；
When oxidant injection device enters underground, the pneumatic protection plug 3 for being mounted on 4 front end of oxidant nozzle can prevent pollutant from invading
Enter oxidant nozzle, and is conducive to entire oxidant injection device and smoothly moves；It is oxidant channel 10 in coiled tubing,
Enter gasification zone after middle oxidant stream to oxidant nozzle 4；The annular space between bushing pipe and coiled tubing is being injected into well for auxiliary
Channel 9 provides cooling wherein coolant can be passed through for oxidant nozzle, can also be passed through gasifying agent.
Fig. 2 gives the signal for implementing Underground Coal Gasification Process ignition operation using oxidant injection device shown in Fig. 1
Figure.As shown in Fig. 2, wherein the pneumatic protection plug 3 in Fig. 1 is removed, and the igniter for pressure activation/pneumatically separate can be passed through
13 are connected on oxidant nozzle.In this embodiment, first with oxidant injection device of the invention igniter
13 are transported to predetermined ignition position, and are then lighted a fire by the activation of injection oxidant stress and disconnection igniter 13.
Fig. 3 gives the schematic diagram of coal underground gasification method of the invention (containing ground and subsurface equipment).Such as Fig. 3 institute
Show, wherein implementing Underground Coal Gasification Process using oxidant injection device shown in FIG. 1, wherein coiled tubing 11 is through continuous
Oil pipe reel 18 discharges, will be in the case where well head control equipment 17 is controlled by injecting into well bushing pipe 1 inside injection casing 14
Connected oxidant nozzle be sent to gasification zone；The starting point of coiled tubing 11 (figure in the central axis of coiled tubing reel 18
In be not shown)；Rotary joint 19 connects the oxidizer source pipeline 20 on ground and the starting point of coiled tubing 11, which can
To ensure to continue to injection oxidant during coiled tubing reel winds coiled tubing.
The invention is not limited to embodiments described above, and for those skilled in the art, the present invention may be used also
To have various change and adjustment, without departing from the spirit and principles in the present invention, the variation and adjustment should all be in models of the present invention
In enclosing.
Claims (17)
1. a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant injection device includes that oxidant is logical
Road, the oxidant channel include rotary joint, coiled tubing, mechanical shearing device and the oxygen that air-tightness is connected in order each other
Agent nozzle, wherein the mechanical shearing device for cutting oxidant nozzle to recall coiled tubing, and wherein if necessary
The rotary joint is connected to ground oxidizer source with the central axis air-tightness of coiled tubing reel, even if thus by continuous
Injection oxidant is continued to during the mobile oxidant nozzle of oil pipe reel winding coiled tubing.
2. the oxidant injection device of claim 1, wherein the oxidant channel further include be connected to the coiled tubing and
One or more check-valves between mechanical shearing device, for preventing inverted draft from entering coiled tubing.
3. the oxidant injection device of claims 1 or 2, wherein the coiled tubing passes through outside in the oxidant channel
Grapple connector is effectively connect with other components, and the external grapples connector realizes that non-solder connection and offer air-tightness are close
Envelope.
4. the oxidant injection device of claims 1 or 2, wherein the inner passage of the oxidant nozzle is suitble to high concentration oxidation
Agent flowing, the adjustable and described oxidant nozzle of the outer diameter of the oxidant nozzle also has pneumatic protection plug, for protecting oxygen
It agent nozzle and is blown off when starting and injecting oxidant by hyperbaric oxygen agent stream.
5. the oxidant injection device of claim 4, wherein the oxidant nozzle is the nozzle head with one or more holes,
Wherein the pore size of the single-hole nozzle head with a hole is determined based on maximum jet velocity is exported, the porous spray with multiple holes
Multiple holes of mouth by center and each hole of peripheral distribution and periphery it is parallel with centre bore or according to centre bore at 5-35 ° angularly outside
Diverging and the nozzle head are being equipped with miniature venturi lines close at the 2-20mm of its end, for guiding coolant to reach institute
The hole on nozzle head is stated to implement cooling protection.
6. the oxidant injection device of claim 5, wherein multiple holes of the jet rose head with multiple holes are by center and outside
Week distribution and each hole in periphery and centre bore according to centre bore at 8-20 ° of angular outer diverging and the nozzle head close to its end
It is equipped with miniature venturi lines at portion 3-15mm, implements cooling guarantor for guiding coolant to reach the hole on the nozzle head
Shield.
7. a kind of coal underground gasification method, wherein the completion system for underground coal gasification(UCG) is equipped in subterranean coal,
The middle oxidant injection device using any one of claim 1-6 is continuously injected into high concentration oxidation to subterranean coal through injection well
Agent, wherein the high concentration oxygen agent is oxygen-enriched air or pure oxygen comprising at least 80vol% oxygen, wherein also utilizing by the oxygen
The coiled tubing of agent injection device and the accessory channel for injecting into well the annular space formation between bushing pipe inject coolant simultaneously, institute
Stating coolant is water, water vapour or carbon dioxide, and the coolant is used as the gasifying agent of coal gasification course simultaneously at this time.
8. method for claim 7, wherein in injection well vertical section jacket exterior, injecting into well outside bushing pipe, outside coiled tubing
Be respectively fixed with temperature, pressure and sonic sensor on wall and oxidant nozzle, for obtain the temperature of subterranean coal, pressure and
Acoustic signals simultaneously feed back to the control system near well head.
9. method for claim 8, wherein the temperature, pressure and sonic sensor are to measure skill based on fiber optical time domain reflection
The distributed induction optical fiber of art, the optical fiber is by extending to target near well head or the central axis of coiled tubing reel
Measurement point, and bimetallic sheath K-type dual probe thermocouple is additionally or alternatively used in oxidant nozzle exit, it is somebody's turn to do with obtaining
Point temperature simultaneously injects flow based on temperature control coolant.
10. the method for any one of claim 7-9, wherein injecting into well the internal diameter and oxidant nozzle maximum outside diameter of bushing pipe
Match, the annular space between inner wall and coiled tubing is determined based on coolant maximum stream flow, and is injected into well bushing pipe and extended to underground
Bottom is nearby and above dirt band layer that may be present.
11. the method for any one of claim 7-9, wherein inject into well bushing pipe and output well internal lining pipe crosses in end, and
The section that crosses injects into well bushing pipe and the equal aperture of output well internal lining pipe, in favor of generated product gas by inject into well bushing pipe into
Enter output well internal lining pipe and is finally removed by output well.
12. the method for claim 11, wherein the aperture segment length injected into well on bushing pipe and output well internal lining pipe is respectively independent
Ground is 1-3 complete pipeline sections, and open pore size 5-35mm, the aperture is staggeredly intervally arranged and the aperture gross area is aperture section
The 5-35% of tube wall area.
13. the method for claim 12, wherein the aperture segment length injected into well on bushing pipe and output well internal lining pipe is respectively independent
Ground is 2 complete pipeline sections, and open pore size 10-25mm, the aperture is staggeredly intervally arranged and the aperture gross area is aperture section pipe
The 10-30% of wall area.
14. the method for any one of claim 7-9, wherein using pure oxygen as oxidant and using water or carbon dioxide as cold
But agent is 0.5-6.0 as the water or carbon dioxide of coolant injection and the molar ratio of the pure oxygen as oxidant injection.
15. the method for claim 14, wherein carry out Underground Coal Gasification Process using rollback method, the gasification is from close
The position of output well liner tube end starts, wherein initially by the pneumatic device interface that configured in oxidant nozzle-end by point
Fiery device is connected on oxidant nozzle and is transplanted on predetermined ignition position, later using oxidant stream or pressure activation to postpone
Mode starting ignition, to provide time enough rollback oxidant nozzle away from ignition location and reach home, and
Wherein it is used as igniting oxidant using accessory channel injection air in ignition phase.
16. the method for claim 15, wherein periodically passing through coiled tubing after lighting a fire and successfully starting Underground Coal Gasification Process
Reel winding coiled tubing makes oxidant nozzle retract determining distance to continue the gasification, and wherein back-off period is most short is
1 day, and it is 1 meter that the distance that retracts every time is most short, and injection pure oxygen and cooling are wherein continued in oxidant nozzle back off procedure
Agent, to realize the continuous operation of Underground Coal Gasification Process.
17. the method for claim 16, wherein in oxidant nozzle back off procedure, based on material, the wall for injecting into well bushing pipe
Thick and its prediction burning velocity correspondingly reduces coolant flow and/or increases pure oxygen flow, to accelerate in front of oxidant nozzle
The burn rate of liner portion is injected into well, to expose fresh coal seam for gasifying.
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| CN106761653B (en) * | 2017-01-12 | 2023-03-14 | 中为(上海)能源技术有限公司 | Nozzle equipment for coal underground gasification process and operation method thereof |
| CN108518211B (en) * | 2018-03-29 | 2024-01-30 | 中为(上海)能源技术有限公司 | Oxidant mixed injection system for underground coal gasification process and operation method |
| CN111456645B (en) * | 2019-01-22 | 2022-05-10 | 中国石油天然气股份有限公司 | Continuous oil pipe connector |
| CN112431582B (en) * | 2020-12-10 | 2022-06-21 | 上海飞舟博源石油装备股份有限公司 | Underground coal gasification system and method capable of realizing parallel transportation of multiple media |
| CN115467648B (en) * | 2022-08-31 | 2024-04-05 | 西安石油大学 | Underground non-oxygen gasification method for coal by microwave energy |
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| CN102287177A (en) * | 2011-08-19 | 2011-12-21 | 秦勇 | Method for gasifying underground coal |
| CN103742122B (en) * | 2014-01-28 | 2017-09-19 | 新奥科技发展有限公司 | Underground coal gasification system and gasification process |
| CN104018819B (en) * | 2014-06-09 | 2017-11-14 | 新奥科技发展有限公司 | Firepower insertion method, pass-through facility between underground gasification Vertical Well |
| CN104018820B (en) * | 2014-06-16 | 2017-01-04 | 北京中矿科能煤炭地下气化技术研究中心 | A kind of coal underground gasifying technology system |
| CN203948081U (en) * | 2014-06-16 | 2014-11-19 | 北京中矿科能煤炭地下气化技术研究中心 | A kind of without the underground coal gasification(UCG) igniting of well formula and injection point backing device |
| CN206053927U (en) * | 2016-08-24 | 2017-03-29 | 中为(上海)能源技术有限公司 | For the oxidant injection device of Underground Coal Gasification Process |
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