CN106121619B - Ignition installation and its application for Underground Coal Gasification Process - Google Patents
Ignition installation and its application for Underground Coal Gasification Process Download PDFInfo
- Publication number
- CN106121619B CN106121619B CN201610716989.5A CN201610716989A CN106121619B CN 106121619 B CN106121619 B CN 106121619B CN 201610716989 A CN201610716989 A CN 201610716989A CN 106121619 B CN106121619 B CN 106121619B
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- well
- ignition
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- packet
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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
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23Q—IGNITION; EXTINGUISHING-DEVICES
- F23Q13/00—Igniters not otherwise provided for
Abstract
The present invention provides a kind of ignition installations for Underground Coal Gasification Process, additionally provide application of this ignition installation in Underground Coal Gasification Process ignition phase.Ignition installation of the invention includes the conveying device being linked in sequence each other, disconnects device, igniter fuse and one or more fuel packet, plurality of fuel packet and be one another in series, and wherein: the conveying device is coiled tubing, conjugation tube or integrated signal cable；The igniter fuse is extended through one or more fuel packets and for one or more fuel packet that ignited since equipment end with delayed mode；The disconnection device disconnects after starting ignition fuse, thus withdraws ignition installation component including conveying device to as little as home；With include thermite and for lighting subterranean coal after being ignited in the fuel packet.
Description
Technical field
The present invention provides a kind of ignition installations for Underground Coal Gasification Process, additionally provide this ignition installation and exist
Application in Underground Coal Gasification Process ignition phase.
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.
In Underground Coal Gasification Process, corresponding completion system is usually equipped in subterranean coal.The complete well system
System generally include for inject various reagents such as oxidant (such as air, oxygen-enriched air or pure oxygen), gasifying agent and coolant (water,
Water vapour and carbon dioxide can be used as gasifying agent and coolant simultaneously, and air also can be used as coolant) etc. injection well, for moving
Various service wells except the output well of product gas and for helping out, wherein in injection well, output well and service well usually
Be equipped with casing and/or internal lining pipe and communicate with each other as needed, wherein the service well generally include ignition well, freezing well,
Barrier wells and protection well etc., wherein injection well is usually horizontal orientation well, and output well and service well are typically horizontal fixed
To 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.).
Start Underground Coal Gasification Process to light subterranean coal, needs in oxidant such as air, oxygen-enriched air or pure
In the presence of oxygen, subterranean coal is heated to ignition point.Various coals for example lignite, bituminous coal, anthracite, coke ignition point be generally
400-700℃.After oxidant is sufficient and temperature reaches ignition point, it is no longer necessary to which external heating, coal seam can pass through own combustion
To maintain entire burning/gasification.
Therefore, in the ignition phase of Underground Coal Gasification Process, light subterranean coal and be allowed to sustained combustion need fuel,
Heat and oxidant, wherein coal to be gasified itself can be used as fuel, initial heat is including outer usually from external source
The heat that fiery fuel combustion of adding some points generates, oxidant such as air or oxygen is generally also by externally supplying.
In Underground Coal Gasification Process, subterranean coal is safely and efficiently lighted in the case where keeping well system integrity
It is extremely important, but in the prior art, there are still problems and needs in many aspects for the ignition phase of Underground Coal Gasification Process
It improves.
Specifically, in terms of fuel, igniter fuel commonly used in the prior art such as boron triethyl (TEB, (C2H5)3) or silicon B
Alkane (SiH4) or they and lower carbon number hydrocarbons such as methane, ethane, propane etc. the mixture usually meeting when being exposed to air or oxygen
It reacts, it is inadequate to use safety, and dirt band layer that may be present is also unfavorable for coal seam igniting in subterranean coal；In heat
Amount aspect, the initial heat that injecting into well bushing pipe and/or casing may influence when lighting a fire focus on target coal seam, and wetter coal seam needs
It wants more heat of vaporization moisture and makes ignition difficulties, also to keep output well temperature to prevent coal volatile matter and coal in ignition process
Thermal decomposition product heavy constituent (such as tar, pitch) condensation leads to output well plugging；In addition, oxidant introducing and use and
There are also problems or defect for the selection of equipment and configuration aspect.
If it is possible to be further improved igniter fuel to provide more initial heats and further improvement or optimization
Well system configuration is to make full use of the initial heat to be necessarily advantageous.
WO2014/089603A1 discloses a kind of equipment for subterranean coal igniting, as shown in its attached drawing 1, midpoint
Fiery equipment is mixing chamber 40 between entrance 15 and outlet 17, includes igniter fuel and oxidant mixture, institute in the mixing chamber
Stating igniter fuel can be hydrocarbon gas such as methane, propane, butane etc., and oxidant can be oxygen containing for air, oxygen-enriched air, richness
Admixture of gas or pure oxygen, the ignition installation further include flammable burner nozzle end 35, the burner nozzle end that this is flammable
Itself is flammable and can further include thermite, it is therefore an objective to promote coal seam to light a fire by burning or exothermic heat of reaction.Knowing should
Igniting is mainly realized in patent by lower carbon number hydrocarbons oxy combustion, although wherein promoting lower carbon number hydrocarbons to burn using thermite,
Fuel and the heat supply of Underground Coal Gasification Process ignition phase are not well solved.
For the prior art, the present invention further improve Underground Coal Gasification Process ignition phase and its applied in
Ignition installation, especially improve ignition installation fuel and ignition phase heat supply, so as to be better achieved
Subterranean coal igniting.
Summary of the invention
For the prior art, the present invention provides a kind of ignition installations for Underground Coal Gasification Process, additionally provide
Application of this ignition installation in Underground Coal Gasification Process ignition phase.
The present invention provides a kind of ignition installations for Underground Coal Gasification Process, wherein the ignition installation includes that
This conveying device being linked in sequence disconnects device, igniter fuse and one or more fuel packets, and plurality of fuel packet is each other
Series connection, and wherein:
The conveying device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse is extended through one or more fuel packets and for being drawn since equipment end with delayed mode
Fire one or more fuel packets；
The disconnection device disconnects after starting ignition fuse, thus withdraws the ignition installation portion including conveying device
Part is to as little as home；With
Comprising thermite and for lighting subterranean coal after being ignited in the fuel packet, the thermite is aluminium powder and energy
The granular mixture of enough metal oxides that thermit reaction occurs therewith, the metal oxide are selected from di-iron trioxide, four
Fe 3 O, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chrome green and manganese dioxide, preferably three oxygen
Change two iron and ferroso-ferric oxide, wherein the mixing ratio of aluminium powder and the metal oxide is the 0.5- of thermit reaction stoichiometric ratio
It 2.0, is preferably 0.7-1.5 and more preferably 0.8-1.2 times, and wherein the dosage of the thermite is enough to provide 20 seconds to 10 points
Clock, preferably 30 seconds to the 7 minutes durations of ignition.
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 lighting a fire using ignition installation of the invention, and starts gasification after lighting a fire successfully, wherein when
When conveying device is coiled tubing or conjugation tube, inside coiled tubing or conjugation tube and coiled tubing or conjugation tube with inject into well
Annular space between bushing pipe is used as the oxidant channel of ignition phase, and when conveying device is integrated signal cable, is helped with pipeline
Positive circle, which seals fuel packet and injects into well to use after annular space between bushing pipe, injects into well bushing pipe as fuel packet push gas passage
And the oxidant channel of ignition phase.
According to the present invention, ignition installation combined application conveying device disconnects device, igniter fuse and one or more
A fuel packet, wherein conveying device accurately can convey and position fuel packet, and igniter fuse is with delayed mode from equipment end
Start to ignite one or more fuel packets (i.e. since the fuel packet closest to the equipment end or from igniter fuse distance
Farthest fuel packet starts), it disconnects device and is disconnected after starting ignition fuse, it is possible thereby to withdraw including conveying device
Ignition installation component to as little as home for subsequent applications, and the fuel packet can be provided after specifically designing it is enough
Initial heat heats subterranean coal to its ignition point, thus lights subterranean coal.
According to the present invention, in the coal underground gasification method, break down in ignition phase as stifled in output well occurs
Plug and/or oxygen leakage and in the case where unignited coal seam, or in gasification occur coal seam interrupt cannot continue gasification
In the case of, it can use ignition installation of the invention and lighted a fire again, including regnition and repeatedly igniting, until point again
Coal-fired layer, to ensure that the final implementation of Underground Coal Gasification Process.
Therefore, using ignition installation of the invention can safely and efficiently realize subterranean coal igniting with start and/or after
Continuous Underground Coal Gasification Process 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 is the ignition installation according to one embodiment of this invention in the schematic diagram for injecting into well bushing pipe inner part,
It is middle as conveying device and to utilize coiled tubing or conjugation tube inside and coiled tubing or engagement using coiled tubing or conjugation tube
Manage and inject into well oxidant channel of the annular space between bushing pipe as ignition phase；
It is complete when including injection well and above ground portion that Fig. 2 gives ignition installation embodiment of the present invention shown in Fig. 1
Schematic diagram；
Fig. 3 is ignition installation according to another embodiment of the present invention in the schematic diagram for injecting into well bushing pipe inner part,
It is middle using integrated signal cable as conveying device, and sealed and fuel packet and injected into well between bushing pipe using pipeline righting circle
Thus annular space uses and injects into well the oxidant channel that bushing pipe pushes gas passage and ignition phase as fuel packet, wherein making
With 3 fuel packets, plug is equipped at 3 fuel packet both ends and is all cased with pipeline righting circle on two plugs；
It is complete when including injection well and above ground portion that Fig. 4 gives ignition installation embodiment of the present invention shown in Fig. 3
Schematic diagram.
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, coal seam；2, boot band (undergauge clip is as igniting positioning baffle)；3, inject into well bushing pipe；4, plug is (preceding
End plug is for blocking with tail end plug for balancing)；5, fuel packet (3 fuel packets are one another in series)；6, igniter fuse (igniting
Fuse extends through 3 fuel packets)；7, device is disconnected；8, distributed temperature, pressure and sonic sensor (are fixed on injection well
It is also fixed on coiled tubing outer wall outside internal lining pipe and using when coiled tubing)；9, check-valves (ball+spring type)；10, external
Grapple connector；11, oxidant channel；12, coiled tubing/conjugation tube；13, gasification zone direction；14, casing is injected；15, well
Mouth coolant/air inlet；16, the spare coolant inlet of well head；17, well head controls equipment；18, coiled tubing reel
(connection instrument and data transmission link in central axis)；19, rotary joint；20, ground oxidizer source pipeline；21, integrated signal
Cable；22, cable connector；23, pipeline righting circle；24, cable service vehicle.
Specific embodiment
The present invention provides a kind of ignition installations for Underground Coal Gasification Process, additionally provide this ignition installation and exist
Application in Underground Coal Gasification Process ignition phase.
Specifically, the present invention provides a kind of ignition installations for Underground Coal Gasification Process, wherein the igniting is set
Standby includes the conveying device being linked in sequence each other, disconnection device, igniter fuse and one or more fuel packets, plurality of combustion
Material packet is one another in series, and wherein:
The conveying device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse is extended through one or more fuel packets and for being drawn since equipment end with delayed mode
Fire one or more fuel packets；
The disconnection device disconnects after starting ignition fuse, thus withdraws the ignition installation portion including conveying device
Part is to as little as home；With
Comprising thermite and for lighting subterranean coal after being ignited in the fuel packet, the thermite is aluminium powder and energy
The granular mixture of enough metal oxides that thermit reaction occurs therewith, the metal oxide are selected from di-iron trioxide, four
Fe 3 O, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chrome green and manganese dioxide, preferably three oxygen
Change two iron and ferroso-ferric oxide, wherein the mixing ratio of aluminium powder and the metal oxide is the 0.5- of thermit reaction stoichiometric ratio
It 2.0, is preferably 0.7-1.5 and more preferably 0.8-1.2 times, and wherein the dosage of the thermite is enough to provide 20 seconds to 10 points
Clock, preferably 30 seconds to the 7 minutes durations of ignition.
According to the present invention, in the ignition installation, the conveying device can be coiled tubing or conjugation tube or integrated
Signal cable, the conveying device accurately can convey and position fuel packet.
According to the present invention, in the ignition installation, when using coiled tubing or conjugation tube as conveying device, continuously
Oil pipe or conjugation tube inside and coiled tubing or conjugation tube and the annular space injected into well between bushing pipe can be employed as ignition phase
Oxidant channel.
According to the present invention, in the ignition installation, when using coiled tubing as conveying device, continuous oil can be passed through
Pipe injects high concentration oxygen agent such as pure oxygen to subterranean coal, this is because coiled tubing is height air-tightness component, it can be to avoid
Safety problem that may be present when using high concentration oxygen agent such as pure oxygen.
As known in the art, coiled tubing is generally wound on coiled tubing reel, is passed through under job state
Coiled tubing reel winding realizes the release of coiled tubing and withdraws that the selection of coiled tubing and its reel is it is ensured that coiled tubing
Wellhole development length inside depth where coal seam can be arrived at and coal seam.
It, can also be using conjugation tube as conveying device, for not using height in the ignition installation according to the present invention
The case where concentration oxidizer such as air gasification, be very economical scheme using common conjugation tube, and shortcoming is on insertion ground
Lower coal seam and time-consuming more and labor intensity is larger during withdrawing.
According to the present invention, in the ignition installation, coiled tubing and conjugation tube as conveying device can pass through conjunction
Suitable connection type is connected with other components, such as the two can effectively be connected by external grapples connector and other components
Connect, the external grapples connector may be implemented non-solder connection and provide airtight sealing, it is possible thereby to easily replacement and
The other components for repairing ignition installation, in addition, conjugation tube can also be connected by hickey with other components.
It is described when using coiled tubing or conjugation tube as conveying device in the ignition installation according to the present invention
One or more check-valves can also be connected between coiled tubing or conjugation tube and disconnection device, are mainly used for preventing reverse gas
Stream enters the coiled tubing or conjugation tube, so that ignition installation associated components keep cleaning and remove or withdraw in ground well head
Safeguard protection is provided when equipment, the check-valves can be applicable any kind of check-valves known to those skilled in the art,
It such as can be spring stop valve or ball+spring type etc..
According to the present invention, in the ignition installation, when using integrated signal cable as conveying device, generally require
Sealed using pipeline righting circle and fuel packet and inject into well the annular space between bushing pipe, it is possible thereby to use inject into well bushing pipe as
Fuel packet pushes the oxidant channel of gas passage and ignition phase, and during conveying fuel packet, it can be according to cable
Level of tightness determines whether fuel packet reaches predetermined ignition position, and can reduce after arrival fuel packet push gas flow with
Avoid cable excessively tight while keeping the positioning of fuel packet, wherein integrated signal cable can be by cable connector and disconnected
Opening apparatus is connected and cable length is likely to become limiting factor.
According to the present invention, in the ignition installation, the disconnection device is a kind of from breaking mechanism, can use pressure letter
Number or electric signal starting, for being disconnected after starting ignition fuse, it is possible thereby to which the igniting withdrawn including conveying device is set
For component to as little as home for subsequent applications, to reduce setting in Underground Coal Gasification Process to a certain extent
Standby loss.
According to the present invention, in the ignition installation, the igniter fuse extends through one or more fuel packets, that is, passes through
Whole fuel packets used in break-through excessively, it can use pressure signal or electric signal starting, and for delayed mode from setting
Standby end starts one or more fuel packets that ignite, wherein can be before fuel is coated with and ignites with delayed mode pilot fuel packet
Using disconnection device the ignition installation component including conveying device is disconnected and withdrawn to as little as home.
As used herein, it refers to opening from the fuel packet closest to the equipment end " since equipment end "
Begin, that is to say, that since with igniter fuse apart from farthest fuel packet.Specifically, when ignite multiple fuel packets when, igniting is drawn
The fuel packet (i.e. with igniter fuse apart from farthest fuel packet) of believer in a certain religion closest to the equipment end start to ignite and then according to
Secondary each fuel packet that ignites backward.
According to the present invention, in the ignition installation, the igniter fuse and disconnection device can use pressure signal
Or electric signal starting, and Selection utilization which kind of signal enabling be typically based on used in conveying device determine, determine that principle is
Simplify process operation and control as far as possible.
Specifically, when using coiled tubing or conjugation tube as conveying device, the igniter fuse and disconnection device are logical
Often each independently using pressure signal start, when use integrated signal cable as conveying device, the igniter fuse with
It disconnects device usually to start using electric signal each independently, when starting using pressure signal, starting disconnects the pressure of device
Usual outline is higher than the pressure of starting ignition fuse to ensure that the two sequentially activates, such as the gas for being 45barg for operating pressure
The pressure-activated igniter fuse of 47.5barg and the pressure-activated disconnection device of 50barg can be used in change process, and electric when utilizing
When signal enabling, igniter fuse and disconnection device pass through independent electric signal respectively and sequentially activate.
According to the present invention, in the ignition installation, subterranean coal is lighted using the fuel packet specifically designed, wherein having
The fuel that body devises the fuel packet itself and its inside is included.
According to the present invention, in the ignition installation, the fuel packet can be single fuel packet or be one another in series more
A fuel packet, comprising thermite and for lighting subterranean coal, the shape one of the fuel packet after being ignited in the fuel packet
As to be matched with bushing pipe is injected into well, for example, the shape of the fuel packet can for cylindrical shape, the outer diameter of the cylinder will be with note
Enter the matching of well liner bore, to guarantee that the fuel packet can move freely in injecting into well bushing pipe, to be transported to
Predetermined ignition position.
According to the present invention, in the ignition installation, the shell of the fuel packet is usually high pressure water proof type shell, preferably
For with proper strength and can be by thermit reaction molten metal shell, more preferably (aluminium fusing point is about 680 to aluminum shell
DEG C), so as to keep fuel packet inject into well conveyed in bushing pipe when structural integrity, and can fuel be coated with ignite after
It is completely burned off；In addition, optionally further including for example complete brill of weak spot of some random distributions on the shell of the fuel packet
Logical drilling, to be conducive to discharge issuable gas in thermit reaction；Further, described after ignition location positioning
Fuel packet itself can also play the role of block igniting forward position channel, with force to a certain extent the oxidant stream of injection into
Enter coal seam for lighting a fire.
According to the present invention, in the ignition installation, in one or more fuel packets front end optionally since equipment end
The identical plug for balance, the plug are equipped with equipped with the plug for blocking igniting forward position channel and in multiple fuel packet tail ends
The material of son is generally carbon steel or fusing point is higher than the metal of aluminium.
Specifically, in ignition installation of the invention, since closest to the equipment end, optionally in one or more
Fuel packet front end (i.e. with igniter fuse apart from farthest fuel packet end) is equipped with the plug for blocking igniting forward position channel, institute
The material for stating closure plug is generally carbon steel or fusing point is higher than the metal of aluminium, it is possible thereby to block more long than fuel packet itself
Igniting forward position channel to force the oxidant stream more injected to enter coal seam for lighting a fire, and works as and uses multiple fuel Bao Shitong
It also often is equipped with the identical plug for balance multiple fuel packet tail ends (i.e. with igniter fuse apart from nearest fuel packet end),
Thus multiple fuel packets is made preferably to keep balance during traveling.
In addition, as already mentioned, when using integrated signal cable as conveying device, needing to help using pipeline
Positive circle seals fuel packet and injects into well the annular space between bushing pipe, can be cased with pipe on one or more fuel incrustations at this time
Road righting circle, and/or in closure plug and multiple fuel packets existing balance with being cased with pipeline righting circle on plug,
Thus it seals and fuel packet and injects into well the annular space between bushing pipe, make to inject into well lining pipe logical for use as fuel packet push gas
The oxidant channel in road and ignition phase, wherein the pipeline righting circle generally has low-friction coefficient, material can be rubber
Glue, preferably high density polyethylene (HDPE).
As be known in the art, the thermite is the mixture of aluminium powder and some metal oxides, when being ignited
The latter two generation thermit reactions oxidize metal the metal in object and are reduced, and the thermit reaction is acutely carried out and released a large amount of
Heat, temperature is up to 2000-3000 DEG C, such as the reaction heat of aluminium and di-iron trioxide is that 945.4cal/g and temperature can be of about 2500
DEG C, but described thermite itself is again highly stable, safely can handle and use.
And thus therefore, the thermit reaction of thermite is that the safe and effective method of enough heats is generated in limited bulk,
It can trigger some reactions for needing high temperature high fever.The present invention is based on the characteristics of thermite and devises the fuel packet.
According to the present invention, in the ignition installation, comprising thermite and for being lighted after being ignited in the fuel packet
Subterranean coal, the thermite are the granular mixture of aluminium powder with the metal oxide that thermit reaction can occur therewith, institute
Ferriferous oxide such as di-iron trioxide and ferroso-ferric oxide, nickel oxide such as nickel sesquioxide and oxygen can be selected from by stating metal oxide
Change nickel and copper oxide, vanadic anhydride, chrome green and manganese dioxide, preferably di-iron trioxide and ferroso-ferric oxide,
Wherein the mixing ratio of aluminium powder and the metal oxide is determined generally according to the stoichiometric ratio of thermit reaction, is specifically as follows
It the 0.5-2.0 of thermit reaction stoichiometric ratio, is preferably 0.7-1.5 and more preferably 0.8-1.2 times, and the wherein thermite
Dosage can suitably be selected based on the required duration of ignition, should preferably be enough to provide 20 seconds to 10 minutes, preferably 30 seconds to 7
The duration of ignition of minute.
It, can also be comprising diluent to reduce its burning in the fuel packet in the ignition installation according to the present invention
Speed and the corresponding extension duration of ignition, the diluent typically granular solids fuel are preferably selected from solid hydrocarbons and charcoal
Powder, the dosage of the diluent generally also can be selected suitably, can generally be no more than diluent and aluminothermy agent composition
40wt%, preferably more than 30wt%, more preferably no more than 25wt%.
According to the present invention, in the ignition installation, thermite and optional diluent in the fuel packet are
Particulate matter, their grain graininess can be selected suitably, but generally tend to mention using the lesser content of grain graininess
High fuel packet heating efficiency, for example, the grain graininess of the thermite and the diluent can be each independently 200nm-
5.0mm, preferably 300nm-4.0mm, more preferably 500nm-2.5mm.
According to the present invention, in the ignition installation, after fuel coating is ignited, aluminothermy occurs for thermite therein
Reaction, it is understood that there may be diluent fuel then burn, the heats generated during these be enough to burn fuel incrustation and
Injecting into well bushing pipe, the Free water at evaporation ignition location in coal seam and promote coal seam temperature to ignition point at ignition location,
It is final to realize coal seam igniting.
Therefore, it is proposed, according to the invention, in the ignition installation, the mixing of adjusting aluminium powder and metal oxide can be passed through
Than, change the selection of diluent and dosage and change the grain graininess of thermite and/or diluent etc. and be designed, thus
Thermal discharge and the duration of ignition etc. for changing fuel packet, to optimize the ignition process of underground coal gasification(UCG).
For example, thermite can be formed with stoichiometric ratio (i.e. molar ratio is 2:1) by aluminium powder and di-iron trioxide, then
(the about 15wt% that powdered carbon dosage is total mixture) is mixed with powdered carbon, it is about 1mm that control, which is formed by the grain graininess of mixture,
Then the mixture is used in fuel packet of the invention.
It is measured according to experiment, the burn time duration after this mixture (6.35 pounds) ignition reaction is about 30 seconds, and common property is raw about
The heat of 11.4MJ, and this sufficiently achieves following effect: melt the aluminum shell of fuel packet；Heat simultaneously evaporated fuel packet and injection
Water in well internal lining pipe annular space in 2 feet of distances；Melt 3 feet long of aluminum internal lining pipe；Heat 237Nm3The nitrogen of/h is extremely
650℃；650 DEG C of ignition point are reached with heating coal seam.
In this way, then can provide combustion in 5 minutes after successively igniting in the fuel packet that 10 this specifications are applied in combination and one by one
The heat for burning duration and about 114MJ, to be enough to light subterranean coal.This shows that fuel packet of the invention can be used well
In in Underground Coal Gasification Process midpoint fire coal layer.
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 lighting a fire using ignition installation of the invention, and starts gasification after lighting a fire successfully, wherein when
When conveying device is coiled tubing or conjugation tube, inside coiled tubing or conjugation tube and coiled tubing or conjugation tube with inject into well
Annular space between bushing pipe is used as the oxidant channel of ignition phase, and when conveying device is integrated signal cable, is helped with pipeline
Positive circle, which seals fuel packet and injects into well to use after annular space between bushing pipe, injects into well bushing pipe as fuel packet push gas passage
And the oxidant channel of ignition phase.
According to the present invention, in the coal underground gasification method, in injection well vertical section jacket exterior, injection well liner
Outside pipe, temperature, pressure and sound wave biography are respectively fixed on output well well head, output well internal lining pipe outside and coiled tubing outer wall
Sensor, for obtaining temperature, pressure and the acoustic signals of subterranean coal and feeding 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 for monitors ignition position, burning zone position, subterranean coal Expenditure Levels, injection well, output well and
The temperature and pressure of gasification zone and well system integrity etc., to control Underground Coal Gasification Process and temperature sensor is attached
Add or alternatively use bimetallic sheath K-type dual probe thermocouple.
Specifically, it is proposed, according to the invention, the function of each temperature, pressure and sonic sensor is described as follows:
Be fixed on temperature outside injection well vertical section jacket exterior, output well well head and output well internal lining pipe, pressure and
Sonic sensor mainly as safety system data source, temperature is excessively high, hypertonia is (such as when the position temperature
Degree and/or pressure reach critical value or be more than design safety value when) when can automatic cut-off system operation and control system can be based on
The acoustic signals of these sensors cope with relevant issues at any time to ensure that well system is complete；
It is fixed on and injects into well temperature, pressure and sonic sensor outside bushing pipe generally through the instrument port near well head
Gasification zone is extended to, and measurement feedback to control system and is stored into database, wherein temperature and pressure senses
Device is mainly used for monitoring temperature and pressure, the temperature of ignition location and the pressure of gasification zone in subterranean coal in subterranean coal,
Wherein sonic sensor is mainly used to confirm ignition location, generally, when gasification zone temperature > 600 DEG C, for example, 600-1200
DEG C when, it is believed that gasified along bushing pipe direction coal seam is injected into well, and the temperature be higher than 1,200 DEG C when then mainly send out
Soft coal burning, in addition, when being all consumed along the subterranean coal for injecting into well bushing pipe, it also can automatic cut-off system operation；
When using coiled tubing as conveying device, temperature, pressure and the sound wave being fixed on coiled tubing outer wall are passed
Sensor can extend to the oxidant nozzle that may be used from the central axis of coiled tubing reel, these sensors and wireless
Transmission device connection, to control system and is stored into database for measurement feedback.
It may be implemented based on the temperature, pressure and sound wave signal acquiring system designed as described above to packet according to the present invention
Include the good control of the entire Underground Coal Gasification Process including ignition phase.
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 mobile for fluid flowing and equipment in lower gasification；Secondly, injecting into well between bushing pipe and coal bed drilling
Annular space also can be used as flow channel after with inert gas purge, for example, after lighting a fire successfully, if coal seam it is very dry and/
Or when the gasification more gasifying agents of needs, the channel can be passed through and inject additional gasifying agent；Again, in order to monitor subterranean coal
Consumption position and related process parameters, stationary distribution formula temperature, pressure and sound wave can be passed on injecting into well bushing pipe outer wall
Sensor, to provide corresponding temperature, pressure and sound wave profile distribution curve.
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；
The internal diameter for injecting into well bushing pipe generally matches with fuel packet outer diameter；Inject into well bushing pipe inner wall and coiled tubing or conjugation tube it
Between annular space can be used as flow channel, be used for example as the oxidant channel of ignition phase；It is usually extended to bushing pipe is injected into well
The bottom of subterranean coal is nearby and above dirt band layer that may be present, and generally, injecting into well bushing pipe will be as closely as possible
The bottom in lower coal seam, but the coal seam that cannot jump out enters underlying stratum, when there are dirt band layer, to be located above dirt band layer, at this time
Preferably there is about 1 meter of thick continuous coal seam between the internal lining pipe and dirt band layer, no coal seam thickness is preferably less than 15 centimetres, more
Preferably smaller 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, to keep the intensity of entire pipeline section.
According to the present invention, wherein igniting positioning baffle is usually arranged in bushing pipe aperture section injecting into well, guaranteeing to light a fire
Under conditions of there are aperture internal lining pipe in positioning baffle two sides, preferably igniting positioning baffle is located at away from injecting into well bushing pipe end 1-
It at 2 complete pipeline sections, is finally positioned with auxiliary fuel packet, wherein the igniting positioning baffle can be welding baffle or undergauge card
Hoop, for presetting igniting position and in the process of running auxiliary fuel packet finally positions, and fuel packet blocks after positioning
Thus the igniting positioning baffle blocks igniting forward position channel and forces the oxidant stream of injection by injecting into well opening on bushing pipe
Hole enters coal seam for lighting a fire.
In addition, as previously mentioned, ignition installation of the invention is since the equipment end optionally at one or more
A fuel packet front end is equipped with the plug for blocking igniting forward position channel, when using igniting positioning baffle, closure plug
Thus son blocks igniting forward position channel and the oxidant stream of injection is forced to pass through injection well liner just for blocking igniting positioning baffle
Aperture on pipe enters coal seam for lighting a fire.
In addition, the Underground Coal Gasification Process with the prior art is similar, drilling well punching is generally included when preparing completion system
It washes and drains and be air-dried, wherein drilling well flushing and draining include removing drilling cuttings and drilling fluid etc. and with pump free in well
Water is drained, and is air-dried including being injected air by injection well and being carried secretly or purge out from the emptying of output well the residual water in well
Come, and is gradually forced into target operating pressure later and injects air always before lighting a fire to keep the circulation of well system and do
It is dry.
According to the present invention, in the coal underground gasification method, it is gentle further to carry out lighting a fire as follows
Change:
Under conditions of injecting air holding well system circulation and drying, start conveying device for one or more fuel packets
It is transported at igniting positioning baffle and positions, fuel packet is used air as when conveying device is integrated signal cable and pushes gas
Body；
Low discharge air is being injected (such as≤300Nm by oxidant channel3The air of/h) under conditions of, starting ignition is drawn
Believe one or more fuel packets that ignite since equipment end with delayed mode, then starting disconnects device to withdraw including conveying
Ignition installation component including device is to as little as home, and the home is far from least 10 meters of ignition location, preferably
At least 20 meters；With
The temperature of monitors ignition position and output well well head gradually increases air stream after injecting into well bushing pipe and starting melting
Amount (such as progressively increases to≤1,000Nm3/ h) stablize until product gas forms, air mass flow is gradually increased again later until output
Well wellhead temperature meets the requirements (such as reaching 120-150 DEG C of predetermined value), in the item that output well plugging and/or oxygen leakage do not occur
Under part, start to inject oxidant and gasifying agent gasifies, wherein if fiber-optic signal feedback display ignition location temperature exceeds
Measurement range and fiber lengths shortening, then can determine that injecting into well bushing pipe starts to melt.
In the above method of the invention, for output well outlet temperature, it is generally basede on oxidant i.e. air flow control
Its heating rate is no more than 20 DEG C/h, preferably more than 15 DEG C/h and stablizes it at 120-150 DEG C, so control output
Well outlet temperature be can be entrained to by product air-flow in order to ensure the volatile matter of coal and the pyrolysis product of coal ground without
Output well is blocked after condensation, while will not destroy well system integrity, stops to light a fire if output well plugging occurs, and can be with base
Oxygen content monitoring oxygen leakage in product gas, when oxygen content can then determine that oxygen, which occurs, to be let out in explosion limit in product gas
Leakage, should also stop to light a fire at this time.
According to the present invention, in the coal underground gasification method, when the high purity oxygen for being greater than 35vol% using oxygen concentration
Agent need to inject coolant when being gasified simultaneously, wherein the annular space injected into well between bushing pipe and coal bed drilling can also be utilized
Gasifying agent is injected, the annular space generally requires before ignition uses inert gas purge.
According to the present invention, in the coal underground gasification method, in the unignited coal seam of ignition phase or gasification
Coal seam generally requires lighted a fire again (including regnition and repeatedly igniting) in the case where interrupting, general using continuous at this time
It is in place that oil pipe reloads and convey fuel packet as conveying device, and dense as oxidant channel injection oxygen using coiled tubing
Degree is the oxidant of 35-50vol% to rekindle coal seam, is here due to its operating flexibility and more main using coiled tubing
If since its height air-tightness can guarantee that the oxidant will not be leaked.
According to the present invention, in the coal underground gasification method, if ignition phase occur output well plugging and/or
Oxygen leakage then stops to light a fire, and usually to determine whether coal seam lights at this time, to be lighted a fire again if unignited.Specifically
Ground is leaked in case of oxygen, and coal seam will not generally light completely at this time, it usually needs be lighted a fire again；In case of output
Well plugging, such as since coal tar condensation leads to output well plugging, then tamper dredging output well is generally first cleared up, then again
Whether confirmation coal seam lights, and only needs to increase oxidizer flow rate if ignited and continues to light a fire, will be again if unignited
Secondary igniting.For being lighted a fire again in ignition phase, wherein use oxygen concentration for the oxidant of 35-50vol% mainly be
Ensure quickly to burn up and remaining after previous igniting injects into well bushing pipe to light new coal seam.
According to the present invention, in the coal underground gasification method, interrupted if coal seam occurs in gasification, such as
Encounter thicker non-coal seam such as dirt band, tomography or fold etc., gasification caused to stop, generally to redefine coal seam position into
Row is lighted a fire again, wherein using oxygen concentration for the oxidant of 35-50vol% primarily to ensuring quickly light new coal
Layer.
The embodiment that it will be convenient to further describe the present invention with respect to the accompanying drawings.
An embodiment of ignition installation of the invention is given in Fig. 1-2, wherein utilizing coiled tubing or conjugation tube
As conveying device.As shown in Figs. 1-2, wherein coiled tubing or conjugation tube 12 pass through external grapples connector 10 and check-valves 9
It is connected, and is further connected to igniter fuse 6 and fuel packet 5 through disconnecting device 7.Distributed temperature, pressure and sonic sensor 8
It is separately fixed at and injects into well outside bushing pipe and on coiled tubing outer wall.It include thermite and diluent in fuel packet 5, igniting is drawn
Letter 6 extends through fuel packet (3 fuel packets are shown in Fig. 1), and the fuel to be ignited first with delayed mode with its lie farthest away
Packet and each fuel packet that then successively ignites backward.Fuel coating discharges heat after igniting, and (is at this time continuous by oxidant channel 11
Oil pipe or conjugation tube 10 and inject into well the annular space between bushing pipe) injection low discharge air, described in the low discharge air carries
Heat is by injecting into well the coal seam 1 and transfer heat to coal seam 1 that the aperture on bushing pipe 3 enters in peripheral circular region.?
Fuel packet front end is equipped with plug 4, for blocking (the contracting of boot band 2 for being located at and injecting into well in bushing pipe 3 after the positioning of fuel packet
Diameter clip is used as igniting positioning baffle simultaneously), so as to force the low discharge air of injection by injecting into well on bushing pipe
Aperture enters coal seam for lighting a fire.
Another embodiment of ignition installation of the invention is given in Fig. 3-4, wherein making using integrated signal cable
For conveying device.As shown in Figure 3-4, wherein integrated signal cable 21 in its end is connected to disconnection device through cable connector 22
7 and igniter fuse 6, wherein disconnecting device 7 and the equal electricity consumption signal enabling of igniter fuse 6.The setting and function of fuel packet 5 in Fig. 3
It is identical with Fig. 1, electric signal control is transmitted simply by integrated signal cable 21 and starting disconnects device 7 and igniter fuse 6.Separately
Outside, integrated signal cable 21 must be injected fuel packet push air by oxidant channel 11 and be made a reservation for convey fuel packet 5 and reach
Ignition location.Closure plug 4 is equipped in fuel packet front end and is equipped with balance plug 4 in fuel packet tail end, and at two
Pipeline righting circle 23 is cased on plug, thus with inject into well bushing pipe inner wall be in close contact realize airtight sealing, with maximum
Change the motive force of fuel packet push air stream.
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 (24)
1. a kind of ignition installation for Underground Coal Gasification Process, wherein the ignition installation includes being linked in sequence each other
Conveying device, disconnection device, igniter fuse and one or more fuel packets, plurality of fuel packet are one another in series, and wherein:
The conveying device is coiled tubing, conjugation tube or integrated signal cable；
The igniter fuse extends through one or more fuel packets and for igniting one since equipment end with delayed mode
A or multiple fuel packets；
The disconnection device disconnects after starting ignition fuse, thus withdraws ignition installation component including conveying device extremely
As little as home；With
Comprising thermite and for lighting subterranean coal after being ignited in the fuel packet, the thermite is aluminium powder and can be with
Generation thermit reaction metal oxide granular mixture, the metal oxide be selected from di-iron trioxide, four oxidation
Three-iron, copper oxide, nickel sesquioxide, nickel oxide, vanadic anhydride, chrome green and manganese dioxide, wherein aluminium powder with it is described
The mixing ratio of metal oxide is 0.5-2.0 times of thermit reaction stoichiometric ratio, and wherein the dosage of the thermite is enough
20 seconds to the 10 minutes durations of ignition were provided.
2. ignition installation described in claim 1, wherein the metal oxide in the fuel packet is selected from di-iron trioxide
And ferroso-ferric oxide, wherein the mixing ratio of aluminium powder and the metal oxide is 0.7-1.5 times of thermit reaction stoichiometric ratio,
Wherein the dosage of the thermite is enough to provide 30 seconds to the 7 minutes durations of ignition.
3. ignition installation described in claim 1 is used wherein being equipped with since equipment end in one or more fuel packets front end
The identical plug for balance, the material of the plug are equipped in the plug for blocking igniting forward position channel and in multiple fuel packet tail ends
Material is the metal that carbon steel or fusing point are higher than aluminium.
4. ignition installation as claimed in claim 2 is used wherein being equipped with since equipment end in one or more fuel packets front end
The identical plug for balance, the material of the plug are equipped in the plug for blocking igniting forward position channel and in multiple fuel packet tail ends
Material is the metal that carbon steel or fusing point are higher than aluminium.
5. the described in any item ignition installations of claim 1-4, wherein the shell of the fuel packet be with proper strength and
Can be by thermit reaction molten metal shell, optional not boring completely including some random distributions on the shell of the fuel packet
Logical drilling is to be conducive to discharge issuable gas in thermit reaction.
6. ignition installation described in claim 5, wherein the fuel incrustation is aluminum shell.
7. the described in any item ignition installations of claim 1-4, wherein also comprising being selected from solid hydrocarbons and powdered carbon in the fuel packet
Particulate diluent, the dosage of the diluent is no more than the 40wt% of diluent and aluminothermy agent composition, and wherein described in
The grain graininess of thermite and the diluent is each independently 200nm-5.0mm.
8. ignition installation as claimed in claim 7, wherein the dosage of the diluent is no more than diluent and aluminothermy agent composition
30wt%, and wherein the grain graininess of the thermite and the diluent is each independently 300nm-4.0mm.
9. ignition installation according to any one of claims 8, wherein the dosage of the diluent is no more than diluent and aluminothermy agent composition
25wt%, and wherein the grain graininess of the thermite and the diluent is each independently 500nm-2.5mm.
10. the described in any item ignition installations of claim 1-4, wherein the conveying device is coiled tubing or conjugation tube,
Described in coiled tubing or conjugation tube effectively connect by external grapples connector with other components, the external grapples connector
It realizes non-solder connection and airtight sealing is provided.
11. ignition installation described in any one of claim 10, wherein the igniter fuse and disconnection device are opened each with pressure signal
It is dynamic, and one or more check-valves are also connected between the coiled tubing or conjugation tube and disconnection device, it is inverse for preventing
Enter the coiled tubing or conjugation tube to air-flow.
12. ignition installation described in claim 3 or 4, wherein the conveying device is integrated signal cable, the integrated signal
Cable is connected by cable connector with device is disconnected, and be cased on one or more fuel incrustations pipeline righting circle with/
Or the plug for blocking forward position channel of lighting a fire and if there is balance with being cased with pipeline righting circle on plug.
13. ignition installation described in claim 12, wherein the igniter fuse and disconnection device start each with electric signal,
The material of the pipeline righting circle is rubber.
14. ignition installation described in claim 13, wherein the material of the pipeline righting circle is high density polyethylene (HDPE).
15. a kind of coal underground gasification method, wherein the completion system for underground coal gasification(UCG) is equipped in subterranean coal,
The middle ignition installation using any one of claim 1-14 is lighted a fire, and starts gasification after lighting a fire successfully, wherein when defeated
When to send device be coiled tubing or conjugation tube, inside coiled tubing or conjugation tube and coiled tubing or conjugation tube and injection well liner
Annular space between pipe is used as the oxidant channel of ignition phase, and when conveying device is integrated signal cable, with pipeline righting
Circle sealing fuel packet and injecting into well use after annular space between bushing pipe inject into well bushing pipe as fuel packet push gas passage and
The oxidant channel of ignition phase.
16. method of claim 15, wherein in injection well vertical section jacket exterior, injecting into well outside bushing pipe, output
It is respectively fixed with temperature, pressure and sonic sensor outside well well head, output well internal lining pipe and on coiled tubing outer wall, for obtaining
It takes temperature, pressure and the acoustic signals of subterranean coal and feeds back to the control system near well head.
17. method described in claim 16, wherein the temperature, pressure and sonic sensor are based on fiber optical time domain reflection
The distributed induction optical fiber of measuring technique, the optical fiber near well head or the central axis of coiled tubing reel by extending always
Bimetallic sheath K-type dual probe thermocouple is additionally or alternatively used to target measurement point and temperature sensor.
18. the described in any item methods of claim 15-17, extend near the bottom of subterranean coal wherein injecting into well bushing pipe
Above dirt band layer that may be present, injects into well bushing pipe and output well internal lining pipe crosses in end, and in section injection well that crosses
Internal lining pipe and the equal aperture of output well internal lining pipe.
19. method of claim 18, wherein the aperture segment length injected into well on bushing pipe and output well internal lining pipe
1-3 complete pipeline sections, open pore size 5-35mm are each independently, the aperture is staggeredly intervally arranged, and the aperture gross area is
The 5-35% of aperture section tube wall area, and wherein setting igniting positioning baffle is being injected into well in bushing pipe aperture section with auxiliary fuel
The final positioning of packet.
20. method described in claim 19, wherein the aperture segment length injected into well on bushing pipe and output well internal lining pipe
2 complete pipeline sections, open pore size 10-25mm are each independently, the aperture is staggeredly intervally arranged, and the aperture gross area is to open
The 10-30% of hole section tube wall area, and wherein setting igniting positioning baffle is being injected into well in bushing pipe aperture section with auxiliary fuel
The final positioning of packet.
21. method described in claim 19 or 20, wherein being lighted a fire and being gasified as follows:
Under conditions of injecting air holding well system circulation and drying, starting conveying device conveys one or more fuel packets
It is positioned at igniting positioning baffle, fuel packet is used air as when conveying device is integrated signal cable and pushes gas；
Starting ignition fuse is opened with delayed mode from equipment end under conditions of injecting low discharge air by oxidant channel
Begin one or more fuel packets that ignite, and then starting disconnects device to withdraw the ignition installation component including conveying device extremely
As little as home；
The temperature of monitors ignition position and output well well head, to gradually increase air mass flow straight after injecting into well bushing pipe and starting melting
It forms and stablizes to product gas, gradually increase air mass flow again later until output well wellhead temperature meets the requirements, do not producing
Under conditions of well plugging and/or oxygen leak out, starts to inject oxidant and gasifying agent gasifies.
22. method described in claim 21, wherein when the high purity oxygen agent using oxygen concentration greater than 35vol% gasifies
When need to inject coolant simultaneously, it is described wherein also inject gasifying agent using the annular space that injects into well between bushing pipe and coal bed drilling
Annular space uses inert gas purge before ignition, and is wherein lighted a fire again in the case where coal seam is interrupted.
23. method described in claim 22, wherein the heating rate based on air flow control output well wellhead temperature does not surpass
It crosses 20 DEG C/h and stablizes output well outlet temperature at 120-150 DEG C to avoid output well plugging, and based in product gas
Oxygen content monitoring oxygen leakage, stop to light a fire if output well plugging and/or oxygen occurs and leaks, wherein the feelings in unignited coal seam
It is lighted a fire again under condition.
24. method described in claim 22 or 23, wherein when being lighted a fire again, using coiled tubing as conveying device
It reloads and conveys that fuel packet is in place, and using coiled tubing as oxidant channel injection oxygen concentration be 35-50vol%'s
Oxidant is to rekindle coal seam, and wherein when output well plugging occurs, it is also necessary to first dredge output well and then carry out again
Secondary igniting.
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| AU2016420954B2 (en) * | 2016-08-24 | 2022-06-02 | Zhongwei (Shanghai) Energy Technology Co. Ltd | Ignition device for underground coal gasification process, and applications thereof |
| CN109611046B (en) * | 2018-03-12 | 2021-04-06 | 东营市科创石油装备有限公司 | Petroleum pipe tool repairing device |
| CN109237513B (en) * | 2018-08-29 | 2024-01-26 | 西安石油大学 | Multistage solid fuel igniter for deep well |
| CN109025950B (en) * | 2018-09-18 | 2024-01-26 | 中为(上海)能源技术有限公司 | Fiber laser ignition system for underground coal gasification process and operation method thereof |
| CN110242238A (en) * | 2019-07-24 | 2019-09-17 | 屈波 | Liner set composite for pipeline |
| CN111425179A (en) * | 2020-03-20 | 2020-07-17 | 北京国利衡清洁能源科技(集团)有限公司 | Novel ignition device and conveying system |
| CN112796726B (en) * | 2021-02-03 | 2022-03-25 | 西南石油大学 | Underground blasting device and method for reservoir fracture expansion of coal-bed gas well |
| CN114413279B (en) * | 2022-01-29 | 2023-02-17 | 山东科技大学 | Ignition roadway ignition method for high-energy rapid ignition of underground coal gasification furnace |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539011A (en) * | 2009-04-30 | 2009-09-23 | 辽河石油勘探局 | Fire flood eclectic ignition method |
| CN203285413U (en) * | 2013-03-12 | 2013-11-13 | 中国石油天然气股份有限公司 | Rolling type electric ignition and monitoring system for combustion of oil in situ |
| CN103573237A (en) * | 2013-11-01 | 2014-02-12 | 邓晓亮 | Telescopic gas injection and ignition device for underground gasification mining |
| CN204283390U (en) * | 2014-08-29 | 2015-04-22 | 中国石油天然气股份有限公司 | The portable high-temperature electric igniting process tubular column of a kind of fireflood |
| CN205243496U (en) * | 2015-10-29 | 2016-05-18 | 新奥气化采煤有限公司 | Manage ignition in succession and have this gasifier of managing ignition in succession |
| CN206053929U (en) * | 2016-08-24 | 2017-03-29 | 中为(上海)能源技术有限公司 | For the ignition installation of Underground Coal Gasification Process |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130312950A1 (en) * | 2011-02-18 | 2013-11-28 | Linc Energy Ltd. | Igniting an underground coal seam in an underground coal gasification process, ucg |
-
2016
- 2016-08-24 CN CN201610716989.5A patent/CN106121619B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101539011A (en) * | 2009-04-30 | 2009-09-23 | 辽河石油勘探局 | Fire flood eclectic ignition method |
| CN203285413U (en) * | 2013-03-12 | 2013-11-13 | 中国石油天然气股份有限公司 | Rolling type electric ignition and monitoring system for combustion of oil in situ |
| CN103573237A (en) * | 2013-11-01 | 2014-02-12 | 邓晓亮 | Telescopic gas injection and ignition device for underground gasification mining |
| CN204283390U (en) * | 2014-08-29 | 2015-04-22 | 中国石油天然气股份有限公司 | The portable high-temperature electric igniting process tubular column of a kind of fireflood |
| CN205243496U (en) * | 2015-10-29 | 2016-05-18 | 新奥气化采煤有限公司 | Manage ignition in succession and have this gasifier of managing ignition in succession |
| CN206053929U (en) * | 2016-08-24 | 2017-03-29 | 中为(上海)能源技术有限公司 | For the ignition installation of Underground Coal Gasification Process |
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