CN206053927U - For the oxidant injection device of Underground Coal Gasification Process - Google Patents
For the oxidant injection device of Underground Coal Gasification Process Download PDFInfo
- Publication number
- CN206053927U CN206053927U CN201620929481.9U CN201620929481U CN206053927U CN 206053927 U CN206053927 U CN 206053927U CN 201620929481 U CN201620929481 U CN 201620929481U CN 206053927 U CN206053927 U CN 206053927U
- Authority
- CN
- China
- Prior art keywords
- oxidant
- nozzle
- coiled tubing
- injection device
- hole
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
This utility model provides a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant injection device includes oxidant channel, the oxidant channel includes each other the swivel joint of air-tightness connection in order, coiled tubing, mechanical shearing device and oxidant nozzle, wherein described mechanical shearing device is used to cut off oxidant nozzle when necessary to recall coiled tubing, wherein described swivel joint makes ground oxidizer source connect with the central shaft air-tightness of coiled tubing reel, even if thus continuing to inject oxidant during coiled tubing movement oxidant nozzle is wound by coiled tubing reel.
Description
Technical field
This utility model provides a kind of oxidant injection device for Underground Coal Gasification Process.Especially, this reality
With new there is provided a kind of equipment that high concentration oxygen agent can be continuously injected in Underground Coal Gasification Process, this is additionally provided
Kind of application of the oxidant injection device in Underground Coal Gasification Process, be particularly used in Underground Coal Gasification Process igniting and
Course of normal operation.
Background technology
Underground coal gasification(UCG) (UCG or ISC) process is in the presence of an oxidizer will by the burning and gasification of subterranean coal
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 various applications, including
Fuel production, chemicals production and generating etc..In view of the increasingly stricter environmental requirement of mining industry in view of related 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 is carried 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 generally to be provided with subterranean coal.The completion system
System is generally included for injecting the various reagents such as injection well of oxidant, gasifying agent and coolant etc., for removing product gas
Set is equipped with typically each in withdrawal well and the various service wells for helping out, wherein injection well, withdrawal well and service well
Pipe and/or internal lining pipe and communicate with each other on demand, wherein the service well generally includes ignition well, freezing well, barrier wells and anti-
Guide-well etc., wherein injection well are usually horizontal orientation well, and withdrawal 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 sleeve pipe
And/or injection well and the 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, wherein：Burning
Area typically starts to extend from oxidant and gasifying agent decanting point, and in combustion zone, coal occurs combustion in the presence of oxidant and gasifying agent
Burn and gasify；Gasification zone is located at combustion zone downstream or is centered around around combustion zone with radial, and in gasification zone, coal is mainly by gas
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 preferable 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, the product gas for being generated generally comprise 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 surrounding formations penetrate into the water in coal seam) of the oxidant (such as air, oxygen-enriched air or pure oxygen), water that use,
The quality of coal and the technological parameter (temperature and pressure etc.) for being adopted.
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 it is too high as higher than 35vol% when if must simultaneously using coolant avoid combustion
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
It is necessarily favourable that high concentration oxygen agent such as pure oxygen carries out Underground Coal Gasification Process.
In addition, in Underground Coal Gasification Process, oxidant generally can't be continuously injected into completely.Especially, when in coal
When needing to change in charcoal underground gasification process oxidant injection phase, to generally stop oxidant injection.For example, for rollback method
Underground Coal Gasification Process, wherein generally wanting regular rollback oxidant injection phase, such as continuous gasification wants rollback to aoxidize after 30 days
50 meters of agent injection phase, and to generally stop oxidant injection in back off procedure.In this case, underground coal gasification(UCG)
Journey is real " continuous " as a whole, and this " discontinuous " necessarily causes product gas quality to occur to fluctuate, when fluctuate compared with
Problem will be brought for the subsequent applications of product gas when big.Therefore, if can be really continuous in Underground Coal Gasification Process
Injection oxidant is necessarily favourable.
WO2014/043747A1 discloses a kind of apparatus and method for implementing 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 jointer of gun body tail end, the engagement
Have on device for leading to the hole of thermocouple；It is connected at least one intersegmental pipe 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 oxygen-enriched underground gasification is refer in the patent, wherein actually note
Enter what air was operated.
WO2014/186823A1 discloses a kind of for supplying oxidant and water to coal seam in Underground Coal Gasification Process
Apparatus and method, wherein the equipment includes oxidant channel and bobbin seal, the oxidant channel includes at least one well
Bottom perforate and at least one uphole end perforate, the downhole end perforate is for the injection oxidation of underground gasification area
Agent, for fluidly connecting with coiled tubing, described sleeve pipe is sealed for sealing oxidant channel and well for the uphole end perforate
Circular passage between hole sleeve, has one or more for injecting the logical of water to underground gasification area in described sleeve pipe sealing
Road.Although oxidant can be substantially pure oxygen in the patent, controlled rollback decanting point concept is wherein used, this correspondence
Be the Underground Coal Gasification Process being spaced apart by some retraction phases in prior art.
In a word, in the prior art, the Underground Coal Gasification Process still has much room for improvement in some respects, specifically includes：
How the burning and gasification in coal seam are better controled over to provide high quality of products gas；How oxidant injection is not being interrupted
In the case of realize transfer or the rollback of oxidant injection device；How under shaft bottom hot environment oxidant injection device is avoided
Damage and inject into well the melting of bushing pipe；And how preferably to carry out underground monitoring to control Underground Coal Gasification Process.
Therefore, Underground Coal Gasification Process of the prior art remains a need for further improving, it is especially desirable to realize oxidant
Be continuously injected into and high concentration oxygen agent such as pure oxygen safe handling.
Utility model content
For prior art, this utility model provides a kind of oxidant injection for Underground Coal Gasification Process and sets
It is standby.Especially, this utility model can be continuously injected into high concentration oxygen agent in Underground Coal Gasification Process there is provided a kind of
Equipment, additionally provides application of this oxidant injection device in Underground Coal Gasification Process, is particularly used in coal underground
The igniting of gasification and course of normal operation.
This utility model provides a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant note
Entering equipment includes oxidant channel, and the oxidant channel includes each other the swivel joint of air-tightness connection, continuous oil in order
Pipe, mechanical shearing device and oxidant nozzle, wherein the mechanical shearing device be used to cutting off oxidant nozzle when necessary with
Coiled tubing is recalled, and wherein described swivel joint connects ground oxidizer source and the central shaft air-tightness of coiled tubing reel
It is logical, even if thus continuing to injection oxidation during coiled tubing movement oxidant nozzle is wound by coiled tubing reel
Agent.
This utility model additionally provides a kind of coal underground gasification method, wherein being provided with subterranean coal for coal ground
The completion system of lower gasification, wherein being continuously injected into subterranean coal using oxidant injection device Jing injection wells of the present utility model
High concentration oxygen agent, wherein the high concentration oxygen agent is comprising at least 80vol% oxygen, preferably at least 90vol% oxygen is oxygen-enriched
Air or pure oxygen, wherein also utilize by the oxidant injection device coiled tubing and inject into well the annular space shape between bushing pipe
Into accessory channel simultaneously inject coolant, the coolant is water, water vapour or carbon dioxide, and now the coolant is used simultaneously
Make the gasifying agent of coal gasification course.
According to this utility model, the oxidant injection device is combined with the individual features and function of each part, especially
Swivel joint and coiled tubing are applied in combination so that not only can be continuously injected into incessantly in Underground Coal Gasification Process
Oxidant, realizes the Underground Coal Gasification Process of real continuous operation, and can use high concentration oxygen agent with security and stability
Such as pure oxygen, it is hereby achieved that high-quality and stay-in-grade product gas, are that prior art brings progress.
According to this utility model, when Underground Coal Gasification Process is carried out using rollback method, due to make use of this practicality new
The oxidant injection device of type, it is no longer necessary in the loaded down with trivial details dismounting behaviour for interrupting mobile oxidant nozzle in the case that oxidant injects
Make, comparatively operate more flexible, such that it is able to significantly shorten prior art rollback method back-off period and/or
Rollback distance, it might even be possible to realize the Underground Coal Gasification Process of the substantially continuous movement in gasification position in subterranean coal.
Therefore, according to this utility model, it is possible to achieve the rollback method Underground Coal Gasification Process of short cycle small distance rollback,
The back-off period can be significantly foreshortened to two weeks by least 30 days of prior art, or even was foreshortened to several days, more even shortened
To 1 day, and the rollback distance can significantly foreshorten to 10 meters by the 50 of prior art meters, or even foreshorten to 5 meters, more even contract
1 meter is as short as, it is possible thereby to realize the Underground Coal Gasification Process of the substantially continuous movement in gasification position in subterranean coal, this undoubtedly will
The better quality of the product gas produced by making and more stable, is that prior art brings progress.
Description of the drawings
Below with reference to the accompanying drawings further describing this utility model, wherein：
Fig. 1 gives a part for the oxidant injection device of the present utility model injected into well in bushing pipe located underground
Schematic diagram；
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 (the pneumatic protection plug removed on oxidant nozzle)；
Fig. 3 gives the schematic diagram (containing ground and subsurface equipment) of coal underground gasification method of the present utility model.
In the drawings, identical reference refers to same parts.Specifically, the reference implication being related in each accompanying drawing
It is as follows：
1st, inject into well bushing pipe；2nd, boot band；3rd, pneumatic protection plug；4th, oxidant nozzle；5th, distributed temperature, pressure
(it is separately fixed at and injects into well outside bushing pipe and on coiled tubing outer wall) with sonic sensor；6th, mechanical shearing device；7th, only
Return valve；8th, coiled tubing external grapples adapter；9th, accessory channel (by coiled tubing and injects into well the annular space shape between bushing pipe
Into)；10th, oxidant channel；11st, coiled tubing；12nd, gasification zone direction；13rd, igniter；14th, inject casing；15th, well head
Coolant/air inlet；16th, the standby coolant inlet of well head；17th, well head control device；18th, coiled tubing reel (in
Connection instrument and data transmission link in heart axle)；19th, swivel joint；20th, ground oxidizer source pipeline.
Specific embodiment
This utility model provides a kind of oxidant injection device for Underground Coal Gasification Process.Especially, this reality
With new there is provided a kind of equipment that high concentration oxygen agent can be continuously injected in Underground Coal Gasification Process, this is additionally provided
Kind of application of the oxidant injection device in Underground Coal Gasification Process, be particularly used in Underground Coal Gasification Process igniting and
Course of normal operation.
According to this utility model, there is provided a kind of oxidant injection device for Underground Coal Gasification Process, the oxygen
Agent injection device includes oxidant channel, the oxidant channel include each other in order the swivel joint of air-tightness connection,
Coiled tubing, mechanical shearing device and oxidant nozzle, wherein the mechanical shearing device is used to cut off oxidant when necessary
Nozzle is recalling coiled tubing, and wherein described swivel joint makes ground oxidizer source airtight with the central shaft of coiled tubing reel
Property connection, even if thus by coiled tubing reel wind coiled tubing move oxidant nozzle during continue to injection
Oxidant.
According to this utility model, in the oxidant injection device, the swivel joint is suitable for pure oxygen in high pressure ring
The sealing swivel joint in border, is realized between ground oxidizer source and coiled tubing drum center axle using the swivel joint
Air-tightness is connected, such that it is able to continue to during coiled tubing movement oxidant nozzle is wound by coiled tubing reel
Injection oxidant, such as when withdrawing oxidant nozzle using coiled tubing in rollback method Underground Coal Gasification Process, the rotation
Joint still can ensure that being continuously injected into for high concentration oxygen agent such as pure oxygen, it is achieved thereby that Underground Coal Gasification Process is in time
Seriality.
According to this utility model, in the oxidant injection device, the swivel joint can be institute in prior art
Using any suitable sealing swivel joint, such as the swivel joint disclosed in US3884511 and CN104279385B
This utility model is being may be used for after accommodation, these patents are described herein by reference and introduce in full.
According to this utility model, in the oxidant injection device, the coiled tubing is main for oxidant channel
Ingredient, reaches the pre-determined bit in subterranean coal mainly for delivery of oxidant and transfer oxidant nozzle and ignition installation
Put.
According to this utility model, in the oxidant injection device, coiled tubing is using special adapter such as outside
Grapple adapter and other part effectively connections, this adapter connect for non-solder mode and can provide airtight sealing, example
Good sealing is such as provided in the range of operating pressure, therefore, easily can be changed using this external grapples adapter and
Other parts in maintenance oxidant channel.
Coiled tubing be height air-tightness part, it is possible thereby to avoid high concentration oxygen agent such as pure oxygen in use by
In the safety problem that leakage etc. causes.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 shaft is provided with coiled tubing reel, the central shaft and company
Continuous oil pipe body interior connection, above-mentioned swivel joint is exactly that the central shaft of Jing coiled tubing reels makes oxidizer source and coiled tubing
Body interior is connected 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 external diameter of coiled tubing is typically based on precalculated static hydraulic flow and the pressure drop of permission is selected.Continuous oil
The material and wall thickness of pipe be typically based on the property of coolant used, expected Underground Coal Gasification Process cycle of operation, be expected into
Go out number of times and oxidizer flow rate of subterranean coal etc. to be selected, typically can be expired using 316L rustless steels or higher level material
Foot its corrosion-resistant, resistant to corrosion and antioxidation etc. are required.
Temperature, pressure and sonic sensor can be arranged on coiled tubing outer wall, the terminal of these sensors typically sets
Put in the central shaft of coiled tubing reel, thus the test point of these sensors can extend always and be distributed with coiled tubing
To subterranean coal, and radio transmitting device is generally equipped with inside coiled tubing reel, pass measured signal back control
System.The central shaft of coiled tubing reel typically also will specially design and manufacture and thoroughly clean to meet high concentration oxygen agent such as
The requirement of pure oxygen environment.
According to this utility model, in the oxidant injection device, the mechanical shearing device is one kind from breaking mechanism,
For cutting off oxidant nozzle when necessary to recall coiled tubing, such as in oxidant nozzle as failure is as deformed or distorting
Etc. be stuck in inject into well in bushing pipe or be stuck due to injecting into well bushing pipe melting cannot move when, then optionally may be used
To continue operation in maintenance and/or after changing oxidant nozzle.
Due to combining mechanical shearing device, it can be ensured that most of part of oxidant injection device is when necessary such as oxygen
Agent nozzle can be withdrawn ground with on-call maintenance and/or replacing, so as to reduce coal to a certain extent after breaking down
Equipment loss in charcoal underground gasification process.
According to this utility model, in the oxidant injection device, in the oxidant channel in the coiled tubing and
Can also be connected with one or more check-valves between mechanical shearing device, plurality of check-valves be mainly used in it is standby, it is described
Check-valves are mainly used in preventing inverted draft from entering coiled tubing, so that associated components keep cleaning simultaneously in oxidant injection device
On ground, well head removes or provides when withdrawing equipment safeguard protection, and the check-valves can be known to those skilled in the art being suitable for
In any kind of check-valves of high concentration oxygen agent such as pure oxygen environment, for example, can be spring stop valve or ball+spring type etc..
According to this utility model, in the oxidant injection device, oxidant channel end be oxidant nozzle, oxygen
Thus agent is distributed and enters subterranean coal.Therefore, oxidant nozzle is the crucial portion of oxidant injection device of the present utility model
Position in part, generally also failure, it is necessary to carefully design and use there is.
According to this utility model, the oxidant nozzle must adapted to be high temperature, high pressure and swiftly flowing height
The hot environment of concentration oxidizer such as pure oxygen environment and subterranean coal thereabout；The material of the oxidant nozzle is necessary
It is appropriate to select, for example can be selected from pyrite, inconel and Monel etc.；The outside of the oxidant nozzle
Shape must be smoothly transitioned from as far as possible, i.e. its any external dimensions change is all the progressive formation of gradually transition, so as to
Smoothly move injecting into well in bushing pipe, and the oxidant nozzle there will be enough wall thickness, to provide contact area and strong
Radiating is met while spending and is cooled down and required, and resist be likely to occur any and flashed back, thereby guarantee that the complete of oxidant nozzle
Property and reliability.
According to this utility model, the inner passage of the oxidant nozzle will be adapted to the such as pure oxygen flowing of high concentration oxygen agent,
The inner passage must be clean, it is impossible to have microgranule or hydrocarbon pollution, and the interior channel surface is typically passed through
Meet the special processing of pure oxygen job requirements；In addition, the external diameter of the oxidant nozzle be also designed to it is adjustable, thus
Annular space between bushing pipe and oxidant nozzle can be injected into well controlling coolant by adjusting oxidant nozzle od and adjusting
Flow velocity, and then accelerate or slow down and take away heat from oxidant nozzle.
According to this utility model, the oxidant nozzle can be the nozzle head with one or more holes, wherein carrying
The hole size of the single-hole nozzle head in one hole is typically based on the maximum jet velocity of outlet and determines, and maximizes jet velocity and be conducive to
Carry more coolants in oxidant stream secretly and be directly entered gasification zone, and multiple holes of the jet rose head with multiple holes can be with
By center and peripheral distribution, the wherein each hole in periphery can be parallel with centre bore so that the oxidant for spraying is in the way of narrow focusing
Be injected into gasification zone, or each hole in periphery can according to it is angled with centre bore as 5-35 ° of angle, preferred 8-20 ° it is angular outer
Diverging so that the oxidant of ejection enters gasification zone with bigger coverage rate；In addition, the oxidant nozzle can be with nozzle head
Plus the special for example miniature venturi lines of miniature water conservancy diversion lines for designing near end, nozzle head end 2- can be close to specifically
Miniature venturi lines is provided with 20mm, preferred 3-15mm, for guiding coolant the hole on the nozzle head to be reached to implement
Cooling protection.
According to this utility model, the oxidant nozzle can also carry pneumatic protection plug, and the pneumatic protection plug is general
For circle, oxidant nozzle tip is placed on, for oxidant nozzle is protected under non-job state, is starting to inject oxidant
When can by hyperbaric oxygen agent stream blow off without hinder oxidant injection.
According to this utility model, in the Underground Coal Gasification Process using rollback method, the oxidant nozzle can lead to
Cross coiled tubing reel winding coiled tubing and distance is determined regular rollback in bushing pipe is injected into well, such that it is able to by injection well
Underground coal deposits around internal lining pipe is all consumed paragraph by paragraph, only leaves coal ash.
This utility model additionally provides a kind of coal underground gasification method, wherein being provided with subterranean coal for coal ground
The completion system of lower gasification, wherein being continuously injected into subterranean coal using oxidant injection device Jing injection wells of the present utility model
High concentration oxygen agent, wherein the high concentration oxygen agent is comprising at least 80vol% oxygen, preferably at least 90vol% oxygen is oxygen-enriched
Air or pure oxygen, wherein also utilize by the oxidant injection device coiled tubing and inject into well the annular space shape between bushing pipe
Into accessory channel simultaneously inject coolant, the coolant is water, water vapour or carbon dioxide, and now the coolant is used simultaneously
Make the gasifying agent of coal gasification course.
Therefore, when underground coal gasification(UCG) is carried out using oxidant injection device of the present utility model, coiled tubing with note
The annular space entered between well internal lining pipe can serve as accessory channel, and in addition to coolant, the accessory channel can be also used for when needed
Reagent needed for other is injected to subterranean coal, wherein reagent needed for other can include such as gasifying agent and igniting oxidant etc..
According to this utility model, in the coal underground gasification method, subterranean coal is injected by the accessory channel
Coolant mainly have following functions：Heat around oxidant nozzle can be removed by heat exchange effect and avoid oxidant nozzle
Temperature is too high；When carrying out withdrawing oxidant nozzle using coiled tubing in Underground Coal Gasification Process using rollback method, can be with
By the injection flow for reducing coolant, for example, reduce coolant flow 10-80%, accelerate to inject into well in front of oxidant nozzle
The burn rate of liner portion；With when using water or water vapour or carbon dioxide as coolant, they can be used as coal simultaneously
The gasifying agent of charcoal underground gasification process.
For example, when using water as coolant, it will be converted into water near oxidant nozzle and in the gasification zone of downstream
Steam, now can be by controlling water vapour ratio come control process temperature so that the solid (carbon) of hydrocarbon-containiproducts, liquid
(volatile matters 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 this utility model, in the coal underground gasification method, use comprising at least 80vol% oxygen, preferably extremely
Used as oxidant, it is higher that this high concentration oxygen agent can provide quality such as calorific value to the oxygen-enriched air or pure oxygen of few 90vol% oxygen
Product gas, but condition be must and meanwhile use coolant, the coolant can be water, water vapour or carbon dioxide, preferably
For water or carbon dioxide, these coolants can the gasifying agent as coal gasification course simultaneously, thus optimize whole coal underground
Gasification.
According to this utility model, in the coal underground gasification method, pure oxygen is preferably used as oxidant and use
Water or carbon dioxide are preferably injected with certain mol ratio with pure oxygen as coolant, the now coolant, specifically, as
The water or carbon dioxide of coolant injection can be 0.5-6.0 with the mol ratio of the pure oxygen as oxidant injection, preferably
1.0-5.0, and more preferably 1.5-4.0.
According to this utility model, in the coal underground gasification method, in injection well vertical section jacket exterior, injection well
Temperature, pressure and sonic sensor can be respectively fixed with outside internal lining pipe, on coiled tubing outer wall and oxidant nozzle, used
In obtaining the temperature of subterranean coal, pressure and acoustic signals and feed back to the control system near well head.
According to this utility model, the temperature, pressure and sonic sensor can be to be measured based on fiber optical time domain reflection
The distributed sensing optical fiber of technology (Optical Time-Domain Reflectometry---OTDR), the optical fiber can be with
Target measurement point is extended to by near well head or the central shaft of coiled tubing reel, it is bent to obtain corresponding temperature
Line, pressure curve and sound wave curve are used to monitor oxidant injection phase, burning zone position, subterranean coal Expenditure Levels, gasification
The temperature and pressure and well system integrity in area etc., so as to control Underground Coal Gasification Process, and temperature sensor can be with
For bimetallic sheath K-type dual probe thermocouple, for example, bimetallic sheath K can be additionally or alternatively used at oxidant nozzle
Type dual probe thermocouple, to obtain the temperature and be based on the temperature control coolant flow.
Specifically, according to this utility model, the function of each temperature, pressure and sonic sensor is described as follows：
Temperature, pressure and the sonic sensor of injection well vertical section jacket exterior are fixed on mainly as safety system
Data Source, temperature is too high, hypertonia (is such as set when the position temperature and/or pressure reach marginal value or exceedes
During meter safety value) when, can automatic cut-off system operation；
It is fixed on and injects into well temperature outside bushing pipe, pressure and sonic sensor and be mainly used in monitoring gas in subterranean coal
Change the temperature and pressure in area, the instrument port near the general Jing ground well head of these sensors extends to gasification zone, and will
Measurement feedback is to control system and is stored into data base, usually, 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 the temperature then mainly occurred coal when being higher than 1,200 DEG C
Burning, in addition when being all consumed along the subterranean coal for injecting into well bushing pipe, also can automatic cut-off system operation；
Being fixed on temperature on coiled tubing outer wall, pressure and sonic sensor can be from the central shaft of coiled tubing reel
Extend to oxidant nozzle, these sensors are connected with radio transmission apparatus, by measurement feedback to control system simultaneously
Data base is stored into, wherein, temperature and pressure sensor is mainly used in the Temperature Distribution on monitoring coiled tubing, oxidant nozzle
The pressure of gasification zone in the temperature and subterranean coal at place, and sonic sensor be mainly used to confirm oxidant nozzle position, control
It is complete to guarantee well system that system processed can tackle relevant issues at any time based on acoustic signals；With
Bimetallic sheath K-type dual probe thermocouple can also be additionally or alternatively fixed on oxidant nozzle, to obtain
The temperature simultaneously injects flow based on the temperature control coolant.
According to this utility model, based on the temperature of design as described above, pressure and sound wave signal acquiring system, it is possible to achieve
Good control to whole Underground Coal Gasification Process.
According to this utility model, for the completion system being located in the ground in coal seam, well system (includes injection well and product
Go out well) internal lining pipe can be linked together using any suitable connected mode commonly used in the art, can for example adopt
The connected modes such as welding, screw thread, clip groove, flange, cutting ferrule or card pressure, the principle for being followed are to ensure that final completion system
Can be best.
According to this utility model, for the completion system, it is critically important ingredient to inject into well bushing pipe, it
Function it is intact be important guarantee that whole Underground Coal Gasification Process is smoothed out.
Specifically, inject into well the function major embodiment of bushing pipe in the following areas：First, it is coal ground to inject into well bushing pipe
The important channel of the flowing of lower gasification process medium fluid and equipment such as oxidant nozzle movement；Secondly, bushing pipe and coal seam are injected into well
Annular space between drilling also can be used as flow channel after with inert gas purge, for example, if coal seam is dried and/or gasifies very much
When process needs more gasifying agents, additional gasifying agent can be injected by the passage；Again, in order to monitor the consumption of subterranean coal
Position and related process parameters, can on bushing pipe outer wall is injected into well stationary distribution formula temperature, pressure and sonic sensor, with
Corresponding temperature, pressure and sound wave profile distribution curve are provided.
According to this utility model, the material for injecting into well bushing pipe typically can be selected according to subsurface formations lithostatic pressure and hydrostatic pressing
Select；The internal diameter for injecting into well bushing pipe is typically matched with the maximum outside diameter of oxidant nozzle, when oxidant nozzle od scalable
When, coolant flow speed can be controlled by regulation annular space therebetween, such that it is able to accelerating or slow down from oxidant nozzle
And its surrounding takes away heat；Injecting into well the annular space between bushing pipe inwall and coiled tubing, to be generally basede on coolant maximum stream flow true
It is fixed, to meet coolant flow requirement；Usually extend to the bottom of subterranean coal nearby and may deposit with bushing pipe is injected into well
Dirt band layer above, usually, injecting into well bushing pipe will be as close possible to the bottom in underground coal seam, but coal seam of can not jumping out is entered
Enter underlying stratum, when there is dirt band layer, will be located above dirt band layer, now preferably having between the internal lining pipe and dirt band layer
About 1 meter of thick continuous coal seam, is preferably less than 15 centimetres without coal seam thickness, more preferably less than 10 centimetres.
According to this utility model, inject into well bushing pipe and withdrawal well internal lining pipe typically will be crossed each other in end, and
The section that crosses inject into well bushing pipe and withdrawal well internal lining pipe will perforate, be beneficial to produced by product gas by injecting into well bushing pipe
Finally removed into withdrawal well internal lining pipe and by withdrawal well.
In this case, for bushing pipe and withdrawal well internal lining pipe is injected into well, perforate segment length can be each only
It is on the spot the complete pipeline sections of 1-3, preferably 2, open pore size is generally 5-35mm, preferred 10-25mm, between the perforate typically interlocks
Every arrangement, and the perforate gross area can be 5-35%, the preferred 10-30% of perforate section tube wall area；In addition, wherein completely managing
Section meter is typically starting perforate apart from least 0.5 meter distant place of box cupling, is beneficial to the intensity for keeping whole pipeline section.
According to this utility model, the coal underground gasification method is preferably carried out using rollback method.In this case, institute
Gasification is stated generally from the beginning of the position of withdrawal well liner tube end is close to, wherein initially by being configured in oxidant nozzle end
Igniter is connected on oxidant nozzle and is transplanted on pre- by the pneumatic means interface (generally with predetermined Pneumatic pressure) in portion
Determine ignition location, afterwards using oxidant stream or pressure activation with starting ignition, wherein the igniter is typically with party in delay
Formula start, with provide time enough rollback oxidant nozzle away from ignition location and reach home, so as to away from
The high-energy discharged during ignition device and high heat, and wherein in ignition phase, also by by coiled tubing and injection well
Accessory channel injection air such as≤300Nm that annular space between internal lining pipe is formed3The low discharge air of/h is used as igniting oxidant,
And after the completion of igniting, then stop injection air and start to inject coolant, while injecting oxidant by oxidant channel.
According to this utility model, when Underground Coal Gasification Process is carried out using rollback method, in igniting coal of successfully start
It is after underground gasification process, general periodically to make oxidant nozzle rollback determine that distance is come by coiled tubing reel winding coiled tubing
Continue the gasification, and the operating flexibility due to this utility model oxidant injection device and oxidant injection are continuous
Property, wherein back-off period and rollback distance significantly can shorten, and it is 1 day that such as back-off period can reach most short, thus may be used
With daily rollback oxidant nozzle 1-10 rice, preferred 1-5 rice and more preferably 1-3 rice changing the gasification position in subterranean coal,
And can continue to inject oxidant such as pure oxygen and coolant in oxidant nozzle back off procedure, so as to realize coal underground
Gasification in time real continuous and substantially continuous in subterranean coal space.
According to this utility model, when Underground Coal Gasification Process is carried out using rollback method, in oxidant nozzle rollback mistake
Cheng Zhong, can based on inject into well the material of bushing pipe, wall thickness and its prediction burning velocity correspondingly reduce coolant flow and/or
Oxidant such as pure oxygen flow is increased, for example, can be reduced coolant flow 10-80% and/or be increased pure oxygen flow 10-20%, with
Accelerate in front of oxidant nozzle, to inject into well the burn rate of liner portion, so as to quickly expose fresh coal seam for gas
Change, this process will be continued for until being consumed along the subterranean coal for injecting into well bushing pipe completely.
Therefore, according to this utility model, for the improvement of whole oxidant injection device is realized to underground coal gasification(UCG)
The effective control of process.
Below with reference to the accompanying drawings further describe embodiment of the present utility model.
Fig. 1 gives the signal of the part positioned at the oxidant injection device of the present utility model injected into well in bushing pipe
Figure.In FIG, oxidant nozzle 4 is connected with mechanical shearing device 6, and the mechanical shearing device ensures that oxidant nozzle is stuck in
Oxidant nozzle can be disconnected equipment remainder is recalled ground when injecting into well in bushing pipe 1；Mechanical shearing device 6 and non-return
Valve 7 is connected, and the check-valves are used to prevent inverted draft from entering coiled tubing, so as to avoid the equipment from being contaminated and in surface well
Mouth is removed or provides safeguard protection when withdrawing equipment；Check-valves 7 are connected with 11 Jing external grapples adapter 8 of coiled tubing；Distribution
Formula temperature, pressure and sonic sensor 5 be separately fixed at inject into well outside bushing pipe and coiled tubing outer wall on, it is whole to provide
The hot active signal of Underground Coal Gasification Process, along gasification zone direction 12 coal consumption situation and oxidant nozzle 4 position
Put；When oxidant injection device enters underground, the pneumatic protection plug 3 installed in 4 front end of oxidant nozzle can prevent pollution
Thing invades oxidant nozzle, and is conducive to the smooth movement of whole oxidant injection device；It is oxidant channel in coiled tubing
10, wherein oxidant stream enters gasification zone to after oxidant nozzle 4；The annular space between bushing pipe and coiled tubing is injected into well it is
Accessory channel 9, wherein can be passed through coolant provides cooling 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 the pneumatic protection plug 3 in wherein Fig. 1 is removed, and pressure activation/pneumatic detached igniter can be passed through
13 are connected on oxidant nozzle.In this embodiment, first with oxidant injection device of the present utility model igniting
Device 13 is transported to predetermined ignition position, and and then is carried out a little by injecting oxidant stress activation and disconnecting igniter 13
Fire.
Fig. 3 gives the schematic diagram (containing ground and subsurface equipment) of coal underground gasification method of the present utility model.Such as Fig. 3
Shown, wherein implementing Underground Coal Gasification Process using the oxidant injection device shown in Fig. 1, wherein 11 Jing of coiled tubing connects
Continuous oil pipe reel 18 discharges, and injects into well bushing pipe 1 by what is injected inside casing 14 in the case where well head control device 17 is controlled, will
The oxidant nozzle being attached thereto is sent to gasification zone；The initiating terminal of coiled tubing 11 is in the central shaft of coiled tubing reel 18
(not shown)；The initiating terminal of the oxidizer source pipeline 20 and coiled tubing 11 on the connection of swivel joint 19 ground, the rotation connect
Head may insure to continue to inject oxidant during coiled tubing reel winding coiled tubing.
This utility model is not limited to embodiments described above, for a person skilled in the art, this practicality
New to have various change and adjustment, without departing from spirit of the present utility model and principle, the change and adjustment are equal
Should be in the range of this utility model.
Claims (9)
1. a kind of oxidant injection device for Underground Coal Gasification Process, the oxidant injection device include that oxidant leads to
Road, the oxidant channel include each other the swivel joint of air-tightness connection, coiled tubing, mechanical shearing device and oxygen in order
Agent nozzle, wherein the mechanical shearing device is used to cut off oxidant nozzle when necessary to recall coiled tubing, and wherein
The swivel joint makes ground oxidizer source connect with the central shaft air-tightness of coiled tubing reel, even if thus by continuous
Continue to inject oxidant during oil pipe reel winding coiled tubing movement oxidant nozzle.
2. oxidant injection device according to claim 1, wherein the oxidant channel also includes being connected to the company
One or more check-valves between continuous oil pipe and mechanical shearing device, for preventing inverted draft from entering coiled tubing.
3. oxidant injection device according to claim 1 and 2, wherein the coiled tubing in the oxidant channel
By external grapples adapter and other part effectively connections, the external grapples adapter is realized non-solder connection and provides gas
Close property sealing.
4. oxidant injection device according to claim 1 and 2, wherein the inner passage of the oxidant nozzle is adapted to height
Concentration oxidizer flows, the external diameter scalable of the oxidant nozzle, and the oxidant nozzle also carries pneumatic protection plug, uses
Blown off in protection oxidant nozzle and when starting and injecting oxidant by hyperbaric oxygen agent stream.
5. oxidant injection device according to claim 3, wherein the inner passage of the oxidant nozzle be adapted to it is highly concentrated
Degree oxidant flow, the external diameter scalable of the oxidant nozzle, and the oxidant nozzle also carry pneumatic protection plug, are used for
Protect oxidant nozzle and blown off by hyperbaric oxygen agent stream when starting and injecting oxidant.
6. oxidant injection device according to claim 4, wherein the oxidant nozzle is with one or more holes
Nozzle head, wherein the hole size of the single-hole nozzle head with a hole is determined based on the maximum jet velocity of outlet, with multiple
Multiple Kong An centers of the jet rose head in hole and each hole of peripheral distribution and periphery it is parallel with centre bore or according to centre bore into
5-35 ° angular outer to dissipate, and the nozzle head is provided with miniature venturi lines being close at the 2-20mm of its end, cold for guiding
But agent reaches hole on the nozzle head to implement cooling protection.
7. oxidant injection device according to claim 6, wherein the jet rose head with multiple holes is multiple
Kong An centers and each hole of peripheral distribution and periphery according to centre bore into 8-20 ° it is angular it is outer dissipate, and the nozzle head is being close to
Miniature venturi lines is provided with the 3-15mm of its end, for guiding coolant to reach the hole on the nozzle head to implement cooling
Protection.
8. oxidant injection device according to claim 5, wherein the oxidant nozzle is with one or more holes
Nozzle head, wherein the hole size of the single-hole nozzle head with a hole is determined based on the maximum jet velocity of outlet, with multiple
Multiple Kong An centers of the jet rose head in hole and each hole of peripheral distribution and periphery it is parallel with centre bore or according to centre bore into
5-35 ° angular outer to dissipate, and the nozzle head is provided with miniature venturi lines being close at the 2-20mm of its end, cold for guiding
But agent reaches hole on the nozzle head to implement cooling protection.
9. oxidant injection device according to claim 8, wherein the jet rose head with multiple holes is multiple
Kong An centers and each hole of peripheral distribution and periphery according to centre bore into 8-20 ° it is angular it is outer dissipate, and the nozzle head is being close to
Miniature venturi lines is provided with the 3-15mm of its end, for guiding coolant to reach the hole on the nozzle head to implement cooling
Protection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620929481.9U CN206053927U (en) | 2016-08-24 | 2016-08-24 | For the oxidant injection device of Underground Coal Gasification Process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620929481.9U CN206053927U (en) | 2016-08-24 | 2016-08-24 | For the oxidant injection device of Underground Coal Gasification Process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206053927U true CN206053927U (en) | 2017-03-29 |
Family
ID=58385140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620929481.9U Withdrawn - After Issue CN206053927U (en) | 2016-08-24 | 2016-08-24 | For the oxidant injection device of Underground Coal Gasification Process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206053927U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121618A (en) * | 2016-08-24 | 2016-11-16 | 中为(上海)能源技术有限公司 | Oxidant injection device and application thereof for Underground Coal Gasification Process |
| CN108518211A (en) * | 2018-03-29 | 2018-09-11 | 中为(上海)能源技术有限公司 | Oxidant mixed injection system and operating method for coal underground gasifying technology |
-
2016
- 2016-08-24 CN CN201620929481.9U patent/CN206053927U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106121618A (en) * | 2016-08-24 | 2016-11-16 | 中为(上海)能源技术有限公司 | Oxidant injection device and application thereof for Underground Coal Gasification Process |
| CN108518211A (en) * | 2018-03-29 | 2018-09-11 | 中为(上海)能源技术有限公司 | Oxidant mixed injection system and operating method for coal underground gasifying technology |
| 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 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106761653B (en) | Nozzle equipment for coal underground gasification process and operation method thereof | |
| CN106121618B (en) | For the oxidant injection device of Underground Coal Gasification Process and its application | |
| RU2706498C1 (en) | Equipment for oxidizer injection during underground gasification of coal and its use | |
| AU2014303165B2 (en) | Gas injection apparatus with controllable gas injection point, gas injection process, and gasification method | |
| CN106121617B (en) | Waste heat for coal underground gasifying technology recycles product well system and operating method | |
| US20130312950A1 (en) | Igniting an underground coal seam in an underground coal gasification process, ucg | |
| CN106150472B (en) | Conjugation tube injected system and operating method for coal underground gasifying technology | |
| CN106121619B (en) | Ignition installation and its application for Underground Coal Gasification Process | |
| AU2016420451B2 (en) | Production well apparatus for underground coal gasification and use thereof | |
| CN108518211B (en) | Oxidant mixed injection system for underground coal gasification process and operation method | |
| CN206053927U (en) | For the oxidant injection device of Underground Coal Gasification Process | |
| CN106089179A (en) | Withdrawal well equipment and application thereof for Underground Coal Gasification Process | |
| WO2014186823A1 (en) | Oxidant and water injection apparatus | |
| CN205990905U (en) | Conjugation tube injected system for coal underground gasifying technology | |
| WO2014043747A1 (en) | Oxygen injection device and method | |
| CN206053929U (en) | For the ignition installation of Underground Coal Gasification Process | |
| WO2018035734A1 (en) | Ignition device for underground coal gasification process, and applications thereof | |
| CN206608160U (en) | Shower nozzle equipment for coal underground gasifying technology | |
| CN208633812U (en) | Oxidant mixed injection system for coal underground gasifying technology | |
| AU2015101610A4 (en) | Controlled burn back method | |
| AU2015101245A4 (en) | Oxygen and water injection process for underground coal gasification | |
| AU2016100004A4 (en) | Oxygen enriched ucg method | |
| AU2015100327A4 (en) | Oxygen injection device and method | |
| WO2014179833A1 (en) | Controlled burn back method | |
| AU2015101707A4 (en) | Oxidant and water injection apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170329 Effective date of abandoning: 20190108 |
|
| AV01 | Patent right actively abandoned |