CN106089179A - Withdrawal well equipment and application thereof for Underground Coal Gasification Process - Google Patents
Withdrawal well equipment and application thereof for Underground Coal Gasification Process Download PDFInfo
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- CN106089179A CN106089179A CN201610712514.9A CN201610712514A CN106089179A CN 106089179 A CN106089179 A CN 106089179A CN 201610712514 A CN201610712514 A CN 201610712514A CN 106089179 A CN106089179 A CN 106089179A
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- pipe
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- coolant
- well
- product gas
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- 238000001816 cooling Methods 0.000 claims abstract description 38
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
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- 238000013461 design Methods 0.000 abstract description 15
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- 241000269793 Cryothenia peninsulae Species 0.000 description 2
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- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
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- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/06—Measuring temperature or pressure
- E21B47/07—Temperature
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics (AREA)
- Pipeline Systems (AREA)
Abstract
The invention provides a kind of withdrawal well equipment for Underground Coal Gasification Process.Especially, the invention provides a kind of withdrawal well equipment that can remove product gas in Underground Coal Gasification Process after cooling down by injecting coolant, additionally provide the application in Underground Coal Gasification Process of the described withdrawal well equipment.The present invention is by being optimized the design of each parts, selection and the application of described withdrawal well equipment and the application of withdrawal well itself, the operation making described withdrawal well equipment is more safely controllable, and its major part parts such as wellhead equipment, product pipe, coolant hose and measuring instrument system etc. can completely or partially reclaim after gasification terminates and reuse.
Description
Technical field
The invention provides a kind of withdrawal well equipment for Underground Coal Gasification Process.Especially, the invention provides
A kind of withdrawal well equipment that can remove product gas in Underground Coal Gasification Process after cooling down by injecting coolant, also provides for
Described withdrawal well equipment application in Underground Coal Gasification Process.
Background technology
Underground coal gasification(UCG) (UCG or ISC) process is in the presence of an oxidizer by burning and the gasification general of subterranean coal
Coal is converted into the process of product gas (also referred to as crude synthesis gas), and described product gas can be subsequently used for multiple application, including
Fuel production, chemicals production and generating etc..The environmental requirement the strictest in view of mining industry and in view of relevant artificial
Cost and capital construction cost, this coal underground gasification technology being applicable to most of coal deposits is undoubtedly the most attractive.
For coal gasification course, the most on the ground or underground is carried out, it is the most all by following series of chemical
Coal is made to convert, wherein H2O and CO2For major gasification 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)
(water gas shift reaction)
(methanation reaction).
In Underground Coal Gasification Process, in subterranean coal, to be generally provided with corresponding completion system.Described completion system
System generally includes the injection well for injecting various reagent such as oxidant, gasifying agent and coolant etc., for removing product gas
Withdrawal well and for the various service wells that help out, is typically each equipped with set in wherein injecting well, withdrawal well and service well
Pipe and/or internal lining pipe and communicating with each other on demand, wherein said service well generally includes ignition well, freezing well, barrier wells and anti-
Guide-wells etc., wherein inject well and 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 the injection well of internal lining pipe and withdrawal well form, also known as underground coal gasification(UCG) unit or well pair.
In Underground Coal Gasification Process, relevant subterranean zone includes combustion zone, gasification zone and pyrolysis zone, wherein: burning
District typically starts to extend from oxidant and gasifying agent decanting point, and in combustion zone, coal fires in the presence of oxidant and gasifying agent
Burn and gasification；Gasification zone is positioned 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 positioned at downstream, gasification zone, 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 the fewest.Along with the gradually propelling of Underground Coal Gasification Process, coal
The burned out area formed in Ceng becomes larger, and finally descends coal deposits to be consumed completely, only leaves coal ash.
In Underground Coal Gasification Process, the 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 particular make-up of described product gas generally depends on multiple factor, including institute
The oxidant (such as air, oxygen-enriched air or pure oxygen) that uses, the existence water of coal seam (coal seam water or the surrounding formations penetrate into) of water,
The quality of coal and the technological parameter (temperature and pressure etc.) used.
In Underground Coal Gasification Process, due to the strongly exothermic property of gasification, the product gas generated is generally of pole
High temperature, the most generally 700-800 DEG C and sometimes even up to 1000 DEG C, and directly tackle the product of this high-temperature product gas
Go out well and must face multiple due to the high temperature height problem that caused of heat, specifically include the cause thermal damage of withdrawal well associated components and wet
Heat erosion damages, and such as definitely high temperature such as 700 DEG C exceedes the yield stress invalid temperature of withdrawal well shell material and causes output
Well damages, and thermal expansion and/or thermal stretching cause sleeve pipe and/or cement layer to damage, and thermal stretching causes product pipe bending in withdrawal well
Deform, and wet corrosion product gas causes the deterioration of withdrawal well integrity and damages, such as granule and high-speed gas erosion, hydrogen embrittlement or hydrogen
Cause cracking, chloride ion spot corrosion, sulfide (H2S) stress corrosion cracking, CO2Corrosion and dissimilar metal couple corrosion etc..
Therefore, for the withdrawal well equipment for Underground Coal Gasification Process, if it is possible to preferably reply high temperature web rot
Erosion property product gas, can prevent and reduce contingent various problem and/or can shut-in well or disused well after reclaim and again
Utilize section components, will be very favorable undoubtedly.
AU2014100615 provides a kind of UCG product air cooling and swashs method and apparatus, wherein arrives withdrawal well at product gas
Reduce the product temperature physically and/or chemically character with the described product gas of change before, wherein main by being positioned at operation gas
The service well of Hua Qu downstream and withdrawal well upstream to product gas logistics inject cold shock fluid, with by product temperature by about 500-
1200 DEG C are reduced to about 200-400 DEG C.Understand and this patent uses service well inject cold shock fluid to cool down product gas, and due to
The individually existence of service well, this design is undoubtedly relatively costly and structure is relative complex.
Therefore, for the Underground Coal Gasification Process of prior art, the withdrawal well equipment applied in it remains a need for improving,
Especially to improve and how tackle the high temperature wet corrosion product gas that gasification produces.
Summary of the invention
For prior art, the invention provides a kind of withdrawal well equipment for Underground Coal Gasification Process.Especially,
The invention provides a kind of output that can remove product gas in Underground Coal Gasification Process after cooling down by injecting coolant
Well equipment, additionally provides the application in Underground Coal Gasification Process of the described withdrawal well equipment.
The invention provides a kind of withdrawal well equipment for Underground Coal Gasification Process, described withdrawal well equipment includes well
Jaws equipment and sleeve pipe and be positioned at the product pipe of sleeve pipe, coolant hose and measuring instrument system, wherein:
Described sleeve pipe is used for reinforcing and isolate withdrawal well wellhole, and it uses box cupling and screw thread are attached and pass through cement layer
It is fixed in withdrawal well wellhole；
The product gas that described product pipe is used for producing gasification is from withdrawal well delivered downhole to ground, and it is provided with out in end
Hole section；
Described coolant hose for being injected into the product gas that withdrawal well down-hole produces with cooling gasification by coolant, and it is at end
Portion connects coolant jet；
Described measuring instrument system downwardly extends from well head and is fixed near product tube end perforate section starting point, wherein wraps
Include temperature, pressure and the sonic sensor being arranged in protection sleeve pipe；With
Described wellhead equipment air-tightness blocks described sleeve pipe and includes the instrument pressed joint end for measuring instrument system
Mouth, the outlet of the product gas outlet for product pipe, the sleeve pipe annular space for sleeve pipe and the coolant entrance for coolant hose；
Being wherein that product gas is quenched district in coolant jet downstream, wherein gasify the product gas and cooled dose of nozzle produced
The coolant contact of ejection and mixing and be cooled, condition is intended heat effect and/or gravitational effect causes expansion and/or
Elongation does not affect the relative position between degree of freedom and each parts of each parts itself.
Present invention also offers a kind of coal underground gasification method, be wherein provided with in subterranean coal for the coal ground therapeutic method to keep the adverse QI flowing downwards
The completion system changed, wherein utilizes the withdrawal well equipment of the present invention, the most cooled dose of pipe to inject coolant to withdrawal well down-hole
Product gas multiparity QC after the product gas produced with cooling gasification and cooling is transported to ground, and described coolant is selected from water, water
Ambient product gas after steam, carbon dioxide, noble gas or liquid and cooling, and the injection flow of coolant be enough to make well
Lower product temperature is reduced to below setting value.
According to the present invention, described withdrawal well equipment is combined with coolant hose so that can in Underground Coal Gasification Process
Immediately to cool down, by injecting coolant to withdrawal well down-hole, the high-temperature product gas that gasification produces, such as cold by suitably controlling
But agent flux, can be cooled to less than about 400 DEG C by product gas by initial temperature about 700-1000 DEG C, thus significantly reduce
The subsequent thermal load of withdrawal well, especially product pipe, the running environment improving withdrawal well and the operation longevity extending withdrawal well
Life, and then improve reliability and the safety of Underground Coal Gasification Process, bring progress for prior art.
Additionally, it is proposed, according to the invention, by the design of each parts, selection and the application of described withdrawal well equipment and output
The application of well itself is optimized so that the operation of described withdrawal well equipment is more safely controllable, and its major part parts are such as
Wellhead equipment, product pipe, coolant hose and measuring instrument system etc. completely or partially can reclaim after gasification terminates
With reuse, thus saved the equipment cost of Underground Coal Gasification Process to a certain extent, brought for prior art
Progressive.
Accompanying drawing explanation
Below with reference to the accompanying drawings the present invention is further described, wherein:
Fig. 1 is the under ground portion profile of a kind of embodiment of the withdrawal well equipment of the present invention, wherein said withdrawal well
For vertical withdrawal well, and wherein product gas quenching district is positioned at bottom withdrawal well；
Fig. 2 is the under ground portion profile of the another embodiment of the withdrawal well equipment of the present invention, wherein said output
Well is horizontal orientation withdrawal well, and wherein product gas quenching district is positioned at withdrawal well anhydrous mud layer free pipe section end, is wherein producing
It is provided with deflector in QC perforate section and carrys out contacting and mixing between enhanced products gas and coolant；With
Fig. 3 is the under ground portion profile of another embodiment of the withdrawal well equipment of the present invention, wherein said output
Well is horizontal orientation withdrawal well, and wherein product gas quenching district is positioned at withdrawal well anhydrous mud layer free pipe section end and by product pipe
Gap between perforate section and withdrawal well internal lining pipe perforate section is formed.
In the drawings, identical reference refers to same parts.Specifically, the reference implication related in each accompanying drawing
As follows:
1, product pipe；2, product pipe perforate section；3, coolant hose；4, check-valves；5, coolant jet；6, coolant；7、
Measuring instrument system；8, withdrawal well sleeve pipe；9, fixing high-temperature water mud layer is used；10, product gas quenching district；11, from gasification zone
Product gas；12, product pipe outlet；13, coolant entrance；14, measuring instrument system port；15, withdrawal well sleeve pipe annular space outlet；
16, well coal bed drilling is injected；17, bushing pipe perforate section is injected into well；18, coal seam；19, deflector (be located in product pipe perforate section,
Direct product gas enters back into product pipe after by product gas quenching district)；20, the free pipe section of anhydrous mud layer；21, output
Well coal bed drilling；22, gap (i.e. clearance-type product gas quenching district) between product pipe perforate section and withdrawal well internal lining pipe perforate section；
23, withdrawal well internal lining pipe perforate section.
Detailed description of the invention
The invention provides a kind of withdrawal well equipment for Underground Coal Gasification Process.Especially, the invention provides
A kind of withdrawal well equipment that can remove product gas in Underground Coal Gasification Process after cooling down by injecting coolant, also provides for
Described withdrawal well equipment application in Underground Coal Gasification Process.
According to the present invention, it is provided that a kind of withdrawal well equipment for Underground Coal Gasification Process, described withdrawal well equipment
Including wellhead equipment and sleeve pipe and be positioned at the product pipe of sleeve pipe, coolant hose and measuring instrument system, wherein:
Described sleeve pipe is used for reinforcing and isolate withdrawal well wellhole, and it uses box cupling and screw thread are attached and pass through cement layer
It is fixed in withdrawal well wellhole；
The product gas that described product pipe is used for producing gasification is from withdrawal well delivered downhole to ground, and it is provided with out in end
Hole section；
Described coolant hose for being injected into the product gas that withdrawal well down-hole produces with cooling gasification by coolant, and it is at end
Portion connects coolant jet；
Described measuring instrument system downwardly extends from well head and is fixed near product tube end perforate section starting point, wherein wraps
Include temperature, pressure and the sonic sensor being arranged in protection sleeve pipe；With
Described wellhead equipment air-tightness blocks described sleeve pipe and includes the instrument pressed joint end for measuring instrument system
Mouth, the outlet of the product gas outlet for product pipe, the sleeve pipe annular space for sleeve pipe and the coolant entrance for coolant hose；
Being wherein that product gas is quenched district in coolant jet downstream, wherein gasify the product gas and cooled dose of nozzle produced
The coolant contact of ejection and mixing and be cooled, condition is intended heat effect and/or gravitational effect causes expansion and/or
Elongation does not affect the relative position between degree of freedom and each parts of each parts itself.
According to the present invention it is also provided a kind of coal underground gasification method, wherein it is provided with for coal in subterranean coal
The completion system of underground gasification, wherein utilizes the withdrawal well equipment of the present invention, the most cooled dose of pipe to inject to withdrawal well down-hole
Coolant is transported to ground with the product gas multiparity QC after cooling down gasify the product gas produced and cooling, and described coolant is selected from
Water, steam, carbon dioxide, noble gas or liquid and cooling after ambient product gas, and coolant injection flow foot
So that down-hole product temperature is reduced to below setting value.
According to the present invention, described withdrawal well equipment can be vertical withdrawal well or horizontal orientation withdrawal well, for both
Withdrawal well type, wherein critical piece is basically identical, and simply some parts may exist some differences in specific design details.
Further, since withdrawal well is to be dealt with to liking the high temperature wet corrosion product that Underground Coal Gasification Process produces
Gas, therefore, whole withdrawal well and each parts thereof are in this high temperature wet corrosion gaseous environment mostly.So, to output
When each parts of well are designed, to consider in addition to the corrosion of high temperature resistant wet-heat resisting when selection, it is also contemplated that heat effect is (as swollen in heat
Swollen and/or thermal stretching etc.) and/or the part dimension change that may cause of gravitational effect (as hung deadweight etc.), the most generally want
Leave expansion clearance and/or elongation clearance etc..
Further, since the present invention has carried out comprehensive optimization to design, selection and the application etc. of withdrawal well equipment components, make
Obtaining most of parts can completely or partially reclaim after gasification terminates and reuse, this is also the output of the present invention
The advantage place of well equipment.
According to the present invention, described sleeve pipe starts to extend to coal seam from well head as the shell of withdrawal well, and its
In contain the product pipe of withdrawal well, coolant hose and measuring instrument system；The box cupling of described sleeve pipe and screw thread and fixing use
Cement layer is intended to be suitable for the hot environment of withdrawal well down-hole, high temperature box cupling to be used and screw thread and high-temperature cement；It addition,
There is annular space between described internal surface of sleeve pipe and each pipe fitting, at ignition phase, this sleeve pipe annular space is generally with noble gas such as nitrogen etc.
Purge and block to prevent downhole fluid such as product gas and/or coolant etc. from entering wherein, and when abnormal running, this sleeve pipe
Annular space then can serve as the pressure release passage of whole well system, now, downhole fluid such as product gas can by this sleeve pipe annular space from
Open, thus discharge and alleviate the pressure of whole well system, to prevent stratum/coal seam from bearing excess pressure.
According to the present invention, the material of described sleeve pipe typically will be based on its inside annular space as misoperation pressure release passage time institute
The high temperature wet corrosion gas of contact selects, and high temperature resistant and moisture-proof corrosive gas, to guarantee that whole well system is in fortune
Integrity in line period, said cycle of operation includes the parking of final gasification, equipment Removal and shut-in well or useless
The well stage；The internal diameter of described sleeve pipe to be typically sufficient to accommodate product pipe, coolant hose and measuring instrument system and leave phase
The clearance answered, to prevent thermal expansion etc. from causing plumbing dimensions to change, such as when product pipe external diameter be 4.5 inches, outside coolant hose
Footpath is 2 inches and time measuring instrument system protection sleeve outer is 0.75 inch, and the internal diameter of sleeve pipe can be 9.625 inches, separately
Outward, optionally, it is also possible to determine whether to use outer ring sleeve pipe according to stratum characteristic such as the stratum property of water-bearing and/or sponginess etc.,
Such as guide thimble, surface pipe and protective casing etc., reinforce and isolation withdrawal well wellhole with further；The wall thickness one of described sleeve pipe
As the requirement of drilling and well completion operation to be met, the most also want to withstand greater than the pressure of lithostatic pressure.
According to the present invention, for vertical withdrawal well, described sleeve pipe generally pushes up to coal seam by cement layer is securing elongated
Near portion, in this case, the most whole withdrawal well length has sleeve pipe and the most whole casing length all to use cement
Layer is fixing, and for horizontal orientation withdrawal well, described sleeve pipe is generally securing elongated to horizontal position in coal seam by cement layer
Put neighbouring or for there being inclination angle coal seam securing elongated near the position parallel with seat earth, the most anhydrous mud layer
Free pipe section, is finally to extend to withdrawal well end without sleeve pipe coal bed drilling section.
According to the present invention, described wellhead equipment is the external interface of withdrawal well, typically through graphite gasket with casing threads even
Connecing, block described sleeve pipe with air-tightness and ensure the air-tightness of withdrawal well, wherein said wellhead equipment includes for measuring instrument
The instrument pressed joint port of system, the product gas outlet for product pipe, the sleeve pipe annular space for sleeve pipe export and for cold
But these parts of the coolant entrance of agent pipe, i.e. withdrawal well are collected at wellhead equipment and are connected with outside by wellhead equipment
Logical.
According to the present invention, described wellhead equipment is usually the High Temperature High Pressure wellhead equipment High Temperature High Pressure work with applicable withdrawal well
Making environment, such as, the design rated pressure lithostatic pressure to be met of described wellhead equipment and operating temperature range are generally
180-350 DEG C, the material solid particle impingement to be tolerated of described wellhead equipment and high temperature wet corrosion gaseous environment, and
Described wellhead equipment after withdrawal well terminates service life (as after shut-in well or disused well) can remove, and one can entered
Step processes to be reused after renovation.
According to the present invention, described measuring instrument system is for monitoring the such as temperature of the coherent signal in withdrawal well, pressure harmony
Ripples etc., simultaneously feed back to Wellhead Control System measured signal and are stored in data base, wherein relevant temperature, pressure
Downhole area is entered back in being generally arranged at protection sleeve pipe with sonic sensor.
In downhole area, described measuring instrument system is typically secured on product pipe, such as, be typically secured to product pipe
Near end perforate section starting point, now substantially it is quenched downstream, district at product gas, the temperature of product gas after measured essentially cooling
Degree, generally this temperature to reach product temperature setting value after cooling, and concrete numerical value is usually 300-350 DEG C.Further, since protect
The use of protecting pipe, described measuring instrument system typically can reclaim and reuse after gasification terminates.
According to the present invention, described temperature, pressure and sonic sensor can be all based on fiber optical time domain reflection measurement technology
The distributed sensing optical fiber of (Optical Time-Domain Reflectometry--OTDR), can obtain corresponding temperature
Curve, pressure curve and sound wave curve, to monitor withdrawal well and to control Underground Coal Gasification Process, described temperature sensor also may be used
With additionally or alternatively for bimetallic sheath K-type dual probe thermocouple.
According to the present invention, in described measuring instrument system, the function of temperature, pressure and sonic sensor is the most as described below:
Temperature Distribution in temperature sensor monitors withdrawal well, wherein: target measurement point i.e. product tube end on product pipe
Temperature (product gas quenching district is downstream into the temperature of product gas after the cooling of product pipe) near perforate section starting point is generally used for
Control coolant flow, to guarantee that this temperature is less than setting value (usually 300-350 DEG C)；Withdrawal well wellhead temperature corresponding product
Product temperature in pipe and in sleeve pipe annular space, this wellhead temperature can also be used for controlling coolant flow, such as can be by increasing
Coolant flow guarantees that this wellhead temperature is less than setting value (usually 180-350 DEG C)；It addition, target is surveyed on described product pipe
Amount point temperature and withdrawal well wellhead temperature are used equally to security system, when measured temperature exceedes their setting value (generally
It is respectively 300-350 DEG C and 180-350 DEG C) time, oxidant can be cut off immediately and inject stopping gasification.
Pressure transducer, for monitoring the pressure distribution in withdrawal well, is simultaneously available for having found that what subsurface pressure caused
The damage of measuring instrument system protection sleeve pipe, further, since well head pressure is consistently lower than down-hole pressure, therefore well head pressure signal
Can be as down-hole product pipe and the instruction of sleeve pipe annular pressure.
Sonic sensor is used for monitoring withdrawal well down-hole situation, such as some emergency case, the most such as sleeve pipe or product
Pipe damages the entrance product pipes such as (cracking or bending etc. occur), solid particle or liquid bolt and causes product blockage etc., in order to sending out
Can tackle in time and process after these situations raw.
Described measuring instrument system measuring instrument to be collected in port and by pressed joint port through described well
Jaws equipment.It addition, the well head measuring instrument equipment as a Wellhead Control System part allows for directly displaying data, so
Even if just can ensure that other system remains able to monitor the inner case of withdrawal well when being in off-line state, and then ensure whole
Withdrawal well can the most controlled operation.
According to the present invention, it is aboveground that described product pipe is connected to product by well mouth hanger.Specifically, described product pipe is certainly
By hanging on the center of well mouth hanger, for by product gas from withdrawal well delivered downhole to ground, for time properly functioning
Product gas is transported to the main circulation passage on ground.
In Underground Coal Gasification Process, even if it is high temperature wet corrosion gas that produced product gas remains on after the cooling period
Body, the present invention uses product pipe as the transfer passage of described product gas, internal surface of sleeve pipe can be avoided to produce with high temperature wet corrosion
Product gas directly contacts, and protects sleeve pipe the most to a certain extent, but this also selection to product pipe itself propose higher wanting
Asking, specifically, the material of product pipe have to tolerate high temperature wet corrosion gaseous environment, and corrosion to be tolerated includes example
Such as high temperature hydrogen burn into stress corrosion cracking (hydrogen embrittlement or hydrogen induced cracking (HIC), sulfide-stress cracking (H2S and COS etc.) and chlorination
Thing stress corrosion cracking (HCl etc.)), sour gas corrosion (CO2、H2S、H2SO4, HCl etc.), dew point corrosion, ammonium chloride and sulfur hydrogen
What change ammonium burn into sulfidation corrosion, graphitic corrosion, dissimilar metal couple corrosion and solid particle and/or high-speed gas caused invades
Lose and wash away；Further, since product pipe free suspension and its inside be in hot environment, design time must also consider heat
The product length of tube change that effect and/or gravitational effect etc. may cause, to ensure the degree of freedom of product pipe and to prevent product pipe
Bending, ensures the relative design relation between product pipe and other parts, coolant jet to be ensured and product pipe simultaneously
The relativeness of perforate section；And owing to having selected the most high level resistance to gentle corrosion resistant material, the product pipe of the present invention
Typically can reclaim and reuse after gasification terminates.
It addition, during the product pipe of the design present invention, it is maximum that the internal diameter of described product pipe is generally basede on product gas
Flow (the product throughput that i.e. maximum oxygen agent is corresponding when injecting flow) and corresponding maximum quenching requirement determine, this product gas
Maximum stream flow is exactly the maximum productivity of relevant Underground Coal Gasification Process；Satisfied support deadweight, underground work require with
And on the premise of maximum design pressure, select minimum product pipe walls thick based on standardized product pipe outside dimension and weight；Really
Determine product gas minimum discharge under load down operational mode (i.e. minimum oxidant injects product throughput corresponding during flow), to protect
Card product air-flow be enough to carry liquid therein and solid impurity secretly and prevents to ground product pipe from blocking, and this product gas is minimum
Flow is exactly the minimum load down production capacity of relevant Underground Coal Gasification Process.
According to the present invention, the end of described product pipe generally uses tube having holes, be beneficial to product gas enter product pipe and with
After be transported to ground, the length of described product tube end perforate section typically can be about the complete pipeline section of 1-4, and open pore size can
Thinking 5-35mm, preferred 10-25mm, described perforate can interlock and be spaced, and the perforate gross area can be perforate section tube wall
The 5-35% of area, preferred 10-30%.
According to the present invention, it is aboveground that described coolant hose is connected to product also by well mouth hanger.Specifically, described cooling
Agent pipe is parallel to product pipe and is freely suspended from the eccentric position of well mouth hanger, for coolant is injected into withdrawal well down-hole with
Cooling gasification produce product gas, and described coolant hose end connect have coolant jet.
According to the present invention, the internal diameter of described coolant hose is generally basede on coolant flow and corresponding structural intergrity requirement
Determining, the material of coolant hose is generally the corrosion resistant material of rustless steel or higher level, and thus, coolant hose is in gasification
Process typically can also reclaim and reuse after terminating.
According to the present invention, in described coolant hose, may be provided with one or more check-valves for preventing inverted draft
Entering coolant hose, plurality of check-valves is mainly used in standby.Described check-valves is generally of a range of unlatching pressure,
Can be used to maintain the pressure in coolant hose, guarantee when cooling down overpressure and raising to be quenched district's pressure release to product gas simultaneously.
In order to protect check-valves, such as, it is destroyed in order to avoid its integrity, the position of check-valves generally temperature in withdrawal well sleeve pipe
Relatively low region, such as, started meter before product pipe perforate section from well head.Described check-valves can be art technology
The known suitable any kind of check-valves of personnel, such as, can be spring stop valve or ball+spring type etc..
According to the present invention, the coolant jet downstream of described coolant hose end is that product gas is quenched district, in order to coolant
Nozzle can spray coolant and be quenched district to product gas, makes product gas be fully contacted with coolant before entering product pipe and mixed
Close and be cooled, it addition, it is also to be stressed that, wherein it is also contemplated that heat effect and/or weight when determining coolant jet position
Relative change in location between it and other parts that stress effect causes, to ensure that coolant jet can spray with continuously effective
To cool down product gas in coolant entrance product gas quenching district downstream.
Specifically, it is proposed, according to the invention, starting meter from well head, for vertical withdrawal well, described coolant jet is positioned at product
Below pipe perforate section, and for horizontal orientation withdrawal well, described coolant jet is generally within the perforate section district of product tube end
In territory.
According to the present invention, described coolant jet can be known to a person skilled in the art suitable any kind of nozzle
Or can carry out specific design, such as can be single-hole nozzle or jet rose, on nozzle, the aperture in each hole be typically greater than
Or equal to 5mm to prevent fouling etc. from causing spray nozzle clogging, the most preferably multiple holes on jet rose, and jet rose are permissible
By center and peripheral distribution, wherein each hole, periphery parallel with centre bore can make the coolant of ejection in the way of narrow focusing
Enter into product gas quenching district, or each hole, periphery can according to angled with centre bore as 5-35 ° of angle, preferred 8-20 °
Dissipate outside angular so that the coolant of ejection enters product gas quenching district with bigger coverage rate, utilizes this specifically chosen or sets
The coolant jet of meter, can make coolant better contact with product gas and mix, make product gas be cooled to mesh quickly
Mark temperature.
According to the present invention, the coolant used can be known to a person skilled in the art suitable any kind of cooling
Agent, the principle being generally basede on cost savings and beneficially product gas post processing selects, and such as, described coolant can be selected from
Water, steam, carbon dioxide, noble gas or liquid and cooling after ambient product gas etc., the injection stream of described coolant
After the general cooling to be reached by expection of amount, product temperature controls, and the injection flow of the most described coolant be enough to make
Product temperature is reduced to below design temperature, and this design temperature is usually 300-350 DEG C.
According to the present invention, when using water and/or carbon dioxide as coolant, they can be grasped by separation on ground
Make to reclaim and process, and withdrawal well can be re-injected subsequently, the most now can realize the recycling of coolant, enter
And saved the running cost of Underground Coal Gasification Process.
It addition, according to the present invention, it is also possible to use the ambient product gas after cooling as coolant, the most do not only have a large amount of
Product gas can be used for this purpose, and any foreign matter will not be introduced completely in product gas, thus greatly simplifie
The last handling process of product gas, this is all extremely advantageous for whole Underground Coal Gasification Process.
According to the present invention, wherein the coolant jet downstream in coolant hose end is that product gas is quenched district, at this product
In gas quenching district, coolant contacts with product gas and mixes, and makes the temperature decrease of described product gas, typically can be by original
700-1000 DEG C is reduced to such as less than 400 DEG C, and the product gas multiparity QC subsequently after cooling down is transported to ground.
According to the present invention, for different withdrawal well types, described product gas quenching district have employed different set-up modes,
With the most more effectively cooling product gas, but it is also to be stressed that, for the design of withdrawal well, especially relate to produce
During relative position between QC itself or other parts with product pipe, it is necessary to consider heat effect and/or the weight of product pipe
Expansion that stress effect causes and/or elongation, though with ensure exist expand and/or still meet during elongation product pipe itself certainly
By degree and with the relative status requirement between other parts.
According to the present invention, for vertical withdrawal well, wherein start meter from well head: sleeve pipe is securing elongated by cement layer
Coal seam near top in coal seam, the length of product pipe perforate section is about 2-3 complete pipeline section, and coolant jet is positioned at product pipe
Below perforate section, thus the product gas quenching district in coolant jet downstream generally within withdrawal well bottom, and this product gas is rapid
Cold-zone crosses with injecting into well bushing pipe perforate section, and in this case, cooled dose of pipe of coolant carries and by coolant jet
Entering product gas quenching district after ejection, the product gas from gasification zone enters the quenching of product gas through injecting into well bushing pipe perforate section
District, coolant contacts in product gas quenching district with product gas and mixes afterwards, it is achieved the cooling of product gas, and the product after cooling down
Product gas multiparity QC is transported to ground.
According to the present invention, for horizontal orientation withdrawal well, described product gas quenching district be generally located on withdrawal well without
In cement layer free pipe section, be connected with anhydrous mud layer free pipe section is without sleeve pipe coal bed drilling section, described coal without sleeve pipe
Layer boring section generally extends to withdrawal well end and in inside equipped with withdrawal well internal lining pipe perforate section, in described withdrawal well
Bushing pipe perforate section is generally used for supporting without sleeve pipe coal bed drilling section to prevent from gasifying without sleeve pipe coal bed drilling section avalanche blocking underground
Passage, crosses with injecting into well bushing pipe perforate section in withdrawal well internal lining pipe perforate section described in withdrawal well end simultaneously, thus from
The product gas of gasification zone enters withdrawal well internal lining pipe perforate section through injecting into well bushing pipe perforate section, enters the quenching of product gas afterwards
District, and then contact with coolant and mix, the product gas multiparity QC after final cooling is transported to ground.
According to the present invention, the withdrawal well internal lining pipe perforate section in the described section of coal bed drilling without sleeve pipe is substantially sacrificial
, it will be burned off during gasifying in withdrawal well direction in coal seam, and therefore its selection is not critically important, typically uses carbon steel
Manage.
Further, it is proposed, according to the invention, for horizontal orientation withdrawal well, for being positioned at anhydrous mud layer free pipe section
Product gas quenching district for, typically can use two kinds of set-up modes, specially guide plate type quenching district and clearance-type quenching
District.
According to the present invention, for the product gas of horizontal orientation withdrawal well is quenched district, when being quenched district according to guide plate type
When arranging, described product pipe perforate section starts to extend to without sleeve pipe coal seam drilling from the starting point of anhydrous mud layer free pipe section
Hole section and the withdrawal well internal lining pipe perforate section internal with it are connected, wherein in product pipe perforate section, preferably away from its terminal
Equipped with deflector with contacting and mixing between enhanced products gas and coolant at about 1-2 complete pipeline section, specifically, lead described in
Stream plate restricted circulation flow while ensureing well system connectivity, thus enters product at product gas through withdrawal well internal lining pipe perforate section
After QC perforate section, the described deflector direct product gas product pipe perforate section part from deflector upstream flows out and cooled dose
The coolant contact of nozzle ejection and mixing, then the product pipe perforate section part through deflector downstream of the product gas after cooling is entered
Entering product pipe and be transported to ground, wherein coolant jet is positioned near described deflector, is preferably placed at described deflector upper and lower
Within swimming 2.0 meters, within being more preferably located at described deflector upstream and downstream 1.0 meters.
According to the present invention, for the product gas of horizontal orientation withdrawal well is quenched district, when coming according to clearance-type quenching district
When arranging, described product pipe perforate section starts to extend from the starting point of anhydrous mud layer free pipe section, but in distance without sleeve pipe coal seam
Stop extending, thus in the interruption of product pipe perforate section Yu withdrawal well internal lining pipe perforate section at the complete pipeline section of boring section about 1-2
Open form becomes an intersegmental gap, and this intersegmental gap is used as product gas quenching district, and product gas is directly entered through withdrawal well internal lining pipe perforate section
The coolant that product gas quenching district sprays with cooled dose of nozzle contacts and mixes, and then the product gas multiparity QC after cooling is opened
Hole section enters product pipe and is transported to ground, and wherein coolant jet is positioned near described product pipe perforate section end, preferably position
Within described product pipe perforate section end upstream and downstream 2.0 meters, it is more preferably located at described product pipe perforate section end upstream and downstream 1.0
Within meter.
Therefore, it is proposed, according to the invention, by combine in withdrawal well equipment the coolant hose with specific coolant jet and
Utilize the product gas quenching district of unique design, immediately and effectively cool the high-temperature product gas of Underground Coal Gasification Process, from
And dramatically reduce the thermic load of described product gas subsequent processes, bring progress for prior art.
The embodiment that it will be convenient to further describe the present invention with respect to the accompanying drawings.
Fig. 1 gives a kind of embodiment of the withdrawal well equipment of the present invention, and wherein said withdrawal well is vertical withdrawal well,
Wherein product gas quenching district is positioned at bottom withdrawal well.As it is shown in figure 1, wherein: from the height of about 700-1000 DEG C of gasification zone
Temperature product gas 11 enters product gas quenching district 10 through injecting into well bushing pipe perforate section 17 and injection well coal bed drilling 16；Coolant exists
At the well head of ground, cooled dose of entrance 13 injects, is downward through check-valves 4 along coolant hose 3 and cooled dose of nozzle 5 is injected into
Enter product gas quenching district 10；Check-valves 4 is provided with unlatching pressure, in so also can guarantee that coolant hose 3 when injecting without coolant
Pressure；Detect the temperature near product pipe perforate section 2 starting point by the temperature sensor in measuring instrument system 7 and feed back to
Control system；Coolant 6 contacts with high-temperature product gas in product gas quenching district 10 and mixes, by product air cooling to 300-
350℃；Product gas multiparity QC perforate section 2 after cooling enters product pipe 1 and multiparity QC outlet afterwards 12 is left well head and set
Standby entrance surface technology pipeline；It is internal that product pipe 1, coolant hose 3 and measuring instrument system 7 are installed in withdrawal well sleeve pipe 8；Set
Pipe 8 is fixed on the neutralization of withdrawal well wellhole by high-temperature water mud layer 9 and extends to coal seam 18 near top from ground pithead position；
Annular space between sleeve pipe 8 inwall and product pipe 1, coolant hose 3 and measuring instrument system 7 can be let out as standby during misoperation
Pressure passageway, now product gas can be by sleeve pipe annular space outlet 15 outflow on wellhead equipment.
Fig. 2 gives another embodiment of the withdrawal well equipment of the present invention, and wherein said withdrawal well is horizontal orientation
Withdrawal well, wherein product gas quenching district is positioned at withdrawal well anhydrous mud layer free pipe section end, wherein in product pipe perforate section
It is provided with deflector and carrys out contacting and mixing between enhanced products gas and coolant.As in figure 2 it is shown, wherein: product gas quenching district 10
It is positioned at the end of withdrawal well anhydrous mud layer free pipe section 20；From high-temperature product gas 11 warp of about 700-1000 DEG C of gasification zone
Withdrawal well internal lining pipe perforate section 23 and withdrawal well coal bed drilling 21 flow into product pipe perforate section 2；It is arranged in product pipe perforate section 2
The deflector 19 direct product gas in portion enters product gas quenching district 10, contacts with coolant wherein and mixes, afterwards product gas
Product pipe perforate section through deflector 19 downstream is partially into product pipe 1 together with coolant；Detected by measuring instrument system 7
Temperature near product pipe perforate section 2 starting point also feeds back to control system, thus controls the coolant flow of coolant entrance 13,
Make this temperature less than setting value (such as 300-350 DEG C).For horizontal orientation withdrawal well, sleeve pipe 8 is solid by high-temperature water mud layer 9
Being scheduled in wellhole, described high-temperature water mud layer starts to extend to the position parallel with seat earth from ground pithead position.
Fig. 3 gives another embodiment of the withdrawal well equipment of the present invention, and wherein said withdrawal well is horizontal orientation
Withdrawal well, wherein product gas quenching district is positioned at withdrawal well anhydrous mud layer free pipe section end and by product pipe perforate section and output
Gap between well internal lining pipe perforate section is formed.As it is shown on figure 3, wherein: at the end of withdrawal well anhydrous mud layer free pipe section 20
Portion, product pipe perforate section 2 and a separated intersegmental gap 22 of withdrawal well internal lining pipe perforate section 23, it is rapid that this gap 22 forms product gas
Cold-zone 10, contacts with high-temperature product gas at this coolant and mixes；Remaining part is basically identical with Fig. 2.
The invention is not limited in embodiments described above, for a person skilled in the art, the present invention also may be used
To have various change and adjustment, without departing from the spirit and principles in the present invention, described change and adjustment all should be at models of the present invention
In enclosing.
Claims (18)
1. for the withdrawal well equipment of Underground Coal Gasification Process, described withdrawal well equipment include wellhead equipment and sleeve pipe with
And it is positioned at the product pipe of sleeve pipe, coolant hose and measuring instrument system, wherein:
Described sleeve pipe is used for reinforcing and isolate withdrawal well wellhole, and it uses box cupling and screw thread are attached and are fixed by cement layer
In withdrawal well wellhole；
The product gas that described product pipe is used for producing gasification is from withdrawal well delivered downhole to ground, and it is provided with perforate in end
Section；
Described coolant hose for being injected into the product gas that withdrawal well down-hole produces with cooling gasification by coolant, and it is in end even
It is connected to coolant jet；
Described measuring instrument system downwardly extends from well head and is fixed near product tube end perforate section starting point, including setting
Put temperature, pressure and the sonic sensor in protection sleeve pipe；With
Described wellhead equipment air-tightness blocks described sleeve pipe and includes the instrument pressed joint port for measuring instrument system, use
The outlet of product gas outlet in product pipe, the sleeve pipe annular space for sleeve pipe and the coolant entrance for coolant hose；
Being wherein that product gas is quenched district in coolant jet downstream, wherein gasify the product gas and cooled dose of nozzle ejection produced
Coolant contact and mixing and be cooled, condition is intended heat effect and/or gravitational effect causes expansion and/or elongation
Do not affect the relative position between degree of freedom and each parts of each parts itself.
2. the withdrawal well equipment described in claim 1, also includes well mouth hanger, and described well mouth hanger is in center
Free suspension product pipe with at eccentric position parallel free suspension coolant hose.
3. the withdrawal well equipment described in claim 1 or 2, wherein the length of product tube end perforate section is about 1-4 complete pipe
Section, open pore size is 5-35mm, preferred 10-25mm, and described perforate is staggered to be spaced, and the perforate gross area is perforate section tube wall
The 5-35% of area, preferred 10-30%.
4. the withdrawal well equipment described in any one of claim 1-3, is wherein also equipped with one or more stopping in coolant hose
Returning valve is used for preventing inverted draft from entering coolant hose, and the position of described check-valves starts meter from well head and is positioned at product tube end and opens
Before the section of hole.
5. the withdrawal well equipment described in any one of claim 1-4, wherein said coolant jet is that aperture is more than or equal to 5mm
Single-hole nozzle or jet rose, the wherein multiple Kong An centers on jet rose and each hole of peripheral distribution and periphery and centre bore
Parallel or according to become with centre bore 5-35 ° of angle, preferred 8-20 ° angular outer dissipate.
6. the withdrawal well equipment described in any one of claim 1-5, described withdrawal well is vertical withdrawal well, wherein from the beginning of well head
Meter: described sleeve pipe is securing elongated to coal seam near top by cement layer；The length of described product tube end perforate section is about 2-3
Individual complete pipeline section；Described coolant jet is positioned at below product tube end perforate section；It is positioned at output with described product gas quenching district
Bottom.
7. the withdrawal well equipment described in any one of claim 1-6, described withdrawal well is horizontal orientation withdrawal well, wherein from well head
Start meter: described sleeve pipe is securing elongated attached near horizontal level in coal seam or the position parallel with seat earth by cement layer
Closely, the free pipe section of the most anhydrous mud layer, is finally to extend to withdrawal well end, wherein without sleeve pipe coal bed drilling section
Without sleeve pipe coal bed drilling section built with withdrawal well internal lining pipe perforate section；It is positioned at withdrawal well cement-free with described product gas quenching district
In layer free pipe section.
8. the withdrawal well equipment described in claim 7, wherein said product gas quenching district is that guide plate type is quenched district, wherein said
Product pipe perforate section from the starting point of anhydrous mud layer free pipe section start to extend to without sleeve pipe coal bed drilling section and and its
Internal withdrawal well internal lining pipe perforate section is connected, wherein in product pipe perforate section, preferably away from its terminal about 1-2 complete pipe
Equipped with deflector with contacting and mixing between enhanced products gas and coolant at Duan, wherein said coolant jet is positioned at described
Near deflector, within being preferably placed at described deflector upstream and downstream 2.0 meters, it is more preferably located at described deflector upstream and downstream 1.0 meters
Within.
9. the withdrawal well equipment described in claim 7, wherein said product gas quenching district is that clearance-type is quenched district, wherein said product
QC perforate section starts to extend from the starting point of anhydrous mud layer free pipe section, but in distance without sleeve pipe coal bed drilling section about 1-2
Stopping extending at complete pipeline section, the gap between product pipe perforate section and withdrawal well internal lining pipe perforate section is used as product gas and is quenched
District, wherein coolant jet is positioned near described product pipe perforate section end, is preferably placed on described product pipe perforate section end
Within 2.0 meters of downstream, within being more preferably located at described product pipe perforate section end upstream and downstream 1.0 meters.
10. a coal underground gasification method, is wherein provided with the completion system for underground coal gasification(UCG) in subterranean coal, its
The middle withdrawal well equipment utilizing any one of claim 1-9, the most cooled dose of pipe injects coolant with cold to withdrawal well down-hole
But gasify produce product gas and cooling after product gas multiparity QC be transported to ground, described coolant selected from water, steam,
Ambient product gas after carbon dioxide, noble gas or liquid and cooling, and the injection flow of coolant be enough to make down-hole produce
Product temperature is reduced to below setting value.
Method described in 11. claim 10, wherein said measuring instrument system obtains temperature, pressure and the sound wave in withdrawal well
Signal also feeds back to the control system near well head, and wherein temperature signal is used for controlling coolant flow, pressure signal for supervising
Survey withdrawal well down-hole pressure and acoustic signals is used for monitoring withdrawal well down-hole situation, wherein said temperature, pressure and sound wave sensing
Device is distributed sensing optical fiber based on fiber optical time domain reflection measurement technology, and described temperature sensor is additionally or alternatively
Bimetallic sheath K-type dual probe thermocouple, wherein temperature and/or withdrawal well well head temperature near product tube end perforate section starting point
Degree cuts off oxidant immediately and injects stopping gasification when exceeding their setting value.
Method described in 12. claim 10 or 11, wherein the annular space between internal surface of sleeve pipe and each pipe fitting at ignition phase with lazy
Property gas purge and block to prevent product gas and/or coolant from entering wherein, and be used as well system when abnormal running
Pressure release passage bears excess pressure preventing stratum/coal seam.
Method described in 13. any one of claim 10-12, wherein for vertical withdrawal well, is positioned at the product bottom withdrawal well
Gas quenching district crosses with injecting into well bushing pipe perforate section, and the product gas produced that thus gasifies enters through injecting into well bushing pipe perforate section
Product gas quenching district contacts with coolant and mixes and multiparity QC is transported to ground after the cooling period.
Method described in 14. any one of claim 10-12, wherein for horizontal orientation withdrawal well, without sleeve pipe coal bed drilling
Withdrawal well internal lining pipe perforate section in Duan crosses with injecting into well bushing pipe perforate section, and the product gas produced that thus gasifies is through injecting well
Internal lining pipe perforate section enter withdrawal well internal lining pipe perforate section, afterwards enter product gas quenching district contacts with coolant and mixes and
Multiparity QC is transported to ground after the cooling period.
Method described in 15. claim 14, wherein when product gas quenching district is guide plate type quenching district, product gas is through output
Well internal lining pipe perforate section enters product pipe perforate section, the product pipe perforate by deflector upstream of the described deflector direct product gas
The coolant that section part flows out with cooled dose of nozzle ejection contacts and mixes, and then the product gas after cooling is through deflector downstream
Product pipe perforate section be partially into product pipe and be transported to ground.
Method described in 16. claim 14, wherein when product gas quenching district is clearance-type quenching district, product gas is through withdrawal well
Internal lining pipe perforate section is directly entered the coolant that sprays with cooled dose of nozzle of product gas quenching district and contacts and mix, and then cools down
After product gas multiparity QC perforate section enter product pipe be transported to ground.
Method described in 17. any one of claim 10-16, wherein use water and/or carbon dioxide are as coolant, described water
And/or carbon dioxide re-injects withdrawal well after ground is reclaimed and processed, thus it is recycled as coolant.
Method described in 18. any one of claim 10-16, wherein use the ambient product gas after cooling as coolant, by
This is avoided introducing any foreign matter in product gas and simplifying product gas last handling process.
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| CN201610712514.9A CN106089179B (en) | 2016-08-24 | 2016-08-24 | For the withdrawal well equipment of Underground Coal Gasification Process and its application |
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| CN201610712514.9A CN106089179B (en) | 2016-08-24 | 2016-08-24 | For the withdrawal well equipment of Underground Coal Gasification Process and its application |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106522914A (en) * | 2016-11-18 | 2017-03-22 | 中为（上海）化学有限公司 | Underground gasifier quenching and burnt-out area restoration treatment method for coal underground gasification process |
| WO2018035733A1 (en) * | 2016-08-24 | 2018-03-01 | 中为(上海)能源技术有限公司 | Production well apparatus for underground coal gasification and use thereof |
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| CN115467644A (en) * | 2022-11-02 | 2022-12-13 | 华运隆腾机械制造有限公司 | Corrosion-resistant carbon dioxide gas production wellhead device |
| CN115467644B (en) * | 2022-11-02 | 2023-02-10 | 华运隆腾机械制造有限公司 | Corrosion-resistant carbon dioxide gas production wellhead device |
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