CN109025950A - Optical-fiber laser ignition system and its operating method for coal underground gasifying technology - Google Patents
Optical-fiber laser ignition system and its operating method for coal underground gasifying technology Download PDFInfo
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- CN109025950A CN109025950A CN201811090784.6A CN201811090784A CN109025950A CN 109025950 A CN109025950 A CN 109025950A CN 201811090784 A CN201811090784 A CN 201811090784A CN 109025950 A CN109025950 A CN 109025950A
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- 238000002347 injection Methods 0.000 claims abstract description 95
- 239000007924 injection Substances 0.000 claims abstract description 95
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- 239000000835 fiber Substances 0.000 claims abstract description 42
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- 230000003068 static effect Effects 0.000 claims abstract description 22
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- 238000002309 gasification Methods 0.000 claims description 40
- 238000000034 method Methods 0.000 claims description 36
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- 238000009434 installation Methods 0.000 claims description 23
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- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 5
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- UBAZGMLMVVQSCD-UHFFFAOYSA-N carbon dioxide;molecular oxygen Chemical compound O=O.O=C=O UBAZGMLMVVQSCD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 2
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- 241000883990 Flabellum Species 0.000 description 3
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- 238000010586 diagram Methods 0.000 description 3
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- 239000004215 Carbon black (E152) Substances 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910000863 Ferronickel Inorganic materials 0.000 description 1
- 229910000792 Monel Inorganic materials 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
Abstract
The present invention provides a kind of optical-fiber laser ignition systems for being used for coal underground gasifying technology (ISC), including such as lower component: on board unit, including generator or power supply, for energy needed for providing igniting, and laser source, for converting electrical energy into laser；One or more armored fiber optic cable strings, transmission for laser, dynamic is mounted in coiled tubing unit, the position of required ignition point is delivered to by coiled tubing or static state is mounted on the scheduled ignition point position of injection well bushing pipe/injection casing, position and the subsequent ignition point position being pre-designed including the first ignition point；One optical fibre laser head, for laser guide and target coal seam is lighted, the oxidant conveying equipment end or static state that dynamic corresponding with fiber optic cables string is directly anchored in coiled tubing unit are directly anchored to injection well bushing pipe/injection well outside of sleeve armored fiber optic cable string end；On board unit is attached with fiber optic cables string by quick connector or optical fiber slip ring.
Description
Technical field
The present invention provides a kind of optical-fiber laser ignition system for coal underground gasifying technology (ISC) and operation sides
Method.Particularly, the optical-fiber laser igniting that the present invention provides a kind of can repeatedly to be lighted a fire in coal underground gasifying technology
System additionally provides operating method of this optical-fiber laser ignition system in coal underground gasifying technology, is particularly used in coal
The initial explosion of charcoal underground gasification process, again and repeatedly ignition process.
Background technique
Underground coal gasification(UCG) (ISC) is by the burning of subterranean coal and gasification reaction that coal is direct in the presence of an oxidizer
It is converted into the process of product gas, the product gas is commonly referred to as synthesis gas, which can be subsequently used as the original of a variety of applications
Material, including fuel production, chemicals production and power generation etc..This coal underground gasification technology is all applicable for most of coal deposits
's.Relevant cost of labor and capital construction cost, this skill are increasingly stringenter and considered in view of the environmental requirement in relation to mining industry
Art is undoubtedly very attractive.Coal gasification process is the mistake that coal is changed into synthesis gas by a series of chemical reaction
Journey.Wherein main react includes:
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)
Ground drilling leads directly to coal seam, and the injection of oxygen supply agent and product gas output provide effective channel.A pair of of drilling well is in underground
Connection or horizontal extension constitute a substantial horizontal drilling channel (can be also simply referred to as coal seam hoistway or communicating passage).The channel
Facilitate oxidant injection, burned out area growth and product gas conveying.One drilling well for oxidant injection is known as " injection well ",
Another drilling well for being used to produce product gas is known as " product well ".Orientation horizontal drilling and vertical drilling all can be used as injection well
Or product well.Underground coal gasification(UCG) (ISC) may also need to hang down using to one or more between injection well and product well
Straight well (such as: functional well and service well).
When having injection well, product well and horizontal channel to connect the two in coal seam, this construction is referred to as a coal
Charcoal underground gasification (ISC) unit or well pair.ISC unit includes combustion zone, gasification zone and pyrolysis zone.Wherein, combustion zone is in coal seam
Near middle oxidant decanting point；Gasification zone is centered around around combustion zone or in combustion zone downstream in the form of radial, and coal exists
Gasification zone is gasified, is partially oxidized, to generate product gas；Pyrolysis zone generally exists in gasification zone downstream, the pyrolytic reaction of coal
Here occur.The product gas of high temperature is finally transported to ground from product well well head from gasification zone toward downstream flow.In coal combustion
Or while gasification, the ISC burned out area in coal seam, which can be grown, to become larger.
Synthesis gas (CO, CO are usually contained by the product gas (crude synthesis gas) that underground coal gasification(UCG) generates2, H2, CH4And its
The mixture of his gas) and other compositions solid particle, water, coal tar, hydrocarbon vapours, other microcomponents include H2S,
NH4, COS etc.).Its complicated component degree depend on many aspects: oxidant used in underground coal gasification(UCG) (air or other
Oxidant, such as oxygen, oxygen-enriched air or vapour mixture), the inherent water in coal seam or surrounding formations penetrate into water in coal seam,
The operating parameter of coal quality and coal underground gasifying technology, including temperature, pressure etc..
According to existing patent document, coal underground gasification technology problem encountered is specifically included that at present
A) for coal seam first and subsequent light a fire again safe and reliable and there is cost-benefit ignition installation.
B) have patent in many ignition systems and method distance very long or well depth it is very deep when be it is not practical/no
It is possible, such as electrical heating elements can be because conductor cause voltage to decline too much when apart from too long.Inflammable and explosive igniting is set
For in terms of material processing and activation, also there are many challenges always.
C) most of traditional systems need real from main oxygen delivery equipment or multiple wells (cable, conjugation tube, E line, continuous pipe)
More special operation is applied, to realize igniting.
D) enough heats cannot be provided to overcome bushing pipe/casing own combustion heat loss, and be difficult to heat is direct
Target coal seam is focused on, causes the multiple ignition difficulties in bushing pipe/casing huge.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of optical-fiber laser points in coal underground gasifying technology
Fiery system additionally provides operating method of this ignition system in the single or multiple ignition phases of coal underground gasifying technology.
The technical solution adopted by the present invention to solve the technical problems is:
For the optical-fiber laser ignition system of coal underground gasifying technology, based on injection well bushing pipe or injection casing conduct
Movable passageway, the optical-fiber laser ignition system include such as lower component:
On board unit, including generator or power supply, for energy and laser source needed for providing igniting, being used for will be electric
Laser can be converted into；
The armored fiber optic cable string of one or more dynamic installations or static installation, the transmission for laser；
A) it is mounted in coiled tubing unit, the position of required ignition point is delivered to by coiled tubing, referred to as dynamic is pacified
Dress；
B) it is mounted on the scheduled ignition point position of injection well bushing pipe/injection casing, the position including the first ignition point
With the subsequent ignition point position being pre-designed, referred to as static installation；
The optical fibre laser head of one dynamic installation or static installation, for laser guide and lights target coal seam.
A) dynamic is installed: being directly installed on the oxidant conveying equipment end in coiled tubing unit.
B) static installation: it is directly installed on injection well bushing pipe/injection well outside of sleeve armored fiber optic cable string end.
On board unit and fiber optic cables string pass through quick connector or optical fiber in optical-fiber laser ignition system of the present invention
Slip ring is attached.When being installed using dynamic, fiber optic cables string passes through the oxidation in quick connector and coiled tubing unit
The connection of agent conveying equipment, oxidant conveying equipment by external grapples connector or quick connector or have with optical fibre laser head
Bayonet/positioning bolt screw thread or flange bolt realize that non-solder connects and provides effective ground vapour close property sealing.Namely optical fiber electricity
Cable string is mounted in coiled tubing, and coiled tubing end is oxidant conveying equipment, and oxidant conveying equipment is connected to continuous oil
Pipe end, optical fibre laser head are mounted on the end of oxidant conveying equipment, and using grapple or quick connector, fiber optic cables string is worn
Peroxide agent conveying equipment.When using static installation, fiber optic cables string is directly connected with optical fibre laser head by quick connector
It connects and is fixed on injection well bushing pipe/injection casing outside.
Air, oxygen-enriched air, oxygen, carbon dioxide or nitrogen can be used as laser in optical fibre laser head of the present invention
Auxiliary guiding carrier gas, the oxidant of gasification can use air, oxygen-enriched air or oxygen.Wherein, carrier gas and oxidation are guided
The transfer passage of agent are as follows: coiled tubing inner passage, coiled tubing and injection well bushing pipe/injection casing annular space and injection
Well bushing pipe/injection casing and coal bed drilling annular space.
The operating method of optical-fiber laser ignition system of the present invention, based on having been provided with ISC well pair in subterranean coal
Completion system, the operating method are as follows:
1. dynamic installation ignition method:
A. optical fibre laser head is advanced by predetermined ignition position by coiled tubing；
B. guiding carrier gas is injected by coiled tubing, and adjusts direction to the predetermined coal seam position of optical fibre laser head；
C. oxidant is injected by coiled tubing and injection well bushing pipe/injection casing annular space channel；
D. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
E. after lighting a fire successfully, recession equipment to home；
F. oxidant is injected by coiled tubing, implements underground coal gasification(UCG)；
G. pass through the above-mentioned a-f step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well bushing pipe direction
All coal deposits.
2. Static mounting points ignition method:
A. more a optical fibre laser heads have been mounted on predetermined coal seam ignition location；
B. by the injection guiding carrier gas of the annular space channel of injection well bushing pipe/injection casing and coal bed drilling, and light is adjusted
The direction of fine laser head to predetermined coal seam position；
C. oxidant is injected by injection well bushing pipe/injection casing inner passage；
D. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
E. increase oxidant injection flow and pressure, implement underground coal gasification(UCG)；
F. pass through the above-mentioned a-e step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well bushing pipe direction
All coal deposits.
Beneficial effects of the present invention:
According to the present invention, in the coal underground gasification method, in the case where ignition phase breaks down, Huo Zhe
In the case that the interruption of generation coal seam is unable to continuous gasification in gasification, it can use ignition installation of the invention and carry out point again
Fire, including regnition and repeatedly igniting, until lighting coal seam again, to ensure that the final reality of Underground Coal Gasification Process
It applies.
According to the present invention, when carrying out Underground Coal Gasification Process using optical-fiber laser ignition system of the invention, no longer
It needs directly to implement secondary and multiple ignition process in the case where interrupting Underground Coal Gasification Process, technological operation is more flexible
It is convenient, to realize the continuous and steady operation of coal underground gasifying technology, progress is brought for the prior art.
Detailed description of the invention
Fig. 1 is the schematic diagram of a complete Dynamic Optical Fiber Laser Ignition System, including laser source, coiled tubing unit and
The details of underground equipment component and subsurface environment, it is shown that injection well bushing pipe/injection casing and coal seam.
Fig. 2 is the schematic diagram of a complete stationary laser spot fire system；
Fig. 3 is the schematic diagram of an optical fibre laser head internal rotating head.
In the drawings, identical appended drawing reference refers to same parts.Specifically, appended drawing reference meaning involved in each attached drawing
It is as follows:
1. generator/power supply, 2. laser light sources, 3. fiber optic cables, 4. quick connectors or optical fiber slip ring, 5. coiled tubings
Unit, 6. coiled tubings (containing fiber optic cables and other service equipments), 7. well heads, 8. injection casing/injection well bushing pipes, 9. connect
The details of continuous oil pipe underground part, 10. coal seams, 11. complete underground laser equipment sectional views, 12. laser equipments decomposes section
Figure, 13. laser beams, 14. spring cups/trapdoor, 15. reflectors/mirror, the flow path of 16. oxidants and are led at 17. laser
The flow path of bleed body, 18. laser lens, 19. rotating laser head main bodys, 20. rotating transmission devices, 21. fiber optic cables
(being fixedly mounted on injection casing/injection well bushing pipe), 22. first ignition points, 23. second ignition points, more than 24. times/last
Ignition point, 25, flabellum, 26, transmission gear, 27, braking latch pin, 28, spring.
Specific embodiment
Below by specific embodiment, and in conjunction with attached drawing, technical scheme of the present invention will be further explained in detail.
For the optical-fiber laser ignition system of coal underground gasifying technology, it is based on injection well bushing pipe/injection casing conduct
Movable passageway, the optical-fiber laser ignition system include such as lower component:
1. on board unit, including generator/power supply, for energy needed for providing igniting, laser source, for turning electric energy
Turn to laser；
2. one or more armored fiber optic cable strings can be distinguished for the transmission of laser:
It 2a) is mounted in coiled tubing unit, the position of required ignition point is delivered to by coiled tubing, referred to as dynamic is pacified
Dress；
It 2b) is mounted on the scheduled ignition point position of injection well bushing pipe/injection casing, the position including the first ignition point
With the subsequent ignition point position being pre-designed, referred to as static installation；
3. an optical fibre laser head for laser guide and is lighted target coal seam, can be distinguished:
3a) dynamic is installed: according to above-mentioned 2a) it is directly installed on coiled tubing unit internal oxidition agent conveying equipment end.
3b) static installation: according to above-mentioned 2b) it is directly installed on injection well bushing pipe/injection well outside of sleeve armored fiber optic
Cable string end.
For the completion system for coal underground gasifying technology ISC well pair, injection well bushing pipe/injection casing is very heavy
The component part wanted is the important channel of ignition process and the flowing of gasification kind fluid in coal underground gasifying technology.According to
The present invention injects into well bushing pipe and belongs to sacrifice consumables, and usual situation carbon steel or the above material can meet operating environment requirement.
Meanwhile according to the property of coolant, a degree of preservative treatment need to be carried out to bushing pipe inner wall is injected into well.Inject into well bushing pipe
Size be generally 4.5,5.0,5.5,6.0,6.625 or 7.0 inches.Its pipe thickness (internal diameter) can according to lithostatic pressure and
Hydrostatic pressing, flow of coolant etc. carry out type selecting.The connection type for injecting into well bushing pipe is preferential as highest using last complete well performance
Welded connecting, threaded connection, the connection of clip groove, flanged joint, bite type connection or card pressure connection etc. can be selected in grade.
On board unit in technical solution of the present invention, including generator/power supply and laser source.Wherein generator/power supply
For energy and laser source needed for providing igniting for converting electrical energy into laser.It is convenient for using vehicle-mounted mode in multiple undergrounds
It is moved between gasification furnace group or ISC well pair, for extensive coal underground project implementation igniting service.At the scene in operating process,
When on board unit is relocated to new well to position, reusing equipment will be more easier.
On board unit and one or more armored fiber optic cable strings in technical solution of the present invention pass through quick connector
Or optical fiber slip ring is attached.Wherein, one or more armored fiber optic cable strings include that at least triple layer armoured protection sheath is for example stainless
Steel 316L, al and ni evanohm 825 and resistance hydrogen solvent such as hinder hydrogen cream without gel.Meanwhile it can be according to actual working conditions, described
The thicker continuous pipe of installation wall is on armored fiber optic cable string to ensure the fiber optic cables string for high temperature and pressure pure oxygen environment.Institute
It states armored fiber optic cable string outer diameter and is generally 1/8-1 inches.Each fiber optic cables can provide the laser power of 2-10kW.It is preferred that 2-
5kw。
One or more armored fiber optic cable string mounting means in technical solution of the present invention are according to underground coal gasification(UCG)
Process choice.It is installed using dynamic, fiber optic cables string is mounted on inside coiled tubing, is delivered to required igniting by coiled tubing
The position of point；It is installed using static state, fiber optic cables string is mounted on the scheduled ignition point position of injection well bushing pipe/injection casing
On, position and the subsequent ignition point position being pre-designed including the first ignition point.
Optical fibre laser head in technical solution of the present invention for laser guide and lights target coal seam.Pacified using dynamic
Dress, the laser head after light a fire successfully can Reusability, select the special two-phase steel of high-temperature resistant anti-corrosive, such as the conjunction of chromium ferronickel
Gold, Monel, tungsten alloy etc.；It is installed using static state, the laser head belongs to consumables in ignition process, selects
Ordinary carbon steel and the above material.
Optical fibre laser head in technical solution of the present invention, including at least one mirror/reflective device, laser lens and spring
Lid/trapdoor.Wherein mirror/reflective device is used to shift and adjust the direction of the launch (small range) of laser, and laser lens are for adjusting
The diameter and area of whole laser beam, spring cup/trapdoor is for protecting optical fiber in optical-fiber laser ignition system transmission process
Laser head.
Wherein the optical fibre laser head can generate mechanical rotation by oxidant/guidance carrier gas stream.The rotation can be into
Row adjusts so that part or whole optical fibre laser head carries out circular motion (a wide range of).In oxidant/guidance carrier gas stream flowing
Before, swivel head will not be engaged with gear assembly.When oxidant/guidance carrier gas stream is activated, pass through flabellum and tooth
Wheel transmission device, so that optical fibre laser head carries out 0-180 degree circular motion (preferably 30-120 degree), adjustment Laser emission direction is extremely
Predetermined ignition position.Bolt is pushed to implement braking by adjusting oxidant/guidance carrier gas stream operating pressure, it can fixed laser
The direction of the launch implements fixed point igniting.If abnormal conditions occurs in underground, it can be not fixed Laser emission direction, directly implementation 0-180 degree
The large area of circular motion is lighted a fire and cutting injection well bushing pipe/injection casing.
Optical fibre laser head mounting means in technical solution of the present invention is selected according to coal underground gasifying technology.Using dynamic
State installation, fiber optic cables string are connect by quick connector with the oxidant conveying equipment in coiled tubing unit, and oxidant is defeated
Send equipment and optical fibre laser head by external grapples connector or quick connector or with bayonet/positioning bolt screw thread or method
Blue bolt realizes that non-solder connects and provides effective ground vapour close property sealing；It is installed using static state, fiber optic cables string is by quickly connecting
It connects device and is directly connected and fixed to injection well bushing pipe/injection casing outside with optical fibre laser head.
Air, oxygen-enriched air, oxygen, carbon dioxide or nitrogen can be used in optical fibre laser head in technical solution of the present invention
Auxiliary as laser guides carrier gas, and the oxidant of gasification can use air, oxygen-enriched air or oxygen.Wherein, it guides
The transfer passage of carrier gas and oxidant are as follows: coiled tubing inner passage, coiled tubing and injection well bushing pipe/injection casing ring
Gap and injection well bushing pipe/injection casing and coal bed drilling annular space.
According to the present invention, in the optical-fiber laser ignition system, when pass through ground on-vehicle power initiation optical-fiber laser point
After fiery system, the laser energy generated in ignition process is enough to burn injection well bushing pipe/injection casing, evaporate at ignition location
Free water and inherent water and promotion coal seam temperature in coal seam is final to realize coal seam igniting to ignition point.Meanwhile it is adjustable
The presence of optical fibre laser head can directly adjust laser to scheduled ignition location, avoid in injection well bushing pipe/injection casing
Free water evaporates consumed energy in ignition process.Therefore, it is proposed, according to the invention, in the optical-fiber laser ignition system,
Energy and the igniting of optical fibre laser head release can be changed by adjusting the generator on board unit/power work time
Time etc., to optimize the ignition process of underground coal gasification(UCG).
According to experiment measure, using single fiber optic cable conveying 2-10kW laser, the duration of ignition about 10-40 seconds, it is sufficient to
It burns injection well bushing pipe/injection casing and heating coal seam reaches ignition point.According to four fiber optic cables string transmission lasers
(8-40kW), the duration of ignition are 5-20 seconds, and coal seam ignition point area and injection well bushing pipe/injection casing hole burning area can be improved
3-4 times, greatly improve the ignition effectiveness and quality in coal underground gasifying technology.
The operating method of optical-fiber laser ignition system of the present invention, based on having been provided with ISC well pair in subterranean coal
Completion system, the operating method are as follows:
1. the ignition method that dynamic installs optical-fiber laser ignition system:
A. optical fibre laser head is advanced by predetermined ignition position by coiled tubing；
B. guiding carrier gas is injected by coiled tubing, and adjusts direction to the predetermined coal seam position of optical fibre laser head；
C. oxidant is injected by coiled tubing and injection well bushing pipe/injection casing annular space channel；
D. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
E. after lighting a fire successfully, recession equipment to home；
F. oxidant is injected by coiled tubing, implements underground coal gasification(UCG)；
G. pass through the above-mentioned a-f step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well bushing pipe direction
All coal deposits.
Wherein, in the ignition method of the dynamic installation optical-fiber laser ignition system, it is preferred to use oxidant (air, richness
Oxygen air or oxygen) directly as the guiding carrier gas of laser.Therefore, underground coal gasification(UCG) normal productive process can not interrupted
In the case where directly lower carry out secondary/multiple igniting.
2. the ignition method of static state installation optical-fiber laser ignition system:
A. more a optical fibre laser heads have been mounted on predetermined coal seam ignition location；
B. by the injection guiding carrier gas of the annular space channel of bushing pipe/casing and coal bed drilling, and the side of optical fibre laser head is adjusted
To extremely predetermined coal seam position；
C. oxidant is injected by injection well bushing pipe/injection casing inner passage；
D. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
E. increase oxidant injection flow and pressure, implement underground coal gasification(UCG)；
F. pass through the above-mentioned a-e step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well bushing pipe direction
All coal deposits.
Wherein, in the ignition method of the static installation optical-fiber laser ignition system, it is preferred to use nitrogen or carbon dioxide
It, can be to avoid the coal seam lighted in secondary/multiple ignition process except predetermined ignition position as the guiding carrier gas of laser.
When implementing underground coal gasification(UCG) ignition process using optical-fiber laser ignition system of the invention and operating method, can lead to
It crosses to shorten and implements the time and improve safety, quality and the integrality of ignition process to improve entire coal underground gasifying technology
Production efficiency, while cost can be reduced, especially implement ISC project in remote districts.
The embodiment that it will be convenient to further describe the present invention with respect to the accompanying drawings.
Fig. 1 gives a dynamic installation optical-fiber laser ignition system.One trolley set generator or electric storage device 1 are laser
Source unit 2 provides energy.Laser is output in armored fiber optic cable string 3 by the laser source unit 2, which includes
One or more optical fiber, and connect the optical fiber slip ring or quick connection assembly 4 being mounted on coiled tubing unit 5.In continuous oil
Inside pipe unit 5, optical fiber below well head 76 internal operation of coiled tubing.In underground, coiled tubing 6 injection casing/
Conveying in injection well bushing pipe 8.Identical coiled tubing 9 is finally run in 10 injection casing/injection well bushing pipe in coal seam, and
Terminate at underground equipment 11.The underground equipment has shows 12 in more detail.The equipment is used to laser beam 13 being exposed to injection well
On casing/injection well bushing pipe 8 and coal seam 10.Laser opening is protected by spring cup/trapdoor 14 of loading spring.Laser is by one
Reflector/mirror 15 shifts, and las er-guidance carrier gas and oxidant will force trapdoor to be opened by flow path 16 or 17.Swashing
It needs first to activate las er-guidance carrier gas and oxidant before ground on-vehicle unit transmitting laser living to prevent damage spring cup/trap
Door 14.Laser lens 18 are for changing laser beam spot sizes and shape.At this point, laser does not need small focus point, it can lead to
The light area of pictural surface of bigger focal zone and distortion is crossed to manufacture bigger aperture on casing/bushing pipe 8.The optical-fiber laser
Head includes rotating laser head main body 19 and rotating transmission device 20, is adjusted by activation las er-guidance carrier gas and oxidant and solid
Fixed rotatable laser head main body 19 to predetermined ignition locality starts to light a fire.Rotating transmission device 20 is as shown in figure 3, laser
It guides carrier gas and oxidant and gear 26 is driven by flabellum 25, laser head main body 19 carries out 0-180 degree circular motion and adjusts laser
The direction of the launch.The braking latch pin 27 equipped with certain load spring 28 is pushed by increasing guiding carrier gas/oxidant operating pressure
Carry out the fixed laser direction of the launch and carries out subterranean coal igniting.After lighting a fire successfully, set by the recession laser ignition of coiled tubing unit 5
Home to the utmost implements Underground Coal Gasification Process.
Fig. 2 gives a static installation optical-fiber laser ignition system, has on board unit 1 and 2 identical with Fig. 1.?
Fiber optic cables 3 are mounted with by well head 7 during its drilling and well completion process.Fiber optic cables are mounted on outside casing/bushing pipe, and are inserted
Enter underground 21, into the horizontal segment target area in coal seam.The fiber optic cables installed include multi-cable string, which only shows it
In one.The end of every optical cable all connects a simplified optical fibre laser head design, without rotation, and includes one pneumatic
Lid.The equipment is consumables, not reproducible use.The equipment does not need to burn casing/bushing pipe yet, can directly light target
Coal seam.Oxidant/guidance carrier gas stream assists to light a fire to blow pneumatic lid off.Entire static installation optical-fiber laser igniting
System can be previously provided with the first ignition point 22, the second ignition point 23 and multiple/last ignition point 24, and can have and be more than
Three ignition points.
Above-mentioned embodiment is only a preferred solution of the present invention, not the present invention is made in any form
Limitation, there are also other variations and modifications on the premise of not exceeding the technical scheme recorded in the claims.For this field
Technical staff for, without departing from the spirit and principles in the present invention, it is described variation and adjustment should all be within the scope of the present invention.
Claims (9)
1. the optical-fiber laser ignition system of coal underground gasifying technology is used for, based on injection well bushing pipe or injection casing as shifting
Dynamic channel, which is characterized in that the optical-fiber laser ignition system includes such as lower component:
On board unit, including generator or power supply, for energy and laser source needed for providing igniting, for turning electric energy
Turn to laser；
One or more armored fiber optic cable strings are dynamically mounted in coiled tubing unit, for the transmission of laser by continuous
Oil pipe is delivered to the position of required ignition point or static state is mounted on the scheduled ignition point position of injection well bushing pipe/injection casing
On, position and the subsequent ignition point position being pre-designed including the first ignition point；
One optical fibre laser head for laser guide and lights target coal seam, and dynamic corresponding with fiber optic cables string is directly fixed
In coiled tubing unit oxidant conveying equipment end or static state be directly anchored to outside injection well bushing pipe/injection casing
The armored fiber optic cable string end of side；
On board unit is attached with fiber optic cables string by quick connector or optical fiber slip ring.
2. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 1, which is characterized in that when adopting
When being installed with dynamic, fiber optic cables string is fixed by quick connector and the oxidant conveying equipment in coiled tubing unit, oxygen
Agent conveying equipment and optical fibre laser head are by external grapples connector or quick connector or with bayonet/positioning bolt spiral shell
Line or flange bolt, which are realized, connects and provides effective ground vapour close property sealing；When using static installation, fiber optic cables are ganged up too fast
Fast connector is directly connected and fixed to injection well bushing pipe/injection casing outside with optical fibre laser head.
3. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 1, which is characterized in that armouring
Fiber optic cables string includes that at least triple layer armoured protects sheath, and the armored fiber optic cable string outer diameter is 1/8-1 inches, each optical fiber electricity
Cable can provide the laser power of 2-10kW.
4. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 3, which is characterized in that described
The continuous pipe of certain wall thickness is installed to ensure the fiber optic cables string for high temperature and pressure pure oxygen environment on armored fiber optic cable string.
5. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 1, which is characterized in that described
Optical fibre laser head includes at least one reflector, laser lens and trapdoor, and wherein reflector is for shifting and adjusting laser
The direction of the launch, laser lens are used to adjust the diameter and area of laser beam, and trapdoor is used for defeated in optical-fiber laser ignition system
Optical fibre laser head is protected during sending.
6. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 1, which is characterized in that described
Optical fibre laser head guides carrier gas as the auxiliary of laser using air, oxygen-enriched air, oxygen, carbon dioxide or nitrogen, and guiding carries
The transfer passage of gas is coiled tubing inner passage, coiled tubing and injection well bushing pipe/injection casing annular space and injection
Well bushing pipe/injection casing and coal bed drilling annular space.
7. being used for the optical-fiber laser ignition system of coal underground gasifying technology according to claim 6, which is characterized in that described
Optical fibre laser head is additionally provided with rotating transmission device, and the optical fibre laser head can drive rotating transmission device by guidance carrier gas stream
Mechanical rotation is generated, which is adjusted so that part or whole optical fibre laser head carries out circular motion.
8. the operating method of optical-fiber laser ignition system described in claim 1, which is characterized in that based on having been set in subterranean coal
There is the completion system of ISC well pair, the operating method is as follows:
Ignition method under dynamic mounting means is as follows:
A. optical fibre laser head is advanced by predetermined ignition position by coiled tubing；
B. guiding carrier gas is injected by coiled tubing, and adjusts direction to the predetermined coal seam position of optical fibre laser head；
C. oxidant is injected by coiled tubing and injection well bushing pipe/injection casing annular space channel；
D. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
E. after lighting a fire successfully, recession equipment to home；
F. oxidant is injected by coiled tubing, implements underground coal gasification(UCG)；
G. pass through the above-mentioned a-f step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well owning for bushing pipe direction
Coal deposits.
Ignition method under static mounting means is as follows:
H. more a optical fibre laser heads have been mounted on predetermined coal seam ignition location；
I. it by the injection guiding carrier gas of the annular space channel of injection well bushing pipe/injection casing and coal bed drilling, and adjusts optical fiber and swashs
Direction to the predetermined coal seam position of shaven head；
J. oxidant is injected by injection well bushing pipe/injection casing inner passage；
K. by ground on-vehicle power initiation optical-fiber laser ignition system, implement subterranean coal igniting；
L. increase oxidant injection flow and pressure, implement underground coal gasification(UCG)；
M. pass through the above-mentioned h-l step of repetition and carry out secondary or multiple igniting, until consumption edge injects into well owning for bushing pipe direction
Coal deposits.
9. the operating method of optical-fiber laser ignition system described in claim 8, which is characterized in that based on having been set in subterranean coal
There is the completion system of ISC well pair, the operating method is as follows:
In the ignition method of the dynamic installation optical-fiber laser ignition system, the guiding using oxidant directly as laser is carried
Gas；
In the ignition method of the static installation optical-fiber laser ignition system, the guiding using nitrogen or carbon dioxide as laser
Carrier gas.
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| CN201811090784.6A CN109025950B (en) | 2018-09-18 | 2018-09-18 | Fiber laser ignition system for underground coal gasification process and operation method thereof |
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