CN104088588B - A kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure - Google Patents
A kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure Download PDFInfo
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- CN104088588B CN104088588B CN201410289232.3A CN201410289232A CN104088588B CN 104088588 B CN104088588 B CN 104088588B CN 201410289232 A CN201410289232 A CN 201410289232A CN 104088588 B CN104088588 B CN 104088588B
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Abstract
The present invention discloses a kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure, it relates to coal underground gasification technology field, for avoiding the invalid leakage in the stratum of vaporized chemical, is beneficial to the operation of sleeve pipe and invents. Underground coal gasification sleeve pipe comprises sleeve pipe and running casing, the cooperation of described cased upper end is arranged in the lower end of described upper sleeve pipe, and described running casing can be free to slide along described upper internal surface of sleeve pipe, the lower end of described cased upper end and described upper sleeve pipe is funnel-shaped structure, and described cased upper end funnel-shaped structure can be carried out spacing by the lower end funnel-shaped structure of described upper sleeve pipe, thus the lower end stoping described cased upper end and described upper sleeve pipe departs from. Underground coal gasification sleeve pipe of the present invention is used for underground coal gasification inlet, outlet pore structure.
Description
Technical field
The present invention relates to coal underground gasification technology field, particularly relate to a kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure.
Background technology
Along with the development of coal underground gasification technology, the application of organic matter gasification unit in coal underground gasification technology field is more and more wider, minimum entity organic matter gasification unit is by air inlet port, production well and gasification channel composition, wherein vaporized chemical is transported in organic matter by air inlet port, and the organic matter with high temperature is oxidized, the reaction such as reduction and pyrolysis, the coal gas produced derives ground by production well after gasification channel, carry out further utilization again, and along with the reaction of vaporized chemical and organic matter, the cavity that air inlet nose end is formed can be increasing, the temperature of production well can be more and more higher, when boring, in bottom inbreak or sleeve pipe generation is flexible when temperature is raised, the fixed sturcture in waterbearing stratum, top can be destroyed, and make the water in waterbearing stratum, top and gasification coal seam conducting, affect normally carrying out of underground coal gasification process.
By adopting cementing concrete by borehole casing outer wall and around shut between rock stratum in prior art, and the borehole casing structure of prior art is single, do not occur straggly on stratum, or borehole casing due to temperature variation little, when not causing telescopic extension, the water in waterbearing stratum, top can not be made to import in gasification coal seam, and then affect normally carrying out of underground coal gasification process.
But there are following two aspect problems in the sleeve pipe of prior art:
First, during upper and lower cannula connection employing ordinary construction, owing to running casing and stratum are not fixed, before boring uses, the rock stratum that may there is surrounding is not squeezed dead with running casing completely, when using when holing, especially during high pressure fracture, it is easy to from the stratum of the downward its vicinity of connecting portion of upper and lower section of sleeve pipe and leaks gas, the wastage of vaporized chemical in through process can be increased like this.
2nd, when boring is for going out gas drilling hole, gas of giving vent to anger can be entrained with the gentle state of tiny lime-ash and liquid water one piece discharges boring, along with the growth of the time of giving vent to anger, these tiny lime-ash will with the boss place of water mixed deposit to connecting portion, by the high temperature action of gas of giving vent to anger, these settlings will become very hard, thus stop the upwards expansion of hypomere sleeve pipe, affect the operation of sleeve pipe.
Summary of the invention
Embodiments of the invention provide a kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure, it is possible to avoid the invalid leakage in the stratum of vaporized chemical, be conducive to again the operation of sleeve pipe. For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of underground coal gasification sleeve pipe, comprise sleeve pipe and running casing, the cooperation of described cased upper end is arranged in the lower end of described upper sleeve pipe, and described running casing can be free to slide along described upper internal surface of sleeve pipe, the lower end of described cased upper end and described upper sleeve pipe is funnel-shaped structure, and described cased upper end funnel-shaped structure can be carried out spacing by the lower end funnel-shaped structure of described upper sleeve pipe, thus the lower end stoping described cased upper end and described upper sleeve pipe departs from.
Further, the angle of inclination of the lower end side wall of described upper sleeve pipe is consistent with the angle of inclination of described cased upper end sidewall.
Further, the angle of inclination of the lower end side wall of described upper sleeve pipe and the angle of inclination of described cased upper end sidewall are 3 �㡫5 ��.
Further, the angle of inclination of the lower end side wall of described upper sleeve pipe and the angle of inclination of described cased upper end sidewall are 4 ��.
The present invention on the other hand embodiment still provides a kind of underground coal gasification inlet, outlet pore structure, comprise be opened in ground and with wait the open holes that is connected of coal seam that gasifies, described open holes comprises the upper sleeve pipe open holes and running casing open holes that communicate with each other, described upper sleeve pipe open holes is arranged in the waterbearing stratum on gasification top, coal seam through treating, also comprise as above underground coal gasification sleeve pipe described in any technology scheme, described upper sleeve pipe is fixedly installed in described upper sleeve pipe open holes, and described running casing is freely arranged in described running casing open holes.
Further, described upper sleeve pipe is connected with described upper sleeve pipe open holes by cementing concrete ring.
Further, the lower surface of described upper sleeve pipe is positioned at distance and waits to gasify below nearest waterbearing stratum, coal seam.
Further, the lower surface of described upper sleeve pipe and the distance in described waterbearing stratum are greater than 5 meters.
Further, the distance of gasification coal seam end face is greater than 5 times that treat gasification of coal layer thickness to the lower surface of described upper sleeve pipe with treating.
Further, the lower surface of described upper sleeve pipe and the distance in described waterbearing stratum are 10 meters, described in treat that gasification of coal layer thickness is 6 meters, the lower surface of described upper sleeve pipe is 40 meters with the distance of the coal seam end face of waiting to gasify.
The underground coal gasification sleeve pipe that the embodiment of the present invention provides and underground coal gasification are entered, air outlet hole structure, owing to running casing can be free to slide along upper internal surface of sleeve pipe, the lower end of cased upper end and upper sleeve pipe is funnel-shaped structure, cased upper end funnel-shaped structure can be carried out spacing by the lower end funnel-shaped structure of upper sleeve pipe, thus the lower end preventing cased upper end and upper sleeve pipe departs from, again owing to the rock stratum in running casing and its surrounding formation structure is not fixed, the rock stratum that may there is surrounding is not squeezed dead with running casing completely, when sleeve pipe is used for production well, especially during high pressure fracture, it is easy to from upper, the rock stratum of the downward its vicinity of cased connecting portion leaks gas, the wastage of vaporized chemical in through process can be increased like this, and after cased upper end all adopts funnel-shaped structure to be connected with the lower end of upper sleeve pipe, on, cased connecting portion contact area will be very big, vaporized chemical can be avoided from upper, cased junction is missed to rock stratum around, therefore, when passing in and out gas drilling hole and be used for high pressure fracture, the sleeve pipe that more suitable employing this kind of funnel-shaped structure connects.Again due to when sleeve pipe is used for production well, gas of giving vent to anger can be entrained with the gentle state of tiny lime-ash and liquid water one piece discharges production well, along with the growth of the time of giving vent to anger, these tiny lime-ash will with water mixed deposit to upper, cased connecting portion, by the high temperature action of gas of giving vent to anger, these settlings will become very hard, thus stop running casing upwards to expand, the impact making running casing that upper sleeve pipe produce external force increases, and then the possibility making sleeve pipe destroy in the air hole structure in waterbearing stratum, top and the water importing stove in waterbearing stratum, top increases, it is difficult to ensure normally carrying out of underground coal gasification process, and after the lower end of cased upper end and upper sleeve pipe adopts funnel-shaped structure to be connected, on, running casing connecting portion transitions smooth, almost can not form the settling affecting running casing and upwards expanding, therefore, on, running casing is conducive to the operation of sleeve pipe after adopting funnel-shaped structure to connect, especially when sleeve pipe is used for production well to the operation of sleeve pipe advantageously.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, it is briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of embodiment of the present invention underground coal gasification sleeve pipe;
Fig. 2 is the wiring layout of embodiment of the present invention underground coal gasification inlet, outlet pore structure and stratal configuration.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present invention underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure are described in detail.
In describing the invention, it will be appreciated that, it is based on orientation shown in the drawings or position relation that the orientation of the instruction such as term " " center ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end ", " interior ", " outward " or position are closed; be only the present invention for convenience of description and simplified characterization; instead of the device that refers to of instruction or hint or element must have specific orientation, with specific orientation structure and operation, therefore can not be interpreted as limitation of the present invention.
Term " first ", " the 2nd " are only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technology feature. Thus, be limited with " first ", the feature of " the 2nd " can express or implicit comprise one or more these features. In describing the invention, unless otherwise explanation, the implication of " multiple " is two or more.
In describing the invention, it is necessary to explanation, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, such as, it is possible to be fixedly connected with, it is also possible to be removably connect, or connect integratedly; Can be directly be connected, it is also possible to be indirectly connected by intermediary, it is possible to be the connection of two element internals. For the ordinary skill in the art, it is possible to particular case understands above-mentioned term concrete implication in the present invention.
Fig. 1 is a specific embodiment of embodiment of the present invention underground coal gasification sleeve pipe, underground coal gasification sleeve pipe in the present embodiment, comprise sleeve pipe 1 and running casing 2, the upper end cooperation of described running casing 2 is arranged in the lower end of described upper sleeve pipe 1, and described running casing 2 can be free to slide along described upper sleeve pipe 1 inwall, the upper end of described running casing 2 and the lower end of described upper sleeve pipe 1 are funnel-shaped structure, and the upper end funnel-shaped structure of described running casing 2 can be carried out spacing by the lower end funnel-shaped structure of described upper sleeve pipe 1, thus stop the upper end of described running casing 2 and the lower end of described upper sleeve pipe 1 to depart from.
The underground coal gasification sleeve pipe that the embodiment of the present invention provides, the upper end of running casing 2 and the lower end of upper sleeve pipe 1 are funnel-shaped structure, the upper end funnel-shaped structure of running casing 2 can be carried out spacing by the lower end funnel-shaped structure of upper sleeve pipe 1, thus stops the upper end of running casing 2 and the lower end of upper sleeve pipe 1 to depart from. owing to running casing 2 and the rock stratum in its surrounding formation structure are not fixed, the rock stratum that may there is surrounding is not squeezed dead with running casing 2 completely, when sleeve pipe is used for production well, especially during high pressure fracture, it is easy to from upper, cased connecting portion leaks gas in the rock stratum around running casing 2, the wastage of vaporized chemical in through process can be increased like this, it is connected if the upper end of running casing 2 is funnel-shaped structure with the lower end of upper sleeve pipe 1, so go up, cased connecting portion contact area will be very big, vaporized chemical can be avoided from upper, cased junction is missed to rock stratum around, therefore, when passing in and out gas drilling hole and be used for high pressure fracture, the sleeve pipe that more suitable employing this kind of funnel-shaped structure connects.
In above-described embodiment, as depicted in figs. 1 and 2, for ensureing that upper and lower sleeve pipe better hangs connection, need the angle of inclination of lower end side wall of upper sleeve pipe 1 consistent with the angle of inclination design of the upper end sidewall of running casing 2, form funnel-shaped structure, upper and lower sleeve pipe can be hung and connect by this kind of funnel-shaped structure, namely the upper end of running casing 2 and the lower end of upper sleeve pipe 1 can be stoped to depart from, make again the connecting portion contact area of upper and lower sleeve pipe increase, it is possible to avoid vaporized chemical from the junction of upper and lower sleeve pipe below waterbearing stratum rock stratum 32 miss.
In above-described embodiment, also need to consider the angle of inclination of lower end side wall of upper sleeve pipe 1 and the angle of inclination of the upper end sidewall of running casing 2 are all designed to 3 �㡫5 ��, the angle of inclination of 3 �㡫5 �� all can ensure that the lower end of upper sleeve pipe 1 and the upper end of running casing 2 form funnel-shaped structure, and make upper and lower sleeve pipe 2 better hang connection, the connecting portion contact area of upper and lower sleeve pipe is increased, avoid vaporized chemical from the junction of upper and lower sleeve pipe below waterbearing stratum rock stratum 32 miss.
As preferably, the angle of inclination at the angle of inclination of the lower end side wall of upper sleeve pipe 1 and the upper end sidewall of running casing 2 is all designed to 4 ��, the angle of inclination at the angle of inclination of the lower end side wall of upper sleeve pipe 1 and the upper end sidewall of running casing 2 is all designed to 4 ��, can ensure that the lower end of upper sleeve pipe 1 and the upper end of running casing 2 form funnel-shaped structure, and making upper and lower sleeve pipe 2 hang, to connect effect best, maximum degree avoid vaporized chemical from the junction of upper and lower sleeve pipe below waterbearing stratum rock stratum 32 miss.
The present invention's a kind of underground coal gasification that embodiment still provides on the other hand is entered, air outlet hole structure, comprise the upper sleeve pipe open holes and running casing open holes that are located along the same line and communicate with each other, also comprise the underground coal gasification sleeve pipe described in above-mentioned any embodiment, described upper sleeve pipe 1 is fixedly installed in described upper sleeve pipe open holes, described running casing 2 is freely arranged in described running casing open holes, as shown in Figure 2, due to when sleeve pipe is used for production well, gas of giving vent to anger can be entrained with the gentle state of tiny lime-ash and liquid water one piece discharges production well, along with the growth of the time of giving vent to anger, these tiny lime-ash will with water mixed deposit to upper, cased connecting portion, by the high temperature action of gas of giving vent to anger, these settlings will become very hard, thus stop the upwards expansion of running casing 2, the impact making running casing 2 that upper sleeve pipe 1 produce external force increases, and then it is bigger to make sleeve pipe 1 destroy the possibility in the air hole structure in waterbearing stratum, top 4 and the water importing stove in waterbearing stratum, top 4, it is difficult to ensure normally carrying out of underground coal gasification process, and after the lower end of the upper end of running casing 2 and upper sleeve pipe 1 adopts funnel-shaped structure to be connected, on, running casing connecting portion transitions smooth, almost can not form the settling affecting running casing 2 and upwards expanding, thus be conducive to the operation of sleeve pipe, especially to production well advantageously.
Underground coal gasification sleeve pipe owing to using in the underground coal gasification inlet, outlet pore structure of the present embodiment is identical with the underground coal gasification sleeve pipe provided in each embodiment of above-mentioned underground coal gasification sleeve pipe, therefore the two can solve identical technical problem, and reaches identical desired result.
Concrete, as shown in Figure 2, upper sleeve pipe 1 is connected with upper sleeve pipe open holes by cementing concrete ring 5, owing to lower part and the waterbearing stratum 4 of upper sleeve pipe 1 are nearer, this part is also need fixing key position, the upper end of running casing 2 all adopts funnel-shaped structure to be connected with the lower end of upper sleeve pipe 1, upper sleeve pipe 1 is the closer to bottom, the annular clearance of itself and above rock stratum, waterbearing stratum 31 is more big, namely the sleeve pipe at the position easily leading water and the annular clearance of rock stratum is increased, when need not strengthen creep into open-hole diameter, the thickness of the cementing concrete ring 5 of position, easy water guide sector is increased, the weak part of sleeve pipe open holes is served better provide protection, and then the water preventing waterbearing stratum 4 imports in stove.
For underground coal gasification process under guaranteeing Different Strata structure all normally carries out, need the Position Design considering upper sleeve pipe 1, the distance in the Position Design of upper sleeve pipe 1 and the lower surface of upper sleeve pipe 1 and waterbearing stratum 4, the lower surface of upper sleeve pipe 1 is with treating the distance of gasification coal seam 6 end face and treats that the thickness in gasification coal seam 6 has relation, owing to lower end and its waterbearing stratum above rock stratum 31 place of upper sleeve pipe 1 is the position the most easily leading water, also it is the part that Kongzui weakness installed by upper sleeve pipe, the lower surface design of upper sleeve pipe 1 can be treated, in distance, the waterbearing stratum less than 4 that gasification coal seam 6 is nearest, and the distance in the lower surface of upper sleeve pipe 1 and waterbearing stratum 4 is designed to be greater than 5 meters, distance can be reduced and treat that the water in the waterbearing stratum 4 that gasification coal seam 6 is nearest enters the possibility treating gasification coal seam 6, fall behind that upper and lower sleeve pipe is damaged, makes cementing concrete ring loose or dislocation by the terrestrial stress that produces, the water in waterbearing stratum 4 enters the possibility treating gasification coal seam 6 for reducing to emit due to roof simultaneously, due to waterbearing stratum 4 and wait that the stratum gasified between coal seam 6 is too thin, along with the carrying out treating gasification coal seam 6 gasification, this stratum loses support, there is inbreak, the terrestrial stress produced can to upper, running casing damages, thus break sleeve pipe, the water in waterbearing stratum 4 is made to enter in stove, therefore, need to consider that the distance of gasification coal seam 6 end face designs larger with treating by the lower surface of upper sleeve pipe 1, facts have proved, it is designed to the distance of the lower surface of upper sleeve pipe 1 with coal seam 6 end face of waiting to gasify to be greater than and waits to gasify 5 times of coal seam 6 thickness, waterbearing stratum 4 can be avoided and wait that inbreak occurs on the stratum gasified between coal seam 6, guarantee to treat normally carrying out of gasification coal seam 6 gasification.
Such as above-described embodiment, owing to lower end and its waterbearing stratum above rock stratum 31 place of upper sleeve pipe 1 is the position the most easily leading water, also it is the part that Kongzui weakness installed by upper sleeve pipe, the lower surface design of upper sleeve pipe 1 can be treated, in distance, the waterbearing stratum less than 4 that gasification coal seam 6 is nearest, and the distance of the lower surface of upper sleeve pipe 1 and waterbearing stratum 4 is designed to 10 meters, again upper sleeve pipe 1 is all connected with upper sleeve pipe open holes by cementing concrete ring 5, can ensure that waterbearing stratum 4 is by fixing dead, distance is treated, and the water in the waterbearing stratum 4 that gasification coal seam 6 is nearest enters the possibility waiting to gasify coal seam 6 and becomes less, meanwhile, by the lower surface of upper sleeve pipe 1, the distance of gasification coal seam 6 end face is designed to 40 meters with treating, it is possible to makes waterbearing stratum 4 and waits that the stratum gasified between coal seam 6 occurs the possibility of inbreak also to become less, it is ensured that treats normally carrying out of gasification coal seam 6 gasification.
Other formations about the underground coal gasification inlet, outlet pore structure of the embodiment of the present invention wait known by the technician of this area, illustrate no longer in detail at this.
In the description of this specification sheets, concrete feature, structure, material or feature can combine in an appropriate manner in any one or more embodiment or example.
The above; it is only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any it is familiar with those skilled in the art in the technical scope that the present invention discloses; change can be expected easily or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.
Claims (10)
1. a underground coal gasification sleeve pipe, it is characterized in that, comprise sleeve pipe and running casing, the cooperation of described cased upper end is arranged in the lower end of described upper sleeve pipe, and described running casing can be free to slide along described upper internal surface of sleeve pipe, the lower end of described cased upper end and described upper sleeve pipe is funnel-shaped structure, and described cased upper end funnel-shaped structure can be carried out spacing by the lower end funnel-shaped structure of described upper sleeve pipe, thus the lower end stoping described cased upper end and described upper sleeve pipe departs from.
2. underground coal gasification sleeve pipe according to claim 1, it is characterised in that, the angle of inclination of the lower end side wall of described upper sleeve pipe is consistent with the angle of inclination of described cased upper end sidewall.
3. underground coal gasification sleeve pipe according to claim 2, it is characterised in that, the angle of inclination of the lower end side wall of described upper sleeve pipe and the angle of inclination of described cased upper end sidewall are 3 �㡫5 ��.
4. underground coal gasification sleeve pipe according to claim 3, it is characterised in that, the angle of inclination of the lower end side wall of described upper sleeve pipe and the angle of inclination of described cased upper end sidewall are 4 ��.
5. a underground coal gasification inlet, outlet pore structure, comprise be opened in ground and with wait the open holes that is connected of coal seam that gasifies, described open holes comprises the upper sleeve pipe open holes and running casing open holes that communicate with each other, described upper sleeve pipe open holes is arranged in the waterbearing stratum on gasification top, coal seam through treating, it is characterized in that, also comprising the sleeve pipe according to any one of Claims 1 to 4, described upper sleeve pipe is fixedly installed in described upper sleeve pipe open holes, and described running casing is freely arranged in described running casing open holes.
6. underground coal gasification inlet, outlet pore structure according to claim 5, it is characterised in that, described upper sleeve pipe is connected with described upper sleeve pipe open holes by cementing concrete ring.
7. underground coal gasification inlet, outlet pore structure according to claim 5, it is characterised in that, the lower surface of described upper sleeve pipe is positioned at distance and treats below the waterbearing stratum that gasification coal seam is nearest.
8. underground coal gasification inlet, outlet pore structure according to claim 7, it is characterised in that, the lower surface of described upper sleeve pipe and the distance in described waterbearing stratum are greater than 5 meters.
9. underground coal gasification inlet, outlet pore structure according to claim 5, it is characterised in that, the distance of gasification coal seam end face is greater than 5 times that treat gasification of coal layer thickness to the lower surface of described upper sleeve pipe with treating.
10. underground coal gasification inlet, outlet pore structure according to any one of claim 7��9, it is characterized in that, the lower surface of described upper sleeve pipe and the distance in described waterbearing stratum are 10 meters, described treating that gasification of coal layer thickness is 6 meters, the lower surface of described upper sleeve pipe is 40 meters with the distance of coal seam end face of waiting to gasify.
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| CN201410289232.3A CN104088588B (en) | 2014-06-24 | 2014-06-24 | A kind of underground coal gasification sleeve pipe and underground coal gasification inlet, outlet pore structure |
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| CN104747159B (en) * | 2015-02-03 | 2018-05-25 | 新奥科技发展有限公司 | Well construction water leak-proof method and casing |
| CN107461187B (en) * | 2017-08-28 | 2023-03-17 | 新疆国利衡清洁能源科技有限公司 | Coal underground gasification air outlet hole device and air outlet drill hole |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1062330C (en) * | 1995-05-25 | 2001-02-21 | 中国矿业大学 | Propulsion air-feeding type coal underground gasifying furnace |
| CN1190587C (en) * | 2001-06-18 | 2005-02-23 | 新汶矿业集团有限责任公司孙村煤矿 | Compensation method for expanding with heat and contracting with cold of underground gasifying furnace perforated pipe |
| CN100526600C (en) * | 2006-08-18 | 2009-08-12 | 辽河石油勘探局 | Well casing protecting equipment for deep coal underground gasification production well |
| WO2009157811A1 (en) * | 2008-06-26 | 2009-12-30 | Открытое Акционерное Общество "Газпром Промгаз" | Coal gasification method (variants) and a subsurface water purification method |
| CN102465693A (en) * | 2010-10-29 | 2012-05-23 | 乌兰察布新奥气化采煤技术有限公司 | Underground coal gasification bored well body structure and construction method thereof |
| CN102287177A (en) * | 2011-08-19 | 2011-12-21 | 秦勇 | Method for gasifying underground coal |
| CN103742122B (en) * | 2014-01-28 | 2017-09-19 | 新奥科技发展有限公司 | Underground coal gasification system and gasification process |
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Effective date of registration: 20170214 Address after: 065001 Hebei economic and Technological Development Zone, Langfang science and Technology Park in the Southern District of B building, room 522 Patentee after: ENN SCIENCE & TECHNOLOGY DEVELOPMENT Co.,Ltd. Address before: The 065001 Hebei economic and Technological Development Zone of Langfang Huaxiang new Austrian Science and Technology Park in the Southern District B building room 522 Patentee before: ENN Coal Gasification Co., Ltd. |