CN110017124A - Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material - Google Patents
Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material Download PDFInfo
- Publication number
- CN110017124A CN110017124A CN201910162956.4A CN201910162956A CN110017124A CN 110017124 A CN110017124 A CN 110017124A CN 201910162956 A CN201910162956 A CN 201910162956A CN 110017124 A CN110017124 A CN 110017124A
- Authority
- CN
- China
- Prior art keywords
- gas
- phase
- coal seam
- coal
- storage material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The invention discloses a kind of coal-bed gas enhanced gas extraction method and its system based on phase-change heat-storage material, pumping method include drilling, establish extraction system, heating coal seam and exploitation four steps of gas；Extraction system includes storage silo and meter, and storage silo is connected with meter, and the conveying steel pipe for protruding into coal seam is connected on meter；It further include gas pipe network, gas pipe is connected with the gas drainage pipe for protruding into coal seam on the net；Storage silo is used to store phase-change heat-storage material, and meter is used to carry out traffic statistics and display to the phase-change heat-storage material of conveying, and temperature controlled situation is carried out quantization grasp.The invention has the advantages that being heated using phase-change heat-storage material heat release to coal seam, to be maintained at certain temperature range, the moisture evaporation inside coal seam is helped, the flow channel of gas is dredged, while also accelerating the flowing diffusion of gas, production efficiency is improved, the risk of exploitation is avoided.
Description
Technical field
The invention belongs to gas production technical field, in particular to a kind of coal-bed gas based on phase-change heat-storage material is strong
Change pumping method and extraction system.
Background technique
Coal is the main body energy in China, and the Gas Disaster with coal mining association is always to restrict Safety of Coal Mine Production
A great problem.With being continuously increased for mining depth and mining rate, fire damp outburst amount is increasing, gas overpressure frequency limit
Hair, Gas Outburst and gas explosion risk are got worse.Efficient draining coal seam gas is that the essence of prevention and treatment Gas Disaster is done
Method.
In terms of the anti-reflection reinforcing gas drainage in coal seam, common gas govenance mainly includes standing both at home and abroad
And hydraulic fracturing.Both the above can promote gas drainage to a certain extent, but generally existing coverage is small, function and effect
Limited problem is unable to satisfy coal production needs.Wherein, standing is also easy to that a large amount of gas is induced to discharge suddenly, causes
Gas secondary disaster；After hydraulic fracturing fracturing coal body, large quantity of moisture is remained in coal, thus can block Gas Flow channel, is stopped
Desorption of mash gas, seepage flow, diffusion, are unfavorable for gas drainage, and Gas Disaster is also difficult to be effectively prevented.Therefore, for existing watt
The deficiency of this extraction technology is badly in need of a kind of novel gas pumping method, greatly improves gas pumping effect, to meet coal mine peace
Full production needs.
The presence of substance has had been generally acknowledged that tri-state, and substance changes to another state phase transformation from a kind of state.Phase transformation
Form has following four: (1) solid-liquid phase change；(2) liquid-vapour phase becomes；(3) solid-vapour phase becomes；(4) solid-solid phase-change.Phase transition process
In with energy absorption or release, we can absorb and release phenomenon using have energy in phase transition process, utilize phase
Become material and carrys out storage energy.
There are many phase-changing energy storage materials, is such as applied by Shanghai University Of Engineering Science, Patent No.
ZL201510742887.6, entitled a kind of composite phase-change energy storage material and preparation method thereof provide for one of which, for another example
Applied by Shenyang Chemical Engineering Inst. Co., Ltd, Patent No. ZL201510259828.3, a kind of entitled improved silica
Shape-stabilized phase change energy storage and preparation method thereof provides one kind again.
Summary of the invention
In view of influencing in the prior art, coal seam range is small, function and effect are limited, secondary disaster and blocking Gas Flow are logical
The problem of road, the present invention provide a kind of coal-bed gas enhanced gas extraction method based on phase-change heat-storage material, technology to be solved
Problem increases the coverage to coal seam, and secondary disaster caused by avoiding gas from discharging suddenly avoids Gas-Flow in blocking coal seam
Dynamic channel, and then gas pumping effect is increased substantially, to meet Safety of Coal Mine Production needs.
An object of the present invention is to provide a kind of coal-bed gas enhanced gas extraction method based on phase-change heat-storage material, packet
Include following steps:
1) drill: a gas drainage hole of constructing in coal seam is constructed a coal again in the bottom end in the gas drainage hole
Layer preheating gate；
2) it establishes extraction system: being provided with the storage silo for storing phase-change heat-storage material outside the coal seam, the storage
Storehouse, which is connected, conveying steel pipe, and the conveying steel pipe is extend into inside the coal seam preheating gate, is additionally provided with gas outside the coal seam
Pipe network, the gas pipe are connected with gas drainage pipe on the net, which extend into gas drainage hole；Extraction system connects
After the completion of connecing, gas drainage hole is sealed with hole packer；
3) it heats coal seam: phase-change heat-storage material being inputted into coal seam preheating gate by storage silo and conveying steel pipe, utilizes phase
The temperature of change heat storage material is higher than the temperature in the coal seam to heat to the coal seam；
4) it exploits gas: keeping the connection of gas drainage pipe to gas pipe network unobstructed, gas in the coal seam passes through watt
This drainage holes is flowed into gas drainage pipe, and enters gas pipe network.
Gas pumping method provided in the present invention, basic principle are using phase-change heat-storage material, by the phase-change thermal storage
Material is circulated into coal seam, and since the temperature of the phase-changing energy storage material is higher, phase transformation can be generated by encountering the lower coal seam of temperature,
And heat is released, coal seam is heated.After coal seam absorbs heat, temperature is increased, and regional coal-seam temperature is controlled in a certain range
It is interior, the original moisture in coal seam is evaporated, gas migration channel has been discongested；In addition, gas molecular thermalmotion under thermogenic action
Enhance, it is free state gas that the ADSORPTION STATE gas in coal seam, which constantly desorbs, and desorption of mash gas diffusion rate is accelerated, and by coal
Crack flows to gas drainage hole, and fire damp pipe network is reached after gas drainage pipe, carries out gas drainage.
Further, the length in the gas drainage hole is 30m-50m.
Further, the diameter in the gas drainage hole is 110mm-140mm.
Further, the length of the coal seam preheating gate is 40m-60m.
Further, the diameter of the coal seam preheating gate is 25mm-55mm.
Further, the phase-change heat-storage material passes through meter during transportation and conveying capacity is measured and shown,
Power is provided to conveying by delivery pump, and controls flow, and then control the temperature in the coal seam.
Temperature in coal seam is controlled with realizing by the control to phase-change heat-storage material flow, temperature control is existed
In suitable range, it is conducive to evaporation water, dredges gas migration channel, while enhancing the warm-up movement of gas molecule.
Further, the temperature in temperature field is controlled at 55 DEG C -60 DEG C in the coal seam.
The second object of the present invention is to provide a kind of extraction that coal-bed gas enhanced gas extraction is carried out for phase-change heat-storage material
System, including storage silo and meter, the storage silo are connected with meter, and are connected on the meter and are protruded into coal seam
Conveying steel pipe；
It further include gas pipe network, the gas pipe is connected with the gas drainage pipe for protruding into coal seam on the net.
Storage silo is used to store phase-change heat-storage material, and meter is used to carry out flow system to the phase-change heat-storage material of conveying
Meter and display, carry out quantization grasp for temperature controlled situation.
Further, delivery pump is provided on the conveying steel pipe.
Further, valve is provided on the gas drainage pipe.
The utility model has the advantages that present inventive concept is novel, ingenious in design and structurally reasonable, using phase-change heat-storage material heat release to coal
Layer is heated, and to be maintained at certain temperature range, is helped the moisture evaporation inside coal seam, is dredged the flow channel of gas,
The flowing diffusion for also accelerating gas simultaneously, improves production efficiency, avoids the risk of exploitation.
Detailed description of the invention
Fig. 1 is positive structure diagram of the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples:
Embodiment one
A kind of coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as shown in Figure 1, it is characterised in that including
Following steps:
1) drill: a gas drainage hole 5 of constructing in coal seam 7, the length in gas drainage hole 5 are 30m-50m, gas
The diameter of drainage holes 5 is 110mm-140mm, is constructed again a coal seam preheating gate 11 in the bottom end in gas drainage hole 5, coal seam is pre-
The length of hot hole 11 is 40m-60m, and the diameter of coal seam preheating gate 11 is 25mm-55mm；
2) it establishes extraction system: being provided with the storage silo 1 for storing phase-change heat-storage material, the storage silo outside coal seam 7
1 connection has conveying steel pipe 6, and the conveying steel pipe 6 is extend into inside coal seam preheating gate 11, and gas pipe network is additionally provided with outside coal seam 7
10, gas drainage pipe 8 is connected on the gas pipe network 10, which extend into gas drainage hole 5；Extraction system
After the completion of connection, gas drainage hole 5 is sealed with hole packer 4；
3) it heats coal seam: phase-change heat-storage material is inputted into coal seam preheating gate 11 by storage silo 1 and conveying steel pipe 6, benefit
It is higher than the temperature in coal seam 7 with the temperature of phase-change heat-storage material to heat to the coal seam 7；
4) exploit gas: keeping gas drainage pipe 8 unobstructed to the connection of gas pipe network 10, gas in coal seam 7 by watt
This drainage holes 5 is flowed into gas drainage pipe 8, and enters gas pipe network 10.
In the specific implementation process, as a kind of perferred technical scheme, phase-change heat-storage material passes through during transportation
Meter 2 is measured and is shown to conveying capacity, provides power by 3 pairs of conveyings of delivery pump, and control flow, and then control
Temperature in coal seam 7.The temperature in temperature field is controlled at 55 DEG C -60 DEG C in coal seam 7.
In the specific implementation process, used phase-change heat-storage material is inorganic salts energy storage materials of phase change to the present embodiment, main
Wanting ingredient is stearic acid and titanium dioxide, other are conventional additives, wherein stearic accounting is 25%, is formed by nothing
Machine salt energy storage materials of phase change fusing point is 53.84 DEG C, latent heat of fusion 47.82kJ/kg, and freezing point is 53.31 DEG C, latent heat of solidification
For 46.60kJ/kg, there is good stability.
Basic principle in the present invention is that the phase-change heat-storage material is circulated into coal seam using phase-change heat-storage material, by
Higher in the temperature of the phase-changing energy storage material, phase transformation can be generated by encountering the lower coal seam of temperature, and release heat, to coal seam into
Row heating.After coal seam absorbs heat, temperature is increased, and regional coal-seam temperature controls in a certain range, makes the initial condition in coal seam
Divide evaporation, discongests gas migration channel.In addition, gas molecular thermalmotion under thermogenic action enhances, the ADSORPTION STATE in coal seam
It is free state gas that gas, which constantly desorbs, and desorption of mash gas diffusion rate is accelerated, and flows to gas drainage hole by crack in coal,
Reach fire damp pipe network after gas drainage pipe, realizes coal-bed gas enhanced gas extraction.
As shown in Figure 1, being specifically to bore gas drainage hole 5 in coal seam 7 to carry out the extraction of gas, at 5 bottom of gas drainage hole
Coal seam preheating gate 11 is bored in portion, and phase-change heat-storage material is circulated into the coal seam preheating gate 11 by conveying steel pipe 6, carries out coal
The preheating of layer.The coal seam being heated can volatilize methane gas, enter in the thicker gas drainage hole 5 of diameter, then pass through
Gas drainage pipe 8 carries out gas drainage, and the gas of extraction enters 10 the inside of gas pipe network, conveys outward.
Embodiment two
As shown in Figure 1, a kind of extraction system for carrying out coal-bed gas enhanced gas extraction for phase-change heat-storage material, has and deposits
Warehouse 1 and meter 2, storage silo 1 are connected with meter 2, and the conveying steel pipe 6 for protruding into coal seam 7 is connected on meter 2.Also
Including gas pipe network 10, the gas drainage pipe 8 for protruding into coal seam 7 is connected on gas pipe network 10.It is provided on conveying steel pipe 6 defeated
Send pump 3.Valve 9 is provided on gas drainage pipe 8.
In the present embodiment, storage silo 1 is used to change heat storage material of pretending, and meter 2 is used to show the phase transformation storage actually passed through
Hot material flow, conveying steel pipe 6 are used to convey phase-change heat-storage material, and gas pipe network 10 is used to the device in Gas of conveying exploitation outward
Body, gas drainage pipe 8 are used to mash gas extraction, and delivery pump 3 is used to provide power to the conveying of gas, and valve 9 is used as mash gas extraction
Switch.
The preferred embodiment of the present invention has been described in detail above.It should be appreciated that those skilled in the art without
It needs creative work according to the present invention can conceive and makes many modifications and variations.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical solution, all should be within the scope of protection determined by the claims.
Claims (10)
1. a kind of coal-bed gas enhanced gas extraction method based on phase-change heat-storage material, it is characterised in that include the following steps:
1) drill: a gas drainage hole (5) of constructing in coal seam (7) constructs one in the bottom end of the gas drainage hole (5) again
A coal seam preheating gate (11)；
2) it establishes extraction system: being provided with the storage silo (1) for storing phase-change heat-storage material outside the coal seam (7), this is deposited
Warehouse (1) connection has conveying steel pipe (6), and the conveying steel pipe (6) extend into coal seam preheating gate (11) inside, the coal seam
(7) gas pipe network (10) are additionally provided with outside, are connected with gas drainage pipe (8) on the gas pipe network (10), the gas drainage pipe (8)
It extend into gas drainage hole (5)；After the completion of extraction system connection, gas drainage hole (5) are sealed with hole packer (4)；
3) it heats coal seam: phase-change heat-storage material is inputted into coal seam preheating gate (11) by storage silo (1) and conveying steel pipe (6),
It is higher than the temperature of the coal seam (7) using the temperature of phase-change heat-storage material to heat to the coal seam (7)；
4) it exploits gas: keeping the connection of gas drainage pipe (8) to gas pipe network (10) unobstructed, the gas in the coal seam (7)
Gas drainage pipe (8) are flowed by gas drainage hole (5), and enter gas pipe network (10).
2. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as described in claim 1, it is characterised in that: in institute
It states in drill process, driller's length of the gas drainage hole (5) is 30m-50m.
3. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as claimed in claim 2, it is characterised in that: in institute
It states in drill process, driller's diameter of the gas drainage hole (5) is 110mm-140mm.
4. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as described in claim 1, it is characterised in that: in institute
It states in drill process, driller's length of the coal seam preheating gate (11) is 40m-60m.
5. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as claimed in claim 4, it is characterised in that: in institute
It states in drill process, driller's diameter of the coal seam preheating gate (11) is 25mm-55mm.
6. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as described in claim 1, it is characterised in that: in coal
In layer heating steps, the phase-change heat-storage material passes through meter (2) during transportation and conveying capacity is measured and shown,
Power is provided to conveying by delivery pump (3), and controls flow, and then control the temperature in the coal seam (7).
7. the coal-bed gas enhanced gas extraction method based on phase-change heat-storage material as claimed in claim 6, it is characterised in that: described
The temperature in coal seam (7) interior temperature field is controlled at 55 DEG C -60 DEG C.
8. a kind of extraction system for carrying out coal-bed gas enhanced gas extraction for phase-change heat-storage material, it is characterised in that: including storage
Storehouse (1) and meter (2), the storage silo (1) is connected with meter (2), and is connected on the meter (2) and is protruded into coal seam
(7) conveying steel pipe (6)；
Further include gas pipe network (10), the gas drainage pipe (8) for protruding into coal seam (7) is connected on the gas pipe network (10).
9. a kind of extraction system that coal-bed gas enhanced gas extraction is carried out for phase-change heat-storage material as claimed in claim 8,
It is characterized in that: being provided with delivery pump (3) on the conveying steel pipe (6).
10. a kind of extraction system that coal-bed gas enhanced gas extraction is carried out for phase-change heat-storage material as claimed in claim 9,
It is characterized in that: being provided with valve (9) on the gas drainage pipe (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162956.4A CN110017124A (en) | 2019-03-05 | 2019-03-05 | Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910162956.4A CN110017124A (en) | 2019-03-05 | 2019-03-05 | Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110017124A true CN110017124A (en) | 2019-07-16 |
Family
ID=67189295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910162956.4A Pending CN110017124A (en) | 2019-03-05 | 2019-03-05 | Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110017124A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105201481A (en) * | 2015-10-17 | 2015-12-30 | 山西晋煤集团技术研究院有限责任公司 | Liquid CO2 phase transition multipoint fracturing and permeability increasing method |
| CN205593878U (en) * | 2016-05-09 | 2016-09-21 | 华北科技学院 | Coal body heating methane desorption experimental apparatus |
| US20170137704A1 (en) * | 2013-08-19 | 2017-05-18 | Baker Hughes Incorporated | Apparatus and Methods for Stimulating Reservoirs Using Fluids Containing Nano/Micro Heat Transfer Elements |
| CN106894799A (en) * | 2017-04-26 | 2017-06-27 | 华北科技学院 | A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas |
| CN106948816A (en) * | 2017-03-21 | 2017-07-14 | 太原理工大学 | Automatic energy storage high pressure fluid injection CO2Phase conversion pulse coal and rock fracturing method |
-
2019
- 2019-03-05 CN CN201910162956.4A patent/CN110017124A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170137704A1 (en) * | 2013-08-19 | 2017-05-18 | Baker Hughes Incorporated | Apparatus and Methods for Stimulating Reservoirs Using Fluids Containing Nano/Micro Heat Transfer Elements |
| CN105201481A (en) * | 2015-10-17 | 2015-12-30 | 山西晋煤集团技术研究院有限责任公司 | Liquid CO2 phase transition multipoint fracturing and permeability increasing method |
| CN205593878U (en) * | 2016-05-09 | 2016-09-21 | 华北科技学院 | Coal body heating methane desorption experimental apparatus |
| CN106948816A (en) * | 2017-03-21 | 2017-07-14 | 太原理工大学 | Automatic energy storage high pressure fluid injection CO2Phase conversion pulse coal and rock fracturing method |
| CN106894799A (en) * | 2017-04-26 | 2017-06-27 | 华北科技学院 | A kind of device and method of utilization supercritical carbon dioxide displacement coal-bed gas |
Non-Patent Citations (4)
| Title |
|---|
| 《能源百科全书》编辑委员会: "《能源百科全书》", 31 January 1997, 中国大百科全书出版社 * |
| 刘文革: "《煤矿瓦斯防治管理和技术》", 30 June 2017, 煤炭工业出版社 * |
| 杨涛 等: "煤层钻孔升温提高瓦斯抽放效率的新思路", 《煤炭技术》 * |
| 王立久 等: "《新型屋面材料》", 31 October 2012, 中国建材工业出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109723488A (en) | Utilize the gas pumping method and extraction system of phase-change material auxiliary liquid nitrogen fracturing | |
| CN105134284B (en) | One kind is based on horizontal orientation drilling liquid nitrogen circulating freezing resistance anti-reflection mash gas extraction method | |
| WO2020077967A1 (en) | Multilevel deep well cooling and geothermal utilization system and process | |
| CN106285605A (en) | A kind of microwave liquid nitrogen works in coordination with freeze thawing coal seam anti-reflection method | |
| CN101539335B (en) | Solar energy underground cross-season heat-storing method | |
| CN101776209B (en) | Antifreezing and anti-blocking method of natural gas runner | |
| CN105298459B (en) | A kind of microwave heating release method of ground coal bed gas extraction drilling well coal seam Water-blocking damage | |
| CN107763712B (en) | Individual well underground heat combined solar heating system | |
| CN206478882U (en) | A kind of U-shaped well deep geothermal heat conduction-convection problem | |
| CN104632271A (en) | Method for increasing permeability in drilling holes in cold expansion and heat driving mode | |
| CN109854210A (en) | Using the gas pumping method and extraction system of liquid nitrogen and steam fracturing coal seam | |
| CN112412415B (en) | Hydraulic punching, freezing fracturing and heat injection stimulation synergistic permeability-increasing pumping-promoting method | |
| CN108756839A (en) | The heat-insulated synergy converted in-situ method and system of oil shale | |
| CN104492004A (en) | Method for preventing coal waste piles from spontaneous combustion | |
| CN206220990U (en) | Deep well temperature reduction system based on packaging phase change material micro unit | |
| CN106968705A (en) | A kind of hot cold punching of drainage from coal seam drilling breaks up coal permeability improvement device and anti-reflection method | |
| CN107782004B (en) | A kind of method that geothermal energy extracts raising gas drainage rate | |
| CN108106507A (en) | A kind of tunnel top blasthole plugging device | |
| CN112268474A (en) | Geothermal energy extraction device and extraction method | |
| CN110017124A (en) | Coal-bed gas enhanced gas extraction method and extraction system based on phase-change heat-storage material | |
| CN202092372U (en) | Buried tube heat exchanger of small-sized ground source heat pump system | |
| CN109931036A (en) | The method that underground heat and oil gas are adopted altogether in petroleum or natural gas extraction | |
| CN109539612A (en) | A kind of buried pipe heat exchange system for capableing of annual operation | |
| CN106948798A (en) | A kind of oil well open type heat tracing circulation system and its operation method | |
| CN201093792Y (en) | Freezing system of underground engineering tunnel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190716 |