CN108331609B - Bedding drilling, slotting, pressure relief and permeability increasing method - Google Patents
Bedding drilling, slotting, pressure relief and permeability increasing method Download PDFInfo
- Publication number
- CN108331609B CN108331609B CN201810060728.1A CN201810060728A CN108331609B CN 108331609 B CN108331609 B CN 108331609B CN 201810060728 A CN201810060728 A CN 201810060728A CN 108331609 B CN108331609 B CN 108331609B
- Authority
- CN
- China
- Prior art keywords
- slot
- drilling
- concordant
- pressure
- discoid
- 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.)
- Active
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 13
- 230000035699 permeability Effects 0.000 title abstract description 4
- 239000003245 coal Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- ZZUFCTLCJUWOSV-UHFFFAOYSA-N furosemide Chemical group C1=C(Cl)C(S(=O)(=O)N)=CC(C(O)=O)=C1NCC1=CC=CO1 ZZUFCTLCJUWOSV-UHFFFAOYSA-N 0.000 claims description 25
- 238000001028 reflection method Methods 0.000 claims description 15
- 241001074085 Scophthalmus aquosus Species 0.000 claims description 12
- 238000005086 pumping Methods 0.000 claims description 9
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 abstract description 5
- 238000005065 mining Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 239000010410 layer Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a bedding drilling, slotting, pressure relief and permeability improvement method, which comprises the following steps: (1) constructing a bedding gas extraction borehole by using a high-pressure hydraulic slotting device according to the design requirement of the bedding gas extraction borehole to form a borehole; (2) without withdrawing the drill, introducing high-pressure water into the high-pressure hydraulic seam cutting device to perform rotary annular cutting on the coal body to form a disc-shaped seam groove; (3) after the disc-shaped slot is formed, the drill bit is withdrawn, and the drill bit and the drill rod do not rotate, so that the coal body is radially cut to form a radial slot; (4) repeating the step (2) and the step (3), and forming a plurality of disc-shaped slits and radial slits in the same drilling hole; (5) and (4) repeating the steps (1) to (4), and respectively performing drilling and slotting operation on other bedding drill holes. The invention reduces the stress of the coal bed in the horizontal and vertical directions, improves the extraction concentration and flow of the gas in the drill hole, reduces the number of bedding drill holes on the working face, and has simple method and convenient operation.
Description
Technical field
The present invention relates to coal mine gas drainage technical field, in particular to a kind of concordant drilling slot release anti-reflection method.
Background technique
Deep mining coal and gas prominent, bump are a kind of very serious and commonplace threat safety of coal mines
The natural calamity of production.According to incompletely statistics, there are gas dynamical disaster in a countries and regions about more than 20 at present, occur
The total degree of disaster is in 5 Wan Duoci, and dead more than 35000 people, wherein bump accident also increases year by year.With mining depth
Increase, coal-bed gas pressure, gas bearing capacity, crustal stress increase, and the outburst hazard of projecting mine is increasingly severe, becomes threat
Mining area safety produces one of main problem；In addition to this, deep increase, the increase of mine pressure are adopted can also bring bump and
The problems such as deep-well underground heat.
In the case where Deep Mine high intensity opens up mining conditions, the dynamic disasters such as coal and gas prominent, bump may be total to
It is stored in same mine or coal seam different zones.To improve Gas pre-drainage effect and reducing high-ground stress, concordant drilling takes brill
It draws cave, deep-hole control presplit blasting, deep hole standing shot, high-pressure water jet reaming, hydraulic slotted liner technique, hydraulic fracturing and compound arranges in hole
It is anti-reflection to apply reinforcing release.Though these measures obtain certain effect to low-permeable high gas layer extraction rate is improved；But there are bright
Aobvious limitation, the accidents such as some mines induce protrusion after taking anti-reflection measure, tunnel is collapsed, less effective；It furthermore cannot be to coal
The continuous release of layer progress is anti-reflection, can not fundamentally guarantee the safe and efficient production of stope.
Summary of the invention
The slot release anti-reflection method in view of this, a kind of concordant of the invention drills, overcomes the deficiency in prior art,
Provide the continuous slotting process that a kind of circumferential and radial hydraulic slotted liner technique combines, realize the entirety release of coal working face coal seam and
It is anti-reflection, reduce working face concordant mash gas pumping drilling quantity, reduce that coal seam is vertical, stress level of horizontal direction, ensures
Working face safe and efficient back production.
Concordant drilling slot release anti-reflection method of the invention, comprising the following steps:
(1) according to concordant mash gas pumping drilling design requirement, high-pressure hydraulic slotting device construction concordant gas drainage is utilized
Drilling forms drilling；
(2) brill is not moved back, high pressure water is passed through in high-pressure hydraulic slotting device, coal body rotate circumferential cutting and formed justifying
Plate-like slot；
(3) after discoid slot is formed, brill is moved back, and drill bit, drilling rod carry out radial cuts to coal body and formed without rotation
Radial slot；
(4) step (2) and step (3) are repeated, forms a plurality of discoid slot and radial slot in same drilling, until away from
It is terminated when the tapping point 5-15m of the drilling, completes one group of concordant drilling anti-reflection work of slot release；
(5) repeat step (1) to (4), to other concordants drilling respectively implement drill, slot operation, realize actual mining
The entire coal body concordant drilling anti-reflection work of release in face.
Further, in step (2), the radius of the discoid slot of formation is 2-3m, is highly 40-100mm.
Further, in step (2), when rotate circumferential cutting to coal body specifically includes the following steps:
(2a) high-pressure water pressure is adjusted to 20-50MPa, and the slot time is 5-10min, forms the discoid seam of radius 0.5-1m
Slot；
(2b) high-pressure water pressure is adjusted to 50-80MPa, and the slot time is 3-5min, forms the discoid slot of radius 1-2m；
(2c) high-pressure water pressure is adjusted to 80-150MPa, and the slot time is 1-3min, forms the discoid seam of radius 2-3m
Slot.
Further, in step (2), drilling rod, the drill bit of high-pressure hydraulic slotting device keep rotation status.
Further, the spacing of the adjacent discoid slot is 1-6m.
Further, in step (3), the radius of the radial slot of formation is 1-2m, is highly 30-80mm.
Further, in step (3), moving back drilling speed degree is 5-10min/m, and high-pressure water pressure is maintained at 80-150MPa.
Further, in step (2), drilling rod is moved forward and backward during retreating.
Further, the high-pressure hydraulic slotting device rated pressure 100-150MPa, metered flow 80-125L/min.
Beneficial effects of the present invention:
Concordant drilling slot release anti-reflection method of the invention, concordant drilling construction do not move back brill after the completion, utilize super-pressure
The circumferential cutting of hydraulic slotted liner technique device rotation and ladder pressure mode form discoid slot, further move back brill and utilize superelevation in the process
Pressure hydraulic slotted liner technique device do not rotate with the slow speed of 5-10min/m move back brill formed radial cuts formed slot, repeat the above steps,
Until away from tapping point 5-15m when terminates, it is anti-reflection to realize continuous, the whole release of working face coal body, overcomes traditional concordant watt
The disadvantage that this extraction borehole and segmentation slotting process range are small, discontinuous release is anti-reflection；The method of the present invention is easy, it is easy to operate,
Extracting result is good, reduces stress in coal bed level, has and be widely popularized applying value.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Attached drawing 1 is top view when applying the present invention to drilling；
Attached drawing 2 is the left view when present invention is applied to drilling；
Attached drawing 3 is that concordant mash gas pumping drilling of the present invention carries out slot operation schematic diagram；
Attached drawing 4 is face haulage crossheading, track crossheading slot drilling arrangement schematic diagram.
Description of symbols: 1-drilling；2-discoid slots；3-radial slots；4-coal bodies；5-haulage gates；
6-track crossheadings.
Specific embodiment
The slot release anti-reflection method as shown, the concordant of the present embodiment drills, comprising the following steps:
(1) according to concordant mash gas pumping drilling design requirement, portion's coal is helped in face haulage crossheading 5, track crossheading 6
Body 4 is constructed concordant mash gas pumping drilling 1 respectively, i.e., is constructed concordant mash gas pumping drilling 1, formed using high-pressure hydraulic slotting device
Drilling 1；Drillable length is 80-180m；High-pressure hydraulic slotting device can be structure disclosed in 106150500 A of CN, herein not
It repeats again, rated pressure 100-150MPa, metered flow 80-125L/min.
(2) brill is not moved back, high pressure water is passed through in high-pressure hydraulic slotting device, coal body rotate circumferential cutting and formed justifying
Plate-like slot；Discoid slot can reduce the stress of coal seam horizontal direction, improve gas permeability of coal seam；The discoid seam formed
The radius of slot is 2-3m, is highly 40-100mm.Specifically, following step is specifically included when carrying out to coal body and rotate circumferential cutting
Rapid: (2a) high-pressure water pressure is adjusted to 20-50MPa, and the slot time is 5-10min, forms the discoid slot of radius 0.5-1m；
(2b) high-pressure water pressure is adjusted to 50-80MPa, and the slot time is 3-5min, forms the discoid slot of radius 1-2m；(2c) high pressure
Water pressure is adjusted to 80-150MPa, and the slot time is 1-3min, forms the discoid slot of radius 2-3m.Moreover, during this,
Drilling rod, the drill bit of high-pressure hydraulic slotting device keep rotation status, guarantee the smooth row of slot drilling cuttings using drilling rod, bit
Out, the generation of bit freezing, stick of tool phenomenon is avoided.
(3) after discoid slot is formed, brill is moved back, and drill bit, drilling rod carry out radial cuts to coal body and formed without rotation
Radial slot；Radial slot is equivalent to and has exploited one layer of very thin protective layer in coal seam, reduces the stress of coal seam vertical direction,
Improve gas permeability of coal seam；The radius of the radial slot formed is 1-2m, is highly 30-80mm；Moving back drilling speed degree is 5-
10min/m, high-pressure water pressure are maintained at 80-150MPa；During this, drilling rod is moved forward and backward during retreating, and is guaranteed
Slot drilling cuttings is smoothly discharged, and avoids the generation of bit freezing, stick of tool phenomenon,
(4) step (2) and step (3) are repeated, forms a plurality of discoid slot and radial slot in same drilling, until away from
It is terminated when the tapping point 5-15m of the drilling, completes one group of concordant drilling anti-reflection work of slot release；The adjacent discoid slot
Spacing can be 1-6m；Discoid slot, radial slot are connected with each other coupling and form coal seam entirety in concordant mash gas pumping drilling
Release and anti-reflection；
(5) repeat step (1) to (4), to other concordants drilling respectively implement drill, slot operation, realize actual mining
The entire coal body concordant drilling anti-reflection work of release in face；Adjacent drilling is according to design spacing construction.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered at this
In the scope of the claims of invention.
Claims (9)
- The slot release anti-reflection method 1. a kind of concordant drills, which comprises the following steps:(1) it according to concordant mash gas pumping drilling design requirement, is constructed concordant mash gas pumping drilling using high-pressure hydraulic slotting device, Form drilling；(2) do not move back brill, be passed through in high-pressure hydraulic slotting device high pressure water to coal body rotate circumferential cutting formed it is discoid Slot；(3) after discoid slot is formed, brill is moved back, and drill bit, drilling rod carry out radial cuts to coal body and form radial direction without rotation Slot；(4) step (2) and step (3) are repeated, a plurality of discoid slot and radial slot are formed in same drilling, until away from the brill It is terminated when the tapping point 5-15m in hole, completes one group of concordant drilling anti-reflection work of slot release；(5) repeat step (1) to (4), to other concordants drilling respectively implement drill, slot operation, realize stope it is whole A coal body concordant drilling anti-reflection work of release.
- The slot release anti-reflection method 2. concordant according to claim 1 drills, it is characterised in that: in step (2), formed The radius of the discoid slot be 2-3m, be highly 40-100mm.
- The slot release anti-reflection method 3. concordant according to claim 2 drills, which is characterized in that in step (2), to coal When body rotate circumferential cutting specifically includes the following steps:(2a) high-pressure water pressure is adjusted to 20-50MPa, and the slot time is 5-10min, forms the discoid slot of radius 0.5-1m；(2b) high-pressure water pressure is adjusted to 50-80MPa, and the slot time is 3-5min, forms the discoid slot of radius 1-2m；(2c) high-pressure water pressure is adjusted to 80-150MPa, and the slot time is 1-3min, forms the discoid slot of radius 2-3m.
- The slot release anti-reflection method 4. concordant according to claim 3 drills, it is characterised in that: in step (2), high pressure Drilling rod, the drill bit of hydraulic slotted liner technique device keep rotation status.
- The slot release anti-reflection method 5. concordant according to claim 3 drills, it is characterised in that: the adjacent discoid seam The spacing of slot is 1-6m.
- The slot release anti-reflection method 6. concordant according to claim 3 drills, it is characterised in that: in step (3), formed The radius of the radial slot be 1-2m, be highly 30-80mm.
- The slot release anti-reflection method 7. concordant according to claim 6 drills, it is characterised in that: in step (3), move back brill Speed is 5-10min/m, and high-pressure water pressure is maintained at 80-150MPa.
- The slot release anti-reflection method 8. concordant according to claim 7 drills, it is characterised in that: in step (2), drilling rod It is moved forward and backward during retrogressing.
- The slot release anti-reflection method 9. concordant according to claim 1 drills, it is characterised in that: the high-pressure hydraulic slot Device rated pressure 100-150MPa, metered flow 80-125L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810060728.1A CN108331609B (en) | 2018-01-22 | 2018-01-22 | Bedding drilling, slotting, pressure relief and permeability increasing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810060728.1A CN108331609B (en) | 2018-01-22 | 2018-01-22 | Bedding drilling, slotting, pressure relief and permeability increasing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108331609A CN108331609A (en) | 2018-07-27 |
| CN108331609B true CN108331609B (en) | 2019-08-06 |
Family
ID=62926595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810060728.1A Active CN108331609B (en) | 2018-01-22 | 2018-01-22 | Bedding drilling, slotting, pressure relief and permeability increasing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108331609B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110145233B (en) * | 2019-04-03 | 2021-06-22 | 山东唐口煤业有限公司 | Rock burst coal seam drilling-cutting-pressing-pumping-injecting multi-disaster cooperative prevention and control method |
| CN110145305B (en) * | 2019-04-18 | 2021-01-19 | 天地科技股份有限公司 | Method for preventing and treating rock burst of roadway by hydraulic roof cutting and roadway retaining |
| CN111119978B (en) * | 2019-12-04 | 2021-12-14 | 湖南科技大学 | Method for extracting coal seam gas by drilling holes in bedding and hydraulically cutting seams |
| CN111119980B (en) * | 2019-12-18 | 2021-08-17 | 中煤科工集团重庆研究院有限公司 | Uniform self-pressure-relief anti-reflection drilling method |
| CN111563352B (en) * | 2020-05-13 | 2022-10-04 | 中煤科工集团重庆研究院有限公司 | Water jet joint cutting pressure determination method based on solid-liquid two-phase theory |
| CN114251078A (en) * | 2020-09-24 | 2022-03-29 | 天津昌鑫油田服务有限公司 | Hydraulic slotting method |
| CN113187393B (en) * | 2021-03-16 | 2022-05-17 | 中煤科工集团重庆研究院有限公司 | Hydraulic cutting horizontal guiding device based on gravity guiding mechanism and using method |
| CN114635744A (en) * | 2022-04-14 | 2022-06-17 | 山东科技大学 | Deep low-permeability high-stress thick coal seam three-dimensional network extraction method |
| CN115467647B (en) * | 2022-10-19 | 2023-07-18 | 中煤科工集团重庆研究院有限公司 | Water jet cutting method of parallel layer directional plane slot |
| CN115559772B (en) * | 2022-10-24 | 2024-04-09 | 中煤科工集团重庆研究院有限公司 | Bedding drilling directional hydraulic kerf pressure relief and reflection increase method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966372A (en) * | 2012-12-17 | 2013-03-13 | 中国矿业大学 | Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| CN103133028A (en) * | 2013-03-12 | 2013-06-05 | 河南理工大学 | Underground coal seam hydrofracture crack oriented developing method |
| CN104612640A (en) * | 2015-01-12 | 2015-05-13 | 中国矿业大学 | Underground coal mine drilling, heat injection and hole sealing integration method |
| CN106437612A (en) * | 2016-10-25 | 2017-02-22 | 中煤科工集团重庆研究院有限公司 | Bedding gas extraction drilling hole sealing method and hole sealing structure thereof |
| CN107575204A (en) * | 2017-10-26 | 2018-01-12 | 重庆大学 | A kind of underground coal mine slot pressurize is oriented to pressure break anti-reflection method |
-
2018
- 2018-01-22 CN CN201810060728.1A patent/CN108331609B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102966372A (en) * | 2012-12-17 | 2013-03-13 | 中国矿业大学 | Slotting induced-flow pressure-relief anti-reflection method for complicated seam |
| CN103133028A (en) * | 2013-03-12 | 2013-06-05 | 河南理工大学 | Underground coal seam hydrofracture crack oriented developing method |
| CN104612640A (en) * | 2015-01-12 | 2015-05-13 | 中国矿业大学 | Underground coal mine drilling, heat injection and hole sealing integration method |
| CN106437612A (en) * | 2016-10-25 | 2017-02-22 | 中煤科工集团重庆研究院有限公司 | Bedding gas extraction drilling hole sealing method and hole sealing structure thereof |
| CN107575204A (en) * | 2017-10-26 | 2018-01-12 | 重庆大学 | A kind of underground coal mine slot pressurize is oriented to pressure break anti-reflection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108331609A (en) | 2018-07-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108331609B (en) | Bedding drilling, slotting, pressure relief and permeability increasing method | |
| CN101915083B (en) | Method for extracting coalbed gases from coal mines by upper and lower combination | |
| CN105971663B (en) | A kind of the drilling arrangement and anti-reflection method of coal seam high-pressure hydraulic slot pressure break | |
| CN104879159B (en) | A kind of devices and methods therefor of weak seam stope anti-reflection mash gas extraction | |
| CN110318674B (en) | Method for preventing outburst caused by cracking of roadway roof | |
| CN101666241B (en) | Integrated drilling-blasting-pressurizing-drawing protrusion preventing method for regional gas control | |
| CN107387034A (en) | Non- well cementing casing pipe completion coal bed gas horizontal well pumping method | |
| CN102080519A (en) | Method for extracting coal bed gas by negative pressure on ground through gas-coal simultaneous extraction | |
| CN105089493B (en) | Ground vertical well combines pressure released seam gas pumping method with underground layer-through drilling | |
| CN102619552A (en) | Directional hydraulic pressing penetration, permeability increase and outburst elimination method of guide groove | |
| CN102493833A (en) | Depressurized extraction method for cutting through roof or floor of coal seam by abrasive water jet | |
| CN104405283A (en) | Technique for extracting gas from L-shaped ground drilling well in mining area | |
| CN105804786B (en) | A kind of weak seam bottom plate layer-through drilling pressure rushes anti-reflection method | |
| CN111441817B (en) | Method for reinforcing gas extraction by synergistic effect of coal seam drilling jet fracturing and mining pressure | |
| CN102678092A (en) | Method for commonly extracting coal and coal bed gas by up-hole and down-hole joint construction | |
| CN104405281A (en) | Casing drilling technique for over-goaf | |
| CN109751075A (en) | Middle hard coal seam concordant drilling gas administering method | |
| CN108643867A (en) | Coal extraction coal bed gas technique is drawn in a kind of release, water-jet | |
| CN110306934A (en) | The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes | |
| CN112302578B (en) | Method for exploiting structural coal bed gas by horizontal well stress release | |
| CN108086901A (en) | Cross-layer drilling mesh slot permeability increasing method | |
| CN103498644A (en) | Outburst prevention method in rock cross-cut coal uncovering and gas outburst coal seam double-curtain grouting | |
| CN102678166A (en) | Method for increasing gas extraction rate by permeability increasing of single thick coal seam | |
| CN105971563B (en) | A kind of lower part tool post method exploits the pumping method for the compound old dead zone coal bed gas to be formed | |
| CN105134213B (en) | Regional drilling and coal mining process method |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |