CN106555566A - Frangible stratum or the cementing method on broken stratum - Google Patents
Frangible stratum or the cementing method on broken stratum Download PDFInfo
- Publication number
- CN106555566A CN106555566A CN201611117704.2A CN201611117704A CN106555566A CN 106555566 A CN106555566 A CN 106555566A CN 201611117704 A CN201611117704 A CN 201611117704A CN 106555566 A CN106555566 A CN 106555566A
- Authority
- CN
- China
- Prior art keywords
- stratum
- completion
- frangible
- well
- cementing
- 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
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000012530 fluid Substances 0.000 claims description 40
- 238000005553 drilling Methods 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 11
- 239000011083 cement mortar Substances 0.000 claims description 6
- 208000034656 Contusions Diseases 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000003245 coal Substances 0.000 abstract description 6
- 230000015572 biosynthetic process Effects 0.000 abstract description 4
- 125000004122 cyclic group Chemical group 0.000 abstract description 3
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 241001074085 Scophthalmus aquosus Species 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
-
- 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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B28/00—Vibration generating arrangements for boreholes or wells, e.g. for stimulating production
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to cementing method technical field, it is a kind of frangible stratum or the cementing method on broken stratum；Carry out in the steps below：The first step, fixedly mounts vibration machine between the casing shoe and float collar of completion casing pipe string.The cementing method on the frangible stratum of the present invention or broken stratum is simple to operate, the wave of oscillation is produced by hydraulic pulse generator, the frangible stratum of energy effectively solving or broken stratum, coal bed gas well cementation completion practice it is difficult and because the setting of casing that formation collapse occurs is difficult and cyclic process in suppress the problem of pump, enable well cementation completion practice safety under the conditions of existing equipment, quickly complete well cementing operation, drastically increase frangible stratum or broken stratum, the well cementation one-time success rate on coal bed gas stratum, the vibration wave that hydraulic pulse generator is produced simultaneously can also greatly improve cementing quality, effectively reduce complexity, the generation of accident rate, significantly reduce the integrated cost of operation.
Description
Technical field
The present invention relates to cementing method technical field, it is a kind of frangible stratum or the cementing method on broken stratum.
Background technology
With the development of social economy, resources requirement is increasing, and resource exploitation environment is also more and more severe, encounters
Situation is more and more.With the exploitation of petroleum resources, easily（）Problem casing and cementings teacher that broken stratum well cementation is present have to
Often face, but existing conventional cementing method is not suitable for easily under many circumstances（）The well cementing operation on broken stratum, needs to seek
Look for a kind of suitable targetedly cementing method to solve.Easily（）The borehole wall landwaste caved in during broken stratum setting of casing may draw
Card lifting sleeve pipe accident, is likely to suppress pump accident because of cave-in in well cementing process, may seriously cause sausage-filling accident, make
It is into substantial amounts of human and material resources and leeway or even serious to causing scrapping for well.
The content of the invention
The invention provides a kind of frangible stratum or the cementing method on broken stratum, overcome above-mentioned prior art no
Foot, its can effectively solving conventional cementing method easily cause cutting ferrule to run affairs therefore scrap with sausage-filling accident or even well, it is uncomfortable
The problem of suitable frangible stratum well cementing operation.
The technical scheme is that by following measures to realize：A kind of frangible stratum or the well cementation side on broken stratum
Method, is carried out in the steps below：The first step, fixedly mounts vibration machine between the casing shoe and float collar of completion casing pipe string；
Second step, will be provided with the completion casing pipe string part lower going-into-well of vibration machine or whole lower going-into-well in after, to completion set
Drill in fluid is pumped in pipe pipe string, drill in fluid flows through vibration machine and flows out to form annular space from completion casing pipe string bottom
Liquid, drill in fluid make vibration machine that vibrations occur together with completion casing pipe string when flowing through vibration machine；3rd step,
Vibration machine occurs vibrations together with completion casing pipe string makes annular space liquid produce fluctuation by the sand setting in the borehole wall or shaft bottom or/and fall block
Carry out pit shaft and band is to ground；4th step, drill in fluid circulation carry out well cementing operation in two weeks to four weeks, to completion casing
Cement mortar is injected in pipe string, be then injected into displacement fluid, until cementing slurry is all replaced between sleeve pipe pipe string and the borehole wall
And bruising；5th step, well cementing operation carry out waiting solidifying, completion after terminating.
The further optimization and/or improvements to foregoing invention technical scheme are presented herein below：
In above-mentioned 4th step, drill in fluid circulates two weeks to four weeks, and the density of drilling completion returning fluid is less than 1.30g/
cm3When, yield value is less than 5Pa, and plastic viscosity carries out well cementing operation for 10mPa.s to 30mPa.s；Or, drill in fluid circulation
Two weeks to four weeks, and the density of drilling completion returning fluid be 1.30g/cm3To 1.80g/cm3When, yield value is less than 8Pa, plasticity
Viscosity carries out well cementing operation for 22mPa.s to 30mPa.s；Or, drill in fluid circulates two weeks to four weeks, and drilling completion is returned
The density for going out liquid is more than 1.80g/cm3When, yield value is less than 15Pa, and plastic viscosity 40mPa.s to 75mPa.s carries out well cementation work
Industry.
The flow velocity of above-mentioned drilling completion returning fluid is less than or equal to 1.0m/min.
Above-mentioned vibration machine is hydraulic pulse generator.
The cementing method on the frangible stratum of the present invention or broken stratum is simple to operate, produces vibration by hydraulic pulse generator
Ripple, can the frangible stratum of effectively solving or broken stratum, coal bed gas well cementation completion practice it is difficult and under formation collapse occurs
The problem of pump is suppressed in sleeve pipe hardly possible and cyclic process, well cementation completion practice is safely and fast completed under the conditions of existing equipment
Well cementing operation, drastically increases frangible stratum or the well cementation one-time success rate on broken stratum, coal bed gas stratum, while waterpower arteries and veins
The vibration wave for rushing generator generation can also greatly improve cementing quality, effectively reduce the generation of complexity, accident rate, greatly drop
The low integrated cost gone into operation.
Description of the drawings
Accompanying drawing 1 is for during entering completion casing pipe string under the present invention or to the view behind shaft bottom during cave-in.
Accompanying drawing 2 is illustrated for the state destroyed after sand bridge by hydraulic pulse generator after present invention injection drill in fluid
Figure.
Accompanying drawing 3 is view when cement mortar and displacement fluid are injected after well of the present invention is cleaned.
Coding in accompanying drawing is respectively：1 is completion casing pipe string, and 2 is vibration machine, and 3 is drill in fluid, and 4 is well
Wall, 5 is sand setting or/and to fall block, and 6 is cement mortar, and 7 is displacement fluid, and 8 is drilling completion returning fluid.
Specific embodiment
The present invention is not limited by following embodiments, can technology according to the present invention scheme and practical situation determining specifically
Embodiment.
In the present invention, for the ease of description, the description of the relative position relation of each part is according to Figure of description 1
Butut mode being described, such as：The position relationship of forward and backward, upper and lower, left and right etc. is the cloth according to Figure of description 1
Figure direction is determining.
With reference to embodiment and accompanying drawing, the invention will be further described：
Embodiment 1, as shown in accompanying drawing 1,2,3, the frangible stratum or cementing method on broken stratum has been carried out in the steps below：First
Step, fixedly mounts vibration machine 2 between the casing shoe and float collar of completion casing pipe string 1；Second step, will be provided with vibration and send out
After in the 1 part lower going-into-well of completion casing pipe string of raw device 2 or in whole lower going-into-wells, drilling well is pumped into in completion casing pipe string 1 complete
Well liquid 3, drill in fluid 3 flow through vibration machine 2 and flow out to form annular space liquid from 1 bottom of completion casing pipe string, drill in fluid 3
Vibration machine 2 is made to occur to shake together with completion casing pipe string 1 when flowing through vibration machine 2；3rd step, vibration machine
2 occur vibrations together with completion casing pipe string 1 makes annular space liquid produce fluctuation by the sand setting in the borehole wall 4 or shaft bottom or/and fall block 5 and carry out
Pit shaft band are to ground；4th step, the circulation of drill in fluid 3 carry out well cementing operation in two weeks to four weeks, to completion casing pipe string 1
Middle injection cement mortar 6, is then injected into displacement fluid 7, until cementing slurry 6 is all replaced between sleeve pipe pipe string and the borehole wall 4
And bruising；5th step, well cementing operation carry out waiting solidifying, completion after terminating.
If completion casing pipe string 1 produces sand bridge during entering well, sand bridge may occur in the case of following two kinds, the first
Situation, enters under completion casing pipe string 1 to midway and produces sand bridge, carries out casing job after turn on pump circulation is normal in the case of this kind；
Another kind of situation, completion casing pipe string 1 are lowered into shaft bottom and produce sand bridge, and in the case of this kind, turn on pump circulation is normal and meets well cementation work
Industry directly carries out well cementing operation after requiring.The vibration wave produced by hydraulic pulse generator, effectively destroys sand bridge, it is to avoid because
Formation collapse and the setting of casing that occurs is difficult and cyclic process in suppress the problem of pump, enable well cementation completion practice in existing equipment condition
Under safely and fast complete well cementing operation, drastically increase frangible stratum or broken stratum, coal bed gas stratum well cementation once
Success rate, while the vibration wave that hydraulic pulse generator is produced can also greatly improve cementing quality, after significantly reducing operation
Integrated cost, for frangible stratum or broken stratum, coal bed gas stratum well cementation provide a good approach.
Embodiment 2, as shown in accompanying drawing 1,2,3, the frangible stratum or cementing method on broken stratum has been carried out in the steps below：
The first step, fixedly mounts vibration machine 2 between the casing shoe and float collar of completion casing pipe string 1；Second step, will be provided with and shake
After in the 1 part lower going-into-well of completion casing pipe string of dynamic generator 2 or in whole lower going-into-well, brill is pumped into in completion casing pipe string 1
Well well completion fluid 3, drill in fluid 3 flow through vibration machine 2 and flow out to form annular space liquid from 1 bottom of completion casing pipe string, and drilling well is complete
Well liquid 3 makes vibration machine 2 occur to shake together with completion casing pipe string 1 when flowing through vibration machine 2；3rd step, vibration
Generator 2 occurs vibrations together with completion casing pipe string 1 makes annular space liquid produce fluctuation by the sand setting in the borehole wall 4 or shaft bottom or/and fall block 5
Carry out pit shaft and band is to ground；4th step, carries out well cementing operation after the circulation of drill in fluid 3 two weeks or four weeks, to completion set
Cement mortar 6 is injected in pipe pipe string 1, displacement fluid 7 is then injected into, until cementing slurry 6 is all replaced to sleeve pipe pipe string and well
Simultaneously bruising between wall 4；5th step, well cementing operation carry out waiting solidifying, completion after terminating.
Embodiment 3, as the optimization of above-described embodiment, in the 4th step, drill in fluid 3 circulates two weeks to four weeks, and
The density of drilling completion returning fluid 8 is less than 1.30g/cm3When, yield value is less than 5Pa, and plastic viscosity is 10mPa.s to 30mPa.s
Carry out well cementing operation；Or, drill in fluid 3 circulates two weeks to four weeks, and the density of drilling completion returning fluid 8 is 1.30g/
cm3To 1.80g/cm3When, yield value is less than 8Pa, and plastic viscosity carries out well cementing operation for 22mPa.s to 30mPa.s；Or, drilling well
Completion fluid 3 circulates two weeks to four weeks, and the density of drilling completion returning fluid 8 is more than 1.80g/cm3When, yield value is less than
15Pa, plastic viscosity 40mPa.s to 75mPa.s carry out well cementing operation.
Embodiment 4, used as the optimization of above-described embodiment, the flow velocity of drilling completion returning fluid 8 is less than or equal to 1.0m/min.
Embodiment 5, used as the optimization of above-described embodiment, vibration machine 2 is hydraulic pulse generator.Waterpower pulse occurs
Two nozzles should be at least provided with device；Jet size on hydraulic pulse generator is designed according to formation condition, nozzle
Size can be exchanged.
Above technical characteristic constitutes embodiments of the invention, and which has stronger adaptability and implementation result, can basis
The non-essential technical characteristic of increase and decrease is actually needed, the demand of different situations is met.
Claims (5)
1. a kind of frangible stratum or the cementing method on broken stratum, it is characterised in that carry out in the steps below：The first step, in completion
Vibration machine is fixedly mounted between the casing shoe and float collar of sleeve pipe pipe string；Second step, will be provided with the completion of vibration machine
After in the lower going-into-well of sleeve pipe pipe string part or in whole lower going-into-well, drill in fluid, drilling completion are pumped into in completion casing pipe string
Liquid flows through vibration machine and flows out to form annular space liquid from completion casing pipe string bottom, and drill in fluid is made when flowing through vibration machine
There are vibrations together with completion casing pipe string in vibration machine；3rd step, vibration machine occur together with completion casing pipe string
Vibrations make annular space liquid produce fluctuation by the sand setting in the borehole wall or shaft bottom or/and fall that block carries out pit shaft and band is to ground；4th step, bores
Well well completion fluid circulation carries out well cementing operation in two weeks to four weeks, in completion casing pipe string injects cement mortar, is then injected into replacing
Liquid, until cementing slurry is all replaced to simultaneously bruising between sleeve pipe pipe string and the borehole wall；5th step, well cementing operation terminates laggard
Row waits solidifying, completion.
2. frangible stratum according to claim 1 or the cementing method on broken stratum, it is characterised in that in the 4th step, drilling well
Completion fluid circulates two weeks to four weeks, and the density of drilling completion returning fluid is less than 1.30g/cm3When, yield value is less than 5Pa, modeling
Property viscosity carries out well cementing operation for 10mPa.s to 30mPa.s；Or, drill in fluid circulates two weeks to four weeks, and drilling completion
The density of returning fluid is 1.30g/cm3To 1.80g/cm3When, yield value is less than 8Pa, and plastic viscosity is 22mPa.s to 30mPa.s
Carry out well cementing operation；Or, drill in fluid circulates two weeks to four weeks, and the density of drilling completion returning fluid is more than 1.80g/
cm3When, yield value is less than 15Pa, and plastic viscosity 40mPa.s to 75mPa.s carries out well cementing operation.
3. frangible stratum according to claim 1 and 2 or the cementing method on broken stratum, it is characterised in that drilling completion is returned
The flow velocity for going out liquid is less than or equal to 1.0m/min.
4. frangible stratum according to claim 1 and 2 or the cementing method on broken stratum, it is characterised in that vibration machine
For hydraulic pulse generator.
5. frangible stratum according to claim 3 or the cementing method on broken stratum, it is characterised in that vibration machine is
Hydraulic pulse generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611117704.2A CN106555566A (en) | 2016-12-07 | 2016-12-07 | Frangible stratum or the cementing method on broken stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611117704.2A CN106555566A (en) | 2016-12-07 | 2016-12-07 | Frangible stratum or the cementing method on broken stratum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106555566A true CN106555566A (en) | 2017-04-05 |
Family
ID=58445350
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611117704.2A Pending CN106555566A (en) | 2016-12-07 | 2016-12-07 | Frangible stratum or the cementing method on broken stratum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106555566A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019085472A1 (en) * | 2017-11-03 | 2019-05-09 | 中国海洋石油集团有限公司 | Tubular column for drill-free and catch-free integrated well cementing and well completion and application thereof |
| CN112252982A (en) * | 2020-12-08 | 2021-01-22 | 中国石油天然气集团有限公司 | Casing method for fragile stratum or broken stratum |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5330006A (en) * | 1992-10-22 | 1994-07-19 | Shell Oil Company | Oil mud displacement with blast furnace slag/surfactant |
| CN202031534U (en) * | 2011-05-16 | 2011-11-09 | 王震 | Downhole rotational-flow shearing generator |
| CN102877813A (en) * | 2012-09-30 | 2013-01-16 | 中国石油集团西部钻探工程有限公司 | Halfway gas-filling well cementing method |
| CN103132940A (en) * | 2011-11-25 | 2013-06-05 | 中国石油天然气集团公司 | Downhole spiral flow shear vibration generator device |
| CN203383777U (en) * | 2013-08-09 | 2014-01-08 | 胜利油田胜机石油装备有限公司 | Axial vibration impulse well cementing device |
| CN203756116U (en) * | 2013-12-31 | 2014-08-06 | 中国石油化工集团公司 | Vibration cementing device |
| CN204457543U (en) * | 2015-03-11 | 2015-07-08 | 东营市健源工贸有限责任公司 | Petroleum casing pipe well cementation vibrator |
| CN104806197A (en) * | 2015-04-22 | 2015-07-29 | 中国石油天然气股份有限公司 | Vibrating well cementation system and vibrating well cementation method |
| CN105525892A (en) * | 2014-09-28 | 2016-04-27 | 中国石油化工集团公司 | Casing pipe vibrating device |
-
2016
- 2016-12-07 CN CN201611117704.2A patent/CN106555566A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5330006A (en) * | 1992-10-22 | 1994-07-19 | Shell Oil Company | Oil mud displacement with blast furnace slag/surfactant |
| CN202031534U (en) * | 2011-05-16 | 2011-11-09 | 王震 | Downhole rotational-flow shearing generator |
| CN103132940A (en) * | 2011-11-25 | 2013-06-05 | 中国石油天然气集团公司 | Downhole spiral flow shear vibration generator device |
| CN102877813A (en) * | 2012-09-30 | 2013-01-16 | 中国石油集团西部钻探工程有限公司 | Halfway gas-filling well cementing method |
| CN203383777U (en) * | 2013-08-09 | 2014-01-08 | 胜利油田胜机石油装备有限公司 | Axial vibration impulse well cementing device |
| CN203756116U (en) * | 2013-12-31 | 2014-08-06 | 中国石油化工集团公司 | Vibration cementing device |
| CN105525892A (en) * | 2014-09-28 | 2016-04-27 | 中国石油化工集团公司 | Casing pipe vibrating device |
| CN204457543U (en) * | 2015-03-11 | 2015-07-08 | 东营市健源工贸有限责任公司 | Petroleum casing pipe well cementation vibrator |
| CN104806197A (en) * | 2015-04-22 | 2015-07-29 | 中国石油天然气股份有限公司 | Vibrating well cementation system and vibrating well cementation method |
Non-Patent Citations (3)
| Title |
|---|
| 吴波等: "新型涡轮式井下径向振动固井装置的研究与应用", 《复杂油气藏》 * |
| 韩崇福等: "振动固井技术在辽河油田的试验应用", 《石油钻采工艺》 * |
| 韩玉安等: "国内外振动固井技术的发展现状", 《钻采工艺》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019085472A1 (en) * | 2017-11-03 | 2019-05-09 | 中国海洋石油集团有限公司 | Tubular column for drill-free and catch-free integrated well cementing and well completion and application thereof |
| CN112252982A (en) * | 2020-12-08 | 2021-01-22 | 中国石油天然气集团有限公司 | Casing method for fragile stratum or broken stratum |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105781499B (en) | A kind of multistage anti-sand method of ocean gas hydrate decompression exploitation | |
| CN105464638A (en) | Coal bed gas well pulse radial drilling and double-pulsating hydrofracturing method | |
| CN102720453B (en) | Method and device for mechanically removing sand and draining liquid from pit shaft of oil/gas well in underbalanced state | |
| CN104533354B (en) | Plug type sand control method for slim hole sidetracked well | |
| CN106499368A (en) | A kind of deep seafloor top layer gas hydrate mining methods | |
| CN106593329B (en) | Gas lift reverse circulation negative pressure sand removal method and fettling installation | |
| CN110748315A (en) | Method for treating casing damage of oil-water well | |
| CN107939358A (en) | Carbonate rock hydrocarbon reservoir open hole completion tubing string and post-processing method | |
| CN102226375B (en) | Method for forming easy-to-collapse drilled hole | |
| CN202325239U (en) | Hydraulic jetting radial drilling device | |
| CN106555566A (en) | Frangible stratum or the cementing method on broken stratum | |
| CN104763348B (en) | The brill of the bionical nozzle of a kind of build-in expands integral type drilling tool and bores expanding method | |
| CN104712287B (en) | A kind of horizontal well ' Safe Density Windows extended method | |
| CN103104203A (en) | Drilling-fluid solid-control control process | |
| CN205297337U (en) | Cave ware is drawn in reaming for well drilling | |
| CN102102503A (en) | Sand prevention method for four-inch small hole | |
| CN102877813B (en) | Half way inflation cementing method | |
| CN105089562A (en) | Preheating variable-frequency injection unblocking process system for water injection well | |
| CN109209299A (en) | A kind of saturation filling of wellbore periphery can the cementing gravel manufacture of intraocular borehole wall method | |
| CN108301769A (en) | A kind of RW types horizontal well construction method and its drilling tool used | |
| CN203603145U (en) | Long spiral drilling machine grouting retaining wall hole forming system | |
| CN202645526U (en) | Jet flow sand blasting cracking device | |
| CN202140077U (en) | Gas drilling foundation-pit-free circulating system | |
| CN208010302U (en) | A kind of spiral groove device of horizontal well pit shaft well-flushing | |
| CN108442895B (en) | Sand washing method for high-leakage oil and gas well |
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 |
Application publication date: 20170405 |
|
| RJ01 | Rejection of invention patent application after publication |