CN101660397A - Gas generator for oil thermal production - Google Patents
Gas generator for oil thermal production Download PDFInfo
- Publication number
- CN101660397A CN101660397A CN200910169733A CN200910169733A CN101660397A CN 101660397 A CN101660397 A CN 101660397A CN 200910169733 A CN200910169733 A CN 200910169733A CN 200910169733 A CN200910169733 A CN 200910169733A CN 101660397 A CN101660397 A CN 101660397A
- Authority
- CN
- China
- Prior art keywords
- combustion chamber
- oil
- gas generator
- cooling water
- cylinder block
- 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
Images
Landscapes
- Spray-Type Burners (AREA)
Abstract
The invention discloses a gas generator for oil thermal production, which comprises an air cylinder body, wherein the air cylinder body comprises a combustion chamber at the upper part and a blendingvaporizing chamber at the lower part, a closed upper cover is arranged at the upper end of the air cylinder body, a gas nozzle connected with the blending vaporizing chamber is arranged at the lower end of the air cylinder body, a compressed air inlet opening communicated with the air cylinder body, a fuel nozzle and an igniter are arranged at the middle part of the upper cover, and an outer cooling water circulating system is also arranged at the outer side of the upper part of the air cylinder body and communicated with the combustion chamber; in addition, the invention also discloses a method for a gas generator for oil thermal production; and the invention can improve the oil recovery ratio, reduce the production cost and also does not generate pollution to the environment.
Description
Technical field
The present invention relates to field of petroleum exploitation, more particularly, relate to the gas generator that a kind of thermal recovery gas injection that improves oil recovery is used.
Background technology
In oilfield development process, utilize oil reservoir natural energy recover petroleum primary oil recovery or title blowing, also claim the energy decline method to recover the oil, its recovery ratio has only about 15%.Improve formation pressure secondary oil recovery by cold water injection, this is the main method of current thin oil exploitation, its recovery ratio is generally 30%-40%, but to the water filling later stage, because oil reservoir ponding is too much, the oil well producing water ratio constantly rises, and oil productivity constantly descends, it is just very uneconomical to continue water flooding recovery again, must stop water filling, seeks new production technique.
Most important method is the oil recovery by heating technology in the tertiary oil recovery technology, inject high temperature and high pressure gas to oil reservoir, improve reservoir temperature and pressure, thereby reduce oil reservoir ponding, reduce viscosity of thickened oil, this oil production method can be exploited out a part to the oil of still failing to exploit again tertiary oil recovery after secondary oil recovery, improve the ultimate recovery of oil.
The China's oil thermal recovery is started in the eighties, mainly is to utilize high pressure steam boiler to inject the water vapour heavy oil heat production to oil reservoir, and be main target with the huff and puff oil recovery, progressively carried out the test of steam gas drive oil recovery technique afterwards again.The defective of water filling steam thermal recovery is as follows:
(1) boiler steam dryness is low, and thermal loss is big, and injecting oil reservoir, to be detained the water yield of getting off too big, heavy crude producing cost height.
(2) steam heating boiler pollutant atmosphere.It will contain gases such as N2, CO2, CO in a large number and enter atmosphere.
(3) water filling steam recovery ratio is low.Because of it only injects single water vapour, be the transmission of heat to the effect of oil reservoir.
Above-mentioned several major defects are that prior art equipment itself can't overcome, and along with the continuation of prior art is used, cost of winning will constantly rise, and oil pump capacity can constantly descend, and not only causes the waste of resource, has also reduced economic benefit.Therefore necessary development new technologies, it is low to improve recovery ratio, reduces cost of winning.
Shen state patent application 99223200 discloses a kind of oil-field thick-oil thermal recovery gas and vapour generator, and it has adopted combustion chamber, vaporizer and jet pipe structure, and the flue gas of oil inflame also can utilize, and has not only improved heat energy utilization rate but also free from environmental pollution.
Constantly surging along with oil price, the cry that improves oil recovery is very strong, be badly in need of the thermal recovery gas injection technology of a kind of high efficiency, low running cost raising oil recovery factor, the gas generator of particularly being badly in need of a kind of suitable use pluralities of fuel substitutes present steam heating boiler.
Summary of the invention
Purpose of the present invention provides a kind of can improve oil recovery, reduces cost of winning, environment is not produced the oil thermal production fuel generator that pollutes simultaneously.
Another object of the present invention provides a kind of method of using gas generator for oil thermal production.
For achieving the above object, the present inventor has carried out a large amount of research and performing creative labour on the basis of existing technology, developed a kind of gas generator for oil thermal production, comprise cylinder block, described cylinder block is made up of the combustion chamber on top and the blending vaporizer of bottom, the upper end of described cylinder block is provided with the loam cake of sealing, its lower end is provided with the combustion gas spout that is connected with the blending vaporizer, the middle part of described loam cake is provided with the compressed air inlet that is communicated with described cylinder block, fuel nozzle and igniter, the outside on described cylinder block top also is provided with outer cooling water circulation system, and described outer cooling water circulation system is connected with described combustion chamber.
The high-pressure common rail oil pump that uses in the external preferred diesel engine of high-pressure oil pump of fuel nozzle, its pressure can reach 30-200 MPa atmospheric pressure, for guaranteeing that final high pressure conditions has good effect.
Combustion chamber and blending vaporizer adopt integral type or adopt bolted mode.
The blending bottom of vaporizing chamber connects by flange with the combustion gas spout.
Described outer cooling water circulation system comprises the airtight annular space that the cylinder lagging that is set in the described cylinder block outside and cylinder lagging surround with described cylinder block, the cylinder lagging on described airtight annular space top is provided with the cooling water inlet, and the cylinder block of its underpart is provided with the vaporization hole for water spraying that is connected with bottom, described combustion chamber.
Be provided with the bosh that parallels with described cylinder block axis in the described airtight annular space, the two ends of described bosh are connected with described cooling water inlet and vaporization hole for water spraying respectively.
Described fuel nozzle is straight spray fine noz(zle).
The upper end of described combustion chamber is provided with the air distribution plate, and described air distribution plate is provided with a plurality of holes, and described atomizer and igniter pass described air distribution plate.
A plurality of pores evenly distribute on the air distribution plate, the air distribution plate adopts exotic materials such as carborundum, silicon nitride, pottery to make, a plurality of pores distribute on the porous compressed air distribution plate, can make compressed air evenly enter the combustion chamber, guarantee that the flame after under different pressures fuel and the burning is in the cylinder axis position all the time, just change the length of flame, do not have fuel to be directed onto on the cylinder body wall, to guarantee fully burning and evenly to spray combustion gas after the blending.
Described combustion chamber internal diameter is greater than described blending vaporizer internal diameter, and wherein the combustion chamber internal diameter is 180-200mm, and blending vaporizer internal diameter is 80-100mm.
The fuel that injects in the described fuel nozzle is methyl alcohol, ethanol, diesel oil, kerosene, crude oil ten natural gases, dimethyl ether, coal bed gas, biogas or coal gas.
A kind of method of using gas generator for oil thermal production: fuel enters from straight spray fine noz(zle) through high-pressure pump or natural gas compressor, the compressed air intlet of compressed air, porous compressed air distribution plate enters the combustion chamber, fuel forms mist in the combustion chamber internal combustion after igniter is lighted, the cooling water inlet of cooling water flow in outer cooling water circulation system enters airtight annular space, flow through bosh in the airtight annular space, cooling water enters the combustion chamber vaporization through the vaporization hole for water spraying and forms water vapour, and described mist is discharged through the combustion gas spout together with steam.
This gas generator fuel can be supplied with by high-pressure pump, and fuel pressure exceeds 2-10 doubly than air supply pressure, and change when big still can the good and fully burning of spray pattern so that fuel is pressed at well, is optimal parameter with the gas of guaranteeing to inject the down-hole.
The air-cylinder type gas generator that thermal recovery gas injection provided by the invention is used is compared with existing steam for thermal recovery of petroleum boiler, the gas that injects the down-hole is not single steam, but the mist of nitrogen, water vapour and the carbon dioxide of 300 ℃ and above temperature, use different fuel that its gas component ratio is changed to some extent, its ratio is about: nitrogen 40%-55%, steam 30%-50%, carbon dioxide 9%-15%, other inert gas 1%.
Beneficial effect: thermal recovery gas injection gas generator volume provided by the invention is little, in light weight, cost is low, reduced investment, and is simple in structure, the reliability height, and maneuverability can skid or vehicle-mounted, and being particularly suitable for has the offshore production platform of strict restriction to use to weight.Nitrogen is very strong in the driving effect to the down-hole oil reservoir in the mist; Steam can bring oil reservoir big heat energy, increases the flowability of oil; Carbon dioxide itself is the good viscosity reduction auxiliary agent that recovers the oil, and can make the oil gas rod phase of down-hole under certain pressure, thereby improves recovery ratio.Thermal recovery gas injection gas generator provided by the invention has been compared remarkable advantages with existing steam for thermal recovery of petroleum boiler, can save energy about 40%, can improve oil recovery factor about 30%.
This gas generator adopts multifuel diesel cylinder principle and frame mode, can utilize standard use for diesel engine high-pressure fuel-feed pump to improve the back and use, and can reduce cost under the prerequisite that guarantees reliability.This gas generator can be made the miniaturization product, directly puts into the down-hole, with the further raising thermal efficiency, improves recovery ratio, and other parts such as fuel and air supply are placed on ground.
Description of drawings
Fig. 1 is a thermal recovery gas injection gas generator structural representation;
Fig. 2 is the poor structure key diagram of cooling among Fig. 1;
Fig. 3 is the sectional drawing of loam cake A among Fig. 1;
Fig. 4 is the sectional drawing of vaporization hole for water spraying B among Fig. 1;
Fig. 5 is the structural representation of air distribution plate C among Fig. 3.
Wherein: 1 cylinder block, 2 straight spray fine noz(zle) 3 compressed air inlet
4 air distribution plates, 5 cooling water inlets, 6 igniters
7 loam cakes, 8 boshes, 9 airtight annular spaces
10 cylinder laggings, 11 combustion chambers, 12 blending vaporizers
13 vaporization hole for water sprayings, 14 combustion gas spouts, 15 flanges.
The specific embodiment
Further set forth the present invention below in conjunction with embodiment, but be not restricted to the present invention.
Shown in Fig. 1-5: a kind of gas generator for oil thermal production that is suitable for improving oil recovery provided by the invention, comprise cylinder block 1, cylinder block 1 is made up of the combustion chamber 11 on top and the blending vaporizer 12 of bottom, the upper end of cylinder block 1 is provided with the loam cake 7 of sealing, the blending vaporizer 12 of cylinder block 1 lower end is connected with combustion gas spout 14 by flange 15, the middle part of loam cake 7 is provided with the compressed air inlet 3 that is communicated with cylinder block 1, fuel nozzle and igniter 6, fuel nozzle is straight spray fine noz(zle) 2, the outside on cylinder block 1 top also is provided with outer cooling water circulation system, outer cooling water circulation system comprises the airtight annular space 9 that the cylinder lagging 10 that is set in cylinder block 1 outside and cylinder lagging 10 surround with described cylinder block 1, the cylinder lagging 10 on airtight annular space 9 tops is provided with cooling water inlet 5, and the cylinder block 1 of its underpart is provided with the vaporization hole for water spraying 13 that is connected with 11 bottoms, combustion chamber; Be provided with the bosh 8 that parallels with cylinder block 1 axis in airtight annular space 9, the two ends of bosh 8 are connected with cooling water inlet 5 and vaporization hole for water spraying 13 respectively.
In addition, the upper end of combustion chamber 11 is provided with air distribution plate 4, air distribution plate 4 is provided with a plurality of holes, atomizer 2 and igniter 6 pass air distribution plate 4, air distribution plate 4 can make compressed air evenly enter the combustion chamber, guarantees that the flame after under different pressures fuel and the burning is in the cylinder axis position all the time, just changes the length of flame, there is not fuel to be directed onto on the cylinder body wall, to guarantee fully burning and evenly to spray combustion gas after the blending.
The fuel that injects in the atomizer 2 is methyl alcohol, ethanol, diesel oil, kerosene, crude oil ten natural gases, dimethyl ether, coal bed gas, biogas or coal gas, and cylinder block 1 and cylinder lagging 10 adopt refractory ceramics, carbofrax material to make.
Fuel enters from straight spray fine noz(zle) 2 during work, and the compressed air intlet 3 of compressed air, porous compressed air distribution plate 4 enter.Adopt high-pressure common rail oil pump equipment, make fuel-supplying pressure exceed 2-10 doubly than air supply pressure, so that fuel press to change when big still at well is can spray pattern good and light the back by igniter 6 and fully burn combustion chamber 11 in, be optimal parameter with the gas of guaranteeing to inject the down-hole.Fuel is fully burning in combustion chamber 11, its burning produces the nitrogen of nearly 2000 degree high temperature, carbon dioxide gas mixture, the bosh 8 of cooling water in the cooling water inlet 5 in the outer cooling circulating system and the airtight annular space 9 of flowing through, enter the bottom of fuel chambers 11 through vaporization hole for water spraying 13, after water and high-temperature gas mixture body meet, give the cooling of high-temperature gas mixture body, the vaporization of water heat absorption simultaneously, ooze mix form in the vaporizer 12 300 about spending by nitrogen, the mist that carbon dioxide and water vapour are formed, its temperature can be adjusted by the thermal recovery technology requirement, and the mist that is adjusted into the most suitable thermal recovery requirement temperature is discharged through flange 15 and combustion gas spout 14.
As shown in Figure 1: a kind of thermal recovery gas injection air-cylinder type gas generator that is suitable for improving oil recovery provided by the invention comprises the cylinder block 1 of pottery, directly sprays fine noz(zle) 2, compressed air inlet 3, silicon carbide porous compressed air distribution plate 4, cooling water inlet 5, igniter 6, loam cake 7, bosh 8, airtight annular space 9, cylinder lagging 10, combustion chamber 11, blending vaporizer 12, vaporization hole for water spraying 13, combustion gas spout 14, flange 15.
It is 1mm that gas generator of the present invention directly sprays fine noz(zle) 2 outlet diameters, 15 holes that diameter is 2mm of porous compressed air distribution plate 4 distributions, and vaporization hole for water spraying 13 diameters are 2mm.Combustion chamber 11 is 1: 2 with the length ratio of blending vaporizer 12, and combustion chamber 11 diameters are 180mm, and blending vaporizer 12 diameters are 100mm.
Methyl alcohol enters from straight spray fine noz(zle) 2 through external high-pressure common rail oil pump during work, and the compressed air intlet 3 of compressed air, porous compressed air distribution plate 4 enter combustion chamber 11.Adopt the high-pressure common rail oil pump, make fuel-supplying pressure exceed 5-7 doubly than air supply pressure, so that fuel press to change when big still at well is can spray pattern good and light the back by igniter 6 and fully burn combustion chamber 11 in, be optimal parameter with the gas of guaranteeing to inject the down-hole.Fuel is fully burning in combustion chamber 11, its burning produces the nitrogen of nearly 2000 degree high temperature, carbon dioxide gas mixture, the bosh 8 of cooling water in the cooling water inlet 5 in the outer cooling circulating system and the airtight annular space 9 of flowing through, enter 11 bottoms, combustion chamber through gasification hole for water spraying 13, after water and high-temperature gas mixture body meet, give the cooling of high-temperature gas mixture body, while water endothermic gasification, in blending vaporizer 12, form 300 degree by nitrogen, the mist that carbon dioxide and water vapour are formed, its temperature can be adjusted by thermal recovery worker's requirement, and the mist that is adjusted into the most suitable thermal recovery requirement temperature is through flange 15 and 14 discharges of combustion gas spout and injection well head.
Fuel adopts ethanol to enter through external high-pressure common rail oil pump in this example, and it is 1.5mm that this gas generator directly sprays fine noz(zle) 2 outlet diameters, 10 holes that diameter is 2mm of porous compressed air distribution plate 4 distributions, and vaporization hole for water spraying 13 diameters are 2mm.Combustion chamber 11 is 1: 2 with the length ratio of blending vaporizer 12, and combustion chamber 11 diameters are 180mm, and blending vaporizer 12 diameters are 100mm.
Fuel adopts the external natural gas compressor of natural gas via to enter in this example, and it is 1.5mm that this gas generator directly sprays fine noz(zle) 2 outlet diameters, 15 holes that diameter is 2mm of porous compressed air distribution plate 4 distributions, and vaporization hole for water spraying 13 diameters are 2mm.Combustion chamber 11 is 1: 2 with the length ratio of blending vaporizer 12, and combustion chamber 11 diameters are 180mm, and blending vaporizer diameter is 100mm.
Embodiment 4 is substantially with embodiment 1
Fuel adopts diesel oil in this example, 20 holes that diameter is 2mm of porous compressed air distribution plate 4 distributions
Claims (8)
1, a kind of gas generator for oil thermal production, comprise cylinder block (1), described cylinder block (1) is made up of the combustion chamber (11) on top and the blending vaporizer (12) of bottom, the upper end of described cylinder block (1) is provided with the loam cake (7) of sealing, its lower end is provided with the combustion gas spout (14) that is connected with blending vaporizer (12), the middle part of described loam cake (7) is provided with the compressed air inlet (3) that is communicated with described cylinder block (1), fuel nozzle and igniter (6), it is characterized in that: the outside on described cylinder block (1) top also is provided with outer cooling water circulation system, and described outer cooling water circulation system is connected with described combustion chamber (11).
2, gas generator for oil thermal production according to claim 1, it is characterized in that: described outer cooling water circulation system comprises the airtight annular space (9) that the cylinder lagging (10) that is set in described cylinder block (1) outside and cylinder lagging (10) surround with described cylinder block (1), the cylinder lagging (10) on described airtight annular space (9) top is provided with cooling water inlet (5), and the cylinder block of its underpart (1) is provided with the vaporization hole for water spraying (13) that is connected with bottom, described combustion chamber (11).
3, gas generator for oil thermal production according to claim 2, it is characterized in that: be provided with the bosh (8) that parallels with described cylinder block (1) axis in the described airtight annular space (9), the two ends of described bosh (8) are connected with described cooling water inlet (5) and vaporization hole for water spraying (13) respectively.
4 according to the described gas generator for oil thermal production of claim 1, it is characterized in that: described fuel nozzle is straight spray fine noz(zle) (2).
5 gas generator for oil thermal production of stating according to claim 4, it is characterized in that: the upper end of described combustion chamber (11) is provided with air distribution plate (4), described air distribution plate (4) is provided with a plurality of holes, and described atomizer (2) and igniter (6) pass described air distribution plate (4).
6, according to the described gas generator for oil thermal production of the arbitrary claim of claim 1-5, it is characterized in that: described combustion chamber (11) internal diameter is greater than described blending vaporizer (12) internal diameter.
7, the gas generator for oil thermal production of stating according to claim 6 is characterized in that: the fuel that injects in the described atomizer (2) is methyl alcohol, ethanol, diesel oil, kerosene, crude oil ten natural gases, dimethyl ether, coal bed gas, biogas or coal gas.
8, a kind of method of using gas generator for oil thermal production, fuel enters from straight spray fine noz(zle) (2) through high-pressure pump or natural gas compressor, the compressed air intlet of compressed air (3), porous compressed air distribution plate (4) enters combustion chamber (11), (11) internal combustion forms mist to fuel in the combustion chamber after igniter (6) is lighted, it is characterized in that: the cooling water inlet (5) of cooling water flow in outer cooling water circulation system enters airtight annular space (9), flow through bosh (8) in the airtight annular space (9), cooling water enters combustion chamber (11) vaporization through vaporization hole for water spraying (13) and forms water vapour, and described mist is discharged through combustion gas spout (14) together with steam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910169733A CN101660397A (en) | 2008-08-29 | 2009-08-28 | Gas generator for oil thermal production |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810146420 | 2008-08-29 | ||
| CN200810146420.5 | 2008-08-29 | ||
| CN200910169733A CN101660397A (en) | 2008-08-29 | 2009-08-28 | Gas generator for oil thermal production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101660397A true CN101660397A (en) | 2010-03-03 |
Family
ID=41788636
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200910169733A Pending CN101660397A (en) | 2008-08-29 | 2009-08-28 | Gas generator for oil thermal production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101660397A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661138A (en) * | 2012-05-11 | 2012-09-12 | 葛明龙 | Liquid-cooling and gas-cooling air-diesel gas generators and application thereof |
| CN103048143A (en) * | 2012-11-29 | 2013-04-17 | 贵州黎阳航空动力有限公司 | Nozzle outlet area adjusting structure for ground gas turbine test equipment |
| CN104632182A (en) * | 2015-02-03 | 2015-05-20 | 新奥气化采煤有限公司 | Nozzle |
| CN108079907A (en) * | 2017-12-18 | 2018-05-29 | 合肥海川石化设备有限公司 | A kind of new high compound gas generator of mass dryness fraction |
-
2009
- 2009-08-28 CN CN200910169733A patent/CN101660397A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102661138A (en) * | 2012-05-11 | 2012-09-12 | 葛明龙 | Liquid-cooling and gas-cooling air-diesel gas generators and application thereof |
| CN103048143A (en) * | 2012-11-29 | 2013-04-17 | 贵州黎阳航空动力有限公司 | Nozzle outlet area adjusting structure for ground gas turbine test equipment |
| CN103048143B (en) * | 2012-11-29 | 2015-01-14 | 贵州黎阳航空动力有限公司 | Nozzle outlet area adjusting structure for ground gas turbine test equipment |
| CN104632182A (en) * | 2015-02-03 | 2015-05-20 | 新奥气化采煤有限公司 | Nozzle |
| CN108079907A (en) * | 2017-12-18 | 2018-05-29 | 合肥海川石化设备有限公司 | A kind of new high compound gas generator of mass dryness fraction |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101358729A (en) | Apparatus for generating steam | |
| CN103822207A (en) | Variable pressure and variable working condition oil burner | |
| CN101660397A (en) | Gas generator for oil thermal production | |
| CN106090903A (en) | Methanol or light-hydrocarbon fuel combustor | |
| CN201386550Y (en) | Mixed gas injection device for heavy oil combustion | |
| CN104673333A (en) | Method and device for quenching coke and recovering energy | |
| CN108592020A (en) | A kind of classification derotation air-flow promotes the burner of liquid fuel evaporation | |
| CN109082288B (en) | Biomass tar combustion system and method | |
| CN201513161U (en) | Device for thermal recovery and gas injection of petroleum | |
| CN107701159A (en) | Oxygen-enriched combustion-supporting heavy oil wells gas injection system and inflating method | |
| CN101858208B (en) | Mixed gas injecting device combusting heavy oil | |
| CN101825279A (en) | Method for achieving water-injecting high-pressure combustion through pipeline of fuel nozzle | |
| CN201386541Y (en) | Wax removal and well cleanout device for gas heat carrier | |
| CN116143425B (en) | Central burner type lime kiln | |
| CN201236672Y (en) | Gas generator for petroleum thermal production | |
| CN2550501Y (en) | Mixed gas injection device for petroleum thermal recovery | |
| CN101214919B (en) | Method for preparing synthetic gas by gasifying biological oil and device thereof | |
| CN101832553A (en) | Water injection type high-pressure combustion method | |
| CN201666571U (en) | Water injection type high-pressure burner | |
| CN210463078U (en) | Liquid fuel puffing fission device system for heating in winter and refrigerating in summer | |
| CN101858205B (en) | Device for removing paraffin and washing well by gas heat carrier | |
| CN211420085U (en) | Liquid fuel puffing fission device system for heating | |
| CN201437721U (en) | Gas generator with oil sprayer | |
| CN1051797C (en) | Method for preparation of mixed gas of light hydrocarbon gas and coal gas | |
| CN203905922U (en) | Double-fuel thermal recovery hybrid drive system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20100303 |