WO1992015511A1 - Method for providing a user with a gas supply - Google Patents
Method for providing a user with a gas supply Download PDFInfo
- Publication number
- WO1992015511A1 WO1992015511A1 PCT/RU1992/000025 RU9200025W WO9215511A1 WO 1992015511 A1 WO1992015511 A1 WO 1992015511A1 RU 9200025 W RU9200025 W RU 9200025W WO 9215511 A1 WO9215511 A1 WO 9215511A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gas
- saturated
- fact
- paragraph
- different
- 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.)
- Ceased
Links
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
- 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
- E21B43/18—Repressuring or vacuum methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G5/00—Storing fluids in natural or artificial cavities or chambers in the earth
-
- 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
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
-
- 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
Definitions
- the invention may be used to create gas for the reservoir, prepared for operation, and supplying it to the user with a simple and reliable process.
- Shzhdu ⁇ em, e ⁇ s ⁇ lua ⁇ i ⁇ uemye ⁇ anee mes ⁇ adeniya uglev ⁇ d ⁇ d ⁇ v is ⁇ schayu ⁇ sya and vn ⁇ v ⁇ yvaemye mes ⁇ vdeniya, ⁇ a ⁇ ⁇ vil ⁇ , ⁇ azyvayu ⁇ sya on znachi ⁇ elny ⁇ ⁇ ass ⁇ yaniya ⁇ ⁇ ⁇ myshlenn ⁇ ay ⁇ n ⁇ v and d ⁇ ugi ⁇ mes ⁇ ⁇ ebleniya ⁇ i ⁇ dn ⁇ g ⁇ gas and ⁇ e ⁇ e ⁇ s ⁇ a in ni ⁇ gas yavlyae ⁇ sya ⁇ ud ⁇ em ⁇ y and d ⁇ g ⁇ s ⁇ ya ⁇ y problem ⁇ b ⁇ az ⁇ vanie same n ⁇ vy ⁇ deposits on account Processes in the earth are not harmful to geological processes.
- the purpose of the invention is the creation of a means of securing a gas from a consumer from a gas-saturated foreign product
- An additional purpose of the invention is the use of natural or artificial sources of food that exist in or for other purposes in order to save energy.
- the intended purpose is achieved by the formation of the capacity of the carrier above the gas-saturated hydrous source and the filling of it with gas due to the loss of gas.
- Fellowship who has a personal name
- 25 may occur due to generation of disturbances, such as explosive and / or acoustic damage.
- Periodic degassing of a saturated gas product can also occur if there is a pressure drop resulting from the consequent loss of pressure.
- Pe ⁇ i ⁇ dichn ⁇ s ⁇ v ⁇ zdeys ⁇ viya ⁇ edelyayu ⁇ is ⁇ dya of ⁇ m ⁇ le ⁇ sa usl ⁇ vy and imenn ⁇ : ⁇ a ⁇ ame ⁇ v s ⁇ s ⁇ yaniya gaz ⁇ nasyschenn ⁇ g v ⁇ d ⁇ n ⁇ sn ⁇ g ⁇ g ⁇ iz ⁇ n ⁇ a ( ⁇ h in pressure ⁇ em ⁇ e ⁇ a ⁇ u ⁇ y, udeln ⁇ g ⁇ ⁇ bema..)
- Eg ⁇ s ⁇ s ⁇ ava and ⁇ iziches ⁇ i ⁇ ⁇ izi ⁇ - ⁇ imiches ⁇ i ⁇ , ⁇ . h.
- gas can be consumed at a different rate *. in a normal state, free phase, in the form of gas and gas, gas and gas. etc.
- gas evolution from such vents and the presence of gas is inconsequential, which is associated with their geological processes due to thermal distinction and pressure loss, resulting in an increase in gas exhaustion.
- ⁇ a ⁇ aya ne ⁇ avn ⁇ me ⁇ n ⁇ s ⁇ not ⁇ zv ⁇ lyae is ⁇ lz ⁇ va ⁇ evolved gas supply for ne ⁇ s ⁇ eds ⁇ venn ⁇ g ⁇ ⁇ ebi ⁇ eley and even s ⁇ l ⁇ something e ⁇ n ⁇ miches ⁇ i e ⁇ e ⁇ iv- n ⁇ y eg ⁇ ⁇ ans ⁇ i ⁇ v ⁇ i due ⁇ ez ⁇ i ⁇ ⁇ e ⁇ e ⁇ ad ⁇ v pressure and de bi ⁇ a, ch ⁇ and ⁇ ebue ⁇ s ⁇ v ⁇ u ⁇ n ⁇ g ⁇ ⁇ imeneniya u ⁇ azanny ⁇ above ⁇ iem ⁇ v.
- the gas in addition to the loss of gas and gas, the gas is saturated with gas, and in addition to it there is a loss of P ⁇ d em ⁇ s ⁇ yu-na ⁇ - ⁇ i ⁇ elem ⁇ d ⁇ azumevae ⁇ sya ne ⁇ y ⁇ bem, s ⁇ s ⁇ bny ⁇ inya ⁇ separates out the gas, na ⁇ ime ⁇ , ⁇ dzemnye ⁇ us ⁇ y and lyub ⁇ y ⁇ bem ⁇ s ⁇ ans ⁇ va, ⁇ bladayuschy b ⁇ ly ⁇ imi values ⁇ is ⁇ s ⁇ i and ⁇ n ⁇ tsaem ⁇ s ⁇ i than ⁇ uzhayu ⁇ ya gaz ⁇ nasyschenny v ⁇ d ⁇ n ⁇ sny g ⁇ i- z ⁇ n ⁇ ⁇ ysh ⁇ a.
- Spare parts and containers may be subject to a small amount of gas that may be present in the vicinity of other gas-bearing components, which may be a result of any kind of malfunctions.
- the method excludes the possibility of emissions of gas emitted from overlying hydrocarbon-containing areas from the environmental layer.
- a new gas deposit is generated, as a result of which a short-circuit is obtained, in the main, a filled and filled storage tank is provided.
- one option is to choose an area close to the consumer to reduce the cost of the transaction.
- the possibility of such a choice also results in a negative capacitance above the gas-rich hazardous area of the country.
- it may be seismic - 8 - active area or area near operating hydropower stations, railroads, military facilities, explosive devices, industrial plants. ⁇ .
- Fig. 2 takes into account a variant of the occurrence of the method, and, in addition to that, the degassing effect on the gas-saturated water-based material is caused by the combination of minerals.
- Fig. 3 illustrates a variation of the availability of the device, for example, a 20-liter tank above the gas-saturated material is found in the vicinity of
- the best variants of the invention are 25 Bad gas-rich natural products (1) in the region, convenient for operation, any choice is necessary for any use.
- In order to take advantage of the incinerating gas there is an operation to create an artificial space above the living room * - 30 gas condenser (3). They ensure that the gas is taken from the storage tank by creating a hole from the well (4).
- ⁇ ⁇ dn ⁇ m of va ⁇ ian ⁇ v is ⁇ lz ⁇ va- 35 Nia iz ⁇ b ⁇ e ⁇ eniya on gaz ⁇ nasyschenny v ⁇ d ⁇ n ⁇ sny g ⁇ iz ⁇ n ⁇ v ⁇ z- deys ⁇ vuyu ⁇ ele ⁇ iches ⁇ imi ⁇ az ⁇ yadami, ⁇ susches ⁇ vlyaemymi with ⁇ m ⁇ schyu ele ⁇ az ⁇ yadni ⁇ a, ⁇ azann ⁇ g ⁇ s ⁇ ema ⁇ iches ⁇ i ⁇ a ⁇ is ⁇ chni ⁇ l ⁇ - ⁇ aln ⁇ g ⁇ degazi ⁇ uyuscheg ⁇ v ⁇ zdeys ⁇ viya (5).
- borehole 2 into a gas-saturated water source characterized by the following parameters:
- ⁇ v ⁇ emya ( ⁇ sle) ⁇ vedeniya v ⁇ zdeys ⁇ viya u ⁇ ugimi ⁇ lebaniyami in v ⁇ d ⁇ - n ⁇ sn ⁇ m g ⁇ iz ⁇ n ⁇ e nachinae ⁇ sya selection ⁇ as ⁇ v ⁇ enn ⁇ g ⁇ gas, ⁇ - ⁇ y on account mensheg ⁇ udeln ⁇ g ⁇ ⁇ s ⁇ avneniyu weight with a specific ves ⁇ m v ⁇ dy ⁇ dnimae ⁇ sya nave ⁇ and s ⁇ a ⁇ livae ⁇ sya in em ⁇ s ⁇ i-na ⁇ - ⁇ i ⁇ ele and za ⁇ em, che ⁇ ez ⁇ e ⁇ i ⁇ vanny uchas ⁇ Well 4 is lifted up. The flow of gas from the wells is regulated.
- Sweet water is characterized by a high gas saturation (2581 n.cm.cub./l - 3172 n.a.
- the supplied gases are predominantly methane, and their concentration reaches 83-95.
- the heavy hydrocarbon content does not exceed 5.
- the gas composition is divided by nitrogen 10 and acid components up to 0.5.
- the total gas utilization rate is 21-51 PS.
- a borehole with a depth of about 3000 m is drilled.
- a well-known reservoir is the accumulator, which is completely absorbed in the course of gas.
- After venting and installing a gas-water border it is possible to produce a gas outlet.
- the amount of gas received from the storage tank is dependent on the movement of the gas-dry contact (G) and is shared with it. Gas is produced from the upper part of the tank, and most of the bore holes are used to control geophysical methods. If there is no seismic activity for a long time, there is an additional degassing effect from one of the above described operations.
- the proposed method makes it possible: to bring into operation 5 volumes of gas that were not previously used and are not available for unavailable reserves; to develop gas deposits, including those liquefied to the user;, to optimally solve the problem of gas gas; Combine the tasks of the user and the consumer into a single system of automatic; more effective weight of 10 kg for the processes of gas processing and supply; decrease in the number of servicing personnel; Increase material energy, financial and other costs, including a decrease in growth for gas (and blowing) gas production, and gas d. E ⁇ , and ⁇ . ⁇ . It saves energy and causes environmental problems associated with, for example, long-distance gas transmission.
- the method may also contain other advantages arising from the written works and obvious for the specialist in this area of technology.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
- Geophysics And Detection Of Objects (AREA)
- Sampling And Sample Adjustment (AREA)
- Recrystallisation Techniques (AREA)
- Materials For Medical Uses (AREA)
- Pipe Accessories (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Description
Claims
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU12425/92A AU668082B2 (en) | 1991-03-06 | 1992-01-31 | Method for providing a user with a gas supply |
| US08/108,699 US5450899A (en) | 1991-03-06 | 1992-01-31 | Method of supplying gas to gas consumers |
| DE69224826T DE69224826T2 (de) | 1991-03-06 | 1992-01-31 | Verfahren zur gasbelieferung eines benutzers |
| BR9205723A BR9205723A (pt) | 1991-03-06 | 1992-01-31 | Processo para fornecer gás a consumidores de gás |
| DE0574584T DE574584T1 (de) | 1991-03-06 | 1992-01-31 | Verfahren zur gasbelieferung eines benutzers. |
| CS931838A CZ280242B6 (cs) | 1991-03-06 | 1992-01-31 | Způsob zásobování spotřebitelů plynu zemním plynem |
| EP92904642A EP0574584B1 (fr) | 1991-03-06 | 1992-01-31 | Procede d'alimentation en gaz d'un utilisateur |
| SK940-93A SK278402B6 (en) | 1991-03-06 | 1992-01-31 | Supplying method of consumers with earth gas |
| BG98091A BG60908B1 (bg) | 1991-03-06 | 1993-09-02 | Метод за осигуряване на потребителите с газ |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU914913858A RU2043278C1 (ru) | 1991-03-06 | 1991-03-06 | Способ обеспечения газом потребителя |
| RU4913858/03 | 1991-03-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1992015511A1 true WO1992015511A1 (en) | 1992-09-17 |
Family
ID=21561973
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/RU1992/000025 Ceased WO1992015511A1 (en) | 1991-03-06 | 1992-01-31 | Method for providing a user with a gas supply |
Country Status (13)
| Country | Link |
|---|---|
| US (1) | US5450899A (ru) |
| EP (1) | EP0574584B1 (ru) |
| JP (1) | JP2537587B2 (ru) |
| AT (1) | ATE164139T1 (ru) |
| AU (1) | AU668082B2 (ru) |
| BG (1) | BG60908B1 (ru) |
| CA (1) | CA2105686C (ru) |
| CZ (1) | CZ280242B6 (ru) |
| DE (2) | DE574584T1 (ru) |
| HU (1) | HU212404B (ru) |
| RU (1) | RU2043278C1 (ru) |
| SK (1) | SK278402B6 (ru) |
| WO (1) | WO1992015511A1 (ru) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2063507C1 (ru) * | 1992-12-28 | 1996-07-10 | Акционерное общество закрытого типа "Биотехинвест" | Способ добычи газа из пласта, содержащего ловушку |
| US6214175B1 (en) * | 1996-12-26 | 2001-04-10 | Mobil Oil Corporation | Method for recovering gas from hydrates |
| US6148911A (en) * | 1999-03-30 | 2000-11-21 | Atlantic Richfield Company | Method of treating subterranean gas hydrate formations |
| US7192218B2 (en) * | 2004-02-24 | 2007-03-20 | Ps Systems Inc. | Direct recharge injection of underground water reservoirs |
| US8074670B2 (en) * | 2006-09-26 | 2011-12-13 | PS Systems, Inc. | Maintaining dynamic water storage in underground porosity reservoirs |
| US20080073087A1 (en) * | 2006-09-26 | 2008-03-27 | Ps Systems Inc. | Ventilation of underground porosity storage reservoirs |
| US7972080B2 (en) * | 2007-03-14 | 2011-07-05 | PS Systems, Inc. | Bank-sided porosity storage reservoirs |
| US20090173142A1 (en) * | 2007-07-24 | 2009-07-09 | Ps Systems Inc. | Controlling gas pressure in porosity storage reservoirs |
| CN105134157B (zh) * | 2015-10-10 | 2017-09-01 | 北京化工大学 | 一种应用于页岩气开采的岩层蒸汽压裂装置 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2168942A1 (en) * | 1972-01-27 | 1973-09-07 | Gaz De France | Underground gas storage - for combustible gasesesp natural gas |
| US4149596A (en) * | 1977-04-11 | 1979-04-17 | Exxon Production Research Company | Method for recovering gas from solution in aquifer waters |
| US4149598A (en) * | 1977-04-11 | 1979-04-17 | Exxon Production Research Company | Recovery of gas from water drive gas reservoirs |
| US4444259A (en) * | 1982-01-15 | 1984-04-24 | Schwall Joseph A | Apparatus and method for purging hydrogen sulfide gases from well water |
| US4701072A (en) * | 1985-08-21 | 1987-10-20 | Societe Francaise De Stockage Geologique - Geostock | Draining well for an underground cavity for storing liquefied gas under pressure |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU442287A1 (ru) * | 1972-02-22 | 1974-09-05 | Ивано-Франковский Институт Нефти И Газа | Способ разработки газогидратной залежи |
| US3952800A (en) * | 1974-03-14 | 1976-04-27 | Bodine Albert G | Sonic technique for augmenting the flow of oil from oil bearing formations |
| US4040487A (en) * | 1975-06-23 | 1977-08-09 | Transco Energy Company | Method for increasing the recovery of natural gas from a geo-pressured aquifer |
| US4084638A (en) * | 1975-10-16 | 1978-04-18 | Probe, Incorporated | Method of production stimulation and enhanced recovery of oil |
| US4116276A (en) * | 1976-05-24 | 1978-09-26 | Transco Energy Company | Method for increasing the recovery of natural gas from a geo-pressured aquifer |
| US4049053A (en) * | 1976-06-10 | 1977-09-20 | Fisher Sidney T | Recovery of hydrocarbons from partially exhausted oil wells by mechanical wave heating |
| US4060128A (en) * | 1976-10-01 | 1977-11-29 | W Wallace | Tertiary crude oil recovery process |
| US4114689A (en) * | 1977-05-25 | 1978-09-19 | Newton Bradford Dismukes | Recovery of petroleum |
| US4164978A (en) * | 1978-02-21 | 1979-08-21 | Winton Corporation | Oil extraction method |
| US4199028A (en) * | 1978-11-22 | 1980-04-22 | Conoco, Inc. | Enhanced recovery with geopressured water resource |
| US4378047A (en) * | 1979-02-26 | 1983-03-29 | Elliott Guy R B | Device for in situ recovery of gaseous hydrocarbons and steam |
| US4261419A (en) * | 1979-06-14 | 1981-04-14 | Water Purification Associates | Underground recovery of natural gas from geopressured brines |
| SU859606A1 (ru) * | 1979-07-30 | 1981-08-30 | Сибирский Научно-Исследовательский Институт Нефтяной Промышленности Сибниинп | Способ эксплуатации нефт ной скважины |
| US4417621A (en) * | 1981-10-28 | 1983-11-29 | Medlin William L | Method for recovery of oil by means of a gas drive combined with low amplitude seismic excitation |
| SU1032171A1 (ru) * | 1982-03-17 | 1983-07-30 | Всесоюзный научно-исследовательский институт природных газов | Способ разведки залежей природного газа |
| US4705108A (en) * | 1986-05-27 | 1987-11-10 | The United States Of America As Represented By The United States Department Of Energy | Method for in situ heating of hydrocarbonaceous formations |
| US4638863A (en) * | 1986-06-25 | 1987-01-27 | Atlantic Richfield Company | Well production method using microwave heating |
| US5101899A (en) * | 1989-12-14 | 1992-04-07 | International Royal & Oil Company | Recovery of petroleum by electro-mechanical vibration |
| US5052856A (en) * | 1990-08-13 | 1991-10-01 | Tek M Rasin | Method for underground storage of gas |
-
1991
- 1991-03-06 RU SU914913858A patent/RU2043278C1/ru active
-
1992
- 1992-01-31 AU AU12425/92A patent/AU668082B2/en not_active Ceased
- 1992-01-31 SK SK940-93A patent/SK278402B6/sk unknown
- 1992-01-31 EP EP92904642A patent/EP0574584B1/fr not_active Expired - Lifetime
- 1992-01-31 JP JP4504233A patent/JP2537587B2/ja not_active Expired - Fee Related
- 1992-01-31 HU HU9302494A patent/HU212404B/hu not_active IP Right Cessation
- 1992-01-31 US US08/108,699 patent/US5450899A/en not_active Expired - Fee Related
- 1992-01-31 AT AT92904642T patent/ATE164139T1/de not_active IP Right Cessation
- 1992-01-31 WO PCT/RU1992/000025 patent/WO1992015511A1/ru not_active Ceased
- 1992-01-31 CA CA002105686A patent/CA2105686C/en not_active Expired - Fee Related
- 1992-01-31 CZ CS931838A patent/CZ280242B6/cs unknown
- 1992-01-31 DE DE0574584T patent/DE574584T1/de active Pending
- 1992-01-31 DE DE69224826T patent/DE69224826T2/de not_active Expired - Fee Related
-
1993
- 1993-09-02 BG BG98091A patent/BG60908B1/bg unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2168942A1 (en) * | 1972-01-27 | 1973-09-07 | Gaz De France | Underground gas storage - for combustible gasesesp natural gas |
| US4149596A (en) * | 1977-04-11 | 1979-04-17 | Exxon Production Research Company | Method for recovering gas from solution in aquifer waters |
| US4149598A (en) * | 1977-04-11 | 1979-04-17 | Exxon Production Research Company | Recovery of gas from water drive gas reservoirs |
| US4444259A (en) * | 1982-01-15 | 1984-04-24 | Schwall Joseph A | Apparatus and method for purging hydrogen sulfide gases from well water |
| US4701072A (en) * | 1985-08-21 | 1987-10-20 | Societe Francaise De Stockage Geologique - Geostock | Draining well for an underground cavity for storing liquefied gas under pressure |
Also Published As
| Publication number | Publication date |
|---|---|
| AU668082B2 (en) | 1996-04-26 |
| CZ183893A3 (en) | 1994-08-17 |
| HU212404B (en) | 1996-06-28 |
| EP0574584B1 (fr) | 1998-03-18 |
| BG98091A (bg) | 1995-02-28 |
| SK94093A3 (en) | 1994-04-06 |
| EP0574584A1 (fr) | 1993-12-22 |
| SK278402B6 (en) | 1997-04-09 |
| HU9302494D0 (en) | 1994-03-28 |
| JP2537587B2 (ja) | 1996-09-25 |
| HUT67588A (en) | 1995-04-28 |
| US5450899A (en) | 1995-09-19 |
| CZ280242B6 (cs) | 1995-12-13 |
| DE69224826T2 (de) | 1998-10-29 |
| EP0574584A4 (ru) | 1994-02-16 |
| RU2043278C1 (ru) | 1995-09-10 |
| AU1242592A (en) | 1992-10-06 |
| DE574584T1 (de) | 1994-11-03 |
| ATE164139T1 (de) | 1998-04-15 |
| BG60908B1 (bg) | 1996-06-28 |
| JPH06511521A (ja) | 1994-12-22 |
| DE69224826D1 (de) | 1998-04-23 |
| CA2105686C (en) | 1995-06-06 |
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