NO328358B1 - Fremgangsmate for degradering av celluloseholdige fluider under komplettering, overhaling og frakturering av olje- og gassbronner - Google Patents
Fremgangsmate for degradering av celluloseholdige fluider under komplettering, overhaling og frakturering av olje- og gassbronner Download PDFInfo
- Publication number
- NO328358B1 NO328358B1 NO19973156A NO973156A NO328358B1 NO 328358 B1 NO328358 B1 NO 328358B1 NO 19973156 A NO19973156 A NO 19973156A NO 973156 A NO973156 A NO 973156A NO 328358 B1 NO328358 B1 NO 328358B1
- Authority
- NO
- Norway
- Prior art keywords
- fluid
- cellulosic
- enzyme system
- cellulose
- polymer
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims description 140
- 238000000034 method Methods 0.000 title claims description 21
- 230000015556 catabolic process Effects 0.000 title description 7
- 238000006731 degradation reaction Methods 0.000 title description 7
- 108090000790 Enzymes Proteins 0.000 claims description 79
- 102000004190 Enzymes Human genes 0.000 claims description 79
- 229920002678 cellulose Polymers 0.000 claims description 41
- 239000001913 cellulose Substances 0.000 claims description 39
- 230000015572 biosynthetic process Effects 0.000 claims description 32
- 229920000642 polymer Polymers 0.000 claims description 32
- 239000003431 cross linking reagent Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims description 8
- 238000004132 cross linking Methods 0.000 claims description 5
- 125000002353 D-glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000005086 pumping Methods 0.000 claims description 4
- 239000008103 glucose Substances 0.000 claims description 3
- GUBGYTABKSRVRQ-CUHNMECISA-N D-Cellobiose Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)OC(O)[C@H](O)[C@H]1O GUBGYTABKSRVRQ-CUHNMECISA-N 0.000 claims 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 claims 1
- 229920006037 cross link polymer Polymers 0.000 claims 1
- 229940088598 enzyme Drugs 0.000 description 63
- 235000010980 cellulose Nutrition 0.000 description 36
- 239000000499 gel Substances 0.000 description 30
- 238000005755 formation reaction Methods 0.000 description 28
- 239000004576 sand Substances 0.000 description 24
- 150000004676 glycans Chemical class 0.000 description 16
- 238000012856 packing Methods 0.000 description 16
- 229920001282 polysaccharide Polymers 0.000 description 16
- 239000005017 polysaccharide Substances 0.000 description 16
- 239000002002 slurry Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 11
- 238000011282 treatment Methods 0.000 description 10
- 230000000903 blocking effect Effects 0.000 description 8
- 239000012267 brine Substances 0.000 description 8
- 150000002772 monosaccharides Chemical class 0.000 description 8
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 8
- 229940106157 cellulase Drugs 0.000 description 7
- 150000002016 disaccharides Chemical group 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000035699 permeability Effects 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 229920000663 Hydroxyethyl cellulose Polymers 0.000 description 5
- 239000004354 Hydroxyethyl cellulose Substances 0.000 description 5
- 230000000593 degrading effect Effects 0.000 description 5
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 229910052726 zirconium Inorganic materials 0.000 description 5
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 108010059892 Cellulase Proteins 0.000 description 3
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 230000002028 premature Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- -1 zirconium ions Chemical class 0.000 description 3
- 108010084185 Cellulases Proteins 0.000 description 2
- 102000005575 Cellulases Human genes 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 2
- 108010056771 Glucosidases Proteins 0.000 description 2
- 102000004366 Glucosidases Human genes 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 1
- PTHCMJGKKRQCBF-UHFFFAOYSA-N Cellulose, microcrystalline Chemical compound OC1C(O)C(OC)OC(CO)C1OC1C(O)C(O)C(OC)C(CO)O1 PTHCMJGKKRQCBF-UHFFFAOYSA-N 0.000 description 1
- 108010001817 Endo-1,4-beta Xylanases Proteins 0.000 description 1
- 108090000604 Hydrolases Proteins 0.000 description 1
- 102000004157 Hydrolases Human genes 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910001622 calcium bromide Inorganic materials 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- WGEFECGEFUFIQW-UHFFFAOYSA-L calcium dibromide Chemical compound [Ca+2].[Br-].[Br-] WGEFECGEFUFIQW-UHFFFAOYSA-L 0.000 description 1
- 239000001768 carboxy methyl cellulose Substances 0.000 description 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 230000004151 fermentation Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 239000008398 formation water Substances 0.000 description 1
- 229940059442 hemicellulase Drugs 0.000 description 1
- 108010002430 hemicellulase Proteins 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- WHYLHKYYLCEERH-UHFFFAOYSA-J tetrasodium;2-oxidopropanoate;zirconium(4+) Chemical group [Na+].[Na+].[Na+].[Na+].[Zr+4].CC([O-])C([O-])=O.CC([O-])C([O-])=O.CC([O-])C([O-])=O.CC([O-])C([O-])=O WHYLHKYYLCEERH-UHFFFAOYSA-J 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Fats And Perfumes (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/370,075 US5566759A (en) | 1995-01-09 | 1995-01-09 | Method of degrading cellulose-containing fluids during completions, workover and fracturing operations of oil and gas wells |
| PCT/US1995/016397 WO1996021798A1 (fr) | 1995-01-09 | 1995-12-29 | Procede de degradation de fluides contenant de la cellulose au cours d'operations de completion de puits de petrole et de gaz |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO973156D0 NO973156D0 (no) | 1997-07-08 |
| NO973156L NO973156L (no) | 1997-07-08 |
| NO328358B1 true NO328358B1 (no) | 2010-02-01 |
Family
ID=23458118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO19973156A NO328358B1 (no) | 1995-01-09 | 1997-07-08 | Fremgangsmate for degradering av celluloseholdige fluider under komplettering, overhaling og frakturering av olje- og gassbronner |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5566759A (fr) |
| EP (2) | EP1022431B1 (fr) |
| DE (2) | DE69535113D1 (fr) |
| DK (2) | DK1022431T3 (fr) |
| NO (1) | NO328358B1 (fr) |
| WO (1) | WO1996021798A1 (fr) |
Families Citing this family (38)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5869325A (en) * | 1996-03-22 | 1999-02-09 | Atlantic Richfield Company | Use of bacteria to break gels used in well treatment fluids |
| US5881813A (en) * | 1996-11-06 | 1999-03-16 | Bj Services Company | Method for improved stimulation treatment |
| US6110875A (en) * | 1997-03-07 | 2000-08-29 | Bj Services Company | Methods and materials for degrading xanthan |
| US5879440A (en) * | 1997-07-28 | 1999-03-09 | Hercules Incorporated | Biostable water-borne paints and processes for their preparation |
| US6138760A (en) * | 1998-12-07 | 2000-10-31 | Bj Services Company | Pre-treatment methods for polymer-containing fluids |
| US6140277A (en) * | 1998-12-31 | 2000-10-31 | Schlumberger Technology Corporation | Fluids and techniques for hydrocarbon well completion |
| GB9915354D0 (en) | 1999-07-02 | 1999-09-01 | Cleansorb Ltd | Method for treatment of underground reservoirs |
| EP2246408A3 (fr) | 1999-11-12 | 2011-01-19 | M-I L.L.C. | Procédé et composition pour la libération déclenchée d'agents de dégradation de polymères pour une utilisation dans les champs pétrolifères |
| US6818594B1 (en) | 1999-11-12 | 2004-11-16 | M-I L.L.C. | Method for the triggered release of polymer-degrading agents for oil field use |
| US7069994B2 (en) * | 2003-03-18 | 2006-07-04 | Cooke Jr Claude E | Method for hydraulic fracturing with squeeze pressure |
| US7044224B2 (en) * | 2003-06-27 | 2006-05-16 | Halliburton Energy Services, Inc. | Permeable cement and methods of fracturing utilizing permeable cement in subterranean well bores |
| US7195071B2 (en) * | 2003-08-05 | 2007-03-27 | Halliburton Energy Services, Inc. | Enzyme compositions and methods of using these compositions to degrade succinoglycan |
| US7347265B2 (en) * | 2004-03-26 | 2008-03-25 | Bj Services Company | Method of forming temporary blocking gel containing guar derivative |
| US8895480B2 (en) * | 2004-06-04 | 2014-11-25 | Baker Hughes Incorporated | Method of fracturing using guar-based well treating fluid |
| GB2422839B (en) * | 2005-01-11 | 2009-06-24 | Schlumberger Holdings | Degradable polymers for wellbore fluids and processes |
| US20070270316A1 (en) * | 2006-05-18 | 2007-11-22 | Bj Services Company | Aqueous alcohol well treatment fluid and method of using the same |
| US7998908B2 (en) | 2006-12-12 | 2011-08-16 | Schlumberger Technology Corporation | Fluid loss control and well cleanup methods |
| US7935662B2 (en) * | 2006-12-12 | 2011-05-03 | Schlumberger Technology Corporation | System, method, and apparatus for injection well clean-up operations |
| US20090050325A1 (en) * | 2007-08-22 | 2009-02-26 | Gray John L | Enzyme enhanced oil recovery (EEOR) for near wellboretreatment of oil and gas with greater than 50% barrel of oil equivalent (BOE) gas production |
| US20090062153A1 (en) * | 2007-08-29 | 2009-03-05 | Gray John L | Enzyme enhanced oil/gas recovery (EEOR/EEGR) using non-gel hydraulic fracturing in hydrocarbon producing wells |
| US20100300693A1 (en) * | 2007-08-29 | 2010-12-02 | Gray John L | Enzyme Surfactant Fluids Used in Non-Gel Hydraulic Fracturing of Oil Wells |
| US20090105097A1 (en) * | 2007-10-22 | 2009-04-23 | Carlos Abad | Degradable Friction Reducer |
| US20090137429A1 (en) * | 2007-11-26 | 2009-05-28 | Rimassa Shawn Mccleskey | Temperature-Extended Enzyme Systems |
| US8844629B2 (en) | 2008-11-21 | 2014-09-30 | Baker Hughes Incorporated | Method of fracturing using alkaliphile derived enzyme breaker |
| US8096360B2 (en) * | 2008-11-21 | 2012-01-17 | Baker Hughes Incorporated | Alkaline β-mannanase containing compositions useful for the hydrolysis of guar in high pH environments and methods related thereto |
| US8016040B2 (en) * | 2008-11-26 | 2011-09-13 | Schlumberger Technology Corporation | Fluid loss control |
| US8030250B2 (en) * | 2009-07-17 | 2011-10-04 | Baker Hughes Incorporated | Method of treating subterranean formations with carboxylated guar derivatives |
| US8486867B2 (en) | 2009-10-15 | 2013-07-16 | Baker Hughes Incorporated | Method of fracturing using mannanohydrolase enzyme breaker |
| US8058212B2 (en) * | 2009-10-15 | 2011-11-15 | Baker Hughes Incorporated | Method of fracturing using mannanohydrolase enzyme breaker |
| CN102686827B (zh) * | 2009-12-11 | 2016-02-24 | 阿科玛股份有限公司 | 石油和天然气刺激操作中的自由基捕获剂 |
| US8371383B2 (en) * | 2009-12-18 | 2013-02-12 | Baker Hughes Incorporated | Method of fracturing subterranean formations with crosslinked fluid |
| US9194223B2 (en) | 2009-12-18 | 2015-11-24 | Baker Hughes Incorporated | Method of fracturing subterranean formations with crosslinked fluid |
| US8517095B2 (en) | 2010-08-09 | 2013-08-27 | Baker Hughes Incorporated | Method of using hexose oxidases to create hydrogen peroxide in aqueous well treatment fluids |
| US8833457B2 (en) | 2011-03-08 | 2014-09-16 | Baker Hughes Incorporated | Sulfates and phosphates as allosteric effectors in mannanohydrolase enzyme breakers |
| CN103573238A (zh) * | 2012-07-26 | 2014-02-12 | 中国石油天然气股份有限公司 | 一种生物酶降解油井压裂液的方法 |
| US9803130B2 (en) | 2012-10-25 | 2017-10-31 | Schlumberger Technology Corporation | Methods of activating enzyme breakers |
| US10259993B2 (en) | 2013-04-15 | 2019-04-16 | Epygen Labs Fz Llc | Stabilized acid precursor and acid-enzyme formulations for drilling mud cake removal |
| US11130904B2 (en) * | 2015-03-25 | 2021-09-28 | Halliburton Energy Services, Inc. | Gravel packing fluids with enhanced thermal stability |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991018974A1 (fr) * | 1990-05-29 | 1991-12-12 | Chemgen Corporation | HEMICELLULASE ACTIVE A DES VALEURS EXTREMES DE pH ET DE TEMPERATURE AINSI QUE SES MOYENS DE PRODUCTION |
| US5165477A (en) * | 1990-12-21 | 1992-11-24 | Phillips Petroleum Company | Enzymatic decomposition of drilling mud |
| US5067566A (en) * | 1991-01-14 | 1991-11-26 | Bj Services Company | Low temperature degradation of galactomannans |
| US5226479A (en) * | 1992-01-09 | 1993-07-13 | The Western Company Of North America | Fracturing fluid having a delayed enzyme breaker |
| US5247995A (en) * | 1992-02-26 | 1993-09-28 | Bj Services Company | Method of dissolving organic filter cake obtained from polysaccharide based fluids used in production operations and completions of oil and gas wells |
| US5201370A (en) * | 1992-02-26 | 1993-04-13 | Bj Services Company | Enzyme breaker for galactomannan based fracturing fluid |
| US5224544A (en) * | 1992-02-26 | 1993-07-06 | Bj Services Company | Enzyme complex used for breaking crosslinked cellulose based blocking gels at low to moderate temperatures |
| US5421412A (en) * | 1994-03-10 | 1995-06-06 | North Carolina State University | Methods and compositions for fracturing subterranean formations |
| US5441109A (en) * | 1994-04-19 | 1995-08-15 | The Western Company Of North America | Enzyme breakers for breaking fracturing fluids and methods of making and use thereof |
-
1995
- 1995-01-09 US US08/370,075 patent/US5566759A/en not_active Expired - Lifetime
- 1995-12-29 DE DE69535113T patent/DE69535113D1/de not_active Expired - Lifetime
- 1995-12-29 EP EP00105907A patent/EP1022431B1/fr not_active Expired - Lifetime
- 1995-12-29 DK DK00105907T patent/DK1022431T3/da active
- 1995-12-29 DK DK95944125T patent/DK0803024T3/da active
- 1995-12-29 WO PCT/US1995/016397 patent/WO1996021798A1/fr active IP Right Grant
- 1995-12-29 EP EP95944125A patent/EP0803024B1/fr not_active Expired - Lifetime
- 1995-12-29 DE DE69521345T patent/DE69521345T2/de not_active Expired - Fee Related
-
1997
- 1997-07-08 NO NO19973156A patent/NO328358B1/no not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| EP0803024A4 (fr) | 1998-12-09 |
| DE69521345T2 (de) | 2001-10-11 |
| WO1996021798A1 (fr) | 1996-07-18 |
| EP1022431B1 (fr) | 2006-07-19 |
| NO973156D0 (no) | 1997-07-08 |
| DE69521345D1 (de) | 2001-07-19 |
| EP1022431A1 (fr) | 2000-07-26 |
| DK1022431T3 (da) | 2006-10-30 |
| DE69535113D1 (de) | 2006-08-31 |
| US5566759A (en) | 1996-10-22 |
| DK0803024T3 (da) | 2001-09-03 |
| NO973156L (no) | 1997-07-08 |
| EP0803024B1 (fr) | 2001-06-13 |
| EP0803024A1 (fr) | 1997-10-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MM1K | Lapsed by not paying the annual fees |