| Patents for C09K 8 - Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations (31,745) |
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| 02/20/1991 | EP0413374A2 Composition containing an alkylxylensulfonate and a glycol and its use for enhanced oil recovery |
| 02/19/1991 | US4994195 Mixture of phosphonate, permanganate and copolymer of acrylic acid and allyl hydroxypropyl sulfonate ether |
| 02/19/1991 | US4994194 Altering high temperature subterranean formation permeability |
| 02/19/1991 | CA1280278C Method for distributing an aqueous solution containing a peroxygen in clay |
| 02/12/1991 | US4992182 Scale removal treatment |
| 02/12/1991 | US4991652 Oil reservoir permeability profile control with crosslinked welan gum biopolymers |
| 02/12/1991 | CA1280049C Biopolymeric compositions, and process for their preparation |
| 02/07/1991 | WO1991001431A1 Kill fluid for oil field operations |
| 02/07/1991 | WO1991001430A2 Lost circulation fluid for oil field drilling operations |
| 02/05/1991 | US4990608 Diaphragm wall construction gelatin composition |
| 02/05/1991 | US4990269 Anionic surfactant from alkylene oxide with reactive hydrogen components, such as polyols, acids, isocyanates, sulfonates, phosphates |
| 02/05/1991 | US4990268 Enhanced oil recovery |
| 02/05/1991 | US4990191 Slurry also contains formaldehde-naphalene sulfonate condensate, or inorganic salts |
| 02/05/1991 | US4990028 Anti-friction composition containing MgO and method |
| 02/05/1991 | US4989674 Organosilicon polymer having nonrandom crosslinkages useful in enhanced oil recovery using carbon dioxide flooding |
| 02/05/1991 | US4989673 Lost circulation fluid for oil field drilling operations |
| 01/30/1991 | CN1011432B Extracting method of special crude oil |
| 01/29/1991 | US4988450 Well bore stability with partly hydrolyzed vinyl acetate or acrylamide polymer |
| 01/29/1991 | CA1279534C Precured coated particulate material |
| 01/29/1991 | CA1279470C Mobility control reagents with superior thermal stability |
| 01/29/1991 | CA1279469C Composition and method for fluid loss control in acid fracturing of earthen formations |
| 01/28/1991 | CA2020996A1 Method for improving the steam splits in a multiple steam injection process |
| 01/23/1991 | EP0408700A1 Composition and method for sweetening hydrocarbons. |
| 01/23/1991 | CN1048738A Lost circulation fluid for oil field drilling operations |
| 01/23/1991 | CN1048737A Kill fluid for oil field operations |
| 01/22/1991 | US4986356 Method of removing polymer gels from a petroleum reservoir |
| 01/22/1991 | US4986355 Process for the preparation of fluid loss additive and gel breaker |
| 01/22/1991 | US4986354 Continuous release from microcapsule |
| 01/22/1991 | US4986353 Incorporation in polylactone matrix which degrades in presence of water and heat |
| 01/22/1991 | CA1279315C Stabilizing polysaccharide solutions for tertiary oil recovery at elevated temperature |
| 01/22/1991 | CA1279240C Process and product for sulfur dissolution |
| 01/22/1991 | CA1279181C Composition and method for slowly dissolving siliceous material |
| 01/16/1991 | EP0408297A1 Scale inhibition |
| 01/16/1991 | EP0290486B1 Corrosion inhibitors for clear, calcium-free high density fluids |
| 01/16/1991 | EP0289529B1 Viscosifiers for brines utilizing hydrophilic polymer-mineral oil systems |
| 01/16/1991 | EP0275304B1 Calcium-free clear high density fluids |
| 01/15/1991 | US4985154 Alkyl ether of oligoglycoside |
| 01/15/1991 | US4984635 Forming a rigid foam by injecting a foamable thermosetting resin or prepolymer |
| 01/12/1991 | CA2018146A1 Carbon dioxide-steam co-injection tertiary oil recovery process |
| 01/09/1991 | CN1011150B High temp oil well repairing agent and the uses thereof |
| 01/08/1991 | US4982793 Modified with ceric salt, formation of viscoelastic gels, petroleum recovery |
| 01/08/1991 | US4982792 Method to reduce movement of a CPF device via a shear-thickening fluid |
| 01/08/1991 | US4982791 Protection of wellbore and equipment during controlled pulsation fracturing |
| 01/08/1991 | US4982790 Method to reduce movement of a CPF device via a gelled petroleum based fluid |
| 01/08/1991 | US4982789 Preventing surfactant loss to the formation |
| 01/03/1991 | DE3918265A1 Verfahren zur herstellung von tensidgemischen auf ethersulfonatbasis und ihre verwendung Process for the preparation of surfactant mixtures and to their use on ethersulfonatbasis |
| 01/02/1991 | CN1011038B Copolymer of low-molecular weight acrylate acrylamide and process for salt deposit of at least bufen part prevent aqueous medium produce |
| 01/02/1991 | CA1278645C Water soluble polymers, their preparation and their uses |
| 01/01/1991 | US4981609 Compounds containing sulfur and amino groups |
| 01/01/1991 | US4981601 Quaternary amine, ethoxylated alkylphenol, solvent |
| 01/01/1991 | US4981520 Oil reservoir permeability profile control with crosslinked welan gum biopolymers |
| 01/01/1991 | US4981176 Anionic surfactants |
| 12/29/1990 | WO1991000243A1 Removal of hydrogen sulfide from produced fluids |
| 12/29/1990 | CA2058296A1 Removal of hydrogen sulfide from produced fluids |
| 12/29/1990 | CA2017834A1 Method for controlling lost circulation in well drilling |
| 12/27/1990 | EP0404489A2 Well treatment process |
| 12/27/1990 | EP0404211A1 Method of controlling release of encapsulated breakers |
| 12/27/1990 | CA1278256C Conformance correction to improve hydrocarbon recovery from a subterranean formation |
| 12/27/1990 | CA1278178C Anti-sludging treatment |
| 12/25/1990 | US4980434 Absorbent polymers, their manufacture and uses |
| 12/25/1990 | US4980393 Crosslinking; varying densities for shear stability and injectivity |
| 12/25/1990 | US4980077 Method for removing alkaline sulfate scale |
| 12/25/1990 | US4980074 High density brine containing an aldehyde, its reaction product with a primary amine and a thiocyanate salt |
| 12/25/1990 | US4979564 Method of enhanced oil recovery using low tension viscous waterflood |
| 12/19/1990 | EP0403437A2 Oil based drilling fluids |
| 12/19/1990 | EP0402996A1 Method for gravel packing a well |
| 12/18/1990 | US4978512 Contacting sulfides with reaction product of alkalolamine and aldehyde |
| 12/18/1990 | US4978461 Improved rheology |
| 12/18/1990 | US4977962 Injecting aqueous fluid containing tetraalkylammonium halides |
| 12/18/1990 | US4977960 Reducing gelation time of biopolysaccharide; hydrocarbon recovery |
| 12/18/1990 | CA1278147C Surfactant-containing water thickening polymer |
| 12/18/1990 | CA1277990C Zirconium chelates and their use for cross-linking |
| 12/18/1990 | CA1277972C Delayed crosslinker composition containing organic titanium complexes |
| 12/18/1990 | CA1277825C Fluid loss control additives and drilling fluids containing same |
| 12/18/1990 | CA1277824C Miscible gas enhanced oil recovery method using oil-brine compatible pre-formed foam |
| 12/12/1990 | EP0401842A1 Diaphram wall construction gelation composition |
| 12/12/1990 | EP0401431A1 Formation fracturing process |
| 12/12/1990 | CA2008752A1 Method for gravel packing a well |
| 12/11/1990 | US4977225 Process for preparation of acrylonitrile polymers with low K value |
| 12/11/1990 | US4977116 Method for making lightweight proppant for oil and gas wells |
| 12/11/1990 | US4976316 Well completion |
| 12/11/1990 | US4976315 Enhanced oil recovery |
| 12/11/1990 | CA1277492C Sand consolidation method employing latex |
| 12/06/1990 | WO1990015050A1 Process for preparing tenside mixtures based on ether sulphonates and use of said tenside mixtures |
| 12/06/1990 | CA2058761A1 Process for preparing tenside mixtures based on ether sulphonates and use of said tenside mixtures |
| 12/05/1990 | CN1010684B Method to produce homopolymer and copolymer with monomer containing amid sulfonic acid (or salt) |
| 12/04/1990 | US4975482 Viscoelastic fluids formed through the interaction of polymerizable vesicles and alkyl-containing polymers (C-2381) |
| 12/04/1990 | US4975208 With fluorocarbon surfactants |
| 12/04/1990 | US4975109 Bactericide, fungicide and algaecide |
| 12/04/1990 | US4974678 Fluid additive and method for treatment of subterranean formations |
| 12/04/1990 | US4974677 Profile control process for use under high temperature reservoir conditions |
| 12/04/1990 | CA1277186C Compositions and a process for preparing water dispersible polymers |
| 12/04/1990 | CA1277129C Pyrolytic carbon coating of media improves gravel packing and fracturing capabilities |
| 11/29/1990 | WO1990014496A1 Subterranean permeability modification by using microbial polysaccharide polymers |
| 11/29/1990 | WO1990014402A1 Use of selected ester oils in water-based drilling fluids of the o/w emulsion type and corresponding drilling fluids with improved ecological acceptability |
| 11/29/1990 | WO1990014401A1 The use of selected oleophilic alcohols in water-based drilling fluids of the o/w emulsion type and corresponding drilling fluids with improved ecological acceptability |
| 11/29/1990 | WO1990014400A1 Use of selected oleophilic ethers in water-based drilling fluids of the o/w emulsion type and corresponding drilling fluids with improved ecological acceptability |
| 11/28/1990 | EP0399767A2 Interpolymers useful for treating subterranean formations |
| 11/28/1990 | EP0399270A1 Use of oleophilic selected ethers in water based drilling fluids of the oil-in-water emulsion type, and drilling fluids with improved ecological properties |
| 11/28/1990 | CN1047322A Multi-stage polymer particles having hydrophobically-modified, ionically-soluble stage |