Patent application number | Description | Published |
20090205829 | Polymeric Microspheres as Degradable Fluid Loss Additives in Oilfield Applications - A method of plugging a fracture in a subterranean formation which includes placing into the fracture a composition comprising microspheres or microbeads, wherein the microspheres are created by surface crosslinking of droplets in a water-in-water emulsion. Such microspheres may form a filter cake in the formation. The microspheres may include a chemical agent to be released when the microspheres dissolve. | 08-20-2009 |
20100184631 | PROVISION OF VISCOUS COMPOSITIONS BELOW GROUND - A method of providing a viscous emulsion at a subterranean location accessible via a wellbore, begins by providing an aqueous/aqueous emulsion comprising two aqueous solutions which, at surface temperature and pressure, are able to co-exist as separate aqueous phases in contact with each other. The two phases contain respective solutes which are sufficiently incompatible that they cause phase separation. The dispersed phase is rich in one solute, which may be a thickening polymer, while continuous phase is rich in a second solute, which may comprise surfactant. A hydrophobic liquid is dispersed in this emulsion to become the dispersed phase of a viscous emulsion whose continuous phase is provided by the aqueous/aqueous emulsion. The hydrophobic liquid and the aqueous/aqueous emulsion may be pumped separately down the wellbore to the subterranean location, and allowed to mix there so as to form the viscous emulsion at the subterranean location. On mixing, surfactant from the aqueous/aqueous emulsion may migrate to the oil/water interface, allowing the aqueous phases to become one phase with the result that the emulsion is further thickened by any thickening polymer in its composition. Even more thickening can be achieved by crosslinking the thickening polymer. | 07-22-2010 |
20120132422 | INTERPOLYMER CROSSLINKED GEL AND METHOD OF USING - Disclosed herein is a gel comprising, polyacrylamide crosslinked with a non-metallic crosslinker, the non-metallic crosslinker comprising a polyamine. A method of making the gel and a method of using the gel are also disclosed. | 05-31-2012 |
20120138294 | INTERPOLYMER CROSSLINKED GEL AND METHOD OF USING - Disclosed herein is a gel or a gel concentrate comprising, polyacrylamide crosslinked with a non-metallic crosslinker comprising a polylactam. A well treatment fluid comprising the gel or the gel concentrate, a method of making the gel or the gel concentrate, and a method of using the gel or the gel concentrate are also disclosed. | 06-07-2012 |
20120321809 | SYSTEMS AND METHODS FOR MARINE ANTI-FOULING - An anti-biofouling material for use on marine equipment is described, the anti-biofouling material comprising a polymer system comprising a hydrophobically-modified base polymer, the hydrophobically-modified base polymer comprising a base polymer having a backbone and a hydrophobically derivatized chain extender coupled to said backbone of said base polymer, wherein the hydrophobically derivatized chain extender comprises a hydrophobic moiety. The anti-fouling casing comprises a hydrophobic surface that serves to prevent biofouling of the surface. | 12-20-2012 |
20130116156 | CHEMICAL SEAL RING COMPOSITION AND METHOD OF USING - Disclosed herein is a chemical seal ring composition that includes polyacrylamide crosslinked with a non-metallic crosslinker such as polylactam. Also, described in a method of forming a chemical seal ring from the chemical seal ring composition. | 05-09-2013 |
Patent application number | Description | Published |
20090137432 | pH Sensitive Emulsion System - An oilfield treatment fluid in the form of an emulsion wherein the emulsion contains at least one treatment agent sequestered within a phase of the emulsion, wherein the emulsion is stable when the pH is maintained within a predetermined range, and breaks to release the at least one treatment agent when the pH is changed to a release pH value outside the predetermined stable pH range. | 05-28-2009 |
20090314077 | DOWNHOLE SAMPLING APPARATUS AND METHOD FOR USING SAME - A reservoir sampling apparatus ( | 12-24-2009 |
20100152068 | WELLBORE TREATMENT FLUID - A water-based wellbore treatment fluid contains: one or more viscoelastic-gelling carboxylic acids and/or alkali metal salts thereof; and one or more solubilising alkylolamines. The carboxylic acids and/or alkali metal salts and the alkylolamines are present in the fluid in respective amounts such that, at 25° C., the alkylolamines solubilise a sufficient portion of the carboxylic acids and/or alkali metal salts to render the fluid viscoelastic. A remaining portion of the carboxylic acids and/or alkali metal salts forms a suspension of solid particulates in the fluid. | 06-17-2010 |
20100167967 | WELLBORE TREATMENT WITH HYDROCARBON-RESPONSIVE FLUID CONTAINING OLIGOMERIC VISCOELASTIC SURFACTANT - A treatment of a subterranean formation which contains a hydrocarbon-bearing zone, is carried out using a hydrocarbon-responsive fluid thickened with an oligomeric surfactant consisting of from 2 to 8_linked surfactant monomer subunits. The process of treatment comprises
| 07-01-2010 |
20110146974 | DELIVERY OF NANODISPERSIONS BELOW GROUND - Delivery of a substance to a subterranean location is achieved by suspending the substance as nanoparticles in a carrier fluid in which the substance is insoluble. The procedure may start by forming a dispersible powder composition, which is done by dissolving the substance in a solvent, emulsifying the resulting solution as the dispersed phase of an emulsion, and freeze-drying the emulsion to a powder. On mixing the powder with a fluid in which the substance is insoluble, any soluble constituents of the powder dissolve and the insoluble substance becomes a dispersion of nanoparticles of the substance. Then, the fluid containing the dispersed substance is pumped to the subterranean location. The dispersion of nanoparticles has surprising stability, facilitating transport to the subterranean location. At the subterranean location the dispersed nanoparticles may migrate into other fluid encountered there: more specifically a dispersed tracer substance may migrate from injected water into hydrocarbon in a hydrocarbon reservoir. Another possibility is that dispersion as nanoparticles enables interaction with other constituents of the fluid to be delayed until the subterranean location is reached: more specifically the fluid may contain polymer and the dispersed nanoparticles may comprise an agent which participates in cross-linking and consequent viscosification of the polymer. | 06-23-2011 |
20110303408 | CONCENTRATION OF MINOR CONSTITUENT OF WELLBORE FLUID - A method of processing an aqueous fluid produced from a wellbore in order to collect or remove a minor constituent therefrom, comprises adding one or more solutes to the aqueous fluid so as to form an aqueous mixture which separates into two aqueous phases in contact with each other, with a first solute present at a greater concentration in the larger, first aqueous phase than in the second aqueous phase and a second solute present at a greater concentration in the smaller, second aqueous phase than in the first aqueous phase; while the compositions of the two phases are such that the said minor constituent preferentially partitions into the smaller, second aqueous phase so that the concentration of that constituent in the smaller second phase exceeds its concentration in the larger first aqueous phase. The second aqueous phase with the said constituent concentrated therein is then separated from the first aqueous phase. The process may be used to concentrate a tracer, such as an organic dye, into a reduced volume which can be transported to a remote laboratory. The process may alternatively be used to remove a contaminant or other minor constituent, so as to allow the first aqueous phase to be put to use, eg for cementing or hydraulic fracturing. | 12-15-2011 |
20130319670 | METHODS FOR SERVICING SUBTERRANEAN WELLS - Process fluids comprising more than 1 wt % polyacrylamide and a non-metallic crosslinker may be used to control lost circulation in subterranean wells. The process fluid is placed into a subterranean lost-circulation zone and allowed to crosslink, thereby forming a gel barrier that limits further flow of process fluid into the zone. The non-metallic crosslinker may preferably comprise one or more polylactams. A pH-adjusting agent may also be incorporated into the process fluid. | 12-05-2013 |
20150072905 | VISCOELASTIC COMPOSITIONS - The present invention provides aqueous viscoelastic compositions comprising a cleavable surfactant and possibly also an electrolyte. The cleavable surfactants useful in the present invention comprise at least one weak chemical bond, which is capable of being broken under appropriate conditions, to produce oil soluble and water soluble products typically having no interfacial properties and surface activity compared with the original surfactant molecule. Further, the rheological properties of the aqueous viscoelastic composition are usually altered upon cleavage of the cleavable surfactant generally resulting in the elimination of the viscosifying, viscoelastic and surfactant properties of the composition. Aqueous viscoelastic compositions in accordance with the present invention are suitable for use in oil-field applications, particularly for hydraulic fracturing of subterranean formations. Thus, the present invention also relates to a wellbore service fluid and a method of fracturing a subterranean formation. The present invention also concerns novel cleavable surfactants. | 03-12-2015 |