Patent application number | Description | Published |
20100126726 | ALKALINE BETA-MANNANASE CONTAINING COMPOSITIONS USEFUL FOR THE HYDROLYSIS OF GUAR IN HIGH pH ENVIRONMENTS AND METHODS RELATED THERETO - Methods and compositions of fracturing formations are provided. The fracturing fluid includes an enzyme breaker that decreases the viscosity of the fracturing fluid over time. The enzyme breaker can be used in environments having a pH value ranging from about 7 to about 12. | 05-27-2010 |
20110092397 | Thermophilic Mannanohydrolase and Fracturing Fluids Containing the Same - A thermophilic mannanohydrolase enzyme may be used as an enzyme breaker for fracturing fluids containing hydratable polymers of guar and underivatized guar. The enzyme is effective in downhole temperatures exceeding 160° F. | 04-21-2011 |
20120031618 | Use of Hexose Oxidases to Create Hydrogen Peroxide in Aqueous Well Treatment Fluids - A hydrocarbon-bearing subterranean formation may be treated with an aqueous well treatment fluid which contains a hexose oxidase, such as glucose oxidase, mannose oxidase or galactose oxidase. The aqueous well treatment fluid further may contain a viscosifying polymer and an aldohexose. The aldohexose reacts in-situ with the hexose oxidase and molecular oxygen to produce hydrogen peroxide. The hydrogen peroxide may then act as a breaker. | 02-09-2012 |
20120055670 | METHOD OF FRACTURING USING MANNANOHYDROLASE ENZYME BREAKER - A thermophilic mannanohydrolase enzyme may be used as an enzyme breaker for fracturing fluids containing hydratable polymers of guar and underivatized guar. The amino acid sequence of the mannanohydrolase is at least 90% homologous to the amino acid sequence of SEQ ID NO:2. | 03-08-2012 |
20120111568 | COMPOSITIONS USEFUL FOR THE HYDROLYSIS OF GUAR IN HIGH pH ENVIRONMENTS AND METHODS RELATED THERETO - Methods and compositions of fracturing formations are provided. The fracturing fluid includes an enzyme breaker that decreases the viscosity of the fracturing fluid over time. The enzyme breaker can be used in environments having a pH value ranging from about 7 to about 12. | 05-10-2012 |
20120227971 | Sulfates and Phosphates as Allosteric Effectors in Mannanohydrolase Enzyme Breakers - The allosteric effectors, sulfate and phosphate, can be used with mannanohydrolase enzymes to better control the break of gelled fracturing fluids in wellbore operations. | 09-13-2012 |
20130312969 | USE OF HEXOSE OXIDASES TO CREATE HYDROGEN PEROXIDE IN AQUEOUS WELL TREATMENT FLUIDS - A hydrocarbon-bearing subterranean formation may be treated with an aqueous well treatment fluid which contains a hexose oxidase, such as glucose oxidase, mannose oxidase or galactose oxidase. The aqueous well treatment fluid further may contain a viscosifying polymer and an aldohexose. The aldohexose reacts in-situ with the hexose oxidase and molecular oxygen to produce hydrogen peroxide. The hydrogen peroxide may then act as a breaker. | 11-28-2013 |
20140041877 | Well Treatment Fluids Containing An Ylide Or A Vitamin B And Methods Of Using The Same - Viscosifying polymers are effectively degraded during a well treatment operation with an ylide breaker or a vitamin B cofactor. The vitamin B cofactor is an ylide, vitamin B | 02-13-2014 |
20150051391 | CONVERSION OF CELLULOSE INTO SIMPLE SUGARS - Cellulose may be converted into simple sugars such as glucose by contacting the cellulose with a compound effective to catalytically cleave the ether bonds of the cellulose. The compound may be a vitamin, a porphyrin, flavins, pyridoxal-containing molecules, and/or a compound containing at least one ylide functional group. The cellulose may be carboxymethyl cellulose (CMC), which may be made by reacting cellulose with chloroacetic acid and a base such as NaOH. The compound may be vitamins (B1, B2, B6, or B12), phosphonium ylides, sulfonium ylides, sulfoxonium ylides, carbonyl ylides, oxonium ylides, asomethine ylides, iminium ylides, halonium ylides, and combinations thereof. The free glucose may be used for fermentation, converted to a biofuel and for other applications. | 02-19-2015 |