Class 507/101 - Contains enzyme or living microorganism

Subclass of Class 507 - Earth boring, well treating, and oil field chemistry
Definition: Composition comprising an enzyme or a microorganism which
No. of patents: 21
Last issue date: 05/03/2011

Number	Title	Issue Date
7935660	Process for disruption of filter cakes A process for producing a self-disrupting filter cake in an underground formation, which process comprises: (a) incorporating into a drilling fluid a solid polymer capable of being converted by hydrolysis into one or more organic acids; (b) using the drilling fluid ...	05/03/2011
7325603	Methods of well treatment A method is disclosed relating to the treatment of a hydrocarbon well, which method comprises administering down a bore hole thermophilic microorganisms capable of generating a well treatment chemical, in particular wherein the bore hole is a producer bore hole and ...	02/05/2008
7267169	Methods for forming a permeable and stable mass in a subterranean formation This invention relates to subterranean treatment operations. More particularly, this invention provides methods that may be useful in providing void-free barriers between a subterranean formation and a portion of a well bore. A nonlimiting example of a method is a m...	09/11/2007
7195068	Filter cake degradation compositions and methods of use in subterranean operations The present invention relates to methods and compositions for degrading filter cakes in subterranean formations, and more specifically, to improved methods and compositions for degrading filter cakes that comprise acid-soluble portions and polymeric portions. In one...	03/27/2007
7196040	Microcapsule well treatment A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release devi...	03/27/2007
7166560	Generating Acid Downhole in Acid Fracturing An acid fracturing method is provided in which the acid is generated in the fracture by hydrolysis of a solid acid-precursor selected from one or more than one of lactide, glycolide, polylactic acid, polyglycolic acid, a copolymer of polylactic acid and polyglycolic...	01/23/2007
7156178	Compositions containing a buffer and a peroxide or peracid useful for treating wells Compositions containing a peroxide or peracid and an organic acid salt buffer are provided. Also provided is a method for utilizing such compositions for removing polymers from oil and gas wells, while simultaneously dissolving encountered calcium carbonate deposits...	01/02/2007
7094736	Sampling of hydrocarbons from geological formations A method of separating from a mixture of oil-based drilling fluid and sample of formation hydrocarbon, the liquid component of the drilling fluid, which method comprises treating, e.g. chemically, the mixture in a way that selectively substantially affects the liqui...	08/22/2006
7052901	Bacteria-based and enzyme-based mechanisms and products for viscosity reduction breaking of viscoelastic fluids It has been discovered that fluids viscosified with viscoelastic surfactants (VESs) may have their viscosities reduced (gels broken) by the direct or indirect action of a biochemical agent, such as bacteria, fungi, and/or enzymes. The biochemical agent may directly ...	05/30/2006
7000701	Compositions and methods for weighting a breaker coating for uniform distribution in a particulate pack The present invention involves methods and compositions for treating subterranean formations, and more specifically, relates to improved methods and compositions for degrading filter cake deposited in a subterranean formation by effecting a uniform distribution of a...	02/21/2006
6818594	Method for the triggered release of polymer-degrading agents for oil field use Disclosed are methods and related compositions for altering the physical and chemical properties of a substrate used in hydrocarbon exploitation, such as in downhole drilling operations. In a preferred embodiment a method involves formulating a fluid, tailored to th...	11/16/2004
6794340	Method for removing drill cuttings from wellbores and drilling fluids A method is disclosed for drilling a wellbore employing a drilling fluid providing the advantages of easy pumpability of a low viscosity fluid with the drill cuttings suspension capability of a highly viscous fluid. The viscosity of the fluid is also easily and quic...	09/21/2004
6638896	Fluids and techniques for hydrocarbon well completion The Invention relates to fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., "completion fluids"), in particular, fluids and techniques are. disclosed and claimed which remove wellbore damage and nea...	10/28/2003
6140277	Fluids and techniques for hydrocarbon well completion The Invention relates to novel fluids and techniques to optimize/enhance the production of hydrocarbon from subterranean formations (e.g., "completion fluids"), in particular, fluids and techniques are disclosed and claimed which remove wellbore damage an...	10/31/2000
6110875	Methods and materials for degrading xanthan Xanthan molecules are degraded using an xanthanase enzyme complex that is stable at temperatures above 250° F., such as those temperatures found in some wellbores and process streams. The xanthanase enzyme complex is produced by a novel soil bacterium. T...	08/29/2000
5951910	Reticulated bacterial cellulose as a rheological modifier for polyol fluid compositions Rheologically modified compositions, and rheologically modified fluid compositions prepared therefrom, containing reticulated bacterial cellulose in a polyol base fluid, are disclosed. The amount of reticulated bacterial cellulose present in the compositi...	09/14/1999
5612293	Drill-in fluids and drilling methods There is provided a method of drilling an oil or gas well, comprising drilling a wellbore into an underground formation in which a drill bit at the lower end of a drill pipe is placed at the bottom of the wellbore; pumping a first drilling fluid into the ...	03/18/1997
4894335	Oil-in-water emulsions containing heteropolysaccharide biopolymers Stable oil-in-water emulsions are prepared containing a relatively high concentration of from 8 to 60% by weight of a heteropolysaccharide bipolymer, e.g., xanthan gum preferably, the emulsions contain greater than 15 up to 60% biopolymer, 40 to 99 parts ...	01/16/1990
4172055	Mixture of hydroxypropylcellulose and poly(maleic anhydride/alkene-1) as a hydrocolloid gelling agent In one embodiment this invention provides a novel fluid composition which comprises an aqueous medium which is thickened with a synergistic viscosity mixture of hydroxypropylcellulose and poly(maleic anhydride/alkene-1). A present invention thickened aque...	10/23/1979
4169818	Mixture of hydroxypropylcellulose and poly(maleic anhydride/alkyl vinyl ether) as a hydrocolloid gelling agent In one embodiment this invention provides a fluid composition which comprises an aqueous medium which is thickened with a synergistic viscosity mixture of hydroxypropylcellulose and poly(maleic anhydride/alkyl vinyl ether) as a novel hydrocolloid gelling ...	10/02/1979
4002204	Timing the deposition of an asphalt plugging material from an asphalt-cationic emulsion In plugging a relatively low temperature subterranean earth formation by injecting a cationic emulsion that contains an asphalt and a pH-increasing reactant that subsequently breaks the emulsion, the timing of the emulsion breaking is improved by using a ...	01/11/1977

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Class 507/101 - Contains enzyme or living microorganism