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7454322 |
Method for modeling hydrocarbon degradation in an oil deposit
Method of modeling the biodegradation of hydrocarbons trapped in an oil reservoir or trap through the action of the bacterial population in an underlying aquifer. From data relative to the...
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7360593 |
Product for coating wellbore screens
Coatings for well screens that protect the screens from damage as they are inserted into the wellbore and once in the well, release reactive materials to react with and degrade potentially plugging...
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7334641 |
Composition and method to enhance recovery from oil wells
A formulation and method to enhance recovery from an oil wherein the method supplies a mixture of petroleum distillates and terpenoid compounds, and a salt extraction formulation comprising a...
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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...
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7287590 |
Internal breaker for oilfield fluids
Delayed breakers are given that break viscoelastic surfactant fluids inside the pores of formations into which the fluids have been injected. The breakers comprise proteins, proteins that contain...
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7256160 |
Fracturing fluids for delayed flow back operations
It has been discovered that certain fracturing fluid compositions can be used to fracture a subterranean formation and be permitted to stay within the formation for a relatively extended period of...
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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,...
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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...
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7036590 |
Two stage subterranean zone fracturing fluids and methods
The present invention discloses two stage subterranean zone fracturing fluids and methods. A two stage subterranean zone fracturing fluid of the invention comprises a first stage fluid comprising a...
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7021379 |
Methods and compositions for enhancing consolidation strength of proppant in subterranean fractures
Improved methods and compositions for consolidating proppant in fractures formed in subterranean zones are provided. An improvement of this invention comprises using proppant particles having a...
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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...
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6978838 |
Method for removing filter cake from injection wells
A method is given for completing an interval of an open-hole injection well penetrating a subterranean formation when the interface between the wellbore and the formation includes a zone invaded by...
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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...
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6763888 |
Method for treatment of underground reservoirs
A method for treating an underground reservoir, which method comprises introducing into the reservoir a treatment fluid comprising, dissolved or dispersed in water, an ester and a polymer breaker,...
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6642185 |
Borate crosslinked fracturing fluid viscosity reduction breaker mechanism and products
It has been discovered that borate crosslinked fracturing fluid breaker mechanisms are improved by the inclusion of a cation-releasing material. When cations are released or liberated within the...
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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...
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6617285 |
Polyols for breaking of borate crosslinked fracturing fluid
It has been discovered that borate crosslinked fracturing fluid breaker mechanisms are improved by the inclusion of a polyol together with an enzyme. In fact, synergistic results may be achieved...
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6569814 |
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...
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6225262 |
Encapsulated breaker slurry compositions and methods of use
An encapsulated breaker slurry composition for reducing the viscosity of a fracturing fluid. The slurry has a flashpoint above 93° C., and the liquid of the slurry does not facilitate release of...
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6162766 |
Encapsulated breakers, compositions and methods of use
An encapsulated breaker is enclosed within a hydrolytically degradable polymer coating. Compositions containing this encapsulated breaker, methods of making and methods of use are also described.
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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...
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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...
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5869325 |
Use of bacteria to break gels used in well treatment fluids
A method for carrying out a well treatment in a well (e.g. fracturing, sand control, etc.) wherein a high-viscosity treatment fluid containing a gel (e.g. a polymeric gelling agent) is flowed down...
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5813466 |
Delayed acid for gel breaking
A crosslinked water-based gel, for example a gel plug in an underground rock formation or a pipeline, is broken by an enzyme and a substrate which is capable of being converted by the enzyme into...
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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...
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5580844 |
Encapsulated breaker chemical
According to the present invention, there is provided a coated breaker chemical in which the coating comprises a blend of a neutralized sulfonated ionomer and asphalt. Preferably, the coating...
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5566759 |
Method of degrading cellulose-containing fluids during completions, workover and fracturing operations of oil and gas wells
A method is shown for reducing the viscosity of a cellulose-containing fluid used during workover, fracturing or well completion operations. An enzyme system is used to degrade the polymer, whereby...
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5551515 |
Hemicellulase active at extremes of Ph and temperature and utilizing the enzyme in oil wells
Soil bacteria can be isolated which produce an enzyme capable of catalyzing the degradation of mannan-containing hemicellulose under conditions combining high pH and high temperature. Such bacteria...
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5441109 |
Enzyme breakers for breaking fracturing fluids and methods of making and use thereof
The present invention is directed to new enzyme breakers for breaking fracturing fluids or blocking gels, wherein the enzyme breakers only have activity above a selected temperature, i.e., no...
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5421412 |
Methods and compositions for fracturing subterranean formations
A method of fracturing a subterranean formation which surrounds a well bore comprises the steps of providing a fracturing fluid, and injecting the fracturing fluid into the well bore at a pressure...
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5247995 |
Method of dissolving organic filter cake obtained from polysaccharide based fluids used in production operations and completions of oil and gas wells
The invention shows a method of degrading damaging material within a subterranean formation of a well bore using an enzyme treatment. Filter cakes and very viscous fluids are such damaging...
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5226479 |
Fracturing fluid having a delayed enzyme breaker
The invention is directed toward a breaker system for breaking fluids used to fracture subterranean formations. Specifically, the invention relates to a breaker system comprised of an enzyme...
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5201370 |
Enzyme breaker for galactomannan based fracturing fluid
A method of fracturing a subterranean formation in a well bore is shown in which a gellable fracturing fluid is first formed by blending together an aqueous fluid, a hydratable polymer, a suitable...
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5165477 |
Enzymatic decomposition of drilling mud
Drilling mud is rapidly decomposed by admixing one or more enzymes with the mud to selectively degrade one or more polymeric organic viscosifiers therein. A method of cleaning up a well site...
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5103905 |
Method of optimizing the conductivity of a propped fractured formation
Method of reducing the viscosity of a fracturing fluid containing a polymer by introducing both delayed breaker and nondelayed breaker into the fracturing fluid. Preferably, the relative amounts of...
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5067566 |
Low temperature degradation of galactomannans
A method is shown for fracturing a subterranean formation in which a hydratable polymer, crosslinking agent and breaker are combined to form a gelled fracturing fluid. The pH of the fracturing...
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5032297 |
Enzymatically degradable fluid loss additive
In treating oil well down hole bores, a method of treating subterranean formations by fracturing by utilization of a fluid loss additive (FLA) comprising starch or a mixture of natural and modified...
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4879240 |
Microbial control of hydrogen sulfide production by sulfate reducing bacteria
Mutant strains of Thiobacillus denitrificans are used to inoculate an environment containing sulfate and sulfate-reducing bacteria to control the net formation of sulfide. The mutant strains are...
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4667026 |
Defined heat treatment, under acidic conditions, of solutions of polysaccharide biopolymers
Aqueous solutions of polysaccharide biopolymers, e.g., Xanthomonas/carbohydrate fermentation worts, are heat treated for more than 5, but less than 60 minutes, at a pH ranging from 3.5 to 6.2, to...
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4522261 |
Biosurfactant and enhanced oil recovery
A pure culture of Bacillus licheniformis strain JF-2 (ATCC No. 39307) and a process for using said culture and the surfactant lichenysin produced thereby for the enhancement of oil recovery from...
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4501674 |
Method for reducing corrosiveness of aqueous fluids
A method is provided for reducing the corrosiveness of an aqueous fluid, particularly water containing dissolved oxygen and corrosive chemical agents such as naturally-occurring brine. According to...
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4406798 |
Surfactant enhanced injectivity of xanthan mobility control solutions for tertiary oil recovery
An aqueous mobility control solution for tertiary oil recovery from saline oil fields comprises from about 200 to 2000 ppm xanthan biopolymer in the form of clean, unreconstituted fermentation...
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4202795 |
Methods and additives for delaying the release of chemicals in aqueous fluids
Methods and additives are provided for bringing about the delayed release of a chemical such as a gel breaker or demulsifier in an aqueous fluid. The additives are pelletized solids comprised of...
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4169798 |
Well-treating compositions
This invention provides a novel hydraulic fluid composition adapted for fracturing of subterranean formations, which comprises (1) an aqueous medium, (2) methyl ether of polygalactomannan gum as a...
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4143007 |
Thickening agent containing a polygalactomannan gum and a copolymer of an olefinically unsaturated dicarboxylic acid anhydride useful in hydraulic well-treating
This invention provides a novel dry blend composition adapted for application as a thickening agent in aqueous solutions. The composition consists essentially of an admixture of a polygalactomannan...
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4119491 |
Enzyme-filtration clarification of xanthan gum polymer solution
An aqueous xanthan gum polymer solution that contains bacterial cell bodies can be clarified by enzymatically disintegrating the cell bodies and/or filtering the solution to remove suspended...
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3853771 |
PROCESS FOR DISPERSING CELLULAR MICRO-ORGANISMS WITH CHELATING AQUEOUS ALKALINE SURFACTANT SYSTEMS
A contaminant composed of cellular micro-organism materials is dissolved or dispersed by contacting it with an aqueous solution containing at least one surfactant adapted to disperse the outer wall...
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3105014 |
Bacterial treatment of media containing hydrocarbons and sulfides
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2807570 |
Recovery of petroleum oil
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2801218 |
Emulsion gels for well servicing
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