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7482311 |
Self-destructing filter cake
A composition and method are given for self-destructive fluid loss additives and filter cakes in wellbores and subterranean formations. The fluid loss additives and filter cakes are formed from a...
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7470419 |
Granules of powdery mineral and method for production of granules
The present application relates to granules of powdery mineral particles produced by spray granulation of a liquid slurry comprising powdery minerals particles having particle size below 10 m, at...
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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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7449431 |
Additive for increasing the density of a fluid for casing annulus pressure control
A method of controlling the pressure of a casing annulus in a subterranean well that includes injecting into the casing annulus a composition including a base fluid and a polymer coated colloidal...
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7448448 |
System and method for treatment of a well
A fluid injection system is used in a well. Fluid stages are arranged in repeating series within a tubing of the fluid injection system to facilitate control over effects of injection. A sensor...
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7380606 |
Composition and process for well cleaning
Disclosed is a microemulsion well treatment microemulsion that is formed by combining a solvent-surfactant blend with a carrier fluid. In preferred embodiments, the solvent-surfactant blend...
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7361628 |
Remote delivery of latex drag-reducing agent without introduction of immiscible low-viscosity flow facilitator
Latex drag reducers and systems for delivering latex drag reducers are disclosed. The latex drag reducers comprise a polymer that is formed via an emulsion polymerization reaction dispersed in a...
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7259192 |
Molecular weight reduction of polysaccharides by electron beams
A method of depolymerizing galactomannan-type polysaccharide polymers and xanthan, preferably galactomannans, to a pre-selected lower molecular weight by irradiation with high energy electron...
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7186673 |
Stability enhanced water-in-oil emulsion and method for using same
A method for enhancing the stability of a water-in-oil emulsion pretreating at least a portion of the oil prior to emulsification. The pretreatment step may consist of adding polymers to the oil,...
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7049436 |
Carbon dioxide compatible non-aqueous crosslinked fracturing fluids and methods for their use
Alcohol based hydraulic fracturing fluids useful for treating oil and gas wells are disclosed. The fluids are compatible with carbon dioxide, and comprise an alcohol, a polymer, a crosslinking...
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7030064 |
Bentonite nodules
Compressed bentonite-containing nodules are disclosed as are methods for their production and methods for using them to plug wells.
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6923260 |
Mitigation of proppant sticking in removing downhole tools
It has been discovered that sticking caused by proppants used in a frac pack or gravel pack operation during hydrocarbon recovery efforts can be mitigated by placing a proppant anti-sticking fluid...
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6908888 |
Viscosity reduction of viscoelastic surfactant based fluids
Methods and compositions are disclosed for controlled addition of components that decrease the viscosity of the viscoelastic surfactant fluids or for controlled changes in the electrolyte...
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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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6720292 |
Controlling fluid flow in a subterranean formation with a reinforced clay gel
A method is provided for blocking high permeability regions in subterranean geological formations, using a reinforced swelling clay gel. A reinforced clay slurry is prepared by mixing swelling...
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6613720 |
Delayed blending of additives in well treatment fluids
The effect of various chemical or biological agents in well treatment fluids can be delayed by sequestering the agents in the discontinuous phase of an emulsion for a period of time, before the...
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6586372 |
Additive for increasing the density of a fluid and fluid comprising such additive
An additive which increases the density of wellbore fluids used during the construction or repair of oil, gas, injection, water or geothermal wells comprises solid colloidal particles of weight...
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6399544 |
High solids bentonite slurries and method for preparing same
Pumpable and flowable bentonite clay slurries having a bentonite solids content of about 50% or greater have been prepared for the first time through the use of a non-aqueous fluidizing agent,...
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6194356 |
Gelling composition for wellbore service fluids
A wellbore service fluid comprising viscoelastic surfactants in combination with cross-linkable, preferably hydrophobically modified, water soluble polymers is described, particularly applicable to...
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6143699 |
Process for reducing permeability in a subterranean formation
A method is provided for blocking high permeability channels in subterranean geological formations, using swelling clay. A slurry is prepared by mixing swelling clay, such as bentonite, into an...
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6051535 |
Asphaltene adsorption inhibition treatment
A subterranean formation is treated to inhibit adsorption of asphaltenes by injecting a treatment fluid containing a sacrificial compound, such as a lignosulfonate. The lignosulfonate may be...
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5658861 |
Delayed borate crosslinked fracturing fluid having increased temperature range
The crosslinking of galactomannan gum fracturing fluids by borate ion is delayed for high-temperature applications by encapsulating the boron with a polymer coating. The crosslink-delay time is...
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5602083 |
Use of sized salts as bridging agent for oil based fluids
An oil-based fluid system has been discovered using a distribution of salt particle sizes, an oil or water/oil emulsion, a suspending agent for suspending the salt particles in the oil and a...
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5543387 |
Surfactant additive for oilfield acidizing
Subterranean oil-bearing formations are treated with aqueous acid solutions which include an effective amount of an alkoxylated alkyl substituted phenol sulfonate which exhibits both antisludge and...
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5483986 |
Method of displacing liquids through pipes
Improved methods of displacing a first liquid through a pipe with a second liquid while preventing the first and second liquids from mixing are provided. In accordance with the methods, a plug is...
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5401425 |
Recovering enhanced oil recovery surfactants by temperature cycling
A method for recovering surfactants from produced fluids by mixing with produced fluids about 0.1% to about 5% of a nonionic surfactant having a phase inversion temperature above the temperature of...
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5358565 |
Steam injection profile control agent and process
A method and composition for controlling the profile of a formation where temperatures higher than 400° F. are encountered. An aqueous solution of an organoammonium silicate, alkali metal or...
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5358052 |
Conditioning of formation for sandstone acidizing
A damaged zone of a subterranean oil-bearing formation is treated with three fluids: (a) solvent; (b) a formation conditioning fluid, preferably carbon dioxide, to miscibly displace oil from the...
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5356565 |
In-line foam generator for hydrocarbon recovery applications and its use
A foam generator is provided for in-line installation within a surface tubing network. The generator has a foaming chamber with a plurality of permeable screens positioned in series along a...
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4880057 |
Process for removing carbonate from wells
A process of removing carbonates from a well of a water collection and treatment system utilizes "aggressive" water obtained prior to the end of the water treatment process to remove carbonate...
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