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| Number | Title | Issue Date |
| 7833945 | Treatment fluids with improved shale inhibition and methods of use in subterranean operations Additives and treatment fluids with improved shale inhibition, and associated methods of use in subterranean operations, are provided. The additives and treatment fluids used generally comprise a shale-inhibiting component and one or more silicates. ... | 11/16/2010 |
| 7786049 | Drilling fluids with improved shale inhibition and methods of drilling in subterranean formations The present invention relates to subterranean drilling operations, and more particularly, to drilling fluids that may be used to drill a well bore in a subterranean formation that may demonstrate improved shale inhibition and methods of using such drilling fluids in... | 08/31/2010 |
| 7278485 | Method of formulating and using a drilling mud with fragile gels A method for drilling, running casing in, and/or cementing a borehole in a subterranean formation without significant loss of drilling fluid is disclosed, as well as compositions for use in such method. The method employs a drilling fluid comprising a fragile gel or... | 10/09/2007 |
| 7196039 | Methods of reducing fluid loss in a wellbore servicing fluid Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers ar... | 03/27/2007 |
| 7178610 | Subterranean treatment fluids comprising polyoxazoline compositions and methods of use in subterranean formations The present invention relates to subterranean treatment fluids. In particular, the present invention relates to subterranean treatment fluid compositions that comprise polyoxazoline compositions and methods for using such compositions in subterranean applications. I... | 02/20/2007 |
| 7098171 | Synthetic filtration control polymers for wellbore fluids New polymers, and their applications in water-based wellbore service fluids, such as, for example, drilling fluids, yield desirable filtration control and rheological properties to such fluids even after exposure to HTHP aging. Typical temperatures encountered durin... | 08/29/2006 |
| 7087554 | Drilling fluids with improved shale inhibition and methods of drilling in subterranean formations The present invention provides improved drilling fluids that comprise improved shale inhibiting components, and methods for using these drilling fluids in connection with drilling in a subterranean formation. The drilling fluids comprise water and an improved shale ... | 08/08/2006 |
| 6908887 | Suspending agent A method and composition is provided for a suspending agent for supporting components in drilling fluids, particularly oil-based drilling fluids, the suspending agent comprising the condensation product of a dimer or trimer fatty acid and diethanolamine. ... | 06/21/2005 |
| 6855671 | Water based fluids comprising multivalent salts and low molecular weight, low charge cationic polyacrylamide copolymers A drilling system fluid and method of using same. The drilling system fluid comprises water as a continuous phase, an amount of a multivalent metal, and a quantity of a water soluble polyacrylamide copolymer having a charge density of at least about 1%. In a preferr... | 02/15/2005 |
| 6586371 | Liquid compositions which reversibly viscosify or gel under the effect of shear The present invention provides a water-based fluid, in particular for drilling, completion or for any other intervention in a well such as a hydrocarbon well, in which the viscosity is controlled by a system constituted by precipitated silica nanoparticle... | 07/01/2003 |
| 6451743 | Stable liquid suspension compositions and method of making and use thereof A new stable liquid suspension containing non-soluble particles dispersed in a non-aqueous liquid medium having a concentration of a suspension aid and a method of making and use thereof.... | 09/17/2002 |
| 6436877 | Hydrate inhibition A method of inhibiting or retarding formation of hydrates from water and a lower alkane, such as methane or ethane, involves adding additives which comprise (i) a corrosion inhibitor and (ii) a salt which is of formula [R1 (R2)XR | 08/20/2002 |
| 6380137 | Copolymers and their use as drilling aids The invention provides water-soluble copolymers without crosslinking, consisting of the following components: A 5-95% by weight of bivalent structural units derived from acrylamidopropenylmethylenesulfonic acid or its salts, B 1-45% by weight of bivalent struc... | 04/30/2002 |
| 6281172 | Quaternary nitrogen containing amphoteric water soluble polymers and their use in drilling fluids Water based drilling fluid compositions which contain at least one viscosity builder and at least one rheological control agent wherein the rheological control agent is an amphoteric polymer, the cationic groups of the amphoteric polymer being quaternary ... | 08/28/2001 |
| 6251836 | Hydrate inhibition A hydrate inhibitor comprising a blend of an additive (i) and at least one of an additive (ii) and an additive (iii) wherein additive (i) is a polymer of an ethylenically unsaturated N-heterocyclic carbonyl compound, with 6-8 ring atoms in the heterocycli... | 06/26/2001 |
| 6204224 | Polyalkyl methacrylate copolymers for rheological modification and filtration control for ester and synthetic based drilling fluids A drilling fluid system for use in oil and gas well drilling operations is described having a rheological modifier/control agent comprising a polyalkyl methacrylate copolymer containing a small amount of vinyl pyrrolidone, a weighting agent, optionally an... | 03/20/2001 |
| 6124245 | Drilling fluid additive and process therewith A composition is provided which comprises a polymer comprising repeat units derived from an unsaturated amide, an N-vinyl lactam, and optionally, a vinyl acid. Also provided is a water-based fluid composition which can be used as drilling fluid wherein th... | 09/26/2000 |
| 6107256 | Method of and additive for controlling fluid loss from a drilling fluid This invention provides a composition for and a method of using the composition to reduce the loss of liquid from aqueous compositions employed while rotary drilling. The composition of this invention comprises a polymeric material selected from homopolym... | 08/22/2000 |
| 5858928 | Gel of an apolar medium, its use for the preparation of water-based drilling fluids The invention relates to a gel made of apolar medium including: an apolar medium, a "multichain" liquid surface-active agent in acidic form, soluble or dispersible in the said apolar medium, an agent for neutralizing the said "multichain" surface-active agent, from... | 01/12/1999 |
| 5654261 | Permeability modifying composition for use in oil recovery A method and use for a dry composition comprising a mixture of water-soluble polymer and an aluminum citrate preparation is disclosed. The polymer is capable of cross-linking in the presence of water and aluminum ions. Any water-soluble polymer known to t... | 08/05/1997 |
| 5292367 | Dispersant compositions for subterranean well drilling and completion A dispersant for spacer fluids, cement slurries, completion fluids and mixtures of drilling fluids and cement slurries used for drilling and cementing subterranean wells.... | 03/08/1994 |
| 5099928 | Non-polluting dispersing agent for drilling fluids based on freshwater or salt water A non-polluting dispersing agent for drilling fluids based on soft water or salt water. A dispersing agent for aqueous drilling fluids, optionally saline, belonging to the group of polymers and/or copolymers containing acid functions which is characterize... | 03/31/1992 |
| 5035812 | Thermostable polymers The present invention provides a thermostable polymer comprising a) 16 to 67 mole % of structural components of the formula: ##STR1## b) 5 to 42 mole % of structural components of the formula: ##STR2## wherein R1, R2 and R... | 07/30/1991 |
| 5032296 | Well treating fluids and additives therefor An additive for reducing the water loss and improving other properties of well treating fluids in high temperature subterranean environments and well treating fluids including the additive are provided. The additive comprises a mixture of a water soluble ... | 07/16/1991 |
| 4797450 | Additives for water-base drilling fluid and process An additive for water-base drilling fluid compositions used for drilling subterranean wells is disclosed. In one embodiment, the additive is a sulfonated copolymer of recurring units of a maleimide monomer and recurring units of a vinyl monomer. In anothe... | 01/10/1989 |
| 4792412 | High temperature stable aqueous brine fluids viscosified by polyvinylpyrrolidone There is provided an aqueous brine fluid containing a high salt concentration and a polyvinylpyrrolidone polymer or copolymer which serves to increase the viscosity thereof, particularly at elevated temperatures of above about 300° F. These fluids are pa... | 12/20/1988 |
| 4740319 | Oil base drilling fluid composition This invention relates to an improved oil-base drilling fluid composition and its use. The improved oil-base drilling fluid composition of this invention is characterized by thixotropic properties which result in a yield point of at least 4.0. The composi... | 04/26/1988 |
| 4704213 | Encapsulated oil absorbent polymers as lost circulation additives for oil based drilling fluids The disclosed invention is a novel drilling fluid additive for use in reducing lost circulation in wellbores and a method for employing the invention additive for reducing such lost circulation. The invention additive is a highly oil absorbent polymer enc... | 11/03/1987 |
| 4690996 | Inverse emulsions Polysaccharide graft copolymers are prepared by a water-in-oil emulsion polymerization process in which the polysaccharide and water-soluble monomer are emulsified in an oil phase containing emulsifying agents and polymerized therein. The resultant emulsi... | 09/01/1987 |
| 4664816 | Encapsulated water absorbent polymers as lost circulation additives for aqueous drilling fluids The disclosed invention is a novel drilling fluid additive for use in reducing lost circulation in wellbores and a method for employing the invention additive for reducing such lost circulation. The invention additive is a highly water absorbent polymer e... | 05/12/1987 |
| 4644020 | Production of high molecular weight vinyl lactam polymers and copolymers Water-soluble polymers comprising an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural resources are prepared by polymerizing an N-vinyl lactam by ... | 02/17/1987 |
| 4552670 | Amphoteric water-in-oil self-inverting polymer emulsion An amphoteric water-in-oil self-inverting polymer emulsion is prepared which contains a copolymer of (1) a nonionic vinyl monomer and (2) an amphoteric vinyl monomer or a terpolymer of (1) a nonionic vinyl monomer, (2) an anionic vinyl monomer and (3) a c... | 11/12/1985 |
| 4514310 | High temperature stable fluids for wellbore treatment containing non-aqueous solvents There are provided wellbore treating fluids containing densifying salt dissolved in a solvent for this salt. This solvent contains at least about 50 percent by weight of a liquid non-aqueous solvent such as, e.g., N-methyl-2-pyrrolidone, such that the ove... | 04/30/1985 |
| 4490261 | Acidic high temperature stable aqueous brine fluids viscosified by basic N-heterocyclic polymers There is provided an aqueous brine fluid having a pH of less than about 5 and containing a high salt concentration and a basic N-heterocyclic polymer or copolymer such as polyvinyl pyridine which serves to increase the viscosity of the fluid, particularly... | 12/25/1984 |
| 4432881 | Water-dispersible hydrophobic thickening agent An aqueous liquid medium having increased low shear viscosity as provided by dispersing into the aqueous medium (1) a water-soluble polymer having pendant hydrophobic groups, e.g., an acrylamide dodecyl acrylate copolymer, and (2) a water-dispersible surf... | 02/21/1984 |
| 4257902 | Water-based industrial fluids Substantially oil-free aqueous industrial fluids comprise (A) up to as much as 99.9 percent by weight water, (B) at least one substantially water-insoluble functional additive stably dispersed in the water and (C) at least one substantially water-soluble ... | 03/24/1981 |
| 4045357 | Hydroxy-aluminum based drilling fluid The disclosure provides an aqueous hydroxy-aluminum drilling fluid having a ratio of hydroxy groups to aluminum atoms in the range of from 1.0 to 2.7 and a concentration of at least 0.5 molar and including an effective amount of a polymer selected from th... | 08/30/1977 |
