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| Number | Title | Issue Date |
| 8105984 | Reduced abrasion drilling fluid A reduced abrasion drilling fluid system and method of drilling a borehole by circulating the reduced abrasion drilling fluid through the borehole is disclosed. The reduced abrasion drilling fluid comprises a drilling fluid, a first additive and a weighting agent, w... | 01/31/2012 |
| 7482309 | Methods of drilling wellbores using variable density fluids comprising coated elastic particles The present invention provides variable density fluid compositions and methods for using such compositions in a subterranean formation. One exemplary embodiment of the variable density fluid compositions of the present invention comprises a variable density fluid co... | 01/27/2009 |
| 7393813 | Water-based drilling fluids using latex additives A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formations for hydr... | 07/01/2008 |
| 7271131 | Fluid loss control and sealing agent for drilling depleted sand formations An oil-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean sand formation has been discovered to inhibit or control fluid loss and act as a sealing agent when used to drill in sand formatio... | 09/18/2007 |
| 7147067 | Zeolite-containing drilling fluids Methods and compositions for wellbore treating fluids, especially drilling fluids, that comprise zeolite and a carrier fluid. ... | 12/12/2006 |
| 7067461 | Water-based drilling fluid additive containing graphite and carrier A drilling fluid additive is provided wherein the additive is manufactured by a method comprised of admixing graphite with at least one carrier such as a polypropylene glycol or oil to create a suspended mixture, and allowing the surface of the graphite to be pre-we... | 06/27/2006 |
| 7060660 | Drilling fluid additive system containing talc and graphite A drilling fluid additive system is provided wherein the system comprises: a drilling fluid additive comprising talc, graphite and at least one carrier such as a glycol; and hydrophilic clay, a pH controller, a fluid loss controller, and at least one dispersant.... | 06/13/2006 |
| 7056867 | Drilling fluid additive system containing graphite and carrier A drilling fluid additive system is provided wherein the system is manufactured by a method comprised of admixing graphite with at least one carrier such as a polypropylene glycol or oil to create a suspended mixture, and allowing the surface of the graphite to be p... | 06/06/2006 |
| 7001871 | Water-based drilling fluid additive containing talc and graphite A drilling fluid additive is provided wherein the additive is manufactured by a method comprised of admixing at least one carrier such as a polypropylene glycol to talc and subsequently admixing graphite to the talc and carrier mixture; and then admixing an uintaite... | 02/21/2006 |
| 6881708 | Compositions for solving lost circulation problems A method and composition is provided for sealing a subterranean zone penetrated by a well bore and restoring lost circulation, wherein the composition basically comprises a mixture of latex, melamine-formaldehyde resin, and a catalyst. ... | 04/19/2005 |
| 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 |
| 6849581 | Gelled hydrocarbon compositions and methods for use thereof Gelled organic compositions and methods for using same. The gelled compositions may be liquid organic fluids, such as gelled liquid hydrocarbons, formed from a mixture of an organic-base fluid, a carboxylic acid, and one or more metal source compounds, such as a met... | 02/01/2005 |
| 6821931 | Water-based drilling fluid additive containing talc and carrier A drilling fluid additive is provided wherein the additive is manufactured by a method comprised of admixing colloidal solids such as talc with at least one carrier such as an oil or glycol to create a suspended mixture to thereby allow the colloidal solids to be pr... | 11/23/2004 |
| 6774089 | Water-based drilling fluid additive containing talc and cellulose A drilling fluid additive is provided wherein the additive is manufactured by a method comprised of admixing colloidal solids such as talc with a combination of oil and glycol or cellulose to create a suspended mixture to thereby allow the colloidal solids to be pre... | 08/10/2004 |
| 6737384 | Drilling fluid additive system containing talc and cellulose A drilling fluid additive system is provided wherein the system is manufactured by a method comprised of admixing colloidal solids such as talc with a carrier such as oils and glycols or talc with cellulose to create a suspended mixture to thereby allow the colloida... | 05/18/2004 |
| 6734145 | Drilling fluid additive system containing talc & carrier A drilling fluid additive system is provided wherein the system is manufactured by a method comprised of admixing colloidal solids such as talc with a carrier such as oils or glycols to create a suspended mixture to thereby allow the colloidal solids to be pre-wet o... | 05/11/2004 |
| 6730637 | Reducing fluid loss in a drilling fluid This invention relates to a low toxicity drilling mud oil. In some embodiments, the fluid loss characteristic of the drilling mud oil as used in a borehole can be reduced to less than 0.2 ml/30 minutes by adding about 0.05% to about 2.0% by weight of a butadiene-sty... | 05/04/2004 |
| 6706667 | Shale-stabilizing additives A shale-stabilizing additive is described which comprises a copolymer of an olefinically unsaturated hydrocarbon and an ethylenically unsaturated carboxylic acid, carbocylic acid salt or carboxylic acid anhydride with alkylene oxide based side chains. The additive c... | 03/16/2004 |
| 6703351 | Water-based drilling fluids using latex additives A water-based drilling fluid having a polymer latex capable of providing a deformable latex film on at least a portion of a subterranean formation has been discovered to provide reduced drilling fluid pressure invasion when used to drill in shale formatio... | 03/09/2004 |
| 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 |
| 5700763 | Thermally stable oil-based drilling fluid Oil-base drilling fluids containing a non-sulfonated polymer and/or a non-organophilic clay maintain desirable rheological properties at elevated temperatures.... | 12/23/1997 |
| 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 |
| 5629270 | Thermally stable oil-base drilling fluid Oil-base drilling fluids containing a non-sulfonated polymer and/or a non-organophilic clay maintain desirable rheological properties at elevated temperatures.... | 05/13/1997 |
| 5565513 | Method and composition for delaying the cross-linking of water soluble polymer solutions A stable, non-aqueous liquid suspension of delayed boron cross-linkers comprises an anhydrous boron compound or a sparingly soluble borate suspended in a mixture of mineral spirits (commonly termed as naphtha) and a resin. Anhydrous boron compounds suitab... | 10/15/1996 |
| 5362415 | Acrylic copolymer which is water-soluble or moderately water-soluble and may be crosslinked; and its use A copolymer comprised of at least one monomer having ethylenic unsaturation and a carboxylic acid group, optionally at least one monomer having ethylenic unsaturation and not having a carboxylic acid group, at least one oxyalkylated monomer having ethylen... | 11/08/1994 |
| 5283235 | Compositions containing esters of carboxy-containing interpolymers and methods of using the same This invention relates to a composition comprising a mixture of a brine and a liquid hydrocarbon, and (A) a viscosity increasing amount of at least one ester of a carboxy-containing interpolymer or salt thereof wherein the interpolymer is prepared by poly... | 02/01/1994 |
| 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 |
| 5026490 | Zwitterionic functionalized polymers as deflocculants in water based drilling fluids A water soluble polymer which is characterized by the formula: ##STR1## wherein x is 50 mole percent or 662/3 mole percent or 75 mole percent and y+z is 50 mole percent, when x is 50 mole percent, y+z is 331/3 mole percent, when x is 662/3 mole perce... | 06/25/1991 |
| 5008025 | Sulfonate-containing polymer/polyanionic cellulose combination for high temperature/high pressure filtration control in water base drilling fluids A method and composition for improving high temperature and high pressure filtration control in a water base drilling fluid is described. Polyanionic cellulose is combined with a synthetic sulfonate containing vinyl polymer into a drilling fluid to provid... | 04/16/1991 |
| 4633950 | Method for controlling lost circulation of drilling fluids with hydrocarbon absorbent polymers The invention is a method for reducing lost circulation of aqueous or oil based drilling fluids wherein one or more hydrocarbon absorbent polymers are dispersed in an aqueous carrier fluid which is injected into the lost circulation zone. The aqueous carr... | 01/06/1987 |
| 4514308 | Sulfonated asphalt Sulfonated asphalt/hydrogenated conjugated diene-monovinyl aromatic copolymer compositions, preparations thereof, and use in well working fluid compositions.... | 04/30/1985 |
| 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 |
| 4421902 | Alkyl, poly(oxyethylene) poly(carbonyloxyethylene) acrylate emulsion copolymers for thickening purposes There are disclosed polymerizable alkyl poly(oxyethylene) poly(carbonyloxyethylene)acrylates and copolymers thereof, especially stable, aqueous dispersions of water-insoluble emulsion copolymers of (1) about 10-70% by weight of (meth)acrylic, (2) about 0.... | 12/20/1983 |
| 4366074 | Oil well treating method and composition A particular simple method and class of organic polycationic polymer compositions are provided for treating earthen formations such as in oil wells to stabilize clay against dispersion and expansion due to water.... | 12/28/1982 |
| 4269279 | Spheroidal plastic coated magnetizable particles and their use in drilling fluids Plastic coated magnetic particles in bead form are used in drilling fluids to increase the lubricity thereof as indicated by a decrease in the drilling torque or the power required to rotate the drill string. Also provided is a method of recovering the be... | 05/26/1981 |
| 4063603 | Drilling fluid lubricant A method wherein spherical plastic beads are added to a drilling mud to reduce torque and drag on the drill string and to otherwise enable smooth drilling operations downhole by acting as a lubricant between the drill string, drill bit, and the well bore ... | 12/20/1977 |
| 4057683 | Graft copolymer and process for making same A reaction process and product obtained thereby, said process comprising reacting a polymerizable monomeric compound containing a polymerizably reactive vinyl group, such as methyl methacrylate, acrylonitrile, vinyl acetate, or the like, in an aqueous med... | 11/08/1977 |
