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| Number | Title | Issue Date |
| 7351764 | Methods to enhance brightness of pulp and optimize use of bleaching chemicals Mechanical or Chemical pulp is treated with about 0.01 weight % to about 5 weight % of a Mixture. The Mixture is water; diethylenetriaminepentakis(methyl)phosphonic acid or its known salts; polyacrylic acid or its known salts; and optionally one or more inert compou... | 04/01/2008 |
| 7351680 | High performance water-based mud system A drilling fluid or mud additive having several components, including leonardite (humic acid); potassium acetate; partially hydrolyzed polyacrylamide (PHPA); polyanionic cellulose polymer (PAC); sulfonated asphalt; sulfoalkylated tannin; polystyrene maleic anhydride... | 04/01/2008 |
| 7285164 | Fluid loss additives for cement slurries Methods for cementing in a subterranean zone, which use a cement composition that includes zeolite, cementitious material, proportioned fluid loss control additives and a mixing fluid. Cement compositions containing proportioned fluid loss control additives, and met... | 10/23/2007 |
| 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 |
| 7140440 | Fluid loss additives for cement slurries Methods for cementing in a subterranean zone, which use a cement composition that includes zeolite, cementitious material, proportioned fluid loss control additives and a mixing fluid. Cement compositions containing proportioned fluid loss control additives, and met... | 11/28/2006 |
| 7140439 | Zeolite-containing remedial compositions Methods and compositions for wellbore treating fluids, especially remedial compositions such as pills, that include zeolite and at least one carrier fluid. ... | 11/28/2006 |
| 6997270 | Compounds and method for generating a highly efficient membrane in water-based drilling fluids A method is disclosed that affords improved stability to wellbores during drilling in argillaceous formations with water-based drilling fluids. The method comprises adding to the drilling fluid a compound of the invention having the capacity in water to generate a h... | 02/14/2006 |
| 6216361 | Dehydration of drilling mud There is provided an improved method for removing water from oil based drilling fluids used in the drilling of boreholes through the ground wherein MgSO4 (magnesium sulfate) is added to the drilling fluid to scavenge the water therefrom.... | 04/17/2001 |
| 5663122 | Mineral additives for setting and/or controlling the rheological properties and gel structure of aqueous liquid phases and the use of such additives The invention concerns the use of mixed hydroxydes of bivalent and trivalent metals with a three-dimensional spaced-lattice structure of the garnet type to control the thixotropic thickening of aqueous preparations, using swellable clays and/or other swel... | 09/02/1997 |
| 5656070 | Corrosion inhibiting compositions containing plant derived catechol complexes Corrosion inhibiting composition include the use of certain plant derived catechol complexes in aqueous based compositions, such as process water, and other aqueous and non-aqueous solvent based coating compositions. The compositions have corrosion inhibi... | 08/12/1997 |
| 5610124 | Tin/cerium compounds for lignosulfonate processing This invention concerns tin-, cerium-, and base-treated tin-bearing lignosulfonates, a process for their preparation from calcium lignosulfonate, and a process for the use thereof as drilling fluid additives.... | 03/11/1997 |
| 5424283 | Drilling muds effective at high temperature Aqueous drilling muds effective at high temperature containing complexes, preformed or formed in situ, of tetravalent zirconium with one or more organic acids, or relative salts, of general formula (I) ##STR1## where R1 and R2, ... | 06/13/1995 |
| 5401718 | Tin/cerium compounds for lignosulfonate processing This invention concerns tin-, cerium-, and base-treated tin-bearing lignosulfonates, a process for their preparation from calcium lignosulfonate, and a process for the use thereof as drilling fluid additives.... | 03/28/1995 |
| 5399548 | Blended drilling fluid thinner A blended additive composition, which is useful for thinning aqueous drilling fluids, is disclosed. The composition includes a first component selected from the group including: a modified tannin, a modified lignite and sodium lignosulfonate; a second com... | 03/21/1995 |
| 5124312 | Drilling fluid thinners The present invention relates to drilling fluid additives, more particularly to superior drilling fluid thinners or polyfunctional drilling fluid conditioners, and methods of their preparation. The thinners comprise chelates and complexes prepared by reac... | 06/23/1992 |
| 5094778 | Mixed metal hydroxide containing a dispersant Novel compositions useful as fluid gelling agents, especially for use in subterranean applications such as drilling fluids, are prepared by reacting an aqueous dispersion of a clay, such as bentonite, with an aqueous gel of a monodispersed mixed metal lay... | 03/10/1992 |
| 4990268 | Mixed metal hydroxides for thickening water or hydrophylic fluids Novel monodispersed crystalline mixed metal layered hydroxide compounds of the general formula are prepared: Lim Dd T(OH).sub.(m+2d+3+na) Aan, where m is an amount from zero to 1; D is a divalent metal; d is the amo... | 02/05/1991 |
| 4921620 | Chrome humates as drilling mud additives The disclosure is of the use of chrome humate derivatives to reduce the viscosity of and/or to prevent fluid loss in water-based drilling fluids. The composition is much more effective as a drilling mud thinner, and as a fluid loss control agent than the ... | 05/01/1990 |
| 4842770 | Drilling fluid thinner An improved aqueous drilling fluid additive comprising chromium acetate and sulfoalkylated tannins optionally in combination with lignite.... | 06/27/1989 |
| 4790954 | Mixed metal hydroxide-clay adducts as thickeners for water and other hydrophylic fluids Novel compositions useful as fluid gelling agents, especially for use in subterranean applications such as drilling fluids, are prepared by reacting an aqueous dispersion of a clay, such as bentonite, with an aqueous gel of a monodispersed mixed metal lay... | 12/13/1988 |
| 4755307 | Process for making drilling fluid additives containing lignosulfonates An improved process for making drilling fluid additives. The drilling fluid additives generally comprise titanium and/or zirconium lignosulfonates. The improved process of this invention can be performed without any delays caused by plugging during filtra... | 07/05/1988 |
| 4728727 | Modified lignosulfonate drilling fluid dispersants and process for the preparation thereof The present invention relates to modified lignosulfonate materials and the process for their preparation. These modified lignosulfonates result from the sulfonation of ultrafiltered lignosulfonates by reaction with sulfite-bisulfite salts. The removal of ... | 03/01/1988 |
| 4719021 | Shale-stabilizing drilling fluids and method for producing same Shale-stabilizing drilling fluids for use in connection with subterranean well drilling operations. The drilling fluids contain polyvalent metal/guanidine complexes, especially aluminum/guanidine complexes, and preferably contain guanidinium ion and alumi... | 01/12/1988 |
| 4704214 | Drilling fluid In an aqueous drilling fluid, an improved thinning effect is obtained by adding a first agent comprising a mixture of a sulfoalkylated tannin or polyvalent metal complex thereof with a lignite, optionally in combination with a second agent comprising a me... | 11/03/1987 |
| 4664843 | Mixed metal layered hydroxide-clay adducts as thickeners for water and other hydrophylic fluids Novel compositions useful as fluid gelling agents, especially for use in subterranean applications such as drilling fluids, are prepared by reacting an aqueous dispersion of a clay, such as bentonite, with an aqueous gel of a monodispersed mixed metal lay... | 05/12/1987 |
| 4618433 | Drilling fluids and thinners therefor In an aqueous drilling fluid, an improved thinning effect is obtained by adding a first agent comprising a sulfoalkylated tannin or heavy metal complex thereof, optionally in combination with a lignite, and a second agent comprising a metal compound conta... | 10/21/1986 |
| 4594169 | Drilling fluid additives Drilling fluid additives are prepared by complexing humic acids and/or lignins, with three compounds of zirconium, nickel and iron. The metal composition of the additives is 1.3 to 2.5% of zirconium, 0.8 to 1.5% of nickel and 0.8 to 1.5% of iron, and is t... | 06/10/1986 |
| 4505825 | Oil well drilling clay conditioner A high quality chrome lignosulfonate for use as an oil well drilling additive is produced from molecular weight and/or high carbohydrate containing spent sulfite liquor. The additive is obtained by adding boron prior to the oxidation of the lignosulfonate... | 03/19/1985 |
| 4500436 | Saltwater and hard water bentonite mud A seawater/saltwater or hard water bentonite mud for use in drilling, and process for preparing same, comprising sequentially adding to seawater, to saltwater of a chloride concentration up to saturation, or hard water: (1) a caustic agent; (2) a filtrati... | 02/19/1985 |
| 4457853 | Oil well drilling clay conditioners and method of their preparation Improved drilling fluid additives or conditioners are obtained by oxidation of sulfonated lignin-containing materials with manganese dioxide and boron addition either before or after the oxidation step. The resulting manganese-boron lignosulfonates are mo... | 07/03/1984 |
| 4447339 | Oil well drilling clay conditioners and method of their preparation Drilling fluid additives are prepared by oxidation of sulfonated lignin-containing materials with manganese dioxide under highly acidic conditions to make manganese lignosulfonates. Additional improvements in the rheological properties of the additives ma... | 05/08/1984 |
| 4421655 | Organophilic polyphenolic acid additives for well-working compositions The invention provides novel organophilic derivatives of polyphenolic compounds which are readily soluble and/or dispersible in hydrocarbons to prepare oil base well-working compositions having a low filter loss. These fluid loss additives are obtained by... | 12/20/1983 |
| 4420405 | Water based drilling mud additive A water based fluid additive useful in drilling mud used during drilling of an oil or gas well is disclosed, produced by reacting water at temperatures between 210°-280° F. with a mixture comprising in percent by weight: and then removing substantially ... | 12/13/1983 |
| 4341645 | Aqueous drilling and packer fluids Aqueous, clay-containing drilling fluids and packer fluids are modified for reduction of viscosity and gel strength upon addition of water soluble lignosulfonates and particular low molecular weight acrylic copolymers. Enhanced reduction of viscosity and ... | 07/27/1982 |
| 4322301 | Drilling fluid composition A water-based drilling fluid composition is described which comprises an aqueous dispersion of a clay material containing, in the presence of a phosphate or a particular metal or both, an effective dispersing amount of a lignosulfonate modified by graft p... | 03/30/1982 |
| 4220585 | Drilling fluid additives A drilling fluid additive effective as a viscosity controlling agent is composed of complex titanium or zirconium lignosulfonates and/or salts of lignosulfonic acid. Alternatively, the additive may be a titanium-iron lignosulfonate and/or salt or lignosul... | 09/02/1980 |
| 4213762 | Determination of chromate ion in drilling mud filtrates A method of determining the amount of chromate ion in drilling and mud filtrates containing lignosulfonates is disclosed. Briefly, the method comprises: (a) treating the filtrate with an effective amount of hydrogen peroxide to destroy any color bodies co... | 07/22/1980 |
| 4209409 | Drilling fluid additives The addition of magnesium oxide to a drilling fluid additive comprising bentonite and ferrochrome lignosulfonate, the drilling fluid additive having a pH of about 9.5 to 12, increases the usefulness of such a drilling fluid additive and increases consider... | 06/24/1980 |
| 4181533 | Well cementing in permafrost A process for cementing a string of pipe in the permafrost region of a borehole of a well wherein aqueous drilling fluid actually used in drilling the wellbore in the permafrost region of a wellbore is employed. The drilling fluid contains or is adjusted ... | 01/01/1980 |
| 4175042 | Well completion and work over fluid and method of use A nondamaging work over and completion fluid having water soluble bridging agents includes a saturated brine solution having at least one water soluble salt which is insoluble in the saturated brine solution and having particle size range of about 5 micro... | 11/20/1979 |
