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| Number | Title | Issue Date |
| 7303014 | Casing strings and methods of using such strings in subterranean cementing operations Improved casing strings, and methods of using improved casing strings in subterranean cementing operations, are provided. An example of an apparatus is a pipe string comprising at least one pipe section and a delivery system of an activator. Another example of an ap... | 12/04/2007 |
| 7270183 | Cementing methods using compressible cement compositions A method of cementing at least two casing strings in a well bore, the method having steps as follows: filling the well bore and the inner diameters of the at least two casing strings with a cement composition, wherein at least a portion of the cement composition is ... | 09/18/2007 |
| 7191834 | Foamed cement compositions and associated methods of use A method of cementing in a subterranean formation that comprises providing a foamed cement composition that comprises water, a cement, a gas, and an additive, the additive comprising an anionic foaming agent and at least one of an anionic foam stabilizer or a Zwitte... | 03/20/2007 |
| 7172022 | Cement compositions containing degradable materials and methods of cementing in subterranean formations The present invention provides cement compositions that include degradable materials, and methods of using such compositions in subterranean cementing operations. An example of a method of the present invention includes: providing a cement composition that includes ... | 02/06/2007 |
| 6893496 | Cement compositions and admixtures therefore Blended cement compositions for mixture with aggregate and water to prepare cementitious products. Such blended cement compositions contain cement, calcined diatomaceous earth, calcined kaolin, fiberous material and reactive vinyl acetate co-polymers, with or withou... | 05/17/2005 |
| 6855201 | Cementing compositions A cement composition is basically comprised of a hydraulic cement, water in an amount sufficient to form a pumpable slurry and a fluid loss control polymer additive comprised of 69 weight % of the calcium salt of 2-acrylamido-2-methyl propane sulfonic acid, 14 weigh... | 02/15/2005 |
| 6663851 | Surface-modified titanium dioxide A product obtained by treating surface-modified, pyrogenically produced titanium dioxide with at least one ammonium-functional silane, such as by spraying the pyrogenically produced titanium dioxide with the at least one silane, alone or in ethanol soluti... | 12/16/2003 |
| 6656265 | Cementation product and use for cementing oil wells or the like The present invention provides a cementing composition for an oil well or the like with porosity of less than 50%, and with a solid phase constituted by 35% to 65% (by volume) hollow microspheres, 20% to 45% Class G Portland cement, and 5% to 25% of Class... | 12/02/2003 |
| 6645289 | Complex admixture and method of cement based materials production The present invention relates to admixtures production and to a method of application of the admixtures in cement and concrete technology. The method allows production of high-strength and high durable cement based systems, as well as cement systems with ... | 11/11/2003 |
| 6619399 | Foamed compositions and methods of use in subterranean zones The current invention provides improved methods and compositions for completing a well bore. In one aspect, the current invention provides a process for preparing a foamed cement composition. The process utilizes air to foam the cement after the air has b... | 09/16/2003 |
| 6547871 | Foamed well cement slurries, additives and methods The present invention provides improved foamed well cement slurries, additives and methods. The foamed well cement slurries are basically comprised of a hydraulic cement, sufficient water to form a pumpable slurry, sufficient gas to form a foam and an eff... | 04/15/2003 |
| 6500252 | High strength foamed well cement compositions and methods High strength foamed well cement compositions and methods of cementing subterranean zones penetrated by well bores are provided. The foamed well cement compositions are basically comprised of a hydraulic cement, hydrophilic fibers, water sufficient to for... | 12/31/2002 |
| 6478868 | Early-enhanced strength cement compositions and methods The present invention provides improved early-enhanced strength cement compositions and methods. The cement compositions can be utilized in surface construction projects as well as in the construction of oil, gas and water wells. The improved cement compo... | 11/12/2002 |
| 6454004 | Cementing casing strings in deep water offshore wells The present invention provides improved compositions and methods for cementing casing strings in deep water offshore formations penetrated by well bores. The methods are basically comprised of the steps of preparing a cement composition comprised of hydra... | 09/24/2002 |
| 6425950 | Method for producing foaming substances, especially foaming cement substances, and corresponding device The invention relates to a method for producing foaming substances, especially foaming cement substances, consisting essentially of a starting product, especially cement paste, and a foaming agent. The inventive substances are produced in a mixing reactor... | 07/30/2002 |
| 6372037 | Set retarders for foamed cements An improved non-dispersing set retarder additive for foamed cements, cement compositions containing the additive, and methods of cementing in a subterranean zone penetrated by a well bore are provided. The set retarder additive includes a blend of a sulfo... | 04/16/2002 |
| 6350309 | Methods and compositions for cementing pipe strings in well bores The present invention provides improved methods and compositions for cementing pipe strings in well bores. The methods of the invention are basically comprised of preparing a cement composition comprised of a hydraulic cement, an epoxy resin, a hardening ... | 02/26/2002 |
| 6336505 | Cementing casing strings in deep water offshore wells The present invention provides improved methods of cementing casing strings in deep water offshore formations penetrated by well bores. The methods are basically comprised of the steps of preparing a cement composition comprised of hydraulic cement, water... | 01/08/2002 |
| 6273191 | Cementing casing strings in deep water offshore wells The present invention provides improved methods of cementing casing strings in deep water offshore formations penetrated by well bores. The methods are basically comprised of the steps of preparing a cement composition having a short transition time compr... | 08/14/2001 |
| 6264739 | Dispersant for plaster An dispersant for plaster comprising a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 2 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acry... | 07/24/2001 |
| 6244343 | Cementing in deep water offshore wells An improved method of cementing casing in a deep water offshore formation penetrated by a well bore comprising the steps of preparing a foamed cement composition comprised of calcium aluminate cement, a set accelerating additive, a thickening time increas... | 06/12/2001 |
| 6227294 | Methods of cementing subterranean zones Improved methods of cementing in a subterranean zone penetrated by a well bore are provided. The methods are basically comprised of the steps of preparing a foamed cement composition comprised of hydraulic cement, a non-dispersing set retarder, sufficient... | 05/08/2001 |
| 6220354 | High strength foamed well cement compositions and methods High strength foamed well cement compositions and methods of cementing subterranean zones penetrated by well bores are provided. The foamed well cement compositions are basically comprised of a hydraulic cement, hydrophilic fibers, water sufficient to for... | 04/24/2001 |
| 6202751 | Methods and compositions for forming permeable cement sand screens in well bores Methods and compositions for forming permeable cement sand screens in well bores are provided. The compositions are basically comprised of a hydraulic cement, an acid soluble particulate solid, a liquid hydrocarbon solvent soluble particulate solid, a par... | 03/20/2001 |
| 6143069 | Light weight high temperature well cement compositions and methods The present invention provides light weight high temperature well cement compositions and methods. The compositions are basically comprised of calcium aluminate, ASTM class F fly ash and water.... | 11/07/2000 |
| 6039800 | Production of foamed compositions containing gypsum Disclosed is a process of making foamed compositions of water, gypsum, and either or both of alpha-olefin sulfonates and/or amphoteric surfactants of formula (a) or (b) R4 --(OC3 H6)0-1 --(C(O)NH(CH2)... | 03/21/2000 |
| 5996693 | Methods and compositions for cementing pipe in well bores Methods and compositions for cementing pipe strings in well bores are provided. The compositions are basically comprised of a hydraulic cement, water, an in situ foam generating additive and a water-wetting foam stabilizing surfactant.... | 12/07/1999 |
| 5942031 | Expanding additive for cement composition Deadburned magnesium oxides (calcined at a temperature of above about 4000° F.) can be advantageously utilized as an expanding additive in cements utilized to seal a metallic casing into the bore hole of a well. The deadburned magnesium oxide additives a... | 08/24/1999 |
| 5900053 | Light weight high temperature well cement compositions and methods The present invention provides light weight high temperature well cement compositions and methods. The compositions are basically comprised of calcium phosphate cement, water, a foaming agent, a foam stabilizer and a gas present in an amount sufficient to... | 05/04/1999 |
| 5897699 | Foamed well cement compositions, additives and methods The present invention relates to improved foamed well cement compositions, additives and methods. The additives, which foam and stabilize a cement slurry containing freshwater or saltwater, are basically comprised of an aqueous solution of an alpha-olefin... | 04/27/1999 |
| 5846316 | Shrinkage-compensating concrete A shrinkage compensating cement exceeding the ASTM standard specification limiting 28 day expansion to 115% of the 7 day expansion. 28 day expansions of 120-200% are contemplated. The expansion takes place over an extended period of time, to better offset... | 12/08/1998 |
| 5820670 | Resilient well cement compositions and methods The present invention provides resilient cement compositions and methods which are particularly useful in the construction and repair of oil and gas wells. The cement compositions have improved mechanical properties including elasticity and ductility.... | 10/13/1998 |
| 5806594 | Compositions and methods for cementing a well Foamed cement slurry compositions and a process or method for cementing well casings or pipes utilizing such compositions are described, the compositions being characterized by critical ratios of particular solid and liquid components. The slurry composit... | 09/15/1998 |
| 5788761 | Process for the manufacture of construction materials A process in which the conventional sulfate components in an aerated concrete mixture, such as gypsum, semihydrate or anhydrite, are replaced at least in part by calcium aluminum sulfates and/or calcium aluminate sulfate hydrates. As a result, agglomerati... | 08/04/1998 |
| 5753368 | Fibers having enhanced concrete bonding strength The bonding between concrete and fibers is enhanced by using a fiber coating material selected from certain glycol ethers, having at least three carbon atoms in an oxyalkylene group, and glycerol ethers. The present invention pertains to such coated fiber... | 05/19/1998 |
| 5728209 | Unitized cement admixture An additive for concrete, mortar or grout comprises at least one admixture material in a compacted unit of selected amount, the unit having strength sufficient to maintain structural integrity during handling and storage, but having sufficient solubility ... | 03/17/1998 |
| 5690729 | Cement mixtures with alkali-intolerant matter and method A method of reinforcing cement/concrete mixtures with alkali-intolerant reinforcements and/or aggregate, such as uncoated, common glass filament, plastic filament, fabric and roving made therefrom by reducing the pH of the mixture while in its plastic sta... | 11/25/1997 |
| 5641535 | Process for the microencapsulation of water-emulsifiable non-thermoplastic substances The invention relates to a process for the preparation of microencapsulated flakes or powders by drying aqueous mixtures containing (a) one or more water-emulsifiable, non-thermoplastic compounds which have a higher boiling point than water and (b) at lea... | 06/24/1997 |
| 5641352 | Nitrogenous strength enhancers for portland cement An early strength-enhancing admixture and cement composition is disclosed. The admixtures incorporate strength-enhancing components selected from the group consisting of a. a nitrogenous compound of the formula ##STR1## wherein R1 =R5... | 06/24/1997 |
| 5635292 | Compressed low density hydraulically bonded composite articles Incorporation of solid removable aggregates into powdered cement which later completely dissolve, evaporate, volatilize, or melt leaving voids in the cement composition is discussed. Cementitious articles are prepared by manipulating powdered hydraulic ce... | 06/03/1997 |
