Patent application number | Description | Published |
20090107677 | Sealant Composition - A sealant composition for use in subterranean wells comprising an alkali metal silicate and a calcium containing inorganic compound wherein the particles of the calcium containing compound have a mean particle size that is submicron. | 04-30-2009 |
20090183876 | Control of the Properties of Cement Slurries With Optimized Polymers Combination - The invention discloses a cement slurry composition for cementing a well comprising: an hydraulic cement, water and a combination made of a hydroxyethyl cellulose and an acrylamido-methyl-propane sulfonate-acrylamide copolymer. | 07-23-2009 |
20100004351 | Fluid Loss Control Agents and Compositions for Cementing Oil and Gas Wells Comprising said Fluid Loss Control Agent - It is proposed a new fluid loss control agent useful for the cementation of oil or gas wells. This fluid loss control agent consists of a mixture of a styrene-butadiene latex and a high molecular weight water-soluble polymer such as a copolymer AMPS-Am. The addition of the water-soluble polymer allows drastic reduction of the quantity of latex required to achieve fluid loss control performance and even gas migration control. | 01-07-2010 |
20100168273 | CEMENT RETARDER SYSTEMS, AND RETARDED CEMENT COMPOSITIONS - A cement retarder system for use in underground wells included a borate compound, an organophosphonate salt, and a copolymer formed from AMPS and a monomer selected from the group consisting of acrylic acid, acrylamide and mixtures thereof. A method of using the retarder system in an underground well having a borehole drilled therein with a borehole wall, and further including a casing disposed in said borehole, such that an annulus exists between said casing and said borehole wall, comprising the steps of providing a cement composition and a liquid carrier, providing a retarder system for said cement composition comprising a borate compound, an organophosphonate salt, and a copolymer formed from AMPS and a monomer selected from the group consisting of acrylic acid, acrylamide, and mixtures thereof, mixing a sufficient amount of said retarder system to create a desired induction period with said cement composition and said liquid carrier to form a cement slurry, pumping the cement slurry from the surface down the casing, and causing said slurry to return to the surface in the annulus between the casing and the borehole wall. | 07-01-2010 |
20100258310 | COMPOSITIONS AND METHODS FOR SERVICING SUBTERRANEAN WELLS - This invention relates to methods for servicing subterranean wells, in particular, fluid compositions and methods for remedial operations during which the fluid compositions are pumped into a wellbore and make contact with well cements placed during primary cementing or previous remedial cementing operations. | 10-14-2010 |
20110077175 | Sealant Composition - A sealant composition for use in subterranean wells comprising an alkali metal silicate and a calcium containing inorganic compound wherein the particles of the calcium containing compound have a mean particle size that is submicron. | 03-31-2011 |
20110108274 | ADDITIVE FOR WELL CEMENTING APPLICATIONS - An additive for Portland-cement slurries comprises a liquid silicate absorbed into a solid porous medium. The additive is incorporated in slurries designed for well-cementing applications. The liquid silicate functions as a retarder aid and dispersant when added to slurries for use at temperatures above about 85° C. The resulting solid product allows use of the liquid silicate in well-cementing operations as if it were a dry additive. | 05-12-2011 |
20120145387 | Compositions and Methods for Servicing Subterranean Wells - Disclosed are pumpable-fluid compositions and methods for establishing hydraulic isolation in cemented subterranean wells. The fluid compositions comprise solids-free solutions of water-soluble polymers. Upon entering voids and cracks in the cement sheath and contacting the set-cement surfaces, the fluid gels and forms a seal that prevents further leakage. | 06-14-2012 |
20120152541 | Compositions and Methods for Well Completions - Well-cementing compositions for use in high-pressure, high-temperature (HPHT) wells are often densified, and contain weighting agents such as hematite, ilmenite, barite and hausmannite. The weighting agents are usually finely divided to help keep them suspended in the cement slurry. At high temperatures, finely divided weighting agents based on metal oxides react with the calcium-silicate-hydrate binder in set Portland cement, leading to cement deterioration. Finely divided weighting agents based on metal sulfates are inert with respect to calcium silicate hydrate; consequently, set-cement stability is preserved. | 06-21-2012 |
20120175119 | Method for Servicing Subterranean Wells - The present invention provides means to seal voids and cracks in subterranean-formation rock that contains carbonate minerals, thereby minimizing or stopping fluid flow between the formation rock and the wellbore of a subterranean well. The methods comprise pumping a solution of one or more lattices that contain at least one carboxylated monomer down a well and allowing it to enter voids (e.g., pores, fractures, vugs and caverns) in the carbonate-containing formation, whereupon it reacts with divalent cations liberated by the carbonates and forms a gel. | 07-12-2012 |
20120312535 | Cementing Composition Comprising within Un-Reacted Cement - The invention provides a cementing composition for use in oilfield application, wherein a significant amount of cement is left intentionally un-hydrated when the cement is set; such that said amount of un-hydrated cement becomes hydrated when the set cement is damaged. | 12-13-2012 |
20130255948 | Compositions and Methods for Well Completions - Well-cementing compositions for use in high-pressure, high-temperature (HPHT) wells are often densified, and contain weighting agents such as hematite, ilmenite, barite and hausmannite. The weighting agents are usually finely divided to help keep them suspended in the cement slurry. At high temperatures, finely divided weighting agents based on metal oxides react with the calcium-silicate-hydrate binder in set Portland, cement, leading to cement deterioration. Finely divided weighting agents based on metal sulfates are inert with respect to calcium silicate hydrate; consequently, set-cement stability is preserved. | 10-03-2013 |
20130269940 | Retarded Cement Compositions and Methods for Well Completions - Cement retarders are based on blends of lignosulfonate compounds, borate compounds and gluconate compounds. The compounds are present in certain ratios that allow the retarders to operate at temperatures and pressures up to and exceeding about 176° C. and 152 MPa. The retarders may also be provided in liquid form, improving their suitability for use at offshore well-site locations. | 10-17-2013 |
20140367103 | Compositions and Methods for Completing Subterranean Wells - Spacer fluids that are stable at temperatures up to at least 260° C. comprise water, polystyrene sulfonate and a mixture of particulate materials. The particulate materials may be chosen such that the mixture has at least a trimodal particle-size distribution. The fluids may further comprise inorganic clays, mutual solvents and surfactants. | 12-18-2014 |
20140367104 | Compositions and Methods for Completing Subterranean Wells - High-specific-gravity micronized particulates, added to cement slurries in conjunction with certain high-molecular-weight water-soluble polymers, improve fluid-loss control of cement slurries during placement in subterranean wells. The particulates may have a specific gravity higher than 3, and a median particle size smaller than 3 μm. The particulates may include barite, manganese tetraoxide, titanium oxide, iron titanium oxide and aluminum oxide. | 12-18-2014 |
20150068428 | Compositions and Methods for Servicing Subterranean Wells - This invention relates to methods for servicing subterranean wells, in particular, fluid compositions and methods for remedial operations during which the fluid compositions are pumped into a wellbore and make contact with well cements placed during primary cementing or previous remedial cementing operations. | 03-12-2015 |