摘要:
Modifizierte Melasse wird als Dispergiernnittel für mineralische Suspensionen verwendet, wobei die modifizierte Melasse erhältlich ist durch ein Verfahren umfassend die Schritte: a) Invertieren von Melasse und/oder bereitstellen von invertierter Melasse b) Umsetzung der invertierten Melasse mit Alkalien.
摘要:
Methods and systems directed to controlling the rheology of settable compositions in subterranean formations. Embodiments include a method of controlling the rheology of a set-delayed cement composition, the method comprising: providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder; shearing the set-delayed cement composition in an amount sufficient to substantially prevent solids settling; storing the set-delayed cement in a pumpable fluid state for at least 1 day; activating the set-delayed cement composition; introducing the set-delayed cement composition into a subterranean formation; and allowing the set-delayed cement composition to set in the subterranean formation. Additional methods and systems are also provided.
摘要:
A variety of methods and compositions are disclosed, including, in one embodiment, a method of cementing in a subterranean formation, comprising: providing a set-delayed cement composition comprising water, pumice, hydrated lime, and a set retarder; activating the set-delayed cement composition; introducing the set-delayed cement composition into a subterranean formation; and allowing the set-delayed cement composition to set in the subterranean formation.
摘要:
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.
摘要:
Disclosed is a composition and a method for cementing a casing in a borehole of a well using an aqueous cementing composition comprising (a) water, (b) a cementing composition comprising (i) a hydraulic cement, (ii) an anionically- and hydrophobically- modified polymer, (iii) a dispersant, and optionally (iv) one or more other additives conventionally added to aqueous cementing compositions useful in cementing casings in the borehole of wells. Preferably the anionically- and hydrophobically-modified hydroxyethyl cellulose has an ethylene oxide molar substitution of from 0.5 to 3.5, a hydrophobe degree of substitution of from 0.001 to 0.025, an anionic degree of substitution of from 0.001 to 1, and a weight-average molecular weight of from 100,000 to 4,000,000 Daltons and the dispersant is sulfonated polymer, melamine formaldehyde condensate, a naphthalene formaldehyde condensate, a branched or non-branched polycarboxylate polymer. Preferably, the aqueous cementing composition is pumped downwardly into said casing, pumping upwardly into the annulus surrounding said casing until said aqueous composition fills that portion of the annular space desired to be sealed, and then maintaining said aqueous cementing composition in place until the cement sets.
摘要:
The present disclosure relates to a gypsum-based composition for construction work, material, or system. The composition comprises of plaster, lightweight aggregate, and pozzolanic materials. The composition can further comprise of filler, additives selected from a group of retarders, superplasticizers, water retaining agents, foaming agents, air entraining agents, or activators at the suitable ratio to obtain a gypsum-based composition for construction. The present disclosure has an advantage especially for a wall system having plaster slurry filling in the gap of the wall system. Such advantage includes a reduction of excess water from plaster reaction, resulting in solving humid surface, paint wear off problems and delay or reduction of corrosion of metal structure due to long contact with excess water. Additionally, a wall system having gypsum-based composition has heat insulation and flame retardant properties.
摘要:
Compositions and methods for reducing the impact of hard water on gypsum board foaming are provided The compositions include adding a foam to water and a calcined slurry The foam includes water, dispersed air and a surfactant Surfactants for use include a hydrophobic portion having an alkyl chain length distribution of about 20% to about 60% C8 chains, about 20% to about 60% C10 chains, about 14% to about 36% C12 chains and about 2% to about 20% C14 chains and also having a hydrophilic portion having about 0.2 to 3 0 ethoxy groups.
摘要:
Methods and compositions are provided for treating fluids, especially spacer fluids and cement compositions as well as drilling, completion and stimulation fluids including, but not limited to, drilling muds, well cleanup fluids, workover fluids, conformance fluids, gravel pack fluids, acidizing fluids, fracturing fluids and the like for introduction into a subterranean zone penetrated by a wellbore, wherein the treating fluid comprises zeolite and a carrier fluid. The treating fluid may additionally include one or more of a viscosifier, organic polymer, dispersants, surfactants and weighting materials.