Abstract:
Methods for adjusting the mechanical properties of cement systems include preparing a cement slurry containing water, an inorganic cement and at least two minerals. At least one of the minerals has a specific gravity higher than that of the cement at least one of the minerals has a specific gravity lower than that of the cement The slurry is allowed to harden and form a set cement. The concentrations of the cement and the minerals may be varied such that the slurry has a constant solid volume fraction and a constant slurry density.
Abstract:
Well cementing compositions include an aqueous fluid, portland cement, and an air entrainment suppressing agent. The air entrainment suppressing agent includes a blend of a silicone and polypropylene glycol, or a silicone that is functionalized with ether groups. Methods for preparing well cementing compositions comprise adding the air entrainment suppressing agent to the aqueous fluid, and combining the mixing fluid to a solid blend comprising portland cement and hydrophobic particles in a continuous process.
Abstract:
A method of cementing in a subterranean formation comprises: introducing a cement composition into a wellbore penetrating the subterranean formation, wherein at least a portion of the subterranean formation has a temperature less than or equal to the freezing point of an aqueous liquid, and wherein the cement composition comprises: (A) cement; (B) water; and (C) a pozzolan, wherein the cement composition has a heat of hydration of less than 50 BTU per pound; and causing or allowing the cement composition to set in the wellbore after the step of introducing. The pozzolan can have a calcium oxide concentration of less than 15% by weight of the pozzolan, and the pozzolan can have a concentration of at least 15% by weight of the cement. Gas hydrates can be present in or adjacent to a portion of the well.
Abstract:
The present invention comprises a viscosifier for oil well fluids, said viscosifier comprising a cross-linked micro- or nano-fibrillated cellulose (MFC).
Abstract:
The present invention relates to a catalyst composition consisting of ammonium chloride, aluminum chloride, and magnesium oxide and uses thereof. Moreover, the invention relates to a method for obtaining a catalyst composition for reinforcing cement, comprising a combination of a) ammonium chloride and optionally one or more additional chlorides, selected from the group consisting of: sodium chloride, potassium chloride, magnesium chloride, calcium chloride, strontium chloride, and barium chloride; b) aluminum chloride, and c) magnesium oxide and optionallyone or more other metal oxides, preferably selected from the group consisting of: oxides from metals from Group II of the Periodic Table, oxides from metals from Group VIII B of the Periodic Table (e.g. iron oxide), more preferably oxides from metals from Group II of the Periodic Table, even more preferably calciumoxide; by firstly combining ammonium chloride, aluminum chloride, and magnesium oxide to form the catalytic composition and thenadding the remaining additives.