Compressed lost circulation materials for use in subterranean formations are provided. In some embodiments, the methods include: introducing a treatment fluid that includes a base fluid and a compressed lost circulation material into a wellbore penetrating at least a portion of a subterranean formation including a loss zone, the compressed lost circulation material including a binding material and a compressed material; allowing the binding material to at least partially degrade or dissolve; and allowing the compressed lost circulation material to at least partially expand in the subterranean formation.

A wellbore fluid may include an oleaginous fluid forming a continuous phase; a non-oleaginous fluid forming a discontinuous phase; at least one emulsifier stabilizing an emulsion of the non-oleaginous continuous phase within the oleaginous continuous phase; and at least one viscosifier dispersed into the oleaginous continuous phase in a concentration of at least 4 ppb; wherein upon subjecting the wellbore fluid to shear rate of at least 10,000 s-1, the emulsion is disrupted and the non-oleaginous fluid contacts the at least one viscosifier, thereby solidifying the wellbore fluid.

Insulating fluids for use in drilling, production, and other applications are provided, the insulating fluids containing a porous medium (such as a sponge or foam) to limit the mobility of the liquid phase of the insulating fluid. The porous medium in the insulating fluid provides a mechanical means for reducing convective heat transfer, as the small pore spaces within the porous media create tortuous paths for the liquid moving therethrough. Methods include introducing the insulating fluid into an annulus of a drilling, riser, production, packer, or pipeline assembly to reduce heat transfer therethrough.

Insulating fluids for use in drilling, production, and other applications are provided, the insulating fluids containing a porous medium (such as a sponge or foam) to limit the mobility of the liquid phase of the insulating fluid. The porous medium in the insulating fluid provides a mechanical means for reducing convective heat transfer, as the small pore spaces within the porous media create tortuous paths for the liquid moving therethrough. Methods include introducing the insulating fluid into an annulus of a drilling, riser, production, packer, or pipeline assembly to reduce heat transfer therethrough.

A silane-modified colloidal silica in the form of a Pickering emulsion and a method for enhancing recovery of hydrocarbons and improving conformance using it. When injected into an oil well, the silane-modified colloidal silica separates into an aqueous phase and oil/oleic phase. The aqueous phase forms a gel that blocks the flow of water and the oleic phase that forms permits oil to flow out of the well.

Compositions with modified tannins can be used in wellbore operations. A composition can include an oil, a modified tannin, a dimer fatty acid, an aqueous liquid, and an emulsifier, where the material is injectable into a wellbore. The modified tannin may be treated with a primary amine, secondary amine, tertiary amine, or quaternary amine. The compositions may be used as drilling fluids having enhanced yield point and fluid loss control properties.

Compositions with modified tannins can be used in wellbore operations. A composition can include an oil, a modified tannin, a dimer fatty acid, an aqueous liquid, and an emulsifier, where the material is injectable into a wellbore. The modified tannin may be treated with a primary amine, secondary amine, tertiary amine, or quaternary amine. The compositions may be used as drilling fluids having enhanced yield point and fluid loss control properties.

A method for reducing lost circulation in a subterranean formation. The method includes providing a treatment fluid comprising a base fluid and a lost circulation material comprising cane ash. The treatment fluid is introduced into a wellbore within the subterranean formation such that at least a portion of the cane ash bridges openings in the subterranean formation to reduce loss of fluid circulation into the subterranean formation.

A method for reducing lost circulation in a subterranean formation. The method includes providing a treatment fluid comprising a base fluid and a lost circulation material comprising brown mud. The treatment fluid is introduced into a wellbore within the subterranean formation such that at least a portion of the brown mud bridges openings in the subterranean formation to reduce loss of fluid circulation into the subterranean formation.

Certain invert emulsion treatment fluids for use in subterranean formations are provided. In certain embodiments, the methods comprise: providing an invert emulsion treatment fluid that comprises an oleaginous external phase, and an internal phase that comprises one or more alcohols and one or more polar organic compounds that are soluble in the internal phase; and introducing the treatment fluid into at least a portion of a subterranean formation.