Abstract: The disclosure relates to a method of delaying viscosification of a well treatment fluid within a well or within a subterranean formation penetrated by a well by introducing into the well a hydratable viscosifying agent of particulates having a minimum of 40% retention on a 60 mesh screen and a minimum of 1% retention on a 20 mesh screen.

Abstract: The disclosure relates to a method of delaying viscosification of a well treatment fluid within a well or within a subterranean formation penetrated by a well by introducing into the well a hydratable viscosifying agent of particulates having a minimum of 40% retention on a 60 mesh screen and a minimum of 1% retention on a 20 mesh screen.

Abstract: The disclosure relates to a method of delaying viscosification of a well treatment fluid within a well or within a subterranean formation penetrated by a well by introducing into the well a hydratable viscosifying agent of particulates having a minimum of 40% retention on a 60 mesh screen and a minimum of 1% retention on a 20 mesh screen.

Abstract: Various illustrative embodiments of a cement composition for use in subterranean formations are disclosed. The cement composition can comprise water and cement. The cement powder can be mixed with water on-site to create a cement slurry or mixed with water off-site and transported to the well site. The cement composition can be pumped into the subterranean formation and allowed to penetrate the formation. For example, the cement slurry can be pumped into the wellbore, such as into the annulus, to displace fluids in the wellbore and replace them with cement.

Abstract: The disclosure relates to a method of delaying viscosification of a well treatment fluid within a well or within a subterranean formation penetrated by a well by introducing into the well a hydratable viscosifying agent of particulates having a minimum of 40% retention on a 60 mesh screen and a minimum of 1% retention on a 20 mesh screen.

Abstract: Loss of wellbore fluids (such as drilling fluids, completion fluids and workover fluids) into the flow passages of a subterranean formation during well drilling, cementing, completion and workover operations may be reduced or eliminated by introducing into the wellbore in communication with the formation a suspension of a polysaccharide in a aqueous fluid. The aqueous fluid contains water and a delayed viscosification material or agent. Hydration of the polysaccharide may be delayed until after introduction of the composition into the formation. A fluid-impermeable barrier is thereby formed.

Abstract: Loss of wellbore fluids (such as drilling fluids, completion fluids and workover fluids) in a wellbore or into the flow passages of a subterranean formation during well drilling, cementing, completion and workover operations may be reduced or eliminated by introducing into the wellbore a fluid of a hydratable polyvinyl alcohol in an aqueous fluid. The amount of polyvinyl alcohol in the well treatment composition is between from about 50 pounds to about 1,200 pounds per 1,000 gallons of aqueous fluid. The aqueous fluid may contain a delayed viscosification agent and/or crosslinking agent. Alternatively, the polyvinyl alcohol may be greater than or equal to 95 percent hydrolyzed. When introduced into the well, a fluid impermeable barrier is formed within the formation or wellbore.