Pumice-containing remedial compositions and methods of use

摘要

Methods and compositions are provided that utilize pumice and various additives. An embodiment provides a method of remedial cementing in a subterranean formation comprising: providing a lightweight settable composition comprising pumice, a calcium activator, and water, wherein the lightweight settable composition has a density of less than about 13.5 pounds per gallon and is free of Portland cement; and using the lightweight settable composition in a remedial cementing method to seal one or more voids in a well bore. Also provided are pumice-containing remedial compositions and systems for remedial cementing.

主权项

1. A method of remedial cementing in a subterranean formation comprising:
providing a lightweight settable composition comprising pumice, a calcium activator, and water, wherein the lightweight settable composition has a density of less than about 13.5 pounds per gallon and is essentially free of any additional cementitious components, wherein the water is present in an amount in a range of from about 40% to about 200% by weight of the pumice, wherein the lightweight settable composition is foamed with a foaming additive and a gas; and placing the lightweight settable composition into a void or crack in the subterranean formation, a gravel pack, a conduit, a cement sheath, or a microannulus.