Wellbore fluid

摘要

The present invention provides a wellbore fluid, such as a drilling, completion or workover fluid, said wellbore fluid comprising a glucomannan additive. Further provided is a method of forming a gel plug from the wellbore fluid, a method of modifying the properties of a wellbore fluid, a method of drilling a subterranean hole with such a fluid and the use of glucomannan in wellbore fluids.

主权项

1. A wellbore fluid comprising:
water; a glucomannan additive, wherein the glucomannan additive has at least an acetyl group; and at least one other component selected from the group consisting of a rheology modifier, fluid loss control agent, inorganic or organic salt, dispersant, shale stabilizer or inhibitor, and weighting agent; and further wherein the wellbore fluid does not comprise a crosslinking agent; wherein the glucomannan additive forms a gel after deacetylation of the at least an acetyl group under alkaline conditions.