Spacer Fluid Additive
AssigneeSchlumberger Technology Corporation
InventorBruno Drochon
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Abstract
A spacer fluid comprises a fluid and a viscosity agent. The viscosity agent is a mixture of at least two polyvinylalcohol compositions. A first polyvinylalcohol composition comprises polyvinylalcohols having a first degree of hydrolysis and a second polyvinylalcohol composition comprises polyvinylalcohols having a second degree of hydrolysis. The first and second degrees of hydrolysis are substantially different such that the rheology of the spacer fluid is stable during temperatures changes.
Claims11
A spacer fluid comprising a fluid and a viscosity agent wherein the viscosity agent is a mixture of at least two polyvinyl alcohol compositions including a first polyvinyl alcohol composition comprising polyvinyl alcohols having a first degree of hydrolysis and a second polyvinyl alcohol composition comprising polyvinyl alcohols having a second degree of hydrolysis, wherein the first and second degrees of hydrolysis are substantially different such that rheological properties of the spacer fluid are stable during temperature changes.
A method for displacing drilling fluid from a well comprising:
- displacing the drilling fluid with a spacer fluid comprising a fluid and a viscosity agent wherein the viscosity agent is a mixture of at least two polyvinyl alcohol compositions including a first polyvinyl alcohol composition comprising polyvinyl alcohols having a first degree of hydrolysis and a second polyvinyl alcohol composition comprising polyvinyl alcohols having a second degree of hydrolysis, wherein the first and second degrees of hydrolysis are substantially different such that rheological properties of the spacer fluid are stable during temperature changes.
Dependencies are inferred from the claim text.