Cementing composition comprising nonionic hydrophobically-modified cellulose ethers and its use

US9416051B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Roger L. Kuhlman · Lake Jackson, US
• Cole A. Witham · Freeport, US
• Michael K. Poindexter · Sugar Land, US
• Raymond M. Jones · Pearland, US
• Nathan Kyle Combs · Spring, US
• Jeffrey Thomas Watters · Cypress, US
• Larry Watters · Spring, US

Key dates

• Filing date: Dec 6, 2013
• Grant date: Aug 16, 2016
• Expiry date: Dec 6, 2033

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21B33/14
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed is a composition and a method for cementing a casing in a borehole of a well using an aqueous cementing composition comprising (a) water, (b) a cementing composition comprising (i) a hydraulic cement, (ii) a hydrophobically modified polymer, (iii) a dispersant, and optionally (iv) one or more other additives conventionally added to aqueous cementing compositions useful in cementing casings in the borehole of wells. Preferably the hydrophobically modified hydroxyethyl cellulose has an ethylene oxide molar substitution of from 0.5 to 3.5, a hydrophobe degree of substitution of from 0.001 to 0.025, and a weight-average molecular weight of from 500,000 to 4,000,000 Daltons and the dispersant is sulfonated polymer, melamine formaldehyde condensate, a naphthalene formaldehyde condensate, a branched or non-branched polycarboxylate polymer. Preferably, the aqueous cementing composition is pumped downwardly into said casing, pumped upwardly into the annulus surrounding said casing until said aqueous composition fills that portion of the annular space desired to be sealed, and then maintaining said aqueous cementing composition in place until the cement sets.