Non-retarding fluid loss additives for well cementing compositions

Patent · Tue Jul 29 04:00:00 EDT 1986

OSTI ID:5443116

McKenzie, L F; McElfresh, P M; Reese, D W

A method is described of cementing a well bore, comprising the steps of: mixing together a hydraulic cement, water in an amount to produce a pumpable slurry, and a non-retarding fluid loss additive which comprises a copolymer of N-vinylpyrrolidone monomer and a second anionic monomer selected from the group consisting of acrylic acid and methacrylic acid the monomer ratio of the N-vinylpyrrolidone monomer to the anionic monomer being in the range from about 85:15 to 95:5, and the copolymer having a molecular weight in the range from about 200,000 to 400,000; pumping the cement slurry to the desired location in the well bore; and allowing the cement slurry to harden to a solid mass.

• Assignee: Hughes Tool Co., Houston, TX
• Patent Number(s): US 4602685
• OSTI ID: 5443116
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLIC ACID
ADDITIVES
AMIDES
AZOLES
BUILDING MATERIALS
CARBOXYLIC ACIDS
CEMENTING
CEMENTS
CHEMICAL PREPARATION
COPOLYMERS
DISPERSIONS
HARDENING
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
LACTAMS
MATERIALS
METHACRYLIC ACID
MIXING
MIXTURES
MONOCARBOXYLIC ACIDS
MONOMERS
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
POLYMERS
PUMPING
PYRROLES
PYRROLIDONES
QUANTITY RATIO
SLURRIES
SUSPENSIONS
SYNTHESIS
WATER
WELL COMPLETION
WELLS