Fluid loss control additives for oil well cementing compositions

Patent · Tue Mar 03 04:00:00 EST 1992

OSTI ID:5356145

Crema, S C; Kucera, C H

This patent describes a cementing composition useful in cementing oil, gas and water wells. It comprises hydraulic cement; and a fluid loss additive in an amount effective to reduce fluid loss, the fluid loss additive comprised of a copolymer of acrylamide monomer and vinyl formamide monomer and derivatives thereof in a weight percent ratio of from about 95:5 to 5:95, the copolymer having a molecular weight range of from about 10,000 to 3,000,000, the acrylamide monomer being selected from the group consisting of acrylamide, methacrylamide, N,N-dimethyl(meth)acrylamide, dialkylaminoalkyl(meth) acrylamide and mixtures thereof, the vinyl formamide monomer being selected from the group consisting of vinyl formamide, its hydrolysis products and derivatives thereof.

• Assignee: BASF Corp., Parsippany, NJ (United States)
• Patent Number(s): A; US 5092935
• Application Number: PPN: US 7-484324
• OSTI ID: 5356145
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
023000 -- Petroleum-- Properties & Composition
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADDITIVES
CEMENTING
CHEMICAL COMPOSITION
CONTROL SYSTEMS
DRILLING FLUIDS
FLUIDS
NATURAL GAS WELLS
OIL WELLS
PRESSURE DROP
WELL COMPLETION
WELLS