Fluid loss control additives for oil well cementing compositions

Patent · Tue Jul 20 04:00:00 EDT 1993

OSTI ID:6130934

Crema, S C; Kucera, C H; Konrad, G; Hartmann, H

A cementing composition is described useful in cementing oil, gas and water wells comprising: (a) water; (b) hydraulic cement; and (c) a fluid loss additive in an amount effective to reduce fluid loss, to below 100 cc/30 min said fluid loss additive comprised of a blend of (i) a copolymer of acrylamide and vinyl imidazole, in a weight percent ratio of from about 95:5 to 5:95, acryamide to vinyl imidazole said copolymer having a molecular weight range of from about 10,000 to 3,000,000, and (ii) a copolymer of vinyl pyrrolidone and sodium salt of sulfonate in a weight percent ratio of 80:20 to 20:80; the ratio of copolymer (i) to copolymer (ii) being in the range of 20:80 to 80:20.

• Assignee: BASF Corp., Parsippany, NJ (United States)
• Patent Number(s): US 5228915; A
• Application Number: PPN: US 7-981921
• OSTI ID: 6130934
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300 -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACRYLAMIDE
ADDITIVES
ALKALI METAL COMPOUNDS
AMIDES
AZOLES
BUILDING MATERIALS
CEMENTING
CEMENTS
CHEMICAL COMPOSITION
CONCENTRATION RATIO
COPOLYMERS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
IMIDAZOLES
LACTAMS
MATERIALS
MOLECULAR WEIGHT
NATURAL GAS WELLS
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
PYRROLES
PYRROLIDONES
SODIUM COMPOUNDS
SULFONATES
WATER
WATER WELLS
WELL COMPLETION
WELLS