Fluid loss agents for oil well cementing composition
This patent describes a method of cementing a conduit in a borehole penetrating an earthen formation by introducing a cementing composition into the space. The cementing composition comprises: water; hydraulic cement; a water dispersible fluid loss additive comprised of a terpolymer of (1) from about 10 to about 75 weight percent of an acid selected from the group consisting of 2-acrylamido-2 methylpropane sulfonic acid, sodium vinyl sulfonate and vinyl benzene sulfonate; (2) from about 10 to 76 weight percent of a nonionic monomer selected from the group consisting of acrylamide, N,N-dimethylacrylamide, N-vinyl pyrrolidone, N-vinyl acetamide and dimethylamino ethyl methacrylate; and (3) from about 1 to 60 weight percent of an unsaturated polybasic acid selected from the group consisting of itaconic acid, maleic acid, fumaric acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, dimethylmuconic acid and 1-butene 2,3,4-tricarboxylic acid, the polymer having an average molecular weight of between about 200,000 and about 1,000,000 being in its free acid or partially or completely neutralized form and being at least water dispersible.
- Assignee:
- Diamond Shamrock Chemicals Co., Dallas, TX
- Patent Number(s):
- US 4674574
- OSTI ID:
- 6183745
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
ACRYLAMIDE
ADDITIVES
ALKALI METAL COMPOUNDS
AMIDES
AROMATICS
BENZENE
BUILDING MATERIALS
CEMENTING
CEMENTS
CHEMICAL COMPOSITION
FLUIDS
HYDRAULIC FLUIDS
HYDROCARBONS
HYDROGEN COMPOUNDS
LOSSES
MATERIALS
MONOMERS
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
POLYMERS
SODIUM COMPOUNDS
SULFONATES
SULFONIC ACIDS
VINYL MONOMERS
WATER
WATER WELLS
WELLS
WORKING FLUIDS