Low fluid loss salt saturated cement slurries, additives and methods
This patent describes a method of cementing a conduit in a well bore penetrating a subterranean formation comprising introducing a low fluid loss, low viscosity aqueous salt saturated cement slurry into the annulus between the conduit and the well bore and allowing the slurry to set. The slurry being comprised of hydraulic cement, salt saturated water present in an amount sufficient to form a pumpable slurry, and a fluid loss reducing complex present in the slurry in an amount in the range of from about 0.25% to about 2% by weight of dry cement comprised of the reaction product formed by admixing (i) polyethyleneimine having a molecular weight above about 50,000 and (ii) sulfonated organic compounds comprising an admixture of lignosulfonic acid salts having Na, Ca, or NH/sub 4/ as the associated cation, together with naphthalene sulfonic acid condensed with formaldehyde having a molecular weight above about 5,000, the ratio by weight of the polyethyleneimine to the sulfonated compounds in the complex, being in the range of from 1:14 to about 7.5:1, and the ratio by weight of the lignosulfonic acid salts to the naphthalene sulfonic acid condensed with formaldehyde in the complex being in the range of from about 1:5 to about 5:1, the reaction product being formed prior to admixture of the complex with eigher the hydraulic cement or with any substantial portion of the salt in the saturated water.
- Assignee:
- Halliburton Co., Duncan, OK
- Patent Number(s):
- US 4791989
- OSTI ID:
- 6387178
- Country of Publication:
- United States
- Language:
- English
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Production
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ALDEHYDES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
AROMATICS
BUILDING MATERIALS
CALCIUM COMPOUNDS
CEMENTING
CEMENTS
CHEMICAL COMPOSITION
CONDENSED AROMATICS
DISPERSIONS
FORMALDEHYDE
HYDROCARBONS
MATERIALS
MIXTURES
NAPHTHALENE
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
ORGANIC SULFUR COMPOUNDS
POLYETHYLENES
POLYMERS
POLYOLEFINS
QUANTITY RATIO
SALTS
SLURRIES
SODIUM COMPOUNDS
SOLUTIONS
SULFONIC ACIDS
SUSPENSIONS
WELL COMPLETION
WELLS