Well cementing in permafrost

Patent · Tue Dec 04 00:00:00 EST 1979

OSTI ID:5279751

Wilson, W N

A process for cementing a string of pipe in the permafrost region of a borehole of a well wherein aqueous drilling fluid actually used in drilling the wellbore in the permafrost region of a wellbore is employed. The drilling fluid contains or is adjusted to contain from about 2 to about 16 volume percent solids. Mixing with the drilling fluid (1) an additive selected from the group consisting of lignosulfonate, lignite, tannin, and mixtures thereof, (2) sufficient base to raise the pH of the drilling fluid into the range of from about 9 to about 12, and (3) cementitious material which will harden in from about 30 to about 40 hours at 40/sup 0/F. The resulting mixture is pumped into the permafrost region of a wellbore to be cemented and allowed to harden in the wellbore. There is also provided a process for treating an aqueous drilling fluid after it has been used in drilling the wellbore in permafrost, and a cementitious composition fro cementing in a permafrost region of a wellbore.

• Assignee: Atlantic Richfield Co.
• Patent Number(s): US 4176720
• OSTI ID: 5279751
• Resource Relation: Patent File Date: Filed date 27 Jul 1978
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
DRILLING FLUIDS
PERMAFROST
WELL COMPLETION
BOREHOLES
LIGNITE
MEDIUM TEMPERATURE
PH VALUE
SULFONATES
TANNIC ACID
WELL DRILLING
AROMATICS
BROWN COAL
CARBONACEOUS MATERIALS
CARBOXYLIC ACIDS
CAVITIES
COAL
DRILLING
ENERGY SOURCES
FOSSIL FUELS
FUELS
HYDROXY COMPOUNDS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
PHENOLS
POLYPHENOLS
020200* - Petroleum- Reserves
Geology
& Exploration