Low density cement slurry and its use

Patent · Tue Feb 24 04:00:00 EST 1981

OSTI ID:6492557

Holman, G B; Powers, C A; Smith, R C

A 9 to 12 ppg (1.08 to 1.4 kg/liter) cement slurry is described for use in oil well type completions which comprises hydraulic cement of about 10 to 30 weight percent hollow glass microspheres based the weight of the cement and sufficient water to form a pumpable slurry with an API free water content of no more than about 2 volume percent. This slurry is preferably mixed with an amount of water required to produce a slurry with the hydraulic cement having at least an API minimum water content and an API free water content of no more than about 2 volume percent and an additional amount of water equal to 1.3 to about 1.8 weight percent water based on the weight of the hydraulic cement for each weight percent of the microspheres. The microspheres have true particle densities of about 0.2 to about 0.5 gm/cm3, hydrostatic collapse strengths of at least 500 psi (3447 kpa) and average particle diameters of less than about 500 microns.

• Assignee: Standard Oil Co (Indiana)
• Patent Number(s): US 4252193
• OSTI ID: 6492557
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
36 MATERIALS SCIENCE
360601 -- Other Materials-- Preparation & Manufacture
360603 -- Materials-- Properties
BUILDING MATERIALS
CEMENTS
DISPERSIONS
GLASS
MATERIALS
MICROSPHERES
MIXTURES
OIL WELLS
SLURRIES
SUSPENSIONS
WELL CASINGS
WELL COMPLETION
WELLS