New cement formulation helps solve deep cementing problems
Invert-emulsion muds are used in most deep, hot wells. The internal aqueous phase of these muds frequently contains high concentrations of salts. It is desirable to complete these wells with a cement slurry containing salt concentrations up to and including saturation to minimize compatibility problems between cement slurry and mud. Above their effective temperature range, however, saturated salt cements - though still considered desirable for their other properties - pose design difficulties regarding thickening time, fluid loss, and rheology. High salt concentrations tend to decrease the effectiveness of most common cement additives - e.g., retarders, fluid-loss additives, and dispersants. At high temperatures, concentrations of these additives can become unacceptably large, while the additives themselves are not as effective under these conditions. Development of and field experience with a new cementing formulation for deep, high-temperature, saturated-salt applications have helped resolve the cement design problems encountered in south Texas and southern and offshore Louisiana. A single synthetic-polymer additive provides cement retardation, fluid-loss control, and dispersant properties with normal design considerations as opposed to the lengthy design requirements of other cement systems. A particular benefit derived from use of the new cement system involves cementing of long liners. Such liners frequently require squeeze cementing at the liner top because the cement is designed for conditions at the bottom of the liner and is thus frequently over-retarded for the cooler temperatures encountered at the top of the liner. This over-retardation tendency is alleviated greatly by use of the new saturated-salt cement additive.
- Research Organization:
- Halliburton Services (US)
- OSTI ID:
- 5903072
- Journal Information:
- J. Pet. Technol.; (United States), Vol. 41:6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
36 MATERIALS SCIENCE
CEMENTS
PHYSICAL PROPERTIES
DRILLING FLUIDS
ADDITIVES
RHEOLOGY
LOUISIANA
OFFSHORE OPERATIONS
DESIGN
OIL WELLS
CEMENTING
HIGH TEMPERATURE
PHASE STUDIES
SLURRIES
WELL COMPLETION
BUILDING MATERIALS
DISPERSIONS
FEDERAL REGION VI
FLUIDS
MATERIALS
MIXTURES
NORTH AMERICA
SUSPENSIONS
USA
WELLS
020300* - Petroleum- Drilling & Production
423000 - Engineering- Marine Engineering- (1980-)
360603 - Materials- Properties