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Evaluation of calcium carbonate scale inhibitors for Prudhoe Bay, Alaska

Conference ·
OSTI ID:6968467
;
The formation of calcium carbonate scale in the perforations and near wellbore formation sandstone is one of the major factors affecting production in the Prudhoe Bay field. Previous work has shown that squeeze treatments using certain phosphonate scale inhibitors help to control the formation of calcium carbonate scale in low water-cut wells. However, the desorption rate of the phosphonate from the formation may cause the effectiveness of the treatment to be decreased dramatically as the water-cut in the wells increases. It has been observed that scale inhibitor squeeze treatments employing polymer-phosphonate blends appear to last longer in high water-cut wells than those treated only with phosphonate. This study evaluated the effect of various polymers on the desorption rate and inhibitive character of the phosphonate previously determined to be the most effective in inhibiting calcium carbonate scale in Prudhoe Bay. Standard NACE scale inhibitor tests were conducted to evaluate the effectiveness in preventing scale for the various systems. Flow tests in formation cores were run to determine the feedback rate of the phosphonate from various systems. The core studies were monitored for the amount of phosphonate desorbed as a function of water-cut and total pore volumes of brine flowed through the core. Results showed that a high molecular weight maleic copolymer to be the most effective in decreasing the desorption rate of the phosponate.
OSTI ID:
6968467
Report Number(s):
CONF-861080-
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ADDITIVES
ALKALINE EARTH METAL COMPOUNDS
ARCTIC OCEAN
BAYS
BEAUFORT SEA
BRINES
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACIDS
CHEMICAL COMPOSITION
CONTROL
COPOLYMERS
CORROSION INHIBITORS
CRYSTAL STRUCTURE
DESCALING
DESORPTION
DICARBOXYLIC ACIDS
EFFICIENCY
FLOW RATE
GEOLOGIC DEPOSITS
MALEIC ACID
MICROSTRUCTURE
MINERAL RESOURCES
MONITORING
OIL FIELDS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
ORGANIC POLYMERS
OXYGEN COMPOUNDS
PERFORMANCE TESTING
PETROLEUM DEPOSITS
PHOSPHONATES
POLYMERS
POROSITY
PRUDHOE BAY
RESOURCES
ROCKS
SANDSTONES
SCALE CONTROL
SEAS
SEDIMENTARY ROCKS
SURFACE FINISHING
SURFACE WATERS
TESTING
WELLS