Well completion technology. Chelating agent solves scale problem to halt production slide in Prudhoe Bay
Problems associated with scale deposition and the chemistry affecting Sadlerochit reservoir brine in Prudhoe Bay wells were investigated. It was found that the Sadlerochit Formation cannot be exposed to calcium chloride (CaCl/sub 2/) brine, either as a completion fluid or as a spent acid. The scale precipitate builds up, even though hydrochloric acid may dissolve the scale temporarily, and eventually exacerbates the problem. The technique showing the most promise in combating the problem proved to be use of a chelating agent to hold the dissolved scale in solution. The organic form that demonstrated all requisite properties was disodium dihydrogen EDTA. The EDTA matrix acid treatment is used only in wells identified as having the special case condition of sensitivity to CaCl/sub 2/ brine.
- OSTI ID:
- 6033320
- Journal Information:
- Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 81:50; ISSN OIGJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
AMINO ACIDS
ARCTIC OCEAN
BAYS
BEAUFORT SEA
CARBOXYLIC ACIDS
CHELATING AGENTS
CONTROL
EDTA
NATURAL GAS WELLS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
PRUDHOE BAY
SCALE CONTROL
SCALING
SEAS
SURFACE WATERS
WELLS