EDTA removes formation damage at Prudhoe Bay
Formation damage has been observed in some wells of the Prudhoe Bay Field. Laboratory and field testing confirmed that the primary cause of damage was the buildup of calcium carbonate scale either in the perforation tunnels or in the formation sandstone near the wellbore. Conventional acid treatments could dissolve this scale, but scale reprecipitation from the spent acid caused rapid productivity decline. A scale removal treatment using Na/sub 2/H/sub 2/EDTA has been developed that can effectively dissolve scale and chelate the dissolved metal ions. Chelation of the dissolved scale prevents scale reprecipitation. Of the 25 Prudhoe Bay wells acidized with EDTA, 19 have responded with a significant productivity increase. In 17 of these wells, productivity has been sustained after treatment.
- Research Organization:
- Exxon Production Research Co.
- OSTI ID:
- 5396237
- Report Number(s):
- CONF-820927-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE11188; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ALKALINE EARTH METAL COMPOUNDS
AMINO ACIDS
ARCTIC OCEAN
BAYS
BEAUFORT SEA
BENCH-SCALE EXPERIMENTS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATES
CARBOXYLIC ACIDS
CHELATES
CHELATING AGENTS
COMPLEXES
EDTA
FIELD TESTS
FORMATION DAMAGE
GEOLOGIC DEPOSITS
MINERAL RESOURCES
OIL FIELDS
OIL WELLS
ORGANIC ACIDS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PERFORATION
PETROLEUM DEPOSITS
PRODUCTIVITY
PRUDHOE BAY
RESOURCES
ROCKS
SANDSTONES
SCALING
SEAS
SEDIMENTARY ROCKS
SURFACE WATERS
TESTING
WELLS