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Michigan Basin. Acid sludge being treated in Niagaran reef wells

Journal Article · · Northeast Oil Report.; (United States)
OSTI ID:5283597
Sludges formed when crude oil comes in contact with acid has been recognized as a serious problem. The problem was observed in California wells that were slow to clean up following acidizing treatments. Often, asphalt-like material was returned with the treating fluids and, in some cases, the treatment resulted in complete or partial plugging of the well. A study of this problem revealed that crude oils produced from acid- treated wells had formed solid precipitates consisting primarily of asphaltenes, resins, paraffin waxes, and other high-molecular-weight hydrocarbons. These materials apparently were precipitated from the crude oil by the reduction in pH as a result of acid contact. In Michigan, the formation of crude oil sludge during acidizing recently was found to be a problem in the Silurian Niagaran Reef Formation. Wells in a number of these reef fields experienced the same problems as those in California, and examination of produced crudes revealed the same sludge-forming tendencies. The solution to the sludge problem appears to be prevention rather than cure. Hydrochloric acid pretreatment is recommended.
OSTI ID:
5283597
Journal Information:
Northeast Oil Report.; (United States), Journal Name: Northeast Oil Report.; (United States) Vol. 3:3; ISSN NOREE
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ACIDIZATION
ALKANES
ASPHALTENES
ASPHALTS
BITUMENS
FEDERAL REGION V
GEOLOGIC AGES
GEOLOGIC FORMATIONS
GEOLOGIC STRUCTURES
HYDROCARBONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MICHIGAN
NORTH AMERICA
OIL WELLS
ORGANIC COMPOUNDS
ORGANIC POLYMERS
OTHER ORGANIC COMPOUNDS
PALEOZOIC ERA
PARAFFIN
PETROCHEMICALS
PETROLEUM PRODUCTS
PLUGGING
POLYMERS
RESINS
SEDIMENTARY BASINS
SILURIAN PERIOD
SLUDGES
STIMULATION
TAR
USA
WAXES
WELL COMPLETION
WELL STIMULATION
WELLS