Open AccessLost circulation control materials. Progress report
Author(s) -
M.L. Allan,
L.E. Kukacka
Publication year - 1994
Language(s) - English
Resource type - Reports
DOI - 10.2172/53661
Subject(s) - aluminate , borax , cement , calcium , gypsum , retarder , lost circulation , ground granulated blast furnace slag , materials science , phosphate , durability , chemical engineering , ettringite , mineralogy , chemistry , metallurgy , composite material , drilling fluid , portland cement , drilling , raw material , organic chemistry , engineering
Work in FY 94 continued to investigate the use of calcium phosphate cements as lost circulation control materials for geothermal wells. The calcium phosphate cements were produced by reacting calcium aluminate cement with sodium phosphate compounds. Pumpable formulations with thickening times up to two hours at temperatures between 25 to 90{degrees}C were developed and characterized. The materials showed rapid set behaviour, early strength development, low permeability and acceptable durability in hydrothermal environments. Strengths up to 4 MPa were achieved four hours after mixing and water permeabilities were of the order of 10{sup -9} to 10{sup -7} cm/s at 24 hours. Partial replacement of calcium aluminate cement with ground granulated blast furnace slag was found to reduce the amount of borax retarder required to maintain pumpability at elevated temperatures and pressures