...J. G. Southwick The expected loss of useful alkalinity caused by the slow dissolution of silica from pure quartz sand is shown for some typical alkaline flooding solutions (about 1 % NaOH or 1.25% sodium orthosilicate) to be only about 10 to 20%. This conclusion is based on the observation...

... tests and X-ray analyses identify the various mineral reactions and their rates. For clayey sands a fast, reversible, sodium/hydrogen ion exchange retards alkali concentration velocities. Fine silica and quartz are suggested as important dissolving minerals, with slower-dissolving clays and clay...

... with chemical additives to control scaling. The rates of formation, chemical constitution, and morphology of the scales were examined as functions of temperature, brine salinity, substrate material, and antiscalant additive activity. Potential antiscalant compounds were screened using a silica-precipitation...

...Oleh Weres; Andrew Yee; Leon Tsao The polymerization of dissolved silica in aqueous solutions up to 100°C and containing up to 1 M NaCl has been studied experimentally, and theoretically. In this paper, the results of this work are presented in a form suitable for practical use in interpreting...

...E. G. Bohlmann; R. E. Mesmer; P. Berlinski In our experiments, supersaturated brines were passed through columns packed with several forms of silica (crystalline α -quartz, polycrystalline α -quartz, and porous Vycor). Also, silica deposition on ThO 2 microspheres and titanium powder was studied...

... extremely rapid (30- to 60-day) cement deterioration in strength and permeability. Thus, an API Class G cement (without silica) completely disintegrated (to granular size) in 30 days when exposed to 460 deg. F (238 deg. C) steam. Significantly we found that this sample contained (on X-ray diffraction...

...Jean Claude Labrid The thermodynamic aspect of sandstone acidizing by hydrofluoric acid (HF) is examined. It is shown that silica dissolution, with a first order in HF concentration leads almost exclusively to the formation of fluosilicic acid. Clay and feldspar dissolution is much more complex...