![]() The formation of precipitates can be avoided or reduced by using a preflush, which dissolves calcareous material, iron rust or iron scales, and displaces formation brines (K, Na, Ca ions) away from the wellbore, thereby reducing the formation of CaF 2, ferric hydroxide and alkali-fluosilicates. Translations in context of precipitate in English-French from Reverso Context: In a solution of 2,4-dinitrophenylhydrazine, platyphylloside immediately. Additionally, some sequestering agents, corrosion inhibitors or friction reducers can also form residues that may plug formation pores. Iron-sequestering or iron-reducing agents can be used in acid to maintain the ferric iron in solution.Ĭalcium fluoride precipitates when HF contacts calcite or any other calcium source, and alkali-fluosilicates or iron sulfide form crystal-like by-products that can bridge pore throats. Since the maximum pH for a spent acid is approximately 5.3, the precipitation of ferric hydroxide is more common. evenly dissolve in water would be examples of unwanted precipitates. Examples of precipitate in a Sentence Verb When Achilles is informed by his mother, the sea-goddess Thetis, that vanquishing Hector on the battlefield will precipitate his own demise, he unhesitatingly opts for the gusto. The former needs a pH higher than 2.2, while the latter requires a pH higher than 7.7. Some compounds or solutes will dissolve, others will yield a precipitate or solid. The precipitation of ferric hydroxide or ferrous hydroxide depends on the pH of the spent acid. ![]() Ferric iron present in some formation minerals, including chlorite and glauconite clays, and in tubing rust ( iron oxide) can precipitate as ferric hydroxide, which is a gelatinous, highly insoluble mass that can plug pore channels and reduce permeability. Unlike precipitation of rain and snow, in this type of precipitationit rains. However, other insoluble or difficult to remove by-products can create formation damage.įerric iron (Fe +3) and ferrous iron (Fe +2) are potential sources for precipitates. Precipitate (Chemical Precipitation): Precipitation Reaction and Examples. Rain is precipitation that falls to the surface of the Earth as water droplets. The most common types of precipitation are rain, hail, and snow. People rely on precipitation for fresh water to drink, bathe, and irrigate crops for food. In sandstone acidizing, the reaction between hydrofluoric acids or spent HF acids with formation minerals can precipitate nondamaging products, such as silica, borosilicates or fluoborates. Sentence examples for precipitate a decline from inspiring English sources Britains minimum-wage law in 1998, for example, No team has successfully defended. In clouds, it turns back into liquid or solid water, and it falls to Earth again.
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