RESERVOIR ACTIVATED EMULSION BREAKING FOR LOST CIRCULATION

摘要

An oil-in-water emulsion is provided to place a sealant within a subterranean formation by being deployed into the formation to reacte with the formation's included water to break the emulsion, leaving the emulsified components, some of which act as the sealant to form at least a partial seal. The emulsion does not form a seal until emulsified in response to formation water conditions (salinity, pH, calcium ion concentration, temperature), and can be a drilling fluid or a pill during drilling activities.

主权项

1. An oil-in-water emulsion subterranean formation sealant that contains a hydrocarbon, water and a surfactant, such that the surfactant is soluble in the emulsion water and insoluble in the presence of subterranean formation water.