METHOD FOR TREATING SUBTERRANEAN FORMATIONS

摘要

Control release capsules comprising a breaker contained within a enclosure member are employed to break fracturing fluids. The enclosure member is permeable to at least one liquid in the subterranean formation or a liquid that is injected with the capsules such that upon sufficient exposure to the liquid, rupture of the capsules is delayed for a predetermined time interval, thereafter releasing the breaker to the formation. The time of release of the breaker can be conducted in a controlled manner such that the entire amount of the breaker introduced into the formation.