E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/21
E21B 43/26 (2006.01) C09K 8/68 (2006.01) C09K 8/92 (2006.01)
Patent
CA 1274767
ABSTRACT 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.
556639
Tomkinson Donald L.
Walles Wilhelm E.
Williamson Trevor D.
Smart & Biggar
The Dow Chemical Company
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