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AssigneeBaker Hughes Oilfield Operations LLC
InventorsRostyslav Dolog, Qusai A. Darugar, Radhika Suresh, Oleg Mazyar
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A method of reducing lost circulation includes introducing into a subsurface formation a wellbore fluid containing an encapsulated lost circulation material having a core including an elastomer and a disintegrating agent, and the disintegrating agent including at least one of the phase change material or a gas-producing material, and a shell encapsulating the core; heating the disintegrating agent to cause the phase change material to expand, or to cause the gas-producing material to produce a gas, or a combination thereof to break the shell; and releasing the elastomer from the encapsulated lost circulation material; expanding the elastomer; and filling a void or fracture of the subsurface formation with the expanded elastomer to reduce fluid loss.
An encapsulated lost circulation material comprising a particulate having
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The encapsulated lost circulation material of claim 21, wherein the phase change material comprises at least one of an inorganic salt, an eutectic mixture of inorganic salts, a metal hydroxide, an eutectic mixture of an inorganic salt with an organic material, a hydrate of an inorganic salt, a hydrate of metal hydroxide, or an organic material.
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Dependencies are inferred from the claim text.