CPC C09K 8/487 (2013.01) [C09K 8/032 (2013.01); C09K 8/5045 (2013.01); C09K 8/665 (2013.01)] | 20 Claims |
1. A method of treating lost circulation in a subterranean formation comprising:
selecting an aspect ratio for a precipitated calcium carbonate lost circulation material (PCCLCM) based at least in part on a type of the subterranean formation;
forming the PCCLCM to have the selected aspect ratio from a reaction mixture comprising a calcium species and a carbonate species;
wherein the calcium species is selected from the group consisting of a calcium ion, a calcium soluble salt, and any combination thereof,
wherein the carbonate species is an ammonium carbonate ion, and
wherein the calcium species and the carbonate species are mixed in a mixing tank fluidically connected to a subterranean formation;
adjusting precipitation conditions to alter morphology of the PCCLCM;
adding non-calcium carbonate fibers to the reaction mixture, wherein the non-calcium carbonate fibers are present in an amount from about 1% to about 30% by weight of the PCCLCM; and
introducing a lost circulation treatment fluid into the subterranean formation, the lost circulation treatment fluid comprising an aqueous base fluid and the PCCLCM, wherein at least a portion of the PCCLCM is deposited in a filter cake across the formation pore throats, and/or fractures to reduce loss of treatment fluids into the subterranean formation.
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