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US 12,466,987 B2Granted
Method and composition for subsurface well intervention to reduce well fluid loss
AssigneeRheoVest, LLC
InventorNathan R. Hutchings
Life of this patent
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Abstract
A composition for lost circulation material (LCM) usable in subsurface well intervention includes particles of a hydrated superabsorbent polymer (SAP) mixed with a chemically-digestible fiber and an aqueous solution of a salt tolerant osmotic barrier polymer. A method for stopping fluid loss from a well into a formation penetrated by the well includes pumping a selected volume of the composition into the well until the selected volume is adjacent to the formation.
Claims12
A method for stopping fluid loss from a well into a formation penetrated by the well, comprising:
- pumping a selected volume of a composition into the well until the selected volume is adjacent to the formation, wherein the composition comprises:
- particles of a hydrated superabsorbent polymer (SAP) mixed with a chemically-digestible fiber and an aqueous solution of a salt tolerant osmotic barrier polymer to form a suspension;
- wherein the chemically digestible fiber comprises one or more of acid-soluble silica fibers, nylon fibers, poly-glycolic acid fibers or poly-lactic acid fibers;
- wherein the salt tolerant osmotic barrier polymer comprises one or more of linear polyacrylamide, branched polyacrylamide, polyacrylamide-acrylamide tertiary butyl sulfonic acid co-polymer, xanthan gum, guar gum, derivatized guar gum, cellulose polymer, or derivatized cellulose polymer;
- and
- mixing a colloidal gas aphron (CGA) with the composition to reduce a density of the composition.
3 more elements
Dependencies are inferred from the claim text.