US 12,466,987 B2
Method and composition for subsurface well intervention to reduce well fluid loss
Nathan R. Hutchings, Shreveport, LA (US)
Assigned to RheoVest, LLC, Shreveport, LA (US)
Filed by RheoVest, LLC, Shreveport, LA (US)
Filed on Mar. 25, 2024, as Appl. No. 18/615,045.
Application 18/615,045 is a continuation in part of application No. 18/055,323, filed on Nov. 14, 2022, granted, now 12,168,750.
Prior Publication US 2024/0309262 A1, Sep. 19, 2024
This patent is subject to a terminal disclaimer.
Int. Cl. E21B 21/00 (2006.01); C09K 8/512 (2006.01); C09K 8/514 (2006.01); C09K 8/516 (2006.01)
CPC C09K 8/512 (2013.01) [C09K 8/514 (2013.01); C09K 8/516 (2013.01); E21B 21/003 (2013.01); C09K 2208/08 (2013.01)] 12 Claims
OG exemplary drawing
 
1. 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.