US 12,168,750 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 Nov. 14, 2022, as Appl. No. 18/055,323.
Prior Publication US 2024/0158685 A1, May 16, 2024
Int. Cl. C09K 8/44 (2006.01); C09K 8/035 (2006.01); E21B 21/00 (2006.01)
CPC C09K 8/44 (2013.01) [C09K 8/035 (2013.01); E21B 21/003 (2013.01)] 27 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 an aqueous solution of a salt tolerant osmotic barrier polymer to form a suspension;
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 polymers; and
mixing a colloidal gas aphron (CGA) with the composition to reduce a density of the composition.