US 11,891,565 B1
Host-guest lost-circulation materials for sealing lost circulation zones in wellbores
Hasmukh A. Patel, Katy, TX (US); Younane Abousleiman, Norman, OK (US); and Ashok Santra, The Woodlands, TX (US)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Aug. 12, 2022, as Appl. No. 17/819,419.
Int. Cl. E21B 21/00 (2006.01); C09K 8/035 (2006.01); C09K 8/44 (2006.01); C09K 8/487 (2006.01); C09K 8/42 (2006.01)
CPC C09K 8/44 (2013.01) [C09K 8/035 (2013.01); C09K 8/426 (2013.01); C09K 8/487 (2013.01); E21B 21/003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A host-guest lost circulation material (LCM) composition for sealing lost circulation zones in wellbores, the LCM composition comprising:
an aqueous solution;
one or more linear polymer chains, the linear polymer chains comprising polyethylene glycols (PEG) with molecular weights greater than 2500 g/mol, polypropylene glycols (PPG), polydimethylsiloxanes (PDMS), or combinations thereof; and
one or more cyclic molecules comprising alpha cyclodextrin, beta cyclodextrin, gamma cyclodextrin, or combinations thereof, and wherein
the one or more cyclic molecules form a host-guest structure around the one or more linear polymer chains utilizing van der Waals forces, wherein the LCM composition does not comprise cement.