US 12,134,729 B2
Drilling fluid additives and fracturing fluid additives containing cellulose nanofibers and/or nanocrystals
Jean-Pierre Monclin, Lafayette, LA (US); Kimberly Nelson, Atlanta, GA (US); and Theodora Retsina, Atlanta, GA (US)
Assigned to GranBio Intellectual Property Holdings, LLC, Thomaston, GA (US)
Filed by GranBio Intellectual Property Holdings, LLC, Minnetrista, MN (US)
Filed on May 3, 2023, as Appl. No. 18/142,760.
Application 18/142,760 is a continuation of application No. 17/201,047, filed on Mar. 15, 2021, granted, now 11,674,071.
Application 17/201,047 is a continuation of application No. 16/247,266, filed on Jan. 14, 2019, abandoned.
Application 16/247,266 is a continuation of application No. 15/988,024, filed on May 24, 2018, abandoned.
Application 15/988,024 is a continuation of application No. 15/450,059, filed on Mar. 6, 2017, abandoned.
Application 15/450,059 is a continuation of application No. 14/743,771, filed on Jun. 18, 2015, abandoned.
Claims priority of provisional application 62/014,208, filed on Jun. 19, 2014.
Prior Publication US 2023/0272259 A1, Aug. 31, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/64 (2006.01); C09K 8/035 (2006.01); C09K 8/10 (2006.01); C09K 8/32 (2006.01); C09K 8/68 (2006.01); C09K 8/80 (2006.01); C09K 8/82 (2006.01); C09K 8/88 (2006.01); C09K 8/90 (2006.01)
CPC C09K 8/32 (2013.01) [C09K 8/035 (2013.01); C09K 8/10 (2013.01); C09K 8/64 (2013.01); C09K 8/68 (2013.01); C09K 8/685 (2013.01); C09K 8/80 (2013.01); C09K 8/82 (2013.01); C09K 8/88 (2013.01); C09K 8/887 (2013.01); C09K 8/90 (2013.01); C09K 2208/08 (2013.01); C09K 2208/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A drilling fluid composition comprising a drilling fluid additive, wherein said drilling fluid additive comprises hydrophobic, lignin-coated cellulose nanofibrils, wherein said hydrophobic, lignin-coated cellulose nanofibrils are present in said drilling fluid composition in a concentration from 0.001 wt % to 10 wt %, wherein said hydrophobic, lignin-coated cellulose nanofibrils have a cellulose crystallinity of at least 60%, wherein said drilling fluid additive further comprises a crosslinking agent, and wherein said hydrophobic, lignin-coated cellulose nanofibrils are crosslinked to enhance gelling within said drilling fluid composition.