US 12,116,523 B1
Method of making drilling fluid composition with functionalized carbon
Tawfik Abdo Saleh, Dhahran (SA); and Azeem Rana, Dhahran (SA)
Assigned to KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed by KING FAHD UNIVERSITY OF PETROLEUM AND MINERALS, Dhahran (SA)
Filed on Mar. 15, 2024, as Appl. No. 18/606,478.
Application 18/606,478 is a continuation of application No. 18/315,542, filed on May 11, 2023, granted, now 11,981,857.
This patent is subject to a terminal disclaimer.
Int. Cl. C09K 8/20 (2006.01)
CPC C09K 8/206 (2013.01) [C09K 2208/08 (2013.01); C09K 2208/12 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A method of making a drilling fluid composition, comprising:
dispersing particles of a shale material in an aqueous base fluid to form a suspension;
wherein the shale material has an average particle size in a range of 1500 to 4000 micrometers (μm);
functionalizing an activated carbon (AC) with an acid to form a functionalized AC,
reacting the functionalized AC with ethylene diamine to form a polyamine-functionalized activated carbon (AC-PAD);
mixing the polyamine-functionalized activated carbon, a thickener, a fluid loss control additive, an adsorbent, a borehole stabilizer, and a suspension to form the drilling fluid composition;
wherein the AC-PAD is present in the drilling fluid composition at a concentration of 0.1 to 2 wt. % based on a total weight of the drilling fluid composition;
wherein the drilling fluid composition comprises:
the aqueous base fluid;
the polyamine-functionalized activated carbon;
0.1 to 10 wt. % of a shale material;
0.01 to 2 wt. % of the thickener;
0.1 to 10 wt. % of the fluid loss control additive;
0.01 to 5 wt. % of the adsorbent; and
1 to 20 wt. % of the borehole stabilizer;
wherein each wt. % is based on a total weight of the drilling fluid composition;
wherein the AC-PAD is uniformly disposed on surfaces of the shale material; and
wherein the shale material has an average pore size of 5 to 400 nanometers (nm).