US 12,281,255 B2
C-36 dimer diamine hydrochloride salt as primary viscosifier for invert-emulsion drilling fluids
Vikrant Wagle, Dhahran (SA); Abdullah Saleh Hussain Al-Yami, Dhahran (SA); Omprakash Pal, Dhahran (SA); Ali Mohammed Hussain Al Safran, Dhahran (SA); and Khawlah Alanqari, Al Khobar (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on May 2, 2024, as Appl. No. 18/653,165.
Application 18/653,165 is a division of application No. 17/850,368, filed on Jun. 27, 2022, granted, now 12,024,669.
Prior Publication US 2024/0279528 A1, Aug. 22, 2024
Int. Cl. C09K 8/035 (2006.01); C09K 8/03 (2006.01); E21B 21/06 (2006.01)
CPC C09K 8/035 (2013.01) [C09K 8/032 (2013.01); E21B 21/065 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A method for drilling a wellbore with an invert-emulsion drilling fluid, comprising:
preparing the invert-emulsion drilling fluid by:
reacting a C-36 dimer diamine with hydrochloric acid to form a C-36 dimer diamine dihydrochloride salt (CDDH);
drying the CDDH to form a CDDH solid;
dissolving calcium chloride in water to form a calcium chloride solution;
dissolving the CDDH solid in the calcium chloride solution to form a CDDH solution;
mixing an emulsifier with a nonaqueous solvent to form an initial mixture;
adding the CDDH solution to the initial mixture to form the invert-emulsion drilling fluid;
adding drilling fluid additives to the invert-emulsion drilling fluid to form a drilling mud; and
using the drilling mud to remove cuttings from the wellbore during drilling.