US 12,134,728 B2
Ethylene amine hydrochloride based shale inhibitor for aqueous drilling fluids
Vikrant Wagle, Dhahran (SA); Abdullah Al-Yami, Dhahran (SA); Omprakash Pal, Dhahran (SA); Ali Al-Safran, Dhahran (SA); Mohammad Alharthi, Dammam (SA); and Sara Alkhalaf, Alkhobar (SA)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on Apr. 8, 2022, as Appl. No. 17/716,353.
Prior Publication US 2023/0323183 A1, Oct. 12, 2023
Int. Cl. C09K 8/04 (2006.01); C09K 8/035 (2006.01); C09K 8/528 (2006.01)
CPC C09K 8/04 (2013.01) [C09K 8/035 (2013.01); C09K 8/528 (2013.01); C09K 2208/12 (2013.01)] 17 Claims
 
1. A wellbore fluid, comprising:
a mixture of ethylene ammonium salts having a number average molecular weight in a range of 250 to 500 grams per mole, wherein the mixture of ethylene ammonium salts comprises different chemical structures selected from the group consisting of Formula (I), Formula (II), and combinations thereof;

OG Complex Work Unit Chemistry
wherein:
each R of Formula (I) and Formula (II) is independently selected from hydrogen or a hydrocarbon group, a substituted hydrocarbon group, an alkyl ester group, or an alkyl amine group having from 1 to 28 carbon atoms;
each R1 and R2 of Formula (I) and each R3 and R4 of Formula (I) and Formula (II) is independently selected from hydrogen or a hydrocarbon groups having from 1 to 5 carbon atoms;
each R6 is independently selected from a hydrogen atom or an ethylene amine;
each m is independently selected from an integer from 1 to 10;
each n of Formula (I) and Formula (II) is independently selected from an integer from 3 to 10; and
each x of Formula (I) and Formula (II) is independently selected from an integer from 1 to 10; and
an aqueous base fluid,
wherein a pH of the wellbore fluid is in a range from 6.5 to 7.5.