US 12,448,867 B2
Shale inhibitor additives, wellbore fluids comprising said additives, and methods of using said fluids
Dimitri M. Khramov, Katy, TX (US); Balakrishnan Panamarathupalayam, Houston, TX (US); Sharath Chandra Mahavadi, Lexington, MA (US); and Lucas Mejia, Austin, TX (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, TX (US)
Appl. No. 18/693,602
Filed by Schlumberger Technology Corporation, Sugar Land, TX (US)
PCT Filed Sep. 29, 2022, PCT No. PCT/US2022/045192
§ 371(c)(1), (2) Date Mar. 20, 2024,
PCT Pub. No. WO2023/055905, PCT Pub. Date Apr. 6, 2023.
Claims priority of provisional application 63/249,666, filed on Sep. 29, 2021.
Prior Publication US 2024/0229606 A1, Jul. 11, 2024
Int. Cl. E21B 37/06 (2006.01); C09K 8/08 (2006.01)
CPC E21B 37/06 (2013.01) [C09K 8/08 (2013.01); C09K 2208/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A wellbore fluid, comprising:
an aqueous base fluid;
a shale inhibition additive comprising at least one hydrophobic amine that is a neutralized byproduct of a Nylon-6,6 manufacturing process, wherein the at least one hydrophobic amine is present at a concentration of at least about 40% of a total active amine concentration of the shale inhibition additive; and
at least one polymeric viscosifier;
wherein the at least one hydrophobic amine comprises a triamine-based shale inhibition agent and a diamine-based shale inhibition agent, and a ratio of the triamine-based shale inhibition agent to the diamine-based shale inhibition agent is from about 3:1 to about 10:1, and
wherein the wellbore fluid facilitates at least one of an increase in bulk hardness, an increase in shale inhibition, an increase in inhibition agent adsorption, a decrease in clay dispersion, or a decrease in cation exchange activity when the wellbore fluid is introduced into a subterranean formation.