公开(公告)号：US11274242B2

公开(公告)日：2022-03-15

申请号：US16798964

申请日：2020-02-24

Applicant: STEPAN COMPANY

Inventor： Brian Seymour-Loya ,  Aaron Sanders ,  Dawn Friesen ,  Gregory P. Dado

IPC: C09K8/68 ,  C10M157/04 ,  C10N50/00 ,  C10N30/06 ,  C10N40/08

Abstract: Compositions comprising an acrylamide polymer emulsion and a nonionic surfactant suitable for use as friction reducers for hydraulic fracturing are disclosed. The nonionic surfactants include aralkylated phenol ethoxylates, amine ethoxylates, amidoamine ethoxylates, linear or branched alcohol EO/PO alkoxylates, ethoxylated alcohols, alkylphenol ethoxylates, and EO-capped poly(oxypropylene) block copolymers. Improved hydraulic fracturing processes in which an acrylamide polymer emulsion is used as a friction reducer are also described. In these processes, the surfactant is included in the composition with the acrylamide polymer friction reducer, or it is introduced separately into the process. The performance of low-cost polyacrylamide friction reducers can be boosted with a small proportion of certain readily available nonionic surfactants. The inventive compositions are effective in high-salinity environments, and their performance can sometimes exceed that of more-expensive salt-tolerant friction reducers, thereby reducing fresh water demand and enabling greater utilization of produced water.