公开(公告)号：US11472994B2

公开(公告)日：2022-10-18

申请号：US17133320

申请日：2020-12-23

Applicant: STEPAN COMPANY

Inventor： Yongling Ginger Ren ,  Aaron Sanders ,  Jonathan Mohandessi

IPC: C09K8/035 ,  E21B21/06

Abstract: A method for demulsifying a recovered drilling fluid is disclosed. A recovered drilling fluid is first combined with dilution water and a diethanolamine-based C8-C18 alkanolamide demulsifying agent. The recovered drilling fluid comprises hydrocarbons, a brine having at least 25% total dissolved solids, an emulsifier, and undissolved oil-wetted solids. In a second step, the mixture is separated, or is allowed to separate, into three distinct phases, including a clear oil phase comprising the hydrocarbons, a clear brine phase, and a water-wetted solid phase. Compositions suitable for use as demulsifiers and demulsified compositions are also disclosed. The alkanolamide demulsifying agents enable rapid, clean separation of phases and efficient recovery of 80% or more of the oil phase from the recovered drilling fluid.

公开(公告)号：US11827836B2

公开(公告)日：2023-11-28

申请号：US17949433

申请日：2022-09-21

Applicant: STEPAN COMPANY

Inventor： Yongling Ginger Ren ,  Aaron Sanders ,  Jonathan Mohandessi

IPC: C09K8/035 ,  E21B21/06

CPC classification number: C09K8/035 ,  E21B21/06 ,  E21B21/063 ,  E21B21/065

Abstract: A demulsified composition comprising a clear oil phase comprising hydrocarbons, a clear brine phase comprising up to 5 wt. % of a diethanolamine-based C8-C18 alkanolamide demulsifying agent, and a water-wetted solid phase.