公开(公告)号：WO2022026090A1

公开(公告)日：2022-02-03

申请号：PCT/US2021/038862

申请日：2021-06-24

Applicant: STEPAN COMPANY

Inventor： PHATAK, Alhad ,  REN, Ginger ,  SEYMOUR-LOYA, Brian ,  SANDERS, Aaron

IPC: C09K8/68 ,  E21B43/26 ,  C10M157/04

Abstract: A hydraulic fracturing method is disclosed. A small proportion of a nonionic surfactant is used in combination with an acrylamide polymer emulsion friction reducer, the proppant, and the base water to boost the viscosity of the fracturing fluid. The nonionic surfactant has a calculated HLB within the range of 10 to 17. The nonionic surfactants include selected aralkylated phenol ethoxylates, amine or amidoamine ethoxylates, mixed EO/PO alcohol alkoxylates, ethoxylated alcohols, ethoxylated amides, and alkylphenol ethoxylates. The nonionic surfactant boosts the viscosity of the fracturing fluid, promotes proppant transfer, and enables more-efficient hydrocarbon production.

公开(公告)号：WO2020005390A1

公开(公告)日：2020-01-02

申请号：PCT/US2019/031038

申请日：2019-05-07

Applicant: STEPAN COMPANY

Inventor： REN, Ginger ,  SANDERS, Aaron

IPC: 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 C 8 -C 18 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.