Patent · US Active

In situ microemulsions used as spacer fluids

US8871695B2 · kind B2 · utility

3Cited by
22References
15Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 22, 2008
Grant dateOct 28, 2014
Priority date—
Expiry dateNov 12, 2029

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K8/524
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

Nanoemulsions, miniemulsions, microemulsion systems with excess oil or water or both (Winsor III) or single phase microemulsions (Winsor IV) may be formed in situ during hydrocarbon recovery operations after drilling with OBM or SBM using one or more fluid pills. The nanoemulsions, miniemulsions, microemulsion systems with excess oil or water or both or single phase microemulsions remove oil and solids from the well and wellbore surfaces. In one non-limiting embodiment, a single phase microemulsion (SPME) or other in situ-formed fluid may be created from a polar phase, a nonpolar phase, at least one viscosifier, and at least one surfactant.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.