Patent · US Expired

Spotting fluid for differential sticking

US6662871B2 · kind B2 · utility

14Cited by
9References
5Claims
0Family size

Assignee

Inventors

Key dates

Filing dateApr 8, 2002
Grant dateDec 16, 2003
Priority date
Expiry dateApr 8, 2022

Classification

  • Technology area (CPC Y)Emerging Cross-Sectional Technologies
  • CPC primaryY10S507/94
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

A new composition for a spotting fluid and a method of using such spotting fluid for freeing differential stuck pipe in a subterranean well drilling operation is disclosed. The composition comprises an invert water-in-oil emulsion comprising iso-butyl oleate as its external phase and glycerin as the internal phase. In an alternative embodiment, calcium chloride and water may be substituted for glycerin.

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