The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 04, 2021
Filed:
Jun. 14, 2013
Akzo Nobel Chemicals International B.v., Amersfoort, NL;
Cornelia Adriana De Wolf, Eerbeek, NL;
Hisham Nasr-El-Din, College Station, TX (US);
Estevao De Oliveira Barra, Deventer, NL;
Edwin Rudolf Antony Bang, Arnhem, NL;
Theodor Johannes Stanitzek, Zülpich, DE;
NOURYON CHEMICALS INTERNATIONAL B.V., Arnhem, NL;
Abstract
A two-step process to produce oil or gas from a subterranean formation wherein in a first step the subterranean formation is treated with an aqueous composition containing a chelating agent selected from the group of glutamic acid N,N-diacetic acid or a salt thereof (GLDA), aspartic acid N,N-diacetic acid or a salt thereof (ASDA), methylglycine N,N-diacetic acid or a salt thereof (MGDA), and N-hydroxyethyl ethylenediamine N,N',N′-triacetic acid or a salt thereof (HEDTA) and wherein, in a next step, in the outlet streams from the subterranean formation the aqueous phase is separated from the non-aqueous phase.