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:
Aug. 20, 1996
Filed:
Jul. 09, 1992
Applicant:
Inventors:
Herve Perthuis, Saint Etienne, FR;
Jean-Pierre Feraud, Tulsa, OK (US);
Philippe Dejeux, St Priest En Jarez, FR;
Pierre Maroy, Saint Galmier, FR;
Assignee:
Dowell, a division of Schlumberger Technology Corporation, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
507258 ; 507933 ;
Abstract
The invention relates to iron control in an acid medium for forestalling the formation of precipitates known as 'sludges' (asphaltic products) in contact with certain crude oils. Use is made of compounds comprising a mercaptan function non miscible in water and, in combination, a selection of catalysts. Application to acid treatments for oil, gas, water, geothermal and analogous wells, as well as to industrial cleaning.