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:
Oct. 26, 1999
Filed:
Nov. 06, 1995
Jean-Pierre Feraud, Tulsa, OK (US);
Herve Perthuis, Saint Etienne, FR;
Philippe Dejeux, Saint Priest en Jarez, FR;
Pierre Maroy, Saint Galmier, FR;
Schlumberger Technology Corporation, Sugar Land, TX (US);
Abstract
In the presence of certain crude oils, when ferric iron exists in very acidic fluid, it practically instantaneously forms precipitates known as sludges which lead to irreversible damage. Iron control compositions and acid fluids containing such iron control compositions are disclosed. For acid fluids containing up to 15% acid, the iron control composition includes a reducing agent selected from a substituted and unsubstituted thiourea compounds, and a reduction catalyst including a copper (cuprous or cupric) compound. When the acid fluid contains more than 15% acid, for example from 15 to 28% acid, the reducing agent is again selected from substituted or unsubstituted thiourea compounds, and the reduction catalyst is a combination of a copper (cuprous or cupric) compound and iodine (iodine or iodide ions). The invention also includes a process for treatment of oil, water, gas, geothermal or analogous wells using an acid fluid containing an iron control composition according to the present invention, and an industrial cleaning process using a cleaning fluid including an acid fluid containing an iron control agent according to the present invention.