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. 21, 2024
Filed:
Jun. 16, 2021
Applicant:
Dynaenergetics Europe Gmbh, Troisdorf, DE;
Inventors:
Joern Olaf Loehken, Troisdorf, DE;
Stefan Purcelean, Troisdorf, DE;
Paula Feitoza Nascimento, Troisdorf, DE;
Bernd Fricke, Hannover, DE;
Assignee:
DynaEnergetics Europe GmbH, Troisdorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 34/06 (2006.01); E21B 43/117 (2006.01); E21B 43/1185 (2006.01);
U.S. Cl.
CPC ...
E21B 34/063 (2013.01); E21B 43/117 (2013.01); E21B 43/11855 (2013.01);
Abstract
A dynamic underbalance sub for use in a wellbore may include a sub housing, a first chamber provided in an interior of the sub housing, an opening extending through the sub housing and configured such that the first chamber is in fluid communication with an exterior of the sub housing, a second chamber provided in the interior of the sub housing, and a pressure-isolating wall provided between the first chamber and the second chamber.