Patent · US Active

Dynamic underbalance sub

US11988066B2 · kind B2 · utility

1Cited by

38References

19Claims

0Family size

Assignee

DynaEnergetics Europe GmbH · DE

Inventors

Joern Olaf Loehken · Troisdorf, DE
Stefan Purcelean · Troisdorf, DE
Paula Feitoza Nascimento · Troisdorf, DE
Bernd Fricke · Hannover, DE

Key dates

Filing date	Jun 16, 2021
Grant date	May 21, 2024
Priority date	—
Expiry date	Jun 16, 2041

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B43/11855
WIPO fieldCivil engineering
WIPO sectorOther fields

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.

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