Patent · US Active

Backflow prevention assembly for downhole operations

US10443351B2 · kind B2 · utility

0Cited by

7References

18Claims

0Family size

Assignee

Baker Hughes, a GE company, LLC · US

Inventors

Jannik P. Hartmann · North Hills, US
Matthias Gatzen · Altwarmbüchen, DE
Thorsten Regener · Celle, DE

Key dates

Filing date	Jul 14, 2016
Grant date	Oct 15, 2019
Priority date	—
Expiry date	Mar 7, 2037

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE21B2200/05
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

Backflow prevention assemblies and methods for downhole systems having outer strings and inner strings include a housing defining a cavity and being part of the outer string, a flow tube disposed between the inner string and the outer string movable axially within the outer string, and a backflow prevention structure having a flapper and a seal seat, the flapper biased toward a closed position and maintained in an open position by the flow tube. The flapper is housed within the cavity when in the open position and the flapper and seal seat form a fluid seal to prevent fluid flow into or through the flow tube when in the closed position. When the flow tube is moved from a first position that maintains the flapper in the open position to a second position, the backflow prevention structure operates to close the flapper and seal the backflow prevention structure.

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