Inventor
NELSON ROY N
US4 patents
Patents
4 patentsUS9027651B2May 12, 2015
Barrier valve system and method of closing same by withdrawing upper completion
FRISBY RAYMOND A4 citations67
US9016372B2Apr 28, 2015
Method for single trip fluid isolation
FRISBY RAYMOND A0 citations46
US9016389B2Apr 28, 2015
Retrofit barrier valve system
FRISBY RAYMOND A1 citations46
US9828829B2Nov 28, 2017
Intermediate completion assembly for isolating lower completion
FRISBY RAYMOND A0 citations36