... interface procedure drillstem/well testing rig horizontal tree system drillstem testing upstream oil & gas horizontal tree plug completion equipment valve riser control system horizontal subsea tree installation well control intervention subsea system shasta tree...

... installation subsea system hanger wireline plug application horizontal subsea tree interface valve tree cap connector conventional subsea tree spool body electrical receptacle wellhead upstream oil & gas subsea tree operation external tree cap horizontal tree subsea bop...

.... This paper compares both conventional and horizontal subsea tree concepts, illustrates system advantages/imitations, and presents some of the pressing operating practice issues so that informed choices, both technically and economically, can be made with regard to using a horizontal tree. BACKGROUND...