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забойный клапан stresses
dril.	downhole deployment valve (DDV Major Tom)
O&G	DDV (downhole deployed valve Шакиров); bottomhole valve (MichaelBurov); bottom hole valve (MichaelBurov); down hole deployment valve; down-hole deployment valve
oil	downhole valve (в скважине)
tech.	bottom-hole valve (в скважине)
забойный клапан DDV™
dril.	DDV (MichaelBurov); downhole deployment valve (MichaelBurov); down-hole deployment valve (MichaelBurov); down hole deployment valve (MichaelBurov)
забойный клапан DDV™
dril.	DDV (MichaelBurov); downhole deployment valve (MichaelBurov); down-hole deployment valve (MichaelBurov); down hole deployment valve (MichaelBurov)
забойный клапан DDVT
O&G	down hole deployment valve; down-hole deployment valve; downhole deployment valve (MichaelBurov)

забойный клапан: 22 phrases in 5 subjects

Oil / petroleum	6
Oil and gas	6
Oil and gas technology	8
Oilfields	1
Well control	1