Our company produce blowout preventers and hydraulic control systema,which can meet the pueposes of well drilling,underbalanced drilling, undergroude operation, non-killing well pressurized operations,etc. with a fall range of specifications bore sizeds formØ52-Ø540(21/16in-211/4in).pressure rating from 7Mpa to 105Mpa (1000psi-15000psi).the h2s resistance perfomrmance complies with NACE Mr-0175:2003 requirements. it is can applied to oil extraction,perforation,test, operation, pressurized and underbalanced drilling.