Centralizer assembly of underbalanced drilling deflector

Underbalanced drilling deflector

Plate valve opening indicator

Improved rod sealing device for flat valve

Rod sealing packing of flat valve

Bearing assembly of rotary assembly of environmental protection closed rotary BOP

Lubricating oil inlet device for rotary assembly of environmental protection closed rotary BOP

New rubber core of environmental protection closed rotary BOP

Lower sealing body of environmental protection closed rotary BOP

Upper sealing body of environmental protection closed rotary BOP

New drive for offshore drilling

New sealer for offshore drilling