jobs on oil and gas rigs

jobs on oil and gas rigs

Ledge is outspread stabler, ledge is overall the tendency 89 ° , obliquitous 2 ° of 1 ° , use advocate smooth Dong + inclined ramp develops way.

2 meters.

The article analysed the structural problem of the common oil well pump that make a tube, improved ball valve and valve base composition, designed new-style help up implement, make system of lever pump oil extraction applies successfully in big rake well.

Use expand black lead filling is sealed, because pressure is higher, the sealing of filling is poor, leakage rate is old, caused desalination water to be wasted in great quantities, and change filling is more difficult.