CN112253035A
|
|
Well drilling blowout prevention structure and device thereof
|
CN111894466A
|
|
Roller bit for petroleum exploration and exploitation
|
CN111894465A
|
|
Screw drill bit structure for oil development
|
CN111894481A
|
|
Anti-falling structure of screw drill
|
CN111894467A
|
|
Natural gas is opened and is adopted screw drill
|
CN111894483A
|
|
High-strength screw drill
|
CN109779554A
|
|
A kind of screw rod power device for Sand pump
|
CN109750990A
|
|
A kind of ultra-fine helicoid hydraulic motor
|
CN108678660A
|
|
Underground oil reservoir pries into gaging hole bolt special drilling tool
|
CN108590575A
|
|
A kind of wellhead safety anti-theft plug valve
|
CN108716380A
|
|
The safe top opening of drilling tool check valve
|
CN108661549A
|
|
A kind of heat-insulated good air screw rod drill tool
|
CN107178309A
|
|
A kind of multi-stage diffluence foam screw drill
|
CN107255016A
|
|
One kind can adjust hollow shunting screw drill
|