As a result of a variety of reasons causing wellhead gate valve stem fracture, valve plate rust, die off and unable to open, this need to carry out well killing before the replacement work, but this work can't be achieved because there is no passage for circulation.
This technology can drill off flashboard of gas wellhead valves under pressure, and then replace the damaged valves under pressure, or drilling through channel then implement well killing work.
This patent uses fully hydraulic operation to prevent fire, the whole drilling process is carried out under air-tight condition，with high pressure water cooling loop, in order to ensure safety in drilling.
Driven by hydraulic system, the whole drilling process is conducted in air-tight conditions, cooled by high pressure water, which guarantees the operation safety.
The tool Production Standard: API Spec 6A-2004 version .
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