Wellhead Equipment

All air and gas drilling operations require the use of a rotating head (or similar air or gas flow diverter) which is installed below the rotary table. The blowout preventer (BOP) stack is always used when subsurface overpressured dangerous gases or fluids might be encountered while drilling (i.e., oil and natural gas drilling operations, and geothermal drilling operations). Figure 2-7 shows schematics of three typical wellhead assemblies for double and triple drilling rigs set up for air and gas drilling operations to recover oil and natural gas, or geothermal fluids [6].

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Type 2

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