1, casing heads should be installed in oil and gas wells, and sulfur-resistant casing heads should be used in natural gas wells containing hydrogen sulfide, and the pressure level should be equal to or greater than the highest formation pressure.

2. The combination of BOPs shall be selected according to the pressure and formation characteristics, and the pressure grade and combination form of choke manifold and kill manifold shall be matched with the blowout preventer of the whole well.