Casing pipe is a kind of large diameter pipes .It has fixed the role for the oil and gas casing and hole. The casing pipe is inserted into the hole and fixed with cement, in order to ensure the drilling mud circulating flow and prevent the borehole and separated strata borehole collapse .
In oil production process using different types of casing:
Provide blowout protection,isolate water sands,and prevent lost circulation;
Support the wellhead equipment and keep the other layer weight of the casing.
Separation the pressure for different levels,in order to the drilling fluid lines normal circulation and production casing;
In order to complete installation reverse blowout device,drilling blowout preventer and the tail pipe.