Cangzhou High Booming Pipe Equipment Co.,Ltd
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20'' casing is always used as Surface Casing Pipe in a oil well completion and steel grade generally chosen
J55 or K55 , ERW and Seamless both applicable.
Surface Casing pipe is installed to :
1 prevent poorly consolicated shallow formations from sloughing into the hole
2 protect fresh water sands from contamination by drilling mud
3 provide protection against hydrocarbons found at shallow depths
4 provide initial support for the blowout preventers
5 support the wellhead system and all subsequent casing strings
The main size of 20'' is as below:
OD WT(MM) KG/M PPF Length (M) Threads
20''/508mm 11.13 139.89 94 R3/R2 BTC/STC/LTC
20''/508MM 12.70 158.49 106.50 R3/R2 BTC/STC/LTC
20''/508MM 16.13 197.93 133.00 R3/R2 BTC/STC/LTC
There are also other sizes which can be used as Surface Casing Pipe such as 16'', 13-3/8'' etc. It is commonly based on the
well designs and technical requirements.
shipment by bulk vessle