STA type into the tool and the MFH-A-type sealed shell connected to the left thread, the tail pipe can be sent to the design position; in the sit-hanging after the forward buckle, you can feed into the drill pipe and the tail pipe to be cementing Finished, put forward a wellhead. Details STA type into the tool and the MFH-A-type sealed shell connected to the left thread, the tail pipe can be sent to the design position; in the sit-hanging after the forward buckle, you can
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