Combination of upper pipe drilling with control pressure and drilling with underwater mud crane

摘要

A device includes a tube having at least one vent and a tube in the tube. The device includes a valve that selectively connects the path to a fluid return line and to the input of a fluid pump. The device also includes a valve selectively connecting the pump output to the fluid return line and closing the pump output. One way is to pump mud back from the well2. Riser from well to water surface drilling device. The liquid from the upper pipe is selectively transferred to the inlet of a liquid pump or the mud recovery line from the pipe to the drilling device. When the flow is transferred to the mud return, the liquid flow of the upper pipe will stop on the pipe. When the water flow is turned to the inlet of the pumpThe operation of the pump is to raise the mud to maintain the selected mud pressure.