The first is a sleeve and a variety of wellhead unit of a part.   To support the technology and the gravity oil, seal the layers between the annular space for installing anti-injection. Tree lines and oil wells such as Upper unit provides transition connection, and through the sleeve on the body and two side ports, and can be crowded with cement, and monitoring wells sunk and note balance job, etc.1. Under the head tube connection can be a standard circle API threaded sleeve nut connections or standard offset API ladder set of pipe thread connections, and can be welded sleeve is connected to it, and the W-connection .2. There is a side export pipeline threaded and voluntary population-two. Still, there is a processing-side port R 1/2, the valve threads.