What is the role of wellhead in oil drilling and production？

　　Wellhead equipment is generally composed of casing head, tubing head and BOP group.
　　The function of wellhead equipment in drilling and production is to control the pressure and direction of gas and liquid.
　　Among them, the casing head is mainly used to connect each layer of casing and reservoir casing, and seal the annulus between the two layers of casing.
　　The tubing head is mainly used to hang the running tubing and seal the annular space of tubing and casing.
　　As a manufacturer of wellhead equipment, organize production orders for production wellhead equipment and gas wellhead.

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