One well bore can exploit two different strata at the same time, and can control and operate separately. Dedign with assembing The wellhead consists of the casing head,tubing head and christmas tree.The main technical specifications:1, W.P.:2000Psi~20000Psi 2, Medium:Oil,Gas,Mud3, T.C.:-46°C~121°C(L.U)4, M.C.:AA,BB,CC,DD,EE,FF5, PSL:PSL1~PSL46, PR:PR1~ PR2