Patent ID: 9556697
Date: 2017-01-31
CPC Classifications: E21B

Claim:
1. A method for installing upon a conductor pipe, having an interior diameter, a conductor pipe upper end, and a conductor pipe lower end extending into a ground surface, a wellhead system for supporting at least one section of a casing in a borehole to be drilled onshore into the ground surface, comprising: lowering a wellhead housing on top of the conductor pipe upper end and welding the wellhead housing to the conductor pipe upper end, the wellhead housing having a wellhead housing upper end, a wellhead housing lower end, a wellhead housing central interior bore extending between the wellhead housing upper end and the wellhead housing lower end, and the wellhead housing upper end having an annular flange member, the wellhead housing central interior bore having a diameter that is smaller than the interior diameter of the conductor pipe; securing a blowout preventer, having a blowout preventer upper end and a blowout preventer lower end, to the annular flange member of the wellhead housing upper end; the blowout preventer having a blowout preventer central interior bore extending between the blowout preventer upper end and the blowout preventer lower end, and the blowout preventer central interior bore having a diameter which is less than the interior diameter of the conductor pipe; drilling a first borehole, adjacent to and in a spaced relationship from, the conductor pipe, after the wellhead housing has been welded to the conductor pipe and conducting the drilling through the blowout preventer central interior bore and the wellhead housing central interior bore; suspending a first section of casing from the wellhead housing into the first borehole; drilling a second borehole adjacent to, and in a spaced relationship from, the first section of casing; and suspending a second section of casing from the wellhead housing into the second borehole.