Patent ID: 7422070

Claim:
A method of preparing a well equipped with an independent screwed wellhead for production, comprising: installing a casing mandrel in the independent screwed wellhead using a lockdown nut, the casing mandrel having a casing mandrel top end that includes a pin thread located above a top of the lockdown nut; securing a well stimulation tool to the casing mandrel top end using a lockdown nut with a box thread that engages the pin thread on the casing mandrel top end to lock the well stimulation tool against the casing mandrel top end; and mounting a high pressure valve or a blowout preventer and a blowout preventer protector to the well stimulation tool and connecting high pressure fracturing lines to the high pressure valve or the blowout preventer protector to permit well stimulation fluids to be pumped into a casing of the well.