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A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubing head spool for use with the casi

A casing mandrel for an independent screwed wellhead includes a pin thread adapted for engagement with a box thread of a well stimulation tool lockdown nut for securing the well stimulation tool against the casing mandrel top end. A well stimulation tool and a tubing head spool for use with the casing mandrel are also provided.

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We claim: 1. 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

We claim: 1. 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. 2. The method as claimed in claim 1 further comprising: lubricating a perforating gun into the casing of the well; perforating the casing to provide fluid communication with a production zone of the well; and lubricating the perforating gun out of the casing of the well. 3. The method as claimed in claim 2 further comprising flowing back high pressure well stimulation fluids after the high pressure well stimulation fluids have been pumped into the production zone. 4. The method as claimed in claim 3 further comprising determining whether a last production zone of the well has been stimulated. 5. The method as claimed in claim 4 wherein if the last production zone of the well has not been stimulated, the method further comprises: lubricating in an isolation plug to isolate stimulated production zones from production zones that have not been stimulated. 6. The method as claimed in claim 5 further comprising: lubricating a perforating gun into the casing of the well; perforating the casing to provide fluid communication with a production zone that has not been stimulated; and lubricating the perforating gun out of the casing of the well. 7. The method as claimed in claim 6 further comprising flowing back high pressure well stimulation fluids after the high pressure well stimulation fluids have been pumped into the production zone that had not been stimulated. 8. The method as claimed in claim 7 further comprising removing the well stimulation tool and mounting a tubing head spool to the casing mandrel. 9. The method as claimed in claim 8 further comprising running production tubing into the well. 10. The method as claimed in claim 9 further comprising mounting a tubing mandrel to the production tubing and landing the tubing mandrel in a tubing mandrel bowl of the tubing head spool. 11. The method as claimed in claim 10 further comprising mounting flow control equipment to a top of the tubing mandrel. 12. A method of preparing a well equipped with an independent screwed wellhead for production, comprising: installing a casing mandrel that supports a production casing 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 well fracturing assembly to the well stimulation tool and connecting high pressure fracturing lines to the well fracturing assembly to permit well stimulation fluids to be pumped through the production casing into a production zone of the well. 13. The method as claimed in claim 12 further comprising: lubricating a perforating gun through the well fracturing assembly into the production casing of the well; perforating the production casing to provide fluid communication with the production zone of the well; and lubricating the perforating gun out of the production casing of the well through the well fracturing assembly. 14. The method as claimed in claim 13 further comprising pumping high pressure well stimulation fluids through the well fracturing assembly and the production casing into the production zone of the well. 15. The method as claimed in claim 14 further comprising flowing back high pressure well stimulation fluids after the high pressure well stimulation fluids have been pumped into the production zone of the well. 16. The method as claimed in claim 15 further comprising removing the well fracturing assembly and the well stimulation tool and mounting a tubing head spool to the casing mandrel. 17. The method as claimed in claim 16 further comprising running production tubing into the well. 18. The method as claimed in claim 17 further comprising mounting a tubing mandrel to the production tubing and landing the tubing mandrel in a tubing mandrel bowl of the tubing head spool. 19. The method as claimed in claim 18 further comprising mounting flow control equipment to a top of the tubing mandrel. 20. A method of preparing a well equipped with an independent screwed wellhead for production, comprising: installing a casing mandrel that supports a production casing 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 fracstack to the well stimulation tool and connecting high pressure fracturing lines to the fracstack to permit well stimulation fluids to be pumped through the fracstack and the production casing into a production zone of the well.