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A well stimulation tool is connected to a top of a tubing hanger in a well to be stimulated. The well stimulation tool includes an adapter pin that connects to the tubing hanger. The adapter pin is connected to a mandrel that reciprocates through a top end of an adapter spool, which is mounted to a

A well stimulation tool is connected to a top of a tubing hanger in a well to be stimulated. The well stimulation tool includes an adapter pin that connects to the tubing hanger. The adapter pin is connected to a mandrel that reciprocates through a top end of an adapter spool, which is mounted to a tubing head spool that supports the tubing hanger. A high-pressure valve is mounted to a top end of the mandrel. High-pressure fluids are pumped through the high-pressure valve, the mandrel, the adapter pin, the tubing hanger, and a production tubing into the well.

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1. A well stimulation tool for stimulating a well having a tubing head spool and a production tubing suspended from a tubing hanger in the tubing head spool, comprising:an adapter spool having a bottom flange adapted for connection to one of the tubing head spool and a blowout preventer mounted to t

1. A well stimulation tool for stimulating a well having a tubing head spool and a production tubing suspended from a tubing hanger in the tubing head spool, comprising:an adapter spool having a bottom flange adapted for connection to one of the tubing head spool and a blowout preventer mounted to the tubing head spool, and a top end adapted to receive a mandrel that can be reciprocally moved through packing that surrounds the mandrel and is retained in a packing cavity in the top end, the top end further including threads for securing a lockdown nut that covers the packing and surrounds an outer periphery of the mandrel;the mandrel having a mandrel top end and a mandrel bottom end, the mandrel top end having a flange adapted for the connection of a high-pressure valve, and the mandrel bottom end having a thread for the connection of an adapter pin; andthe adapter pin having an adapter pin top end and an adapter pin bottom end, the adapter pin top end having threads for connecting the adapter pin to the mandrel, and the adapter pin bottom end having threads for connecting the adapter pin to a top end of the tubing hanger. 2. A well stimulation tool as claimed in claim 1, further comprising:a high-pressure flange adapted to be mounted to a top of the high-pressure valve, the high-pressure flange having a pressure flange top end and a bottom flange, the bottom flange being adapted for connection to a top flange of the high-pressure valve and the pressure flange top end being threaded for connection of a high-pressure line for injecting high-pressure well stimulation fluids into the well. 3. A well stimulation tool as claimed in claim 1, further comprising a lifting head assembly having a first member that includes a bottom end adapted to be connected to the high-pressure flange, and a second member having means for connecting the lift head to a hoist, in order to permit the well stimulation tool to be lifted for installation on, or removal from, the one of the tubing head and the blowout preventer. 4. A well stimulation tool as claimed in claim 3, wherein the first member comprises a lifting sub having a lifting sub top end, a lifting sub bottom end and a cylindrical side wall that interconnects the lifting sub top end and the lifting sub bottom end, and the second member comprises a lifting head comprising a hollow cylinder having a lifting head top end and a lifting head bottom end, the lifting head bottom end including an aperture; andthe lifting sub top end is received in the hollow cylinder and freely reciprocates therein, but cannot pass through the aperture in the lifting head bottom end, and the lifting sub bottom end is adapted to be connected to the pressure flange top end. 5. A well stimulation tool as claimed in claim 4, wherein the lifting head assembly further comprises a lifting eye affixed to the lifting head top end. 6. A well stimulation tool as claimed in claim 4, wherein the lifting head further comprises opposed, radially extending lift arms adjacent the lifting head bottom end, the lift arms, each including a lift eye located near an outer end thereof. 7. A well stimulation tool as claimed in claim 6, wherein the lockdown nut further comprises opposed, radially extending lift arms, each including a lift eye located near an outer end thereof. 8. A well stimulation tool as claimed in claim 7, further comprising:first and second lifting cables, the first lifting cable having opposed ends respectively connected to a corresponding lift eye in one of the lift arms of the lifting head and a lift eye in one of the lift arms of the lockdown nut, and the second lifting cable having opposed ends respectively connected to a corresponding lift eye in the other of the lift arms of the lifting head and a lift eye in the other of the lift arms of the lockdown nut;whereby when the well stimulation tool is lifted using the lifting eye affixed to the lifting head top end, the lifting sub top end moves downwardly within the h ollow cylinder and the lifting cables bear the weight of the lockdown nut and the adapter spool, so that the mandrel is stroked down through the adapter spool and the adapter pin is extended beneath the bottom flange of the adapter spool to permit the adapter pin to be connected to, or disconnected from, the top end of the tubing hanger. 9. A well stimulation tool as claimed in claim 1, wherein the adapter spool further comprises a pressure bleed port. 10. A well stimulation tool as claimed in claim 9, wherein the pressure bleed port is closed by a high-pressure needle valve. 11. A method of stimulating a hydrocarbon well comprising steps of:connecting a well stimulation tool to a top of a tubing hanger in a tubing head spool of the well, the well stimulation tool comprising:an adapter spool having a bottom flange adapted for connection to the tubing head spool, and a top end adapted to receive a mandrel that can be reciprocally moved through packing that surrounds the mandrel and is retained in a packing cavity in the top end, the top end further including threads for securing a lockdown nut that covers the packing and surrounds an outer periphery of the mandrel;the mandrel having a mandrel top end and a mandrel bottom end, the mandrel top end having a flange adapted for the connection of a high-pressure valve, and the mandrel bottom end having a thread for the connection of an adapter pin; andthe adapter pin having an adapter pin top end and an adapter pin bottom end, the adapter pin top end having threads for connecting the adapter pin to the mandrel, and the adapter pin bottom end having threads for connecting the adapter pin to a top of the tubing hanger;mounting a high-pressure valve to the flange at the mandrel top end;connecting a high-pressure line to a top of the high-pressure valve;opening the high-pressure valve; andpumping high-pressure fluid through the high-pressure line to stimulate the hydrocarbon well. 12. A method as claimed in claim 11 wherein, after the step of mounting the high-pressure valve to the flange and before connecting the high-pressure line, the method further comprises steps of:mounting a wireline lubricator to a top of the high-pressure valve;opening the high-pressure valve running in a wireline and retrieving a plug from a production tubing suspended from the tubing hanger;closing the high-pressure valve; andremoving the wireline lubricator. 13. The method as claimed in claim 12, further comprising steps of:closing the high-pressure valve;disconnecting the high-pressure line; mounting the wireline lubricator to the top of the high-pressure valve;running in the wireline to reset the plug in the production tubing;retrieving the wireline;removing the wireline lubricator; andremoving the well stimulation tool and the high-pressure valve from the tubing head spool. 14. The method as claimed in claim 13, further comprising steps of:mounting a wellhead to the tubing head spool;mounting the wireline lubricator to the wellhead; andrunning in the wireline to retrieve the plug. 15. A method of stimulating a hydrocarbon well comprising steps of:assembling a combination of a well stimulation tool and a high-pressure valve, the well stimulation tool comprising:an adapter spool having a bottom flange adapted for connection to a tubing head spool, and a top end adapted to receive a mandrel that can be reciprocally moved through packing that surrounds the mandrel and is retained in a packing cavity in the top end, the top end further including threads for securing a lockdown nut that covers the packing and surrounds an outer periphery of the mandrel;the mandrel having a mandrel top end and a mandrel bottom end, the mandrel top end having a flange adapted for the connection of the high-pressure valve, and the mandrel bottom end having a thread for the connection of an adapter pin;the adapter pin having an adapter pin top end and an adapter pin bottom end, the adapter pin top end having threads for connecting t he adapter pin to the mandrel, and the adapter pin bottom end having threads for connecting the adapter pin to a top of a tubing hanger in the tubing head spool; anda lifting head assembly including a bottom end for connection of the high-pressure valve and a top end with a lifting eye to permit the well stimulation tool to be lifted for mounting to the tubing head spool;hoisting the combination of the well stimulation tool and the high-pressure valve above the tubing head spool of the well by connecting to the lifting eye;lowering the combination to connect the adapter pin bottom end to the tubing hanger and further lowering the combination to mount the adapter spool to the tubing head spool; andconnecting a high-pressure line to the high-pressure valve to permit high-pressure fluids to be pumped into the hydrocarbon well. 16. The method as claimed in claim 15, wherein prior to connecting the high-pressure line, the method further comprises steps of:disconnecting the lifting head assembly from the high-pressure valve and the adapter spool after the adapter pin is connected to the tubing hanger and the adapter spool is mounted to the tubing head spool; andremoving the lifting head assembly from the high-pressure valve. 17. The method as claimed in claim 16, further comprising steps of:mounting a wireline lubricator to a top of the high-pressure valve;opening the high-pressure valve;running in a wireline and retrieving a plug from the production tubing;closing the high-pressure valve; andremoving the wireline lubricator. 18. The method as claimed in claim 17, further comprising steps of:closing the high-pressure valve;disconnecting the high-pressure line;mounting the wireline lubricator to the top of the high-pressure valve;opening the high-pressure valve;running in the wireline to reset the plug in the production tubing;retrieving the wireline;removing the wireline lubricator; andremoving the combination of the well stimulation tool and the high-pressure valve from the tubing head spool. 19. The method as claimed in claim 18, further comprising steps of:mounting a wellhead to the tubing head spool;mounting the wireline lubricator to the wellhead; andrunning in the wireline to retrieve the plug. 20. The method as claimed in claim 18, wherein the removal of the combination of the well stimulation tool and the high-pressure valve comprises steps of:hoisting the lifting head assembly back on the high-pressure valve;connecting the first member of the lifting head assembly to the high-pressure valve and connecting the second member of the lifting head assembly to the adapter spool;disconnecting the adapter spool from the tubing head spool;lifting the lifting head assembly to expose the adapter pin;disconnecting the adapter pin bottom end from the tubing hanger; andremoving the combination of the well stimulation tool and the high-pressure valve.