Multi-lock adapters for independent screwed wellheads and methods of using same
AssigneeStinger Wellhead Protection, Inc.
InventorsBob McGuire, L. Murray Dallas
Life of this patent
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Abstract
A multi-lock adapter used to inject high-pressure well stimulation fluids through an independent screwed wellhead includes an adapter pin having a central passageway with an internal diameter at least as large as a passageway through the wellhead. A lockdown flange secures the adapter pin to a casing mandrel of the wellhead. The lockdown flange ensures that stress on connection points to the screwed independent wellhead due to elevated fluid pressures used for well stimulation procedures does not exceed engineered specifications.
Claims20
A method of preparing a well equipped with an independent screwed wellhead for a well stimulation procedure, comprising:
- mounting a lockdown flange to the independent screwed wellhead using a bottom lockdown nut to secure the lockdown flange to the independent screwed wellhead;
- inserting a flanged adapter pin through the lockdown flange, and rotating the flanged adapter pin to engage a pin threaded nipple on a bottom end of the flanged adapter pin with top box threads of a casing mandrel;
- and
- securing the flanged adapter pin to the lockdown flange using a top lockdown nut.
A method of preparing a well equipped with an independent screwed wellhead for a well stimulation procedure, comprising:
- securing a threaded adapter pin to top box threads of a casing mandrel supported by the independent screwed wellhead;
- placing a pancake gasket on a top end of the threaded adapter pin;
- lowering a lockdown flange over the pancake gasket and the top end of the threaded adapter pin;
- and
- securing a lockdown nut supported by the lockdown flange to a pin thread on an outer periphery of the independent screwed wellhead.
A method of preparing a well equipped with an independent screwed wellhead for a well stimulation procedure, comprising:
- securing a threaded adapter pin to top box threads of a casing mandrel supported by the independent screwed wellhead;
- rotating a pin sleeve that threadedly engages pin threads on an outer periphery of a lower end of the threaded adapter pin until a bottom end of the pin sleeve makes secure contact with a top of the casing mandrel;
- lowering a lockdown flange over the top end of the threaded adapter pin and the pin sleeve;
- and
- securing a lockdown nut supported by the lockdown flange to a pin thread on an outer periphery of the independent screwed wellhead.
Dependencies are inferred from the claim text.