Wellhead isolation tool and method of using same

Details Wellhead isolation tool and method of using same Wellhead isolation tool and method of using same

E - Fixed Constructions

21

B

E21B 43/25 (2006.01) E21B 17/10 (2006.01) E21B 33/068 (2006.01)

Patent

CA 2299683

A wellhead isolation tool permitting a high fluid flow rate during a well treatment to stimulate production is described. The wellhead isolation tool includes a mandrel to be inserted into a wellhead. The mandrel is sealed in a tubing hanger above back pressure valve threads to isolate the pressure sensitive components of the wellhead from fluid pressure used in the well treatment, and has a lower section extending past the back pressure valve threads and tubing threads into the tubing to protect the threads from washout. The mandrel is locked down with a mechanical lockdown mechanism having a broad range of adjustment. The advantages are that no special tubing hanger is required for use with the mandrel, and a fluid flow rate enabled by the tool during the well treatment is significantly higher than a fluid flow rate enabled with conventional wellhead isolation tools.

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