Article: Fluid-structure interaction in flow induced sealing in wellhead isolation tool.

The wellhead isolation tool (WIT) isolates the wellhead from exposure to treating fluids and pressures. The isolation tool (figure 1) contains a seal element and mandrel that are inserted through the existing wellhead bore and tubing hanger into the production tubing. The seal element and mandrel configuration allow treating fluids to be pumped through the WIT directly into the production tubing. Tubing pressure activates the tool by energizing the sealing element. The simple and economical WIT is ideal for breakdown treatments and fracturing jobs. It is also used to protect the wellhead from high pressure in tubing conveyed perforating situations where pressure actuated ...