Wellhead isolation tool. [For bypassing control head to pressurize production tubing]
Patent
·
OSTI ID:6956262
An apparatus is described for isolating a production tubing string in an oil well from the control head whereby pressures higher than the pressure of the control head may be applied through the production tubing string to the producing formation. The apparatus utilizes an outer housing with a telescoping inner mandrel and seals between. The outer housing is adapted for connection to the control head and the inner mandrel is capable of moving into the control head to make a fluid-tight connection with the production tubing thereby isolating the control head from the higher pressure being applied through the tubing into the formation. The improved apparatus further provides an elongated divergent passage at the lower end of the telescoping inner mandrel for providing a gradual increase in cross sectional area between the interior of the telescoping inner mandrel and the interior of the upper end portion of the production tubing string to reduce turbulence in high pressure fluid passing downward and thereby reduce to a minimum the incidence of erosion of the inner surface of the tubing string adjacent to the sealed connection between the inner mandrel and the tubing string. 8 claims.
- Assignee:
- Halliburton Co.
- Patent Number(s):
- US 4111261
- OSTI ID:
- 6956262
- Country of Publication:
- United States
- Language:
- English
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