Title: Well bore apparatus with hydraulically releasable tubing seal unit

Abstract: Well bore apparatus is installed in a well casing on a tubular string having a packer anchored in and forming a seal within the casing. In the tubing string above the packer is a safety valve structure held open by the pressure of fluid supplied through control fluid tubing extending to the top of the well between the exterior of the tubing string and the casing. A long tubing seal structure has a lock releasable by the pressure of fluid supplied through the tubing string. The tubing seal structure is released to enable the tubing string to move freely in either direction, in response to pressure and/or temperature changes, whereby tension and compression reversals are eliminated. The tubing string above the sealing receptacle can be pulled from above the packer and other downhole structures. The hydraulic release is operable by fluid pressure to release the receptacle for longitudinal movement relative to a long sealing slick joint.

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Inventors: Oden, Jerome H. (Houston, TX, US)
Swanson, Jr., Roy E. (Sugar Land, TX, US)
Vondall, Ronald J. (Sulphur Springs, TX, US)

Application Number: 936851
Filing Date: 1978-08-25
Publication_date: 1980-02-26
Assignee: Baker International Corporation (Orange, CA)
Primary Class(es): 166/120 166/125, 285/306
Other Classes:
US Patent Ref:

2409811	Oct, 1946	Taylo, Jr. et al.	166/125.
2978032	Apr, 1961	Hanna	166/125.
3008523	Nov, 1961	Clar, Jr. et al.	166/120.
3035642	May, 1962	Page	166/72.
3037797	Jun, 1962	Braun	166/181.
3299959	Jan, 1967	Brown	166/120.
3870104	Mar, 1975	Mott	166/208.
3920075	Nov, 1975	Braddick et al.	166/208.
3934652	Jan, 1976	Cochran	166/208.
4008759	Feb, 1977	Blackwell	166/125.

Other Refs:
Primary Examiner: Leppink, James A.
Assistant Examiner:
Attorney: Subkow and Kriegel