Wells – Packers or plugs – With expanding anchor
Patent
1977-12-23
1979-12-04
Novosad, Stephen J.
Wells
Packers or plugs
With expanding anchor
166140, E21B 33129
Patent
active
041767152
ABSTRACT:
A well packer has a casing engaging slip mechanism and a packing element carried on a tubular body which is released from the slip assembly enabling setting of the slips and packing by an upward pull on a running in string of pipe. The body and the expander for the slips are locked to hold the packer set. A length of tubing extends through a seal in the body and is released to be slideable in the body enabling temperatue change responsive elongation and contraction of the running pipe, without affecting the packer. A shearable release enables retrieval of the packer assembly by pulling on the running pipe. An emergency release of the running pipe is accomplished by releasing a guide on the end of the slideable tubing.
Well bore packers are frequently used in well casings, with a tubular string of running and retrieving pipe or tubing associated with the packer and held in tension. In the presence of high temperatures, the resultant expansion of the tubing tends to relieve the tubing tension. Temperature variations not only affect the components of the packer assembly but can also cause contraction of the tubing, as well as expansion.
In U.S. Pat. No. 3,256,437, granted June 14, 1966, for "High Temperature Well Packer Apparatus" there is disclosed a packer assembly which is especially adapted or well suited to be used in high temperature well bores, say having temperatures on the order of 400.degree. F. to 700.degree. F. One feature of that prior packer which enables its use in high temperature wells is that a sealed tubing member or "slick" joint extends through the body of the packer and can be released from the body to allow for expansion and contraction of the tubing string. The packing and slick joint seal can be periodically re-tightened to prevent leakage, and the packer assembly is retrievable.
REFERENCES:
patent: 3136365 (1964-06-01), Carter et al.
patent: 3189096 (1965-06-01), Phenix
patent: 3256437 (1966-06-01), Muse
patent: 3289766 (1966-12-01), Bigelow
Bigelow Eugene H.
Goldsmith Burton J.
Baker International Corporation
Novosad Stephen J.
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