Pipe joints or couplings – Safety release – With frangible or deformable element
Patent
1989-10-03
1990-11-20
Novosad, Stephen J.
Pipe joints or couplings
Safety release
With frangible or deformable element
166301, 166317, 285 3, 285 81, E21B 2300, E21B 3100, F16L 2712
Patent
active
049713655
ABSTRACT:
A hydraulic safety joint for use in a downhole tool string. The hydraulic safety joint includes a mandrel assembly slidably disposed in a case assembly such that a chamber is defined therebetween. The chamber is filled with a volume of fluid so that the mandrel is held in a first operating position. When in this first position, the mandrel is in splined engagement with a nipple at the lower end of the case assembly. Upon application of a predetermined tensile load on the tool string, a rupture disc in communication with the fluid chamber is ruptured so that the fluid is vented therefrom. When the pressure is thus released, the mandrel assembly is moved to a second position in which it is further extended from the case assembly. In this position, the mandrel assembly is no longer in splined engagement with the nipple, but a series of lugs prevents relative rotation between the mandrel assembly and an upper portion of the case assembly. The tool string may then be rotated to break the threaded connection between the nipple and the rest of the case assembly so that the tool string components above the nipple may be removed from the well bore.
REFERENCES:
patent: 2585995 (1952-02-01), Brown
patent: 3368829 (1968-02-01), Barrington et al.
patent: 3842914 (1974-10-01), Mott
patent: 3963228 (1976-06-01), Karle
patent: 4054040 (1977-10-01), Medders
patent: 4211290 (1980-07-01), Mason et al.
patent: 4484633 (1984-11-01), Brandell
Halliburton Sales & Service Catalog No. 43, published in 1985, pp. 2539-2540, 2574.
Duzan James R.
Halliburton Company
Kennedy Neal R.
Novosad Stephen J.
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