Apparatus for controlling inflation fluid to and from inflatable

Details Apparatus for controlling inflation fluid to and from inflatable Apparatus for controlling inflation fluid to and from inflatable

1987-03-03

1988-10-11

Dang, Hoang C.

Wells

Packers or plugs

Expanded by confined fluid from central chamber, pump or...

166106, 166242, E21B 33127

Patent

active

047763965

ABSTRACT:
Apparatus for controlling the flow of inflation fluid to an inflatable packer elements forming part of a drill stem tester, comprises a hydraulically operated piston and adaptor assembly to inflate and deflate the packer elements. The initial flow of inflation fluid into the assembly causes the piston to move upward, aligning a conduit in the piston with a conduit in the adaptor. A valve permits passage of the inflation fluid to the packer elements through the conduit in the piston when the conduit in the piston are in alignment with the conduit in the adaptor. An increase in the pressure of the inflation fluid surrounding the piston causes a second valve in the adaptor to open, thereby allowing the piston to move downward and the pressure fluid from the packer elements to flow to the well bore.

REFERENCES:
patent: 2894585 (1959-07-01), Erwin
patent: 2978046 (1961-04-01), True
patent: 3503445 (1970-03-01), Coehrum et al.
patent: 3941190 (1976-03-01), Conover
patent: 4367794 (1983-01-01), Bednar et al.
patent: 4424860 (1984-01-01), McGill

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