Fluid actuated circulating sub

Details Fluid actuated circulating sub Fluid actuated circulating sub

2011-04-19

2011-04-19

Dang, Hoang (Department: 3672)

Wells

Processes

Operating valve, closure, or changeable restrictor in a well

C166S319000, C166S331000

Reexamination Certificate

active

07926574

ABSTRACT:
A downhole device used to divert fluid flow out of a work string into an annulus. The downhole device is activated by the movement of a plurality of pistons within the downhole device. Fluid flow through a restriction of the downhole device creates an increase in fluid pressure causing the movement of the pistons. The pistons move a flow tube between various locations within the device. In one location, the flow tube prevents fluid flow to the annulus while in another location the flow tube allows fluid flow to be diverted into the annulus. The downhole device may include a locating sleeve having a continuous j-track allowing the flow tube to be selectively retained at the various locations within the downhole device. Fluid flow through the downhole is used to cycle the device between diverting fluid flow to the annulus and forcing fluid flow down the work string.

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Combined Search and Examination Report dated Aug. 1, 2008 for corresponding British Application No. 0808637.3.

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