US 7,594,542 B2
Alternate path indexing device
Yves Loretz, Houston, Tex. (US); Donald Ross, Houston, Tex. (US); and David J. Reed, Houston, Tex. (US)
Assigned to Schlumberger Technology Corporation, Sugar Land, Tex. (US)
Filed on Apr. 28, 2006, as Appl. No. 11/380,769.
Prior Publication US 2007/0251697 A1, Nov. 01, 2007
Int. Cl. E21B 34/10 (2006.01)
U.S. Cl. 166—320  [166/331; 166/375] 20 Claims
OG exemplary drawing
 
15. A choke assembly, the assembly comprising:
a valve; and
a mechanical indexer device in operational connection with the valve, the indexer device including an indexing pattern and a detent moveable along the indexing pattern, the indexing pattern having a primary path in a first circumferential direction defining a sequence through a plurality of valve positions at and between open and closed and at least one alternate path in a second circumferential direction from a point along the primary path to a preceding position on the primary path along the sequence.