Production actuated mud flow back valve

Details Production actuated mud flow back valve Production actuated mud flow back valve

2006-12-22

2008-12-23

Wright, Giovanna C (Department: 3672)

Wells

Processes

Placing or shifting well part

C166S332100, C166S334400

Reexamination Certificate

active

07467664

ABSTRACT:
A material that reacts to produced hydrocarbons acts as a latch to retain a stored potential energy force. In a specific application, a sliding sleeve valve is held away from a circulating port to allow drilling mud to be circulated out. Later, when the well is put on production, the lock that holds collets in a groove releases as exposure to produced hydrocarbons at a retaining sleeve makes it get soft. This, in turn, allows a spring force to run the collets out of their groove and straddle the circulation port between two o-rings on the shifting sleeve to close the port. The closure of the port directs produced hydrocarbons to screens that had been bypassed when mud was circulated out due to ports being the path of least resistance.

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http://www.alchemycastings.com/lead-products/fusible.htm.
http://www.solders.com/low—melt—alloys.htm.

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