Electronically-actuated cementing port collar

摘要

A cementing port collar has an opening sleeve biased from a closed position to an opened position relative to the collar's exit port, and a first restraint temporarily holds the opening sleeve closed. The collar also has a closing sleeve biased from an opened position to a closed position, and a second restraint temporarily holds the closing sleeve opened. During cementing, the first restraint is electronically activated with a first trigger to release the opening sleeve opened so cement slurry can pass out of the collar's exit port to the borehole annulus. When cementing is completed, the second restraint is electronically activated with a second trigger to release the closing sleeve closed to close off the collar to the borehole so the cement can set. The restraints can include bands of synthetic fiber, which are burned by fuses activated by a controller of the collar responding to passage of RFID tags.

主权项

1. A port collar for use on casing in a borehole, the port collar comprising:
a housing disposed on the casing and having an internal bore, the housing having at least one exit port communicating the internal bore with the borehole; an opening valve disposed on the housing and being biased from a closed position to an opened position relative to the at least one exit port; a first restraint temporarily holding the opening valve in the closed position, the first restraint electronically activated with a first trigger and releasing the opening valve biased to the opened position when activated; a closing valve disposed on the housing and being biased from an opened position to a closed position relative to the at least one exit port; and a second restraint temporarily holding the closing valve in the opened position, the second restraint electronically activated with a second trigger and releasing the closing valve biased to the closed position when activated.