| abstract |
Method and apparatus for emplacing a bridge plug through tubing in a well penetrating subterranean formations characterized by the following plurality of steps, without requiring removal of the tubing. A dump bailer containing cement slurry and a covered fabric bag and locking dogs are run downwardly through tubing to the predetermined depth. Dogs are released for holding. A cover is lifted from around the fabric bag, and the cement slurry is dumped via a collapsible fill tube to fill the bag to expand it outwardly into contact with the casing. The dump bailer and cover tube are removed from the well. A supplemental batch of cement slurry is dumped on the top of the bag of cement slurry. An open passageway is provided through the bag of cement and the supplemental batch of cement slurry during curing. The open passageway is closed. Finally, if desired, additional cement slurry is dumped onto the set bridge plug and allowed to set. Also disclosed are specific structure of the various means for carrying out the functions implicit in the steps; as well as operational details and structure. |