Oil well cementing plug are as follows:
1. The balance safa
Cypriot balance is one of the most common methods. The next drill or
tubing to the bottom cement plug design depth, playing after the main cement for water mud, cement pipe enough volume to make the cement plug surface height and slowly pulled out of the column so that the cement plug to stay in meta position, generally from Risse the top surface of 20-30m, flush or reverse circulation. Construction should be noted that under the control of its ring, such as drilling fluid column pressure balance.
2. Preferences act
First in the lower portion of the lower portion of the wellbore is expected to cement plug Yaru been fixed bridge plug. Use dump a certain amount of bottled water slurry, cementing by a cable to the depth, the depth of the current passing through mechanical means or method tilt cylinder switch is turned on, the lift cylinder dumping slurry was poured out.
3. Double safa
The same method as described above is expected to advance into the men under the cement plug bridge plug. And a cementing cementing of two games is similar, but the two games for the drill pipe, the bottom of the column there is a special ring, which can be pulled out from under the stopper inside the drill pipe through the ring, the rubber stopper being plug seat blocked by the Cypriot control slurry reflux. Then put on the drill pipe reverse circulation flushing excess cement and cement tube.
