| 摘要 |
Float equipment for well operations including float collars and plugs for use therein. In one embodiment a plug has a plurality of modular members so that a plug of desired dimensions and materials can be custom assembled for a particular job. Such a plug may include a plurality of modular wipers and spacers connected together with a plug top and a plug bottom with adhesives or connection means or both. Not only can such connection means provide an antirotation effect between adjacent plug components, but also combinations of lugs and recesses can achieve this. Also a plug is taught which can have a cavity therein with pieces of material for enhancing a plug's drillability. A float collar is disclosed which in one embodiment has a seal plate which sealingly contacts an interior collar wall, which is configured to produce high friction between it and a correspondingly formed plug bottom for an enhanced antirotation effect, and which has gaps for permitting fluid trapped between the collar and plug to flow down into the collar's central bore. A plug is disclosed having a body, wiper means, and a cavity therein containing pieces of material for enhancing plug drillability. A plug is disclosed which has a body member and a cavity therein with pieces of material therein for enhancing the plug's drillability.
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