초록 ▼

A new wellbore cementing system has been developed which includes, in certain embodiments, a plug container with a flow diverter for diverting a portion of flowing fluid away from plugs in the plug container; a plug set system with internal sleeves or dart receivers with shearable parts for shearing

A new wellbore cementing system has been developed which includes, in certain embodiments, a plug container with a flow diverter for diverting a portion of flowing fluid away from plugs in the plug container; a plug set system with internal sleeves or dart receivers with shearable parts for shearing to selectively release plugs--all in certain embodiments made of non-metal material and/or plastic; a swivel equalizer with internal valving to isolate a plug set (or any other item) from torque and to relieve pressure below the swivel equalizer; and unique burst tube systems for selectively controlling fluid flow and plug system operation.

대표청구항 ▼

[ What is claimed is:] [1.] A plug system for wellbore operations comprisinga top plug, comprising a top plug body having a top and a bottom, the top plug body with a fluid flow bore therethrough from top to bottom and a closure sleeve within the fluid flow bore that initially prevents fluid flow th

[ What is claimed is:] [1.] A plug system for wellbore operations comprisinga top plug, comprising a top plug body having a top and a bottom, the top plug body with a fluid flow bore therethrough from top to bottom and a closure sleeve within the fluid flow bore that initially prevents fluid flow through the fluid flow bore, the closure sleeve having a rupture area ruptureable in response to fluid at a minimum rupture pressure so that the introduction of fluid to the top plug at a pressure at least equal to said minimum pressure ruptures the area so that fluid is flowable through the top plug,a bottom plug releasably secured to the top plug, anda swivelling sub sealingly connected to and above the top plug so that the top plug is rotatable with respect to the swivelling sub, the swivelling sub connectible to a wellbore tubular string, the swivelling sub having a bore therethrough for communication with an interior of the tubular string.