초록 ▼

A milling system has been invented for milling an opening in a tubular in a tubular string in a wellbore extending down from a surface of the earth, the milling system, in one aspect, has a whipstock connected to an anchor assembly and a mill apparatus releasably connected to the whipstock, the mill

A milling system has been invented for milling an opening in a tubular in a tubular string in a wellbore extending down from a surface of the earth, the milling system, in one aspect, has a whipstock connected to an anchor assembly and a mill apparatus releasably connected to the whipstock, the mill apparatus having auto fill apparatus therein. A mill has been invented with a mill body with a top end and a bottom end, a flow bore through the mill body, and an auto fill apparatus in the flow bore. A valve assembly has been invented for selectively controlling fluid flow through a hollow tubular in a string of hollow tubulars in a wellbore extending from a surface of the earth into the earth, the valve assembly in one aspect having positions limited to at rest, circulate, and anchor set positions so that a fluid pressure indicating at the surface indicates only either a pressured up position for anchor setting or a pressured up position for fluid circulation. A milling system has been invented with apparatus for releasably containing an isolated charge of fluid. A float valve for use in wellbore operations has been invented with a valve member having a vent hole for releasing fluid pressure build up beneath the valve member. A fill sub has been invented which uses such a float valve.

대표청구항 ▼

[ What is claimed is:] [1.] A milling system for milling an opening in a tubular in a tubular string in a wellbore extending down from a surface of the earth, the milling system comprisingan anchor assembly to set the milling system in the tubular,a whipstock connected to the anchor assembly,a mill

[ What is claimed is:] [1.] A milling system for milling an opening in a tubular in a tubular string in a wellbore extending down from a surface of the earth, the milling system comprisingan anchor assembly to set the milling system in the tubular,a whipstock connected to the anchor assembly,a mill apparatus releasably connected to the whipstock, the mill apparatus having auto fill apparatus therein that opens when the milling system is introduced into the wellbore to permit fluid in the wellbore to enter through the mill into the tubular string, anda valve assembly connected at a top end thereof to the tubular string and at a bottom end thereof to the mill apparatus for selectively controlling fluid flow from the surface to the anchor assembly.