초록 ▼

A column of drill collars have holes or jets extending radially from the collar bore through the collar wall. A wash pipe extends full length through the bore of the perforated collars, so sized as to leave an annular flow space between the wash pipe and the collar bore wall. A remote control select

A column of drill collars have holes or jets extending radially from the collar bore through the collar wall. A wash pipe extends full length through the bore of the perforated collars, so sized as to leave an annular flow space between the wash pipe and the collar bore wall. A remote control selector valve is situated such as to receive drilling fluid from the upwardly continuing drill string and direct the fluid through the wash pipe to the drill bit for regular drilling, or on cue from the earth surface, direct fluid to the annulus to be expelled through the drill collar perforations to help free stuck pipe or to prevent such sticking.

대표청구항 ▼

In a well drilling system having a string of drill pipe suspended in a well bore and means, at the earth surface, to force and control the flow of drilling fluid downwardly through the drill string bore, apparatus comprising: (a) A body to perform as a drill string interval, with an upper and a lowe

In a well drilling system having a string of drill pipe suspended in a well bore and means, at the earth surface, to force and control the flow of drilling fluid downwardly through the drill string bore, apparatus comprising: (a) A body to perform as a drill string interval, with an upper and a lower end, comprising; an outer tube with end terminals, each having means to attach with fluid tight engagement to the continuing drill string, an inner tube generally coaxial, for some length, with said outer tube, and an annular space between said coaxial tube walls; (b) means, situated in said body, responsive to fluid flow controlled signals, generated at the earth surface, to produce a first output signal in response to said signals of a first characteristic and responsive to said signals of a second characteristic to produce a second output signal; (c) fluid flow channel selector means, situated in said body, responsive to said first output signal to provide a fluid flow channel from the upwardly continuing drill string to the downwardly continuing drill string and responsive to said second output signal to provide a fluid flow channel for at least part of said fluid flow from the upwardly continuing drill string to said annular space; (d) surfaces describing at least one hole through the wall of said outer tube.