Coring assembly and method

Details Coring assembly and method Coring assembly and method

E - Fixed Constructions

21

B

E21B 25/00 (2006.01) E21B 25/02 (2006.01) E21B 49/02 (2006.01)

Patent

CA 2170597

Coring apparatus (10) and method are disclosed which provide for hydraulic latching of an inner core barrel (26) within an outer core barrel (12). The apparatus includes a valve face (48) disposed around the inner core barrel (26) and valve seat (52) disposed around the bore of the outer core barrel (12) that close to form a restriction in drilling fluid flow path (54). A hydraulic differential force is thereby created which holds the inner barrel (26) in place. Axially oriented bores (64) in a hanger assembly (58) and in stabilizers (62) ace disposed along the inner core barrel (26) to provide a flow path for the drilling fluid after the restriction is formed. The bores are calibrated to produce a pre-determined hydraulic force on the inner barrel (26). A bearing assembly (30) is used to prevent transmission of outer barrel (12) rotation to the inner core barrel (26). The outer surface of the bearing assembly (30) forms the valve face (48) so as to form the drilling fluid restriction and also provides an axial stop that prevents further axial movement of the inner barrel (26) towards the core head (14).

Appareil (10) et procédé de carottage permettant d'accrocher hydrauliquement un tube carottier interne (26) dans un tube carottier externe (12). L'appareil comprend une tête (48) de soupape située autour du tube carottier interne (26) et un siège (52) de soupape placé autour du trou de tube carottier externe (12), qui se ferment pour former un étranglement dans le trajet d'écoulement (54) du fluide de forage, ceci ayant pour effet de créer une force différentielle hydraulique qui maintient en place le tube carottier interne (26). Des trous (64) orientés axialement formés dans un ensemble suspenseur (58) et dans des stabilisateurs (62) sont disposés le long du tube carottier interne (26) pour permettre au fluide de forage de s'écouler après la formaton de l'étranglement. Les trous sont calibrés de manière à produire une force hydraulique prédéterminée sur le tube carottier interne (26). Un ensemble palier (30) sert à empêcher le tube carottier externe (12) de transmettre sa rotation au tube carottier interne (26). La surface externe de l'ensemble palier (30) forme la tête (48) de soupape de manière à produire l'étranglement dans le passage du fluide de forage et constitue également une butée axiale qui empêche le tube carottier interne (26) de se déplacer axialement vers la couronne (14) du carottier.

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