Folding ultrasonic borehole imaging tool

Details Folding ultrasonic borehole imaging tool Folding ultrasonic borehole imaging tool

E - Fixed Constructions

21

B

E21B 47/01 (2006.01)

Patent

CA 2723656

A borehole logging tool (10) includes a housing (70, 72) oriented along a longitudinal axis (68), and a centralizer assembly that positions the housing (70, 72) substantially at the center of the borehole (12). In one example, the centralizer assembly includes a plurality of centralizer arms (54) radially extendable outward from the longitudinal axis (68). The borehole logging tool (10) further includes a scanning head (60) that rotates a plurality of scanning sensors (20, 22) axially within the borehole (12) about the longitudinal axis (68). The scanning head (60) further includes a plurality of linkage arms (86, 88) coupled to the plurality of scanning sensors (20, 22) such that the scanning sensors (20, 22) are radially extendable outward from the longitudinal axis (68). The borehole logging tool (10) further includes an extension assembly adapted to substantially concurrently control the radial extension of the centralizer arms (54) and the plurality of sensors (20, 22).

Un outil de diagraphie pour forage (10) inclut un logement (70, 72) orienté le long d'un axe longitudinal (68), et un ensemble centreur qui positionne le logement (70, 72) essentiellement au centre du puits de forage (12). Dans un modèle, l'ensemble centreur inclut plusieurs bras centreurs (54) se prolongeant vers l'extérieur de manière radiale à partir de l'axe longitudinal (68). L'outil de diagraphie pour forage (10) inclut aussi une tête de balayage (60) qui fait tourner plusieurs capteurs de balayage (20, 22) de manière axiale dans le puits de forage (12) autour de l'axe longitudinal (68). La tête de balayage (60) inclut aussi plusieurs bras oscillants (86, 88) couplés aux capteurs de balayage (20, 22)de façon que ceux-ci (20, 22) puissent se prolonger vers l'extérieur de manière radiale à partir de l'axe longitudinal (68). L'outil de diagraphie pour forage (10) inclut aussi une ensemble de rallonge adapté pour, essentiellement, commander simultanément la rallonge radiale des bras centreurs (54) et les capteurs de balayage (20, 22).

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