APPAREIL DESTINÉ À GÉNÉRER DES IMPULSIONS DANS UN FLUIDE LORS DU FORAGE DE PUITS

摘要

An apparatus for use in a drilling assembly (190) comprises a flow control device (185, 200, 300) that includes: a fluid flow path (232, 322); a movable member (240, 330) made from a magnetic material, the movable member (240, 330) comprising a closing member (240, 329) and being configured to move the closing member (240, 329) between an open position and a closed position, to close the fluid flow path (232, 322) when the closing member (240, 329) is in the closed position; a magnetic member and a coil (260, 350); wherein when the coil (260, 350) is energized, a magnetic flux (270, 370) is formed in the magnetic member, the movable member (240, 330) and a gap between the magnetic member and the movable member (240, 330), the magnetic flux causes the movable member (240, 330) to close the gap and the closing member (240, 329) to move from the open position to the closed position to close the fluid flow path (232, 322) to produce a pressure pulse in a fluid (131) flowing through the fluid flow path (232, 322).