A pressure pulse generator

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/18 (2006.01)

Patent

CA 2435790

A pressure pulse generator for use in MWD operations in a drilling installation (10) having a drillstring (11), a drilling bit (19), means (13, 14) for supplying drilling fluid via the interior of the drillstring (11) and to the drilling bit (19), and an annulus (16) between the drillstring (11) and the wall (12) of the borehole which is being formed, said pressure generator being operative to generate a pressure pulse signal in the drilling fluid, and to transmit such signal to pressure monitoring equipment (20, 21) at the surface, and in which the pressure pulse generator comprises: an outer housing (30) which can be mounted in a drillstring component, and in which the operating components of the pulse generator are housed; a main valve (256, 257) having a valve operating chamber which, when the valve is opened, allows drilling fluid to pass from the interior of the drillstring to the exterior, and thereby to generate a pressure pulse signal that will travel to surface; a first pilot valve (116, 120) which is normally open, to allow fluid in the operating chamber of the main valve to communicate with the drilling fluid in the annular; and, a second pilot valve (88, 89, 90) which is normally closed, to control flow of drilling fluid between the inside of the drillstring and the operating chamber of the main valve.

L'invention concerne un générateur d'impulsions de pression utilisable dans des opérations de mesure en cours de forage (MWD) dans une installation de forage (10) comprenant un train de forage (11), un trépan (19), des moyens (13, 14) permettant l'alimentation en fluide de forage via l'intérieur du train de forage (11) jusqu'au trépan (19), et un annulaire (16) entre le train de forage (11) et la paroi (12) du trou de forage en cours de réalisation. Le générateur d'impulsion est conçu pour générer un signal d'impulsion de pression dans le fluide de forage, et pour transmettre ce signal vers un ensemble de mesure de la pression (20, 21) à la surface. Ledit générateur d'impulsions de pression comprend: un boîtier extérieur (30) pouvant être monté dans un élément de train de forage, et contenant les composants d'exploitation du générateur d'impulsions; une vanne principale (256, 257) comprenant une chambre de commande de vanne, qui, lorsque la vanne est ouverte, permet le passage du fluide de forage depuis l'intérieur du train de forage vers l'extérieur, générant ainsi un signal d'impulsion de pression qui se dirigera jusqu'à la surface; un premier clapet pilote (116, 120) normalement ouvert, de manière à permettre l'entrée du fluide dans la chambre de commande de la vanne principale afin de communiquer avec le fluide de forage dans l'annulaire; et, un second clapet pilote (88, 89, 90) normalement fermé, de manière à réguler l'écoulement du fluide de forage entre l'intérieur du train de forage et la chambre de commande de la vanne principale.

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