Use of cutting velocities for real time pore pressure and...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01) E21B 47/06 (2006.01) G01V 1/50 (2006.01)

Patent

CA 2462973

Disclosed is a new method for providing accurate real time predictions of pore pressure and fracture gradient, at the rig site by determining the wave velocity from drill cuttings by means of a portable continuous wave technology (CWT) tool that measures drill cuttings at high resonant frequency and then using the velocity obtained in combination with the novel method of the present invention to arrive at accurate predictions for pore pressure and fracture gradient. The new technique offers real time pore pressure prediction at the rig site with small error margin that is not otherwise available using seismic, VSP, or check shot velocities in exploration.

L'invention concerne un nouveau procédé permettant d'effectuer des prédictions précises en temps réel de gradient de pression et de rupture de pores, au site de forage, par détermination de la vitesse de propagation des ondes provenant des sciures de forage, à l'aide d'un outil portatif de technologie d'ondes continue, qui mesure les sciures de forage à haute fréquence de résonance et utilise ensuite la vitesse obtenue en combinaison avec le nouveau procédé de l'invention, afin de parvenir à des prédictions précises de gradient de pression et de rupture de pores. Cette nouvelle technique permet d'effectuer des prédictions en temps réel de la pression de pores, au site de forage, avec une faible marge d'erreurs, ce qui n'est pas possible en utilisant des vitesses sismiques, le profilage sismique vertical ou des vitesses de forage de carottes de contrôle en exploration.

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