Method and system for pre-drill pore pressure prediction

Details Method and system for pre-drill pore pressure prediction Method and system for pre-drill pore pressure prediction

G - Physics

01

V

G01V 1/30 (2006.01) G01V 1/28 (2006.01)

Patent

CA 2618555

A method for pore pressure prediction. The method includes obtaining a stress sensitivity coefficient, obtaining a compressional wave (P-wave) velocity and a shear wave (S-wave) velocity for a pre-drill location and obtaining a first predicted pore pressure. Further, the method includes iteratively performing calculating a total stress value associated with the pre- drill location using the first predicted pore pressure associated with the pre- drill location, and calculating a second predicted pore pressure associated with the pre-drill location using a stress-pressure relationship equation, a stress-velocity relationship equation, the stress sensitivity coefficient, a reference location, and at least one selected from a group consisting of the P- wave velocity and the S-wave velocity for the pre-drill location, and adjusting a drilling operation associated with the pre-drill location, based on the second predicted pore pressure.

La présente invention concerne un procédé de prévision de pression interstitielle. Le procédé consiste à obtenir un coefficient de sensibilité de contrainte, à obtenir une vélocité de l'onde de compression (onde P) et une vélocité de l'onde de cisaillement (onde S) pour un emplacement avant forage et à obtenir une première prévision de pression interstitielle. Le procédé consiste ensuite à effectuer de manière itérative le calcul d'une valeur de contrainte totale associée à l'emplacement avant forage à l'aide de la première prévision de pression interstitielle associée à l'emplacement avant forage, puis le calcul d'une deuxième prévision de pression interstitielle associée à l'emplacement avant forage à l'aide d'une équation de la relation contrainte-pression, d'une équation de la relation contrainte-vélocité, du coefficient de sensibilité de contrainte, d'un emplacement de référence et de la vélocité d'onde P et/ou de la vélocité d'onde S pour l'emplacement avant forage, puis à ajuster une opération de forage associée à l'emplacement avant forage sur la base de la deuxième prévision de pression interstitielle.

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