Method for mechanical and capillary seal analysis of a...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01)

Patent

CA 2627310

Method for making a probabilistic determination of total seal capacity for a hydrocarbon trap, simultaneously considering both capillary entry pressure and mechanical seal capacity, and where capillary entry pressure is estimated by relating it directly to the buoyancy pressure applied by the hydrocarbon column to the top seal. The method thus considers the substantial uncertainty associated with input parameters, which uncertainty limits the utility of such analyses for robust hydrocarbon column height and fluid contact predictions. The method disclosed for estimating seal capillary entry pressure, the requisite input parameter for capillary seal capacity analysis, by inverting trap parameters avoids the need for direct measurement by mercury injection capillary capacity tests on small pieces of rock, which test results often are not available for all desired locations nor are they necessarily representative of adjacent rocks in the seal.

Procédé de détermination de probabilité de la capacité totale d'étanchéité d'un piège à hydrocarbure, en considérant simultanément la pression d'entrée capillaire et la capacité d'étanchéité mécanique, et où l'on estime la pression d'entrée capillaire en la liant directement à la pression de flottaison appliquée par la colonne d'hydrocarbure au joint supérieur. Le procédé considère ainsi l'incertitude substantielle associée aux paramètres d'entrée, laquelle incertitude limite l'utilité de telles analyses pour bien prédire la hauteur de colonne d'hydrocarbure et le contact du fluide. Le procédé divulgué permettant d'estimer la pression d'entrée capillaire du joint, le paramètre d'entrée requis pour une analyse de capacité d'étanchéité capillaire, en inversant les paramètres de piégeage supprime la nécessité d'une mesure directe reposant sur des essais de capacité capillaire par injection de mercure sur des petits morceaux de roche, les résultats desdits essais étant souvent indisponibles pour tous les emplacements désirés et n'étant pas forcément significatifs des roches adjacentes dans le joint.

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