Wellbore profiling system

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 47/022 (2012.01) E21B 47/06 (2012.01)

Patent

CA 2215888

A method is presented for accurately surveying and determining the profile of the path of a subterranean wellbore containing a constant density fluid extending contiguously throughout. A first pressure sensor, associated with a downhole tool, is traversed station-by-station along the wellbore for measuring the pressure of the fluid within the wellbore at each station. A second pressure sensor is located within the wellbore fluid at a known elevation. The elevation of the first pressure sensor, at a station, is determined by adding the calculated differential height to the known absolute elevation of the second sensor. As each elevation is referenced to the second sensor, no cumulative errors are incurred. If the density of the fluid is unknown, a third pressure sensor within the wellbore fluid can be provided at a known elevation different from that of the second sensor. The areal position of each station is determined by conventional means associated with the downhole tool. The elevation for each of a plurality of stations is combined with the areal position determined at each station to determine the path of the wellbore.

Cette invention concerne une méthode pour déterminer avec exactitude le profil d'un puits renfermant un fluide de densité constante. Un premier capteur de pression est descendu avec l'outil de fond pour mesurer la pression du fluide à chaque station. Un deuxième capteur de pression est placé dans le fluide à une élévation connue. L'élévation du premier capteur de pression est déterminée à chaque station en additionnant la différence d'élévation entre celui-ci et le deuxième capteur à la valeur absolue de l'élévation connue du deuxième capteur. On évite l'erreur cumulative en déterminant l'élévation de chacune des stations séparément par rapport à celle du deuxième capteur. Si la densité du fluide est inconnue, on peut placer un troisième capteur de pression dans le fluide, à une élévation connue différente de celle du deuxième capteur. La position de surface de chaque station est déterminée de la façon classique, au moyen d'un dispositif associé à l'outil de fond. L'élévation et la position de surface de chacune des stations permettent de déterminer le profil du puits.

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