Smooth draw-down for formation pressure testing

Details Smooth draw-down for formation pressure testing Smooth draw-down for formation pressure testing

E - Fixed Constructions

21

B

E21B 49/08 (2006.01) E21B 49/10 (2006.01)

Patent

CA 2556427

A method and apparatus for of determining a formation parameter of interest. The method includes placing a tool into communication with the formation to test the formation and drawing down a test volume at an increasing draw rate during a first draw period and decreasing the draw rate during a second draw period to create a smooth draw down cycle. The draw down can be step-wise or continuous. The formation parameter is determined using formation rate analyis and characteristics determined during the draw down cycle.

La présente invention concerne un procédé et un appareil pour déterminer un paramètre de formation cible. Le procédé consiste à placer un outil en communication avec la formation afin de tester la formation, puis à soutirer un volume de test à une vitesse de soutirage croissante pendant une première période de soutirage et à réduire la vitesse de soutirage pendant une seconde période de soutirage afin de créer un cycle régulier de soutirage. Le soutirage peut être progressif ou continu. Le paramètre de formation est déterminé au moyen d'une analyse de vitesse de formation et de caractéristiques déterminées lors du cycle de soutirage.

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