Logging while drilling apparatus with multiple depth of...

E - Fixed Constructions – 21 – B

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E21B 49/00 (2006.01) G01V 3/28 (2006.01)

Patent

CA 2081196

In an MWD system, a mandrel for connection to the drill bit is set forth which supports shallow, intermediate and deep measuring resistivity systems. By transmitting upwardly and downwardly in alternate fashion, and receiving the transmitted signal at pairs of receiver coils, transmitted signal phase shift and attenuation are measured. A method of measuring is set forth which includes making resistivity measurements close to the drill bit at increasing ranges from the borehole so that formation resistivity prior to fluid invasion is obtained. Measurements are thus provided of formation resistivity before, during and after fluid invasion. The method also accommodates formations which have a relative dip angle with respect to the well borehole.

Utilisé dans un système de mesures en cours de forage, un mandrin destiné à être raccordé à l'outil de forage porte des systèmes de mesure de la résistivité à des profondeurs variées : faibles, intermédiaires ou grandes. En émettant vers le haut ou vers le bas, en alternance, et en captant le signal émis, au moyen de deux bobines réceptrices, le déphasage et l'atténuation du signal émis sont mesurés. La méthode de mesure décrite inclut des mesures de résistivité près de l'outil de forage à des distances croissantes du trou de forage, de manière à obtenir la résistivité de la formation avant l'arrivée du fluide. Des mesures sont donc fournies au sujet de la résistivité de la formation avant, pendant et après l'arrivée du fluide. La méthode convient aussi aux formations qui ont un angle de pendage relatif par rapport au trou de forage.

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