Patent ID: 6585045
Filing Date: 2003-07-01
Classification: E21B

Abstract:
An apparatus for determining a parameter of interest of a subterranean formation in-situ, comprising:(a) a work string for conveying a tool into a well borehole, the borehole and tool having an annular space extending between the tool and a wall of the borehole; (b) at least one selectively extendable member mounted on the tool, the at least one extendable member being capable of isolating a portion of the annular space; (c) at least two ports in the tool, the ports being exposable to a fluid containing formation fluid in the isolated annular space, the at least two ports being isolated from each other and wherein a predetermined distance between the at least two ports is proportional to the size of at least one of the at least two ports and is a range selected from a group consisting of (i) equal to or greater than 1Ã—RP; (ii) less than or equal to 12Ã—RP; and (iii) equal to or greater than 1Ã—RP and less than or equal to 12Ã—RP; and (d) a measuring device determining at least one characteristic of the fluid in the isolated section, the characteristic being indicative of the parameter of interest.