Patent ID: 7600420

Claim:
A method for testing an underground formation penetrated by a well, the method comprising: providing a downhole tool, the downhole tool configured to be coupled to a work string and to convey a measuring device for testing the subterranean formation penetrated by the well; selecting a stabilizing sub from a plurality of stabilizing subs each configured to be coupled to the downhole tool, the stabilizing sub having an outer surface offset a first distance relative to an outer surface of said downhole tool, the first distance being different from other offset distances of other ones of the plurality of stabilizing subs; selecting a pad from a plurality of pads configured to be coupled to said downhole tool, wherein the pad is configured to protrude from the downhole tool outer surface by a second distance different from distances associated with others of the plurality of pads, and wherein the pad is selected based on the first distance associated with the stabilizing sub; coupling said selected stabilizer sub and said selected pad to the downhole tool; lowering the downhole tool in the underground formation; and testing the underground formation using the measurement device.