Electricity: measuring and testing – Of geophysical surface or subsurface in situ – Including borehole fluid investigation
Patent
1997-09-25
1999-12-14
Patidar, Jay
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
Including borehole fluid investigation
324355, 702 6, G01V 318, G01V 302
Patent
active
060022574
ABSTRACT:
A method and apparatus for navigating a tool string down a subsurface borehole to its intended location while simultaneously measuring or sensing the borehole environment, electrically, acoustically, mechanically, or by nuclear means, for a characteristic parameter. The hole-finder apparatus incorporating a locally flexible body adapted for attachment to the tool string. As the tool string is navigated through the borehole, the flexible body provides extreme local flexibility to lessen the likelihood of jamming the tool string while tripping down the borehole by providing a lateral force at the obstruction. The hole-finder apparatus further including a sensor or probe measuring means attached to or within the tip of the flexible body for measuring the characteristic parameter. With the sensor or measurement means disposed at the tip of the apparatus, the sense point is moved to the bottom of the tool string to provide borehole characteristic measurements having little effect on, or momentary influence from, the formation without impeding the apparatus' hole-finding capability. In addition, data representative of the borehole or formation characteristic parameter is communicated from the apparatus to a distant point by wiring.
REFERENCES:
patent: 4171031 (1979-10-01), Marquis
patent: 4901804 (1990-02-01), Thometz et al.
patent: 5210533 (1993-05-01), Summers et al.
patent: 5574371 (1996-11-01), Tabanou et al.
Hazen Gary A.
Thomas Stanley R.
Patidar Jay
Ryberg John J.
Schlumberger Technology Corporation
Segura Victor H.
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