FIELD: testing the nature of borehole walls and formation testing particularly for obtaining fluid samples or testing fluids, in boreholes or wells.
SUBSTANCE: device comprises tubular body to be secured inside drilling string arranged in well bore. The tubular body is provided with one or several extensions created along body axis and forming expanded axial part. Probe is arranged in expanded axial body part zone having minimal cross-section. The probe may be moved between extended and retracted positions. In extended position probe may touch well wall to gather information from formation. To protect probe during drilling operation probe in brought into retracted position. Drive adapted to move the probe between extended and retracted positions is installed on the body.
EFFECT: increased accuracy of well and formation testing.
38 cl, 29 dwg
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