METHOD OF PERFORMING GEOPHYSICAL WORKS THROUGH DRILLING STRING Russian patent published in 2010 - IPC E21B47/00 E21B23/00 

FIELD: oil-and-gas production.

SUBSTANCE: hole instrument is furnished with chaser plug and lowered to preset depth, along with pumping flush fluid into well, using log winch with geophysical cable (GC) furnished with cable tip (CT) and passed through sealing device inside the string so that its lower end enters the instrument exposed barrel under action of fluid pressure. Then horizontal parametres are registered in analysed range on lifting the instrument on the surface. Prior to lowering the instrument into the well, GC is introduced into swivel flush channel via neck to allow CT to extend from lead pipe exposed end. Sealing device is fitted in aforesaid neck, instrument is connected to CT and swivel is lifted to the height that allows unobstructed access to GC section in substantiated range with smaller rod lengths and distance between height level and lead pipe counter face that allows entering said pipe hole and clamping rid top ends therein in mounting/dismantling jobs. Note here that said instrument is lowered into the string so that CT extends from its face to the height required for aforesaid jobs. Two identical rods are first made with lateral cutouts made along their length with clamping assemblies for GC to be reliably laid and clamped therein. Rigid segmented pusher is produced and instrument is lowered into the string on GC.

EFFECT: higher efficiency in complicated wellbores.

5 cl, 8 dwg