METHOD OF GEOPHYSICAL STUDY OF HORIZONTAL BOREHOLES Russian patent published in 1994 - IPC

FIELD: geophysical method of investigation. SUBSTANCE: string of drill pipes is lowered to face of boreholes. Lower part of string equal in length to length of horizontal section of investigated borehole is formed from pipes of different types alternating in series to ensure registration of geophysical parameters with different physical methods. Registration of geophysical parameters is accomplished in turn by different physical methods by shortening string of pipes by distance equal to length of one of alternating pipes. In this case number of repeat registrations equals to n-1, where n is number of pipes. Continuous glass reinforced plastic pipes are used as alternating pipes to register geophysical parameters by contactless method. For registration of geophysical parameters by contact method glass reinforced plastic pipes are used also but with through holes made in their walls sealed with metal plugs. For radiometric method of investigation there are used duralumin pipes. EFFECT: expanded investigational capabilities. 4 cl, 2 dwg