Application of the Pulsed Neutron Gamma Ray Logging (PNGRL) Tool Modifications for Detection of Productive Intervals While Monitoring Romashkino Oil Field Development

Control of the current oil saturation and flooding of the productive terrigenous reservoirs in Romashkino oil<br>field is provided by PNGRL tool including single sonde spectral modification (CO-logging) and two/three<br>sonde integral modifications. The report covers the results of geophysical well logging conducted by integral<br>and spectral modifications of PNGRL to determine the nature of productive intervals saturation. The integral<br>and spectral modifications of PNGRL proved to be efficient for the development control of the field with the<br>flooded productive reservoirs by the water of various mineralization. It is given the physical and<br>methodological basis of pulsed oxygen neutron activation logging method, conducted by 36 mm three-sonde<br>PNGRL borehole tool modification, along with the examples of the string annulus crossflow determination<br>in injection and producing wells.