A Three-Detector Logging Method Using D-D Generator in Sidetracking well for Shale Oil & Gas Reservoir

With the escalating demand for oil and gas exploration, conducting horizontal drilling on existing wells has become indispensable for enhancing production. Regarding deepwater and deep-layer working conditions as well as in tight formations and shale oil and gas fields, porosity detection and fluid identification are of paramount significance during the horizontal drilling process. A novel three-detector pulsed neutron tool based on a d-d source is employed in complex tight formations. It can identify oil, gas and water through the combination of neutron information and gamma information from detectors with different source-detector distances. Additionally, it enhances the measurement accuracy of oil and gas saturation. This approach enables the convenient combination of gamma ray and thermal neutron detector devices to simultaneously determine porosity and assess fluid types.