Methods of detecting the locations of well treating fluids

摘要

Methods are provided for detecting the surface and/or subterranean locations of well treating fluids after the treating fluids have been introduced into wells and used for performing treatments therein. The methods of determining the subterranean locations of treating fluids basically comprise introducing a treating fluid into a well having a non-hazardous thermal neutron absorbing material combined therewith and performing a treatment in the well with the fluid. Fast neutrons from a source thereof are emitted in the well after the treatment whereby they interact with elements in the well and are thermalized. The thermal neutrons backscattered in the well are detected, and a count representing the detected thermal neutrons is generated. The subterranean locations of the treating fluid are determined by comparing the thermal neutron counts in the well before and after placement of the thermal neutron absorbing treating fluid therein.