Jack P. Myers, Lane Wells Co.
Along with the development of new tools there are continuous improvements of existing tools and techniques. It is the purpose of this paper to review some of the new radioactivity tools that have been developed and also review some of the existing tools that have undergone significant improvements. The following major subjects are discussed: The casing potential profile, the densilog, small diameter radioactivity instruments, radioactivity tracer injector, and the perforating-formation collar chart. The interpretation of radioactive tracer surveys and porosity determinations from the neuron curve will also be discussed. Because of the number of subjects covered, the explanations are brief and confined to the theory of operation, the significant improvements, results obtained and the advantages to be derived from their use.