RI 3481 Bureau Of Mines - A.P.I. Pressure Core Barrel (Progress Report On Its Design And Development) ? Introduction (89da8445-1c95-47a6-a11f-7c7795d0b151)

[Recovery of core specimens from subsurface formations and their subsequent analysis are important aids in efficient development and operation of oil and gas fields. Core specimens first were obtained mainly for the geologic information they revealed; now they are analyzed to determine many of the physical characteristics and conditions of tae subsurface formations as well. Cores recovered from the producing formations may be analyzed for porosity, permeability, oil content, "connate" water content, and other physical and chemical properties of the formation, all to the end of furnishing enough data for making reliable estimates of the quantity and availability of oil and gas within a reservoir and in devising, efficient means for their withdrawal.]