Within the last 10 years the world has come to a point where the easily explorable oil deposits have now been found, and it is anticipated that such deposits will be depleted by the beginning of the Twenty-first Century. However, the increasing demand of man kind for energy has caused technologists to look into ways of find ing new sources or to reevaluat:e unconventional sources which, in the past, have not been economical. In this respect, heavy crude and tar sand oils are becoming important in fulfilling the world's energy requirements. What are heavy crude and tar sand oils? There is still some confusion as to their definitions, inasmuch as they vary among organizations and countries. In an effort to set agreed meanings, UNITAR, in a meeting in February 1982 in Venezuela, proposed the following definitions (see also Table 1): 1. Heavy crude oil and tar sand oil are petroleum or petroleum like liquids or semi-solids naturally occurring in porous media. The porous media are sands, sandstone, and carbonate rocks. 2. These oils will be characterized by viscosity and density. Viscosity will be used to define heavy crude oil and tar sand oil, and density (oAPI) will be used when viscosity measurements are not available. 3. Heavy crude oil has a gas-free viscosity of 100-10000 mPa.s (cp) 3 o at reservoir temperatures, or a density of 943 kg/m (20 API) 3 o o to 1000 kg/m (10 API) at 15.6 C and at atmospheric oressure.

Inhalt
Phase Behavior of Heavy Oils with Application to Reservoir Recovery Processes.- Steam InjectionTheory and Practice.- A Review of Use of FoamGenerating Surfactants to Improve Injection Profiles and Decrease Gravity Override in Steam Injection.- FireWater Flooding from Principles to Field Applications.- Carbon Dioxide FloodingFundamentals.- CO2 Injection to Enhance Heavy Oil Recovery.- CO2 Heavy Oil Flooding Economic Design.- Micellar Flooding at Penn State.- Alkaline Flooding.- Fundamentals of Polymer Flooding.- Principles of Numerical Simulation of Oil ReservoirsAn Overview.- Mathematical Simulation of Thermal Recovery Processes.