Oil formation volume factor, B. measured in bbl/STB- Volume of an oil phase sample with its dissolved gas at reservoir conditions divided by the volume of oil phase of the same sample at stock tank conditions (i.e.after its dissolved gas has liberated) a. Draw a pictorial illustration of Bo b. c. What are the three factors that causes the volume of oil that enters the stock tank to be less than the volume of oil which flows into the wellbore. Compare their magnitudes. A typical graph of B, is given Fig. 1 based on this figure explain the following Explain the physical phenomena that causes B, to attain a negative slope above p Explain the physical phenomena that causes B. to change rapidly if p is less than p Why we cannot have a B. less than 1. 1.40 FORMATION VOLUME FACTOR, BBL/STB 1.30 1.20 1.10 1.00 1200 PSIA Bo 1.210 14.7 PSIA & 160F Bo 1.040 1 14.7 PSIA & 60F 8o 1.000 500 1000 2500 PSIA Bos 1.333 1500 2000 PRESSURE, PSIA BUBBLE POINT PRESSURE 2500 3500 PSIA Bol 1.310 INITIAL PRESSURE 3000 3500