This paper represents the results of calculations and considerations on pressure gradients of gas-saturated oil in the vicinity of an oil well: (1) Although a larger diameter of a well gives rise to a lower resitance to flow, this fact is not prominent in case of producinga well with a small pressure difference between an oil well and a reservoir. (2) Interference phenomenon between producing oil wells hardly occurs if a distance between the wells is not extremely small.
Because of the accuracy and rapidity for testing, a method by the use of the Dean and Stark apparatus and the Soxlet extractor is the most practicable for determining oil and water saturation in cores. A method which makes use of the critical solution temperature of alcohol is adaptable for small samples. The main objection to a retort method is the possibility of driving out water of crystallization.