ABSTRACT
The Jamin effect is defined as that resistance to liquid flow through capillaries which is due to the presence of bubbles. The actuality of this effect in the case of water is shown. It is concluded that the Jamin effect probably does not arise in the case of petroleum moving toward a producing well. That this effect retards underground water movement to any great extent appears doubtful.
One asphalt-base and one paraffine-base oil each exhibited greater adhesion for sand grains than did water under the laboratory conditions used. Hydraulic pressure produced more oil than did air pressure from similar artificial formations.
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