. Bulletin. not all of these areoil producing:, and where one sand is logged 50 to 75 feet thick onlya part of this may be productive. If this is true, the same sand maycontain more than one grade of oil, and with several producing sandseach sanil may contain a slightly different grade of oil. This is dis-cussed later. The lithology of the sand should be studied in con-junction with its i)roductivity. Perhaps this study will point outwhicii parts of the sand need to l)e shot, if shooting is FiGUUE 35.—Sketch showing presence of edge water due to a natural condition. Manyoil sands w
. Bulletin. not all of these areoil producing:, and where one sand is logged 50 to 75 feet thick onlya part of this may be productive. If this is true, the same sand maycontain more than one grade of oil, and with several producing sandseach sanil may contain a slightly different grade of oil. This is dis-cussed later. The lithology of the sand should be studied in con-junction with its i)roductivity. Perhaps this study will point outwhicii parts of the sand need to l)e shot, if shooting is FiGUUE 35.—Sketch showing presence of edge water due to a natural condition. Manyoil sands when followed far enough down the dip are found to contain only oil is removed from above, water follows it up along the stratum. After Bull. 82,California State Mining Bureau, p. 16. DISCOVERY OF NEW OIL ZONE, In drilling a well the likelihood of discovering a new productiveoil sand overlooked in other wells should l^e considered. Such a thingis quite possible where the wells have been drilled with the hole fullof water and mud, as this may preclude any showing on the a new field the operators are usually looking for the big producingsand. Oil may show in the ditch or on the fluid from the bailer afterit has been run to bottom, but if the well does not flow the sand maybe passed by without testing. The proper test is to bail the well down and liring the oil into thehole. Swabbing and shooting may accomplish the same result. Thedriller will readily understand whj the oil does
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
