. Bulletin. IMPROVISED ROTARY CORE BARREL.(Courtesy of W. W. Scott.). B. CLOSE UP VIEW OF IMPROVISED ROTARY COREBARREL. SAMPLES OF FORMATIONS OF WATER AND OF OIL. 23 KOTARY CORE BARREL. The use of a core barrel or drag shoe in sampling formations ina rotar}^ well gives much more satisfactory results. Core samplesare obtained at a sacrifice of speed in making hole, but in wildcatterritory the loss of time is thoroughly justified, becuse such samplessupply accurate data, which is essential for determining the localposition of the oil horizons and for differentiating between forma-tions which aid
. Bulletin. IMPROVISED ROTARY CORE BARREL.(Courtesy of W. W. Scott.). B. CLOSE UP VIEW OF IMPROVISED ROTARY COREBARREL. SAMPLES OF FORMATIONS OF WATER AND OF OIL. 23 KOTARY CORE BARREL. The use of a core barrel or drag shoe in sampling formations ina rotar}^ well gives much more satisfactory results. Core samplesare obtained at a sacrifice of speed in making hole, but in wildcatterritory the loss of time is thoroughly justified, becuse such samplessupply accurate data, which is essential for determining the localposition of the oil horizons and for differentiating between forma-tions which aid in drilling and future correlation. Very satisfactory work can be done with a rotary when takingcores, and there is no reason for not obtaining good samples asoften as may be necessary to determine completely all of the geo-logic formations. An experience of H. L, Hamilton, consulting]>etroleum engineer. Houston, Tex,, is cited as an example. Hedirected the drilling of two rotary wildcat wells in northern Louisi-ana. In the first well no core barrel was used an
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
