Bulletin . Figure 8.—Formationsampler used by ih;Rio Bravo Oil Co. SAMPLING AND IDENTIFYING CUTTINGS. 117 taken. On the top of the core barrel an ordinary back-pressure valveis fitted which allows the mud and water contained in the barrel to beforced out as the core moves up the barrel and prevents the drill mudfrom entering the top of the core barrel. When the core is removed from the hole, some difficulty willalways be found in getting it out of the core barrel. When 1-footlengths of flush-joint pipe are used they can be unscrewed and thecore pushed out. In Figure 8 is shown a coring device
Bulletin . Figure 8.—Formationsampler used by ih;Rio Bravo Oil Co. SAMPLING AND IDENTIFYING CUTTINGS. 117 taken. On the top of the core barrel an ordinary back-pressure valveis fitted which allows the mud and water contained in the barrel to beforced out as the core moves up the barrel and prevents the drill mudfrom entering the top of the core barrel. When the core is removed from the hole, some difficulty willalways be found in getting it out of the core barrel. When 1-footlengths of flush-joint pipe are used they can be unscrewed and thecore pushed out. In Figure 8 is shown a coring device used by the Rio Bravo OilCo., of Texas, for coring in soft formations. This device has workedsatisfactorily, but only 4 or 5 feet of core can be made at one timeand all hole made has to be reamed to size afterwards. Such re-duction of hole is sometimes desirable in looking for a suitable cas-ing seat or in feeling ahead for an oil sand above which a stringof casing is to be set. Suman states that A. R. Ga
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
