BORE-HOLE INVESTIGATIONS 1113 



of their connate water and the water of crystallization in the minerals out of which 

 they are made, contain more hydrogen than saturated, porous limes or sands. As a 

 result they usually are recorded as minimum values. Porous limestones and sands 

 containing fluid are usually recorded as proportionally intermediate values somewhere 

 between the value for shale and that for a dense formation. 



Figure 697 shows a log run in a well in Kansas to locate the porous zones in the 

 Mississippi limestone. The gamma-ray curve clearly outlines the limits of the limestone 

 body with a shale both above and below it. The minimum values of the neutron curve 

 indicate five porous zones within the otherwise dense limestone. These checked very 

 closely with other available information on this particular well. 



Figure 698 represents a well in the Salt Flat Field of Caldwell County, Texas. 

 The well was almost at the depletion stage in the Edwards lime. The log was run in 

 an attempt to locate a porous streak in the Austin Chalk. Although indications of 

 porosity are shown on the neutron curve throughout the Austin, the only really signifi- 

 cant zone is the one between 2320 and 2390 feet. This zone was perforated and acidized, 

 and it became a producer. 



DRILL-HOLE INVESTIGATIONS 

 UNITED STATES PATENTS 



73,513 Issued Jan. 21, 1868. John D. Dale. "Improvement in Apparatus for Dis- 

 covering the Fissures in the Sides of Wells." 



270,597 Issued Jan. 16, 1883. E. F. MacGeorge. "Method of and Apparatus for 

 Determining the Inclination of Borings." 



281,772 Issued July 24, 1883. E. F. MacGeorge. "Clinometer-Compass and Ap- 

 paratus for Reading its Indications." 



649,636 Issued May 15, 1900. Hermann Gothan. "Apparatus for Determining 

 Direction of Gradients of Stratified Masses." 



802,071 Issued Oct. 17, 1905. William R. Bawden. "Clinometer." 



821,048 Issued May 22, 1906. Hugh F. Marriott. "Means for Surveying Bore 

 Holes." 



830,730 Issued Sept. 11, 1906. Hugh F. Marriott. "Means for Surveying Bore 

 Holes." 



845,875 Issued Mar. 5, 1907. Percy Edward Lewis. "Instrument for Surveying Bore 

 Holes." 



856,990 Issued June 11, 1907. K. W. O. Schweder. "Instrument for Surveying Bore 

 Holes." 



963,242 Issued July 5, 1910. Robert Osterberg. "Measuring Instrument." 



965,808 Issued July 26, 1910. Matthias Garvey. "Apparatus for Testing Drill 

 Holes." 



1,003,624 Issued Sept. 19, 1911. George J. Maas. "Instrument for Surveying Bore 

 Holes." 



1.090.673 Issued Mar. 17, 1914. Titus A. Beecher. "Method for Locating the Place 

 and Character of a Liquid Coming from Strata in a Well." 



1.090.674 Issued Mar. 17, 1914. Titus A. Beecher. "Method for Locating the Place of 

 a Liquid Stratum in a Well." 



1,133,218 Issued Mar. 23, 1915. Titus A. Beecher. "Method for Locating Liquid 

 Strata in a Well." 



1,152,701 Issued Sept. 7, 1915. Helge A. Borresen. "Device for Ascertaining the 

 Vertical Angle and Direction of Diamond Drill Holes." 



1,209,102 Issued Dec. 19, 1916. Hermann Anschiitz-Kaempfe. "Apparatus for Deter- 

 mining Deviation of Bore Holes from the Vertical." 



1,440,778 Issued Jan. 2, 1923. Walter L. Foster. "Water Indicator for Oil Wells." 



1,536,007 Issued April 28, 1925. Frederick W. Huber. "Method for Locating Water- 

 Bearing Strata in Bore Holes." 



1,537,919 Issued May 12, 1925. Raymond D. Elliott. "Method of Locating the Level 

 at which Water Enters a Well." 



1,555,800 Issued Sept 29, 1925. Frederick W. Huber. "Method of Locating Water- 

 Bearing Strata in Bore Holes." 



