An innovative patent for “making holes in hard rock.”
An “Improvement in Rock Drills” patent issued after the Civil War included the basic elements of the modern petroleum industry’s rotary rig. On January 2, 1866, Peter Sweeney of New York City was granted U.S. patent No. 51,902 for a drilling system with many innovative technologies.
Sweeny’s 1866 rotary rig design, which improved upon an 1844 British patent by Robert Beart, applied rotary drilling’s “peculiar construction particularly adapted for boring deep wells.” More efficient than cable-tool percussion bits, the patent provided for a roller bit with replaceable cutting wheels such “that by giving the head a rapid rotary motion the wheels cut into the ground or rock and a clean hole is produced.”
Sweeney’s design utilized a roller bit with replaceable cutting wheels such “that by giving the head a rapid rotary motion the wheels cut into the ground or rock and a clean hole is produced.” In another innovation, the “drill-rod” was hollow and connected with a hose through which “a current of steam or water can be introduced in such a manner that the discharge of the dirt and dust from the bottom of the hole is facilitated.”
Better than commonly used steam-powered cable-tools, which used heavy rope to lift and drop iron chisel-like bits, Sweeney claimed his drilling apparatus could be used with great advantage for “making holes in hard rock in a horizontal, oblique, or vertical direction.”
Drilling operations could be continued without interruption, Sweeny explained in his patent application, “with the exception of the time required for adding new sections to the drill rod as the depth of the hole increases. The dirt is discharged during the operation of boring and a clean hole is obtained into which the tubing can be introduced without difficulty.”
Foreseeing the offshore exploration industry, Sweeney’s patent concluded with a note that “the apparatus can also be used with advantage for submarine operations.”
With the American oil industry booming, drilling contractors improved upon Sweeney’s idea. A new device was fitted to the rotary table that clamped around the drill pipe and turned. As this “kelly bushing” rotated, the pipe rotated – and with it the bit down hole. The torque of the rotary table was transmitted to the drill stem.
Thirty-five years after Sweeney’s patent, rotary drilling revolutionized the petroleum industry after a 1901 oil discovery by Capt. Anthony Lucas launched a drilling boom at Spindletop Hill near Beaumont, Texas. Learn more at Making Hole – Drilling Technology.
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Citation Information – Article Title: “Sweeny’s 1866 Rotary Rig.” Authors: B.A. Wells and K.L. Wells. Website Name: American Oil & Gas Historical Society. URL: https://aoghs.org/technology/1866-patent-rotary-rig. Last Updated: December 18, 2020. Original Published Date: January 2, 2013.