Method for controlling direction of horizontal borehole

• Main Authors: JONES, EMRYS H JR, MILLER, THOMAS R
• Format: Patent
• Language: English
• Published: 22.01.1980
• Subjects: EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS

A heavy cylinder having an axial flow passage is pumped down a rotary drill string to a position adjacent a drill bit to cause an in-seam horizontal drill to be guided in a downward direction. The cylinder can be removed with a latchable retrieval tool after the path of the borehole is sufficiently...