AN ACOUSTIC SYSTEM TO GUIDE A COAL SEAM AUGER

• Main Authors: COON, JULIAN B, PAYTON, CHARLES E, FOWLER, JAMES C, WATERS, KENNETH, H
• Format: Patent
• Language: English; French; German
• Published: 24.11.1982
• Edition: 3
• Subjects: ANALOGOUS ARRANGEMENTS USING OTHER WAVES; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; EARTH DRILLING; EARTH DRILLING, e.g. DEEP DRILLING; FIXED CONSTRUCTIONS; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES; MEASURING; MINING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS; PHYSICS; RADIO DIRECTION-FINDING; RADIO NAVIGATION; TESTING

Procede de forage d'un trou (20), de telle sorte que son axe soit sensiblement parallele a l'axe d'un trou deja fore (20) pour positionner un emetteur acoustique (28) et un recepteur (30) contre le trou en cours de forage de sorte que leur position sur la paroi soit sur un plan horizontal coupant l'axe de l'alesage du trou en cours de forage. Ensuite, un signal acoustique de frequence acoustique est transmis dans la paroi du trou. Le signal reflechi est recu de la paroi adjacente en meme temps que d'autres reflexions supplementaires indesirees. Le dephasage est alors determine entre le signal transmis et le signal recu et les changements de distance entre la paroi du trou de l'alesage sont ensuite determines. A method for boring a hole (20) so that its axis is substantially parallel to the axis of a previously bored hole (10) for positioning an acoustical transmitter (28) and receiver (30) against the hole of the hole being bored so that their position on the wall lies on a horizontal plane through the axis of the bore hole being bored. Then transmitting an acoustical frequency acoustical signal into the wall of the hole. The reflected signal is then received from the adjacent wall along with other unwanted additional reflections. The phase shift is then determined between the transmitted and received signal and the changes in the distance between the wall of the bore hole is then determined.