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Mining Publication: Methane Drainage: Experience With Hydraulic Stimulation Through Slotted Casing

Original creation date: January 1978

Image of publication Methane Drainage: Experience With Hydraulic Stimulation Through Slotted Casing

The Bureau of Mines examined the wellbore of a vertical gas drainage well in the Mary Lee coalbed to determine the results of specific completion procedures in coal. A jet-slotting tool was used to cut four vertical slots through the casing about 1 ft below the coalbed. Even though stimulation treatment pressure was excessive, hydraulically induced channels were contained entirely within the target coal zone. Sand-filled, induced channels were horizontal, inclined, and vertical, and were propagated in directions similar to bedding planes, rock joint, and coal cleat directions measured in the mine. Variable gas flow rates, recorded during the productive life of the well, were attributed to chronic downhole pump malfunction and the slotted casing below the production zone.

Authors: SW Lambert, MA Trevits

Report of Investigations - January 1978

  • 0.84 MB

NIOSHTIC2 Number: 10000676

Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, RI 8295, 1978 Jan; :1-16


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