Wells – Means for forming filter beds
Patent
1983-11-07
1989-05-02
Dang, Hoang C.
Wells
Means for forming filter beds
166158, E21B 4304, E21B 4310
Patent
active
048259446
ABSTRACT:
A method and apparatus for completing an in situ leach well to prevent production of sand and to insure minimum permeability damage to the ore bearing zone during casing and cementing operations. A hole for the casing is drilled to and terminated at a point (e.g. onefoot) just above the ore zone. If a pilot hole has been drilled to locate the ore zone, it is reamed to provide the hole for the casing with the cuttings from the reaming operations dropping into lower portion of the pilot hole which extends through the ore zone, thereby protecting the ore zone from permeability damage normally cause by contact with cement. The hole is then cased and cemented. Next, a hole is drilled from the lower end of the casing into the ore zone and an interval thereof is underreamed. A perforated liner is lowered on a drill stem which has a stinger pipe thereon which extends through the lower end of the liner. Gravel is then pumped down the drill stem and out the stinger pipe to fill the underreamed interval around the liner. The drill stem is then raised to position the stinger pipe within the liner and water is circulated to wash the liner. The drill stem and stinger pipe is then removed.
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Dang Hoang C.
Everest Minerals Corp.
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