E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/63
E21B 33/138 (2006.01) E21B 33/134 (2006.01)
Patent
CA 1271414
ABSTRACT OF THE DISCLOSURE Shallow boreholes, e.g. seismic shot holes are usually sealed with cement, gravel or more recently by pouring a water swellable material such as bentonite into the hole. A more effective method of sealing involves the insertion of an impermeable bottom plug into the hole, followed by a thick layer of a particulate material such as sodium bentonite which expands when in contact with water to seal the hole. A top plug and also be used with or without a cover of cuttings to promote lateral expansion of the sealant in the hole.
512060
Arnall F. James
Graul Robert W.
Spence Robert K.
American Colloid Company
Arnall F. James
Dunsmuir George H.
E. S. P. Environmental Surface Plugs Ltd.
Graul Robert W.
LandOfFree
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