E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
166/23
E21B 43/26 (2006.01) E21B 43/263 (2006.01) E21B 47/02 (2006.01)
Patent
CA 1122114
ABSTRACT A fracture that conducts fluid within confines of an underground rock formation without the need for part1- culate proppant materials to hold opposing fracture faces apart is created by a method in a long portion of a hole drilled into the formation has its axis slanted with re- spect to the directions of the principal stresses, and is pressurized rapidly over its entire length with fluid, pre- ferably by detonating an explosive therein. A hypothetical fracture plane is defined as that plane containing the axis of the hole which is under the least compressive normal stress. When the orientation of the hole axis is such that there is a substantial shear stress on the hypothetical fracture plane, but the normal stress thereon does not greatly exceed the minimum principal stress, the fracture created lies close to the hypothetical fracture plane, and is conductive to fluids. The fracture is conductive be- cause it is held open by the misfit between the opposing faces which arises from the shear displacement of the faces that occurs when the existing shear stress is release by the forma- tion of the fracture.
338228
Coursen David L.
Cowan George R.
Eti Canada Inc.
Eti Explosives Technologies International Ltd.
Mccallum Brooks & Co.
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