| 摘要 |
Method and apparatus for controlled fracturing of a portion of the earth's formations intermediate predetermined depths characterized by positioning adjacent the portion to be fractured explosive charges having exteriorly disposed grooves deep enough to effect a concentration of explosive forces along a predetermined fracture plane, the plane extending radially outwardly from the central longitudinal axis of the groove; and detonating the explosive charge to achieve the desired fracture. Preferred embodiments employ both horizontally-fracturing explosive charges containing peripherally disposed grooves having their central longitudinal axis in a plane perpendicular to the central longitudinal axis of the explosive charge and vertically-fracturing charges having longitudinally extending grooves so as to fracture outwardly in planes that are substantially vertically oriented and passed through the center line of the charge. Also disclosed are additional shapes of charges for effecting specific results, as well as the other elements and apparatus necessary for effecting detonation of the charges.
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