Well perforating methods
AssigneeHalliburton Company
InventorLowell W. Revett
Life of this patent
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Abstract
A well completion method comprising suspending NaCl crystals in the interval of the well bore to be perforated where the NaCl crystals are sized to bridge the perforations when the hydraulic pressure in the well bore exceeds the hydraulic pressure in the earth formation. The perforator is arranged to produce penetrations in the well bore in a radial pattern about the circumference of the well bore so as to effectively penetrate the entire circumference over a short interval. This enhances the perforation of vertical fractures in the earth formations.
Claims7
A method for increasing the probability of perforating existing vertical fractures outside well casing in a cased well borehole in earth formations traversed by a well bore comprising:
- disposing a suspension of NaCl crystals in a fluid over an interval of a well bore where it is desired to perforate the surrounding earth formations, said crystals being sized to bridge over a perforation;
- disposing perforating means in said interval where said perforating means are arranged, upon activation, to produce penetrations in the circumference of a cased well bore along a vertical section of the cased well, said perforating means being spaced longitudinally with respect to one another with respect to said vertical axis and being azimuthally oriented with respect to one another to provide penetrations at angles of approximately 15.degree. with respect to said vertical axis;
- and
- maintaining the hydraulic pressure of said fluid in said interval greater than the expected pressure of the earth formations to be perforated.
Dependencies are inferred from the claim text.