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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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In the paper "Estimating Drilling Direction for Optimum Production in a Fractured Reservoir" by Richard C. Nolen-Hoeksema and J. H. Howard (AAPG Bulletin, v. 71, no. 8, August 1987, p. 958-966), the following corrections should be made to the text in the left-hand column on page 960.
The sentence that immediately follows equation 3 should read: "The function P (equation 2) is either a minimum or a maximum when ^dgrv^Rgr/^dgrv^kgr equals zero."
The first complete sentence that follows equation 4 should read: "Thus, ^dgrv^Rgr/^dgrv^kgr equals zero corresponds with a maximum value for P (equation 2) when ^Thgr equals ^kgr, the second 
derivative
of ^Rgr being negative."
In final form, the expression "^dgrv^Rgr/^dgrv^kgr" inadvertently was typeset incorrectly to read "=^Rgr/ =^kgr" in both cases.
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