Well Productivity Enhancement by Drilling Multi-Legged Wells - A Quantitative Assessment

Basic Information
Author: Sanyal, S.K., Morrow, J.W., Henneberger, R.C., and Granados, E.E.
Description:This paper presents an analysis of the well productivity enhancement possible by drilling multi-legged (or forked or multilateral) wells in geothermal fields at temperatures in the 100 to 250C range. A parameter, Productivity Enhancement Factor (PEF), is introduced to quantify productivity enhancement; it is defined as the ratio of the downhole productivity index of the multi-legged well to that of the original hole before the forked leg was added. Assuming the original hole to be vertical, it is shown that PEF rises sharply with deviation angle of the forked leg up to about 5 degrees; beyond this, PEF continues to increase with deviation angle albeit at a slower rate.
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Organization Name: Arizona Geological Survey
Street: 416 W. Congress St., Suite 100
City: Tucson
State: AZ
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