Research Papers: Petroleum Wells-Drilling/Production/Construction

Modeling Productivity Index for Long Horizontal Well

[+] Author and Article Information
Fadairo A. S. Adesina, Ako Churchill, Falode Olugbenga

Energy and Environmental Research Group, Department of Petroleum Engineering,  Covenant University Ota, Nigeria

J. Energy Resour. Technol 133(3), 033101 (Oct 03, 2011) (8 pages) doi:10.1115/1.4004887 History: Received June 15, 2007; Revised July 27, 2011; Published October 03, 2011

Horizontal wells have become a popular alternative for the development of hydrocarbon fields around the world because of their high flow efficiency caused by a larger contact area made with the reservoir. Most of the analytical work done in the past on horizontal productivity either assumed that the well is infinitely conductive or the flow is uniform along the entire well length. The infinite conductive assumption is good only when the pressure drop in the wellbore is very small compared to the drawdown in the reservoir otherwise the pressure drop in the wellbore should be taken into account. In this paper, an improved predictive model that takes into account the effect of all possible wellbore pressure losses on productivity index of long horizontal well was developed. Results show that the discrepancies in the predictions of the previous models and experimental results were not only due to effect of friction pressure losses as opined by Cho and Shah but may also be due to all prominent pressure losses such as kinetic change and fluid accumulation experienced by the flowing fluid in a conduit. The effect is most pronounced at the early production time where initial transience at the onset of flow is experienced.

Copyright © 2011 by American Society of Mechanical Engineers
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Figure 1

Productivity index versus time

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Figure 2

Productivity index versus horizontal well length at diameter = 0.25 ft

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Figure 3

Productivity index versus horizontal well length at diameter = 0.50 ft

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Figure 4

Productivity index versus horizontal well length at diameter = 1.0 ft

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Figure 5

Productivity index versus Horizontal Well Length at diameter = 1.35 ft

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Figure 6

Optimum diameter corresponding to horizontal well length



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