Comparative Analysis of Analytical Models for Horizontal Well Productivity in a Homogenous Reservoir

S.O. Onche¹ , B.B. Kinate²

Section:Research Paper, Product Type: Journal-Paper
Vol.6 , Issue.10 , pp.19-23, Oct-2020

Online published on Oct 31, 2020

Copyright © S.O. Onche, B.B. Kinate . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
Horizontal wells are drilled essentially with the aim of recovering more oil or gas than a vertical well. The ratio of horizontal and vertical well productivity is one of the basic considerations in the decision to drill either a horizontal or vertical well. Attempts have been made to describe and estimate horizontal well productivity and injectivity indices, sweep efficiency, and several models have been proposed for this purpose. In this work, Matrix Laboratory (MATLAB) was used to model horizontal well indices with three analytical methods. Model results were compared with each other and with results from simulation using PETEX PROSPER single well modeling tool. Result obtained shows that increase in well length, pay thickness and anisotropy increases the productivity for all the models. Borisov’s model has the highest productivity index at different well depth and pay thickness. Joshi’s model result for the productivity index was the closest to the PETEX PROSPER result with a percentage error of approximately 3%, followed by Elgagah et al, and Borisov respectively. Discrepancies in model results are due to the varying assumptions inherent in the development of these models. Also, the effects of various well and reservoir properties such as well length, well thickness, permeability ratio and drainage area on horizontal well productivity was analyzed. The optimal well productivity for horizontal well will be realized from a thin reservoir with high vertical permeability and sufficient well length without compromising the ability for efficient drilling, completion and perforation, and a compact well spacing design.

Key-Words / Index Term :
Productivity index, Drainage Area, Pay Thickness, Horizontal well, Well Length

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