Sensitivity analysis of horizontal well productivity under steady-state conditions

Shedid A. Shedid, Abdulrazag Y. Zekri

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

Many horizontal wells are being drilled all over the world to increase their productivity in comparison to that of vertical wells. Horizontal wells increase reservoir contact area and thus increase productivity. Therefore, it is essential to be able to predict the horizontal well productivity. The major objectives of this investigation are to: (1) develop a comprehensive evaluation of currently-used steady-state productivity equations of horizontal well, (2) investigate the effect of horizontal well length and pay zone thickness on the productivity ratio of horizontal well to vertical well, when both having the same drainage area and under identical flow conditions, and (3) study the influence of pressure drop on production rate of horizontal wells using different steady-state flow equations. In this study, six different steady-state equations of the open-hole horizontal wells under identical conditions of flow parameters and reservoir geometry are subjected to a wide ranges of horizontal well lengths (100 to 3,000 ft), pay zone thickness (50 ft to 500 ft), and pressure drop (10 psi to 200 psi). These horizontal wells were used to calculate the productivity and to study the influences of flow rate and pressure drop on the sensitivity of these equations. The obtained results showed that all steady-state equations provide similar horizontal well productivity for horizontal well length < 1000 ft, while a remarkable difference appears and increases when well length increases > 1,000 ft. In addition, the results using all steady-state equations confirmed the recommendation of the application of horizontal well for thin formations and do not recommend it in thick ones (h> 250 ft) for wells having identical rock and fluid properties. Comparing the performance of steady-state equations showed that all of these equations are sensitive to the increase of pressure drop, which yields an increase in flow rate of horizontal well. The results of this study have important implications in reservoir simulation studies, since it evaluates some important variables including pay zone thickness, well length, and pressure drop on the performance of each flow equation.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - SPE Asia Pacific Improved Oil Recovery Conference 2001, APIORC 2001
PublisherSociety of Petroleum Engineers
ISBN (Print)9781555639198
DOIs
Publication statusPublished - 2001
EventSPE Asia Pacific Improved Oil Recovery Conference 2001, APIORC 2001 - Kuala Lumpur, Malaysia
Duration: Oct 6 2001Oct 9 2001

Publication series

NameSociety of Petroleum Engineers - SPE Asia Pacific Improved Oil Recovery Conference 2001, APIORC 2001

Conference

ConferenceSPE Asia Pacific Improved Oil Recovery Conference 2001, APIORC 2001
Country/TerritoryMalaysia
CityKuala Lumpur
Period10/6/0110/9/01

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • General Chemical Engineering

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