Prediction of oil critical rate in vertical wells using Meyer-Gardner correlations

J Oloro

doi:10.4314/jasem.v22i4.26

Abstract

This paper investigates the prediction of oil critical rate in vertical wells using Meyer-Gardner correlations by developing a computer program to determine the oil critical rate for a vertical well in a reservoir system. The results obtained from manual computation and prediction using the program is the same. This shows that the program developed is reliable. The results also shown that perforated interval, pay-zone thickness and fluid properties affect critical oil rate.Keywords: Breakthrough, Time, Reservoir, Coning

Highlights

Coning is a mechanism that describes the movement of water from lower to higher and/or movement of gas from higher to lower into the perforations of a producing oil well which can affect the well productivity (Wheatley, 1985).In oil and gas production, adequate planning are put in place to prevent any production-problems, such as coning problem (Anietie et al, 2017).Coning can exhibit detrimental impacts on operations, recovery, and economics in oil production
Due to capillary pressure effect, a transition zone may occur at the interface boundary as sharp fluid interfaces is only an engineering idealization (Ike, 2011).It is usual thing in petroleum reservoir coning modeling to neglect capillary forces (Chaperon, 1986,Papatzacos,1991)
The time period between production commencements from original condition to when the unwanted fluid cones into the well is known as the breakthrough time (Ayeni, 2008).Coning is as a result of declined in pressure around the perforation zone and the presence of a strong water aquifer or gas cap (Kwame, 2014).Coning is a petroleum engineering problem since oil found below a gas zone, or above water zone (Ike, 2013).The aim and objectives of this paper is to predict oil critical rate in vertical wells using Meyer Grader correlations and determination of effect of perforated Interval, pay-zone thickness and fluid properties on critical oil rate

Summary

Introduction

Coning is a mechanism that describes the movement of water from lower to higher and/or movement of gas from higher to lower into the perforations of a producing oil well which can affect the well productivity (Wheatley, 1985).In oil and gas production, adequate planning are put in place to prevent any production-problems, such as coning problem (Anietie et al, 2017).Coning can exhibit detrimental impacts on operations, recovery, and economics in oil production. There after manual prediction of the critical rate of oil of the various coning systems was done using reservoir data and properties of fluid for the three systems concern.

Results

Conclusion