Pressure Transient Analysis of Hydraulically Fractured Wells in Multilayered Reservoirs

Description

Download Pressure Transient Analysis of Hydraulically Fractured Wells in Multilayered Reservoirs. Petroleum Engineering students who are writing their projects can get this material to aid their research work.

Abstract

New equations for bilinear, formation linear and pseudo-radial flow regimes in an infinite commingled fractured multilayered reservoir have been developed.

The equations have been extended to Tiab’s Direct Synthesis Technique that makes it easy to estimate the individual layer properties without type curve matching.

Regardless of the flow regime, the rate normalized pressure derivative with respect to the appropriate time function has been found analytically to be constant, which depicts a horizontal line on the derivative curve.

This precludes the need to calculate the slope as is conventionally done and aids in easy model diagnosis or system identification and estimation of layered parameters.

Dimensionless pressure and pressure derivative functions which were derived by Bennet et al¹ for an infinite commingled fractured multilayered reservoir have been extended to Tiab’s Direct Synthesis Technique to evaluate the average fracture and layer properties without type curve matching.

Introduction

Interpretation models cannot be used effectively in multilayered reservoir until a model has been identified for each layer. In multilayered reservoirs, the pressure and pressure derivative do not display the characteristics shapes and slopes of the individual layer model response.

This is because, the wellbore pressure is sensitive to the total system and hence pressure data alone cannot be used directly for layer model identification and subsequent estimation of layer properties.

Consequently, using parameters derived from pressure data alone to forecast production may lead to erroneous estimation of production.

Additionally, wellbore storage effect distorts pressure data which masks early flow regimes and inhibits the estimation of the layered properties.

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