Pressure Transient Analysis in Multiphase Multi Layer Reservoirs with Inter Layer Communication

Abstract

The focus of this study is on the investigation of multiphase flow effects on the pressure transient analysis in layered reservoirs with cross flow. Virtually all studies on the subject of multiphase well test analysis have been carried out in single layer reservoirs. However, many reservoirs are found to be composed of number of layers whose characteristics are different from each other and the wells in such reservoirs may be completed and produced from more than one layer. A novel technique is proposed based on replacing multi-phase multi-layer reservoirs with cross flow with an equivalent single phase single layer reservoir. To validate the proposed method, several reservoirs with different saturations were studied numerically and were compared with the results of the proposed model. The reservoir parameters such as phase mobilities, skin factor and average reservoir pressure are compared with actual values. It was found that reservoir parameters can be obtained accurately with the equivalent single phase single layer model. However, care should be exercised when horizontal saturation gradient is significant.

A mathematical model and semi-analytical solution for transient pressure of vertical fracture with varying conductivity in three crossflow rectangular layers

“…The methods and equations for calculating transient pressure with wellbore storage and skin effects of a non-fractured well in crossflow/no-crossflow multilayered reservoir were presented (Bourdet, 1985; Kucuk et al., 1986; Lefkovits et al., 1961; Liu and Wang, 1999; Tariq and Ramey, 1978). The transient pressure of a multilayered reservoir and the difference of interlayer communication were performed and analyzed by many researchers (Aly, 1994; Aly and Lee, 1995; Bello et al., 2016; Eisa et al., 2008; Frantz et al., 1992; Gao, 1986; Jatmiko et al., 1996; Jordan and Mattar, 2000; Lu et al., 2000; Nikjoo and Hashemi, 2012; Ryan et al., 1994; Sun et al., 2003; Wang and Wang, 2014a, 2014b; Valdes-Perez et al., 2018; Yuan et al., 2016; Zhang et al., 2001).…”