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- W2083658052 abstract "Abstract Interference testing with horizontal wells has become a valuable tool for characterization of heterogeneous reservoirs. However, the current methods of analysis of interference tests with horizontal wells in layered system use single-layer homogeneous model. This can result in significant errors in the estimated average reservoir properties. This paper presents the results of a study carried out to investigate the effect of layering on the pressure response at the observation well in horizontal well interference testing in a two-layer reservoir. A numerical approach is employed to study the effect of parameters like omega, kappa, vertical permeability and distance between the horizontal wells on observation well pressure response in an interference testing with horizontal wells in a two-layer reservoir. The results of the study show that the observation well pressure response form interference testing in two-layer system deviates from the equivalent single-layer system response. This deviation depends on the contrast in transmissibility and storage between the two layers. The deviation is found more pronounced when Omega is small and Kappa is large. It was also found that, as the distance between the active and observation wells increases, the deviation of the observation well response from the equivalent single-layer system response decreases. Vertical permeability has considerable effect on the observation well response when the contrast in transmissibility and storage between the layers is large. Introduction Well test analysis methods, especially pressure transient analysis, are being employed routinely to obtain detailed reservoir characterization. Among the several pressure transient analysis methods available to reservoir engineers, multi-well interference tests have become popular. These tests can provide valuable information about formation characteristics such as aerial transmissivity, storitivity, formation heterogeneities and degree of communication between wells. With the help of interference tests, reliable descriptions of the variation in reservoir properties can be obtained. This is needed to design and ensure the success of a secondary or an enhanced recovery process. Until late 90's most of interference testing were performed using vertical wells. Nowadays, the number of horizontal wells drilled is on increase, because of many advantages including better productivity in complex reservoirs than their vertical counterparts. Apart from better productivity, they are also more effective for the pressure transient tests, due to their larger area of coverage and large contact area with the formation. Even though interference testing with horizontal wells is advantageous, the analysis of the test is difficult, as the fluid flow behavior around the horizontal well is very complex. The analysis can become more difficult if the reservoir is heterogeneous and highly anisotropic. Of the several types of reservoir heterogeneities that exist, one of the simplest is a reservoir consisting of a number of layers that have distinct values of permeability; porosity and thickness stacked on top of each other and are in communication with each other. Interference testing with horizontal well has been studied by many authors, however all the studies consider single layer system1–7. Most of studies of interference testing in layered system has been with vertical wells, considering layered system with no cross flow between the layers9. They confirm that the pressure response at the observation is influenced by the cross flow at the wellbore and contrast in transmissibility and storage between the layers. The effect of layered system on active horizontal well has been studied by Kuchuk and Habashy11 and Pengbo Lu12. Gill et.al13 studied the use of vertical interference testing with dual laterals to determine effective vertical permeability in a layered reservoir." @default.
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- W2083658052 date "2007-10-30" @default.
- W2083658052 modified "2023-09-26" @default.
- W2083658052 title "Interference Testing with Horizontal Wells in Layered Reservoir" @default.
- W2083658052 doi "https://doi.org/10.2118/109023-ms" @default.
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