• V.V.Srimannarayana
• Raffiunnisa
• Ghatty Pavan Siddharth
• Sai Deepika Kalisipudi
• Ch. Durga Seshu

The radius of investigation is one of the primary parameters that provide us with a fundamental understanding of a reservoir in petroleum reservoir engineering or in oil and well testing. Therefore, the investigation radius is a fundamental, useful, and significant parameter to assess the well’s-controlled region. In homogeneous reservoirs, the radius of inquiry is essentially considered. In homogeneous reservoirs, the investigation radius is typically calculated using an explicit function linked to the square root of time. In this study, the issue of estimating the radius of inquiry in composite reservoirs is addressed. Commercial software Saphir is used, but it is unable to interpret the radius in multi-composite zones. Then, using the calculation method for the investigation radius in a multi-zone composite reservoir derived from the investigation radius in homogeneous reservoirs, we first assumed that each zone's properties were homogeneous. The formula for multi-zone composite reservoirs is more complex and exhibits a nonlinear implicit function in time when compared to the homogeneous reservoir’s formula. We numerically calculated the dynamical investigation radii with the passage of time for both 2-zone and 3-zone composite reservoirs using the newly developed formula of the investigation radius, given a set of reservoir parameters. For the study radii were affected over time by model parameters like permeability, porosity, and total compressibility, we therefore plotted a number of relationship curves. The relationship graphs unmistakably display a reservoir's multi-zone characteristics. The relationship graphs of N-zone composite reservoirs may show (N-1) inflection points. An inflection point is a location where a pressure wave responds to the boundary between two nearby zones. Finally, to determine the investigation radius, we used actual reservoir parameters from an example well in a 2-zone composite reservoir. In conclusion, it has been demonstrated in this study that the newly derived formulas are a convenient and useful new tool for calculating the investigation radii in composite reservoir

"INTERPRETATION OF RADIUS OF INVESTIGATION IN COMPOSITE RESERVOIR", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 5, page no.c233-c271, May-2023, Available :http://www.jetir.org/papers/JETIRTHE2035.pdf

"INTERPRETATION OF RADIUS OF INVESTIGATION IN COMPOSITE RESERVOIR", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 5, page no. ppc233-c271, May-2023, Available at : http://www.jetir.org/papers/JETIRTHE2035.pdf