Characterizing Early Time Fracture Interference Effects and Late Time Reservoir Shape Effects Using Analytical Method
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Based on the asymptotic approximation of the diffusivity equation for slightly compressible fluids, our research team looked into its application in early time fracture interference effects and late time reservoir shape factor effects. Hydraulic fracturing is a common completion technique for modern horizontal wells. The effect of fracture interference comes into play when producing fractures influence each other’s performance due to close proximity. The issue is of great interest to the industry as fracture interference negatively affects production and cost, making optimal fracture spacing a very attractive research topic. In this work, we intend to characterize fracture interference effects using analytical methods. We found that by using the concepts of rate-normalized pressure and material balance time, we are able to calculate the individual drainage volume of each fracture.We proposed a methodology to summarize individual fracture drainage volume to represent the total well drainage volume. Moreover, the behavior of the pressure will also be investigated during the late time when the boundaries influence the pressure drop. Currently, the method to identify the average reservoir pressure is called Diez shape factor. However, Dietz shape factor did not offer an understanding of the interaction between the pressure wave and boundary. It is also limited by the fact that raw bottom hole pressure cannot be directly used to measure the average reservoir pressure. The conventional shape factor is also limited by simple geometry shape. In our research, we attempted to use the asymptotic equation of diffusivity equation to determine the new shape factor. The involved process will help us learn about pressure wave interaction and the resulted shape factors will be applicable for any reservoir shape.
Dendumrongsup, Nutchapol; Tan, Nian Wei (2017). Characterizing Early Time Fracture Interference Effects and Late Time Reservoir Shape Effects Using Analytical Method. Undergraduate Research Scholars Program. Available electronically from