Abstract
This paper discusses a new technique for interpreting log-log plots of pressure and pressure derivatives of vertically fractured wells in closed systems without using type curve matching. For the uniform flux fracture case, pressure derivative plots for various x e x f ratios reveal three dominant flow regimes. During early times the flow of fluids is linear and can be identified by a straight line of slope 0.5. The linear flow line is used to calculate the half-fracture length. The infinite acting radial flow regime, which can be identified by a horizontal straight line, is dominant for x e x f > 8 . This flow regime is used to calculate permeability and skin. The third straight line, which corresponds to the pseudosteady flow regime, has a unit slope. This line is used to calculate the drainage area and shape factor. For the infinite conductivity fracture case, pressure derivative plots reveal a fourth dominant flow regime, called here the bi-radial flow. This flow regime, which can be identified by a straight line of slope 0.36, also can be used to calculate the half-fracture length and permeability.
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