Welltest 200: PTA Tool Kit

PTA is a Reservoir Engineering tool when we qualify induced fracture (frac’) effectiveness. Successful fracture stimulation treatments generate an Infinite Conductivity pattern, identified by a long Linear half (½) slope dominating the pressure build-up. Less effective treatments generate a Finite Conductivity pattern, interpreted by a short Bilinear (¼) slope, often transitioning towards pseudo-Radial flow. Treatment Quality Control (QC) parameters include Fracture Half-Length (xf) and Choked Fracture Skin (sc); or Fracture Half-Length (xf), Fracture Flow Capacity (kfw), and Fracture Face Skin (sf), respectively. Empirically, frac’ effectiveness appears to have been decreasing lately, perhaps due to changing popular choices, someone should study slick-water vs. cross-linked fluid effectiveness…