Fluid-leakoff delineation in high-permeability fracturing

Starting from the original concept proposed by Carter, Howard and Fast, thi s paper reviews the description of fracturing fluid leakoff in view of mode ling flow in porous media. It is shown how various linear leakoff models ha ve been developed and why a new, radial leakoff concept is necessary for hi gh-permeability fracturing, where the injection time is commensurable to th e response time of the reservoir. Using Laplace space methods, the new radi al leakoff law is calculated and compared to linear leakoff. For comparison purposes a calibration test executed in high-permeability formation is int erpreted using several approaches, namely: linear leakoff+bulk leakoff coef ficient; filter-cake resistance+linear flow in the formation and finally, f ilter-cake resistance+radial flow in the formation.