Abstract
This work proposes an interpretation technique for injectivity tests that provides a new estimation for skin zone permeability and radius in single-layer reservoirs. A means to compute the reservoir skin factor in multilayer commingled reservoirs is also presented. Under the assumption that layer flow-rates are decoupled, the suggested method was extended to compute individual layer permeabilities and skin factors. The results indicate that this hypothesis is valid in reservoirs where layer skin factors are similar.
Highlights
Perforation and completion of the wellbore might either impair or stimulate flow around the wellbore, forming a region with modified permeability
An additional pressure change occurs. Properties inside this damaged region are grouped in a parameter called mechanical skin factor, which is defined as (Hawkins 1956): S = k − 1 ln rskin, kskin rw where k stands for the reservoir permeability, rw represents the wellbore radius, kskin and rskin denote the damaged zone permeability and radius, respectively
−3.8 radius error was more relevant, the estimates for kskin were computed with good accuracy due to the reservoir skin factor and permeability
Summary
Perforation and completion of the wellbore might either impair or stimulate flow around the wellbore, forming a region with modified permeability. Thereby, pressure derivative profile indicates the time when the waterfront overcomes the damaged zone in single-layer reservoirs. An attempt was made to extend the proposed method to evaluate individual layer permeability, skin factor and damaged zone properties in multilayer reservoirs.
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