--> Formation Damage Disaggregation in Gas Well and Sensitivity Reservoirs From Build Up Well Test

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Formation Damage Disaggregation in Gas Well and Sensitivity Reservoirs From Build Up Well Test

Abstract

Abstract

The main objective of the total formation damage disaggregation is to identify which are the relevant components of this damage.

This paper presents a methodology for disaggregation of formation damage in three components: non-Darcy flow, geomechanical and mechanical damage, considering only a buildup test. Methodology is made up by two steps: first, total skin is broken up in both non-Darcy flow and another damage, (called prime damage), interpreting buildup test with the Spivey's model. Then, prime damage is separated in geomechanical and mechanical damage using a permeability modulus based model.

The methodology has been applied to wells in the Colombian Foothills field, which have presence of natural fracture systems and show sensitivity to stresses, as well as high flow rates. Results show that one or two damages prevail in the wells analyzed. On the other hand, well test interpretation permits characterizing the near wellbore area geomechanically and from a point of view of non-Darcy flow.

Contribution of this formation damage disaggregation methodology is to identify the major damage components, allowing choice the most appropriate stimulation operation which could be apply on the well to improve the well productivity. Besides, this methodology seeks decrease the uncertainty in damage remediation with a minimum amount of information.