To maximize the production and enhanced total recovery of hydrocarbons, the oil companies must have a complete understanding of the reservoir rocks and fluids present in their producing fields.

The measurement of rock properties enables us to determine its ability to allow fluids to flow and understand the way these fluids will behave when the reservoir is produced. This information provides the starting point to conduct a Formation Damage Analysis that will lead to an appropriate diagnosis in order to select the best solution. It will provide detailed explanation to the problems that well and production have and will offer basis and support to the stimulation treatment investigation and its effects.

The Formation Damage is any mechanical, chemical, biological or thermal process in a reservoir that causes a reduction in porosity and permeability.

Almost all the field operations constitute a potential source of damage for the well productivity that often results in reduced productivity of oil or gas reservoirs or reduces injectivity of injection wells, on a secondary recovery.

This paper is an attempt to supply a preparatory methodology to enable the potential risks of formation damage evaluation, trying to correlate the results in a laboratory scale with the field test.

The laboratory diagnosis, usually preliminary for stimulation, help auspiciously to avoid or decrease the risk of damage.

The study and control of formation damage requires a test design consistent with the feasibility of the operatives options and involves properties such as the knowledge of geological and petrophisics of the formation to be stimulated, fluids compatibility, operative procedures, etc.

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