Analysis of Simple Well Tests

•Objectives of well tests

• •Types of well tests
• •Basic analysis of:

-- Pressure drawdown tests
-- Pressure build-up tests
-- Well interference tests

Types of Well Tests

Producing wells Injection wells

Pressure drawdown Pressure fall off

• Multiple rate Multiple rate
• Pressure build-up Injectivity
• Well interference Well interference
• Drill stem Reservoir limit

Objectives of Well Tests

• •Gather transient fluid flow and pressure data in one or more wells simultaneously
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• •Analysis aim at understanding and quantifying reservoir and aquifer behavior
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• •Provide knowledge about reservoir size and continuity
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• •Provide estimates of in-situ properties such as porosity, permeability, transmissibility, productivity, injectivity and formation damage near wellbores

Properties of Reservoir Rocks

•Porosity and absolute permeability

• •Factors that affect rock permeability
• •Compressibility, density and thermal properties
• •Relative permeability
• •Capillary pressure
• •Rock wettability •Tortuosity