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By Peter Auer (Eds.)

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Improved measurement and characterization of reservoir properties are the critical elements in designing optimal stimulation and development plans in the tight formations. 3. Stimulation Technology a. Description. The leading recovery technology for tight gas reservoirs is massive hydraulic fracturing ( M H F ) . The purpose of this technique is to overcome the problem of low permeability by creating and propping an artificial fracture far into the reservoir to enlarge the effective wellbore and provide a high permeability conduit for gas to flow to the well.

Solving the equation for either a constant rate or a constant pressure is provided for in several basic reservoir engineering texts (Slider, 1976). The purpose of this very summary introduction to gas reservoir engineering is to highlight the relative importance of the term l n ( r / r ) in the gas flow equation. 25) = / l n ( 3 0 0 0 / 3 0 ) ln(12,000) - /ln(100) In practical applications, large hydraulic fracturing designed to increase the effective wellbore radius can increase the flow rate three- to fourfold over small fractures designed to overcome wellbore damage.

Tight gas resource can help arrest this decline and provide a clean source of energy at costs competitive on a BTU basis, with world oil prices. H. Need for Future Research and Development /. Assessment of Current Performance a. Blanket Reservoirs. The most critical parameters in determining the gas flow rate and recovery from blanket-type tight gas reservoirs are in situ formation permeability and the length of the massive fracture that is effectively propped in the reservoir. Because the formation gas permeability is a given, the parameter that is most critical (as far as research and development is concerned) to the success of the tight blanket gas reservoir development is propped fracture length.

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