Abstract
The engineering work for sustaining and enhancing oil and gas production rates starts from identifying problems that cause low production rates of wells, quick decline of the desirable production fluid, or rapid increase in the undesirable fluids. For oil wells, these problems include low productivity, sand production, excessive gas production, and excessive water production. For gas wells, the problems include low productivity, excessive water production, liquid loading, and sand production. This chapter presents a guideline to identifying problems commonly encountered in oil and gas wells. Well test analysis provides a means of estimating properties of individual pay zones. Production logging analysis identifies fluid entries to the wellbore from different zones.
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