Abstract
The engineering work for sustaining and enhancing oil and gas production rates starts from identifying well problems that cause low production rates, quick declines of the desirable production fluids, or rapid increases 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. Formation damage causes low productivity in both oil and gas wells. Well test analysis provides a means of estimating properties of individual pay zones and identifying formation damage. Production logging analysis identifies fluid entries to the wellbore from different zones. In addition, this chapter also provides guidelines to identifying and remedying well productivity problems commonly encountered in oil and gas wells.
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