Abstract

The average pressure of a gas reservoir is one of the critical parameters in the original gas-in-place (OGIP) estimation by the material balance method. It is usually calculated by the weighted average of single-well bottom-hole pressure data. There are two methods for calculating the bottom-hole pressure of a gas well: one is from bottom-hole pressure data monitoring, while the other is based on the conversion by the static wellhead pressure. This chapter focuses on introducing the bottom-hole pressure monitoring technology and bottom-hole static pressure conversion method for ultra-deep (i.e., more than 7000m) and ultra-high pressure (i.e., tubing pressure more than 100MPa) gas wells. It aims to provide reliable pressure data for calculating OGIP by the material balance method.

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