부산대학교 도서관

A knowledge of the pressure exerted by the column in a gas well is necessary to determine subsurface pressures in several important areas. For example, the determination of bottom-hole pressures from surface pressures is important in reserve estimates, deliverabilities, etc., in gas reservoirs. Gas-lift installations require accurate pressure information at the valve horizons for proper functioning. Gas storage reservoirs require bottom-hole pressure data to compute deliverabilities, cushion, storage volume, etc. The relevant equations for computing the gas volume in the well are given. The difference in pressure or volume is small whether computed using average temperature or including the temperature gradient. The equations given should be more accurate and are as easy to use. Comparisons are given in tabular form.