Abstract
Theoretically, each Sharp Edged Seat has fully open stem travel based on the port and ball diameters. Gas lift valve 1.5” has 6 different port diameters (3/16”, ¼”, 5/16”, 3/8”, 7/16” and ½”). For each port the ball diameter is usually larger than the port diameter by 1/16”. Laboratory testing for sharp edged seats showed that the actual flow area is less than theoretically calculated area resulting from the bellows stacking before the stem reaches the fully open. Consequently, the valve stem restricts the flow and the flow rate through the valve declines. The purpose of this work is to examine the possibility of improving the efficiency of the gas lift valve by using larger ball size than conventionally used. For each port, different ball sizes were tested at different stem positions for the same condition (Injection pressure & Temperature). Results obtained from benchmark test displayed increasing in the flow rate as the ball size increases at the same stem travel.
Highlights
The objective of this work is to examine effects of the ball size on dynamic flow performance of each gas lift valve
The major initial opening force for most gas lift valves is the pressure exerted over the effective bellows area less the stem-seat contact area
Gas lift valves are can be controlled by changing the surface injection pressure and the operation mechanism of either type of gas lift valves (GLV) is the same
Summary
The objective of this work is to examine effects of the ball size on dynamic flow performance of each gas lift valve. To study effects of the ball size on the pressure distribution through the gas lift valve, numerical model is built. (Decker, et al, 1976) developed an analytical method to determine the pressure response of a bellows operated nitrogen charged gas lift valve.
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