The investigation was undertaken in order to study the characteristics of correlation factor in gas lift well. The well used in the tests was 6 inches in diameter and 47 meters in depth. Compressed gas was injected into the annular space between casing and gas pipe. Air-water mixtures flowed out through gas pipe (see Fig. 1).
Plot of f factor vs. the product of the inside diameter of lift pipe and mass velocity of the fluid flowing in the lift pipe is shown in Fig. 4. Values of f factor obtained by Poettmann are smaller than f data for our tests. The data from Fig. 4 suggest that f value bas a probability of becoming smaller as the lenght of pipe string increases.
Correlation of f factor for Reynolds' Number is shown in Fig. 5. Difference between f factor curve and curve of coefficient of friction for a pipe, in which single phase fluid flow, may be resulted from slippage in gas lift well.
Plot of f factor vs. gas-water ratio is shown in Fig. 6. Volues of f factor decreases rapidly with increasing gas-water ratio and approach to the constant values corresponding to the length of producing pipe strings.
Data for the gas lift method, in which gas liquid mixtures flow out through the annular space between casing and tubing, are also plotted on the f factor curve shown in Fig. 4 (see Fig. 10). Though the effect of velocity head on f factor was calculated, the effect of the former on the latter might be neglected.
抄録全体を表示