Back-Pressure Data on Natural-Gas Wells and Their by Edwin Lee Rawlins

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By Edwin Lee Rawlins

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Additional info for Back-Pressure Data on Natural-Gas Wells and Their Application to Production Practices. United States. Bureau of Mines. Monograph 7

Sample text

0............ 5........... 0 .......... , 3. . . . Number of back-pressure tests 31 15 6 3 H) 2 ,,: I! I I I I The information gained from back-pressure tests can be applied to the solution of such natural-gas production problems as the effect on delivery capacities of liquid in the well bore and in the producing formation, desirability of using tubing, variation in gas availability due to the variation in rate of flow stabilization, rate at which gas should be produced, effect of treating gas wells with acid, effect of shooting, accumulation of cavings in the well bore, and changes in producing characteristics of a well during its producing life.

6 ...... .. .. 599 730 775 .. 1. 6 2 ...... .. 2 ..... 3 .. 4 ... . I .. Q, M cu. ft. per 24 hours .. PI, lb. per SQ. in. absolute 893 " " .. " " " .... , Q, lb. per sq. in. 2, M cu. ft. 8 9,400 8,420 5,800 3,545 2,880 2,220 .. .. .. .. .... .. Curves F and G, fig. 8. 2 Pressure of liquid column in well bore not considered, curve F, fig. 8. 3 Pressure of liquid column in well bore considered, not shown in fig. 8. 1 , shown in table 11. The difference between the shut-in pressures at the wellhead before and after the open flow is only 4 poundS" per square inch.

8 1,986 1,376 942 1. 2 ...... 3 ..... 871' .. .. .. .. 773' 815 839 .. Cll. ft. .. 7 1,986 1,376 942 PI. P" Q, lb. per sq. in. absolute lb. per sq. in. absolute P/2 - P,'J. thousands ft. per 24 hours 880 .. .. 1 3,000 2,400 1,394 1,050 .. .. .. .. .. .. M Cll. .... Curves C, D. and E, fig. 8. Pressures of liquid column in well not considered, curve C. fig. 8. a Pressure of liquid column in well considered, curve E, fig. 8. I 2 gage after the open flow of the well. Blowing, therefore, caused a change in the column of liquid in the well bore equivalent to a pressure difference of 61 pounds per square inch.

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