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

By Edwin Lee Rawlins

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Read Online or Download Back-Pressure Data on Natural-Gas Wells and Their Application to Production Practices. United States. Bureau of Mines. Monograph 7 PDF

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

Example text

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. Curve C is based on back-pressure data obtained before the open flow of the well, without considering the effect of liquid in the well bore on pressures, and curve D is based on back-pressure data after the open flow of the well. The data from which curve C was plotted then were corrected for the pressure of 61 pounds per square inch exerted by the column of liquid, as shown in table 10; and these corrected data were used to determine curve E, which coincides practically with 41 APPLICATION TO PRODUCTION PROBLEMS curve D.

L1 % 1 lJi IV2 Te:nperature, OF. 1 , Calculation of rates of flow 1. 2. 3. 4. 64 X X X X 525 525 525 525 = 5,090 M cu. = 8,740 M cu. = 12,840 M cu. = 17,180 M cu. ft. ft. ft. ft. per per per per 24 24 24 24 hom. hours. hours. hours. Pressures Shut-in wellhead Read- pressure, ing lb. per sq. in. absolute, (Pe) I 433 2 3 4 .. .. Pressure of gas column, lb. per sq. in. Shut-in formation pressure, lb. per sq. in. absolute, (PI) Wellhead working pressure, lb. per sq. in. absolute, (P w ) 17 450 418 404 383 356 ..

In. Back pressure at sand, lb. per sq. in. ) 13 22 32 45 nil nil 1 3 418 404 384 359 17 16 15 14 435 420 399 373 Plotting data Reading 1 ........... 2 ........... 3 ........... 4 ........... 2, thousands PI2 _ p,2, tholl8ands M cu. ft. 4 5,090 8,740 12,840 17,180 .. .. PREPARATIONS FOR BACK-PRESSURE TEST Measurements of gas delivery were made with a critical-flow prover. 26 The installation of equipment for the back-pressure test is shown in figure 2. Critical-flow prover A was connected to the " top" gate valve.

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