High pressure methane adsorption analyses for coal samples of the ... The
adsorption analyses of the four provided samples are attached in both PSI and
MPa.
High pressure methane adsorption analyses for coal samples of the Matanuska Valley coal-bed methane AK 94-CBM-I hole as follows: Seam No.1, Seam No.6, Seam No.9, and Seam No. 13.
Received 2 January 1998. Alaska Geologic Materials Center Data Report No. 278
Total of 24 pages in report.
Page 1 of24
GMC Data Report 278
Rigll Pressure Methane Adsorption Analyses
For Sa~nples: Seam Seam Seam Seam
1 Canister 1,2 6, Canister 11-14 9 Canister 20 13 Canister 34,35,37
For Dan Seamount, UNOCAL PETROLEUM LTD.
Analyses carried out by R.M Bustin 09/21/97
Page 2 of24
GMC Data Report 278
Results of Adsorption Analyses The adsorption analyses of the four provided samples are attached in both PSI and MPa units. No difficulties were encountered in any ofthe analyses although equilibrium times were long which undoubtedly reflected the high equilibrium moisture content of the samples. The dry ash free basis was determined utilizing the ash content we determined from the samples used in the analyses (rather then the ash content provided by Unocal) .. The enclosed DOS formatted 3.5 inch disk includes the reports for each sample for your convience. The reports are in EXCEL v.7 format. Please refer to Appendix 1 for an overview of the analyses technique. If you have ques1tions regarding your isotherms do not hesitate to contact me.
Table 1. Summary of EQ moisture and Langmuir volumes of the analyzed samples. SAI\1J>LE
Seam 1 Canister 1,2 Seam 6, Canister 11-14 Seam 9 Canister 20 Seam 13 Canister 343537
10.66 8.42 7.71% 9.48
12.86% 23.26% 15.04% 4.04%
11.0 14.9 15.6 13.8
Page 3 of24
GMC Data Report 278
COAL lWE:THANE ADSORPTION ISOTHERM
Sample LD. : Isotherm Temperature:
PRESSURE (PSI)
Seam 1 Cannister Moisture Content (EQ) % : 1&2 3QoC Ash Content, (dry basis), % : Helium Density glee ADSORBED METHANE (ft3/ton)
P/V
32.1 62.1 84.5 100.2 112.6 125.6 135.8 143.8 152.5
4.12 5.02 5.71 6.22 6.83 7.26 7.73 8.09 8.49
132 312 482 623 770 913 1049 11 El2 12~l5
DATA CORRECTED FOR ASH AND MOISTURE CONTENT
13:2 31:2 48:2 62:3 770 913 1049 1162 1295
42.0 81.2 110.5 131.0 147.2 164.3 177.5 188.0 199.4
I
Saturated Monolayer Volume (ft 3/ton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): • Std error of L.angmuir volume +/- 2%
=
3.15 3.84 4.36 4.76 5.23 5.56 5.91
6.18 6.49
354 0.9843 1039
10.66 12.86 1.424
Page 4 of24
GMC Data Report 278
COAL METHANE ADSORPTION ISOTHERM: Sample I.D. :
Seam 1 Cannister Moisture Content (EQ) % : 1&2 Isotherm Temperalture : Ash Content, (dry basis), % 30°C Helium Density g/cc PRESSURE (MPa)
ADSORBED
10.66 12.86 1.424
P/V
METHANE (cc/g) 0.913 2.152 3.324 4.296 5.306 6.293 7.232 8.015 8.927
1.00 1.93 2.62 3.11 3.50 3.90 4.22 4.46 4.74
0.915 1.115 1.267 1.381 1.517 1.613 1.715 1.795 1.885
DATA CORRECTED FOR ASH AND MOISTURE CONTENT
0,913 2.152 3.324 4.296 5.306 6.293 7.232 8.015 8.927
1.30 2.52 3.43 4.07 4.57 5.10 5.51 5.84 6.19
Saturated Monolayer Volume (cc/g @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume = +/- 2%
0.700 0.853 0.969 1.056 1.160 1.234 1.312 1.373 1.441
11.0 0.9843 7.1605
Seam 1, Cannister 1 and 2
14.00
t
12.00
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o 0: 10.00 trn @ ~
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Sample Cell Equilibrium Pressure (MPa)
12
14
16
Page 60f24
GMC Data Report 278
COAL METHANE ADSORPTION ISOTHERM Seam 6, Cann. 11- Moisture Content (EQ) % : 14 Ash Content, (dry basis), % Isotherm Temperalture : 30°C Helium DenSity glee
Sample 1.0. :
PRESSURE (MPa)
ADSORBED
8.42 23.26 1.503
P/V
METHANE (ee/g) 0.876 2.044 3.242 4.240 5.211 6.179 7.127 7.858 8.576 9.216
1.08 2.04 2.76 3.35 3.81 4.22 4.66 4.94 5.24 5.62
0.812 1.004 1.173 1.265 1.366 1.463 1.530 1.592 1.636 1.641
DATA CORRECTED FOR ASH AND MOISTURE CONTENT
0.876 2.044 3.242 4.240 5.211 6.179 7.127 7.858 8.576 9.216
1.58 2.98 4.05 4.91 5.58 6.18 6.82 7.23 7.67 8.22
Saturated Monolayer Volume (ec/g @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume +1- 2%
=
0.555 0.686 0.801 0.864 0.933 1.000 1.045 1.087 1.118 1.121 14.9 0.9707 8.2415
Page 7 of24
GMC Data Report 278
COAL l\1ETHANE ADSORPTION ISOTHERl\1 Sample I.D. : Isotherm Temperature:
PRESSURE (PSI)
Seam 6, Cann. 11· MOisture Content (EQ) % : 14 Ash Content, (dry basis), % : 30°C Helium Density glee ADSORBED METHANE (ft3/ton)
P/V
34.7 65.6 89.0 107.9 122.8 136.0 150.0 159.0 168.8 180.8
3.66 4.52 5.28 5.70 6.15 6.59 6.89 7.17 7.37 7.39
127 2915 470 61:5 7513 891S 10M 1140
1244 1337
DATA CORRECTED FOR ASH AND MOISTURE
50.9 95.9 130.3 158.0 179.8 199.0 219.6 232.7 247.0 264.7
127 29El 470 6Hi 75El 89El 1034 1140 1244 1337
Saturated Monolayer Volume (ft3tton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume +1· 2%
=
CONTEN~ 2.50 3.09 3.61 3.89
4.20 4.50 4.71 4.90 5.04 5.05 479 0.9707 1195
8.42 23.26 1.503
Seam 6, Cannisters 11-14 20.00
18.00
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Sample Cell Equilibrium Pressure (MPa)
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Page 90f24
GMC Data Report 278
COAL l\1ETHANE ADSORPTION ISOTHERM Sample I.D. :
Seam 9, Cann. 20- Moisture Content (EQ) % : 22 30·C Isotherm Temperalture : Ash Content, (dry basis), % Helium Density g/cc PRESSURE (MPa)
ADSORBED
7.71 15.04 1.399
P/V
METHANE (cc/g) 0.698 1.847 3.140 3.559 4.560 5.241 6.324 7.240 8.084
1.25 2.48 3.50 3.79 4.42 4.89 5.62 6.19 6.74
0.556 0.745 0.897 0.938 1.031 1.072 1.126 1.170 1.199
DATA CORRE:CTED FOR ASH AND MOISTURE CONTENT
0.698 1.847 3.140 3.559 4.560 5.241 6.324 7.240 8.084
1.62 3.21 4.53 4.91 5.72 6.33 7.27 .8.01 8.73
Saturated MonolaYElr Volume (cc/g @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): • Std error of Langmuir volume = +/- 2%
0.429 0.576 0.693 0.725 0.797 0.828 0.870 0.904 0.926
15.6 0.9341 7.1448
Page 10 of24
GMC Data Report 278
COAL l\fETHANE ADSORPTION ISOTHERM Sample I.D. : Isotherm Temperature:
Seam 9, Cann. 20- Moisture Content (EQ) % : 22 30°C Ash Content, (dry basis), % : Helium Density glce
PRESSURE (PSI)
101 2613 4515 5113 66'1 760 9H 1050 1172
ADSORBED METHANE (ft3/ton)
P/V
40.4 79.8 112.7 122.2 142.4 157.5 180.9 199.3 217.1
2.50 3.36 4.04 4.23 4.65 4.83 5.07 5.27 5.40
DATA CORRECTED FOR ASH AND MOISTURE
52.3 103.3 145.9 158.2 184.3 203.8 234.1 258.0 281.0
1011 26a 45~i
51€1 661 760 91i' 1050 117.2
3
Saturated Monolayer Volume (ft /ton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): • Std error of Langmuir volume = +1- 2%
CONTEN~ 1.93 2.59 3.12 3.26 3.59 3.73 3.92 4.07 4.17
501 0.9341 1036
7.71 15.04 1.399
Seam 9, Cannisters 20-22 20.00
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Page 12 of24
GMC Data Report 278
COAL METHANE ADSORPTION ISOTHERM Sample I.D. : Isotherm Temperature:
PRESSURE (MPa)
Seam 13, Cann. Moisture Content (EQ) % : 34,35,37 Ash Content, (dry basis), % 30°C Helium Density g/cc ADSORBED
9.48 4.04 1.370
P/V
METHANE (cc/g) 0.848 2.065 3.240 4.292 5.296 6.264 7.194 8.107 8.738
1.29 2.58 3.49 4.13 4.65 5.36 5.90 6.23 6.53
0.657 0.799 0.929 1.040 1.140 1.168 1.219 1.302 1.338
DATA CORRECTED FOR ASH AND MOISTURE CONTENT
0.848 2.065 3.240 4.292 5.296 6.264 7.194 8.107 8.738
1.49 2.99 4.03 4.77 5.37 6.20 6.82 7.20 7.55
Saturated Monolayer Volume (cc/g @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume +1- 2%
=
0.568 0.691 0.803 0.899 0.986 1.010 1.054 1.126 1.157
13.8 0.9762 7.6185
Page 13 of24
GMC Data Report 278
COAL l\1E'THANE ADSORPTION ISOTHERM
Sample I.D. : Isotherm Temperature:
Seam 13, Cann. 34,35,37 30°C
PRESSURE (PSI)
12:3 300 470 62~~
76a 900 1043 1176 1267
Moisture Content (EQ) % : Ash Content, (dry basis), % : Helium Density glee
ADSORBED METHANE (ft3/ton)
P/V
41.6 83.2 112.3 132.9 149.6 172.7 190.0 200.6 210.4
2.96 3.60 4.18 4.68 5.13 5.26 5.49 5.86 6.03
~ATA CORRECTED FOR ASH AND MOISTURE CONTENTI 1221 30C! 47C!
48.0 96.2 129.9 153.6 173.0 199.7 219.7 231.9 243.2
622~
76Si 9061 104:3 1171S 126'7
3
Saturated Monolayer Volume (ft /ton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume =+1- 2%
2.56 3.11 3.62 4.05 4.44 4.55 4.75 5.07 5.21
445 0.9762 1105
9.48 4.04 1.370
Seam 13, Cannister 34,35,37 25.00
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