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Home My WebLink AboutGMC Data Report No. 278 High pressure methane adsorption analyses for coal samples of the Matanuska Valley coal-bed methane AK 94-CBM-1 hole as follows: Seam No.1, Seam No.6, Seam No.9, and Seam No. 13. , tw;\;-", ;....;\"1. . .." ~ ,...... .: ~~~.~...1-...\~~ " , 5.9'"' -'?,. I ~ ':~ . 4'.2... /Q 4A1~~ ,.,.".,'T. '!, · a , .... ..~ .~..,' -#"., .. ~ . '.~ . .Jr ' .... Received 2 January 1998. Total of 24 pages in report. Alaska Geologic Materials Center Data Report No. 278 ,.---.".....-........---.--.,-....-.-....---..-...---..- GMC Data Report 278 Page 1 of 24 High Pressure Methane Adsorption Analyses For Sarnples: Seam 1 Canister 1 ,2 Seam 6, C~anister 11-14 Seam 9 Canister 20 Seam 13 (~anister 34,35,37 For Dan Seamount; UNOCAL PETROLEUM LTD. Analyses carried out by R.M Bustin 09/21/97 GMC Data Report 278 Page 2 of 24 Results of Adsorption Analyses The adsorption analyses of the four provided samples are attached in both PSI and:MFa units. No difficulties were encountered in any of the 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. SUlmmary of EQ moisture and Langmuir volumes of the anal)!zed samples. EQ ASII LAN(;. ~ .~'IlJl{E 1)llY i." ~ VOL cC/J!. Seam 1 Canister 1,2 Seam 6, Canister 11-14 Seam 9 Cani:ster 20 Seam 13 Canister 34,35,37 10.66 8.42 7.71% 9.48 12.86% 23.26% 15.04% 4.04% 11.0 14.9 15.6 13.8 Saturated Monolayer Volume (ft3/ton @ STP, daf): 354 Correlation Coefficient: 0.9843 Langmuir Pressure (PSI): 1039 · Std error of L.angmuir volume = +1- 2% 3.15 3.84 4.36 4.76 5.23 5.56 5.91 6.18 6.49 42.0 81.2 110.5 131.0 147.2 164.3 177.5 188.0 199.4 13:2 31:2 48:2 62:3 770 91:3 1049 116,2 1295 I DATA CORRECTED FOR ASH AND MOISTURE CONTENT 4.12 5.02 5.71 6.22 6.83 7.26 7.73 8.09 8.49 32.1 62.1 84.5 100.2 112.6 125.6 135.8 143.8 152.5 132 312 482 623 770 913 1049 11 E)2 125~5 P/V ADSORBED METHANE (ft3/ton) PRESSURE (PSI) Sample LD. : Seam 1 Cannister Moisture Content (EO) % : 1 & 2 10.66 Isotherm Temperature: 30°0 Ash Content, (dry basis), % : 12.86 Helium Density glee 1.424 COAL l\{ETHANE ADSORPTION ISOTHERM Page 3 of 24 GMC Data Report 278 GMC Data Report 278 Page 4 of 24 COAL METHANE ADSORPTION ISOTHERM: Sample I.D. : Seam 1 Cannister Moisture Content (EQ) % : 10.66 1&2 Isotherm Temperalture : 30°C Ash Content, (dry basis), % 12.86 Helium Density glee 1.424 PRESSURE (MPa) ADSORBED P/V METHANE (cclg) . 0.913 1.00 0.915 2.152 1.93 1.115 3.324 2.62 1.267 4.296 3.11 1.381 5.306 3.50 1.517 6.293 3.90 1.613 7.232 4.22 1.715 8.015 4.46 1.795 8.927 4.74 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 0.700 0.853 0.969 1.056 1.160 1.234 1.312 1.373 1 .441 Saturated Monolayelr Volume (cc/g @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume = +/- 2% 11.0 0.9843 7.1605 14.00 -- 12.00 -- LL c( c a:- 10.00 ..- rJ) @) C) - u 8.00-- ~ "C <U .c ~ o en "C c( 6.00 -~ <U C «0 .s:::. +J <U :E 4.00 -- 2.00 -- 0.00 o 2 Seam 1, Cannister 1 and 2 I 4 I 6 I 10 I 8 Sample Cell Equilibrium Pressure (MPa) a ~ (') t) ~ .....,.. ~ ~ (!) ÞOt:j o ~ N -.J ^^ I 12 ~ ~ (JQ (!) V\ o I--t) N ..þ... I 14 16 GMC Data Report 278 COAL :METHANE ADSORPTION ISOTHERM Page 6 of 24 Sample I.D. : Seam 6, Cann. 11- Moisture Content (EO) % : 8.42 14 Isotherm Temperalture : 30°C Ash Content, (dry basis), % 23.26 Helium Density g/ee 1.503 PRESSURE (MPa) ADSORBED P/V METHANE (ee/g) 0.876 1.08 0.812 2.044 2.04 1.004 3.242 2.76 1.173 4.240 3.35 1.265 5.211 3.81 1.366 6.179 4.22 1.463 7.127 4.66 1.530 7.858 4.94 1.592 8.576 5.24 1.636 9.216 5.62 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 0.555 0.686 0.801 0.864 0.933 1.000 1.045 1.087 1.118 1.121 1.58 2.98 4.05 4.91 5.58 6.18 6.82 7.23 7.67 8.22 Saturated Monolayer Volume (eclg @ STP, daf): Correlation Coefficient: Langmuir Pressure (Mpa): * Std error of Langmuir volume = +/- 2% 14.9 0.9707 8.2415 GMC Data Report 278 Page 7 of 24 COAL METHANE ADSORPTION ISOTHERM Sample I.D. : Seam 6, Cann. 11- Moisture Content (EO) % : 14 8.42 Isotherm Temperature: 30°C Ash Content, (dry basis), % : 23.26 Helium Density glee 1,503 PRESSURE (PSI) ADSORBED METHANE (ft3/ton) P/V 12'7 2919 470 61:5 75~3 8913 10314 1140 1244 1337 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 DATA CORRECTED FOR ASH AND MOISTURE CONTENT 12'¡r 29E) 470 6H¡ 75E¡ 89E¡ 1034 1140 1244 1337 50.9 95.9 130,3 158.0 179.8 199.0 219.6 232.7 247.0 264.7 2.50 3.09 3.61 3.89 4,20 4.50 4.71 4.90 5.04 5.05 Saturated Monolayer Volume (fe/ton @ STP, daf): 479 Correlation Coefficient: 0.9707 Langmuir Pressure (PSI): 1195 * Std error of Langmuir volume = +/- 2% Sample Cell Equilibrium Pressure (MPa) I-'C ~ (Jq (1) 00 o I-t) N .þ.. 4.00 --- 2.00 -- 0.00 .. I I I I I I I 0 2 4 6 8 10 12 14 16 a ~ (') d p) .-t- p) 10 (1) '"d o ::¡ N -.......) 00 Seam 6, Cannisters 11-14 iL c:( c 14.00 0.:- I- UJ @ 12.00 en - u u :; 10.00 4) .c ~ o ~ 8.00-- c:( CD c ns -5 6.00 - CD :: 16.00 18.00 - 20.00 GMC Data Report 278 COAL :METHANE ADSORPTION ISOTHERM Page 9 of 24 Sample I.D. : Seam 9, Cann. 20- Moisture Content (EO) % : 7.71 22 Isotherm Temperalture : 30·C Ash Content, (dry basis), % 15.04 Helium Density g/ee 1.399 PRESSURE (MPa) ADSORBED P/V METHANE (ce/g) 0~698 1.25 0.556 1.847 2.48 0.745 3.140 3.50 0.897 3.559 3.79 0.938 4.560 4.42 1.031 5.241 4.89 1.072 6.324 5.62 1 126 7.240 6.19 1.170 8.084 6.74 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 0.429 0.576 0.693 0.725 0.797 0.828 0.870 0.904 0.926 Saturated Monolaye!r Volume (cclg @ STP, daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume = +/- 2% 15.6 0.9341 7.1448 GMC Data Report 278 Page 10 of24 COAL METHANE ADSORPTION ISOTHERM Sample I.D. : Seam 9, Cann. 20- Moisture Content (EQ) % : 22 7.71 Isotherm Temperature: 30°C Ash Content, (dry basis), % : 15.04 Helium Density glee 1.399 PRESSURE (PSI) ADSORBED METHANE (ft3/ton) P/V 10'1 2613 45~5 5113 66'1 760 917 1050 1172 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 CONTENT 1011 26a 45S 51€1 661 760 91i' 1050 117:2 52;3 103.3 145.9 158.2 184.3 203.8 234.1 258.0 281.0 1.93 2.59 3.12 3.26 3.59 3.73 3.92 4.07 4.17 Saturated Monolayer Volume (fe/ton @ STP, daf): 501 Correlation Coefficient: 0.9341 Langmuir Pressure (PSI): 1036 · Std error of Langmuir volume = +/- 2% 4.00 - 2.00 -- 0.00 I I I I I I 0 2 4 6 8 10 12 14 16 20.00 18.00 --- 16.00 iL ~ 14.00 -- 0.. I- U) @) 12.00 C) U u :;;- 10.00 Q) .c ~ o ~ 8.00-- « Q) c: tU :5 6.00-- Q) ~ Seam 9, Cannisters 20-22 a ~ n d P' -- P' ~ '"d o ~ tv .-..J 00 ~ ~ (JQ (1) ....... ......... o Þ--I) tv .þ. Sample Cell Equilibrium Pressure (Mpa) GMC Data Report 278 Page 12 of24 COAL METHANE ADSORPTION ISOTHERM Sample I.D. : Seam 13, Cann. Moisture Content (EO) % : 9.48 34,35,37 Isotherm Temperature: 30°C Ash Content, (dry basis), % 4.04 Helium Density glee 1.370 PRESSURE (MPa) ADSORBED P/V METHANE (cc/g) 0.848 1.29 0.657 2.065 2.58 0.799 3.240 3.49 0.929 4.292 4.13 1.040 5.296 4.65 1.140 6.264 5.36 1.168 7.194 5.90 1.219 8.107 6.23 1.302 8.738 6.53 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 0.568 0.691 0.803 0.899 0.986 1.010 1.054 1.126 1.157 Saturated Monolayer Volume (cc/g @ STP daf): Correlation Coefficient: Langmuir Pressure (MPa): * Std error of Langmuir volume = +1- 2% 13.8 0.9762 7.6185 GMC Data Report 278 Page 13 of24 COAL :METHANE ADSORPTION ISOTHERM Sample LD. : Seam 13, Cann. Moisture Content (EO) % : 9.48 34,35,37 Isotherm Temperature: 30°C Ash Content, (dry basis), % : 4.04 Helium Density glee 1.370 PRESSURE (PSI) ADSORBED P/V METHANE (ft3/ton) 12:3 41.6 2.96 300 83.2 3.60 470 112.3 4.18 62~2 132.9 4.68 76a 149.6 5.13 900 172.7 5.26 1043 190.0 5.49 1176 200.6 5.86 1267 210.4 6.03 DATA C.ORRECTED FOR ASH AND MOISTURE CONTENT 12~\ 300 47CI 622~ 76S. 9061 104:3 11713 126'7 48.0 96.2 129.9 153.6 173.0 199.7 219.7 231.9 243.2 2.56 3.11 3.62 4.05 4.44 4.55 4.75 5.07 5.21 Saturated Monolayer Volume (ft3/ton @ STP, daf): 445 Correlation Coefficient: 0.9762 Langmuir Pressure (PSI): 1105 * Std error of Langmuir volume = +1- 2% .......... +::- o ~ N +::- Sample Cell Equilibñum Pressure (MPa) 16 I 14 I 12 I 4 I 2 I 10 I 8 I 6 ~ ~ (JQ ('D o s: () t:1 ~ .-+- ~ ïO ('D 'U o ::¡ N -......) 00 Seam 13, Cannister 34,35,37 o 0.00 5.00 - LL « c 0: t- en @ 15.00 C) è3 ~ "C <U .c ~ o ~ 10.00 -- « <U c: co .c ... <U ~ 20.00 25.00 ALASKA'-'L. AND GAS CONSERVATION CO~~JSSJON WELL. ~OMPL~ET,I~N OR RECOMPLErlON 111:::PORT.A~_D _~OQ . t. SUfi,'. of W.U ClwUIe.tt!&fI of Sttvlc. ~.II OIL. CJ GA!O SUSHNCfO 0 ABANCONIr;) 'Ji( u"vlce 0 I. L N ttI\. Of OþHlfOt , oS +~ {.Q 1I..P .?r\ ~ ~"'. , D'; 1/.,( 0: 1_ ~ ~~ ~ ~. Acid,... " ,\ , a. AP t Nun'lDlf '.. P,o.~,,~ tOìo~1 t4.,,^I"..\...t'~,Þt\ø AJ< '195/0 10-_ .c. I..oar'on DI WIll .t ...tfau '\J ¡ , D. Unit OJ' LdJA Nam. A. Top "~'IQ1.~1 F~ L) 3 3 'f:' SL./ Sc.~ 3I,TlB\J ,,Q. ¡W, S"'- iQ.w~{~" .. ,. , ~/<~I(- c.~rY1-1 , 1, f:i.1G and '001 íÿc.....e~ FM-· .,. Permit Nu""'" C¡'-b 9 ..""--;,......... At To~., (tpth ~~~ . S. II.yarkll' 'n f.,c (j(loi<:lu Ka, DF, .te.l 6. Luu O".,,..tloft I~ S.'tl.1 No. · 12. ~j;~j;"'f . u '31/~~Î·;~,n.. ~4.Da; ~t;ÿ or ,,~..' ~1_S. Wa." ~.øt'. i:.:t:s:. 16. ~.. ~_I"~' : 17. TottI C'ØU\ (MO.rv PI '... PI¡;I/ aack O'~l\h IMo.'TVQI '1. 01r.otiOMI $...rvtv 20. Oeprh ,.,~.r. usv ,.t ", n>llek"'''1 of P.",,.t,an .. J;;" 'f S f 'r~S C NO ~Z . tur MO 0 n Tv~' flactrlt Ot Othtr \"0;' ~wn . cc..l:j T~_p') s p, :2]. CÂ$INC SIZE WT, PER 'Y. C"AO e (" 6/Pt ;¡5ð~ ttS..' ß .P. c...S ( /I..")) R e ~ ) _ n pC t"'I .1:+"1' Ne,v..+( n,J~, _ ~ ""? ~ CASINO, L.INe~ ANO CEMENTING ~=CORO " - - . -, ~ SIiTIING C!PTt1 MO TOP BOTTOM -. . - } , .~ u '" .ç. ~ (.~ J G "f ~~y HOLE SI%I C!MENTING ReCORe 'l, ¥~ . ,3, oS' 't~ " AMOUNT'VLI..IO r:? t ~... P,rlOrl1tont opln te PraclwGtlon MD-tTVC of To:) Ind !OHon'l .nd 1n1lMI, sin .'u~ rwmÞ.rl NONe .26. SIZ~ flþ""ø ~8. ACID, ~ItACTUÄE, C~MeN'T SQUEII.. ETC. OEPTH INTSRVAI. IMOI AMOUNT" KINO OF M,o. rER1AL. \)$10 r - TUSlINQ ~eCORC ~ - 'Ii. _ DEPTH SIT (MO) PACKER SET (MOl - - 27. Oar. Flm PrOGwCtlon ._ .-ROOUCtlON TEn I M.thOd of OÞ.rn~ 'JlIòW1f'1.mllh. tt;. O'Ct 0·' ".1\ MOc.ltl T.utG f'RO-OUCTION FOR OI1.-aSI.. I a'û.MCF WAT!A·ISISI. CHOKE SIZ~ QAS·OIL "ATIO , . TEST pa.H~IOO. . _ , ,Iow Tubil'\O CNin,l'tluur'· CALQUU. TED . 01\..·881.. GAS-M~F I WATER.8U. 'OIL. CiRAvITY'ÞI"1 f~grrl Pr-au. :2....;fOUR RA TI! . :21. CO,.¡ OA1A _ 8rl.t dHCTiptlon ðf IhhalOn'. ¡:¡o~~r. hac-turts. løøareru dl,. Md þtt.afttl of clI,-,,' 01 ~\lr. J~Þmlt cor. Chip.. C """+',..u.. Ot"-!à/"( { C)<"e> â. -Ç.. f:¡~ .3 64.(' TO 1,1of S.' 'To;'A.,( c..o"'~ ¡ cAb ~ -H (! J. +0 ~ Go IV\ C. . (.t,¡....e· c1L~t:. +,.\^.t.1cs ~& · ._ 10..CI' "n. '.;-60 CONTlNUEO ON AfVIP\U '10' $I,~h In duÞ¡i~1t GMC Da~~~eport 278 Page 15 of24 ~ ~/' GMC Data Report 278 - .... AK 94-CBM.l t' lAS-BUILT OF CONDUCTOR I N, LOCATED WITHIN: SE1/4 SE1/4 Sec. 3' T. '8 N., A.' W., SeWARD MERIDIAN AIK. Latitude e 1 °3et~2· N Long Itude 149°31 '02- W' (NAC 1927) , Y == 2,776,281 ' X;: 584.064 ZONE==4 Top of Conductor 7/8/94 = 406' MEP ",-. Page 16 of24 31 32 ",/ 200' 0-50' KZ· 100' ---.. . 1/4 COR. Recovered Bent I.P.,No Cap Q < ~ z 'a . T 1e to¡ T ~7 N VICINITY MAP SILVER LEAF ESTATES S¡;WÂhD M;,;::<.iC¡A~ NUMBER , SCA~E; ,'. ~ :;:' if, K 94·rRM-l <:r 301 x SO' VISQUE EN.LI NED J .'-, -"11S'-n-.._.._.,. RESERVE PIT, .'\-r~ TOBEREMOVED)>« .:. ! ~ ~ . "" /'\~ ~ :~';:~lNG ; 5 WATE~ WELL I ~ ~ M I . i PRIVATE. ! LAND DONALD CHURCH OWNER, I 7/8/94 I Reoover.d bent iron pipe ~100'-:r1 32 Itt'\brallcap. tt- l 4l-- O-SO' ~ - T 1 S N - ", T 17 N 200 6 5 o Found 31 Aluminum monument no marks . Found 5/S' rebar with Aluminum cep marked DB 100' R. P. , 14 Cor. 4118-5 77. (typical) I HEREBY CERTIFY THAT AM PROPERLY R¡;~ISTEF\ED AND LICENSEO TO PRACTICE LAND SURVEYING IN THE STATE OF ALASKA, THATTHI$ AS..BUILT REPRESENTS A SLJRVEY MADe BY ME OR UNOE~ MY OIRECT SUPERVISION, THAT THE MC)NUMeNTS SHOWN HEREON ACTUALL Y EXIST AS DESCRIBED, AND THAT AI L DIMENSIONS AND OTHER DETAIL.S ARE CORRECT. , I ,)r Á CATE "/ ~ 7,/' 9, R EGIST~ATION NO. eBBS 1 Pr1EPARED BY: DATE OF PREPAREO FOR: LEGAL DESCRIPTION: ~'..JRV.Yi 3te.\o of ~\..k. ac,¡~ SC,¡.c g;c. 21 Depar1ment of Na1ural ROlourcle 1 TOW~SHIÞ: ,aN Ju!y 8,1 ie4 I Divi.i~n of Oii a.nd Gas ; R.AN~E: ,w ~.O. ê3o): , 07034 ~ l AI'\~hcr.g.. AK ees, O·10~_: SHEET: ] , _.__---..,...."1 GMC Data Report 278 Well AK·94-CBM #1 COAL METHANE ADSORPTION ISOTHERM Sec 31 T18N·R1W ,Sample I.D. : Se:am 1 Cannister 1 & 2 , Isotherm Temperature 30~!C De,pth 522' to 524' Gas Yield 63 sef/ton PRESSURE (PSI) Moisture Content (EQ) % : Ash Content, (dry basis), % : Helium Density glee ADSORBED METHANE (ft3/ton) 132.4028729 312.0592965 482.1754564 623.0181866 769.5389164 912.7438045 1048.858256 1162.494647 1294.723873 32.12770473 62.10643714 84.50242913 100.1707536 112.5997857 125.6378853 135.7711957 143.7589019 152.5172002 Page 17 of24 10.66 12.86 1.424064 PI V 4.121143 5.024589 5.706054 6.219562 6.834284 ' 7.264877 7.72519 8.086419 8.489035 DATA CORRECTED FOR ASH AND MOISTURE CONTENT 132.4028729 312.0592965 482.1754564 623.0181866 769.5389164 912.7438045 1048.858256 1162.494647 1294.723873 42.00798213 81.2061155 110.4895778 130.9764038 147.2277533 164.2754776 177.525099 187.9692755 199.4210253 Saturated Monolayer Volume (ft3/ton @ STP, daf): COl'relation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume = +1- 2% 3.15185 3.842805 4.36399 4.756721 5.22686 5.556178 5.908225 6.184493 6.492414 353.6433 0.984256 1038.548 GMC Data Report 278 Well AK·94·CBM #1 COAl. METHANE ADSORPTION ISOTHERM See 31 T18N·R1W Sample I.D. : Seam 6, Cann. 11-14 IsothermTemperature 30gC Depth 893' to 897' Ga~ Yield 177 sef/ton PRESSURE (PSI) Moisture Content (EO) % : Ash Content, (dry basis), % : Helium Density glee ADSORBED METHANE (ft3/ton) 127.0870967 296.4365408 470.2341406 614.8963432 755.7365649 896.2449136 1033.662084 1139.675904 1243.778986 1336.683134 34.74673771 65.55224685 89.02788105 107.9321596 122.8141193 135.9606702 150.0053803 158.9678649 168.7611434 180.8281534 Page 18 of24 8.42 23.26 1 .503062 PIV 3.657526 4.522142 5.281875 5.697063 6.153499 6.591942 6.890833 7.169222 7.370055 7.392008 DATA CORRECTED FOR ASH AND MOISTURE CONTENT 127.0870967 296.4365408 470.2341406 614.8963432 755.7365649 896.2449136 1033.662084 1139.675904 1243.778986 1336.683134 50.85880813 95.94883906 ' 130.3101303 157.9803273 179.7630552 199.0056647 219.56291 o~ 232.6813011 247.0157251 264.6782104 Saturated Monolayer Volume (ft3/ton @ STP, daf): COI'relation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume = +1- 2% 2.498822 3.089527 3.608577 3.892234 4.204071 4.503615 4.707817 4.898012 5.035222 5.05022 452.5862 0.989984 1129.701 GMC Data Report 278 Well AK·94·CBM #1 COAL, METHANE ADSORPTION ISOTHERM Sec 31 T18N·R1W Sample I. D. : Isotherm Temperature: PRESSURE (PSI) 101; 19783915 267.86080514 455,3822906 516.2608189 661.318862:7 760.1130141 917.2264845 1050.060418 1172.49652~5 101 .19783Ø5 267.86080S4 455.3822906 516.26081 a9 661.31886~~7 760.1130141 917.2264845 1050.0604 ¡18 1172.4965~35 Seam 9, Cann. 20-22 30QC Depth 1064' to 1068' Gas Yield 163 sef/ton Moisture Content (EO) % : Ash Content, (dry basis), % : Helium Density glee ADSORBED METHANE (ft3/ton) 40.40906229 79.78816926 112.7176817 122.1886497 142.3650711 157.450101 180.8776874 199.2955444 217.0996544 Page 19 of24 7.71 15.04 1.398678 P/V 2.504335 3.357149 4.040025 4.225113 4.645233 4.827644 5.070976 5.26886 5.40073 DATA CORRECTED FOR ASH AND MOISTURE CONTENT 52.30946574 103.285656 145.9128566 158.1730093 184.2913542 203.8189009 234.1458737 257.9877598 281.0351514 Saturated Monolayer'Volume (ft3/ton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume = +1- 2% 1.934599 2.593398 3.12092 3.2639 3.588442 3.729355 3.917329 4.070195 4.172064 501.0922 0.934066 1036.264 444.9592 0.976173 1104.974 2.559774 3.111965 3.617534 4.051385 4.439309 4.549754 4.748429 5.06987 5.210499 531 245 122.9881164 48.04647717 299.5163541 96.24669032 469.8892224 129.8921223 622.4803223 153.646297 768.1625492 173.0365061 908.526128 199.6868505 1043.419418 219.7399224 1175.890463 231.9369914 1267.383353 243.2364697 3000 445 Saturated Monolayer Volume (ft3/ton @ STP, daf): Correlation Coefficient: Langmuir Pressure (PSI): * Std error of Langmuir volume = +1- 2% DATA CORRECTED FOR ASH AND MOISTURE CONTENT 2.959961 3.59848 4.183088 4.684765 5.133336 5.261048 5.490783 5.862477 6.025091 9.48 4.04 1.36991 Page 20 of 24 41.55059346 83.23413779 112.3307074 132.8733176 149.6419705 172.6891883 190.0310849 200.5791101 210.350899 122.9881164 299.5163541 469.8892224 622.4803223 768.1625492 908.526128 1043.419418 1175.890463 1267.383353 P/V ADSORBED METHANE (ft3/ton) PRESSURE (PSI) Moistu re Content (EQ) % : Ash Content, (dry basis), % : Helium Density glee Seam 13, Cann. 34,35,37 302C Depth 1235' to 1240' Gas Yield 245 sef/ton Sample I.D. : Isotherm Temperature: Well AK-94-CBM #1 COAL METHANE ADSORPTION ISOTHERM Sec 31 T18N-R1W GMC Data Report 278 GMC Data Report 278 Page 21 of24 APPENDIX 1 Your Isotherms To help you interpret you data I have prepared a few short paragraphs to tell you how your data was obtained. 'If you have any questions please do not hesitate to contact us. Obtaining and interpreting isotherm data and Langmuir Isotherms Your high,.pressure methane, carbon dioxide or mixed gas adsorption analyses were performed using a high-pressure volumetric adsorption technique similar to that described by Mavor et al. (1990). Your isotherms were measured on a custom made apparatus modeled after an apparatus, designed and built at CSIRO Lucus Heights, Australia. The apparatus is based on Boyles Law. Simply, a known volume of gas within in a reference cell is used to dose a sample cell containing your sample. The amount of gas adsorbed, using the real gas law, in the sample cell is then determined based on change in pressure in the sample cell. Normally 100 g of sample is utilized in such analyses. Tests show that reproducible results can be obtained on samples as small as 25 g but the larger samples yield bettler quality data. Our instrument has four sample cells. The pressures in the reference and four samples cells are measured using pressure transducers that alre interfaced to a computer equipped with specialized boards and software for this purpose. The computer monitors the transducers and determines when equilibrium is reac:hed as well as controls valves and switches for dosing and purging the references and sample cells. Following dosing of the sample cell with a known volume of gas, the pressure in the sample cell is monitored. As gas is adsorbed by the sample the pressure drops until equilibrium is reached; that is no more gas can be adsorbed by the samples at that particular specified pressure. Critical to obtaining quality isotherms is deciding when the: equilibrium is reached. In our instrument we set a stringent test- equilibrium is reac~hed only when the pressure in the cell does not change over a designated period of time. When equilibrium is reached the sample is dosed at the next highest pressure. We normally collect 12 separate pressure points selected such that the best Langmuir regression can be obtained. We can of course collect data at points selected by the client before hand. The temperate of the references and sample cells is maintained at the exact temperate requested by the client. The temperate is maintained within a tolerance less than 1/10 of one degree centigrade. For a routine adsorption analyses about five to six days are required once equilibrium moisture has been determined. GMC Data Report 278 Page 22 of 24 How we assure the quality of the isotherms- potential sources of e"or and recognition of problems With an apparatu~¡ such as ours the only potential error is a change in the characteristics of the pressure transducers, a leak in the system or non-isothermal conditions. Our pressure transducers were selected for optimum performance within the range of pressures that isotherms are collected. They are not only factory guaranteed we cross- calibrate our transducers periodically to test for drift. The accuracy of our transducers is better than 0.001 :MPa. Prior to running your experiment the reference and sample cells and plumbing are pressure tested for leaks using helium. We do our leak tests at 7 :MPa. Because the He molecule is smaller than either methane or carbon dioxide (the gases we normally do adsorption work with) using He assures us of a leak free system. If a leak were to develop during analyses (one never has) it would be readily apparent because the cells would never come to equilibrium at a given pressure (the leak would appear as an infinitely adsorbing material). Non-isothermal conditions are not a potential problem utilizing our instrument unless a prolonged power failure occurs. Our bath temperature is maintained by a submerged electric heater and a circulating power. The heater is controlled by a temperature controller to a tol~~rance less than 1/10 of a degree centigrade. We' periodically nm a standard sample in our apparatus to confirm that all is well. Understanding ~our Isotherms The classic theory used to describe the Type I isotherm for microporous materials with small external surface area is based on the Langmuir equation (1916). The Type I isotherm displays a steep increase in adsorption at low relative pressures due to enhanced adsorption caused by the overlapping adsorption potentials between walls of pores whose diameters are cOITlmensurate in size with the adsorbate molecule. The Type I isotherm then flattens out into a plateau region at higher relative pressure, which is believed to be due to the completion of a monolayer of adsorbed gas. The micropore volume is then thought to be filled by only a few molecular layers of adsorbate, and further uptake is limited by the dimensions of the micropores. The Langrnuir model assumes that a state of dynamic equilibrium is establish~d between the adsorbate vapor and the adsorbent surface and that adsorption is restricted to a single monolayer (Gregg and Sing, 1982). The adsorbent surface is thought to be composed of a regular array of energetically homogeneous adsorption sites upon which an adsorbed monolayer is assumed to form. The rate of condensation is assumed to be equal to the rate of evaporation from the adsorbed monolayer at a given relative pressure and GMC Data Report 278 Page 23 of 24 constant temperature. The Langmuir equation was developed with these assumptions and takes the following form: ..E= -L+~ V BVm Vm where P is the equilibrium pressure, V is the volume of gas adsorbed at equilibrium, V m is the volume of adlsorbate occupying a monolayer, and B is an empirical constant. A plot ofPN Vs relative pressure should yield a straight line whose slope will yield V m from which the surface area may be obtained. As shown on your figures a best fit Langmuir isotherm and the data points have been plotted for each sample. The Langmuir Isotherm can be written: V(P) = ~~p P = gas pressure V(P) = predicated amount of gas adsorbed at P VL = Langmuir volume parameter PL = Langmuir pressure parameter The difference between the measured amount of gas adsorbed (V(P») and that predicted using the Langmuilr Equation (Vi(P») is a measure of error and is given as: Err(P) = Vi(P) - yep) This error may be positive or negative. The square of the error is always positive and is a measure of the how well the calculated isotherm matches the data. This error can be calculate for each point and summed giving a measure of the overall error: N 2 SSE = LEr~ ;=1 I N= number of measured points. We express the goodness of fit of the isotherm by calculation the correlation coefficient between the measured points and the calculate points. Our results generally yield correlation's that are better than r2= 0.99. and standard errors ofLanmuir volumes off 2%. The errors fbr your samples can be found on the bottom of the data sheets that are included with each sample. GMC Data Report 278 Page 24 of 24 In examining your data you should note that adsorption values are provided for the raw data and corrected for ash content. The ash content will also be corrected for equilibrium moisture content. When does adso1J,'Jtion not fit a Langmuir Equation? The Langmuir equation has been found to provide an excellent fit for almost all samples under most reservoir conditions. The Langmuir equation is based on the assumption of monolayer filling of pores. Under conditions of low temperature and very high pressures however multilayer pore filling takes place which results in a deflection (step) in the isotherm which marks the onset of multilayer pore filling. This 'step' occurs at pressures and temperatures ¡that are not realistic in terms of natural reservoirs however since we routinely run our isotherms to pressures in excess of 1211Pa and many clients request low temperatures, the step may be present in your isotherm. If we encounter multilayer pore filling in your samples the regression will have been performed with out including the 'step'; although the data points are included in the plot and data set. References Langmuir, I., 1916. The constitution and fundamental properties of solids and liquids. Journal of the Alnerican Chemical Society, 38: 2221-2295. Mavor, MJ., Ow(m, L.B., and Pratt, TJ., 1990. Measurement and evaluation of isotherm data; Proceedings of 65th Annual Technical Conference and Exhibition of the Society of Petroleum Engineers, SPE 20728: 157-170.