Success in the Codell sandstone: Wyoming Geological Survey examines 119 producing Codell horizontal oil wells in Laramie County 

Codell Sandstone Attracting Oil Drillers to Wyoming

Source: State of Wyoming Geological Survey

The Codell sandstone could be a formation that operators might begin to take seriously. A new report from the State of Wyoming Geological Survey (WSGS) looks at data from 119 horizontal wells owned by six operators that have produced oil from the Codell sandstone in the northern Denver Basin in Southern Wyoming, between 2012 and March of 2017.

The study, “Codell Sandstone Oil Production Trends, Northern Denver Basin, Laramie County, Wyoming,” examines characteristics associated with the highest-producing wells in an approximately 640-square-mile study area east of Cheyenne.

Codell Sandstone Attracting Oil Drillers to Wyoming

Source: State of Wyoming Geological Survey

According to the WSGS report, the sandstone is relatively thin, averaging 20–30 feet through most of the basin, and the Codell has historically been considered uneconomical to produce given its low porosity and permeability.

But given the shale industry’s effect on how wells targeting tight formations are now drilled and completed, repeating the formula for success used in other formations could work out well for the Codell play in Laramie County, Wyoming.

WSGS report looks in detail at completion techniques that generated the highest Codell production

API number Company Number of stages Total slurry (bbl) Total proppant (lb) Lateral length (ft)
49-021-20877 EOG Resources Inc 15 72,062 3,091,080 4270
49-021-20888 Kaiser Francis Oil Co 18 58,940 2,695,050 4691
49-021-20966 Kaiser Francis Oil Co 15 39,023 2,538,000 5110
49-021-20967 EOG Resources Inc 3,192,026 3,021,660 9957
49-021-20976 EOG Resources Inc 18 30,648 3,382,180 4692
49-021-20983 Samson Exploration LLC 19 5,262 185,600 3888
49-021-21002 Samson Exploration LLC 18 58,987 3,367,628 4450
49-021-21004 Samson Exploration LLC 19 65,436 3,538,750 4172
49-021-21006 Kaiser Francis Oil Co 37 4,621,509 4,405,763 10450
49-021-21007 Kaiser Francis Oil Co 37 3,101,697 3,163,547 8937
49-021-21012 EOG Resources Inc 47 358,218 17,461,875 9570
49-021-21013 Kaiser Francis Oil Co 40 5,362,558 6,023,541 9935
49-021-21014 Kaiser Francis Oil Co 40 5,417,399 5,906,658 10099
49-021-21015 EOG Resources Inc 45 448,134 16,738,048 10095
49-021-21018 Samson Exploration LLC 18 69,064 4,701,689 4651
49-021-21026 EOG Resources Inc 52 197,002 11,861,901 9759
49-021-21027 EOG Resources Inc 55 219,455 12,601,470 10271
49-021-21028 Kaiser Francis Oil Co 40 3,618,179 4,011,214 10311
49-021-21030 Kaiser Francis Oil Co 40 93,000 4,193,625 9916
49-021-21050 HRM Resources II LLC 18 53,266 4,090,720 4562
49-021-21052 HRM Resources II LLC 18 55,844 4,074,869 4548
49-021-21053 HRM Resources II LLC 18 20,417 3,968,780 4639
49-021-21054 HRM Resources II LLC 18 53,266 4,090,720 4656
49-021-21055 Samson Exploration LLC 29 96,787 6,900,188 6720
49-021-21056 EOG Resources Inc 47 157,833 3,903,158 10363
49-021-21057 EOG Resources Inc 44 190,172 11,785,276 9539
49-021-21060 EOG Resources Inc 52 377,380 10,987,347 10244
49-021-21061 EOG Resources Inc 53 355,025 10,725,156 10231
49-021-21064 EOG Resources Inc 43 192,653 12,117,210 10221
49-021-21065 Samson Exploration LLC 33 109,983 7,885,912 7618
49-021-21066 Samson Exploration LLC 33 106,940 7,586,097 7569
49-021-21079 EOG Resources Inc 47 237,526 16,982,644 9625
49-021-21081 EOG Resources Inc 45 186,324 13,640,780 10291
49-021-21083 EOG Resources Inc 54 202,010 12,208,647 10286
49-021-21084 EOG Resources Inc 54 204,085 11,920,298 10209
49-021-21085 EOG Resources Inc 54 197,014 12,208,647 10224
49-021-21088 EOG Resources Inc 51 342,496 9,960,068 9608
49-021-21090 EOG Resources Inc 48 178,701 10,850,710 9598
49-021-21093 EOG Resources Inc 47 219,351 14,516,807 10293
49-021-21098 EOG Resources Inc 44 194,123 13,302,469 9696
49-021-21101 EOG Resources Inc 45 206,012 14,084,730 10269
49-021-21102 EOG Resources Inc 40 179,720 12,354,370 10027
49-021-21109 EOG Resources Inc 45 193,436 14,048,830 10042
49-021-21112 Kaiser Francis Oil Co 20 64,273 3,116,608 5272
49-021-21117 Kaiser Francis Oil Co 40 130,091 6,204,780 10204
49-021-21118 Kaiser Francis Oil Co 41 132,358 6,297,964 10527
49-021-21128 EOG Resources Inc 51 298,014 12,503,840 9472
49-021-21129 Samson Exploration LLC 33 111,244 7,714,200 7401
49-021-21131 EOG Resources Inc 55 206,082 12,496,397 9831
49-021-21132 Kaiser Francis Oil Co 50 131,402 6,050,372 9979
49-021-21133 Kaiser Francis Oil Co 50 129,983 6,031,154 10444
49-021-21135 Samson Exploration LLC 45 152,020 9,421,983 9852
49-021-21136 Samson Exploration LLC 33 104,317 7,548,585 7536
49-021-21140 EOG Resources Inc 43 320,882 21,388,720 9516
49-021-21143 EOG Resources Inc 55 201,784 12,571,360 10268
49-021-21146 Samson Exploration LLC 35 107,442 7,833,550 7226
49-021-21164 Kaiser Francis Oil Co 50 128,988 5,709,631 10456
49-021-21166 EOG Resources Inc 45 182,491 13,612,210 9708
49-021-21170 EOG Resources Inc 45 184,100 13,698,745 10343
49-021-21173 EOG Resources Inc 41 180,169 12,469,370 9343
49-021-21176 Longs Peak Resources LLC 20 67,530 5,022,950 4779
49-021-21178 EOG Resources Inc 45 195,033 12,286,229 9646
49-021-21180 EOG Resources Inc 47 203,310 12,700,600 10272
49-021-21181 EOG Resources Inc 36 250,538 17,815,080 9419
49-021-21182 EOG Resources Inc 47 200,107 12,078,150 9575
49-021-21184 EOG Resources Inc 43 165,100 11,093,890 9563
49-021-21203 EOG Resources Inc 45 206,730 12,677,630 10259
49-021-21226 EOG Resources Inc 53 198,308 12,175,032 10271
49-021-21227 EOG Resources Inc 55 207,219 12,562,440 10315
49-021-21228 EOG Resources Inc 55 206,078 10,272,721 10248
49-021-21246 EOG Resources Inc 44 312,918 21,833,980 9461
49-021-21247 EOG Resources Inc 43 322,764 20,914,530 9311
49-021-21249 EOG Resources Inc 43 311,524 20,966,440 10250
49-021-21254 EOG Resources Inc 37 198,330 13,460,618 10081
49-021-21291 EOG Resources Inc 45 178,743 12,477,260 9712
49-021-21292 EOG Resources Inc 40 147,849 10,113,680 9608
49-021-21293 EOG Resources Inc 40 182,266 12,463,714 10085
49-021-21294 EOG Resources Inc 46 189,887 13,850,275 9644
49-021-21361 EOG Resources Inc 45 186,324 9,013,586 10476
49-021-21362 Kaiser Francis Oil Co 40 131,192 5,555,958 10479
49-021-21398 Kaiser Francis Oil Co 40 143,590 5,122,530 10582
49-021-21399 Kaiser Francis Oil Co 50 125,661 5,704,743 10554
49-021-21400 Kaiser Francis Oil Co 20 61,322 2,831,668 5311
49-021-21414 EOG Resources Inc 43 177,951 12,978,920 9643
49-021-21436 EOG Resources Inc 44 183,860 13,333,715 9640
49-021-21453 EOG Resources Inc 43 175,050 12,135,551 9703
49-021-21520 Kaiser Francis Oil Co 51 127,898 5,569,048 10085
49-021-21521 Kaiser Francis Oil Co 51 123,898 5,447,363 10476
49-021-21522 Kaiser Francis Oil Co 51 145,356 5,926,709 10475
49-021-21543 Kaiser Francis Oil Co 50 131,581 5,913,074 9949
49-021-21558 EOG Resources Inc 45 194,377 13,769,888 10079
49-021-21569 Ward Petroleum Corporation 56 193,715 13,052,294 9860
49-021-21570 Ward Petroleum Corporation 52 206,366 10,744,766 10428
49-021-21591 Kaiser Francis Oil Co 51 129,154 5,351,348 10039
49-021-21592 Kaiser Francis Oil Co 51 128,636 5,720,908 9953
49-021-21614 Kaiser Francis Oil Co 50 122,996 6,068,543 10632
49-021-21789 Kaiser Francis Oil Co 60 129,195 5,759,892 9696
49-021-21948 Ward Petroleum Corporation 55 205,522 12,785,434 10567
49-021-22144 Kaiser Francis Oil Co 50 145,104 6,085,883 10897
49-021-22145 Kaiser Francis Oil Co 50 124,887 6,090,476 9599
49-021-22269 Kaiser Francis Oil Co 51 127,142 5,751,915 10666
49-021-22270 Kaiser Francis Oil Co 50 123,367 5,997,984 9752
49-021-22271 Kaiser Francis Oil Co 50 122,617 6,093,046 9789
49-021-22272 Kaiser Francis Oil Co 24 55,142 2,813,022 5279
49-021-22275 Kaiser Francis Oil Co 40 114,911 1,696,859 10556
49-021-22294 EOG Resources Inc 57 355,505 25,680,450 10446
49-021-22295 EOG Resources Inc 52 349,459 23,376,901 10326
49-021-22298 EOG Resources Inc 42 269,057 18,339,206 9521
49-021-22303 EOG Resources Inc 46 324,225 20,531,200 9605
49-021-22651 Samson Exploration LLC 52 308,498 18,542,092 10341
49-021-22652 Samson Exploration LLC 52 279,223 18,543,855 10269
49-021-22656 Kaiser Francis Oil Co 50 122,081 5,766,372 9976
49-021-22657 Kaiser Francis Oil Co 23 50,693 2,711,953 5324
49-021-22788 Kaiser Francis Oil Co 50 121,909 6,037,152 10021
49-021-22789 Kaiser Francis Oil Co 30 70,751 3,629,948 5907
49-021-23042 Kaiser Francis Oil Co 51 118,753 5,671,315 9985
49-021-23870 Samson Exploration LLC 55 322,829 19,622,283 10691
49-021-23871 Samson Exploration LLC 55 327,633 19,462,453 10742
49-021-23872 Samson Exploration LLC 55 291,926 19,593,654 10688

According to the WSGS, “cross-plots comparing number of frac stages and amounts of proppant and slurry to early and cumulative production indicate that the best wells were completed with at least 40 frac stages, 200,000 bbls of slurry, and between 10 million and 12.5 million pounds of proppant. They also establish that for all three completion factors, there reaches a point of diminishing economic returns beyond which operators may not see a corresponding payoff in production.”

Codell Sandstone Attracting Oil Drillers to Wyoming

Source: State of Wyoming Geological Survey

“As operators expand into more areas of the basin, they will continue to test the hypothesis that where a Codell Sandstone well is drilled is less important than how it is drilled,” the authors said.

Initial production and well completion data, including the number of hydraulic fracturing stages, total slurry volume and the total amount of material used to keep an induced hydraulic fracture open during or after a fracturing treatment (proppant), were researched from well completion reports.

The report calculates cumulative oil production from the Codell sandstone for all wells, along with each well’s first 3, 6, 9, 12 and 18 months of production.

Codell Sandstone Attracting Oil Drillers to Wyoming

Cumulative well production trends from a study of 119 wells producing oil from the Codell sandstone formation in southern Wyoming. Source: State of Wyoming Geological Survey – NOTE: production map continues below.

Codell Sandstone Attracting Oil Drillers to Wyoming

Initial Codell production per well

API number IP oil (bbl) IP oil API gravity IP GOR First year produced Reservoir
49-021-20877 455 604 2012 Codell Sand
49-021-20888 10 40.0 2014 Codell Sand
49-021-20966 189 34.0 614 2012 Codell Sand
49-021-20967 357 36.5 994 2013 Codell Sand
49-021-20976 468 2013 Codell Sand
49-021-20983 767 38.0 307 2013 Codell Sand
49-021-21002 507 37.0 590 2013 Codell Sand
49-021-21004 230 37.0 257 2013 Codell Sand
49-021-21006 595 34.0 509 2013 Codell Sand
49-021-21007 460 34.0 439 2013 Codell Sand
49-021-21012 944 2013 Codell Sand
49-021-21013 227 40.0 727 2014 Codell Sand
49-021-21014 319 40.0 1555 2014 Codell Sand
49-021-21015 376 2013 Codell Sand
49-021-21018 309 36.0 530 2014 Codell Sand
49-021-21026 991 2014 Codell Sand
49-021-21027 896 2014 Codell Sand
49-021-21028 501 40.0 34 2014 Codell Sand
49-021-21030 240 40.0 775 2014 Codell Sand
49-021-21050 298 38.0 656 2014 Codell Sand
49-021-21052 274 0.4 617 2014 Codell Sand
49-021-21053 194 345 2014 Codell Sand
49-021-21054 95 737 2014 Codell Sand
49-021-21055 609 327 2014 Codell Sand
49-021-21056 219 2014 Codell Sand
49-021-21057 956 2015 Codell Sand
49-021-21060 684 2014 Codell Sand
49-021-21061 1216 2014 Codell Sand
49-021-21064 674 2015 Codell Sand
49-021-21065 719 321 2014 Codell Sand
49-021-21066 963 36.0 341 2014 Codell Sand
49-021-21079 923 35.0 532 2015 Codell Sand
49-021-21081 466 36.5 359 2016 Codell Sand
49-021-21083 892 2014 Codell Sand
49-021-21084 1386 2014 Codell Sand
49-021-21085 1090 2014 Codell Sand
49-021-21088 886 2014 Codell Sand
49-021-21090 867 2014 Codell Sand
49-021-21093 638 36.5 826 2016 Codell Sand
49-021-21098 507 36.5 485 2016 Codell Sand
49-021-21101 687 36.0 498 2016 Codell Sand
49-021-21102 628 36.0 618 2016 Codell Sand
49-021-21109 688 36.0 624 2016 Codell Sand
49-021-21112 420 40.0 550 2014 Codell Sand
49-021-21117 1086 40.0 531 2014 Codell Sand
49-021-21118 808 40.0 296 2014 Codell Sand
49-021-21128 1089 2014 Codell Sand
49-021-21129 608 432 2014 Codell Sand
49-021-21131 1046 2014 Codell Sand
49-021-21132 165 40.0 630 2015 Codell Sand
49-021-21133 314 40.0 341 2015 Codell Sand
49-021-21135 1145 639 2014 Codell Sand
49-021-21136 702 732 2014 Codell Sand
49-021-21140 602 36.4 726 2015 Codell Sand
49-021-21143 1105 2014 Codell Sand
49-021-21146 630 344 2014 Codell Sand
49-021-21164 351 40.0 430 2014 Codell Sand
49-021-21166 424 36.5 603 2016 Codell Sand
49-021-21170 1194 35.2 590 2016 Codell Sand
49-021-21173 1333 35.2 573 2016 Codell Sand
49-021-21176 392 501 2014 Codell Sand
49-021-21178 1003 36.2 219 2014 Codell Sand
49-021-21180 721 36.6 418 2014 Codell Sand
49-021-21181 791 34.2 631 2015 Codell Sand
49-021-21182 752 2015 Codell Sand
49-021-21184 474 34.2 722 2016 Codell Sand
49-021-21203 960 2014 Codell Sand
49-021-21226 823 2014 Codell Sand
49-021-21227 1239 2014 Codell Sand
49-021-21228 1219 2014 Codell Sand
49-021-21246 575 36.1 683 2015 Codell Sand
49-021-21247 937 34.6 648 2015 Codell Sand
49-021-21249 1078 34.2 647 2015 Codell Sand
49-021-21254 1277 35.8 634 2016 Codell Sand
49-021-21291 452 34.2 754 2016 Codell Sand
49-021-21292 457 34.2 650 2016 Codell Sand
49-021-21293 361 36.5 543 2016 Codell Sand
49-021-21294 522 36.0 571 2016 Codell Sand
49-021-21361 640 35.8 619 2017 Codell Sand
49-021-21362 291 40.0 564 2014 Codell Sand
49-021-21398 327 40.0 446 2014 Codell Sand
49-021-21399 457 40.0 230 2014 Codell Sand
49-021-21400 15 40.0 5000 2014 Codell Sand
49-021-21414 550 36.0 527 2016 Codell Sand
49-021-21436 543 36.0 632 2016 Codell Sand
49-021-21453 706 34.2 752 2016 Codell Sand
49-021-21520 170 40.0 306 2016 Codell Sand
49-021-21521 182 40.0 478 2015 Codell Sand
49-021-21522 187 40.0 540 2015 Codell Sand
49-021-21543 84 40.0 655 2015 Codell Sand
49-021-21558 796 36.5 603 2016 Codell Sand
49-021-21569 516 36.0 233 2015 Codell Sand
49-021-21570 241 36.0 451 2015 Codell Sand
49-021-21591 215 40.0 363 2015 Codell Sand
49-021-21592 219 40.0 388 2015 Codell Sand
49-021-21614 140 40.0 500 2015 Codell Sand
49-021-21789 117 40.0 453 2015 Codell Sand
49-021-21948 561 37.0 421 2015 Codell Sand
49-021-22144 249 40.0 229 2015 Codell Sand
49-021-22145 375 40.0 515 2015 Codell Sand
49-021-22269 127 40.0 953 2015 Codell Sand
49-021-22270 130 40.0 954 2015 Codell Sand
49-021-22271 320 40.0 672 2015 Codell Sand
49-021-22272 159 40.0 604 2015 Codell Sand
49-021-22275 207 40.0 411 2015 Codell Sand
49-021-22294 1191 35.1 468 2015 Codell Sand
49-021-22295 743 35.2 579 2015 Codell Sand
49-021-22298 1043 34.3 545 2015 Codell Sand
49-021-22303 1036 37.4 562 2015 Codell Sand
49-021-22651 944 35.4 540 2016 Codell Sand
49-021-22652 696 35.4 589 2016 Codell Sand
49-021-22656 120 40.0 483 2015 Codell Sand
49-021-22657 73 40.0 849 2015 Codell Sand
49-021-22788 137 40.0 350 2015 Codell Sand
49-021-22789 120 40.0 417 2015 Codell Sand
49-021-23042 117 40.0 410 2015 Codell Sand
49-021-23870 888 35.2 551 2016 Codell Sand
49-021-23871 1192 35.2 688 2016 Codell Sand
49-021-23872 828 35.2 628 2016 Codell Sand

“The comparisons show that while traditional geologic criteria such as thickness and formation depth do not primarily influence production from the Codell Sandstone in the study area, wells with long laterals oriented north-south have consistently greater production than those drilled to shorter lengths and alternate directions,” said WSGS oil and gas geologist and project lead, Rachel Toner.

The study is an open file report and therefore will be supplemented periodically as new information becomes available.

WSGS analyzing Powder River basin next

“The WSGS is performing similar analyses on additional unconventional plays in the Powder River and northern Denver basins to determine the influence that completion techniques and geology have on production,” said Toner.

The 40-page report is accompanied by an Excel spreadsheet containing all well drilling, completion and production data used in the study. The report, authored by Toner and WSGS geologist Dr. Erin Campbell, is available as a free download.

 


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