TUMLINSON-COFFIELD UNIT #1

Operated by MCDAY ENERGY CORP. (P-5 546675) in the BLAKEWAY (DIXON SAND) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 10606District 01Field 08713499OilCasinghead gasSaveExport
Value, all time
$618 k
Jan 1993 – May 2026
Value, last 12 filed months
$527
at the published price for each month
Months reported
401
no gaps in the span
Streams
2
oil, casinghead gas

The Railroad Commission's own record for the field this lease produces from, including the spacing rule that governs how close together its wells may be drilled.

These are facts about the field, not about this lease. The field holds 15 leases and 19 wells, and the rule below applies to all of them.

Discovered
1979-09-14
as the register files it
Field class
Oil and gas
the register's own label
Between wells
1,200 ft
minimum
From a lease line
467 ft
minimum

A drilling unit in this field needs at least 40 acres. The field rule took effect on 1985-01-28.

The Commission's schedule remark for this field reads: PER DKT. #1-83935.

What this lease produced, and what it was worth

Oil and condensate are valued on the volume the state records as disposed of; gas and casinghead gas on the volume produced. They are different columns of different files, and the difference is not cosmetic.

StreamBasisVolumeValue
OilDisposition15,659 bbl$514,974
Casinghead gasProduction38,535 Mcf$102,688
Total$617,662

15,069 Mcf of this lease's gas, across 48 months, carries no value here. No free Texas wellhead gas price exists before 1997, so those months are left out of the total rather than valued at zero. The total above is therefore a floor, not an estimate.

Wells on this lease (1)

Every wellbore the Railroad Commission records against this lease key, with the depth, the last completion and the plug date exactly as filed. A well with no plug date is not stated to be producing — the state files no such flag.

These wells centre on 28.3723, -99.6338. A lease has no coordinate of its own — that point is the mean of its wells, and they span 0.0 miles.

28.37232, -99.63375 · centre of the wells drawn, derived

What these wells add up to

Every figure below is counted over all of this lease's wells, not over the rows listed above. The Railroad Commission files two facts about a well's state — a plug date and a proration-schedule flag — and a well can carry both, so they are published as separate counts and never merged into a status.

On the schedule
0.0%
0 of 1 wells
With a plug date
0.0%
0 of 1 wells
Median depth
4,800 ft
1 wells filed one
Completion to plug
no well filed both dates

What the state filed about each well

On the RRC proration schedule
00.0%
A plug date is filed
00.0%
BothOn the schedule and plugged. Neither fact cancels the other.
00.0%
NeitherNo plug date, and not on the schedule.
1100.0%

A plug date is the date the Commission recorded the wellbore as sealed with cement and abandoned. It is the only end-of-life fact Texas files. There is no "active" flag on a well, so this page does not print one — a well with no plug date is not stated to be producing.

How deep they were drilled

The one well that filed a depth was drilled to 4,800 ft.

Completions filed
Sep 1985
1 of 1 wells

1 well

42-1273268914,800 ftSep 1985

The API number is the state's, prefixed 42 for Texas. A well is matched to this lease by the lease key the Commission files on the wellbore record, so a well that has moved between leases appears under each one it was filed against.

Every month this lease reported (401)

Volume × price = value, one row per cycle. The price columns are the same series published on the prices page — nothing here is modelled.

401 months

May 2026012106.413.05$37
Apr 20260998.932.87$26
Mar 202601289.753.15$38
Feb 202601263.503.75$45
Jan 202601259.138.00$96
Dec 20250956.664.41$40
Nov 202501258.593.93$47
Oct 202501259.383.30$40
Sep 202501562.743.08$46
Aug 202501563.933.01$45
Jul 202501266.743.32$40
Jun 20250966.483.13$28
May 20250960.553.23$29
Apr 20250062.363.54$0
Mar 20250067.704.27$0
Feb 20250070.884.34$0
Jan 20250074.324.28$0
Dec 20240068.993.12$0
Nov 20240069.052.20$0
Oct 2024122071.372.28$8,707
Sep 20240069.612.36$0
Aug 20240075.632.06$0
Jul 20240079.932.15$0
Jun 20240078.082.63$0
May 20240078.812.20$0
Apr 2024138084.451.66$11,654
Mar 20240080.301.55$0
Feb 20240076.091.78$0
Jan 20240073.023.30$0
Dec 20230071.262.61$0
Nov 20230077.892.81$0
Oct 20230085.443.09$0
Sep 2023107089.042.74$9,527
Aug 20230080.522.67$0
Jul 20230074.852.64$0
Jun 20230068.962.26$0
May 2023147070.622.23$10,381
Apr 20230078.122.24$0
Mar 20230072.852.39$0
Feb 20230075.112.47$0
Jan 20230076.533.39$0
Dec 20220076.415.73$0
Nov 20220085.005.65$0
Oct 20220087.185.86$0
Sep 2022150084.888.16$12,732
Aug 20220094.529.13$0
Jul 202200101.587.54$0
Jun 202200115.097.98$0
May 202200109.378.43$0
Apr 20221580104.226.84$16,467
Mar 202200108.885.08$0
Feb 20220091.054.86$0
Jan 20220081.844.54$0
Dec 20210071.323.90$0
Nov 20210077.435.24$0
Oct 202184079.795.71$6,702
Sep 20210069.865.35$0
Aug 20210066.024.22$0
Jul 20210070.783.98$0
Jun 20210069.493.38$0
May 20210063.483.02$0
Apr 20210060.362.76$0
Mar 20210061.302.72$0
Feb 20210057.805.55$0
Jan 20210050.412.81$0
Dec 20200044.642.68$0
Nov 20200038.772.71$0
Oct 20200036.972.48$0
Sep 20200037.091.99$0
Aug 20200039.982.39$0
Jul 20200038.371.83$0
Jun 20200034.901.69$0
May 20200016.921.81$0
Apr 20200014.751.80$0
Mar 20200030.341.86$0
Feb 20200049.881.98$0
Jan 20200057.252.09$0
Dec 20190059.012.30$0
Nov 20190055.302.75$0
Oct 20190053.472.42$0
Sep 20190055.052.66$0
Aug 20190053.112.30$0
Jul 20190056.272.46$0
Jun 20190052.782.49$0
May 20190058.482.74$0
Apr 20190062.632.75$0
Mar 20190056.803.06$0
Feb 20190050.852.79$0
Jan 20190046.033.23$0
Dec 20180046.594.19$0
Nov 20180052.934.24$0
Oct 20180061.443.40$0
Sep 20180059.543.11$0
Aug 20180059.403.07$0
Jul 20180065.142.93$0
Jun 20180060.183.08$0
May 20180065.382.90$0
Apr 20180063.842.90$0
Mar 20180061.222.79$0
Feb 20180061.782.77$0
Jan 20180062.874.01$0
Dec 20170057.272.92$0
Nov 20170055.423.12$0
Oct 20170049.292.98$0
Sep 20170047.523.09$0
Aug 20170045.373.00$0
Jul 20170043.873.09$0
Jun 20170042.493.09$0
May 20170045.373.26$0
Apr 20170047.933.21$0
Mar 20170046.772.98$0
Feb 20170050.452.95$0
Jan 20170049.413.42$0
Dec 20160048.763.72$0
Nov 20160042.492.64$0
Oct 20160046.193.09$0
Sep 20160041.553.10$0
Aug 20160041.442.92$0
Jul 20160041.622.92$0
Jun 20160045.352.69$0
May 20160042.521.99$0
Apr 20160036.561.99$0
Mar 20160033.011.79$0
Feb 20160026.472.06$0
Jan 20160027.352.36$0
Dec 20150032.362.00$0
Nov 20150038.792.17$0
Oct 20150043.552.43$0
Sep 20150042.992.76$0
Aug 20150040.162.87$0
Jul 20150048.152.95$0
Jun 20150056.152.88$0
May 20150055.212.96$0
Apr 20150049.822.71$0
Mar 20150042.892.93$0
Feb 20150044.662.98$0
Jan 20150043.433.10$0
Dec 20140054.693.59$0
Nov 20140070.464.25$0
Oct 20140078.303.90$0
Sep 20140086.164.05$0
Aug 20140089.394.04$0
Jul 20140096.564.18$0
Jun 20140098.164.74$0
May 20140094.734.73$0
Apr 20140095.944.81$0
Mar 20140095.895.06$0
Feb 20140097.406.19$0
Jan 2014162090.404.86$14,645
Dec 2013100091.824.35$9,182
Nov 20130088.853.74$0
Oct 2013160097.423.78$15,587
Sep 201300104.113.72$0
Aug 201300104.253.52$0
Jul 201300102.523.72$0
Jun 20130094.403.93$0
May 20130094.834.15$0
Apr 20130093.964.28$0
Mar 20130093.623.91$0
Feb 20130091.233.42$0
Jan 20130091.603.42$0
Dec 20120086.773.42$0
Nov 20120086.953.62$0
Oct 20120089.383.40$0
Sep 20120094.672.92$0
Aug 20120092.662.91$0
Jul 20120085.133.02$0
Jun 20120079.822.52$0
May 20120091.612.49$0
Apr 201200101.652.00$0
Mar 201200105.052.22$0
Feb 201200101.102.57$0
Jan 20120098.092.73$0
Dec 20110096.873.24$0
Nov 20110095.723.31$0
Oct 20110084.983.65$0
Sep 20110083.623.99$0
Aug 20110083.404.15$0
Jul 20110094.144.52$0
Jun 20110092.904.64$0
May 20110098.134.40$0
Apr 201100105.964.33$0
Mar 20110096.364.06$0
Feb 20110085.644.18$0
Jan 20110086.504.59$0
Dec 20100085.734.35$0
Nov 20100080.843.80$0
Oct 20100078.103.51$0
Sep 20100072.633.98$0
Aug 201089073.684.42$6,558
Jul 20100072.554.74$0
Jun 20100070.364.91$0
May 20100071.124.24$0
Apr 20100081.694.12$0
Mar 20100078.394.39$0
Feb 20100073.585.44$0
Jan 20100074.365.96$0
Dec 20090071.445.48$0
Nov 20090074.593.75$0
Oct 20090072.544.11$0
Sep 20090065.543.06$0
Aug 20090067.423.22$0
Jul 20090061.133.46$0
Jun 20090066.163.90$0
May 20090054.743.93$0
Apr 20090046.773.59$0
Mar 200902542.144.06$101
Feb 2009010332.814.63$477
Jan 200903435.865.37$183
Dec 200803637.105.98$215
Nov 200803755.496.86$254
Oct 200804875.246.92$332
Sep 2008059101.767.88$465
Aug 2008058114.228.48$492
Jul 2008065131.0811.39$740
Jun 2008063131.3313.03$821
May 2008043123.1711.57$498
Apr 2008061110.3110.45$638
Mar 200814746101.909.66$15,424
Feb 20080092.538.77$0
Jan 2008110090.388.21$9,942
Dec 20078214988.337.30$8,331
Nov 2007113091.677.29$10,359
Oct 200728082.856.92$2,320
Sep 2007126075.846.24$9,556
Aug 2007021569.066.39$1,373
Jul 2007201070.906.39$14,251
Jun 2007020162.007.55$1,517
May 2007010758.747.85$840
Apr 200710212359.617.81$7,040
Mar 2007010056.927.30$730
Feb 20075011755.108.22$3,716
Jan 20075711950.306.73$3,668
Dec 2006936556.656.92$5,718
Nov 2006010654.207.62$807
Oct 20069514754.906.01$6,100
Sep 2006015560.085.04$781
Aug 20069010168.717.34$6,925
Jul 2006013269.376.34$837
Jun 20065813966.286.38$4,732
May 20066614066.016.42$5,256
Apr 2006909364.397.36$6,480
Mar 2006431256.707.08$2,523
Feb 20060157.597.75$8
Jan 200667860.598.93$4,131
Dec 2005812554.9413.42$4,786
Nov 2005684254.6910.59$4,164
Oct 2005706358.3413.80$4,953
Sep 200505561.4512.08$664
Aug 20055214661.519.80$4,629
Jul 20058811955.697.84$5,834
Jun 200509652.337.38$709
May 20058710045.226.65$4,599
Apr 200503049.207.36$221
Mar 2005653050.377.15$3,489
Feb 200506445.226.31$404
Jan 2005829043.166.32$4,108
Dec 2004012639.866.75$851
Nov 20044716345.286.33$3,160
Oct 20046518949.706.52$4,462
Sep 20047221243.245.28$4,233
Aug 20047913042.375.55$4,069
Jul 2004014038.286.08$852
Jun 20041019736.106.43$4,270
May 2004022037.486.49$1,429
Apr 2004628934.475.86$2,659
Mar 20046219234.365.53$3,192
Feb 20046521532.455.51$3,294
Jan 20044521732.036.30$2,808
Dec 20035214030.266.30$2,456
Nov 20034610628.804.60$1,812
Oct 200310831328.174.76$4,532
Sep 2003026926.314.75$1,278
Aug 200316922129.765.13$6,163
Jul 2003011429.415.17$589
Jun 20035029028.565.98$3,163
May 2003019826.595.97$1,183
Apr 200311230626.675.41$4,642
Mar 2003025431.146.10$1,548
Feb 20037222133.487.93$4,162
Jan 20035627430.315.58$3,227
Dec 20027529126.914.85$3,431
Nov 200217414824.664.14$4,903
Oct 2002024326.464.23$1,028
Sep 200213017327.443.64$4,196
Aug 2002017825.963.16$563
Jul 2002017824.583.06$545
Jun 20026718423.733.34$2,204
May 20025418724.663.58$2,002
Apr 20025730223.653.51$2,409
Mar 20027117822.003.10$2,114
Feb 20026518418.222.38$1,621
Jan 200213627917.172.38$2,998
Dec 2001022716.932.36$537
Nov 20013722018.072.41$1,198
Oct 200114015219.782.53$3,154
Sep 20016019824.262.25$1,901
Aug 2001034924.873.05$1,066
Jul 200112715223.933.20$3,525
Jun 200111311024.563.82$3,196
May 20016117125.524.31$2,293
Apr 2001016624.685.34$886
Mar 20015626024.545.38$2,772
Feb 200117223427.755.77$6,123
Jan 2001035927.478.40$3,015
Dec 20000426.889.12$36
Nov 20008113532.215.66$3,373
Oct 200015212331.235.15$5,380
Sep 2000015931.875.19$825
Aug 200015017529.644.54$5,241
Jul 2000011628.534.09$474
Jun 20009014029.304.40$3,253
May 200017118827.263.68$5,353
Apr 2000027324.513.12$851
Mar 200017730728.422.86$5,908
Feb 2000021527.622.73$586
Jan 200011426225.272.48$3,531
Dec 199916330424.282.42$4,694
Nov 199917926923.192.43$4,806
Oct 1999012120.982.80$339
Sep 1999010821.752.62$283
Aug 199917111619.262.88$3,627
Jul 1999011417.892.37$270
Jun 1999010215.942.36$241
May 199917710515.792.32$3,039
Apr 199908615.102.21$190
Mar 199907512.471.84$138
Feb 1999122809.981.82$1,363
Jan 19990010.381.90$0
Dec 19981311239.201.77$1,423
Nov 1998013210.892.19$289
Oct 199814714812.421.97$2,117
Sep 199807512.592.08$156
Aug 1998013611.301.91$259
Jul 199840226211.742.24$5,306
Jun 1998016411.242.24$367
May 1998026712.622.21$589
Apr 1998030113.042.51$754
Mar 199818030612.802.31$3,011
Feb 1998026313.952.30$605
Jan 1998032714.702.15$705
Dec 1997032716.322.41$788
Nov 1997033318.193.09$1,028
Oct 199715030319.253.15$3,842
Sep 1997028717.742.95$848
Aug 19979330917.862.55$2,450
Jul 199713932717.582.25$3,178
Jun 1997031317.242.26$707
May 199713326718.972.31$3,139
Apr 1997027717.882.08$577
Mar 19979029718.951.94$2,281
Feb 19978927220.492.21$2,424
Jan 199710633623.483.54$3,678
Dec 19969533323.32$2,215
Nov 199614931321.97$3,274
Oct 1996031423.31$0
Sep 199614736122.22$3,266
Aug 199610843920.26$2,188
Jul 19968128919.55$1,584
Jun 1996032918.73$0
May 199611834719.43$2,293
Apr 199620240821.51$4,345
Mar 19962036019.38$388
Feb 199610329516.98$1,749
Jan 19967619917.07$1,297
Dec 199511821117.19$2,028
Nov 199513221416.00$2,112
Oct 19958720215.43$1,342
Sep 199511815416.18$1,909
Aug 199518229415.92$2,897
Jul 19951628115.24$244
Jun 19957326916.41$1,198
May 199510928517.56$1,914
Apr 199512626917.73$2,234
Mar 199512124816.44$1,989
Feb 199513626816.58$2,255
Jan 199514923415.92$2,372
Dec 199425028615.03$3,758
Nov 199418025015.90$2,862
Oct 19943223615.58$499
Sep 199417524315.29$2,676
Aug 1994023416.13$0
Jul 199412834517.56$2,248
Jun 199417038717.09$2,905
May 199419539915.88$3,097
Apr 1994036614.14$0
Mar 199436043612.46$4,486
Feb 1994035912.50$0
Jan 199434445012.66$4,355
Dec 199317714812.33$2,182
Nov 1993035614.49$0
Oct 199320039715.85$3,170
Sep 1993041715.03$0
Aug 199338435115.66$6,013
Jul 1993040915.46$0
Jun 1993039316.79$0
May 199318132717.68$3,200
Apr 1993215418.05$36
Mar 199318040718.14$3,265
Feb 199316041117.90$2,864
Jan 199318239216.93$3,081

How to read this page

The arithmetic is one multiplication per stream per month. Here it is, worked, on a real row from the table above.

May 2026 — as filed, then multipliedworked
Oil                    0 bbl  × $106.41 =         $0
Casinghead gas        12 Mcf  × $  3.05 =        $37

────────────────────────────────────────────────────
Month total                                      $37

The volumes are the state's, unchanged

Every barrel and every Mcf on this page is a number the Railroad Commission of Texas published in its monthly production query. Nothing is modelled, estimated or filled in.

The dollars are a multiplication, not a valuation

Volume × a published monthly price. It is not what the operator was paid: it takes no account of a contract, a differential, a transportation deduction, or the share any one owner holds.

Oil and gas are priced differently

Oil is a Texas realisation — the crude oil first purchase price. Gas is a benchmark, because no free Texas wellhead gas series exists at any date. The prices page publishes the difference rather than correcting it away.

A lease is not a well

The state reports oil on lease and gas on well, and this page is the lease grain. 01/O/10606 is the state's own key, not one this site invented.