WEST SUNDOWN UNIT

Operated by OXY USA EOR, LLC (P-5 103869) in the SLAUGHTER field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 70442District 8AField 83991001Hydrogen sulphide fieldOilCasinghead gasSaveExport
Value, all time
$459.7 M
May 2016 – May 2026
Value, last 12 filed months
$65.0 M
at the published price for each month
Months reported
121
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 160 leases and 6,532 wells, and the rule below applies to all of them.

Discovered
1937-12-31
as the register files it
Field class
Oil
the register's own label
Between wells
880 ft
minimum
From a lease line
440 ft
minimum

A drilling unit in this field needs at least 17 acres. The field rule took effect on 1993-02-02.

The register flags this field for hydrogen sulphide. That is a poisonous gas that occurs naturally in some formations. The flag is a property of the field as the Commission records it. It is not a measurement taken at this lease, and it is not a statement that gas is escaping anywhere.

The Commission's schedule remark for this field reads: “UNITS MAY BE 17.7 AC. OR UP TO 35.4 AC.”

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
OilDisposition6,471,682 bbl$443,878,708
Casinghead gasProduction4,652,455 Mcf$15,811,382
Total$459,690,091

Wells on this lease (232)

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 33.4760, -102.4939. A lease has no coordinate of its own — that point is the mean of its wells, and they span 4.0 miles.

33.47565, -102.48914 · centre of 200 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
9.5%
22 of 232 wells
With a plug date
9.5%
22 of 232 wells
Median depth
5,033 ft
176 wells filed one
Completion to plug
6.5 years
median over 14 wells

What the state filed about each well

On the RRC proration schedule
229.5%
A plug date is filed
229.5%
BothOn the schedule and plugged. Neither fact cancels the other.
229.5%
NeitherNo plug date, and not on the schedule.
21090.5%

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

Total depth in feet, 176 of 232 wells. Median 5,033 ft, with the middle half between 4,995 and 5,078 ft; the shallowest is 4,694 ft and the deepest 12,518 ft. The median is published rather than the mean, because a single mis-keyed depth moves a mean and cannot move a median.

When they were last completed

Last completion by decade, 177 of 232 wells, Oct 1981 – Dec 2025. This is the LAST completion filed on each wellbore, not the first — a well recompleted in 2019 counts once, in the 2010s.

Completions filed
Oct 1981 – Dec 2025
177 of 232 wells; 55 filed none
Plug dates filed
Feb 2017 – Aug 2025
22 of 232 wells; 210 filed none

Last completion to plug: a median of 6.5 years across the 14 wells that filed both dates, with the middle half between 3.5 years and 13.1 years. The gap is the distance between two filed dates. It is not a statement of how long the well produced.

200 of 232 wells

42-219016531335,075 ft—Dec 2019Yes
42-219017642095,088 ft—Oct 2019Yes
42-219017721965,062 ft—Oct 2019Yes
42-219017802025,078 ft—Oct 2019Yes
42-219032281435,006 ft—Jun 2019Yes
42-219315710345,007 ft—Feb 2017Yes
42-219323832015,044 ft—Oct 2019Yes
42-21936048215R5,060 ft—Jul 2018Yes
42-21900041074————
42-219000431455,008 ft———
42-21900066178————
42-21900173004————
42-21900176003————
42-21900308066————
42-21900312057————
42-21900374024————
42-21900599036————
42-21900601022————
42-21901645187————
42-21901685096————
42-21901698167————
42-21901704113————
42-21901705091————
42-219017630865,000 ftDec 2025——
42-219374602255,114 ftNov 2025——
42-219017300094,988 ftOct 2025——
42-219001091795,070 ftSep 2025——
42-219019021165,002 ftAug 2025——
42-219374372425,120 ftAug 2025——
42-219032110975,054 ftApr 2025——
42-219300981155,042 ftApr 2025——
42-219017161565,052 ftApr 2025——
42-219001101595,062 ftMar 2025——
42-219016861865,182 ftDec 2024——
42-219018091844,980 ftNov 2024——
42-219017180695,020 ftNov 2024——
42-219017731275,038 ftOct 2024——
42-219001121425,071 ftOct 2024——
42-219103350595,058 ftOct 2024——
42-219003730384,995 ftJul 2024——
42-219016771924,992 ftMay 2024——
42-219017540705,028 ftMay 2024——
42-219003110585,006 ftApr 2024——
42-219017070655,078 ftMar 2024——
42-219003090505,001 ftFeb 2024——
42-21933618224R5,054 ftJan 2024——
42-219328941715,003 ftJan 2024——
42-219374612265,160 ftJan 2024——
42-219017170465,000 ftDec 2023——
42-219022911614,694 ftNov 2023——
42-219017220535,007 ftNov 2023——
42-219001740065,000 ftNov 2023——
42-219026262225,045 ftOct 2023——
42-219017350394,990 ftOct 2023——
42-219017250194,966 ftAug 2023——
42-219003750295,002 ftJul 2023——
42-219016520894,995 ftMar 2023——
42-219018080855,150 ftMar 2023——
42-219003100485,001 ftFeb 2023——
42-219017871005,095 ftFeb 2023——
42-219001111405,066 ftOct 2022——
42-219332870324,990 ftSep 2022——
42-219300742205,096 ftSep 2022——
42-219332910304,991 ftSep 2022——
42-219017210645,083 ftAug 2022——
42-219026242195,068 ftApr 2022——
42-219000371175,034 ftApr 2022——
42-219016891495,030 ftApr 2022——
42-219000390945,038 ftMar 2022——
42-219000400725,031 ftMar 2022——
42-219016821205,054 ftMar 2022——
42-219017370414,995 ftMar 2022——
42-219017420085,080 ftMar 2022——
42-219017661935,080 ftMar 2022——
42-219017691065,002 ftMar 2022——
42-219017911464,985 ftMar 2022——
42-219017921655,002 ftMar 2022——
42-219017940335,005 ftFeb 2022——
42-219016930925,025 ftFeb 2022Apr 2024Yes
42-219016440104,985 ftFeb 2022——
42-219017130455,085 ftFeb 2022——
42-219026252165,038 ftFeb 2022——
42-219016921365,001 ftFeb 2022——
42-219017230545,074 ftJan 2022——
42-219017141765,071 ftSep 2021——
42-219017310165,004 ftSep 2021——
42-219017791035,056 ftSep 2021Aug 2025Yes
42-219017150555,075 ftApr 2021——
42-219016871884,993 ftApr 2021——
42-219017240615,119 ftApr 2021——
42-219016901684,975 ftDec 2019Oct 2023Yes
42-2193739279R5,450 ftDec 2019——
42-219017011705,008 ftNov 2019Jun 2023Yes
42-219016750515,013 ftSep 2019——
42-219332860154,975 ftSep 2019——
42-21937479230H4,960 ftJun 2019——
42-219017750815,055 ftMay 2019——
42-219374392445,176 ftMay 2019——
42-21937464229H5,183 ftApr 2019——
42-219017440114,985 ftApr 2019——
42-21937462227H5,071 ftApr 2019——
42-219374632285,578 ftApr 2019——
42-219003140675,011 ftFeb 2019——
42-219374312355,117 ftJan 2019——
42-219374382435,159 ftJan 2019——
42-219374492455,157 ftJan 2019——
42-219374322365,155 ftJan 2019——
42-219374502475,174 ftDec 2018——
42-219017811235,083 ftDec 2018——
42-219374292335,161 ftDec 2018——
42-219374302345,116 ftDec 2018——
42-21937448246D12,518 ftDec 2018——
42-219374362415,119 ftNov 2018——
42-219374332375,145 ftNov 2018——
42-219374592485,117 ftNov 2018——
42-219374352405,172 ftNov 2018——
42-219374282325,146 ftOct 2018——
42-219374342385,145 ftOct 2018——
42-219017771245,062 ftAug 2018——
42-219016431855,000 ftAug 2018——
42-219016951125,002 ftJul 2018——
42-219016400874,985 ftJul 2018——
42-219017200715,031 ftJul 2018——
42-219017670845,002 ftJul 2018——
42-219016881515,103 ftJun 2018——
42-219017320785,096 ftMay 2018——
42-219017611305,008 ftMay 2018——
42-219003070685,019 ftMay 2018——
42-219319330314,993 ftMay 2018——
42-219000441624,997 ftMay 2018——
42-219016940904,974 ftApr 2018——
42-219017950445,006 ftMar 2018——
42-219016830755,056 ftFeb 2018——
42-219319410145,300 ftFeb 2018——
42-219017270214,984 ftFeb 2018——
42-219017062105,079 ftJan 2018——
42-219328930235,022 ftJan 2018——
42-219017340254,980 ftJan 2018——
42-219017290184,980 ftJan 2018——
42-219018041044,995 ftOct 2017——
42-219018050824,995 ftAug 2017——
42-219323822085,044 ftJun 2017Jun 2019Yes
42-219000671605,005 ftJan 2017——
42-219000941825,285 ftNov 2016May 2019Yes
42-219003130494,992 ftSep 2016——
42-219017190565,309 ftAug 2016——
42-219016761095,106 ftJul 2016Dec 2019Yes
42-219017330075,078 ftAug 2015——
42-219026232185,068 ftAug 2015——
42-219017031355,100 ftMay 2015——
42-21930070144R5,004 ftSep 2013——
42-219017110634,995 ftNov 2012——
42-219032061185,041 ftJul 2012——
42-219017960354,940 ftFeb 2012——
42-219017101375,047 ftJun 2011——
42-219017742005,079 ftOct 2010Oct 2019Yes
42-2193656618912,432 ftNov 2009May 2019Yes
42-219330362175,074 ftAug 2008——
42-219032090764,929 ftMay 2008May 2021Yes
42-219032081194,938 ftMay 2008——
42-219018031265,052 ftApr 2008May 2021Yes
42-219016840985,060 ftApr 2008——
42-219017021114,975 ftApr 2008——
42-219018111664,977 ftMar 2008——
42-219026282215,071 ftSep 2007Jun 2023Yes
42-21932646052R5,023 ftAug 2007——
42-219016551324,976 ftAug 2007——
42-219016541084,987 ftAug 2007——
42-219025531724,985 ftJun 2006——
42-219019030955,035 ftJan 2006——
42-219000421805,018 ftJan 2006——
42-21934767163R5,020 ftDec 2005Mar 2024Yes
42-219016991694,990 ftJul 2004——
42-219017280124,985 ftJan 2004——
42-219000381145,035 ftJan 2004——
42-219000681414,891 ftDec 2003——
42-219336770935,040 ftDec 2003——
42-219000691584,905 ftDec 2003——
42-21901749175—May 2003——
42-21901801122—Feb 2003——
42-21901810102—Dec 2001——
42-21901771083—Nov 2001——
42-21901783080—Oct 2001——
42-21901806105—Oct 2001——
42-21901641129—Sep 2001——
42-21901696190—Sep 2001——
42-21931934153—Jul 2001——
42-219017001504,975 ftJun 2001——
42-21901789148—May 2001——
42-21901708047—Apr 2001——
42-219017091395,065 ftFeb 2001——
42-21901790183—Dec 2000——
42-219016570884,963 ftJul 2000——
42-219016511314,991 ftJul 2000——
42-219016561105,629 ftMar 2000——
42-219330352235,108 ftMay 1990——
42-219017360274,975 ftMar 1990——
42-219016971524,944 ftMay 1986Dec 2019Yes
42-219332981734,982 ftNov 1981——
42-219332900134,978 ftOct 1981——

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.

Leases whose centres are nearest (67)

Ranked by the distance between lease centres, within 5 miles. A lease has no coordinate the state files — each centre is the mean of that lease's own wells, so this measures how far apart two centres are and not whether the two leases touch.

LeaseOperatorCentres apart
SLAUGHTER, S. A. "B"OXY USA INC.0.30 mi
HEFNER, R. A.OXY USA INC.0.50 mi
LINCOLN, Z. O.TEXACO E & P INC.0.69 mi
DAVIS, M. H.OCCIDENTAL PERMIAN LTD.0.75 mi
BARRY UNITOXY USA INC.1.00 mi
SLAUGHTER UNIT "1"OXY USA INC.1.05 mi
SUN-DENTONOXY USA INC.1.07 mi
LINCOLN, Z. O. "A"TEXACO E & P INC.1.11 mi
CITIZENS NATIONAL BANKOXY USA INC.1.12 mi
TOWN LOT UNITOXY USA INC.1.20 mi

The 10 nearest are listed. 67 leases in all have a centre within 5 miles of this one.

Operators who reported on those leases

Taken from the same 5-mile set above. This is who filed production, not who holds acreage — the state publishes no acreage register.

Every month this lease reported (121)

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

121 months

May 202674,9000106.413.05$7,970,109
Apr 202671,74343,32998.932.87$7,221,877
Mar 202674,62844,27589.753.15$6,837,304
Feb 202669,72340,99763.503.75$4,581,162
Jan 202674,67745,98159.138.00$4,783,403
Dec 202577,09344,54556.664.41$4,564,683
Nov 202574,08142,54458.593.93$4,507,452
Oct 202574,44943,87459.383.30$4,565,778
Sep 202572,71540,06762.743.08$4,685,422
Aug 202575,82242,34963.933.01$4,974,973
Jul 202576,48736,82066.743.32$5,226,808
Jun 202574,34236,41166.483.13$5,056,176
May 202576,40473,87860.553.23$4,865,060
Apr 202575,01570,92562.363.54$4,929,231
Mar 202579,87172,51767.704.27$5,716,792
Feb 202572,68065,46970.884.34$5,435,749
Jan 202578,80667,20174.324.28$6,144,393
Dec 202480,34967,34968.993.12$5,753,499
Nov 202478,01865,34969.052.20$5,530,809
Oct 202481,19571,44971.372.28$5,957,891
Sep 202476,54568,63269.612.36$5,490,568
Aug 202477,57269,88375.632.06$6,010,983
Jul 202479,67572,77979.932.15$6,524,649
Jun 202477,47969,54778.082.63$6,232,746
May 202479,58771,72178.812.20$6,429,926
Apr 202477,90872,39884.451.66$6,699,453
Mar 202478,34372,10380.301.55$6,402,351
Feb 202472,94867,84576.091.78$5,671,624
Jan 202478,15588,02973.023.30$5,997,168
Dec 202378,64670,04071.262.61$5,787,169
Nov 202375,15166,90977.892.81$6,041,362
Oct 202377,62766,29585.443.09$6,837,122
Sep 202374,76162,74489.042.74$6,828,327
Aug 202373,58460,79780.522.67$6,087,487
Jul 202374,87360,95774.852.64$5,765,280
Jun 202375,45358,42968.962.26$5,335,200
May 202381,011102,14270.622.23$5,948,508
Apr 202378,86557,86878.122.24$6,290,429
Mar 202383,15161,62672.852.39$6,205,031
Feb 202371,21352,87375.112.47$5,479,176
Jan 202378,87157,84476.533.39$6,231,957
Dec 202277,97253,24776.415.73$6,262,897
Nov 202276,27654,42885.005.65$6,790,771
Oct 202278,12742,19487.185.86$7,058,527
Sep 202273,82337,97984.888.16$6,576,145
Aug 202269,72555,79694.529.13$7,099,666
Jul 202270,01549,480101.587.54$7,485,306
Jun 202269,25846,207115.097.98$8,339,506
May 202273,19345,615109.378.43$8,389,792
Apr 202266,50543,350104.226.84$7,227,561
Mar 202269,46142,093108.885.08$7,776,595
Feb 202263,01038,25791.054.86$5,922,945
Jan 202268,65740,82881.844.54$5,804,153
Dec 202165,45136,92371.323.90$4,811,933
Nov 202163,93332,05377.435.24$5,118,189
Oct 202161,12132,10079.795.71$5,060,260
Sep 202157,99727,84769.865.35$4,200,677
Aug 202157,13231,99066.024.22$3,906,871
Jul 202155,83430,24870.783.98$4,072,380
Jun 202155,30928,50969.493.38$3,939,801
May 202153,16324,92463.483.02$3,450,000
Apr 202149,00323,84760.362.76$3,023,601
Mar 202150,21624,85261.302.72$3,145,762
Feb 202142,95434,30557.805.55$2,673,064
Jan 202146,50338,36450.412.81$2,452,029
Dec 202045,40036,66844.642.68$2,124,760
Nov 202042,73232,13538.772.71$1,743,695
Oct 202042,75828,92836.972.48$1,652,459
Sep 202040,82021,60637.091.99$1,557,032
Aug 202039,10318,55239.982.39$1,607,586
Jul 202039,64318,50438.371.83$1,554,874
Jun 202035,15917,01434.901.69$1,255,808
May 202036,64217,18416.921.81$651,167
Apr 202033,58215,91614.751.80$524,053
Mar 202034,51813,21130.341.86$1,071,799
Feb 202031,09715,93549.881.98$1,582,680
Jan 202030,62710,95957.252.09$1,776,352
Dec 201930,29114,12259.012.30$1,820,014
Nov 201928,66439,90555.302.75$1,694,886
Oct 201929,455053.472.42$1,574,959
Sep 201927,913055.052.66$1,536,611
Aug 201927,562119,42153.112.30$1,739,007
Jul 201926,163183,34356.272.46$1,923,227
Jun 201926,22875,28952.782.49$1,571,874
May 201928,01550,82558.482.74$1,777,594
Apr 201926,02925,23162.632.75$1,699,599
Mar 201928,00222,02456.803.06$1,657,953
Feb 201927,47222,35050.852.79$1,459,357
Jan 201928,43614,45946.033.23$1,355,585
Dec 201830,38516,84846.594.19$1,486,153
Nov 201827,00215,03852.934.24$1,492,935
Oct 201831,22415,60661.443.40$1,971,433
Sep 201827,62713,23359.543.11$1,686,040
Aug 201831,81012,53259.403.07$1,927,944
Jul 201831,90213,39965.142.93$2,117,381
Jun 201830,73515,17260.183.08$1,896,315
May 201831,90417,36065.382.90$2,136,241
Apr 201828,87516,53863.842.90$1,891,353
Mar 201828,27012,14161.222.79$1,764,524
Feb 201831,57312,18661.782.77$1,984,288
Jan 201831,47813,87762.874.01$2,034,659
Dec 201731,10612,29457.272.92$1,817,358
Nov 201731,39711,95255.423.12$1,777,292
Oct 201732,51511,61749.292.98$1,637,326
Sep 201731,30811,78647.523.09$1,524,143
Aug 201733,54713,44845.373.00$1,562,431
Jul 201733,96319,56143.873.09$1,550,347
Jun 201733,44017,01342.493.09$1,473,389
May 201732,27027,52545.373.26$1,553,915
Apr 201736,36315,95647.933.21$1,794,123
Mar 201737,28514,81846.772.98$1,788,032
Feb 201730,33812,53450.452.95$1,567,560
Jan 201735,22314,31849.413.42$1,789,319
Dec 201633,93413,22248.763.72$1,703,845
Nov 201633,42613,06842.492.64$1,454,827
Oct 201633,51915,06946.193.09$1,594,810
Sep 201632,58115,29841.553.10$1,401,174
Aug 201632,48415,33741.442.92$1,390,988
Jul 201633,97815,01941.622.92$1,458,085
Jun 201633,91416,01445.352.69$1,581,011
May 201640,94116,86942.521.99$1,774,398

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               74,900 bbl  × $106.41 = $7,970,109
Casinghead gas         0 Mcf  × $  3.05 =         $0

────────────────────────────────────────────────────
Month total                               $7,970,109

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. 8A/O/70442 is the state's own key, not one this site invented.