BLOCK 31 UNIT

Operated by HILCORP ENERGY COMPANY (P-5 386310) in the BLOCK 31 (GRAYBURG) field. Every figure below is a volume the Railroad Commission published, multiplied by a monthly price you can check.

Oil lease lease 9684District 08Field 09358630Hydrogen sulphide fieldOilCasinghead gasSaveExport
Value, all time
$1.7 M
Jan 1993 – May 2026
Value, last 12 filed months
$0
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 3 leases and 34 wells, and the rule below applies to all of them.

Discovered
1956-06-24
as the register files it
Field class
Oil
the register's own label
Between wells
1,320 ft
minimum
From a lease line
660 ft
minimum

A drilling unit in this field needs at least 80 acres.

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.

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
OilDisposition93,928 bbl$1,651,917
Casinghead gasProduction8,306 Mcf$19,936
Total$1,671,853

4,725 Mcf of this lease's gas, across 32 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 (32)

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 31.4662, -102.4474. A lease has no coordinate of its own — that point is the mean of its wells, and they span 1.9 miles. 2 wells have no surveyed location and are left out of it.

31.47032, -102.44109 · centre of 30 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
90.6%
29 of 32 wells
With a plug date
81.3%
26 of 32 wells
Median depth
3,265 ft
31 wells filed one
Completion to plug
16.6 years
median over 19 wells

What the state filed about each well

On the RRC proration schedule
2990.6%
A plug date is filed
2681.3%
BothOn the schedule and plugged. Neither fact cancels the other.
2681.3%
NeitherNo plug date, and not on the schedule.
39.4%

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, 31 of 32 wells. Median 3,265 ft, with the middle half between 3,228 and 3,300 ft; the shallowest is 3,165 ft and the deepest 9,050 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, 23 of 32 wells, Jan 1962 – Feb 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
Jan 1962 – Feb 2025
23 of 32 wells; 9 filed none
Plug dates filed
Aug 1984 – Dec 2023
26 of 32 wells; 6 filed none

Last completion to plug: a median of 16.6 years across the 19 wells that filed both dates, with the middle half between 13.6 years and 25.8 years. The gap is the distance between two filed dates. It is not a statement of how long the well produced.

32 wells

42-10303009F 3F3,260 ftJun 1991Yes
42-10303015Y 23,200 ftJun 1991Yes
42-10303025P 33,250 ftAug 1995Yes
42-10303026P 43,165 ftNov 1992Yes
42-10303027P 53,173 ftDec 1992Yes
42-10303059H 43,197 ftDec 1991Yes
42-10310063A 5A3,220 ftJan 1997Yes
42-10381433H 2GYes
42-103814341015D8,200 ftYes
42-10303053K 34,006 ftFeb 2025
42-10310645101D8,200 ftApr 2024
42-10310834301D7,966 ftAug 2018Dec 2023Yes
42-10336541P 193,675 ftJun 2016
42-10303010F 4F3,252 ftJun 1997Yes
42-10303013Y 33,225 ftMar 1985Jul 2001Yes
42-10331790P 123,270 ftOct 1983Mar 1993Yes
42-10332851C 73,265 ftMar 1982Jun 1991Yes
42-10331796A 12A3,300 ftMar 1978Oct 1994Yes
42-10331789P 113,300 ftJan 1978Oct 2015Yes
42-10331763C 63,300 ftOct 1977Oct 1990Yes
42-10331764O 93,300 ftSep 1977Jun 1991Yes
42-10331521Y 73,300 ftJul 1977Dec 1992Yes
42-10331520A 9A3,300 ftJul 1977May 1995Yes
42-10331109A 6A9,050 ftMar 1977Jul 1990Yes
42-10331435O 73,300 ftJan 1977Jun 1991Yes
42-10331364P 93,250 ftOct 1976Jan 2001Yes
42-10331288Y 63,450 ftJun 1976Dec 1994Yes
42-10310253K 2K3,230 ftMar 1963Jan 2001Yes
42-10310098P 63,195 ftJan 1963Apr 1990Yes
42-10303022O 33,214 ftNov 1962Aug 1984Yes
42-10303003H 2H3,240 ftApr 1962Oct 1994Yes
42-10303006G 3G3,246 ftJan 1962Aug 1990Yes

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 202600106.413.05$0
Apr 20260098.932.87$0
Mar 20260089.753.15$0
Feb 20260063.503.75$0
Jan 20260059.138.00$0
Dec 20250056.664.41$0
Nov 20250058.593.93$0
Oct 20250059.383.30$0
Sep 20250062.743.08$0
Aug 20250063.933.01$0
Jul 20250066.743.32$0
Jun 20250066.483.13$0
May 20250060.553.23$0
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 20240071.372.28$0
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 20240084.451.66$0
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 20230089.042.74$0
Aug 20230080.522.67$0
Jul 20230074.852.64$0
Jun 20230068.962.26$0
May 20230070.622.23$0
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 20220084.888.16$0
Aug 20220094.529.13$0
Jul 202200101.587.54$0
Jun 202200115.097.98$0
May 202200109.378.43$0
Apr 202200104.226.84$0
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 20210079.795.71$0
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 20161041.442.92$41
Jul 2016357841.622.92$1,685
Jun 201625438745.352.69$12,558
May 2016751242.521.99$3,213
Apr 20161193236.561.99$4,414
Mar 20161293033.011.79$4,312
Feb 20161966526.472.06$5,322
Jan 20163179027.352.36$8,883
Dec 20153252732.362.00$10,571
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 20140090.404.86$0
Dec 20130091.824.35$0
Nov 20130088.853.74$0
Oct 20130097.423.78$0
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 20102080.843.80$162
Oct 20100078.103.51$0
Sep 20100072.633.98$0
Aug 20100073.684.42$0
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 20105074.365.96$372
Dec 200939071.445.48$2,786
Nov 200951074.593.75$3,804
Oct 200948072.544.11$3,482
Sep 200951065.543.06$3,343
Aug 200946067.423.22$3,101
Jul 200919061.133.46$1,161
Jun 20092066.163.90$132
May 20090054.743.93$0
Apr 20090046.773.59$0
Mar 20090042.144.06$0
Feb 20090032.814.63$0
Jan 20090035.865.37$0
Dec 20080037.105.98$0
Nov 20080055.496.86$0
Oct 20080075.246.92$0
Sep 200800101.767.88$0
Aug 200800114.228.48$0
Jul 200800131.0811.39$0
Jun 200800131.3313.03$0
May 200800123.1711.57$0
Apr 200800110.3110.45$0
Mar 200800101.909.66$0
Feb 20080092.538.77$0
Jan 20080090.388.21$0
Dec 20070088.337.30$0
Nov 20070091.677.29$0
Oct 20070082.856.92$0
Sep 20070075.846.24$0
Aug 20070069.066.39$0
Jul 20070070.906.39$0
Jun 20070062.007.55$0
May 20070058.747.85$0
Apr 20070059.617.81$0
Mar 20070056.927.30$0
Feb 20070055.108.22$0
Jan 20070050.306.73$0
Dec 20060056.656.92$0
Nov 20060054.207.62$0
Oct 20060054.906.01$0
Sep 20060060.085.04$0
Aug 20060068.717.34$0
Jul 20062069.376.34$139
Jun 200622066.286.38$1,458
May 200659066.016.42$3,895
Apr 200644064.397.36$2,833
Mar 20064310756.707.08$3,196
Feb 2006436957.597.75$3,011
Jan 2006478660.598.93$3,616
Dec 2005457854.9413.42$3,519
Nov 2005121954.6910.59$857
Oct 2005687558.3413.80$5,002
Sep 2005318361.4512.08$2,908
Aug 2005328361.519.80$2,781
Jul 20050055.697.84$0
Jun 20050052.337.38$0
May 20051045.226.65$45
Apr 2005277949.207.36$1,910
Mar 2005288350.377.15$2,004
Feb 2005256745.226.31$1,553
Jan 2005269043.166.32$1,691
Dec 20042719139.866.75$2,366
Nov 2004119445.286.33$1,093
Oct 20042822749.706.52$2,871
Sep 20042318043.245.28$1,946
Aug 20042819242.375.55$2,252
Jul 20042817138.286.08$2,112
Jun 2004273836.106.43$1,219
May 2004251137.486.49$1,008
Apr 2004241134.475.86$892
Mar 20042551234.365.53$8,828
Feb 20045371132.455.51$17,486
Jan 20043131132.036.30$10,095
Dec 2003210730.266.30$6,399
Nov 2003195428.804.60$5,634
Oct 20032921128.174.76$8,278
Sep 20032511126.314.75$6,656
Aug 20032801129.765.13$8,389
Jul 20032581029.415.17$7,639
Jun 20032342828.565.98$6,851
May 20032553026.595.97$6,960
Apr 20032282326.675.41$6,205
Mar 20032672431.146.10$8,461
Feb 2003862333.487.93$3,062
Jan 200313030.315.58$394
Dec 20021592126.914.85$4,381
Nov 20020024.664.14$0
Oct 200240026.464.23$1,058
Sep 20023092627.443.64$8,573
Aug 20023533225.963.16$9,265
Jul 20022272124.583.06$5,644
Jun 20022392923.733.34$5,768
May 20022642524.663.58$6,600
Apr 20022853923.653.51$6,877
Mar 20022464722.003.10$5,558
Feb 20023163118.222.38$5,831
Jan 20023374617.172.38$5,896
Dec 20011914016.932.36$3,328
Nov 20011734018.072.41$3,222
Oct 2001711919.782.53$1,452
Sep 20010024.262.25$0
Aug 20010024.873.05$0
Jul 20010023.933.20$0
Jun 20010024.563.82$0
May 20010025.524.31$0
Apr 20010024.685.34$0
Mar 20010024.545.38$0
Feb 20010027.755.77$0
Jan 20010027.478.40$0
Dec 20000026.889.12$0
Nov 20000032.215.66$0
Oct 20002031.235.15$62
Sep 200027131.875.19$866
Aug 200080229.644.54$2,380
Jul 200072128.534.09$2,058
Jun 200072329.304.40$2,123
May 200068227.263.68$1,861
Apr 200064324.513.12$1,578
Mar 200048428.422.86$1,376
Feb 200024127.622.73$666
Jan 200071425.272.48$1,804
Dec 199976524.282.42$1,857
Nov 199976523.192.43$1,775
Oct 199981520.982.80$1,713
Sep 199975421.752.62$1,642
Aug 199977419.262.88$1,495
Jul 1999118417.892.37$2,121
Jun 1999141215.942.36$2,252
May 1999152415.792.32$2,409
Apr 1999154515.102.21$2,336
Mar 1999157412.471.84$1,965
Feb 199914449.981.82$1,444
Jan 1999157610.381.90$1,641
Dec 199814799.201.77$1,368
Nov 1998110610.892.19$1,211
Oct 1998106412.421.97$1,324
Sep 1998105312.592.08$1,328
Aug 1998110411.301.91$1,251
Jul 1998101411.742.24$1,195
Jun 1998109511.242.24$1,236
May 199891512.622.21$1,159
Apr 199888513.042.51$1,160
Mar 1998102512.802.31$1,317
Feb 199896513.952.30$1,351
Jan 1998111614.702.15$1,645
Dec 1997122516.322.41$2,003
Nov 199797418.193.09$1,777
Oct 199793419.253.15$1,803
Sep 199794517.742.95$1,682
Aug 199799517.862.55$1,781
Jul 1997101417.582.25$1,785
Jun 1997116617.242.26$2,013
May 1997124318.972.31$2,359
Apr 1997127717.882.08$2,285
Mar 1997100718.951.94$1,909
Feb 199773520.492.21$1,507
Jan 199796523.483.54$2,272
Dec 1996127723.32$2,962
Nov 19961991021.97$4,372
Oct 1996247923.31$5,758
Sep 19964752322.22$10,555
Aug 1996225020.26$4,559
Jul 1996453019.55$8,856
Jun 1996402018.73$7,529
May 1996436019.43$8,471
Apr 1996399021.51$8,582
Mar 1996537419.38$10,407
Feb 1996511016.98$8,677
Jan 1996599017.07$10,225
Dec 1995567017.19$9,747
Nov 1995695016.00$11,120
Oct 1995632015.43$9,752
Sep 1995794016.18$12,847
Aug 1995955015.92$15,204
Jul 19951,304015.24$19,873
Jun 1995955016.41$15,672
May 19951,460017.56$25,638
Apr 19952,00516317.73$35,549
Mar 19951,51238916.44$24,857
Feb 19951,56035116.58$25,865
Jan 19951,50338915.92$23,928
Dec 19941,57637615.03$23,687
Nov 19941,669015.90$26,537
Oct 19941,96324715.58$30,584
Sep 19941,990115.29$30,427
Aug 19942,151116.13$34,696
Jul 19942,087117.56$36,648
Jun 19941,261117.09$21,550
May 19942,027115.88$32,189
Apr 19941,892114.14$26,753
Mar 19942,300112.46$28,658
Feb 19942,244112.50$28,050
Jan 19943,22838912.66$40,866
Dec 19932,80338912.33$34,561
Nov 19932,9485914.49$42,717
Oct 19933,1421215.85$49,801
Sep 19933,067115.03$46,097
Aug 19933,081115.66$48,248
Jul 19933,048115.46$47,122
Jun 19933,169316.79$53,208
May 19933,31238917.68$58,556
Apr 19933,22837618.05$58,265
Mar 19933,16538918.14$57,413
Feb 19932,93335117.90$52,501
Jan 19933,26438916.93$55,260

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.

Aug 2016 — as filed, then multipliedworked
Oil                    1 bbl  × $ 41.44 =        $41
Casinghead gas         0 Mcf  × $  2.92 =         $0

────────────────────────────────────────────────────
Month total                                      $41

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. 08/O/9684 is the state's own key, not one this site invented.