WELL · 42-383-36859 · DISTRICT 7
Rocker B -C- #21
Reagan County · Spraberry (Trend Area) field · Vertical
Rocker B -C- #21 (API 42-383-36859) is a well in Reagan County operated by Discovery Natural Resources LLC, completed December 7, 2010.
The RRC has issued one drilling permit (amended once), issued June 25, 2010, permitted to 10,000 ft.
It was permitted by Pioneer Natural Res. USA, Inc. and has since transferred to Discovery Natural Resources LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Spraberry, Dean, Wolfcamp.
Its 2 leases have reported 3.58M barrels of oil and 31.9M mcf of gas since January 1993, last reporting in July 2026. The leases carry 95 wells, so these are lease totals, not this well alone.
Operator of record
Discovery Natural Resources LLC
Permitted by Pioneer Natural Res. USA, Inc.; the EWA schedule now lists a different operator.
- Based in
- Denver, CO
- P-5 status
- Active (A)
- P-5 last filed
- Jan 12, 2026
- Permits on file
- 451
- Phone
- (303) 893-5073
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Discovery Natural Resources LLC |
| Production reports | Discovery Natural Resources LLCthrough Apr 2026 |
| Latest permit | Pioneer Natural Res. USA, Inc.Jun 25, 2010 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,000
- total depth, ft
- 2
- permits on file
- Jun 25, 2010
- last permit issued
- Dec 7, 2010
- completed
- 3.58M
- cumulative oil, bbl
- 31.9M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Dec 7, 2010
- Shut in
- —
- Plugged
- —
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 95 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mustang Draw O-9-16520 | Spraberry (Trend Area) | Discovery Natural Resources LLC | 84 | 3.47M | 31.3M | Feb 2008 – Jul 2026 |
| Rocker B -C- O-9-6270 | Spraberry (Trend Area) | Discovery Natural Resources LLC | 11 | 111K | 570K | Jan 1993 – Apr 2015 |
Gas, mcf lease total
Last 12 months 1,784,199 · prior 12 1,998,098(-11%)
Oil, barrels lease total
Last 12 months 88,214 · prior 12 105,480(-16%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Amax Oil & Gas Inc.Jan 1993 → Apr 1993
- 2Consolidated Oil & Gas, IncMay 1993 → Aug 1995
- 3Hugoton Energy CorporationSep 1995 → Mar 1998
- 4Chesapeake Operating, Inc.Apr 1998 → Sep 1999
- 5Nadel and Gussman Permian,l.l.c.Oct 1999 → Oct 2004
- 6Gruy Petroleum Management Co.Nov 2004 → Apr 2006
- 7Cimarex Energy Co. of ColoradoMay 2006 → Dec 2007
- 8Pioneer Natural Res. USA, Inc.Jan 2008 → Nov 2014
- 9Trilogy Operating, Inc.Mar 2008 → Apr 2010
- 10Fiml Natural Resources, LLCMay 2010 → Aug 2014
- 11Discovery Natural Resources LLCSep 2014 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 697950-98 | Drill | Pioneer Natural Res. USA, Inc. | Jul 29, 2010 | Jun 25, 2010 | Sep 29, 2010 | 10,000 |
| 697950-99 | Drill | Pioneer Natural Res. USA, Inc. | Jun 22, 2010 | Jun 25, 2010 | Sep 29, 2010 | 10,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-9-6270 | — | — | — | — |
| — | — O-9-16520 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,390 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,073 | 5,919 | Perforated |
| 6,501 | 6,717 | Perforated |
| 6,852 | 8,966 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 641 | 11 | 400 S |
| 4.5 | 9,300 | 7.875 | 1,300 S |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Apr 2, 2015 | Jan 31, 2011 | Yes |
| 00 | Jul 26, 2011 | Jan 31, 2011 | Yes |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-383-36859 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-383-36859 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. then paste it into their search.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/38336859, documented in the API reference.