WELL · 42-255-31977 · DISTRICT 2
Margaret Unit 1 #1H
Karnes County · Eagleville (Eagle Ford-2) field · Horizontal
Margaret Unit 1 #1H (API 42-255-31977) is a horizontal well in Karnes County operated by Silver Hill Energy Operating LLC, completed July 20, 2011.
The RRC has issued one drilling permit (amended once), issued May 23, 2011, permitted to 12,000 ft.
It was permitted by Riley Exploration, LLC and has since transferred to Silver Hill Energy Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Eagle Ford.
Its 2 leases have reported 356K barrels of oil and 651K mcf of gas since April 2011, last reporting in July 2026. The leases carry 3 wells, so these are lease totals, not this well alone.
Operator of record
Silver Hill Energy Operating LLC
Permitted by Riley Exploration, LLC; the EWA schedule now lists a different operator.
Dallas, TX · P-5 Y, filed Jan 5, 2026 · 215 permits on file · (214) 613-3744
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Silver Hill Energy Operating LLC |
| Production reports | Silver Hill Energy Operating LLCthrough Apr 2026 |
| Latest permit | Riley Exploration, LLCMay 23, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 2
- permits on file
- May 23, 2011
- last permit issued
- Jul 20, 2011
- completed
- 356K
- cumulative oil, bbl
- 651K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jul 20, 2011
- 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 3 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Margaret Unit 1 O-2-9663 | Eagleville (Eagle Ford-2) | Silver Hill Energy Operating LLC | 2 | 356K | 651K | Apr 2011 – Jul 2026 |
| Margaret Unit 2 O-2-13214 | Eagleville (Eagle Ford-2) | Silver Hill Energy Operating LLC | 1 | 0 | 0 | May 2024 – Jul 2026 |
Oil, barrels lease total
Last 12 months 4,591 · prior 12 5,868(-22%)
Gas, mcf lease total
Last 12 months 0 · prior 12 242(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Riley Exploration, LLCMay 2011 → Jun 2013
- 21776 Energy Operators, LLCJul 2013 → Oct 2025
- 3Silver Hill Energy Operating LLCNov 2025 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 716872-97 | Drill | Riley Exploration, LLC | Nov 6, 2012 | May 23, 2011 | May 23, 2011 | 12,000 |
| 716872-99 | Drill | Riley Exploration, LLC | May 19, 2011 | May 23, 2011 | May 23, 2011 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-2-9663 | — | — | — | — |
| — | — O-2-13214 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 335 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 10,500 | -10,165 |
| Austin Chalk | 10,649 | -10,314 |
| Eagle FordUPPER EAGLE FORD | 10,910 | -10,575 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,372 | 15,576 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,074 | 12.25 | 1,870 S |
| 5.5 | 15,666 | 8.5 | 2,250 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 | Jun 15, 2026 | Sep 28, 2011 | Yes |
| 00 | Feb 16, 2012 | Sep 28, 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 42-255-31977 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-31977 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). 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/25531977, documented in the API reference.