TEXAS · WELLS · GLASSCOCK COUNTY · BLALOCK A LEASE · API 42-173-33538 · DISTRICT 7B
Blalock A #4811
Glasscock County · Spraberry (Trend Area) field · Vertical
Blalock A #4811 (API 42-173-33538) is a plugged well in Glasscock County, plugged November 1, 2021, last operated by Xto Energy Inc..
The RRC has issued one drilling permit, issued August 3, 2009, permitted to 11,000 ft.
It was permitted by Piedra Operating, LLC and has since transferred to Xto Energy Inc. on the wellbore schedule.
Completion filings report 6 formation tops, including Yates, Grayburg, San Andres, Spraberry.
Its lease has reported 102K barrels of oil and 480K mcf of gas since October 2009, last reporting in July 2026. The lease carries 4 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Piedra Operating, LLC; the EWA schedule now lists a different operator.
- Based in
- Spring, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Apr 8, 2026
- Permits on file
- 16,156
- Phone
- (346) 502-1572
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | XTO Energy Inc. |
| Production reports | XTO Energy Inc.through Apr 2026 |
| Latest permit | Piedra Operating, LLCAug 3, 2009 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,000
- total depth, ft
- 1
- permits on file
- Aug 3, 2009
- last permit issued
- Jun 11, 2016
- completed
- 102K
- cumulative oil, bbl
- 480K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2009 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 11, 2016
- Shut in
- —
- Plugged
- Nov 1, 2021
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 lease this well is completed on; they carry 4 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Blalock A O-10-39750 | Spraberry (Trend Area) | XTO Energy Inc. | 4 | 102K | 480K | Oct 2009 – Jul 2026 |
Gas, mcf lease total
Last 12 months 3,554 · prior 12 4,966(-28%)
Oil, barrels lease total
Last 12 months 1,199 · prior 12 859(+40%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Piedra Operating, LLCOct 2009 → Feb 2011
- 2Berry Oil Comp.Mar 2011 → Jun 2014
- 3Linn Operating, Inc.Jul 2014 → Oct 2014
- 4XTO Energy Inc.Nov 2014 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 683455-99 | Drill | Piedra Operating, LLC | Jul 24, 2009 | Aug 3, 2009 | Sep 5, 2009 | 11,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jun 11, 2016 | Blalock A O-10-39750 | Spraberry (Trend Area) | XTO Energy Inc. | Plugged | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,566 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,004 | 10,152 | Perforated |
| 7,864 | 10,152 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 324 | 17.5 | 355 S |
| 8.625 | 3,530 | 12.25 | 1,200 S |
| 5.5 | 10,260 | 7.875 | 1,400 S |
| 5.5 | 10,260 | 8 | 1,400 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 | Jul 1, 2016 | Jun 29, 2016 | — |
| 00 | Jan 27, 2014 | Jun 14, 2013 | — |
| 00 | Jun 21, 2013 | Jul 11, 2012 | — |
| 00 | Mar 30, 2010 | Nov 4, 2009 | Yes |
| 00 | Mar 9, 2010 | — | — |
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 42-173-33538 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-173-33538 → 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/17333538, documented in the API reference.