TEXAS · WELLS · ZAVALA COUNTY · MARK & SANDRA UNIT LEASE · API 42-507-32943 · DISTRICT 01
Mark & Sandra Unit #3H
Zavala County · Briscoe Ranch (Eagleford) field · Producing · Horizontal
Mark & Sandra Unit #3H (API 42-507-32943) is a horizontal well in Zavala County operated by Atlas Operating LLC, completed December 1, 2012 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued October 17, 2012, permitted to 5,843 ft.
It was permitted by Sanchez Oil & Gas Corporation and has since transferred to Atlas Operating LLC on the wellbore schedule.
Completion filings report 4 formation tops, including San Miguel, Anacacho, Austin Chalk, Eagle Ford.
Its lease has reported 272K barrels of oil and 64K mcf of gas since June 2012, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Sanchez Oil & Gas Corporation; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Hearing (H)
- P-5 last filed
- Mar 9, 2026
- Permits on file
- 78
- Phone
- (281) 893-9400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Atlas Operating LLC |
| Production reports | Atlas Operating LLCthrough Mar 2026 |
| Latest permit | Sanchez Oil & Gas CorporationOct 17, 2012 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 5,843
- total depth, ft
- 1
- permits on file
- Oct 17, 2012
- last permit issued
- Dec 1, 2012
- completed
- 272K
- cumulative oil, bbl
- 64K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jun 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 1, 2012
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mark & Sandra Unit O-1-16060 | Briscoe Ranch (Eagleford) | Atlas Operating LLC | 2 | 272K | 64K | Jun 2012 – Jul 2026 |
Oil, barrels lease total
Last 12 months 4,181 · prior 12 6,905(-39%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Sanchez Oil & Gas CorporationJun 2012 → Dec 2020
- 2SN Operating, LLCMay 2014 → Oct 2016
- 3Catarina Midstream, LLCJan 2021 → Mar 2021
- 4Atlas Operating LLCApr 2021 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 749625-99 | Drill | Sanchez Oil & Gas Corporation | Oct 9, 2012 | Oct 17, 2012 | Oct 24, 2012 | 8,400 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 1, 2012 | Mark & Sandra Unit O-1-16060 | Briscoe Ranch (Eagleford) | Atlas Operating LLC | Producing | 5,843 |
Formation tops
As filed on W-2/G-1. Subsea from 608 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| San Miguel | 3,301 | -2,693 |
| Anacacho | 4,242 | -3,634 |
| Austin Chalk | 4,542 | -3,934 |
| Austin ChalkBASE AUSTIN CHALK | 5,470 | -4,862 |
| Eagle FordLOWER EAGLE FORD | 5,850 | -5,242 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,983 | 10,306 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,018 | 12.25 | 1,045 S |
| 5.5 | 10,565 | 8.75 | 625 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 | Mar 22, 2013 | Jan 17, 2013 | 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 42-507-32943 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-507-32943 → 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/50732943, documented in the API reference.