TEXAS · WELLS · ATASCOSA COUNTY · R. MAY B LEASE · API 42-013-35410 · DISTRICT 01
R. May B #21H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
R. May B #21H (API 42-013-35410) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed July 30, 2017 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued October 28, 2016, permitted to 11,106 ft.
Completion filings report 10 formation tops, including Queen City, Reklaw, Bartosh, Carrizo.
Its lease has reported 5.76M barrels of oil and 7.27M mcf of gas since September 2012, last reporting in July 2026. The lease carries 28 wells, so these are lease totals, not this well alone.
Operator of record
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Sep 26, 2025
- Permits on file
- 3,191
- Phone
- (832) 486-2737
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marathon Oil EF LLC |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Marathon Oil EF LLCOct 28, 2016 |
- 11,106
- total depth, ft
- 1
- permits on file
- Oct 28, 2016
- last permit issued
- Jul 30, 2017
- completed
- 5.76M
- cumulative oil, bbl
- 7.27M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Sep 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 30, 2017
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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 28 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| R. May B O-1-16361 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 28 | 5.76M | 7.27M | Sep 2012 – Jul 2026 |
Oil, barrels lease total
Last 12 months 87,951 · prior 12 137,851(-36%)
Gas, mcf lease total
Last 12 months 81,921 · prior 12 143,197(-43%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCSep 2012 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 819506-99 | Drill | Marathon Oil EF LLC | Oct 18, 2016 | Oct 28, 2016 | Feb 15, 2017 | 17,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 30, 2017 | R. May B O-1-16361 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Producing | 11,106 |
Formation tops
As filed on W-2/G-1. Subsea from 298 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 3,072 | -2,774 |
| Reklaw | 3,365 | -3,067 |
| Bartosh | 3,726 | -3,428 |
| Carrizo | 4,167 | -3,869 |
| WilcoxWILCOX - DISPOSAL | 5,522 | -5,224 |
| NavarroNAVARRO - H2S | 8,606 | -8,308 |
| OlmosOLMOS - DISPOSAL | 9,321 | -9,023 |
| AnacachoANACACHO - H2S | 10,788 | -10,490 |
| Austin ChalkAUSTIN CHALK - H2S, DISPOSAL | 10,999 | -10,701 |
| EscondidoESCONDIDO - H2S, DISPOSAL | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,244 | 15,783 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,430 | 12.25 | 1,632 S |
| 5.5 | 15,893 | 8.75 | 2,638 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 | Jan 23, 2018 | Aug 28, 2017 | 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 42-013-35410 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-35410 → 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/01335410, documented in the API reference.