WELL · 42-255-38368 · DISTRICT 2
Hierholzer Quad SA B #1
Karnes County · Horizontal
Hierholzer Quad SA B #1 (API 42-255-38368) is a permitted horizontal well in Karnes County filed by Marathon Oil EF LLC; no completion report is on file yet.
The RRC has issued one drilling permit, issued February 26, 2026, permitted to 17,500 ft.
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 | none |
| Production reports | none |
| Latest permit | Marathon Oil EF LLCFeb 26, 2026 |
- 17,500
- total depth, ft
- 1
- permits on file
- Feb 26, 2026
- last permit issued
- —
- completed
- —
- cumulative oil, bbl
- —
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- —
- Shut in
- —
- Plugged
- —
Surface location
28.827997, -98.039531
Permit surface location from the RRC GIS record, in Karnes County.
Only the permit record exists for this well so far, here and in the RRC's wellbore query. Completion reports, formation tops, lease production, and the scanned filings appear once the operator files a completion report, typically months after drilling. Petrora refreshes the wellbore file weekly, so a filing from the last few days may reach the RRC before it shows here. How long each source takes →
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 913500-99 | Drill | Marathon Oil EF LLC | Feb 13, 2026 | Feb 26, 2026 | — | 17,500 |
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 42-255-38368 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-38368 → 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.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well has no tops filed, so it cannot anchor a section; its neighbors can.
May-Ryan Abc-Atlas SA42-255-37842
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Sparta | 2,964 | -2,493 |
| Queen City | 3,266 | -2,795 |
| Reklaw | 3,798 | -3,327 |
| Carrizo | 4,446 | -3,975 |
| Wilcox | 4,504 | -4,033 |
| Anacacho | 10,873 | -10,402 |
| Austin Chalk | 11,015 | -10,544 |
| Eagle Ford | 11,193 | -10,722 |
12 TOPS · FIRST 8
May-Ryan Unit C-H.hedtke SA42-255-37814
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Sparta | 2,964 | -2,493 |
| Queen City | 3,266 | -2,795 |
| Reklaw | 3,798 | -3,327 |
| Carrizo | 4,446 | -3,975 |
| Wilcox | 4,504 | -4,033 |
| Anacacho | 10,874 | -10,403 |
| Austin Chalk | 11,023 | -10,552 |
| Eagle Ford | 11,201 | -10,730 |
11 TOPS · FIRST 8
May-Ryan Unit C42-255-37812
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Sparta | 2,964 | -2,493 |
| Queen City | 3,266 | -2,795 |
| Reklaw | 3,798 | -3,327 |
| Carrizo | 4,446 | -3,975 |
| Wilcox | 4,504 | -4,033 |
| Anacacho | 10,890 | -10,419 |
| Austin Chalk | 11,011 | -10,540 |
| Eagle Ford | 11,194 | -10,723 |
12 TOPS · FIRST 8
May-Ryan Unit C42-255-37811
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Sparta | 2,964 | -2,493 |
| Queen City | 3,266 | -2,795 |
| Reklaw | 3,798 | -3,327 |
| Carrizo | 4,446 | -3,975 |
| Wilcox | 4,504 | -4,033 |
| Anacacho | 10,890 | -10,419 |
| Austin Chalk | 11,011 | -10,540 |
| Eagle Ford | 11,194 | -10,723 |
10 TOPS · FIRST 8
May-Ryan Unit C42-255-37810
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Sparta | 2,964 | -2,493 |
| Queen City | 3,266 | -2,795 |
| Reklaw | 3,798 | -3,327 |
| Carrizo | 4,446 | -3,975 |
| Wilcox | 4,504 | -4,033 |
| Anacacho | 10,864 | -10,393 |
| Austin Chalk | 11,013 | -10,542 |
| Eagle Ford | 11,185 | -10,714 |
12 TOPS · FIRST 8
May-Ryan Abc-Atlas SA42-255-37815
0.8 KM · Marathon Oil EF LLC · Section with this well →
| Eagle Ford | — | |
| Queen City | — | |
| Austin Chalk | — | |
| Carrizo | — | |
| Reklaw | — | |
| Sligo | — | |
| Wilcox | — | |
| Yegua | — |
10 TOPS · FIRST 8
Beam Meyer-Balser SA142-255-38050
1.3 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 3,075 | -2,599 |
| Reklaw | 3,773 | -3,297 |
| Carrizo | 4,392 | -3,916 |
| Wilcox | 4,492 | -4,016 |
| Austin Chalk | 10,989 | -10,513 |
| Eagle Ford | 11,193 | -10,717 |
| Yegua | — | |
| Edwards | — |
10 TOPS · FIRST 8
Beam Meyer-Richard Butler B SA342-255-38049
1.3 KM · Marathon Oil EF LLC · Section with this well →
| Queen City | 3,075 | -2,599 |
| Reklaw | 3,773 | -3,297 |
| Carrizo | 4,392 | -3,916 |
| Wilcox | 4,492 | -4,016 |
| Austin Chalk | 10,987 | -10,511 |
| Eagle Ford | 11,190 | -10,714 |
| Yegua | — | |
| Frio | — |
10 TOPS · FIRST 8
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/25538368, documented in the API reference.