WELL · 42-255-36708 · DISTRICT 2
Boris Unit #503H
Karnes County · Eagleville (Eagle Ford-2) field · Producing · Horizontal
Boris Unit #503H (API 42-255-36708) is a horizontal well in Karnes County operated by Marathon Oil EF LLC, completed August 22, 2020 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit (amended once), issued November 22, 2019, permitted to 23,000 ft.
Completion filings report 10 formation tops, including Yegua, Queen City, Reklaw, Carrizo.
Its lease has reported 4.03M barrels of oil and 5.49M mcf of gas since January 2013, last reporting in July 2026. The lease carries 16 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 Mar 2026 |
| Latest permit | Marathon Oil EF LLCNov 22, 2019 |
- 23,000
- total depth, ft
- 2
- permits on file
- Nov 22, 2019
- last permit issued
- Aug 22, 2020
- completed
- 4.03M
- cumulative oil, bbl
- 5.49M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 2013 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 22, 2020
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
Surface location
28.957649, -97.835391
Permit surface location from the RRC GIS record, in Karnes County.
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 16 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Boris Unit O-2-10478 | Eagleville (Eagle Ford-2) | Marathon Oil EF LLC | 16 | 4.03M | 5.49M | Jan 2013 – Jul 2026 |
Oil, barrels lease total
Last 12 months 56,429 · prior 12 77,354(-27%)
Gas, mcf lease total
Last 12 months 67,380 · prior 12 92,609(-27%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil EF LLCApr 2013 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 859274-98 | Drill | Marathon Oil EF LLC | Dec 18, 2019 | Nov 22, 2019 | Dec 24, 2019 | 23,000 |
| 859274-99 | Drill | Marathon Oil EF LLC | Nov 19, 2019 | Nov 22, 2019 | Dec 24, 2019 | 23,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-2-10478 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 309 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| YeguaYEGUA - DISPOSAL | 1,842 | -1,533 |
| Queen City | 4,034 | -3,725 |
| Reklaw | 4,255 | -3,946 |
| Carrizo | 5,085 | -4,776 |
| WilcoxWILCOX - DISPOSAL | 6,128 | -5,819 |
| Austin ChalkAUSTIN CHALK - H2S | 11,646 | -11,337 |
| Eagle FordEAGLE FORD - H2S | 11,949 | -11,640 |
| EdwardsEDWARDS - H2S | — | — |
| FrioFRIO - DISPOSAL | — | — |
| SligoSLIGO - H2S | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 12,253 | 18,481 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,995 | 12.25 | 1,107 S |
| 5.5 | 18,478 | 8.75 | 3,156 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 | Sep 21, 2020 | Sep 11, 2020 | Yes |
| 00 | Jun 26, 2020 | Apr 19, 2020 | Yes |
| 00 | May 6, 2020 | Feb 22, 2020 | 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 42-255-36708 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-255-36708 → 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's tops beside its 5 nearest neighbors, subsea-aligned so they line up regardless of surface terrain.
Boris Unit42-255-36709
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Yegua | 1,842 | -1,533 |
| Queen City | 4,034 | -3,725 |
| Reklaw | 4,255 | -3,946 |
| Carrizo | 5,085 | -4,776 |
| Wilcox | 6,128 | -5,819 |
| Austin Chalk | 11,639 | -11,330 |
| Eagle Ford | 11,691 | -11,382 |
| Frio | — |
10 TOPS · FIRST 8
Boris Unit42-255-36707
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Yegua | 1,842 | -1,533 |
| Queen City | 4,034 | -3,725 |
| Reklaw | 4,255 | -3,946 |
| Carrizo | 5,085 | -4,776 |
| Wilcox | 6,128 | -5,819 |
| Austin Chalk | 11,652 | -11,343 |
| Eagle Ford | 11,703 | -11,394 |
| Frio | — |
10 TOPS · FIRST 8
Boris Unit42-255-36706
0.0 KM · Marathon Oil EF LLC · Section with this well →
| Yegua | 1,842 | -1,533 |
| Queen City | 4,034 | -3,725 |
| Reklaw | 4,235 | -3,926 |
| Carrizo | 5,085 | -4,776 |
| Wilcox | 6,128 | -5,819 |
| Austin Chalk | 11,656 | -11,347 |
| Eagle Ford | 11,953 | -11,644 |
| Frio | — |
10 TOPS · FIRST 8
Lonesome Dove A42-255-36606
0.5 KM · BPX Operating Company · Section with this well →
| Wilcox | 5,040 | -4,726 |
| Midway | 8,637 | -8,323 |
| Navarro | 9,630 | -9,316 |
| Olmos | 10,348 | -10,034 |
| Anacacho | 11,491 | -11,177 |
| Austin Chalk | 11,631 | -11,317 |
| Eagle Ford | 11,845 | -11,531 |
| Edwards | — |
14 TOPS · FIRST 8
Lonesome Dove A42-255-36605
0.5 KM · BPX Operating Company · Section with this well →
| Wilcox | 4,977 | -4,663 |
| Midway | 8,658 | -8,344 |
| Navarro | 9,642 | -9,328 |
| Olmos | 10,365 | -10,051 |
| Anacacho | 11,503 | -11,189 |
| Austin Chalk | 11,644 | -11,330 |
| Eagle Ford | 11,861 | -11,547 |
| Yegua | — |
14 TOPS · FIRST 8
Lonesome Dove A42-255-36604
0.5 KM · BPX Operating Company · Section with this well →
| Wilcox | 4,977 | -4,663 |
| Midway | 8,676 | -8,362 |
| Navarro | 9,661 | -9,347 |
| Olmos | 10,389 | -10,075 |
| Anacacho | 11,514 | -11,200 |
| Austin Chalk | 11,653 | -11,339 |
| Eagle Ford | 11,869 | -11,555 |
| Carrizo | — |
14 TOPS · FIRST 8
Lonesome Dove A42-255-36608
0.5 KM · BPX Operating Company · Section with this well →
| Wilcox | 4,973 | -4,659 |
| Midway | 8,633 | -8,319 |
| Navarro | 9,625 | -9,311 |
| Olmos | 10,366 | -10,052 |
| Anacacho | 11,481 | -11,167 |
| Austin Chalk | 11,617 | -11,303 |
| Eagle Ford | 11,838 | -11,524 |
| Sligo | — |
14 TOPS · FIRST 8
Lonesome Dove A42-255-36792
0.5 KM · BPX Operating Company · Section with this well →
| Wilcox | 4,981 | -4,667 |
| Austin Chalk | 11,614 | -11,300 |
| Eagle Ford | 11,827 | -11,513 |
| Frio | — | |
| Queen City | — | |
| Reklaw | — | |
| Sligo | — | |
| Yegua | — |
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/25536708, documented in the API reference.