WELL · 42-311-34540 · DISTRICT 1
Martin Mason Unit N #4H
McMullen County · Eagleville (Eagle Ford-1) field · Shut IN · Horizontal
Martin Mason Unit N #4H (API 42-311-34540) is a horizontal well in Mcmullen County operated by Ineos USA Oil & Gas LLC, completed June 29, 2012 and listed as shut in on the RRC schedule.
The RRC has issued one drilling permit, issued May 12, 2011, permitted to 12,000 ft.
It was permitted by Chesapeake Operating, Inc. and has since transferred to Ineos USA Oil & Gas LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Anacacho, Austin Chalk, Ealge Ford.
Its lease has reported 230K barrels of oil and 76.2K mcf of gas since April 2011, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Chesapeake Operating, Inc.; the EWA schedule now lists a different operator.
- Based in
- Denver, CO
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 26, 2026
- Permits on file
- 98
- Phone
- (720) 764-3473
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Ineos USA Oil & Gas LLC |
| Production reports | Ineos USA Oil & Gas LLCthrough Apr 2026 |
| Latest permit | Chesapeake Operating, Inc.May 12, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 1
- permits on file
- May 12, 2011
- last permit issued
- Jun 29, 2012
- completed
- 230K
- cumulative oil, bbl
- 76.2K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Apr 2011 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 29, 2012
- 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 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Martin Mason Unit N O-1-15426 | Eagleville (Eagle Ford-1) | Ineos USA Oil & Gas LLC | 2 | 230K | 76.2K | Apr 2011 – Jul 2026 |
Oil, barrels lease total
Last 12 months 2,169 · prior 12 4,776(-55%)
Gas, mcf lease total
Last 12 months 746 · prior 12 544(+37%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Chesapeake Operating, Inc.Mar 2012 → Oct 2014
- 2Chesapeake Operating, L.L.C.Nov 2014 → Mar 2023
- 3Ineos USA Oil & Gas LLCApr 2023 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 715909-99 | Drill | Chesapeake Operating, Inc. | May 9, 2011 | May 12, 2011 | Mar 25, 2012 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-15426 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 386 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Anacacho | 8,490 | -8,104 |
| Austin Chalk | 8,872 | -8,486 |
| Ealge Ford | 9,126 | -8,740 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,377 | 14,255 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,937 | 12.25 | 1,139 S |
| 5.5 | 14,362 | 8.75 | 1,670 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 | Nov 27, 2012 | Sep 26, 2012 | — |
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 42-311-34540 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-311-34540 → 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/31134540, documented in the API reference.