TEXAS · WELLS · JOHNSON COUNTY · MAYFIELD LEASE · API 42-251-30795 · DISTRICT 7C
Mayfield #1
Johnson County · Newark East (Barnett Shale) field · Producing · Horizontal
Mayfield #1 (API 42-251-30795) is a horizontal well in Johnson County operated by Formentera Operations LLC, completed October 29, 2007 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued February 14, 2006, permitted to 7,267 ft.
It was permitted by Devon Energy Production CO, L.P. and has since transferred to Formentera Operations LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Big Saline, Marble Falls, Barnett.
Its lease has reported 50 barrels of oil and 3.81M mcf of gas since October 2007, last reporting volume in August 2026.
Operator of record
Permitted by Devon Energy Production Co, L.P.; the EWA schedule now lists a different operator.
- Based in
- Austin, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jun 11, 2026
- Permits on file
- 94
- Phone
- (512) 514-5779
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Formentera Operations LLC |
| Production reports | Formentera Operations LLCthrough Aug 2026 |
| Latest permit | Devon Energy Production Co, L.P.Feb 14, 2006 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,267
- total depth, ft
- 1
- permits on file
- Feb 14, 2006
- last permit issued
- Oct 29, 2007
- completed
- 50
- cumulative oil, bbl
- 3.81M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · OCT 2007 THROUGH AUG 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Oct 29, 2007
- 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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH AUG 2026
Texas reports oil by lease, not by well. These are the lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Mayfield G-13-235104 | Newark, East (Barnett Shale) | Formentera Operations LLC | 1 | 50 | 3.81M | Oct 2007 – Aug 2026 |
Gas, mcf lease total
Last 12 months 84,834 · prior 12 90,737(-7%)
Wells named Mayfield
Formentera Operations LLC's other wells filed under this lease name in Johnson County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Operator on the lease's P-4
Each operator named on the P-4 filings for this well's lease (a gas well is its own lease), from the date its filing took effect. The P-4 is filed by lease, so a date before the well was drilled is the lease's.
| Operator | From | To |
|---|---|---|
| Formentera Operations LLC | Dec 1, 2025 | today |
| Javelin Energy Partners Mgmt LLC | Apr 5, 2022 | Dec 1, 2025 |
| Venado Operating Company LLC | Jan 1, 2022 | Apr 5, 2022 |
| FDL Operating, LLC | Jun 1, 2018 | Jan 1, 2022 |
| Devon Energy Production Co, L.P. | Oct 29, 2007 | Jun 1, 2018 |
Reporting production
Every operator that reported production on this well's lease, in order.
- 1Devon Energy Production Co, L.P.Oct 2007 → Apr 2018
- 2FDL Operating, LLCMay 2018 → Dec 2021
- 3Venado Operating Company LLCJan 2022 → Mar 2022
- 4Javelin Energy Partners Mgmt LLCApr 2022 → Nov 2025
- 5Formentera Operations LLCDec 2025 → Aug 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 614153-99 | Drill | Devon Energy Production Co, L.P. | Feb 14, 2006 | Feb 14, 2006 | Aug 17, 2006 | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Oct 29, 2007 | Mayfield G-13-235104 | Newark East (Barnett Shale) | Formentera Operations LLC | Producing | 7,267 |
Formation tops
As filed on W-2/G-1. Subsea from 741 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Big Saline | 6,600 | -5,859 |
| Big Saline | 6,605 | -5,864 |
| Marble FallsLOWER MARBLE FALLS | 6,919 | -6,178 |
| Marble FallsLOWER MARBLE FALLS | 6,949 | -6,208 |
| BarnettUPPER BARNETT SHALE | 7,131 | -6,390 |
| BarnettUPPER BARNETT SHALE | 7,254 | -6,513 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,495 | 7,857 | Perforated |
| 7,915 | 8,277 | Perforated |
| 8,335 | 8,697 | Perforated |
| 8,755 | 9,117 | Perforated |
| 9,175 | 9,537 | Perforated |
| 9,595 | 9,957 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 1,450 | 12.25 | 625 S |
| 5.5 | 10,038 | 8.5 | 1,890 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. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Jan 31, 2009 | Dec 3, 2008 | — |
| 00 | May 30, 2008 | Dec 10, 2007 | Yes |
| 00 | May 22, 2008 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Sep 30, 2009. Resistivity.
Click a log to get its files from the RRC (free account). It opens in a new tab on the RRC's log search for this well, which lists each file to view or download; the RRC has no address for a single file.
| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| RESISTIVITY | TIFF | 1,447 to 6,315 | Sep 30, 2009run Aug 24, 2006 | 21.5 |
These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
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 42-251-30795 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-251-30795 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
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/25130795, documented in the API reference.