WELL · 42-135-43408 · DISTRICT 8
Ratliff I Unit #4401LS
Ector County · Spraberry (Trend Area) field · Producing · Horizontal
Ratliff I Unit #4401LS (API 42-135-43408) is a horizontal well in Ector County operated by Cog Operating LLC, completed May 12, 2017 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued June 7, 2016, permitted to 17,500 ft.
It was permitted by Reliance Energy, Inc. and has since transferred to Cog Operating LLC on the wellbore schedule.
Completion filings report 12 formation tops, including Santa Rosa, Yates, Seven Rivers, Queen.
Its lease has reported 493K barrels of oil and 625K mcf of gas since May 2017, last reporting in July 2026. The lease carries 2 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Reliance Energy, Inc.; the EWA schedule now lists a different operator.
Midland, TX · P-5 Y, filed May 4, 2026 · 4,568 permits on file · (432) 853-2355
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Apr 2026 |
| Latest permit | Reliance Energy, Inc.Jun 7, 2016 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 17,500
- total depth, ft
- 1
- permits on file
- Jun 7, 2016
- last permit issued
- May 12, 2017
- completed
- 493K
- cumulative oil, bbl
- 625K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 12, 2017
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: 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 |
|---|---|---|---|---|---|---|
| Ratliff I Unit O-10-49085 | Spraberry (Trend Area) | COG Operating LLC | 2 | 493K | 625K | May 2017 – Jul 2026 |
Oil, barrels lease total
Last 12 months 16,222 · prior 12 18,964(-14%)
Gas, mcf lease total
Last 12 months 15,393 · prior 12 25,662(-40%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1COG Operating LLCJun 2017 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 815875-99 | Drill | Reliance Energy, Inc. | May 23, 2016 | Jun 7, 2016 | Jun 30, 2016 | 17,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-10-49085 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,952 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa RosaSANTA ROSA BASE | 1,352 | 1,600 |
| Yates | 2,000 | 952 |
| Seven Rivers | 3,970 | -1,018 |
| Queen | 4,309 | -1,357 |
| Grayburg | 4,952 | -2,000 |
| Holt | 5,000 | -2,048 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 5,071 | -2,119 |
| Glorieta | 5,580 | -2,628 |
| Tubb | 6,100 | -3,148 |
| Clear ForkCLEARFORK | 7,356 | -4,404 |
| Connell | — | — |
| Ellenburger | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,355 | 16,380 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 325 | 17.5 | 340 S |
| 9.625 | 5,678 | 12.25 | 655 S |
| 5.5 | 16,514 | 8.5 | 1,765 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 | Mar 8, 2018 | Jan 9, 2018 | Yes |
| 00 | Dec 21, 2017 | Aug 25, 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 42-135-43408 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-135-43408 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward) and the University Lands library. 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/13543408, documented in the API reference.