WELL · 42-461-39519 · DISTRICT 7
Sylvia #8310
Upton County · Spraberry (Trend Area) field · Producing · Vertical
Sylvia #8310 (API 42-461-39519) is a well in Upton County operated by Cog Operating LLC, completed January 20, 2015 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 11, 2014, permitted to 10,910 ft.
It was permitted by Summit Petroleum LLC and has since transferred to Cog Operating LLC on the wellbore schedule.
Completion filings report 10 formation tops, including Yates, Grayburg, San Andres, Clear Fork.
Its lease has reported 164K barrels of oil and 830K mcf of gas since October 2012, last reporting in July 2026. The lease carries 5 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Summit Petroleum LLC; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jun 2, 2026
- Permits on file
- 4,568
- Phone
- (432) 683-7443
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Apr 2026 |
| Latest permit | Summit Petroleum LLCAug 11, 2014 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,910
- total depth, ft
- 1
- permits on file
- Aug 11, 2014
- last permit issued
- Jan 20, 2015
- completed
- 164K
- cumulative oil, bbl
- 830K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Oct 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jan 20, 2015
- 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.
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 5 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Sylvia O-9-18037 | Spraberry (Trend Area) | COG Operating LLC | 5 | 164K | 830K | Oct 2012 – Jul 2026 |
Gas, mcf lease total
Last 12 months 31,759 · prior 12 41,281(-23%)
Oil, barrels lease total
Last 12 months 3,264 · prior 12 4,119(-21%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Summit Petroleum LLCOct 2012 → Feb 2017
- 2True Oil Company LLCDec 2014 → Mar 2016
- 3COG Operating LLCMar 2017 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 787503-99 | Drill | Summit Petroleum LLC | May 20, 2014 | Aug 11, 2014 | Oct 13, 2014 | 13,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jan 20, 2015 | Sylvia O-9-18037 | Spraberry (Trend Area) | COG Operating LLC | Producing | 10,910 |
Formation tops
As filed on W-2/G-1. Subsea from 2,807 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yates | 2,520 | 287 |
| Grayburg | 4,735 | -1,928 |
| San AndresSAN ANDRES - SALTWATER FLOW | 4,745 | -1,938 |
| Clear ForkCLEARFORK | 6,530 | -3,723 |
| Spraberry | 7,345 | -4,538 |
| Wolfcamp | 8,695 | -5,888 |
| Strawn | 10,230 | -7,423 |
| Devonian | — | — |
| Ellenburger | — | — |
| Fusselman | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,336 | 10,848 | Perforated |
| 7,338 | 10,848 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 1,224 | 13 | 925 S |
| 5.5 | 10,910 | 7.875 | 1,020 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 | Apr 23, 2015 | Mar 11, 2015 | Yes |
| 00 | Feb 18, 2015 | Jan 29, 2015 | 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 42-461-39519 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-461-39519 → 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/46139519, documented in the API reference.