42-173-31708
Final CompletionCALVERLEY 27
GLASSCOCK County · District 8 · COG OPERATING LLC · SPRABERRY (TREND AREA)
Permits
1
Max Depth
9,000 ft
First Permit
1984-10-04
Latest Activity
1984-10-04
Lifespan
< 1 yr
Regulatory Status
Schedule
OFF SCHEDULE
Completion
1985-01-20
Shut-In
—
Plugged
—
EWA / Production operator mismatch
Scheduling: COG OPERATING LLC ≠ Production: DIAMONDBACK E&P LLC (reported 2026-04)
EWA / Permit operator mismatch
Scheduling: COG OPERATING LLC ≠ Permit: COX, JOHN L.
Resolved via: production → DIAMONDBACK E&P LLC
Production Summary Production data is a work in progress — still being validated against RRC filings. Spot something off or have questions? [email protected]
Cum Oil
— bbl
Cum Gas
— mcf
First Production
1993-01
Last Production
2026-07
Operator History
Chain of Custody
Lease Production
Production is reported at the lease level. View production data, decline curves, and history on the lease page.
Formation Tops (4) Elevation 2,700 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| REDBEDS | 300 ft | +2,400 ft |
| UPPER SPRABERRY (Spraberry) | 6,750 ft | -4,050 ft |
| LOWER SPRABERRY (Spraberry) | 7,300 ft | -4,600 ft |
| DEAN | 8,120 ft | -5,420 ft |
As reported by operators on W-2/G-1 completion filings (RRC wellbore records). Depths are measured depth; names appear as filed. Subsea = reported elevation − measured depth (negative = below sea level; vertical wellbores only). View filings & logs at RRC ↗
Perforations (3)
| Interval | Type |
|---|---|
| 6,752–6,778 ft | Perforated |
| 7,300–7,764 ft | Perforated |
| 8,122–8,460 ft | Perforated |
Casing (3)
| Size | Set Depth | Cement |
|---|---|---|
| 13.375" | 360 ft | 400 sx |
| 8.625" | 4,207 ft | 1,000 sx |
| 4.5" | 8,800 ft | 1,400 sx |
Permit History (1)
Applications (1)
Records & Logs
4 completion filings on record.
Completion packets open directly (post-2011 filings include attached logs). Log images can't be deep-linked — clicking copies the API for you to paste.
No GPS coordinates yet
Well Details
- Well Number
- 4
- Max Depth
- 9,000 ft
- Drill Type
- Vertical
- County
- GLASSCOCK
- District
- 8
- Operator
- COG OPERATING LLC
- Completed
- 1985-01-20
Operator
- Name
- COG OPER LLC
- Location
- MIDLAND
- P-5 Status
- X (filed 2026-06-02)
- Cum Oil (all leases)
- 645,285,792 bbl
- Cum Gas (all leases)
- 305,183,488 mcf
- Activities
- OPRS/G, OPRS/O
- Total Permits
- 4,547