42-003-34435
Final CompletionUNIVERSITY 155
ANDREWS County · District 8 · HIGHMARK ENERGY OPERATING LLC · SHAFTER LAKE (ELLENBURGER)
Permits
1
Max Depth
11,825 ft
First Permit
1984-08-13
Latest Activity
1984-08-13
Lifespan
< 1 yr
Regulatory Status
Schedule
OFF SCHEDULE
Completion
—
Shut-In
—
Plugged
—
EWA / Permit operator mismatch
Scheduling: HIGHMARK ENERGY OPERATING LLC ≠ Permit: ARCO OIL & GAS CO.
Resolved via: scheduling → HIGHMARK ENERGY OPERATING 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 (6) Elevation 3,229 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| YATES | 3,000 ft | +229 ft |
| SAN ANDRES | 4,468 ft | -1,239 ft |
| CLEARFORK (Clear Fork) | 5,800 ft | -2,571 ft |
| WICHITA ALBANY (Wichita-Albany) | 6,902 ft | -3,673 ft |
| DEVONIAN | 9,310 ft | -6,081 ft |
| ELLENBURGER | 11,600 ft | -8,371 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 (2)
| Interval | Type |
|---|---|
| 11,580–11,596 ft | Perforated |
| 11,603–11,656 ft | Perforated |
Casing (6)
| Size | Set Depth | Cement |
|---|---|---|
| 13.375" | 360 ft | 400 sx |
| 13.375" | 360 ft | 400 sx |
| 8.625" | 4,300 ft | 2,700 sx |
| 8.625" | 4,300 ft | 2,700 sx |
| 5.5" | 11,687 ft | 2,300 sx |
| 5.5" | 11,687 ft | 2,300 sx |
Permit History (1)
Applications (1)
Records & Logs
5 completion filings on record.
Completion packets open directly (post-2011 filings include attached logs). Log images and the UL library can't be deep-linked — clicking copies the API for you to paste.
No GPS coordinates yet
Well Details
- Well Number
- F8
- Max Depth
- 11,825 ft
- Drill Type
- Vertical
- County
- ANDREWS
- District
- 8
- Operator
- HIGHMARK ENERGY OPERATING LLC
Operator
- Location
- HOUSTON
- P-5 Status
- Active (filed 2026-03-09)
- Cum Oil (all leases)
- 4,551,977 bbl
- Cum Gas (all leases)
- 30,465,409 mcf
- Activities
- CSGD/G, G/PUR, GTHS/G, OPRS/G, OPRS/O
- Total Permits
- 15