42-103-31459
BLOCK 31 UNIT
CRANE County · District 8 · HILCORP ENERGY COMPANY · BLOCK 31 EAST (ATOKA)
Permits
1
Max Depth
9,000 ft
First Permit
1977-06-13
Latest Activity
1977-06-13
Lifespan
< 1 yr
Regulatory Status
Schedule
OFF SCHEDULE
Completion
1985-05-16
Shut-In
—
Plugged
—
EWA / Production operator mismatch
Scheduling: HILCORP ENERGY COMPANY ≠ Production: OXY USA INC. (reported 2026-04)
EWA / Permit operator mismatch
Scheduling: HILCORP ENERGY COMPANY ≠ Permit: ATLANTIC RICHFIELD CO.
Resolved via: production → OXY USA INC.
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 2,557 ft (GR)
CSV| Formation | Top Depth (MD) | Subsea (+above / −below SL) |
|---|---|---|
| WOODFORD | 7,533 ft | -4,976 ft |
| BARNETT | 7,561 ft | -5,004 ft |
| DEVONIAN | 8,016 ft | -5,459 ft |
| DEVONIAN 31 (Devonian) | 8,016 ft | -5,459 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 |
|---|---|
| 7,500–7,508 ft | Perforated |
| 8,085–8,718 ft | Perforated |
Casing (4)
| Size | Set Depth | Cement |
|---|---|---|
| 8.625" | 2,535 ft | 800 sx |
| 8.625" | 2,535 ft | 800 sx |
| 5.5" | 9,000 ft | 1,400 sx |
| 5.5" | 9,000 ft | 1,500 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
- C-4U&L
- Max Depth
- 9,000 ft
- Drill Type
- Vertical
- County
- CRANE
- District
- 8
- Operator
- HILCORP ENERGY COMPANY
- Completed
- 1985-05-16
Operator
- Name
- HILCORP ENGY CO
- Location
- HOUSTON
- P-5 Status
- X (filed 2026-03-27)
- Cum Oil (all leases)
- 75,699,281 bbl
- Cum Gas (all leases)
- 1,779,939,645 mcf
- Activities
- CSGD/G, CSGD/P, G/PUR, GTHS/C, GTHS/G, GTHS/O, OPRS/G, OPRS/O
- Total Permits
- 3,430