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BLOCK 31 UNIT

CRANE County · District 8 · OXY USA EOR LLC · BLOCK 31 (DEVONIAN)

Permits

1

Max Depth

9,350 ft

First Permit

1984-10-26

Latest Activity

1984-10-26

Lifespan

< 1 yr

Regulatory Status

Schedule

ON SCHEDULE

Completion

1984-12-19

Shut-In

Plugged

P-5 Org Status: Active

!

EWA / Production operator mismatch

Scheduling: OXY USA EOR LLC ≠ Production: OXY USA INC. (reported 2026-04)

!

EWA / Permit operator mismatch

Scheduling: OXY USA EOR LLC ≠ Permit: ARCO OIL & GAS CO.

Resolved via: productionOXY USA INC.

Production Summary

Cum Oil

bbl

Cum Gas

mcf

First Production

1993-01

Last Production

2026-07

Injection / Disposal

H-1 Injection Active UIC #000053102 permitted 1994-09-27

Permitted Volume

10,000 mcf/d

Max Pressure

5,500 psi

Injection Interval

8,450–9,250 ft

Injected (12mo)

Monthly injected volume (bbl, from H-10 filings through 2025-06-01)

Lease Production

Production is reported at the lease level. View production data, decline curves, and history on the lease page.

Formation Tops (3) Elevation 2,556 ft (GR)

CSV
FormationTop Depth (MD)Subsea (+above / −below SL)
PENN (Pennsylvanian)7,174 ft-4,618 ft
BARNETT 7,845 ft-5,289 ft
DEVONIAN 8,476 ft-5,920 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 (1)

IntervalType
8,545–9,211 ftPerforated

Casing (2)

SizeSet DepthCement
8.625"3,617 ft1,600 sx
5.5"9,235 ft500 sx

Permit History (1)

Applications (1)

#255654 A ARCO OIL & GAS CO.
received 1984-10-22

Records & Logs

2 completion filings on record.

W-2/G-1 1985-02-15
W-2/G-1 1985-02-23
Completion packets + logs ↗ Wellbore filings ↗

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

Coordinates come from the RRC GIS backfill and usually appear within days of permit issuance. Located in CRANE County.

Well Details

Well Number
A8S
Max Depth
9,350 ft
Drill Type
Vertical
County
CRANE
District
8
Completed
1984-12-19

Operator

Location
HOUSTON
P-5 Status
Active (filed 2025-12-22)
Cum Oil (all leases)
— bbl
Cum Gas (all leases)
— mcf
Activities
OPRS/G, OPRS/O