42-461-35455

Final Completion

XBC 85

UPTON County · District 7 · PIONEER NATURAL RES. USA INC. · SPRABERRY (TREND AREA)

Permits

Max Depth

11,000 ft

First Permit

2007-08-20

Latest Activity

2014-10-14

Lifespan

7 yrs

Regulatory Status

Schedule

OFF SCHEDULE

Completion

2007-11-30

Shut-In

—

Plugged

—

Production Summary

Cum Oil

— bbl

Cum Gas

— mcf

First Production

2007-11

Last Production

2026-07

Lease Production

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

Formation Tops (4) Elevation 2,683 ft (GL)

CSV

Formation	Top Depth (MD)	Subsea (+above / −below SL)
TOP UPPER SPRABERRY (Spraberry)	6,870 ft	-4,187 ft
TOP LOWER SPRABERRY (Spraberry)	7,463 ft	-4,780 ft
TOP DEAN (Dean)	8,279 ft	-5,596 ft
TOP WOLFCAMP (Wolfcamp)	8,474 ft	-5,791 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 (6)

Interval	Type
8,345–8,471 ft	Perforated
8,345–9,931 ft	Perforated
8,669–8,787 ft	Perforated
8,911–9,062 ft	Perforated
9,163–9,353 ft	Perforated
9,569–9,931 ft	Perforated

Casing (3)

Size	Set Depth	Cement
8.625"	523 ft	250 sx
8.625"	529 ft	250 sx
4.5"	10,330 ft	1,050 sx

Permit History (2)

#797388 Field Transfer Final Completion

XBC '85' · 10,335 ft

2014-10-14

Spud 2007-09-29

#644614 Drill Final Completion

XBC "85" · 11,000 ft

2007-08-20

Spud 2007-09-29

Applications (2)

#797388 A PIONEER NATURAL RES. USA, INC.

received 2014-09-30

#644614 A PIONEER NATURAL RES. USA, INC.

received 2007-08-17

Records & Logs

4 completion filings on record · 2 with log images at RRC.

W-2/G-1 2019-01-17

W-2/G-1 2014-10-23 log on file

W-2/G-1 2008-02-04 log on file

W-2/G-1 2008-03-10

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 UPTON County.

Well Details

Well Number: 857
Max Depth: 11,000 ft
Drill Type: Vertical
County: UPTON
District: 7
Operator: PIONEER NATURAL RES. USA INC.
Completed: 2007-11-30

Operator

Name: PIONEER NATURAL RES. USA, INC
Location: Y SPRING
P-5 Status: Active (filed 2025-08-01)
Cum Oil (all leases): 1,771,882,421 bbl
Cum Gas (all leases): 1,763,727,021 mcf
Activities: CSGD/G, CSGD/P, G/PUR, GTHS/G, GTHS/O, OPRS/G, OPRS/O
Total Permits: 15,400