TEXAS · WELLS · MIDLAND COUNTY · API 42-329-31463 · DISTRICT 7B
Preston Spraberry Unit #21
Midland County · Spraberry (Trend Area) field · Vertical
- Permitted field
- Spraberry(trend Area Dean-Wlfcp)
Preston Spraberry Unit #21 (API 42-329-31463) is a well in Midland County operated by Pioneer Natural Res. USA Inc., completed August 25, 1994.
The RRC has issued one drilling permit, issued December 27, 1984, permitted to 9,200 ft.
It was permitted by Mobil Producing TX. & N.M. Inc. and has since transferred to Pioneer Natural Res. USA Inc. on the wellbore schedule.
Completion filings report 3 formation tops, including Spraberry, Dean, Wolfcamp.
Its 3 leases have reported 18M barrels of oil and 54.7M mcf of gas since January 1993, last reporting volume in February 2026. The leases carry 425 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Mobil Producing TX. & N.M. Inc.; the EWA schedule now lists a different operator.
- Based in
- Spring, TX
- P-5 status
- Active (A)
- P-5 last filed
- Jul 8, 2026
- Permits on file
- 15,633
- Phone
- (972) 444-4001
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Pioneer Natural Res. USA Inc. |
| Production reports | Pioneer Natural Res. USA, Inc.through Feb 2026 |
| Latest permit | Mobil Producing TX. & N.M. Inc.Dec 27, 1984 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,200
- total depth, ft
- 1
- permits on file
- Dec 27, 1984
- last permit issued
- Aug 25, 1994
- completed
- 18M
- cumulative oil, bbl
- 54.7M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Feb 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Aug 25, 1994
- Shut in
- —
- Plugged
- —
Surface location
No coordinates on the permit record yet. The RRC's GIS record usually lands within days of issuance; historical master-file permits never carry one.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 3 leases this well is completed on; they carry 425 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Preston Spraberry Unit O-10-18551 | Spraberry (Trend Area) | Pioneer Natural Res. USA, Inc. | 391 | 17.8M | 54.3M | Jan 1993 – Feb 2026 |
| Bowles, D. T. O-10-33714 | Spraberry (Trend Area) | Pioneer Natural Res. USA, Inc. | 17 | 145K | 392K | Mar 1993 – Oct 2015 |
| Bowles, D. T. O-10-23365 | Spraberry(trend Area Dean-Wlfcp) | Parker & Parsley Development Co. | 17 | 7.66K | 17.5K | Jan 1993 – Feb 1993 |
Oil, barrels lease total
Last 12 months 84,304 · prior 12 181,969(-54%)
Gas, mcf lease total
Last 12 months 435,059 · prior 12 736,247(-41%)
Wells named Preston Spraberry Unit
Pioneer Natural Res. USA Inc.'s other wells filed under this lease name in Midland County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Parker & Parsley Development Co.Jan 1993 → Feb 1995
- 2Parker & Parsley Development L.PMar 1995 → Aug 1997
- 3Pioneer Natural Res. USA, Inc.Sep 1997 → Feb 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 262215-99 | Drill | Mobil Producing TX. & N.M. Inc. | Nov 30, 1984 | Dec 27, 1984 | Mar 23, 1985 | 9,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 25, 1994 | Preston Spraberry Unit O-10-18551 | Spraberry (Trend Area) | Pioneer Natural Res. USA Inc. | Not on Schedule | — |
| Oct 3, 1985 | Bowles D. T. O-10-23365 | Spraberry(trend Area Dean-Wlfcp) | Parker & Parsley Development Co. | Not on Schedule | — |
| Oct 3, 1985 | Bowles D. T. O-10-33714 | Spraberry (Trend Area) | Pioneer Natural Res. USA Inc. | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,730 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,067 | 7,273 | Perforated |
| 7,791 | 8,023 | Perforated |
| 8,473 | 8,727 | Perforated |
| 8,769 | 8,943 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 445 | 17.5 | 425 S |
| 13.375 | 445 | — | — |
| 8.625 | 5,600 | 12.25 | 3,050 S |
| 8.625 | 5,600 | — | — |
| 5.5 | 9,100 | 7.875 | 900 S |
| 5.5 | 9,100 | — | — |
Completion filings
W-2 and G-1 reports on record in the RRC wellbore file, newest first. The suffix identifies the wellbore or completion event. The record date is the RRC's own date on the record, not the day the report was filed: 462,034 of the state's filings carry 1984-01-12. About these reports →
| Suffix | RRC record date | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Oct 27, 1994 | Sep 20, 1994 | — |
| 00 | Sep 30, 1994 | Nov 5, 1985 | — |
| 00 | Mar 17, 1993 | Nov 5, 1985 | — |
| 00 | Nov 22, 1985 | Nov 5, 1985 | — |
| 00 | Jun 10, 1985 | May 21, 1985 | — |
| 00 | Jun 8, 1985 | — | — |
The source documents
Petrora holds the structured record. The scanned filings live at the RRC; these links open its search already filled in for this API.
- Wellbore filings for 42-329-31463 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-31463 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here for it.
About this data
Permits from the RRC OGA049M master and daily daf420 files; wellbore and operator of record from the EWA schedule, weekly; completions, formation tops, casing, and perforations from the dbf900 wellbore file; production from PDQ lease reports, which lag two to three months; injection from UIC permits, H-10 reports, and TexNet daily volumes; earthquakes from the TexNet catalog.
New to these records? How to read a well page · API numbers · completion reports and tops · why production is by lease
Developers: this page as JSON is GET /v1/data/wells/32931463, documented in the API reference.