TEXAS · WELLS · WARD COUNTY · API 42-475-35807 · DISTRICT 7B
Underwood 34-138 Unit #1H
Ward County · Sandbar (Bone Spring) field · Producing · Horizontal
Underwood 34-138 Unit #1H (API 42-475-35807) is a horizontal well in Ward County operated by Anadarko E&P Onshore LLC, completed July 31, 2011 and listed as producing on the RRC schedule.
The RRC has issued 2 drilling permits between 2011 and 2017, permitted to 10,998 ft.
Completion filings report one formation top, including Bone Spring.
Its 2 leases have reported 201K barrels of oil and 268K mcf of gas since July 2011, last reporting volume in March 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Oct 22, 2025
- Permits on file
- 4,576
- Phone
- (713) 215-7000
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Anadarko E&P Onshore LLC |
| Production reports | Anadarko E&P Onshore LLCthrough Mar 2026 |
| Latest permit | Anadarko E&P Onshore LLCFeb 17, 2017 |
- 10,998
- total depth, ft
- 2
- permits on file
- Feb 17, 2017
- last permit issued
- Jul 31, 2011
- completed
- 201K
- cumulative oil, bbl
- 268K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jul 2011 THROUGH Mar 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jul 31, 2011
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active – Extension (X)
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.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Underwood 34-138 Unit O-10-48695 | Sandbar (Bone Spring) | Anadarko E&P Onshore LLC | 1 | 89.9K | 120K | Nov 2016 – Mar 2026 |
| Underwood 34-138 Unit O-10-42457 | Phantom (Wolfcamp) | Anadarko E&P Onshore LLC | 1 | 111K | 147K | Jul 2011 – Oct 2016 |
Oil, barrels lease total
Last 12 months 2,897 · prior 12 4,437(-35%)
Gas, mcf lease total
Last 12 months 3,524 · prior 12 4,939(-29%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Anadarko Petroleum CorporationJul 2011 → Mar 2013
- 2Anadarko E&P Onshore LLCApr 2013 → Mar 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 823074-99 | Field transfer | Anadarko E&P Onshore LLC | Feb 9, 2017 | Feb 17, 2017 | Jun 2, 2011 | 16,000 |
| 716158-99 | Drill | Anadarko Petroleum Corporation | May 11, 2011 | May 13, 2011 | Jun 3, 2011 | 16,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jul 31, 2011 | Underwood 34-138 Unit O-10-48695 | Sandbar (Bone Spring) | Anadarko E&P Onshore LLC | Producing | 10,998 |
| Jul 31, 2011 | Underwood 34-138 Unit O-10-42457 | Phantom (Wolfcamp) | Anadarko E&P Onshore LLC | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 2,642 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Bone SpringBONE SPRING 1 | 9,499 | -6,857 |
| Bone SpringBONE SPRING 2 | 10,061 | -7,419 |
| Bone SpringBONE SPRING 3 | 10,802 | -8,160 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,536 | 15,185 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,019 | 12.25 | 645 S |
| 7 | 11,466 | 8.75 | 1,030 S |
| 9.625 | — | 12.25 | 1,310 S |
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 13, 2017 | Feb 22, 2017 | Yes |
| 00 | Apr 15, 2013 | Apr 30, 2012 | Yes |
Well logs
1 log loaded from the RRC's log index, 1 of it with a digital LAS file, the latest received Oct 17, 2018. Gamma ray. These are the logs loaded into Petrora from the Railroad Commission's inventories, not necessarily every log run on the well. The RRC holds the files; each opens from its log search for the well. The kind is the RRC's description of the log; the interval is the one filed for it.
Open the RRC's log search for this well ↗| Logas described | Files | Intervalft, as filed | Datereceived | SizeMB |
|---|---|---|---|---|
| Gamma RaySpans Bone Spring | LAS + TIFF | 0 to 15,359 | Oct 17, 2018 | 0.54 + 12.0 |
"Spans" is by this well's own filed formation tops: a formation runs from its top to the next deeper top filed, and the deepest runs to the bottom of the log. Depths are measured along the wellbore, so on a horizontal the lateral counts in the formation it was landed in.
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 42-475-35807 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-475-35807 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it. The University Lands library has no per-well link: then paste it into its search.
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/47535807, documented in the API reference.