TEXAS · WELLS · MARTIN COUNTY · CHIEFTAIN LEASE · API 42-317-35727 · DISTRICT 7B
Chieftain #1
Martin County · Spraberry (Trend Area) field · Shut In · Vertical
Chieftain #1 (API 42-317-35727) is a well in Martin County operated by Civitas Permian Operating LLC, completed March 12, 2010 and listed as shut in on the RRC schedule, shut in October 1, 2022.
The RRC has issued one drilling permit, issued November 17, 2009, permitted to 9,155 ft.
It was permitted by Pioneer Natural Res. USA, Inc. and has since transferred to Civitas Permian Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Spraberry, Dean, Wolfcamp.
Its lease has reported 34.9K barrels of oil and 56K mcf of gas since March 2010, last reporting volume in March 2025.
Operator of record
Permitted by Pioneer Natural Res. USA, Inc.; the EWA schedule now lists a different operator.
- Based in
- Midland, TX
- P-5 status
- Active (A)
- P-5 last filed
- Oct 21, 2025
- Permits on file
- 487
- Phone
- (303) 861-8140
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Civitas Permian Operating LLC |
| Production reports | Civitas Permian Operating, LLCthrough Mar 2025 |
| Latest permit | Pioneer Natural Res. USA, Inc.Nov 17, 2009 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 9,155
- total depth, ft
- 1
- permits on file
- Nov 17, 2009
- last permit issued
- Mar 12, 2010
- completed
- 34.9K
- cumulative oil, bbl
- 56K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2010 THROUGH Mar 2025
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 12, 2010
- Shut in
- Oct 1, 2022
- 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 lease this well is completed on; this well is the only one on it.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Chieftain O-10-39840 | Spraberry (Trend Area) | Civitas Permian Operating, LLC | 1 | 34.9K | 56K | Mar 2010 – Mar 2025 |
Oil, barrels lease total
Last 12 months 0 · prior 12 17(-100%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Pioneer Natural Res. USA, Inc.Mar 2010 → May 2020
- 2Hunt Oil CompanyJun 2020 → Jul 2021
- 3Vencer Energy, LLCAug 2021 → Dec 2023
- 4Civitas Permian Operating, LLCMar 2025 → Mar 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 687324-99 | Drill | Pioneer Natural Res. USA, Inc. | Nov 12, 2009 | Nov 17, 2009 | Dec 29, 2009 | 9,500 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 12, 2010 | Chieftain O-10-39840 | Spraberry (Trend Area) | Civitas Permian Operating LLC | Shut In · shut in Oct 1, 2022 | 9,155 |
Formation tops
As filed on W-2/G-1. Subsea from 2,598 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 6,972 | 8,449 | Perforated |
| 8,549 | 8,906 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 328 | 11 | 200 S |
| 4.5 | 9,145 | 7.875 | 415 S |
| — | 9,145 | 7.875 | 215 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 | Jun 11, 2010 | May 20, 2010 | — |
| 00 | May 6, 2010 | Apr 26, 2010 | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received May 17, 2010. Neutron. 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 |
|---|---|---|---|---|
| NEUTRON POROSITYSpans Spraberry, Dean, Wolfcamp | TIFF | 3,500 to 9,126 | May 17, 2010run Jan 16, 2010 | 2.83 |
"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 42-317-35727 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-317-35727 → 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/31735727, documented in the API reference.