TEXAS · WELLS · HEMPHILL COUNTY · ZYBACH 66 LEASE · API 42-211-33798 · DISTRICT 08
Zybach 66 #18R
Hemphill County · Buffalo Wallow (Granite Wash) field · Producing · Vertical
Zybach 66 #18R (API 42-211-33798) is a well in Hemphill County operated by Unbridled Resources LLC, completed March 7, 2007 and listed as producing on the RRC schedule, shut in September 1, 2017.
The RRC has issued one drilling permit, issued December 14, 2006, permitted to 13,452 ft.
It was permitted by Dominion Oklahoma Texas E&P, Inc and has since transferred to Unbridled Resources LLC on the wellbore schedule.
Completion filings report 6 formation tops, including T/Cleveland Mkr, T/Carr Granite Wash, T/Caldwell Granite Wash, T/Britt Granite Wash.
Its lease has reported 14.1K barrels of oil and 518K mcf of gas since March 2007, with no volume in the three years through April 2026.
Operator of record
Permitted by Dominion Oklahoma Texas E&P, Inc; the EWA schedule now lists a different operator.
- Based in
- Oklahoma City, OK
- P-5 status
- Active (A)
- P-5 last filed
- Dec 17, 2025
- Permits on file
- 6
- Phone
- (318) 751-3917
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Unbridled Resources LLC |
| Production reports | Unbridled Resources, LLCthrough Aug 2017 |
| Latest permit | Dominion Oklahoma Texas E&P, IncDec 14, 2006 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,452
- total depth, ft
- 1
- permits on file
- Dec 14, 2006
- last permit issued
- Mar 7, 2007
- completed
- 14.1K
- cumulative oil, bbl
- 518K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2007 THROUGH Aug 2017
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Mar 7, 2007
- Shut in
- Sep 1, 2017
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
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 |
|---|---|---|---|---|---|---|
| Zybach 66 G-14-228121 | Buffalo Wallow (Granite Wash) | Unbridled Resources, LLC | 1 | 14.1K | 518K | Mar 2007 – Aug 2017 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Dominion Oklahoma Texas E&P, IncMar 2007 → Aug 2007
- 2Linn Operating, Inc.Oct 2007 → Dec 2014
- 3Enervest Operating, L.L.C.Jan 2015 → Aug 2017
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 630533-99 | Drill | Dominion Oklahoma Texas E&P, Inc | Dec 14, 2006 | Dec 14, 2006 | Jan 11, 2007 | 14,450 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Mar 7, 2007 | Zybach 66 G-14-228121 | Buffalo Wallow (Granite Wash) | Unbridled Resources LLC | Producing · shut in Sep 1, 2017 | 13,452 |
Formation tops
As filed on W-2/G-1. Subsea from 2,703 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| T/Cleveland MKR | 10,283 | -7,580 |
| T/Carr Granite Wash | 10,994 | -8,291 |
| T/Caldwell Granite Wash | 11,062 | -8,359 |
| T/Britt Granite Wash | 11,174 | -8,471 |
| T/Granite Wash D MKR | 12,092 | -9,389 |
| T/Atoka Wash | 12,629 | -9,926 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,196 | 13,370 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 3,347 | 12.25 | 1,835 S |
| 5.5 | 13,500 | 7.875 | 585 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 | Jul 20, 2007 | Apr 16, 2007 | Yes |
| 00 | Jul 18, 2007 | — | — |
Well logs
2 logs loaded from the RRC's log index, the latest received Sep 11, 2008. Density, Neutron, Resistivity. 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/DENSITY POROSITYSpans T/Carr Granite Wash, T/Caldwell Granite Wash, T/Britt Granite Wash, T/Granite Wash D Mkr, T/Atoka Wash | TIFF | 11,000 to 13,462 | Sep 11, 2008run Feb 10, 2007 | 1.50 |
| RESISTIVITYSpans T/Carr Granite Wash, T/Caldwell Granite Wash, T/Britt Granite Wash, T/Granite Wash D Mkr, T/Atoka Wash | TIFF | 11,000 to 13,462 | Sep 11, 2008run Feb 10, 2007 | 2.67 |
"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 42-211-33798 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-211-33798 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search 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/21133798, documented in the API reference.