WELL · 42-311-34039 · DISTRICT 1
Zavisch #12
McMullen County · A.W.P. (Olmos) field · Producing · Vertical
Zavisch #12 (API 42-311-34039) is a well in Mcmullen County operated by Gtg Operating LLC, completed May 29, 2008 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued April 1, 2008, permitted to 12,000 ft.
It was permitted by Welhausen Operating Company, LP and has since transferred to Gtg Operating LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Queen City, Carrizo, Olmos.
Its lease has reported 360K barrels of oil and 1.47M mcf of gas since January 1993, last reporting in July 2026. The lease carries 11 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Welhausen Operating Company, LP; the EWA schedule now lists a different operator.
Tyler, TX · P-5 Y, filed Oct 4, 2025 · 1 permits on file · (806) 445-4118
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | GTG Operating LLC |
| Production reports | GTG Operating, LLCthrough Feb 2026 |
| Latest permit | Welhausen Operating Company, LPApr 1, 2008 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 12,000
- total depth, ft
- 1
- permits on file
- Apr 1, 2008
- last permit issued
- May 29, 2008
- completed
- 360K
- cumulative oil, bbl
- 1.47M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 29, 2008
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active
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; they carry 11 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Zavisch O-1-12066 | A.W.P. (Olmos) | GTG Operating, LLC | 11 | 360K | 1.47M | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 1,362 · prior 12 2,179(-37%)
Gas, mcf lease total
Last 12 months 8,105 · prior 12 9,582(-15%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Sundance Resources, Inc.Jan 1993 → Aug 1994
- 2Regal Petroleum ServicesSep 1994 → Apr 2000
- 3Welhausen Operating Co., Inc.May 2000 → Oct 2001
- 4Welhausen Operating Company, LPNov 2001 → Dec 2011
- 5Layline Petroleum I, LLCJan 2012 → May 2013
- 6Wapiti Operating, LLCJun 2013 → Mar 2015
- 7Clearly Petroleum, LLCApr 2015 → Apr 2020
- 8GTG Operating, LLCMay 2020 → Feb 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 658224-99 | Drill | Welhausen Operating Company, LP | Mar 26, 2008 | Apr 1, 2008 | Apr 13, 2008 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-12066 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 301 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 3,112 | -2,811 |
| Carrizo | 4,808 | -4,507 |
| Olmos | 10,116 | -9,815 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 10,116 | 10,136 | Perforated |
| 10,142 | 10,162 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 1,518 | 12.25 | 453 S |
| 4.5 | 10,321 | 7.875 | 1,870 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. About these reports →
| Suffix | Filed | W-2 / G-1 date | Logs referenced |
|---|---|---|---|
| 00 | Nov 20, 2008 | Jun 18, 2008 | Yes |
| 00 | Nov 6, 2008 | — | — |
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 42-311-34039 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-311-34039 → scanned completion filings
Log images are in archives with no per-well link: the RRC's Neubus archive (2004 onward). then paste it into their 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/31134039, documented in the API reference.