WELL · 42-029-36837 · DISTRICT 1
Iltis Mathilda #39
Bexar County · Fairfield field · Producing · Vertical
Iltis Mathilda #39 (API 42-029-36837) is a well in Bexar County operated by Simco Oil LLC, completed February 28, 1986 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued November 5, 1985, permitted to 13,006 ft.
It was permitted by Colstar Petroleum, Corp. and has since transferred to Simco Oil LLC on the wellbore schedule.
Completion filings report one formation top, including Anachacho.
Its lease has reported 4.69K barrels of oil and 15 mcf of gas since January 1993, last reporting in July 2026. The lease carries 5 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Colstar Petroleum, Corp.; the EWA schedule now lists a different operator.
Lytle, TX · P-5 Y, filed Dec 4, 2025 · (210) 606-8512
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Simco Oil LLC |
| Production reports | Simco Oil, LLCthrough Feb 2026 |
| Latest permit | Colstar Petroleum, Corp.Nov 5, 1985 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 13,006
- total depth, ft
- 1
- permits on file
- Nov 5, 1985
- last permit issued
- Feb 28, 1986
- completed
- 4.69K
- cumulative oil, bbl
- 15
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Jan 1993 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Feb 28, 1986
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: 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; they carry 5 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Iltis, Mathilda O-1-11378 | Fairfield | Simco Oil, LLC | 5 | 4.69K | 15 | Jan 1993 – Jul 2026 |
Oil, barrels lease total
Last 12 months 25 · prior 12 78(-68%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Shepherd Oil Co.Jan 1993 → Aug 1993
- 2Rao Oil CompanySep 1993 → Oct 1994
- 3Ginco Operating Co.Jun 1995 → Oct 1995
- 4LPG Energy CompanyJul 1998 → Jan 1999
- 5Simco OilJul 2005 → Dec 2013
- 6Simco Oil, LLCJan 2014 → Feb 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 289258-99 | Drill | Colstar Petroleum, Corp. | Nov 5, 1985 | Nov 5, 1985 | — | 13,006 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-1-11378 | — | — | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 1,107 | 1,126 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 4.5 | 1,212 | 6.75 | 150 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 | Apr 16, 1986 | Mar 28, 1986 | Yes |
| 00 | Apr 8, 1986 | — | — |
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 42-029-36837 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-029-36837 → 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/02936837, documented in the API reference.