TEXAS · WELLS · ATASCOSA COUNTY · CHACHALACA UNIT LEASE · API 42-013-35132 · DISTRICT 01
Chachalaca Unit #1H
Atascosa County · Eagleville (Eagle Ford-1) field · Producing · Horizontal
Chachalaca Unit #1H (API 42-013-35132) is a horizontal well in Atascosa County operated by Trailblazer Energy Resources LLC, completed May 28, 2015 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued August 20, 2014, permitted to 7,122 ft.
It was permitted by Eog Resources, Inc. and has since transferred to Trailblazer Energy Resources LLC on the wellbore schedule.
Completion filings report 10 formation tops, including Queen City, Reklaw, Wilcox, Carrizo.
Its lease has reported 195K barrels of oil and 120K mcf of gas since May 2015, last reporting in July 2026.
Operator of record
Trailblazer Energy Resources LLC
Permitted by EOG Resources, Inc.; the EWA schedule now lists a different operator.
- Based in
- Tulsa, OK
- P-5 status
- Active (A)
- P-5 last filed
- Oct 16, 2025
- Permits on file
- 30
- Phone
- (918) 728-3020
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Trailblazer Energy Resources LLC |
| Production reports | Trailblazer Energy Resources,llcthrough Apr 2026 |
| Latest permit | EOG Resources, Inc.Aug 20, 2014 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,122
- total depth, ft
- 1
- permits on file
- Aug 20, 2014
- last permit issued
- May 28, 2015
- completed
- 195K
- cumulative oil, bbl
- 120K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2015 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 28, 2015
- Shut in
- —
- 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 |
|---|---|---|---|---|---|---|
| Chachalaca Unit O-1-18418 | Eagleville (Eagle Ford-1) | Trailblazer Energy Resources,llc | 1 | 195K | 120K | May 2015 – Jul 2026 |
Oil, barrels lease total
Last 12 months 4,912 · prior 12 6,625(-26%)
Gas, mcf lease total
Last 12 months 2,256 · prior 12 2,815(-20%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1EOG Resources, Inc.May 2015 → Jul 2022
- 2Pillar Efs, LLCAug 2022 → Jan 2026
- 3Trailblazer Energy Resources,llcFeb 2026 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 791808-99 | Drill | EOG Resources, Inc. | Jul 16, 2014 | Aug 20, 2014 | Nov 5, 2014 | 10,200 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| May 28, 2015 | Chachalaca Unit O-1-18418 | Eagleville (Eagle Ford-1) | Trailblazer Energy Resources LLC | Producing | 7,122 |
Formation tops
As filed on W-2/G-1. Subsea from 332 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Queen City | 1,278 | -946 |
| Reklaw | 2,238 | -1,906 |
| WilcoxWILCOX - DISPOSAL | 2,460 | -2,128 |
| Carrizo | 2,461 | -2,129 |
| Bartosh | 4,173 | -3,841 |
| NavarroNAVARRO - H2S | 6,355 | -6,023 |
| EscondidoESCONDIDO - H2S, DISPOSAL | 6,356 | -6,024 |
| OlmosOLMOS - DISPOSAL | 7,067 | -6,735 |
| AnacachoANACACHO - H2S | 8,250 | -7,918 |
| Austin ChalkAUSTIN CHALK - H2S, DISPOSAL | 8,494 | -8,162 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,743 | 15,851 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 5,340 | 12.25 | 1,394 S |
| 5.5 | 15,946 | 8.5 | 1,944 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 | Sep 17, 2015 | Jul 2, 2015 | Yes |
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 42-013-35132 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-35132 → 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/01335132, documented in the API reference.