TEXAS · WELLS · ATASCOSA COUNTY · API 42-013-34381 · DISTRICT 01
Heard Bower Central Unit #4H
Atascosa County · Eagleville (Eagle Ford-1) field · Shut In · Horizontal
- Fields on the latest permit · any of 2
- Eagleville (Eagle Ford-1) · Sugarkane (Eagle Ford)
- Not one formation; the well must be completed in one of them, and no target formation is stated.
Heard Bower Central Unit #4H (API 42-013-34381) is a horizontal well in Atascosa County operated by Marathon Oil EF LLC, completed September 23, 2011 and listed as shut in on the RRC schedule, shut in December 1, 2024.
The RRC has issued one drilling permit, issued May 27, 2011, permitted to 11,020 ft.
It was permitted by Cinco Natural Resources Corp. and has since transferred to Marathon Oil EF LLC on the wellbore schedule.
Completion filings report 3 formation tops, including Olmos, Austin Chalk, Eagle Ford.
Its 2 leases have reported 2.26M barrels of oil and 2.84M mcf of gas since September 2011, last reporting volume in April 2026. The leases carry 16 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Cinco Natural Resources Corp.; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Sep 26, 2025
- Permits on file
- 3,191
- Phone
- (832) 486-2737
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Marathon Oil EF LLC |
| Production reports | Marathon Oil EF LLCthrough Apr 2026 |
| Latest permit | Cinco Natural Resources Corp.May 27, 2011 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 11,020
- total depth, ft
- 1
- permits on file
- May 27, 2011
- last permit issued
- Sep 23, 2011
- completed
- 2.26M
- cumulative oil, bbl
- 2.84M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Sep 2011 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Sep 23, 2011
- Shut in
- Dec 1, 2024
- 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.
Wells nearby
Every well with a location on file around this well, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 2 leases this well is completed on; they carry 16 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Heard Bower West Unit O-1-15760 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 9 | 1.26M | 1.48M | Sep 2011 – Apr 2026 |
| Heard Bower Central Unit O-1-15822 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | 7 | 998K | 1.36M | Sep 2011 – Apr 2026 |
Oil, barrels lease total
Last 12 months 33,565 · prior 12 22,040(+52%)
Gas, mcf lease total
Last 12 months 44,804 · prior 12 22,074(+103%)
Wells named Heard Bower Central Unit
Marathon Oil EF LLC's other wells filed under this lease name in Atascosa County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Cinco Natural Resources Corp.Sep 2011 → Feb 2013
- 2Aurora USA Development, LLCMar 2013 → May 2014
- 3Baytex USA Development, LLCJun 2014 → Jun 2016
- 4Teal Operating, LLCJul 2016 → Oct 2021
- 5Marathon Oil EF LLCNov 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 717322-99 | Drill | Cinco Natural Resources Corp. | May 26, 2011 | May 27, 2011 | Jun 24, 2011 | 10,959 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Sep 23, 2011 | Heard Bower Central Unit O-1-15822 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Shut In · shut in Dec 1, 2024 | 11,020 |
| Sep 23, 2011 | Heard Bower West Unit O-1-15760 | Eagleville (Eagle Ford-1) | Marathon Oil EF LLC | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Download CSV →
| Formation | MD ft |
|---|---|
| Olmos | 8,120 |
| Austin Chalk | 10,632 |
| Eagle Ford | 10,771 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 11,090 | 15,184 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 358 | 17.5 | 335 S |
| 9.625 | 5,660 | 12.25 | 1,525 S |
| 5.5 | 15,211 | 8.5 | 2,045 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 | Apr 14, 2014 | Mar 23, 2012 | Yes |
| 00 | Apr 10, 2014 | Mar 23, 2012 | Yes |
| 00 | May 25, 2012 | Mar 23, 2012 | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received Jul 23, 2014. 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 |
|---|---|---|---|---|
| RESISTIVITYSpans Olmos, Austin Chalk, Eagle Ford | TIFF | 5,596 to 15,222 | Jul 23, 2014run Jul 19, 2011 | 13.3 |
"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 42-013-34381 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-013-34381 → 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/01334381, documented in the API reference.