TEXAS · WELLS · GRIMES COUNTY · BRONCO LEASE · API 42-185-30700 · DISTRICT 03
Bronco #4
Grimes County · Giddings (Austin Chalk-3) field · Producing · Horizontal
Bronco #4 (API 42-185-30700) is a horizontal well in Grimes County operated by Magnolia Oil & Gas Operating LLC, completed May 2, 2006 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued October 3, 2005, permitted to 14,353 ft.
It was permitted by Marathon Oil Company and has since transferred to Magnolia Oil & Gas Operating LLC on the wellbore schedule.
Completion filings report one formation top, including Austin Chalk.
Its lease has reported 2 barrels of oil and 1.08M mcf of gas since May 2006, last reporting volume in April 2026.
Operator of record
Magnolia Oil & Gas Operating LLC
Permitted by Marathon Oil Company; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 6, 2026
- Permits on file
- 617
- Phone
- (713) 842-9050
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Magnolia Oil & Gas Operating LLC |
| Production reports | Magnolia Oil & Gas Operating LLCthrough Apr 2026 |
| Latest permit | Marathon Oil CompanyOct 3, 2005 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 14,353
- total depth, ft
- 1
- permits on file
- Oct 3, 2005
- last permit issued
- May 2, 2006
- completed
- 2
- cumulative oil, bbl
- 1.08M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · May 2006 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- May 2, 2006
- 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 |
|---|---|---|---|---|---|---|
| Bronco G-3-218442 | Giddings (Austin Chalk-3) | Magnolia Oil & Gas Operating LLC | 1 | 2 | 1.08M | May 2006 – Apr 2026 |
Gas, mcf lease total
Last 12 months 10,604 · prior 12 12,575(-16%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Marathon Oil CompanyMay 2006 → Aug 2009
- 2Enervest Operating, L.L.C.Sep 2009 → May 2016
- 3Magnolia Oil & Gas Operating LLCJan 2019 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 607162-99 | Drill | Marathon Oil Company | Sep 30, 2005 | Oct 3, 2005 | — | 14,400 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| May 2, 2006 | Bronco G-3-218442 | Giddings (Austin Chalk-3) | Magnolia Oil & Gas Operating LLC | Producing | 14,353 |
Formation tops
As filed on W-2/G-1. Subsea from 294 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Austin Chalk | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 13,900 | 17,675 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 2,435 | 17.5 | 1,980 S |
| 9.625 | 12,842 | 12.25 | 805 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 | Jan 12, 2007 | Jul 28, 2006 | Yes |
| 00 | Aug 25, 2006 | — | — |
Well logs
1 log loaded from the RRC's log index, the latest received Jul 24, 2009. Cased hole. 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 |
|---|---|---|---|---|
| SURVEYS CASED HOLE | 2 TIFF | 14,149 to 17,641 | Jul 24, 2009run Feb 26, 2006 | 0.88 + 0.48 |
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 42-185-30700 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-185-30700 → 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/18530700, documented in the API reference.