TEXAS · WELLS · STARR COUNTY · API 42-427-34666 · DISTRICT 04
Montalvo Heirs B #1
Starr County · Sun North (F-2-1) field · Shut In · Vertical
- Fields on the latest permit · any of 7
- Sun, North (F-2-1) · Field 87124685 · Field 87124694 · Sun, North (Vicksburg 6410) · Field 87124698 · Sun, North (Vicksburg 6610) · Sun, North (5410)
- Not one formation; the well must be completed in one of them, and no target formation is stated. The district's wildcat field is also on the permit.
Montalvo Heirs B #1 (API 42-427-34666) is a well in Starr County operated by Killam Oil CO. Ltd., completed November 28, 2016 and listed as shut in on the RRC schedule, shut in August 1, 2015.
The RRC has issued one drilling permit (amended once), issued October 29, 2013, permitted to 6,500 ft.
Completion filings report 3 formation tops, including Frio, C-2, Vicksburg.
Its 2 leases have reported 1.31K barrels of oil and 138K mcf of gas since December 2013, with no volume in the three years through April 2026. The leases carry 2 wells, so these are lease totals, not this well alone.
Operator of record
- Based in
- Laredo, TX
- P-5 status
- Active (A)
- P-5 last filed
- Apr 9, 2026
- Permits on file
- 837
- Phone
- (956) 724-7141
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Killam Oil Co. Ltd. |
| Production reports | Killam Oil Co., Ltd.through Jan 2015 |
| Latest permit | Killam Oil Co., Ltd.Oct 29, 2013 |
- 6,500
- total depth, ft
- 2
- permits on file
- Oct 29, 2013
- last permit issued
- Nov 28, 2016
- completed
- 1.31K
- cumulative oil, bbl
- 138K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Mar 2014 THROUGH Jan 2015
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Nov 28, 2016
- Shut in
- Aug 1, 2015
- 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 2 leases this well is completed on; they carry 2 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Montalvo Heirs 'B' O-4-13927 | Sun, North (F-2-1) | Killam Oil Co., Ltd. | 1 | 817 | 17.3K | Dec 2013 – Jan 2015 |
| Montalvo Heirs 'B' G-4-273446 | Sun, North (F-2-1) | Killam Oil Co., Ltd. | 1 | 497 | 121K | Dec 2013 – Jun 2014 |
No volumes reported on these leases in the last three years.
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Killam Oil Co., Ltd.Mar 2014 → Jan 2015
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 772244-98 | Drill | Killam Oil Co., Ltd. | Feb 27, 2014 | Oct 29, 2013 | Nov 23, 2013 | 7,000 |
| 772244-99 | Drill | Killam Oil Co., Ltd. | Oct 22, 2013 | Oct 29, 2013 | — | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Nov 28, 2016 | Montalvo Heirs B O-4-13927 | Sun North (F-2-1) | Killam Oil Co. Ltd. | Shut In · shut in Aug 1, 2015 | 6,500 |
| Dec 19, 2013 | Montalvo Heirs B G-4-273446 | Sun North (F-2-1) | Killam Oil Co. Ltd. | Not on Schedule | — |
Formation tops
As filed on W-2/G-1. Subsea from 326 ft elevation.Download CSV →
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 4,235 | 4,245 | Perforated |
| 4,774 | 4,778 | Perforated |
| 5,116 | 5,121 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,156 | 12.25 | 455 S |
| 4.5 | 5,515 | 7.875 | 508 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 | Feb 7, 2017 | Jan 30, 2017 | — |
| 00 | Nov 30, 2015 | Nov 11, 2015 | Yes |
| 00 | Jun 8, 2015 | Aug 15, 2014 | Yes |
| 00 | Sep 11, 2014 | May 5, 2014 | Yes |
Well logs
1 log loaded from the RRC's log index, the latest received Feb 3, 2017. Density, Neutron. 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 |
|---|---|---|---|---|
| NEUTRON/DENSITY POROSITYSpans Frio, C-2, Vicksburg | TIFF | 1,155 to 6,506 | Feb 3, 2017run Dec 9, 2013 | 0.93 |
"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 42-427-34666 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-34666 → 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/42734666, documented in the API reference.