WELL · 42-427-34743 · DISTRICT 4
I.V. Montalvo C #58
Starr County · Sun North (Vicksburg 5980) field · Vertical
I.V. Montalvo C #58 (API 42-427-34743) is a well in Starr County operated by Killam Oil CO. Ltd., completed June 27, 2024.
The RRC has issued 3 drilling permits (amended once) between 2017 and 2025, permitted to 7,000 ft.
Completion filings report 8 formation tops, including Catahoula, Vicksburg, Cook Mountain, Jackson.
Its 3 leases have reported 449K barrels of oil and 956K mcf of gas since February 2017, last reporting in July 2026. The leases carry 10 wells, so these are lease totals, not this well alone.
Operator of record
Laredo, TX · P-5 Y, filed Feb 4, 2026 · 837 permits on file · (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 Oct 2025 |
| Latest permit | Killam Oil Co., Ltd.Oct 20, 2025 |
- 7,000
- total depth, ft
- 4
- permits on file
- Oct 20, 2025
- last permit issued
- Jun 27, 2024
- completed
- 449K
- cumulative oil, bbl
- 956K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Feb 2017 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Jun 27, 2024
- Shut in
- —
- Plugged
- —
Surface location
26.707129, -98.478803
OpenStreetMap → · Google Maps →
Permit surface location from the RRC GIS record, in Starr County.
Lease production
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Texas reports oil by lease, not by well. These are the 3 leases this well is completed on; they carry 10 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| I. V. Montalvo 'C' O-4-14026 | Sun, North (5810) | Killam Oil Co., Ltd. | 2 | 69.3K | 253K | Feb 2017 – Jul 2026 |
| I.V. Montalvo 'C' O-4-14050 | Sun, North (Vicksburg 5980) | Killam Oil Co., Ltd. | 7 | 378K | 692K | Jun 2017 – Jul 2026 |
| I.V. Montalvo 'C' O-4-14055 | Sun (6210 Vicksburg) | Killam Oil Co., Ltd. | 1 | 1.65K | 11.3K | May 2017 – Nov 2017 |
Gas, mcf lease total
Last 12 months 108 · prior 12 19,393(-99%)
Oil, barrels lease total
Last 12 months 239 · prior 12 965(-75%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Killam Oil Co., Ltd.Mar 2017 → Oct 2025
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 911185-99 | Recompletion | Killam Oil Co., Ltd. | Oct 15, 2025 | Oct 20, 2025 | — | 5,822 |
| 830833-99 | Recompletion | Killam Oil Co., Ltd. | Sep 11, 2017 | Sep 15, 2017 | — | 6,090 |
| 825009-98 | Drill | Killam Oil Co., Ltd. | Aug 31, 2017 | Apr 6, 2017 | Apr 11, 2017 | 7,000 |
| 825009-99 | Drill | Killam Oil Co., Ltd. | Mar 31, 2017 | Apr 6, 2017 | — | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — O-4-14026 | — | — | — | — |
| — | — O-4-14050 | — | — | — | — |
| — | — O-4-14055 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 318 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| CatahoulaCATAHOULA-ANAHUAC - INJECTION/DI | 1,328 | -1,010 |
| CatahoulaCATAHOULA-ANAHUAC-INJECTION/DISP | 1,328 | -1,010 |
| CatahoulaCATAHOULA-FRIO - INJECTION/DISPO | 3,496 | -3,178 |
| CatahoulaCATAHOULA-FRIO-INJECTION/DISPOSA | 3,496 | -3,178 |
| VicksburgVICKSBURG - INJECTION/DISPOSAL; | 5,762 | -5,444 |
| VicksburgVICKSBURG-INJECTION/DISPOSAL;GEO | 5,762 | -5,444 |
| Cook Mountain | — | — |
| JacksonJACKSON - INJECTION/DISPOSAL | — | — |
| Miocene (undifferentiated)MIOCENE-LAGARTO-OAKVILLE - INJEC | — | — |
| Miocene (undifferentiated)MIOCENE-LAGARTO-OAKVILLE-INJECTI | — | — |
| Queen CityQUEEN CITY - INJECTION/DISPOSAL | — | — |
| Wilcox | — | — |
| Yegua | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,675 | 5,680 | Perforated |
| 5,692 | 5,695 | Perforated |
| 5,854 | 5,861 | Perforated |
| 5,923 | 5,930 | Perforated |
| 6,120 | 6,125 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,196 | 12.25 | 415 S |
| 4.5 | 6,694 | 7.875 | 811 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 | Jul 10, 2026 | Jun 23, 2026 | — |
| 00 | Mar 18, 2026 | Feb 13, 2026 | Yes |
| 00 | Sep 16, 2024 | Aug 16, 2024 | — |
| 00 | Sep 6, 2023 | May 19, 2023 | — |
| 00 | Oct 16, 2017 | Sep 22, 2017 | Yes |
| 00 | Sep 14, 2017 | Sep 8, 2017 | 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 42-427-34743 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-34743 → 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.
Nearby wells and their tops
NEAREST 8 LOCATED WELLS WITH TOPS · WITHIN 16 KM
Draw a cross-section
This well's tops beside its 5 nearest neighbours, subsea-aligned so they line up regardless of surface terrain.
I.V. Montalvo 'C'42-427-34766
0.3 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,314 | -994 |
| Catahoula | 3,521 | -3,201 |
| Vicksburg | 5,780 | -5,460 |
| Jackson | — | |
| Cook Mountain | — | |
| Yegua | — | |
| Wilcox | — | |
| Queen City | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34736
0.4 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,310 | -989 |
| Catahoula | 1,310 | -989 |
| Catahoula | 1,310 | -989 |
| Catahoula | 3,670 | -3,349 |
| Catahoula | 3,670 | -3,349 |
| Frio | 3,670 | -3,349 |
| Vicksburg | 5,680 | -5,359 |
| Vicksburg | 5,680 | -5,359 |
16 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34742
0.6 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,300 | -976 |
| Catahoula | 1,300 | -976 |
| Catahoula | 3,662 | -3,338 |
| Catahoula | 3,662 | -3,338 |
| Vicksburg | 5,820 | -5,496 |
| Vicksburg | 5,820 | -5,496 |
| Cook Mountain | — | |
| Yegua | — |
12 TOPS · FIRST 8
Montalvo 'B' (North) Unit42-427-34790
0.6 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,358 | -1,045 |
| Catahoula | 3,535 | -3,222 |
| Vicksburg | 5,780 | -5,467 |
| Yegua | — | |
| Cook Mountain | — | |
| Jackson | — | |
| Miocene (undifferentiated) | — | |
| Queen City | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34739
0.9 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,395 | -1,065 |
| Catahoula | 1,395 | -1,065 |
| Catahoula | 3,560 | -3,230 |
| Catahoula | 3,560 | -3,230 |
| Catahoula | 3,560 | -3,230 |
| Vicksburg | 5,760 | -5,430 |
| Vicksburg | 5,760 | -5,430 |
| Miocene (undifferentiated) | — |
14 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34747
1.2 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,275 | -943 |
| Catahoula | 1,275 | -943 |
| Catahoula | 3,492 | -3,160 |
| Catahoula | 3,492 | -3,160 |
| Vicksburg | 5,750 | -5,418 |
| Vicksburg | 5,750 | -5,418 |
| Cook Mountain | — | |
| Jackson | — |
13 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34737
1.3 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,380 | -1,050 |
| Catahoula | 3,540 | -3,210 |
| Vicksburg | 5,679 | -5,349 |
| Yegua | — | |
| Jackson | — | |
| Cook Mountain | — | |
| Miocene (undifferentiated) | — | |
| Queen City | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34767
1.5 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,270 | -934 |
| Catahoula | 3,451 | -3,115 |
| Vicksburg | 5,865 | -5,529 |
| Queen City | — | |
| Wilcox | — | |
| Cook Mountain | — | |
| Yegua | — | |
| Jackson | — |
9 TOPS · FIRST 8
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/42734743, documented in the API reference.