WELL · 42-427-34737 · DISTRICT 4
I.V. Montalvo C #54
Starr County · Sun North (6340) field · Vertical
I.V. Montalvo C #54 (API 42-427-34737) is a well in Starr County operated by Killam Oil CO. Ltd., completed September 6, 2016.
The RRC has issued 4 drilling permits (amended once) between 2016 and 2020, permitted to 7,000 ft.
Completion filings report 8 formation tops, including Catahoula, Vicksburg, Cook Mountain, Jackson.
Its 4 leases have reported 445K barrels of oil and 1.18M mcf of gas since August 2016, last reporting in July 2026. The leases carry 11 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 Apr 2026 |
| Latest permit | Killam Oil Co., Ltd.Jan 8, 2020 |
- 7,000
- total depth, ft
- 5
- permits on file
- Jan 8, 2020
- last permit issued
- Sep 6, 2016
- completed
- 445K
- cumulative oil, bbl
- 1.18M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2016 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- OFF SCHEDULE
- Completed
- Sep 6, 2016
- Shut in
- —
- Plugged
- —
Surface location
26.695349, -98.479877
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 4 leases this well is completed on; they carry 11 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| I. V. Montalvo 'C' O-4-14004 | Sun,north (5470) | Killam Oil Co., Ltd. | 2 | 67.7K | 164K | Aug 2016 – 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' G-4-284712 | Sun, North (5810) | Killam Oil Co., Ltd. | 1 | 0 | 107K | Aug 2018 – Mar 2020 |
| I.V. Montalvo 'C' G-4-281263 | Sun, North (6340) | Killam Oil Co., Ltd. | 1 | 0 | 216K | Sep 2016 – Sep 2017 |
Gas, mcf lease total
Last 12 months 30,687 · prior 12 31,247(-2%)
Oil, barrels lease total
Last 12 months 2,853 · prior 12 2,311(+23%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Killam Oil Co., Ltd.Oct 2016 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 860546-99 | Recompletion | Killam Oil Co., Ltd. | Jan 2, 2020 | Jan 8, 2020 | May 2, 2019 | 5,630 |
| 844252-99 | Recompletion | Killam Oil Co., Ltd. | Aug 31, 2018 | Sep 4, 2018 | Aug 8, 2018 | 5,870 |
| 828596-99 | Recompletion | Killam Oil Co., Ltd. | Jul 7, 2017 | Jul 13, 2017 | — | 6,280 |
| 816165-98 | Drill | Killam Oil Co., Ltd. | Oct 20, 2016 | Jun 9, 2016 | Aug 10, 2016 | 7,000 |
| 816165-99 | Drill | Killam Oil Co., Ltd. | Jun 8, 2016 | Jun 9, 2016 | — | 7,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| — | — G-4-281263 | — | — | — | — |
| — | — G-4-284712 | — | — | — | — |
| — | — O-4-14004 | — | — | — | — |
| — | — O-4-14050 | — | — | — | — |
Formation tops
As filed on W-2/G-1. Subsea from 330 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| CatahoulaCATAHOULA-ANAHUAC - INJECTION/DI | 1,380 | -1,050 |
| CatahoulaCATAHOULA-FRIO - INJECTION/DISPO | 3,540 | -3,210 |
| VicksburgVICKSBURG - INJECTION/DISPOSAL; | 5,679 | -5,349 |
| Cook Mountain | — | — |
| JacksonJACKSON - INJECTION/DISPOSAL | — | — |
| Miocene (undifferentiated)MIOCENE-LAGARTO-OAKVILLE - INJEC | — | — |
| Queen CityQUEEN CITY - INJECTION/DISPOSAL | — | — |
| Wilcox | — | — |
| Yegua | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 5,415 | 5,420 | Perforated |
| 5,440 | 5,446 | Perforated |
| 5,451 | 5,454 | Perforated |
| 5,522 | 5,533 | Perforated |
| 5,693 | 5,696 | Perforated |
| 5,939 | 5,949 | Perforated |
| 6,343 | 6,350 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 8.625 | 1,150 | 12.25 | 440 S |
| 4.5 | 6,500 | 7.875 | 935 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 | Oct 9, 2025 | Jun 26, 2025 | — |
| 00 | Mar 9, 2020 | Jan 14, 2020 | — |
| 00 | Sep 27, 2018 | Sep 17, 2018 | — |
| 00 | Aug 17, 2017 | Aug 14, 2017 | — |
| 00 | Nov 14, 2016 | Oct 28, 2016 | 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 42-427-34737 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-427-34737 → 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'42-427-34747
0.1 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 |
| Wilcox | — | |
| Cook Mountain | — |
13 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34739
0.4 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 |
| Queen City | — |
14 TOPS · FIRST 8
Montalvo 'B' Unit42-427-34751
0.6 KM · Killam Oil Co., Ltd. · Section with this well →
| Miocene (undifferentiated) | 1,400 | -1,074 |
| Catahoula | 3,660 | -3,334 |
| Catahoula | 5,600 | -5,274 |
| Vicksburg | 8,229 | -7,903 |
| Cook Mountain | — | |
| Jackson | — | |
| Queen City | — | |
| Wilcox | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34742
0.8 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 |
| Jackson | — | |
| Queen City | — |
12 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34767
0.8 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,270 | -934 |
| Catahoula | 3,451 | -3,115 |
| Vicksburg | 5,865 | -5,529 |
| Yegua | — | |
| Cook Mountain | — | |
| Jackson | — | |
| Miocene (undifferentiated) | — | |
| Queen City | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34766
1.0 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,314 | -994 |
| Catahoula | 3,521 | -3,201 |
| Vicksburg | 5,780 | -5,460 |
| Wilcox | — | |
| Yegua | — | |
| Queen City | — | |
| Miocene (undifferentiated) | — | |
| Jackson | — |
9 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34736
1.1 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,310 | -989 |
| Catahoula | 1,310 | -989 |
| Catahoula | 1,310 | -989 |
| Frio | 3,670 | -3,349 |
| Catahoula | 3,670 | -3,349 |
| Catahoula | 3,670 | -3,349 |
| Vicksburg | 5,680 | -5,359 |
| Vicksburg | 5,680 | -5,359 |
16 TOPS · FIRST 8
I.V. Montalvo 'C'42-427-34743
1.3 KM · Killam Oil Co., Ltd. · Section with this well →
| Catahoula | 1,328 | -1,010 |
| Catahoula | 1,328 | -1,010 |
| Catahoula | 3,496 | -3,178 |
| Catahoula | 3,496 | -3,178 |
| Vicksburg | 5,762 | -5,444 |
| Vicksburg | 5,762 | -5,444 |
| Queen City | — | |
| Miocene (undifferentiated) | — |
13 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/42734737, documented in the API reference.