WELL · 42-283-34636 · DISTRICT 1
Sako Unit a Las #4H
LA Salle County · Eagleville (Eagle Ford-1) field · Shut IN · Horizontal
Sako Unit A Las #4H (API 42-283-34636) is a horizontal well in La Salle County operated by Ineos USA Oil & Gas LLC, completed June 11, 2015 and listed as shut in on the RRC schedule, shut in December 1, 2025.
The RRC has issued one drilling permit (amended once), issued March 20, 2014, permitted to 7,408 ft.
It was permitted by Chesapeake Operating, Inc. and has since transferred to Ineos USA Oil & Gas LLC on the wellbore schedule.
Completion filings report 10 formation tops, including Yegua, Queen City, Sparta, Wilcox.
Its lease has reported 1.07M barrels of oil and 1.77M mcf of gas since August 2012, last reporting in July 2026. The lease carries 6 wells, so these are lease totals, not this well alone.
Operator of record
Permitted by Chesapeake Operating, Inc.; the EWA schedule now lists a different operator.
- Based in
- Denver, CO
- P-5 status
- Active – Extension (X)
- P-5 last filed
- May 26, 2026
- Permits on file
- 98
- Phone
- (720) 764-3473
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Ineos USA Oil & Gas LLC |
| Production reports | Ineos USA Oil & Gas LLCthrough Apr 2026 |
| Latest permit | Chesapeake Operating, Inc.Mar 20, 2014 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 7,408
- total depth, ft
- 2
- permits on file
- Mar 20, 2014
- last permit issued
- Jun 11, 2015
- completed
- 1.07M
- cumulative oil, bbl
- 1.77M
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2012 THROUGH Jul 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Jun 11, 2015
- Shut in
- Dec 1, 2025
- 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; they carry 6 wells in total, so volumes are shared.Why →
| Lease | Field | Reporting operator | Wells | Oil, bbl | Gas, mcf | Reported |
|---|---|---|---|---|---|---|
| Sako Unit a Las O-1-16540 | Eagleville (Eagle Ford-1) | Ineos USA Oil & Gas LLC | 6 | 1.07M | 1.77M | Aug 2012 – Jul 2026 |
Oil, barrels lease total
Last 12 months 19,800 · prior 12 23,141(-14%)
Gas, mcf lease total
Last 12 months 44,864 · prior 12 29,900(+50%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1Chesapeake Operating, Inc.Sep 2012 → Oct 2014
- 2Chesapeake Operating, L.L.C.Nov 2014 → Mar 2023
- 3Ineos USA Oil & Gas LLCApr 2023 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 780363-98 | Drill | Chesapeake Operating, Inc. | Aug 27, 2014 | Mar 20, 2014 | Dec 16, 2014 | 9,000 |
| 780363-99 | Drill | Chesapeake Operating, Inc. | Feb 20, 2014 | Mar 20, 2014 | Dec 15, 2014 | 9,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Jun 11, 2015 | Sako Unit a Las O-1-16540 | Eagleville (Eagle Ford-1) | Ineos USA Oil & Gas LLC | Shut IN · shut in Dec 1, 2025 | 7,408 |
Formation tops
As filed on W-2/G-1. Subsea from 455 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Yegua | 920 | -465 |
| Queen City | 2,350 | -1,895 |
| Sparta | 2,350 | -1,895 |
| WilcoxWILCOX - DISPOSAL | 3,660 | -3,205 |
| Escondido | 3,891 | -3,436 |
| OlmosOLMOS - DISPOSAL | 5,011 | -4,556 |
| Austin Chalk | 6,972 | -6,517 |
| Eagle FordEAGLE FORD - H2S | 7,413 | -6,958 |
| BudaBUDA - H2S | — | — |
| EdwardsEDWARDS - H2S | — | — |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 7,746 | 15,028 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 2,497 | 12.25 | 886 S |
| 5.5 | 15,165 | 7.875 | 2,161 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 | Nov 5, 2015 | Jul 6, 2015 | 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 42-283-34636 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-283-34636 → 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.
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/28334636, documented in the API reference.