TEXAS · WELLS · MIDLAND COUNTY · TXL HOLZGRAF Z4 LEASE · API 42-329-44612 · DISTRICT 6E
TXL Holzgraf Z4 #2315LH
Midland County · Pegasus (Consolidated) field · Producing · Horizontal
Txl Holzgraf Z4 #2315LH (API 42-329-44612) is a horizontal well in Midland County operated by Cog Operating LLC, completed August 22, 2021 and listed as producing on the RRC schedule.
The RRC has issued one drilling permit, issued January 20, 2021, permitted to 8,992 ft.
Completion filings report 10 formation tops, including Santa Rosa, Rustler, Yates, Seven Rivers.
Its lease has reported 509K barrels of oil and 667K mcf of gas since August 2021, last reporting volume in April 2026.
Operator of record
- Based in
- Midland, TX
- P-5 status
- Active – Extension (X)
- P-5 last filed
- Jun 2, 2026
- Permits on file
- 4,568
- Phone
- (432) 683-7443
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | COG Operating LLC |
| Production reports | COG Operating LLCthrough Apr 2026 |
| Latest permit | COG Operating LLCJan 20, 2021 |
- 8,992
- total depth, ft
- 1
- permits on file
- Jan 20, 2021
- last permit issued
- Aug 22, 2021
- completed
- 509K
- cumulative oil, bbl
- 667K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · Aug 2021 THROUGH Apr 2026
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Aug 22, 2021
- Shut in
- —
- Plugged
- —
Operator's P-5 on the schedule: Active (A)
Surface location
31.674111, -102.180528 NAD27, as filed
31.674244, -102.180944 WGS84
Permit surface location from the RRC GIS record, referenced to NAD27 as the RRC files it; the WGS84 pair is the same point through NOAA's NADCON grid, and the map link uses it, in Midland County.
Wells nearby
Every well with a location on file around this one, in any state, nearest first.
Texas locations come from drilling permits, so most older Texas wells have none and are not listed.
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 |
|---|---|---|---|---|---|---|
| TXL Holzgraf Z4 O-9-21452 | Pegasus (Consolidated) | COG Operating LLC | 1 | 509K | 667K | Aug 2021 – Apr 2026 |
Oil, barrels lease total
Last 12 months 34,277 · prior 12 50,521(-32%)
Gas, mcf lease total
Last 12 months 38,815 · prior 12 111,990(-65%)
Chain of custody
Every operator that reported production on this well's lease, in order.
- 1COG Operating LLCAug 2021 → Apr 2026
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 867070-99 | Drill | COG Operating LLC | Jan 14, 2021 | Jan 20, 2021 | Jan 28, 2021 | 12,000 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Aug 22, 2021 | TXL Holzgraf Z4 O-9-21452 | Pegasus (Consolidated) | COG Operating LLC | Producing | 8,992 |
Formation tops
As filed on W-2/G-1. Subsea from 2,888 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Santa Rosa | 1,140 | 1,748 |
| Rustler | 2,002 | 886 |
| Yates | 3,122 | -234 |
| Seven Rivers | 3,382 | -494 |
| Queen | 4,058 | -1,170 |
| Grayburg | 4,483 | -1,595 |
| San AndresSAN ANDRES - HIGH FLOWS, H2S, CO | 5,086 | -2,198 |
| Glorieta | 5,771 | -2,883 |
| Clear ForkCLEARFORK | 7,293 | -4,405 |
| Spraberry | 8,070 | -5,182 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,175 | 19,157 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 13.375 | 439 | 17.5 | 525 S |
| 9.625 | 8,279 | 12.25 | 1,755 S |
| 5.5 | 19,260 | 8.5 | 2,360 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 4, 2022 | Dec 10, 2021 | Yes |
Well logs
1 log loaded from the RRC's log index, 1 of it with a digital LAS file, the latest received Feb 19, 2024. Gamma ray. 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 |
|---|---|---|---|---|
| Gamma RaySpans Santa Rosa, Rustler, Yates, Seven Rivers, Queen, Grayburg, San Andres, Glorieta, Clear Fork, Spraberry | LAS + TIFF | 0 to 9,171 | Feb 19, 2024 | 2.96 + 7.93 |
"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 42-329-44612 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-329-44612 → scanned completion filings
The logs loaded for this well are under Well logs, with the RRC's log search for it.
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 neighbors, subsea-aligned so they line up regardless of surface terrain.
TXL Holzgraf Z542-329-44611
0.0 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,140 | 1,748 |
| Rustler | 2,002 | 886 |
| Yates | 3,122 | -234 |
| Seven Rivers | 3,382 | -494 |
| Queen | 4,058 | -1,170 |
| Grayburg | 4,483 | -1,595 |
| San Andres | 5,086 | -2,198 |
| Glorieta | 5,771 | -2,883 |
10 TOPS · FIRST 8
TXL Holzgraf Z342-329-44613
0.0 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,140 | 1,748 |
| Rustler | 2,002 | 886 |
| Yates | 3,122 | -234 |
| Seven Rivers | 3,382 | -494 |
| Queen | 4,058 | -1,170 |
| Grayburg | 4,483 | -1,595 |
| San Andres | 5,086 | -2,198 |
| Glorieta | 5,771 | -2,883 |
10 TOPS · FIRST 8
TXL Holzgraf Z242-329-44615
0.3 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 1,140 | 1,748 |
| Rustler | 2,002 | 886 |
| Yates | 3,122 | -234 |
| Seven Rivers | 3,382 | -494 |
| Queen | 4,058 | -1,170 |
| Grayburg | 4,483 | -1,595 |
| San Andres | 5,086 | -2,198 |
| Glorieta | 5,771 | -2,883 |
10 TOPS · FIRST 8
TXL Holzgraf Z142-329-44614
0.3 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 867 | 2,021 |
| Rustler | 1,722 | 1,166 |
| Yates | 2,816 | 72 |
| Seven Rivers | 3,000 | -112 |
| Queen | 3,720 | -832 |
| Grayburg | 4,000 | -1,112 |
| San Andres | 4,781 | -1,893 |
| Glorieta | 5,428 | -2,540 |
10 TOPS · FIRST 8
Apache Flats SWD42-329-47379
1.7 KM · Discovery Operating, Inc. · Section with this well →
| Santa Rosa | 218 | 2,665 |
| Rustler | 1,748 | 1,135 |
| Yates | 2,857 | 26 |
| Seven Rivers | 3,050 | -167 |
| Queen | 3,857 | -974 |
| Grayburg | 4,461 | -1,578 |
| San Andres | 4,629 | -1,746 |
| Spraberry | — |
10 TOPS · FIRST 8
Pegasus Field Unit 342-329-43872
2.3 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 933 | 1,948 |
| Yates | 2,735 | 146 |
| Seven Rivers | 3,000 | -119 |
| Queen | 4,002 | -1,121 |
| Grayburg | 4,294 | -1,413 |
| San Andres | 4,712 | -1,831 |
| Glorieta | 5,378 | -2,497 |
| Clear Fork | 6,945 | -4,064 |
10 TOPS · FIRST 8
Pegasus Field Unit 342-329-43871
2.3 KM · COG Operating LLC · Section with this well →
| Santa Rosa | 933 | 1,948 |
| Yates | 2,899 | -18 |
| Seven Rivers | 3,200 | -319 |
| Queen | 3,667 | -786 |
| Grayburg | 4,297 | -1,416 |
| San Andres | 4,807 | -1,926 |
| Glorieta | 5,421 | -2,540 |
| Clear Fork | 6,903 | -4,022 |
10 TOPS · FIRST 8
Geronimo (SA) A42-329-39930
2.6 KM · Discovery Operating, Inc. · Section with this well →
| Santa Rosa | 1,077 | 1,810 |
| Yates | 2,843 | 44 |
| Seven Rivers | 3,215 | -328 |
| Queen | 4,206 | -1,319 |
| Grayburg | 4,471 | -1,584 |
| San Andres | 4,842 | -1,955 |
| Glorieta | 5,499 | -2,612 |
| Clear Fork | 6,215 | -3,328 |
15 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/32944612, documented in the API reference.