TEXAS · WELLS · ZAPATA COUNTY · DERLY LEASE · API 42-505-33259 · DISTRICT 04
Derly #4
Zapata County · Exsun (Lobo Cons.) field · Producing · Vertical
- Fields on the latest permit · any of 2
- Exsun (Lobo) · Exsun (Wilcox 7900)
- 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.
Derly #4 (API 42-505-33259) is a well in Zapata County operated by Hilcorp Energy Company, completed December 13, 1994 and listed as producing on the RRC schedule, shut in October 1, 2020.
The RRC has issued one drilling permit, issued October 13, 1994, permitted to 10,800 ft.
It was permitted by Transtexas Gas Corporation and has since transferred to Hilcorp Energy Company on the wellbore schedule.
Completion filings report 3 formation tops, including Wilcox, B/Wilcox, Wills Point.
Its lease has reported 9 barrels of oil and 484K mcf of gas since December 1994, with no volume in the three years through August 2026.
Operator of record
Permitted by Transtexas Gas Corporation; the EWA schedule now lists a different operator.
- Based in
- Houston, TX
- P-5 status
- Active (A)
- P-5 last filed
- Mar 27, 2026
- Permits on file
- 3,458
- Phone
- (713) 209-2400
SOURCE · RRC EWA WELLBORE SCHEDULE
What each RRC source says
| Wellbore schedule | Hilcorp Energy Company |
| Production reports | Hilcorp Energy Companythrough Jun 2022 |
| Latest permit | Transtexas Gas CorporationOct 13, 1994 |
The sources disagree, which usually means a transfer or a lease-level production filing by a different entity. Petrora goes with the schedule.
- 10,800
- total depth, ft
- 1
- permits on file
- Oct 13, 1994
- last permit issued
- Dec 13, 1994
- completed
- 9
- cumulative oil, bbl
- 484K
- cumulative gas, mcf
PRODUCTION FROM PDQ LEASE REPORTS · DEC 1994 THROUGH JUN 2022
Regulatory status · RRC wellbore file
- Schedule
- ON SCHEDULE
- Completed
- Dec 13, 1994
- Shut in
- Oct 1, 2020
- 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.
Wells nearby
Every well with a location on file around this well, 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 AUG 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 |
|---|---|---|---|---|---|---|
| Derly G-4-152451 | Exsun (Lobo Cons.) | Hilcorp Energy Company | 1 | 9 | 484K | Dec 1994 – Jun 2022 |
No volumes reported on these leases in the last three years.
Wells named Derly
Hilcorp Energy Company's other wells filed under this lease name in Zapata County, newest permit first. The RRC gives a gas well its own lease number, so the name is what joins the wells of a unit.
Loading the lease's wellsChain of custody
Every operator that reported production on this well's lease, in order.
- 1Transtexas Gas CorporationDec 1994 → Jun 1996
- 2Houston Exploration Company, TheJul 1996 → Jun 2007
- 3Forest Oil CorporationJul 2007 → Dec 2012
- 4Hilcorp Energy CompanyJan 2013 → Jun 2022
Permits
| Permit | Type | Operator | Received | Issued | Spud | Depth |
|---|---|---|---|---|---|---|
| 429042-99 | Drill | Transtexas Gas Corporation | Oct 13, 1994 | Oct 13, 1994 | Oct 21, 1994 | 10,800 |
Completions
| Completed | Lease | Field | Operator | Status | Depth |
|---|---|---|---|---|---|
| Dec 13, 1994 | Derly G-4-152451 | Exsun (Lobo Cons.) | Hilcorp Energy Company | Producing · shut in Oct 1, 2020 | 10,800 |
Formation tops
As filed on W-2/G-1. Subsea from 466 ft elevation.Download CSV →
| Formation | MD ft | Subsea |
|---|---|---|
| Wilcox | 4,300 | -3,834 |
| B/Wilcox | 6,550 | -6,084 |
| Wills Point | 10,600 | -10,134 |
Perforations
Perforated and open-hole intervals.
| From | To | Type |
|---|---|---|
| 9,249 | 10,236 | Perforated |
Casing
Strings as reported, shallowest first.
| Casing in | Set at | Hole in | Cement |
|---|---|---|---|
| 9.625 | 749 | 12.25 | 330 S |
| 7 | 6,601 | 8.75 | 270 S |
| 3.5 | 10,770 | 6.125 | 567 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 | Mar 21, 1995 | Dec 29, 1994 | Yes |
| 00 | Jan 31, 1995 | — | — |
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 42-505-33259 → W-2, G-1, plugging reports, as PDFs
- Completion packets for 42-505-33259 → scanned completion filings
Log images filed since 2004 open from the RRC's log search for this well; none are loaded here 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/50533259, documented in the API reference.