OPERATORS · RRC 123872 · P-5 STATUS Y
Calk Oil Co
Lytle, TX
Watch this operatorCalk Oil CO has filed no drilling permits in the past 12 months; its most recent permit was issued September 27, 2012.
The RRC wellbore file lists 45 wells under its operatorship (33 producing).
Lease reports credit it with 2.3K barrels of oil and 0 mcf of gas in the 12 months reported through April 2026, down 16% on the year before.
2 drilling permits have been issued to this operator number since 2012; its P-5 organization report was last filed April 4, 2026.
- 0
- permits, last 12 months
- —
- vs prior 12 months (0)
- 0
- counties, 12 months
- 33
- producing wells, of 45 of record
- 18
- leases it reports
- —
- horizontal, 12 months
WINDOWS ON THE RRC ISSUE DATE · COMPUTED OCT 29, 2026
Where
Counties by permits in the last 12 months, with all-time permits and current wells of record there.
All 2 permits, searchable → · Leases it reports → · On the map →
Formations in its completed wells
Tops reported on completion filings for wells it operates. RRC wellbore file. About tops →
Production by month
PDQ LEASE REPORTS · REPORTED THROUGH APR 2026
Barrels on leases where this operator filed the production report. Lease-level by design; the latest months are revised upward as late reports arrive. How production is reported →
- 2.3K
- bbl oil, last 12 reported months
- -16%
- vs the 12 months before
- 0
- mcf gas incl. casinghead, last 12
- 89.6K
- bbl oil since reporting began
Oil, barrels
Last 12 months 2,298 · prior 12 2,722(-16%)
Beyond the permit record
RRC wellbore file
Wells of record
- 45
- on the schedule
- 33
- producing
- 0
- shut in
- 0
- injection
- 0
- temp. abandoned
- 11
- plugged
How it got them
- 0
- permitted itself
- 45
- acquired from others
- 2
- permitted, now run by others
Acquired means the well's permit names a different operator than the schedule does today. Transfers and operator numbers →
Permit types
Last 12 months against the prior 12, and all time. A type opens the permit history filtered to it. What the types mean →
| Type | 12 mo | Prior 12 | All time |
|---|---|---|---|
| Drill | 0 | 0 | 2 |
Fields
RRC regulatory fields with the most wells of record under this operator. The field opens its page; the count opens this operator's wells in it.
P-5 organization report
As registered with the RRC. About the P-5 →
- Registration
- Status code Y
- Last filed Apr 4, 2026
- Oil operator
- Address
- PO Box 94
- Lytle, TX 78052
- (830) 772-4068
- Officers and agents
- Calk, Roger D · Sole Proprietor
Latest permits
NEWEST FIRST BY ISSUE DATE · FILED OR ON WELLS IT NOW OPERATES
| Permit | Seen | Issued | Operator | County | Lease / well | Depth | API |
|---|---|---|---|---|---|---|---|
| 748293 | Sep 27, 2012 | Sep 27, 2012 | Calk Oil Company | Bexar | Calk, E.W. #12 | 1,600 | 02938286 |
| 748292 | Sep 27, 2012 | Sep 27, 2012 | Calk Oil Company | Bexar | Calk, E.W. #15 | 1,600 | 02938285 |
| 466982 | Oct 3, 1997 | Oct 3, 1997 | Property Development Group, Inc. | Atascosa | Fowler, Sam J. -A- #10 | 2,500 | 01334100 |
| 326744 | Feb 19, 1987 | Feb 19, 1987 | Campbell, L. W. | Atascosa | Fowler, Ima "C" #22 | 2,500 | 01333807 |
| 297542 | Feb 11, 1986 | Feb 11, 1986 | Campbell, L. W. | Atascosa | Fowler, Sam J. #9A | 2,500 | 01333728 |
| 297734 | Feb 10, 1986 | Feb 10, 1986 | CG Oil Co. | Bexar | Miller, D. #10 | 1,325 | 02937289 |
| 296188 | Jan 22, 1986 | Jan 22, 1986 | CG Oil Co. | Bexar | Miller, D. #11 | 1,325 | 02937206 |
| 295799 | Jan 21, 1986 | Jan 21, 1986 | CG Oil Co. | Bexar | Miller, D. #2 | 1,325 | 02937199 |
| 295414 | Jan 15, 1986 | Jan 15, 1986 | CG Oil Co. | Bexar | Miller, D. #3 | 1,325 | 02937141 |
| 295417 | Jan 15, 1986 | Jan 15, 1986 | CG Oil Co. | Bexar | Miller, D. #4 | 1,325 | 02937142 |
| 295215 | Jan 14, 1986 | Jan 14, 1986 | CG Oil Co. | Bexar | Miller, D. #9 | 1,325 | 02937117 |
| 295210 | Jan 14, 1986 | Jan 14, 1986 | CG Oil Co. | Bexar | Miller, D. #7 | 1,325 | 02937115 |
| 295212 | Jan 14, 1986 | Jan 14, 1986 | CG Oil Co. | Bexar | Miller, D. #8 | 1,325 | 02937116 |
| 294247 | Jan 3, 1986 | Jan 3, 1986 | CG Oil Co. | Bexar | Miller, D. #1 | 1,325 | 02937053 |
| 294086 | Jan 2, 1986 | Jan 2, 1986 | CG Oil Co. | Bexar | Miller, D. #6 | 1,325 | 02936991 |
About this data
Registration from the RRC P-5 organization report, refreshed weekly. Permits from the OGA049M master and daily daf420 files; wells of record from the EWA wellbore schedule; production from PDQ lease reports at the last vintage; disposal from UIC permits and H-10 reports. Summary figures are rebuilt nightly.
Developers: this page as JSON is GET /v1/data/operators/tx/123872, documented in the API reference.