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COUNTIES · EAGLE FORD SHALE · DISTRICT 01 · CODE 029

Bexar County, Texas

The RRC's county figures put Bexar County at 43,153 bbl of oil and 12 Mcf of gas in the twelve months through August 2026; oil is down 23% on the twelve months before.

201 leases under 41 operators had production in those months.

Bexar County has had no new drilling permits in the past 90 days; the most recent permit on record was issued June 5, 2026.

JM Calk Operating, LLC leads with 7 permits in the past 12 months, one of 2 operators active in the county.

One operator filed a first Bexar County permit in the past year.

Median permitted depth over the past year is 1,500 ft (prior year: 410 ft); 0% of the past year's permits are horizontal.

The county has 9 active disposal and injection permits of 350 on file, with 7.98K barrels injected in the 12 months reported through September 2025.

1 earthquakes of magnitude 2 or more were located in the county's permit footprint over the past two years, the largest M2.1.

7,876 drilling permits have been issued in Bexar County since 1977.

7,876 permits on file since 1977 · last issued Jun 5, 2026

Email me new permits

Also: every Bexar County well in the statewide list, searchable → · a year of permits on the map →

1,926
active wells · 9,467 on file
41
producing operators, 12 months
201
producing leases, 12 months
43,153
bbl oil, 12 months through Aug 2026 · −23%
12
Mcf gas, same 12 months · +0%

RRC COUNTY FIGURES · NO. 174 IN OIL AND NO. 201 IN GAS OF 219 PRODUCING TEXAS COUNTIES

Bexar County oil and gas production

RRC COUNTY FIGURES · THROUGH AUG 2026

Texas operators report production by lease, and the Railroad Commission totals it by county. Where a lease lies in more than one county, the split between them is the RRC's. Oil includes condensate; gas includes casinghead gas. Leases are still filing for Aug 2026, so that month and the twelve-month totals will rise.

12 months through Aug 2026 43,153 · prior 12 56,166(-23%)

05K10K2017201820192020202120222023202420252026

Latest months

MonthOilGas
Aug 2026still arriving2,118 bbl1 Mcf
Jul 20263,373 bbl1 Mcf
Jun 20263,633 bbl1 Mcf
May 20263,288 bbl1 Mcf
Apr 20263,782 bbl1 Mcf
Mar 20263,725 bbl1 Mcf
Feb 20263,862 bbl1 Mcf
Jan 20263,648 bbl1 Mcf
Dec 20254,030 bbl1 Mcf
Nov 20254,067 bbl1 Mcf
Oct 20253,818 bbl1 Mcf
Sep 20253,809 bbl1 Mcf

Operators by production

12 MONTHS THROUGH AUG 2026

  1. Koko Skadi, LLC32 leases

    5.67K bbl · 0 Mcf

  2. Drachen Oil Company18 leases

    3.78K bbl · 0 Mcf

  3. JM Calk Operating, LLC6 leases

    3.01K bbl · 0 Mcf

  4. MDF Oil Company1 lease

    2.89K bbl · 0 Mcf

  5. Seeker Oil Company, Incorporated14 leases

    2.72K bbl · 0 Mcf

  6. Red Chalk Resources LLC4 leases

    2.46K bbl · 0 Mcf

  7. Calk, Roger D.17 leases

    2.29K bbl · 0 Mcf

  8. Old Chief Oil, LLC8 leases

    2.24K bbl · 0 Mcf

41 operators had production here in the twelve months. Each month is credited to the operator that reported it; ranked by barrels of oil equivalent, 6 Mcf to the barrel.

Every operator in Bexar County →

Largest leases

201 LEASES WITH PRODUCTION · 12 MONTHS THROUGH AUG 2026

LeaseOperatorFieldOil, 12 moGas, 12 mo
Hixon Properties, Inc.Oil 9000MDF Oil CompanyMonksfield (350 Sand)2,892 bbl0 Mcf
PyronOil 17019Red Chalk Resources LLCChicon Lake2,076 bbl0 Mcf
Erd UnitOil 17671JM Calk Operating, LLCFairfield1,309 bbl0 Mcf
LongOil 11972Old Chief Oil, LLCSomerset1,066 bbl0 Mcf
GarzaOil 18222JM Calk Operating, LLCFairfield932 bbl0 Mcf
Hayes, RichardOil 10869Drachen Oil CompanySomerset878 bbl0 Mcf
Barry -C-Oil 7249Mojave Resources, LLCFairfield860 bbl0 Mcf
BakerOil 11442Old Chief Oil, LLCSomerset790 bbl0 Mcf
MarpatOil 18821Production Resources, Inc.Somerset788 bbl0 Mcf
ErnstOil 11233Koko Skadi, LLCSomerset686 bbl0 Mcf
Mandujano, AlfonzoOil 11275Mandujano, Alfonso, Jr.Somerset669 bbl0 Mcf
Robertson, HarryOil 10774Koko Skadi, LLCSomerset625 bbl0 Mcf
Mauermann -B-Oil 8119South Sam Operating Company, LLCMonksfield (350 Sand)614 bbl0 Mcf
Kuenstler -A-Oil 11775Seeker Oil Company, IncorporatedSomerset561 bbl0 Mcf
Calk, E. W.Oil 10893Calk Operating, LLCSomerset555 bbl0 Mcf

Ranked by barrels of oil equivalent, 6 Mcf to the barrel. A lease in two counties is listed with its share in this one.

Every lease in Bexar County →

Wells by status

9,467 WELLBORES ON FILE

  1. Plugged

    4,780

  2. Not on schedule

    2,461

  3. Producing

    1,916

  4. No Production

    235

  5. Shut In

    39

  6. Spudded

    17

  7. Permitted

    8

  8. Injection

    4

From the RRC wellbore file and the permit record. Other sites count the RRC's map locations, which include dry holes and locations this file does not hold, so their totals differ.

Wells spudded, by year

HorizontalVertical and directional

02040602004200620082010201220142016201820202022

Drilling permits

Window30 days90 days180 days365 days
0
permits issued, 90d
-100%
vs prior 90d (1)
0
operators filing
—
horizontal
—
avg permitted depth, ft

WINDOWS ON THE RRC ISSUE DATE · COMPUTED NOV 12, 2026 · WHY ISSUE AND SEEN DATES DIFFER

Permits issued by month

LAST 120 MONTHS · BY ISSUE DATE

Last 12 months 8 · prior 12 1

0510152017201820192020202120222023202420252026

Operators by permits, last 12 months

By permits issued. Wells are the operator’s current inventory here from the RRC wellbore file.

OperatorPermitsWells
JM Calk Operating, LLC724
Enterprise Products Operatingllc10

Full operator directory: 437 operators have filed a permit here since 1977 →

New entrants, last 12 months

Operators whose first permit in Bexar County came in the last year. 1 in total.

Permit types, 90d

TypeWindowPriorAll time
Drill017,737

What the types mean →

Formations in completed wells

RRC WELLBORE FILE · ≥10 WELLS

Tops reported on completion filings for wells in Bexar County. A well counts for every formation it reports, so this reads as the county's stratigraphic column. About tops →

In Bexar County the Navarro is reported in 209 wells, median top 210 ft, highlighted below. Back to the formation →

FormationWellsPermitted last 3 yrsMedian top, ftP10–P90
Olmos1,30101,288834–1,501
Escondido9260530240–956
Anacacho57301,2001,038–1,449
Wilcox3550500200–550
Navarro2090210209–550
Austin Chalk3001,3981,050–2,902
Midway260210140–778
Buda1301,2971,180–1,844

Beyond the permit record

RRC UIC permits · H-10 reported volumes

Disposal and injection

9
active UIC permits of 350
4.03K
permitted bbl/day, active
7.98K
bbl injected, last 12 reported months
Sep 2025
reported through

Every active well, operator, and daily reporter in Bexar County →

Permitted volume is a ceiling, not throughput. How to read it →

USGS catalog, Texas

Seismicity, last 2 years

1
M2+ events in the area
M2.1
largest

Monthly counts, magnitudes, and every recent event in the area →

Events are not tagged with a county; this counts M2+ events inside the bounding box of the county’s located permits, padded 0.1°. About TexNet →

Latest permits

NEWEST FIRST BY ISSUE DATE

PermitSeenIssuedOperatorLease / wellDepthAPI
915977Jun 5, 2026Jun 5, 2026Enterprise Products OperatingllcCPS LID24-SA-110 #140002938406
913507Feb 19, 2026Feb 19, 2026JM Calk Operating, LLCErd Unit #151,50002938405
913506Feb 19, 2026Feb 19, 2026JM Calk Operating, LLCErd Unit #141,50002938404
913484Feb 18, 2026Feb 18, 2026JM Calk Operating, LLCErd Unit #131,50002938403
913198Feb 13, 2026Feb 13, 2026JM Calk Operating, LLCErd Unit #121,50002938402
912107Dec 15, 2025Dec 15, 2025JM Calk Operating, LLCErd Unit #81,50002938401
912106Dec 15, 2025Dec 15, 2025JM Calk Operating, LLCErd Unit #71,50002938400
912105Dec 15, 2025Dec 15, 2025JM Calk Operating, LLCErd Unit #61,50002938335
907616Apr 25, 2025Apr 25, 2025Alamo Environmental, Inc.Cassin #D 1941002936584
890265Jun 6, 2023Jun 6, 2023Nustar Logistics, L.P.NUSTAR1 #C 0144002938399

All Bexar County permits →

Questions about Bexar County

How many drilling permits were issued in Bexar County in the last 12 months?

8 permits were issued in Bexar County in the last 12 months, against 1 in the 12 months before. 0% were for horizontal wells. The most recent was issued Jun 5, 2026. 7,876 are on file since 1977.

Every Bexar County permit →

Who is the most active operator in Bexar County?

By drilling permits filed in the last 12 months, JM Calk Operating, LLC is the most active operator in Bexar County, with 7 of 8, followed by Enterprise Products Operatingllc (1). 0 operators filed permits here in the last 90 days.

Operators in Bexar County →

How many oil and gas wells are in Bexar County?

9,467 wells are on file in Bexar County, including 1,926 active, 4,781 plugged, and 8 permitted and not yet drilled. 10 are horizontal. The active wells are under 43 operators.

Every well in Bexar County →

How much oil and gas does Bexar County produce?

The Railroad Commission's county figures show 43,153 barrels of oil and 12 Mcf of gas in Bexar County in the 12 months through August 2026, from 201 leases under 41 operators. Texas operators report production by lease; where a lease lies in more than one county, the split between them is the RRC's.

Production by month in Bexar County →

Who are the largest producers in Bexar County?

By oil and gas produced in Bexar County in the 12 months through August 2026, the largest operator is Koko Skadi, LLC, with 5,670 barrels of oil and 0 Mcf of gas from 32 leases, followed by Drachen Oil Company and JM Calk Operating, LLC. 41 operators had production here in those months.

Operators in Bexar County →

How much water is injected in Bexar County?

7,983 barrels of water were injected in Bexar County in the 12 months through September 2025, reported on form H-10. 9 of the county's 350 disposal and injection permits are active.

Disposal and injection in Bexar County →

What formations are drilled in Bexar County?

Completion filings for wells in Bexar County report tops for 8 formations in at least ten wells each. The most reported are the Olmos (1,301 wells, median top 1,288 ft), the Escondido (926 wells, median top 530 ft), and the Anacacho (573 wells, median top 1,200 ft).

Formations in Bexar County →

What basin is Bexar County in?

Petrora lists Bexar County in the Eagle Ford Shale. It is in the Railroad Commission's District 01.

The Eagle Ford Shale →

Have there been earthquakes in Bexar County?

1 earthquake of magnitude 2 or more was located in the area of Bexar County's permitted wells in the last 2 years; the largest was M2.1.

Earthquakes in Bexar County →

About this data

Oil and gas are the Railroad Commission's county figures from its Production Data Query, through Aug 2026: Texas files production by lease, and where a lease lies in more than one county the split is the RRC's. Nothing here is estimated by Petrora. Wells from the RRC wellbore file and the permit record. Drilling permits from the RRC OGA049M master and daily daf420 files, rebuilt nightly into per-county figures; windows are on the date issued. Disposal from UIC permits and H-10 reports at the last settled month; earthquakes from the TexNet catalog inside the county's located-permit footprint.

Developers: this page as JSON is GET /v1/data/counties/tx/bexar?days=90, documented in the API reference.