HARPER, District 08, Texas

A field is the Railroad Commission's unit of geology and of regulation. Its spacing rule is what decides how many wells an acreage can hold.

Leases
69
with a page here
Operators
27
Value, all time
$350.0 M
63% of the register's 109
Discovered
1933-12-31
Oil

Our estimate: volumes the operator filed with the Commission, valued at the EIA first-purchase price for that month. It is not a payment anyone received, and it is not a royalty. It sums the 69 leases in this field that have a page here — 63% of the register's 109 — so it understates the field.

Production, 2025

The Railroad Commission's Oil and Gas Annual Report for 2025, its most recent. These are the state's figures for the whole field, not ours.

WellsIn the fieldProducingProduced in 2025Also producedCumulative
Oil42613682,605 bbl16,341 mcfcasinghead55,691,433 bblsince discovery

The discovery well's oil measured 37.0° API gravity, perforated at 4,300 ft.

Hydrogen sulphide

Spacing rule

What the Commission requires of a well on this field.

WellsRuleEffectiveFrom the lease lineBetween wellsAcres per unitMax diagonal
OilB330 ft660 ft100 ft

County

Leases in this field

Every lease here files this field's number with the Commission and has a page on this site.

LeaseOperatorValue
EAST HARPER UNITAGHORN OPERATING, INC.$123.5 M
MOSSWALSH & WATTS, INC.$31.1 M
PARKER -D-WALSH & WATTS, INC.$22.4 M
TXL -A-WALSH & WATTS, INC.$21.9 M
TXLBURLESON PETROLEUM, INC.$11.9 M
PARKER "A"WALSH & WATTS, INC.$10.9 M
PARKER, J. E.SHINNERY OIL COMPANY, INC.$8.6 M
PARKER "B"WALSH & WATTS, INC.$8.4 M
PARKER, J. E.ACOMA OPERATING, LLC$6.9 M
TXLWALSH & WATTS, INC.$6.6 M
W. E. COWDENBAKER OPERATING, INC.$6.4 M
ECTOR -AR- FEEPEN-TEX PRODUCTION CO. INC.$5.7 M
PARKERPEN-TEX PRODUCTION CO. INC.$5.4 M
PARKER "A"ACOMA OPERATING, LLC$4.6 M
ECTOR -AM- FEEAGHORN OPERATING, INC.$4.5 M
COWDEN, E. F. -A- - -B-AGHORN OPERATING, INC.$4.4 M
ECTOR -E- FEE /NCT-2/FORMENTERA OPERATIONS LLC$4.3 M
MOSS, PAUL -C-AGHORN OPERATING, INC.$4.3 M
MOSS, PAUL '34'AGHORN OPERATING, INC.$4.1 M
PARKER MINERALS 4CRESCENT ENERGY OPERATING, LLC$3.9 M
COWDEN-OLIVERBAKER OPERATING, INC.$3.3 M
PARKERACOMA OPERATING, LLC$3.2 M
ECTOR -T- FEEPEN-TEX PRODUCTION CO. INC.$3.0 M
TXL -B-WALSH & WATTS, INC.$3.0 M
FRASER, GEO. C. -B-BURLESON PETROLEUM, INC.$2.8 M
ECTOR -H- FEEFORMENTERA OPERATIONS LLC$2.3 M
PARKER MINERALS 16ACOMA OPERATING, LLC$2.2 M
PARKER, J. E. -A- /EO/FIVESTONES ENERGY LLC$2.2 M
PARKER, J. E. -B-PEN-TEX PRODUCTION CO. INC.$2.0 M
COWDEN -H-BAKER OPERATING, INC.$1.9 M
COWDEN, W. E.BAKER OPERATING, INC.$1.9 M
ECTOR -G- FEEPEN-TEX PRODUCTION CO. INC.$1.7 M
COWDENBAKER OPERATING, INC.$1.7 M
COWDEN, ELLIOTT F.AGHORN OPERATING, INC.$1.7 M
PARKER, J. E. -A-NICKI T OIL & GAS LLC$1.7 M
ECTOR -F- FEENICKI T OIL & GAS LLC$1.5 M
PHILLIPS-TXL-31-RUST OIL CORP.$1.4 M
COWDEN "B" BATTERY 2BAKER OPERATING, INC.$1.4 M
ARGO-MOSS -B-AGHORN OPERATING, INC.$1.2 M
MOSS, PAUL, ETAL -A-GRAY, W. H. OPERATING$1.2 M
COWDEN -A-PINNACLE MINING CORPORATION$1.2 M
PARKER MINERALS 9ACRESCENT ENERGY OPERATING, LLC$1.2 M
PARKER, J. E. -A-PEN-TEX PRODUCTION CO. INC.$945 k
ECTOR -E- FEE /NCT-1/FORMENTERA OPERATIONS LLC$918 k
PARKER, ET ALNICKI T OIL & GAS LLC$835 k
PARKER -B-CRESCENT ENERGY OPERATING, LLC$697 k
ECTOR -AN- FEENICKI T OIL & GAS LLC$647 k
PARKER MINERALS 9BCRESCENT ENERGY OPERATING, LLC$368 k
ARGO-MOSSAGHORN OPERATING, INC.$337 k
MOSS -C-DRAKE OIL & GAS, LLC$321 k
ECTOR -AP- FEEGARNER'S WELL SERVICE LLC$255 k
PARKERSHERIDAN PRODUCTION COMPANY, LLC$245 k
ECTOR -AO- FEEAGHORN OPERATING, INC.$233 k
FRASER, GEO. C. -A-WATER ENERGY SERVICES, LLC$113 k
SHELL-COWDENBENNETT, R. C., COMPANY$81 k
TXL-XHILCORP ENERGY COMPANY$75 k
FEE-10ACOMA OPERATING, LLC$73 k
COWDEN -C-JOHNSTON, DAVID MAHLON$69 k
CROSSBUSTAMANTE OIL COMPANY$58 k
PARKERALLEDER INC.$55 k
MOSS, PAUL ESTATERUST OIL CORP.$32 k
PARKER, J. E. -16-JOHNSTON, DAVID MAHLON$28 k
COWDEN, HARPERYUCCA ENERGY, INC.$17 k
W.E. COWDEN -B-BAKER OPERATING, INC.$15 k
PARKER, J. E.BINGHAM'S OIL & GAS$14 k
MOSS, PAUL -48-CHASE, MACK C.$13 k
COWDEN "E"YUCCA ENERGY, INC.$11 k
COWDENPINNACLE MINING CORPORATION$3 k
PARKER, J. E.BARNETT ENERGY, INC.$2 k

Field number 39176001, from the Railroad Commission's field register. The register's own index resolves 109 leases and 893 wells to this field by name, over every lease in Texas rather than only those with a page here. It resolves a lease by NAME and refuses an ambiguous one, so it counts nothing for a field that shares its name with another — which is why the lease count above comes from the field number instead.