SAND HILLS (MCKNIGHT), 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

153

with a page here

Operators

Value, all time

$2.11 bn

71% of the register's 215

Discovered

1944-12-31

Oil and gas

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 153 leases in this field that have a page here — 71% of the register's 215 — 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.

Wells	In the field	Producing	Produced in 2025	Also produced	Cumulative
Oil	762	341	3,815,448 bbl	7,486,904 mcfcasinghead	148,658,719 bblsince discovery
Gas	50	25	211,906 mcf	5,863 bblcondensate	159,068,269 mcfsince 1970

The discovery well's oil measured 35.2° API gravity, perforated at 3,420 ft.

Hydrogen sulphide

Spacing rule

What the Commission requires of a well on this field.

Wells	Rule	Effective	From the lease line	Acres per unit	Max diagonal
Gas	B	2024-12-17	330 ft	40	0 ft
Gas	O	2024-12-17	330 ft	10	99,999 ft
Oil	B	2024-12-17	330 ft	40	99,999 ft
Oil	O	2024-12-17	330 ft	10	99,999 ft

Commission remarks: ONLY. 6MONTH EXCEPTION TO SWR51A. SPECIAL HZ LANGUAGE

County

Crane County

Leases in this field

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

Lease	Operator	Value
WADDELL TR A	BLACKBEARD OPERATING, LLC	$1.33 bn
TUBB, J. B. A/C #1	FORMENTERA OPERATIONS LLC	$181.9 M
MCKNIGHT, M. B.	RING ENERGY, INC.	$83.6 M
MCKNIGHT SAND HILLS UNIT	BLACKBEARD OPERATING, LLC	$61.1 M
TUBB, J. B., -F-	FORMENTERA OPERATIONS LLC	$32.1 M
TUBB, J. B., -B-	FORMENTERA OPERATIONS LLC	$24.3 M
TUBB, J. B. -A-	RING ENERGY, INC.	$20.5 M
TUBB, J. B. -C-	FORMENTERA OPERATIONS LLC	$19.1 M
TUBB, J. B. -A- A/C #3	FORMENTERA OPERATIONS LLC	$17.3 M
TUBB-STATE, J.B.	BLACKBEARD OPERATING, LLC	$16.7 M
ATLANTIC STATE	MILLWEE OIL, INC.	$12.1 M
TUBB, J.B. 'B' A/C 2	FORMENTERA OPERATIONS LLC	$10.7 M
TUBB, J. B. -DK- A/C #1	FORMENTERA OPERATIONS LLC	$10.3 M
REIDLAND	MILLWEE OIL, INC.	$10.0 M
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$8.4 M
WADDELL TR CAB 7M	BLACKBEARD OPERATING, LLC	$7.8 M
TUBB, J. B. A/C #2	FORMENTERA OPERATIONS LLC	$7.6 M
MCKNIGHT, M. B. -C-	BURNETT OIL CO., INC.	$7.5 M
MCKNIGHT, M. B. -A-	BURNETT OIL CO., INC.	$7.2 M
TUBB, J. B. 'B' A/C 2	FORMENTERA OPERATIONS LLC	$7.1 M
WADDELL TR B	BLACKBEARD OPERATING, LLC	$7.0 M
MCKNIGHT, M. B.	HEIFER PRODUCTION COMPANY LLC	$6.7 M
MCKNIGHT, M. B. -B-	HEIFER PRODUCTION COMPANY LLC	$6.6 M
TUBB, J. B. "D" -A/C -2	LARIO OIL & GAS COMPANY	$6.0 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$6.0 M
TUBB, J. B.	LARIO OIL & GAS COMPANY	$5.9 M
JOHNSON-STATE	MILLWEE OIL, INC.	$5.8 M
MCKNIGHT, M. B. -A-	HEIFER PRODUCTION COMPANY LLC	$5.8 M
MCKNIGHT, M. B.	BURNETT OIL CO., INC.	$5.7 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$4.8 M
TUBB, J. B.	RING ENERGY, INC.	$4.7 M
MCKNIGHT, M. B. -B-	BURNETT OIL CO., INC.	$4.6 M
GULF TUBB	MILLWEE OIL, INC.	$4.4 M
REIDLAND & STATE	MILLWEE OIL, INC.	$4.3 M
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$4.2 M
TUBB -A-	MILLWEE OIL, INC.	$4.2 M
MCKNIGHT-CROLEY	BURNETT OIL CO., INC.	$4.2 M
MCKNIGHT, M. B. -D-	BURNETT OIL CO., INC.	$4.1 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$3.9 M
TUBB	MILLWEE OIL, INC.	$3.8 M
ES VEDRA	BLACKBEARD OPERATING, LLC	$3.7 M
BARNSLEY, M. L.	EXTEX OPERATING COMPANY	$3.6 M
TUBB, J. B. "C"	FORMENTERA OPERATIONS LLC	$3.3 M
WADDELL, W. N.	BLACKBEARD OPERATING, LLC	$3.3 M
REIDLAND-STATE	MILLWEE OIL, INC.	$3.1 M
MCKNIGHT "A"	BURNETT OIL CO., INC.	$3.1 M
TUBB, J. B. "A"	RING ENERGY, INC.	$3.0 M
BARNSLEY, M. L., "A"	VENTURE PRODUCTION SERVICE INC.	$3.0 M
JOHNSON STATE	MILLWEE OIL, INC.	$3.0 M
WADDELL TR AB 2M	BLACKBEARD OPERATING, LLC	$3.0 M
TUBB, J. B., -A-	MILLWEE OIL, INC.	$2.9 M
BARNSLEY, M. L. "A"	EXTEX OPERATING COMPANY	$2.8 M
MCKNIGHT, M. B.	FLAT TOP OPERATING, LLC	$2.7 M
WADDELL TR AB 1M	BLACKBEARD OPERATING, LLC	$2.7 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$2.6 M
TUBB, J. B. 'B' A/C 2	FORMENTERA OPERATIONS LLC	$2.6 M
TUBB, J. B. A/C 1	FORMENTERA OPERATIONS LLC	$2.6 M
TUBB, J. B., ETAL	RING ENERGY, INC.	$2.6 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$2.5 M
TUBB, J. B. D ACCT. #2	LARIO OIL & GAS COMPANY	$2.3 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$2.3 M
MCKNIGHT, M. B. -E-	BURNETT OIL CO., INC.	$2.3 M
TUBB, J. B. B TRACT "A"	CHEVRON U. S. A. INC.	$2.2 M
WADDELL, W. N. ET AL	BURLINGTON RES O & G CO-MIDLAND	$2.1 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$2.0 M
TUBB, J. B. "C" A/C 2	FORMENTERA OPERATIONS LLC	$2.0 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$2.0 M
WADDELL TR B	BLACKBEARD OPERATING, LLC	$1.9 M
BARNSLEY, M. L.	EXTEX OPERATING COMPANY	$1.8 M
TUBB, J. B. -B-	RING ENERGY, INC.	$1.7 M
TUBB, J. B. A/C #1	FORMENTERA OPERATIONS LLC	$1.7 M
WADDELL, W. N. ET AL	BURLINGTON RES O & G CO-MIDLAND	$1.7 M
TUBB, J.B. "B"	RING ENERGY, INC.	$1.7 M
TUBB, J.B. -B-	MILLWEE OIL, INC.	$1.6 M
WADDELL, W.N., ET AL TR. "C"	MERIDIAN OIL INC.-MIDLAND	$1.6 M
WADDELL, W. N. ET AL	BURLINGTON RES O & G CO-MIDLAND	$1.6 M
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$1.5 M
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$1.4 M
WADDELL TR B	BLACKBEARD OPERATING, LLC	$1.4 M
TUBB, J. B.	LARIO OIL & GAS COMPANY	$1.4 M
WADDELL, W. N. ET AL I	BURLINGTON RES O & G CO-MIDLAND	$1.4 M
BARNSLEY, M. L.	EXTEX OPERATING COMPANY	$1.4 M
BARNSLEY, M. L. "C"	VENTURE PRODUCTION SERVICE INC.	$1.3 M
WADDELL, W. M. ETAL	BURLINGTON RES O & G CO-MIDLAND	$1.3 M
WADDELL TR A	BLACKBEARD OPERATING, LLC	$1.3 M
TUBB, J.B. "AK" A/C 1	FORMENTERA OPERATIONS LLC	$1.3 M
BARNSLEY -B-	CITATION OIL & GAS CORP.	$1.3 M
TUBB -B-	MILLWEE OIL, INC.	$1.3 M
LEA, P. J., -C-	RICHLAND RESOURCES CORPORATION	$1.3 M
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$1.2 M
TUBB, J.B. "B" TR. A	WALSH & WATTS, INC.	$1.2 M
MCKNIGHT, M. B. -F-	BURNETT OIL CO., INC.	$1.1 M
WADDELL, W. N. ETAL	BURLINGTON RES O & G CO-MIDLAND	$1.1 M
BARNSLEY, M. L. "C"	VENTURE PRODUCTION SERVICE INC.	$1.1 M
TUBB, J. B. "A" TR. B	CHEVRON U. S. A. INC.	$1.1 M
LEA, P. J. -B-	FORMENTERA OPERATIONS LLC	$1.1 M
WADDELL TR C	BLACKBEARD OPERATING, LLC	$1.0 M
LEA, KATIE W. A/C 5	FORMENTERA OPERATIONS LLC	$1.0 M
BARNSLEY	SOUTHWEST ROYALTIES, INC.	$1.0 M
BARNSLEY -B-	CITATION OIL & GAS CORP.	$997 k
WADDELL, W. N. ETAL	BURLINGTON RES O & G CO-MIDLAND	$903 k
BARNSLEY, M.L.	VENTURE PRODUCTION SERVICE INC.	$890 k
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$860 k
TUBB, J.B. -A-	MILLWEE OIL, INC.	$817 k
BARNSLEY, M. L.	VENTURE PRODUCTION SERVICE INC.	$812 k
DELANGE	MILLWEE OIL, INC.	$804 k
BARNSLEY	SOUTHWEST ROYALTIES, INC.	$785 k
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$742 k
TUBB, J. B.	LARIO OIL & GAS COMPANY	$737 k
CONNELL ESTATE "C"	DSR OIL & GAS, INC.	$700 k
LEA, P. J. -B-	RICHLAND RESOURCES CORPORATION	$537 k
TUBB, J.B. -D-	LARIO OIL & GAS COMPANY	$524 k
BARNSLEY "D"	CITATION OIL & GAS CORP.	$503 k
WADDELL, W. N. ET AL	BURLINGTON RES O & G CO-MIDLAND	$484 k
LOU LEE	MARTIN, JIMMY INC	$457 k
LEA, P.J. A/C 2	FORMENTERA OPERATIONS LLC	$429 k
BARNSLEY -C-	BASIN WELL SERVICE OF ODESSA,INC	$420 k
LEA, P. J., -D-	RICHLAND RESOURCES CORPORATION	$416 k
TUBB, J. B. A	RING ENERGY, INC.	$378 k
LEA, P. J. A/C 2	FORMENTERA OPERATIONS LLC	$328 k
WADDELL TR I	BLACKBEARD OPERATING, LLC	$293 k
WADDELL, W. N. ET AL	BURLINGTON RES O & G CO-MIDLAND	$288 k
TUBB, J. B.	LARIO OIL & GAS COMPANY	$191 k
WADDELL, W. N. ETAL	BURLINGTON RES O & G CO-MIDLAND	$168 k
TUBB, J. B. -B-	RING ENERGY, INC.	$146 k
TUBB, J. B. "C"	EXXON MOBIL CORPORATION	$145 k
BARNSLEY, M. L. "A"	ANADARKO PETROLEUM CORPORATION	$78 k
TUBB, J. B. "A" TR. B	RING ENERGY, INC.	$78 k
BARNSLEY -D-	CITATION OIL & GAS CORP.	$52 k
TUBB, J.B. "EK"	FORMENTERA OPERATIONS LLC	$42 k
MCKNIGHT, M. B., -F-	DEVON ENERGY PRODUCTION CO, L.P.	$32 k
LEA, P. J. A/C 2	MOBIL PRODUCING TX. & N.M. INC.	$23 k
LEA, P. J. A/C 2	PURE RESOURCES, L.P.	$20 k
TUBB, J. B. "A" TR. B	CHEVRON U. S. A. INC.	$15 k
WADDELL TR E	BLACKBEARD OPERATING, LLC	$13 k
TUBB, J. B. -D-	LARIO OIL & GAS COMPANY	$12 k
LEA, P. J. A/C 2	MOBIL PRODUCING TX. & N.M. INC.	$11 k
LEA, P. J., -B-	MOBIL PRODUCING TX. & N.M. INC.	$7 k
BARNSLEY "D"	CITATION OIL & GAS CORP.	$6 k
TUBB, J. B. "C"	EXXON CORP.	$4 k
BARNSLEY, M. L. ETAL	CHEVRON U. S. A. INC.	$4 k
BARNSLEY "F"	CLARON CORPORATION	$3 k
TUBB, J. B. A/C 1	EXXON CORP.	$3 k
WADDELL, W. N. ET AL	SOUTHLAND ROYALTY CO.-MIDLAND	$2 k
BARNSLEY "C"	MARTIN, JIMMY INC	$2 k
BARNSLEY -B-	TOLA PRODUCTION COMPANY	$806
TUBB, J. B., A/C 1	EXXON CORP.	$151
TUBB, J. B. -B-	CHEVRON U. S. A. INC.	—
BARNSLEY, M. L.	ANADARKO PETROLEUM CORPORATION	—
TUBB, J. B. A/C-1	EXXON CORP.	—
TUBB, J. B. "A"	FINA OIL & CHEMICAL COMPANY	—
TUBB, J. B. A/C 1	EXXON CORP.	—
MCKNIGHT, M. B. -B-	MANNING, JACK	—

Field number 80473310, from the Railroad Commission's field register. The register's own index resolves 215 leases and 1,609 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.