MCDONALD -29- UNIT

Oil // district 10 // lease#11712

op: VANGUARD OPERATING, LLC

fields: WARD, SOUTH

cum_oil

204k BBL

cum_gas

0 MCF

wells

37

production

1993-01 — 2026-03

peak_month

1999-12

-- production_history

cum_oil: 204,490 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

1,325 BBL/mo

Di (annual)

13.7%

b-factor

0.2

EUR

140,856 BBL

R-squared

0.655

type

hyperbolic

-- wells (37)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
401STANOLIND OPERATING CORP.13,1502008-02-11
513THREE-B OIL COMPANY, THE13,0001983-05-09
45THREE-B OIL COMPANY, THE13,0001982-08-20
512THREE-B OIL COMPANY, THE13,0001982-02-11
511THREE-B OIL COMPANY, THE13,2001981-06-30
207THREE-B OIL COMPANY, THE13,2001980-03-05
305THREE-B OIL COMPANY, THE13,2001979-12-03
206THREE-B OIL COMPANY, THE23,0001979-08-06
510THREE-B OIL COMPANY, THE12,4001978-02-10
509THREE-B OIL COMPANY, THE12,4001977-06-20
10142-475-00057--------
102W42-475-00056--------
10342-475-81653--------
10442-475-00054--------
105W42-475-00053--------
10642-475-00058--------
10742-475-00059--------
108W42-475-00060--------
10942-475-00061--------
11042-475-81658--------
112W42-475-00063--------
11342-475-30787--------
201A42-475-00065--------
20242-475-00798--------
203W42-475-00797--------
20542-475-00066--------
30142-475-03550--------
302W42-475-03551--------
30342-475-03048--------
30442-475-30758--------
40242-475-00801--------
403W42-475-00067--------
40442-475-30785--------
50442-475-00068--------
505W42-475-04059--------
507W42-475-05148--------
50842-475-00069--------
EOF // data source: Texas Railroad Commission // 2026