UNIVERSITY -36-

Oil · District 08 · Lease #17838

Operator: UNION OIL COMPANY OF CALIFORNIA

Fields: EMMA (ELLENBURGER)

Cum Oil

393k BBL

Cum Gas

455k MCF

casinghead

Wells

7

Production

1993-01 — 2012-05

Peak Month

1994-01

Production History

Cum Oil: 393,046 BBL Cum Gas: 454,625 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

9,328 BBL/mo

Di (annual)

28.0%

b-factor

0.0

EUR

400,188 BBL

R-squared

0.805

type

exponential

Operator History (from monthly production reports)

2025-04 — 2026-07 RING ENERGY, INC. 16 mo

2018-12 — 2025-03 LIME ROCK RESOURCES IV-A, L.P. 76 mo

2016-01 — 2018-11 GREYSTONE PETROLEUM, LLC 35 mo

2011-01 — 2015-12 GREYSTONE OIL & GAS, LLP 60 mo

2006-04 — 2010-12 CHEVRON MIDCONTINENT, L.P. 57 mo

2000-06 — 2006-03 PURE RESOURCES, L.P. 70 mo

1993-01 — 2000-05 UNION OIL COMPANY OF CALIFORNIA 89 mo

Wells (7)

WELL#	API	OPERATOR	PERMITS	DEPTH	LAST_ISSUED
2	42-003-06547	WTG EXPLORATION	2	12,000	2013-02-21
6	42-003-06550	RING ENERGY, INC.	1	12,815	2003-04-10
1	42-003-06527	RING ENERGY, INC.	1	12,636	2002-01-24
7	42-003-06567	RING ENERGY, INC.	1	12,768	2002-01-17
3	42-003-06613	RING ENERGY, INC.	1	12,665	2001-11-06
4	42-003-06577	RING ENERGY INC.	--	--	--
5	42-003-06529	RING ENERGY INC.	--	--	--