DUSEK 4

Oil · District 7C · Lease #17817

Operator: PIONEER NATURAL RES. USA, INC.

Cum Oil

627k BBL

Cum Gas

4.2M MCF

casinghead

Wells

9

Production

2012-02 — 2026-02

Peak Month

2013-08

Production History

Cum Oil: 626,556 BBL Cum Gas: 4,182,068 MCF

RRC production reported through Apr 2026 · recent months incomplete

Decline Curve Analysis

qi

16,379 BBL/mo

Di (annual)

34.4%

b-factor

0.0

EUR

571,424 BBL

R-squared

0.816

type

exponential

Operator History (from monthly production reports)

2021-02 — 2026-07 PIONEER NATURAL RES. USA, INC. 66 mo
2012-02 — 2021-01 PARSLEY ENERGY OPERATIONS, LLC 108 mo

Wells (9)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
11PIONEER NATURAL RES. USA INC.113,0002012-10-31
12PIONEER NATURAL RES. USA INC.113,0002012-10-31
7PIONEER NATURAL RES. USA INC.113,0002012-10-23
8PIONEER NATURAL RES. USA INC.213,0002012-09-17
6PIONEER NATURAL RES. USA INC.114,0002012-03-01
1PIONEER NATURAL RES. USA INC.113,0002012-01-20
5PIONEER NATURAL RES. USA INC.213,0002012-01-20
4PIONEER NATURAL RES. USA INC.113,0002012-01-18
3PIONEER NATURAL RES. USA INC.112,0002011-11-04