GRANTHAM 13

Oil // district 10 // lease#41438

op: DIAMONDBACK E&P LLC

cum_oil

189k BBL

cum_gas

0 MCF

wells

5

production

2011-04 — 2026-03

peak_month

2012-10

-- production_history

cum_oil: 189,382 BBL cum_gas: 0 MCF

-- decline_curve_analysis

qi

2,239 BBL/mo

Di (annual)

15.1%

b-factor

0.0

EUR

178,365 BBL

R-squared

0.386

type

exponential

-- wells (5)

WELL#APIOPERATORPERMITSDEPTHLAST_ISSUED
4COBRA OIL & GAS CORPORATION212,0002014-02-11
3 ACOBRA OIL & GAS CORPORATION212,0002012-03-02
3COBRA OIL & GAS CORPORATION112,0002012-02-09
2COBRA OIL & GAS CORPORATION112,0002011-08-05
1COBRA OIL & GAS CORPORATION112,0002011-02-02
EOF // data source: Texas Railroad Commission // 2026