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 Surface Location
 API# 05-123-25567		Well Classification: OW Status: PR - 11/1/2025
Well Name/No:GUSTAFSON #31-21
(Click Well Name for Production Data)		Click Here for Transporter Gatherer Info
Operator:PRAIRIE OPERATING CO LLC - 10819
(Click Operator Name for Company Detail Report)		Federal Or State Lease #:
Facility Status:PRStatus Date11/1/2025
FacilityID:294850LocationID:309907
County:WELD #123Location:NENW 31 7N65W 6
Field:EATON - #19350Elevation:4827 ft.
Basin:DENVER (DJ) BASIN  
Planned Location:657FNL  2109 FWLLat/Long: 40.537200 / -104.708260Lat/Long Source: Field Measured
As Drilled Location:Footages Not AvailableLat/Long: 40.537190 / -104.708250Lat/Long Source: Field Measured
 Wellbore And Formation Details -- select either a wellbore Or formation to expand.
 

Wellbore #00             Wellbore Classification: OW             Status: PR - 11/1/2025             Measured TD: 7464 ft.

 Wellbore Data for Original WellboreWellbore Classification: OW        PR - 11/1/2025
Wellbore Permit
Permit #:20091059 Expiration Date:3/31/2010
Proposed Depth/Form:7500 ft.
Surface Mineral Owner Same:Yes
Mineral Owner:FEESurface Owner:FEE
Unit: Unit Number: 
Formation And Spacing:Code: NB-CD , Formation: NIOBRARA-CODELL , Order: , Unit Acreage: 80, Drill Unit: E2NW4
Wellbore Completed
Completion Date:2/12/2010
Spud Date:2/7/2010Spud Date Is:ACTUAL
Measured TD:7464 ft.Measured PB depth:7422 ft.
True Vertical TD:True Vertical PB depth:
Log Types:CIMO. DENSITY NEUTRON GR; DUAL IND LOG GR; CEMENT BOND VDL
Casing:String Type: SURF, Hole Size: 12.25 in., Size: 8.625 in., Top: 0 ft., Depth: 550 ft., Weight: , Citings Type: ACTUAL
Cement:Sacks: 270, Top: 0 ft., Bottom: 550 ft., Determination Method:
Casing:String Type: 1ST, Hole Size: 7.875 in., Size: 4.5 in., Top: 0 ft., Depth: 7438 ft., Weight: 11.6 , Citings Type: ACTUAL
Cement:Sacks: 470, Top: 3036 ft., Bottom: 7438 ft., Determination Method: CBL
FormationInterval TopLog BottomCoredDSTs
GREELEY SAND2910 ft.NN
PARKMAN3790 ft.NN
SUSSEX4505 ft.NN
NIOBRARA6991 ft.NN
FORT HAYS7243 ft.NN
CODELL7259 ft.NN

Formation CODL                     Formation Classification:  OW                     Status:  CM - 3/30/2010                 Interval Top: 7262 ft.    Interval Bottom: 7276 ft.

 Completed Information for Formation CODELL
1st Production Date:3/9/2010Choke Size:0.219 in.
Formation Name:CODELLCommingled:No
Production Method:
Open Hole Completion:No
Formation Treatment
Treatment Date:2/22/2010
Treatment Summary:FRAC CODELL WITH 4121 BBLS SLICKWATER AND 115,000# 30/50 SAND. SPEARHEAD 500 BBLS 7% KCL AHEAD OF FRAC. TREAT AT AN AVERAGE OF 5666 PSI 60.7BPM. MAX PRESSURE 6479PSI. MAX RATE 62.8BPM
Tubing Size:Tubing Setting Depth:
Tubing Packer Depth:Tubing Multiple Packer:
Open Hole Top:Open Hole Bottom:
Initial Test Data:
Test Date:3/30/2010Test Method:FLOWING
Hours Tested:24Gas Type:WET
Gas Disposal:SOLD
Test TypeMeasure
BBLS_H2O 1
BBLS_OIL 60
BTU_GAS 1242
CALC_GOR 1667
CASING_PRESS 200
GRAVITY_OIL 47
MCF_GAS 100
Perforation Data:
Interval Top:7262 ft.# Of Holes:56
Interval Bottom:7276 ft.Hole Size:0.38 in.

Formation NB-CD                   Formation Classification:  OW                   Status:  PR - 11/1/2025                 Interval Top: 7000 ft.    Interval Bottom: 7276 ft.

 Completed Information for Formation NIOBRARA-CODELL
1st Production Date:1/17/2011Choke Size: 
Formation Name:NIOBRARA-CODELLCommingled:Yes
Production Method:
Open Hole Completion:
Tubing Size:2.375 in.Tubing Setting Depth:7251 ft.
Tubing Packer Depth:Tubing Multiple Packer:
Open Hole Top:Open Hole Bottom:
Initial Test Data:
Test Date:1/27/2011Test Method:FLOWING
Hours Tested:24Gas Type:SHALE
Gas Disposal:SOLD
Test TypeMeasure
BBLS_H2O 4
BBLS_OIL 35
BTU_GAS 1242
CALC_GOR 1429
CASING_PRESS 1100
GRAVITY_OIL 50
MCF_GAS 50
TUBING_PRESS 850
Perforation Data:
Interval Top:7000 ft.# Of Holes:188
Interval Bottom:7276 ft.Hole Size:

Formation NBRR                     Formation Classification:  OW                     Status:  CM - 12/11/2010                Interval Top: 7000 ft.    Interval Bottom: 7202 ft.

 Completed Information for Formation NIOBRARA
1st Production Date:11/22/2010Choke Size: 
Formation Name:NIOBRARACommingled:
Production Method:
Open Hole Completion:
Formation Treatment
Treatment Date:11/20/2010
Treatment Summary:FRAC NIOBRARA WITH 4156 BBLS DYNAFLOW 2 WR FLUID; 238,000# 30/50 SAND; AND 12,000# 20/40 RESIN COATED SAND. SPEARHEAD 24 BBLS 15% ACID AHEAD OF FRAC AND 500 BBLS 7% KCL IN PRE-PAD. TREAT AT AN AVERAGE OF 5416PSI 63.4 BPM MAX PRESSURE 6183 PSI MAX RATE 64.2 BPM
Tubing Size:Tubing Setting Depth:
Tubing Packer Depth:Tubing Multiple Packer:
Open Hole Top:Open Hole Bottom:
Initial Test Data:
Test Date:12/11/2010Test Method:FLOWING
Hours Tested:24Gas Type:SHALE
Gas Disposal:SOLD
Test TypeMeasure
BBLS_H2O 2
BBLS_OIL 44
BTU_GAS 1242
CALC_GOR 455
CASING_PRESS 200
GRAVITY_OIL 43
MCF_GAS 20
Perforation Data:
Interval Top:7000 ft.# Of Holes:132
Interval Bottom:7202 ft.Hole Size:0.38 in.
Primary Well Designation:
Low Producing      i
            All DesignationsDate
Reported PluggedN 
Out Of Service RepurposedN 
Out Of ServiceN 
Inactive ExceptionN 
Noticed InactiveN 
Defined InactiveN 
Low ProducingYProduction Period
02/2025 - 01/2026

BOE/MCFE/GOR Calculations
Production for Previous 12 Months
February 2025 - January 2026i
Total Oil Produced (Barrels)141
Total Gas Produced (MCF)137
GOR971
GOR DeterminationBOE
Average BOE per Day0.447
Average MCFE per Day2.600

 Federal Financial Assurance  i Y

 Tribal Well  i No