Idaho Report Appendix B1 Raft River Injection Testing Recovery Curves

A Total Of Nine Injection-Backflow Tests Were Conducted On Well Rrgp5 At The Raft River Geothermal Site. Several Variables Can Be Altered During Huff Puff Testing To Aid In Characterization Of The Reservoir. These Variables Include: 1) Flow Rate, During Both Injection And Backflow; 2) Quiescence Time Between Injection And Backflow; 3) Chemical Character Of The Tracer Solution; 4) Temperature Of The Tracer Solution; And 5) Volume Of Tracer Solution Injected. Three Test Series Were Run. The Purpose Of Each Series Was To Examine The Effect Of A Given Variable On The Character Of The Recovery Curves. In The "2 Series" The Volume Of Solution Injected Was Varied. In The "4 Series" The Quiescence Time Was Varied And In The 115 Series" Both The Volume Of Solution And Quiescence Time, Were Varied. A Summary Of Each Test Is Listed In Table 1. For Each Test The Chemical Character Of The Tracer Solution Was Changed, Whereas The Flow Rates And Injection Temperatures Were Maintained At Approximately 150 Gal/Min And 122 Degrees C ( + 2), Respectively. The Purpose Of The "2 Series" Tests, In Which Injection Volume Was Varied, Was To Determine If The Reservoir Characteristics Changed With Increasing Distance From The Test Well. It Was Anticipated That Substantial Changes In The Permeability Of The Reservoir Being Tested Would Lead To Variations In The Degrees Of Mixing Between The Injected Solution And The Reservoir Water. These Differences Would Then Be Reflected In The Characteristics Of The Recovery Curve. This Series Includes Tests 2A-L, 2A-2, 2C And 20, With The Volume Of Solution Injected Into The Formation Ranging From 0 Liters (Well Bore Test Only) To 3.3 X 106 Liters. The Quiescence Time For Each Of These Tests Was 0 Hrs. Four Tests Were Run In The "4 Series", 4A, 46, 4C And 40. The Purpose Of This Series Was To Examine The Effect Of Local Groundwater Movement On The Injected Solution In The Near Well Bore Environment. The Volume Of Solution Injected Into The Formation During These Tests Was Relatively Small Varying From 0.61 X 104 To 1.1 X 104 Liters. The "5 Series" Consists Of A Single Test (5). Test 5 Was To Be A Breakthrough Test. Fluid Was Injected Into Rrgp5, While A Nearby Well, Rrgel, Was Back Flowed At 200 Gal/Min. Pressure Decreases In Rrgel, In Response To Production Of Rrgp5, Suggested A Reservoir Connection Between The Two Wells (Egandg, In Press). After 376 Hrs. Breakthrough Of Tracer From Rrgp5 To Rrgei Had Not Yet Been Achieved. At That Time Both Wells Were Shut In For 80 Hours To Conduct A Geophysical Survey (Sill; 1983), Then Rrgp5 Was Back Flowed At 150 Gal/Min. This Sequence Of Testing With An Injection Volume Of 1.3 X 107 Liters And 80 Hrs. Of Quiescence Allows Comparison With The "2 Series" And "4 Series" Of Tests All Having Lesser Injection Volumes And Quiescence Times. Egi Reference Number Gl04012

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Citation Date 1900-01-01T00:00:00

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Original ID 6D33344D70744BC7BF039413C1DC2459
Index Date 2014-06-17T11:58:03
Original Format ISO-USGIN
Original Version 1.2

Author

Name Regina M. Capuano
Email sbivens@egi.utah.edu

Geographic Extent

North Bound 49
South Bound 42
East Bound -111
West Bound -117.25