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493 Matching Results
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Tracer Developments: Results of Experimental Studies
Tracers can be used to monitor the movement of groundwaters and geothermal fluids and they can be used as a reference to quantify changes in fluid chemistry as a result of injection. Despite their potential importance to the geothermal operator, very few tracers are presently available and of those that are, little is known about their stability or behavior at the elevated temperatures that typify resources capable of electric power generation. During the past two years the University of Utah Research Institute has been involved in tracer research and testing, largely through the DOE Injection Research Program. The purpose of this paper is to summarize the results of these laboratory and field investigations.
Date:
January 21, 1986
Creator:
Adams, M. C.; Ahn, J. H.; Bentley, H.; Moore, J. N. & Veggeberg, S.
Object Type:
Article
System:
The UNT Digital Library
The Paducah Post (Paducah, Tex.), Vol. 80, No. 26, Ed. 1 Thursday, August 21, 1986
Weekly newspaper from Paducah, Texas that includes local, state, and national news along with advertising.
Date:
August 21, 1986
Creator:
Adams, Patty
Object Type:
Newspaper
System:
The Portal to Texas History
Geothermal Two-Phase Wellbore Flow: Pressure Drop Correlations and Flow Pattern Transitions
In this paper we present some basic concepts of two-phase flow and review the Orkiszewski (1967) correlations which have been suggested by various investigators to perform well for geothermal wellbore flow situations. We also present a flow regime map based on the transition criteria used by Orkiszewski (1967) and show that most geothermal wells flow under slug flow regime. We have rearranged bubble- to slug-flow transition criterion used by Orkiszewski (1967) to show that the transition depends on the dimensionless pipe diameter number in addition to dimensionless liquid and gas velocity numbers. Our aim is also to identify what research may lead to improvements in two-phase pressure drop calculations for geothermal wellbore flow.
Date:
January 21, 1986
Creator:
Ambastha, A. K. & Gudmundsson, J. S.
Object Type:
Article
System:
The UNT Digital Library
Pressure Profiles in Two-Phase Geothermal Wells: Comparison of Field Data and Model Calculations
Increased confidence in the predictive power of two-phase correlations is a vital part of wellbore deliverability and deposition studies for geothermal wells. Previously, the Orkiszewski (1967) set of correlations has been recommended by many investigators to analyze geothermal wellbore performance. In this study, we use measured flowing pressure profile data from ten geothermal wells around the world, covering a wide range of flowrate, fluid enthalpy, wellhead pressure and well depth. We compare measured and calculated pressure profiles using the Orkiszewski (1967) correlations.
Date:
January 21, 1986
Creator:
Ambastha, A. K. & Gudmundsson, J. S.
Object Type:
Article
System:
The UNT Digital Library
Reservoir Behaviour in a Stimulated Hot Dry Rock System
Research into the stimulation of hot dry rock (HDR) systems in crystalline rock has been underway in Cornwall, England for several years. Two deviated wells were drilled to a depth of 2100 m in 1981 with an interwell separation of 300 m. These wells were connected by massive hydraulic injections using water, but the interconnection was insufficient to permit long term circulation without excessive water losses. In 1985 a third well was drilled to a depth of 2600 m in a direction chosen from the analysis of the reservoir behavior during the previous circulation. A massive stimulation (200 l/s, 75 bbl/min) of gel was used to connect the wells and circulation was re-established in August 1985. Reservoir models have been developed from hydraulic analyses, thermal behavior, microseismic mapping, tracer dispersion and chemical modeling. The system behaves like an interconnected network of flow paths with a few dominant routes acting as flow conduits. The storage is associated with pressure dependent joint compliance, but it is isolated from the dominant flow paths. No unique physical model has yet been derived but the various techniques have been used to establish constraints on the geometry and nature of the heat transfer regions. The experiments …
Date:
January 21, 1986
Creator:
Batchelor, Anthony S.
Object Type:
Article
System:
The UNT Digital Library
Rains County Leader (Emory, Tex.), Vol. 99, No. 12, Ed. 1 Thursday, August 21, 1986
Weekly newspaper from Emory, Texas that includes local, state, and national news along with advertising.
Date:
August 21, 1986
Creator:
Becknell, Kathleen Hill
Object Type:
Newspaper
System:
The Portal to Texas History
Linear induction accelerator parameter options
The principal undertaking of the Beam Research Program over the past decade has been the investigation of propagating intense self-focused beams. Recently, the major activity of the program has shifted toward the investigation of converting high quality electron beams directly to laser radiation. During the early years of the program, accelerator development was directed toward the generation of very high current (>10 kA), high energy beams (>50 MeV). In its new mission, the program has shifted the emphasis toward the production of lower current beams (>3 kA) with high brightness (>10/sup 6/ A/(rad-cm)/sup 2/) at very high average power levels. In efforts to produce these intense beams, the state of the art of linear induction accelerators (LIA) has been advanced to the point of satisfying not only the current requirements but also future national needs.
Date:
April 21, 1986
Creator:
Birx, D.L.; Caporaso, G.J. & Reginato, L.L.
Object Type:
Report
System:
The UNT Digital Library
Cooling of the Wairakei Reservoir During Production
After nearly 30 years of power generation, parts of the present production area at Wairakei are near the end of their economic life due to local cooling. To the west of the present production area there remains a large volume of high temperature resource whose deep liquid temperatures have not changed from those measured during the 1960's. Power generation can be maintained for many more years by producing from this high temperature resource.
Date:
January 21, 1986
Creator:
Bixley, Paul F.
Object Type:
Article
System:
The UNT Digital Library
The Colony Courier (The Colony, Tex.), Vol. 11, No. 1, Ed. 1 Thursday, August 21, 1986
Weekly newspaper from The Colony, Texas that includes local news along with advertising.
Date:
August 21, 1986
Creator:
Blalock, Jack
Object Type:
Newspaper
System:
The Portal to Texas History
Natural State Model of the Nesjavellir Geothermal Field, Iceland
The Nesjavellir geothermal system in southern Iceland is very complex from both a thermal and hydrologic point of view. There are large pressure and temperature gradients in the wellfield and zones with drastically different pressure potentials. Thus, natural fluid flow is substantial in the system and flow patterns are complex. We have developed a two-dimensional natural state model for the Nesjavellir system that matches reasonably well the observed pressure and temperature distributions. The match with field data has allowed determination of the energy recharge to the system and the permeability distribution. Fluids recharge the system at rate of 0.02 kg/s/m with an enthalpy of 1460 kJ/kg. The permeability in the main reservoir is estimated to be in the range of 1.5 to 2.0 md, which agrees well with injection test results from individual wells. Permeabilities in shallower reservoirs are about an order of magnitude higher. Most of the main reservoir is under twephase conditions, as are shallow aquifers in the southern part of the field. The model results also suggest that the low temperatures in the shallow part of the northern region of the field may be due to the young age of the system; i.e., the system is gradually …
Date:
January 21, 1986
Creator:
Bodvarsson, G. S.; Pruess, K.; Stefansson, V.; Steingrimsson, B.; Bjornsson, S.; Gunnarsson, A. et al.
Object Type:
Article
System:
The UNT Digital Library
The Goldthwaite Eagle (Goldthwaite, Tex.), Vol. 93, No. 15, Ed. 1 Thursday, August 21, 1986
Weekly newspaper from Goldthwaite, Texas that includes local, state, and national news along with extensive advertising.
Date:
August 21, 1986
Creator:
Bridges, G. Frank
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 69, Ed. 1 Tuesday, January 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
January 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 96, Ed. 1 Friday, February 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
February 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 120, Ed. 1 Friday, March 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
March 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 146, Ed. 1 Monday, April 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
April 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 172, Ed. 1 Wednesday, May 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
May 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 224, Ed. 1 Monday, July 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
July 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 251, Ed. 1 Thursday, August 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
August 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 277, Ed. 1 Sunday, September 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
September 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 64, No. 303, Ed. 1 Tuesday, October 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
October 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 65, No. 18, Ed. 1 Friday, November 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
November 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Baytown Sun (Baytown, Tex.), Vol. 65, No. 43, Ed. 1 Sunday, December 21, 1986
Daily newspaper from Baytown, Texas that includes local, state, and national news along with advertising.
Date:
December 21, 1986
Creator:
Brown, Leon
Object Type:
Newspaper
System:
The Portal to Texas History
The Llano News (Llano, Tex.), Vol. 95, No. 43, Ed. 1 Thursday, August 21, 1986
Weekly newspaper from Llano, Texas that includes local, state, and national news along with advertising.
Date:
August 21, 1986
Creator:
Buckner, Walter L.
Object Type:
Newspaper
System:
The Portal to Texas History
Customized Well Test Methods for a Non-Customary Geothermal Well
Recent testing of Thermal 4, The Geysers blowout well, has shown that the flow has two different components: a low enthalpy, mineral-laden flow from a well drilled within the existing wellhead and a high flowrate, high enthalpy annular flow. The commingled flows were mechanically separated and individually tested. The results of the test show that the flows are from two very different sources that are in weak hydraulic communication. Work is in progress to apply this information to bring Thermal 4 within compliance of the 1986 air quality regulations.
Date:
January 21, 1986
Creator:
Burr, Myron
Object Type:
Article
System:
The UNT Digital Library