Author: Y. C. HsuPublisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 31
Book Description
Enhanced Heat Extraction from Hot-dry-rock Geothermal Reservoirs Due to Interacting Secondary Thermal Cracks
Author: Y. C. HsuPublisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 31
Book Description
Enhanced Heat Extraction from Hot-dry-rock Geothermal Reservoirs Due to Interacting Secondary Thermal Cracks. Final Report
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
How the fluid circulating through the main hydraulic fracture and the thermally-induced secondary, growing, interacting cracks affects the time-varying temperature, deformations, stresses, thermal crack geometry, water flow rates through the main and thermal cracks, reservoir coolant outlet temperature, and reservoir thermal power of the cracked geothermal reservoir is investigated. First, a simplified version of the proposed hot-dry-rock reservoir is considered. A closed-form solution of the rock temperature without thermal crack was found and substituted into SAP-IV computer code to calculate the stresses. These stresses being superposed with earth stresses and fluid pressure were used in conjunction with the fracture mechanics criterion to determine the initiation of secondary thermal crack. After the initiation of secondary thermal crack, the rock temperature was then calculated by a two-dimensional heat conduction program AYER. The detailed procedures for carrying out these steps are listed. Solutions developed are applied to studying the time-varying temperature field, thermal stresses and crack geometry produced, and additional heat power generated in the reservoir. Conclusions were discussed and summarized. (MHR).
Final Report to Los Alamos Scientific Laboratory on Enhanced Heat Extraction from Hot-dry-rock Geothermal Reservoirs Due to Interacting Secondary Thermal Cracks
Author: Y. C. HsuPublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 62
Book Description
Engineering Methods for Predicting Productivity and Longevity of Hot-dry-rock Geothermal Reservoir in the Presence of Thermal Cracks. Technical Completion Report
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Additional heat extraction from geothermal energy reservioirs depends on the feasibility to extend the main, hydraulic fracture through secondary thermal cracks of the adjacent hot rock. When the main, hydraulic fracture is cooled sufficiently, these secondary thermal cracks are produced normal to the main fracture surface. As such, both the heat transfer surface area and heat energy available to the fluid circulating through the main, hydraulic fracture system increase. Methods for predicting the productivity and longevity of a geothermal reservoir were developed. A question is whether a significant long-term enhancement of the heat extraction process is achieved due to these secondary thermal cracks. In short, the objectives of this investigation are to study how the main, hydraulic fracture can be extended through these secondary thermal cracks of the rock, and to develop methods for predicting the productivity and longevity of a geothermal reservoir.
Geothermal Energy Update
Author: Publisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 364
Book Description
Energy Research Abstracts
Author: Potential for Hot-dry-rock Geothermal Resources
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Hot dry rock (HDR) contains insufficient permeability and fluid for natural hydrothermal development, but water pumped in a circulation loop through a HDR reservoir (hydraulically fractured between two drill holes) is being tested and evaluated. The formation of such in situ heat transfer systems, and subsequent testing of the man-made geothermal reservoirs in the Jemez volcanic field, New Mexico have already indicated the technical feasibility of the hot dry rock (HDR) geothermal concept. Documented production history and heat-extraction data obtained during the period from 1978 to 1980 have confirmed heat transfer, low water loss, and predictable thermal drawdown models for the HDR systems. During a nine month test of closed-loop heat extraction operations, 15 x 106 kWh of thermal energy were produced. The effective heat-transfer area and volume of the reservoir increased due to secondary fracturing caused by thermal contraction of the reservoir rock, and sustained pressurization. Drilling, fracturing, and testing of a larger, hotter reservoir system is now underway on a HDR geothermal reservoir of commercial size.
Autograph Letters Signed from Sydney Grundy to Augustin Daly
Author: Thermal Stress Cracking and the Enhancement of Heat Extraction from Fractured Geothermal Reservoirs
Author: Hugh D. MurphyPublisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 17
Book Description
Geothermal Energy
Author: United States. Dept. of Energy. Division of Geothermal EnergyPublisher:
ISBN:
Category : Geothermal engineering
Languages : en
Pages : 634
Book Description