The need for numerical models to simulate geothermal pressure transients has been long recognised. In the last few years various studies have used the TOUGH2 reservoir simulator to model different well tests, in each case with a different model setup. Important features such as the skin effect and wellbore storage are incorporated differently or are sometimes not present. Rarely is the model se...

Production wells on deliverability are often used in modelling geothermal fields, especially for simulations of future scenarios. The mass flow rate is calculated by multiplying the productivity index by mobility and the difference between flowing bottom-hole pressure and the reservoir block pressure. Here three options are considered for calculating the bottom-hole pressure: (i) constant, (ii)...

Tracers are needed for the development of high-temperature geothermal resources. Several candidate tracers have been tested for that purpose in hydrothermal autoclaves at the Energy & Geoscience Institute in Salt Lake City, Utah. One gas tracer, SF6, and two of the two-phase tracers, the straightchain alcohols, were tested. They were tested at temperatures ranging from 220 to greater than 300C,...

The natural convection flow over a surface embedded in saturated porous media is encountered in many engineering problems such as the design of pebble-bed nuclear reactors, ceramic processing, crude oil drilling, geothermal energy conversion, use of fibrous material in the thermal insulation of buildings, catalytic reactors and compact heat exchangers, heat transfer from storage of agricultural...