The Rosemanowes HDR project 1983–1991

The measured shallow temperature field in Britain

“…High temperatures were confirmed by the Eastgate borehole (Manning et al, 2007) drilled only a few kilometres from Rookhope which reported a BHT of 46.2 °C at a depth of 995 m (compared to 40.4 °C at a depth of 806 m at Rookhope). Elevated temperatures are also known in Cornwall from the Rosemanowes HDR project where a BHT of 79 °C was recorded at a depth of 2 km in the Carnmenellis granite (Parker, 1999 …”

Stress magnitudes across UK regions: New analysis and legacy data across potentially prospective unconventional resource areas

“…Hydraulic fracturing has been used to determine the magnitude of S HMax for a number of sites across the UK including: Morley Quarry, Rosemanowes Quarry and the Wray borehole (Evans, 1987;Parker, 1999;Heidbach et al, 2016). This method was also utilised by the coal industry for a number of boreholes drilled across the UK between 1980 and 1992.…”

“…1 shows the 24 borehole sites for which stress magnitude information is available from the WSM (Heidbach et al, 2016) and also the technique from which the stress magnitude was derived, either by over-coring (Bigby et al, 1992) or hydraulic fracturing. The majority of this information was collected between 1982 and 1997, by the National Coal Board, site characterisation records from the previously proposed nuclear waste repository at Sellafield (Nirex, 1997), or from research projects such as the Hot Dry Rock Project (Parker, 1999). Since these projects there has been comparatively little work on the magnitude of the principle stresses at depth onshore in the UK.…”

Role of Stress-controlled Flow Pathways in HDR Geothermal Reservoirs

“…Characteristics of these sites are summarized in Table 1, where the recovery rate is defined as the ratio of the amount of water pumped down injection wells to that of heated water reemerging up production wells. It has been reported that the recovery rate in Rosemanowes decreased in the case that the injection pressure at wellhead exceeded about 10 MPa (PARKER, 1999). The recovery rate in Soultz is unknown, since a downhole pump was used to extract heated water from the subsurface.…”