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Review of EGS and Related Technology – Status and Achievements 4.4.2 Lessons learned at Rosemanowes Chapter 4 417 Figure 4.7 Major stimulation of Well RH15 at Rosemanowes in July 1985, 5,500m3 at up to 265 L/s (100 bbl/min), surface pressure of 16 MPa (2,320 psi). An experiment was also carried out in Phase 3A to shut off the section of the production borehole that had been shown to contain the outlet from the short circuit. A temporary packer assembly was installed close to the bottom of the borehole to seal off all the upper parts of the wellbore, and a production flow test was carried out to measure the flow rate from the lowflow zone at the bottom of the borehole under these conditions. The short circuit was sealed off, but a very low flow rate was obtained; and a further stimulation carried out from the bottom of the borehole gave no significant increase in flow. A subsequent interpretation of these results suggested that the most recently stimulated zone was parallel to, but largely unconnected with, the previously stimulated zone (Parker, 1989). This is a key observation in that it shows individual fractures at the well can have independent connections to the farfield fracture system, i.e., the natural fracture network is not wellconnected enough to form a commercialsize reservoir over short sections of a well. • The fractures created by hydraulic stimulation, which best connect across the reservoir, are not formed through tension, as in the hydraulic fracturing used in oil and gas wells. Instead, they are created by shearing on preexisting joint sets. • Stress fields in crystalline rock are invariably anisotropic, so the natural fractures fail in shear, long before jacking takes place. Having sheared, the natural fractures then selfprop and stay open. • It is possible to stimulate natural fractures and improve permeability – and create a connected volume of hot rock. • Too high an applied pressure results in runaway fracture growth, leading to water loss and/or short circuits.PDF Image | Review of EGS and Related Technology
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