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Subsurface System Design Issues and Approaches Chapter 5 between the wells will need to be established. Wells with a separation of 600 m and a good hydraulic link between the wells would show a breakthrough time for a tracer of about 4 to 6 days. The storage volume of the reservoir may increase to accommodate increased injection rates through the system. An initial starting step of 20 kg/s is considered reasonable and, if possible, the rate should be stepped up until the microseismicity suggests reservoir growth is taking place – which would suggest that about 2,600 m3 will be required to initiate a circulation test. Taking a worstcase scenario of losing 10% in the formation via leakoff, this will bring the figure up to 3,600 m3 for a threeweek circulation test. A separator, a heat exchanger, a heat load, and waterstorage facility will be required to implement this test. ix. Evaluateandrefractureorstimulatenearwellbore If the wellbore has skin damage (highpressure drop near the wellbore), the nearwellbore area is very susceptible to improvement. Acidizing, emplacing proppants, short highpressure stimulation, or other methods can help eliminate nearwellbore pressure drop. x. Longterm test circulation at or near commercial scale (about 50100 kg/s) No one has reached flow rates in the region of 70100 kg/s. This stage will depend on the result of the earlier circulation test. Evaluating the reservoir using pressure and temperature response, tracers, and microseismic data will help analysts understand what is happening in the reservoir and its surroundings. About 4,000 m3 would be required to charge the system. An acceptable worstcase scenario for water loss during circulation is 10%, which brings the figure up to 13,000 m3 for a threeweek test. 527PDF Image | Subsurface System Design Issues EGS vs. Hydrothermal Pool
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