Exploitable Capacity of High Temperature Reservoir of Yang-Yi-xaing Geothermal Field of China

Abstract

Ying-Yi-Xiang high temperature geothermal filed is located in Tibet of China with the absolutely altitude of 4550-5050m.The general area is near 11km2.There are 28 exploring well have been drilled, total drilling depth is over 10000m.Lithological characteristic of the reservoir is fractured granite. The highest well head temperature is 207?C. Shut in well head pressure is 2.8-9.4 kg/cm2. Total flow rate of the whole well is 772- 8970t/d, with in the steam quantity of 82.2-2410t/d. Two well carried out injection test. 7 single wells carried out flowing test. One group well carried out interference well test. Long term reservoir well test with 4 wells lasted for 30 days. Using mass and heat transport model, fitting different measured data collected from geothermal filed, optimized parameters, planned 3 extraction scheme. Though calculation in large quantity, find specially curve for exploitable capacity. Final assessment and predict exploitable capacity of yiang-yi-xiang geothermal reservoir is 3.01x104t/d continuously developing for 30 years, controlling reservoir pressure draw down is 0.15x107pa.