Multistage hydraulic fracturing of horizontal wells is one of the effective technologies to improve the efficiency of geothermal exploitation,and fracture diagnosis is an important and challenging task in the optimal fracture design of geothermal reservoirs.However,for complex hydraulic fractures,pressure inversion procedure inevitably produces multiple solutions,which may lead to errors in production prediction and optimization design.In recent years,the application of distributed temperature sensors makes it possible to real-time monitor the wellbore temperature distribution.Theoretically,by using the monitored temperature data for transient analysis combined with the original pressure transient analysis,one degree of freedom and address the above problem of multiple solutions can be eliminated.Based on this,a coupled thermo-hydraulic coupling mathematical model for single-phase fluid production process of multistage fractured horizontal wells is established in this study.The equations are solved by numerical simulation,and the results of temperature and pressure evolution with time are obtained.Based on the calculation results,the pressure drop and heat transfer process are studied in detail in this study.It is found that the temperature variation at the junction of hydraulic fracture and wellbore is quite different from that at the non-junction.Therefore,the temperature transient analysis method can effectively identify the number and location of hydraulic fractures in the formation.At the same time,the pressure transient analysis method can obtain the length and permeability of hydraulic fracture.The above research shows that the integrated temperature-pressure transient analysis method can effectively improve the correctness of hydraulic fracture diagnosis.
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