The stress field response of the geothermal reservoir induced by staged fracturing will have a direct impact on the wellbore integrity and casing deformation of the geothermal reservoir. Studying the stress field response of the geothermal reservoir induced by staged fracturing is important to guide the field fracturing. significance. At present

fracture mechanics is generally used to solve the stress field response induced by hydraulic fracturing. However

the stress field response of geothermal reservoirs induced by staged fracturi

ng is essentially the problem of stress interference between fractures under the action of heat-fluid-solid coupling

which makes this problem difficult to solve. Fracture mechanics solutions are extremely complex. In view of this

the continuity assumption was introduced to transform this fracture mechanics problem into an elastic mechanics problem

and a single-connected analytical model of the stress field response of geothermal reservoirs induced by staged fracturing was established

which greatly reduced the difficulty of solving

and the stress field response after field fracturing can be analyzed more simply and effectively. Based on ABAQUS

a staged fracturing thermal-fluid-solid coupling numerical model for geothermal reservoirs was established

and the error of the analytical model was verified to be within 5 % by comparing the average stress in the

x

and

y

directions. Then

using the analytical model

the effects of cluster number

temperature difference and natural fractures on the stress field of geothermal reservoirs are discussed. The results show that as the number of clusters increases

the stress component in the

x

-direction increases and the stress component in the

y

-direction decreases in the geothermal reservoir; as the temperature difference increases

the stress components in the

x

and

y

directions in the geothermal reservoir increase accordingly; as the density of natural fractures increases

the stress component in the

x

-direction increases and the stress component in the

y

-direction decreases in the geothermal reservoir.