Apparatus and technique for simulating the propagation of shale fractures under high temperature convective heat

An apparatus for simulating the propagation of shale fractures under high temperature convective heat, comprising:

• a data collecting and processing system (1);
• a high-temperature thermal fluid generator (3) comprising a fluid generator (6), a temperature controller (5), and a pressure controller (4), wherein an output end of the temperature controller (5) and an output end of the pressure controller (4) are electrically connected to an input end of the fluid generator (6);
• a high-pressure pumping device (11) comprising a high-pressure constant-speed injection pump (12) and a high-pressure constant-speed injection pump controller (10), wherein an output end of the high-pressure constant-speed injection pump controller (10) is electrically connected to an input end of the high-pressure constant-speed injection pump (12), and wherein an output end of the data collecting and processing system is electrically coupled to an input end of the high-pressure constant-speed injection pump controller (10);
• and
• a shale reaction kettle (23) comprising a reaction kettle outer chamber (37), a reaction kettle outer cavity cover (20), a rock sealed cavity (33), and a shale sample (32), wherein the reaction kettle outer cavity cover (20) is positioned atop the reaction kettle outer chamber (37), the rock sealed cavity (33) is embedded in the reaction kettle outer chamber (37), the shale sample (32) is positioned within the rock sealed cavity (33), an inner net size of the rock sealed cavity (33) is the same as an external size of the shale sample (32), a reaction kettle inner cavity cover (21) is positioned over the rock sealed cavity (33), fastening bolts (22) are positioned atop the reaction kettle inner cavity cover (21) and screwed to a top of the rock sealed cavity (33), a reaction kettle base (38) is provided at a bottom of the reaction kettle outer chamber (37), a simulated wellbore (19) is placed on the reaction kettle outer cavity cover (20), a bottom end of the simulated wellbore (19) extends through the reaction kettle inner cavity cover (21) to the shale sample (32), and a top of the simulated wellbore (19) communicates with the high-pressure constant-speed injection pump (12).