The invention provides a
phase change fracturing method. The method includes the following steps that a
fracturing fluid is injected into a stratum to generate cracks in the stratum, and injection ofthe
fracturing fluid is stopped after the to-be-generated cracks reach preset requirements; a
phase change reaction liquid and a time
delay heat generating agent which can be subjected to a
phase change reaction at preset temperature are injected into the stratum; after injection of the
phase change material liquid is substantially completed, the time
delay heat generating agent exerts a heat generating action to make phase change of the
phase change material liquid to complete phase change fracturing. According to the provided technical scheme, since there is no
solid phase injection, not only can the friction resistance of tubular columns be effectively reduced, but also the happening time and progress of the phase change reaction can be effectively controlled due to the use of the delayheat generating agent, so that a better fracturing effect is achieved. Especially for low-temperature reservoirs, a
heat generation effect of the
delay heat generating agent greatly increases the rate of the phase change reaction so that the
phase change material liquid can rapidly form a
solid phase at a preset position, the phase change time is shortened, and the probability of successful construction is increased.