Research on Preparation Technology of Temperature-Controlled Expansion Plugging Agent Based on Shape Memory Polymer

A kind of temperature-controlled expansion plugging agent based on temperature-triggered shape-memory material is prepared to achieve expansion bridging in fractured stratum after the temperature reaches the excitation temperature point. This paper discusses the preparation technology of the temperature-controlled expansion plugging agent. Firstly, an oligomer resin monomer and different high-temperature cross-linking agents are mixed to reaction by a catalyst under different heating temperature and time, then the mixture will be solidified through crosslinking. Secondly the reaction product after taking off the mold is pressed in the specific temperature in order to reserve deformation memory function. Finally the new polymer is crushed and granulated into various particle sizes according to demand at room temperature. The new plugging agent prepared has adjustable glass transition temperature, adjustable particle size, large compressive strength, large expansion at high temperature and high pressure, and the particle size growth rate of D₉₀ after aging at 150 ℃ and 20 MPa is 44.71% ~ 54.17%. It can adapt to crack size to bridging, moreover, block leaking channels deformed by squeezing to improve the retention capacity and pressure endurance capacity of the plugging fluid.