Pressure-sensitive chemical plugging agent for plugging channeling and leakage

The invention discloses a pressure-sensitive chemical plugging agent for plugging channeling and leakage. The chemical plugging agent is prepared from the following components in percentage by weight:88%-91% of superfine aluminate cement, 4%-8% of metal oxide, 0.2%-0.4% of calcium lignosulfonate, 1.2%-1.8% of algal siliceous rock, 1.4%-1.8% of fiber and 1.5%-2.7% of a micro-expanding agent. According to the pressure-sensitive chemical plugging agent for plugging channeling and leakage, experiments prove that the thickening time is 5-8 h, the linear expansion rate is 0.07%, resistant temperature is 120 DEG C or higher, compressive strength of a solidified body is 29 MPa or higher, the plugging rate reaches 99.9%, thixotropy, temperature resistance, pressure resistance, residence property and non-shrinkage property of the agent are good, and the pressure-sensitive chemical plugging agent has the advantages that initial setting time is controllable, leaking points are plugged rapidly, the structure of the solidi