Cement paste for inhibiting deformation of casing and preparation method thereof

The invention provides cement paste for inhibiting deformation of a casing and a preparation method of the cement paste. The cement paste for inhibiting deformation of the casing pipe is prepared by mixing the following raw materials in parts by mass according to 100 parts by mass of Portland cement: 25 to 30.0 parts of silicon powder, 10.0 to 50.0 parts of strain agent, 0.5 to 4.0 parts of micro silicon, 2.0 to 4.0 parts of expanding agent, 0.8 to 1.4 parts of dispersing agent, 1.4 to 2.1 parts of fluid loss agent, 0.1 to 0.8 part of retarder, 0.2 to 0.25 part of defoaming agent and 55 to 85 parts of water. The cement paste has the beneficial effects that the cement paste has good engineering performance, the range of 1.60-1.85 g/cm < 3 > can be adjusted, the rheological property and stability are good, the API filtration water loss is less than 50 ml, and the thickening time is easy to adjust; and the absorption deformation quantity of set cement formed after the cement paste is solidified is greater than 2