The invention relates to an elasto-plastic
well cementing cement slurry and a preparation method thereof, which belongs to the field of gas
well cementing. The elasto-plastic
well cementing cement slurry comprises the following components in parts by weight: 100 parts of
cement, 0-40 parts of a high-temperature stabilizing agent, 0-200 parts of a density adjuster, 4-10 parts of a filtrate loss
reducer, 0-3 parts of a dispersing agent, 0-2.5 parts of a
retarder, 35-110 parts of water, 0.2-0.5 part of a defoaming agent, 3-12 parts of a
plasticizer, and 5-8 parts of a nano filler. The elasto-plastic well cementing
cement slurry can improve the bending resisting strength and the
impact resisting strength of the cement stone and reduce the
elastic modulus of the cement stone. Under high temperature and
high pressure, the brittle deformation of the elasto-plastic well cementing
cement slurry is converted into the plastic deformation, thus the later exploitation is guaranteed, and the service life of the oil-gas well is prolonged.