The invention provides a high-density
potassium salt-resistant cementing
slurry applied to high-pressure oil-gas wells and high-pressure
potassium salt
well cementing construction. The high-density
potassium salt-resistant cementing
slurry is prepared from the raw materials in percentage by
mass: 29-58% of Jiahua grade-G
cement, 12-56% of
a weighting agent, 1.8-3.5% of active micro-
nano silicon, 10-20% of 80-mesh
quartz sand, 1-2% of a salt-resistant dispersing agent, 1.8-4% of a salt-resistant fluid loss agent, and 0.3-1.0% of salt-resistant
retarder, wherein the weighting agent is a mixture of 250-mesh
hematite and 1200-mesh
hematite, the salt-resistant dispersing agent is a
formaldehyde /
acetone copolymer, the salt-resistant fluid loss agent is the
polymer of N,N-dimethacrylamide and
maleic anhydride, and the
retarder is the compound of ketonic acid and organic
phosphate; the density of the cementing
slurry is 2.0-2.6 g / cm<3>, the fluidity of the cementing slurry is 19-21 cm, the API (American
Petroleum Institute) fluid loss of the cementing slurry is not greater than 50 ml, the rheological property n of the cementing slurry is not less than 0.5, and K is not greater than 2.