Retardation cement mortar
A cement slurry and retarding technology, applied in the field of retarded cement slurry, can solve the problems of cement slurry wellbore sealing, oil pipes and downhole tools not being pulled out, etc.
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Embodiment 1
[0010] The retarded cement slurry of the present invention is prepared from the following components in weight percent: urea: 23.4%, guar gum: 0.05%, G grade cement: 53%, water: 23.55%. The guar gum in this implementation is the suspending agent.
[0011] Thickening time at 40°C > 48 hours (initial consistency 2.6Bc, after 48 hours the consistency is 0.8Bc); put it into the mold and wait for 3 days to take it out, the compressive strength is 12.4MPa.
Embodiment 2
[0013] The retarded cement slurry of the present invention is prepared from the following components in weight percent: urea: 21.2%, guar gum: 0.05%, G grade cement: 57.7%, water: 21.05%.
[0014] Thickening time at 40°C > 18 hours (initial consistency 3.3Bc, after 18 hours the consistency is 6.2Bc); put it into the mold and wait for 3 days to take it out, the compressive strength is 15.4MPa.
Embodiment 3
[0016] The retarded cement slurry of the present invention is prepared from the following components in weight percent: urea: 19.2%, guar gum: 0.1%, G-grade cement: 61.4%, and water 19.3%.
[0017] Thickening time at 40°C > 10 hours (initial consistency 3.6Bc, 8.8Bc after 10 hours); put it into the mold and wait for 3 days to take it out, the compressive strength is 17.5MPa.
[0018] During on-site construction, add water, urea, and suspending agent to the mixing tank according to the formula, stir until dissolved, then add cement in a metered amount, continue to stir evenly, and use a squeeze pump or cement truck to pump in the front liquid and retarded cement accordingly Slurry, displacement fluid, subsequent backwashing of the well, adoption of steam injection to accelerate coagulation, or shutting down the formation to automatically raise the temperature and wait for coagulation can be determined according to specific conditions.
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