Novel liquid silicon anti-channeling cement slurry used in well cementation

Abstract

The invention discloses a novel liquid silicon anti-channeling cement slurry used in well cementation, which includes following raw materials, by weight, 95-105 parts of G-grade cement, 10-35 parts of a strength stabilizer, 0.5-4 parts of a retarder, 0.1-0.2 parts of a defoaming agent, 5-15 parts of a filling agent, 0.5-2 parts of a dispersing agent, 100 parts of water, 5-15 parts of an anti-gas channeling agent, 5-10 parts of a fluid loss agent and also a density adjusting agent. The raw materials are mixed and stirred uniformly to prepare the novel liquid silicon anti-channeling cement slurry. The anti-channeling cement slurry is low in water loss, is good in stability, is short in static gelatinization transition time, is strong in anti-gas channeling performance, is quick in early strength development at a low temperature and resists corrosion of acidic mediums. Set cement slurry is slight in expansion, is less in porosity, is high in compactness and low in permeability, and can satisfy requirements in various well cementation situations.

Description

technical field [0001] The invention relates to a novel liquid silicon anti-channeling cement slurry for well cementing, which belongs to the field of petroleum and natural gas drilling engineering technology and oil field chemistry. Background technique [0002] At present, more and more attention is paid to the anti-channeling effect of cement slurry, and the anti-channeling ability of cement slurry has become a key research topic in the field of cementing. In the existing cementing operations, there are shallow gas layers and surface aquifers, low formation pressure bearing capacity, and low operating temperature in winter, so that the cement slurry gels slowly and develops strength slowly, and the weight loss of the cement slurry during curing leads to a drop in liquid column pressure. It is very easy to lead to the occurrence of water-gas channeling. Gas channeling is a common phenomenon in natural gas cementing. A potential problem exists in almost all natural gas wel...

AI Technical Summary

Problems solved by technology

For example, the solid content of the liquid latex obtained by the prior art can only reach about 50%, while the solid content of the polymer latex powder often reaches more than 95%. The amount will increase, which will reduce the compressive strength of cement stone, and will cause fluctuations in the density, fluidity and thickening time of cement slurry.

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