Water absorption lightening material for cementing wells and application of material

Abstract

The invention discloses a water absorption lightening material for cementing wells. The material comprises, in weight percent, 20-30% of fly ash with different particle diameters, 30-40% of volcanic ash with different particle diameters, 2-5% of inorganic gel, 1-4% of nano-silicon dioxide and 25-35% of sepiolite powder. The raw materials are mixed to form the material. The particle diameter ranging from 10 nanometers to 100 nanometers accounts for 1%-2%; the particle diameter ranging from 1 micrometer to 10 micrometers accounts for 10%-20%; the particle diameter ranging from 10 micrometers to50 micrometers accounts for 40%-60%; the particle diameter ranging from 50 micrometers to 150 micrometers accounts for 10%-30%. Cement paste prepared from the water absorption lightening material canform more compact cement stones, the strength of low-density cement paste can be remarkably improved, the cement paste has a certain suspension stability, and the sedimentation stability of the cementpaste is improved.

Description

technical field [0001] The invention belongs to the technical field of well cementing in petroleum drilling engineering, and in particular relates to a water-absorbing lightening material for well cementing and an application thereof. Background technique [0002] As the exploration field continues to expand to complex and deep oil and gas reservoirs, more and more special wells and difficult wells are encountered in cementing. Among them, low pressure and easy leakage are more prominent problems. It is very necessary to have a low-density cement slurry system with multiple characteristics to meet the cementing requirements of complex wells. At present, low-density cement slurry is mostly used to reduce the density of cement slurry by adding low-density materials and increasing the water-cement ratio. The most commonly used low-density materials are fly ash, bentonite, diatomaceous earth, expanded perlite, expanded vermiculite, asphalt, slag, plastic powder, walnut shell po...

AI Technical Summary

Problems solved by technology

There are also many research institutes conducting research and on-site application of fly ash low-density cement slurry system. Although fly ash is cheap, it has good permeability resistance, sulfate corrosion resistance, good economic and environmental benefits, etc. However, there are still problems similar to other lightening agents, such as slow strength development, limited lower limit of density, unstable system, etc.

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