Making method of oil-well cement expansion agent

Abstract

The invention discloses a making method of an oil-well cement expansion agent. The making method comprises the following steps: uniformly mixing graphite powder, calcium silicate, magnesium oxide and calcium oxide according to a proportion, calcining at the temperature of 1,050 to 1,180 DEG C for 100 minutes, and cooling to the room temperature to obtain a mixture A; uniformly mixing a sulfonyl hydrazide compound, butadiene-styrene, a butadiene styrene rubber emulsion and a cement waterproofing agent according to a proportion, calcining at the temperature of 90 to 100 DEG C for 15 minutes, and cooling to the room temperature to obtain a mixture B; uniformly mixing the mixture A, the mixture B and slag with hydraulic activity according to a proportion, and grinding the mixture till the fineness is 400 to 500 meshes to obtain the oil-well cement expansion agent.

Description

technical field [0001] The invention relates to the field of cement, in particular to a preparation method of an oil well cement expansion agent. Background technique [0002] The high water loss and volume shrinkage in the cement hydration process of oil wells are the main reasons for the poor bonding quality of the cement annulus interface, the channeling of oil, gas and water in the well, and the pollution of the oil layer. This is also a cementing technology that has not yet been well resolved. problem. The volume shrinkage after solidification causes problems in the bonding between the cement sheath and the formation and the casing, forming micro-gap, which not only affects the cementing quality but also causes a large loss of oil and gas resources. [0003] In recent years, cementing engineers have carried out a lot of research on this, and put forward the problem of how to compensate the volume space and prevent the generation of micro-annulus. Methods such as: infl...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the performance of the existing cement cannot meet the actual use needs, and there is an urgent need for an expansion agent to make the oil well cement have high strength, good stability, impermeability, corrosion resistance, etc. The purpose is to provide a method for making an oil well cement expansion agent, which can solve the problems that the strength of oil well cement is not high and other properties do not meet the needs of actual use