Elastic cement paste and preparation method thereof

Abstract

The invention relates to the technical field of oil well cement paste, in particular to elastic cement paste and a preparation method thereof. The elastic cement paste is prepared from oil well cement paste and elastic materials, wherein the mass of the elastic materials is 3-40% that of cement in the oil well cement paste. Compared with corresponding oil well cement paste, the Young modulus of the obtained elastic cement paste is greatly lowered, and the strength of extension of the obtained elastic cement paste is greatly improved. By adopting the elastic cement paste for carrying out well cementing operation, the problem that microcracks are produced inside set cement and / or micro annular clearances are produced on a cement-formation interface in the trial production processes such as oil gas well follow-up perforation and multi-stage large fracturing due to the inherent brittleness of the set cement is effectively solved. It is shown that the elastic materials can significantly improve the capacity of resisting of set cement for resisting external force deformation, the Young modulus of the set cement is lowered, the strength of extension of the set cement is improved, annulus breakthrough flow is reduced, and the requirement for perforation and multi-stage large-scale fracturing production can be met.

Description

technical field [0001] The invention relates to the technical field of oil well cement slurry, and relates to an elastic cement slurry and a preparation method thereof. Background technique [0002] Oil, gas, and water channeling are one of the major problems facing the cementing interface. If the interlayer is poorly sealed, the fluid in the high-pressure layer will channel into the low-pressure layer, resulting in the loss and waste of oil and gas resources. Poor cementation poses a huge threat to production capacity and environmental protection. Due to the brittleness of cement stone, during the subsequent perforation of oil and gas wells, multi-stage large-scale fracturing and other test production operations, the cement stone breaks and leads to micro-cracks, especially in areas where the target layer is thin and the bottom water layer is active. It leads to the connection between the water layer and the oil layer, which seriously affects the production effect. Conte...

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Problems solved by technology

[0003] The present invention provides an elastic cement slurry and its preparation method, which overcomes the deficiencies of the above-mentioned prior art, and can effectively solve the problem of subsequent perforation and In the process of multi-stage large-scale fracturing and other trial production operations, the cement stone is prone to breakage, resulting in micro-cracks, which leads to the connection between the water layer and the oil layer and seriously affects the production.

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