Elastic well cementation cement paste and preparation method thereof

Abstract

The invention discloses an elastic well cementation cement paste and a preparation method thereof. The elastic well cementation cement paste comprises the following components in percentage by weight based on 100% of the cement weight: 1-2% of a fluid loss agent, 4-12% of an elastic material, 0.5-1.5% of a dispersing agent, 0.5-2% of a toughening agent, 0.4-1% of a defoaming agent, 0.5-2% of a retarder, 0-50% of a density regulator and 33-50% of fresh water. The method for preparing the elastic well cementation cement paste comprises the following steps of: firstly, uniformly mixing the elastic material, the toughening agent, the density regulator and cement in a dry manner for later use; then uniformly mixing the fluid loss agent, the dispersing agent, the defoaming agent, the retarder and the fresh water in a wet manner; and finally, under a stirring condition, adding an additive obtained after dry mixing into a material obtained after wet mixing, and uniformly stirring to obtain the elastic well cementation cement paste. The elastic well cementation cement paste increases the elasticity of cement stone and reduces the Young modulus, and a cement ring has high impact resistance and toughness, so that the damages of downhole operation to the cement ring are reduced.

Description

technical field [0001] The invention belongs to the technical field of cement slurry preparation, and in particular relates to an elastic well cementing cement slurry and a preparation method thereof. Background technique [0002] Ordinary cementing cement slurry has low elasticity and high brittleness, and cracks will be generated under the impact load generated by perforation, fracturing and other operations. With the development of stress, cracks will be formed, which will easily cause channeling of oil and gas layers, which will hinder the development and reconstruction of perforation. Potential tapping and other production increase measures have brought great difficulties. Contents of the invention [0003] The invention provides an elastic well cementing cement slurry and its preparation method, aiming at solving the problem that ordinary well cementing cement slurry has low elasticity and high brittleness, and cracks are generated under the impact load generated by ...

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Problems solved by technology

[0003] The invention provides an elastic well cementing cement slurry and its preparation method, aiming at solving the problem that ordinary well cementing cement slurry has low elasticity and high brittleness, and cracks are generated under the impact load generated by operations such as perforation and fracturing. The development of cracks will easily lead to the channeling of oil and gas layers, which will bring great difficulties to the production stimulation measures such as perforation development and transformation to tap potential.

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