Elasto-plastic well cementing cement slurry and preparation method thereof

Abstract

The invention discloses an elasto-plastic well cementing cement slurry which is prepared from the following components in parts by weight: 100 parts of cement, 0-12 parts of high-temperature stabilizing agent, 0-200 parts of density adjuster, 4-10 parts of filtrate loss reducer, 0-2 parts of dispersing agent, 0-1.5 part of retarder, 35-110 parts of water, 0.2 part of defoaming agent and 2-15 parts of plasticizer. The elasto-plastic well cementing cement slurry can improve the bending resisting strength and the impact resisting strength of the cement stone and reduce the elastic modulus of the cement stone. Under high temperature and high pressure, the brittle deformation of the elasto-plastic well cementing cement slurry is converted into the plastic deformation, thus the later exploitation is guaranteed, and the service life of the oil-gas well is prolonged.

Description

technical field

[0001] The invention relates to cement, in particular to well cementing cement slurry and a preparation method thereof. Background technique

[0002] In the process of oil and gas well development, cement stone is a brittle material with inherent microscopic defects, and has inherent defects such as low tensile strength, poor fracture resistance and low impact strength. The downhole cement sheath is affected by the high-energy flow of the perforating bullet, and it bears the impact pressure of 3-4Gpa in an instant, and its stress wave forms a tensile high-stress area in the cement sheath locally. , the cement sheath will break and form macroscopic cracks. Subsequent production stimulation measures during the development of oil and gas wells further expanded these cracks, and even completely failed the sealing effect of the cement sheath, resulting in interlayer channeling of underground fluids (oil, gas, water). If this happens in production wells, oil and ...

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