Liquid lightening agent and preparation and application thereof

Abstract

The invention discloses a liquid lightening agent as well as preparation and application thereof. The liquid lightening agent comprises water, hollow microspheres and a high-molecular polymer, wherein a weight ratio of the water to the hollow microspheres to the high-molecular polymer is (40-60): (26-56): (0.5-2). The lightening agent provided by the invention not only can play a role in reducing the density, but also is a lightening material which can be added in a liquid form. Liquid addition of lightening materials is realized, so flexible preparation of the low-density cement paste is realized, and convenience is provided for on-site preparation of the low-density cement paste. In addition, the lightening agent provided by the invention can be stably stored for a long time.

Description

technical field [0001] This article relates to but not limited to the density adjustment of cement slurry, especially relates to but not limited to a liquid suspension alleviating agent for well cementing. Background technique [0002] Cementing is a key link in the drilling process. It serves the purpose of supporting the casing and isolating the formation. When the fracture pressure of the formation is narrow, in order to prevent the formation from fracturing, low-density cement slurry is usually used for cementing. There are two commonly used low-density cement slurry methods: one is to use suspended materials such as soil slurry and water glass, and to achieve it by increasing the water-cement ratio of the cement slurry. The waiting setting strength is low, which cannot meet the needs of rapid drilling in the next step; another method is to add hollow low-density materials such as hollow microspheres, floating beads, and expanded perlite to reduce the density of cement s...

AI Technical Summary

Problems solved by technology

There are two commonly used low-density cement slurry methods: one is to use suspended materials such as soil slurry and water glass, and to achieve it by increasing the water-cement ratio of the cement slurry. The waiting setting strength is low, which cannot meet the needs of rapid drilling in the next step; another method is to add hollow low-density materials such as hollow microspheres, floating beads, and expanded perlite to reduce the density of cement slurry, which can effectively reduce the water-cement ratio. Improve the strength of cement stone, but the disadvantage is that such hollow materials generally need to be dry-mixed with cement in advance at the ash station due to the large amount of addition. Once dry-mixed, the density of the cement slurry is difficult to further adjust due to the fixed ratio. And usually in the process of operation preparation, it is generally necessary to store the solid ash of conventional density cement slurry and low density cement slurry, which will also increase the number of storage tanks. In addition, during offshore cementing operations, due to the influence of sea wind, solid materials especially It is a low-density material, which is easy to cause loss during the soot blowing process, which is not conducive to the stability of the density in the later stage

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