Suspension stabilizer for high-temperature cement paste and high-temperature-resistant cement paste prepared by same

Abstract

The invention discloses a suspension stabilizer for high-temperature cement paste and high-temperature-resistant cement paste prepared by the same. The suspension stabilizer is formed by the followingcomponents according to the parts by weight: 0.5-4 parts of a fiber material, 1-5 parts of a surfactant powder material, and 0.5-2 parts of a flocculant powder material. The fiber material is a mixture of one or two materials in whisker, sepiolite, ceramic fibers, basalt fibers, and brucite fibers. The surfactant powder material is one of lauryl sodium sulfate, sodium dodecyl sulfate, hexadecylsulfonic acid sodium salt, sodium octadecyl benzene sulfonate, petroleum sodium sulfonate, white dextrin and yellow dextrin. The flocculant powder material is one of polyferric sulfate, aluminum polychlorid, and poly-aluminum ferric silicate sulfate. The high-temperature-resistant cement paste prepared by using the suspension stabilizer is low in initial consistence, and good in sedimentation stability. The suspension stabilizer is capable of improving the high-temperature suspension stability and the set cement strength of the cement paste, and providing technical support for the exploration and development of deep oil and gas resources.

Description

technical field [0001] The invention relates to a suspension stabilizer for high-temperature cement slurry and the high-temperature-resistant cement slurry prepared therefrom, belonging to the field of oil and gas exploration and development. Background technique [0002] With the deepening of exploration and development of oil and gas reservoirs, the number of deep and ultra-deep wells is increasing, and the bottom hole temperature is getting higher and higher. Some layers contain large sections of gypsum-salt layer and brine layer, which poses a great challenge to the design of cement slurry settlement stability. . The higher the bottom hole temperature, the more difficult it is to ensure the settlement stability of the cement slurry; and the settlement stability of the brine cement slurry is more difficult to guarantee than the non-brine cement slurry. The settlement stability of the cement slurry is not good, and the phenomenon of settlement and delamination is prone to...

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Problems solved by technology

[0004] At present, the use of the above-mentioned suspension stabilizers can ensure the settlement stability of cement slurry below 160°C and the settlement stability of brine slurry below 120°C, but there are still some problems: 1) The thickening effect at room temperature is obvious, and it is easy to affect the cement slurry 2) Due to the obvious thickening effect at room temperature, if the ash samples on site are mixed unevenly, local thickening and poor fluidity of the cement slurry are likely to occur 3) The suspension mechanism mainly relies on the thickening effect of polymer materials and inorganic materials. Generally, as the temperature rises, the thickening suspension effect gradually decreases, so the thickening curve of cement slurry often appears " Due to the phenomenon of high-temperature dilution of “inverted steamed bread peak”, the cement slurry will settle to different degrees under high temperature; 4) The high-temperature-resistant thickening polymer powder material in the suspending agent is currently mainly imported from abroad, and the price remains high, resulting in cement The market price of the slurry suspension stabilizer is high; 5) When the temperature exceeds 160°C, the settlement stability of the high-temperature non-salt water cement slurry cannot be solved well, and the upper and lower density difference of the cement slurry exceeds 0.03g / cm 3 ; When the temperature exceeds 120°C, the settlement stability of the high-temperature brine cement slurry cannot be solved well, and the upper and lower density difference exceeds 0.03g / cm 3

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