Deepwater cementing low-temperature early strength agent

Abstract

The invention relates to a deepwater cementing low-temperature early strength agent. The low-temperature early strength agent comprises the following components in percentage by weight: 33 to 66 percent of alkali metal bromides, 6 to 16 percent of sodium metaaluminate, 15 to 35 percent of alkali metal hydroxides, 8 to 15 percent of silicon dioxide and 0.8 to 1.5 percent of alcamines organics, wherein the alkali metal bromides are a mixture of one, two or more of NaBr, KBr and LiBr; the alkali metal hydroxides are NaOH, KOH or a mixture of the NaOH and KOH; and the alcamines organics are triethanolamine, triisopropanolamine or a mixture of the triethanolamine and triisopropanolamine. The deepwater cementing low-temperature early strength agent has small influence on rheological behaviour of cement paste at low temperature, can prompt the cement paste to be solidified rapidly at low temperature and reach higher early strength, shortens the thickening time of the cement paste at lower temperature and can well meet the requirements of the cementing construction of a surface casing under the conditions of low temperature, shallow gas and the like.

Description

Technical field [0001] The invention relates to a low-temperature early-strength agent for deep-water well cementing, and belongs to the technical field of oil-gas well cementing. Background technique [0002] The exploration and development of oil and gas resources in deep water areas is limited by the harsh and complex environment and storage characteristics, and has the characteristics of "four highs", namely high-tech, high-risk, high-skilled personnel, and high return. Whether a well can be safely and economically exploited for decades, and whether it can withstand the test of stimulation measures, perforation, exploitation and various workover operations in the production process of oil and gas wells, is often related to the cementing process. Quality is closely related. For the difficulties faced by deep water exploration, the quality requirements for deep water cementing are often particularly high. Compared with conventional cementing, deepwater cementing, especia...

AI Technical Summary

Problems solved by technology

[0003] At present, the water-soluble early-strength agents of deep-water cementing slurry are mainly chlorides, which have side effects such as large hydration heat release and corrosion of casing and cement; non-water-soluble early-strength agents can only be used for dry mixing. The well site of the equipment has certain application limitations, and is sensitive to temperature, so it can only be applied to a single temperature condition

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