Synthetic method for alcohol ether sulfate salt foaming agent

Abstract

The invention discloses a synthetic method for an alcohol ether sulfate salt foaming agent. The synthetic method comprises the following steps: fatty alcohol polyoxyethylene ether and sulfamic acid in the mole ratio being 1: (1.15-1.25) are added, then a catalyst is added, the mixture reacts for 2-4 h under the condition of 105-125 DEG C to prepare alcohol ether sulfate salt. The sulfamic acid is adopted to serve as a sulfating agent in the synthetic method and does not contain inorganic salt, and inorganic salt is prevented from being introduced into a final product; the reaction is simple and finished by one step, process parameters in the synthetic process are optimized, better process conditions are screened out, and the foaming power, the foam stability and the liquid carrying capacity of the prepared alcohol ether sulfate salt are better obviously.

Description

technical field [0001] The invention belongs to a foaming agent for oil and gas field development, in particular to a method for synthesizing an alcohol ether sulfate foaming agent. Background technique [0002] In the development of oil-water and gas fields, with the production of natural gas, formation water and condensate oil continue to enter the wellbore with the natural gas. If the gas has enough energy, it can bring the liquid entering the wellbore to the surface, and no liquid accumulation will occur at the bottom of the well. In the middle and later stages of natural gas exploitation, due to insufficient gas volume or a large amount of liquid in the production layer, the gas cannot completely bring water and condensate oil to the surface, and liquid accumulation occurs at the bottom of the well and in the wellbore. If it is not discharged in time, back pressure will occur. At the same time, the permeability of the production layer near the well wall is deteriorated,...

AI Technical Summary

Problems solved by technology

[0004] Alcohol ether sulfate foaming agents are widely used in drainage and gas recovery because of their good foaming ability and liquid carrying capacity, but in the actual production of alcohol ether sulfate foaming agents, there are usually the following disadvantages: the use of chlorine The two sulfating agents, sulfonic acid or sulfur trioxide, can generally obtain better industrial products, but in contrast, although the use of chlorosulfonic acid will remove hydrogen chloride during the production process, there will still be a small amount of sodium chloride in the end and other inorganic salts remain in the final product, and the molar ratio of chlorosulfonic acid to fatty alcohol in the reaction is also slightly higher than the molar ratio of sulfur trioxide to fatty alcohol. Sulfating agent is superior to chlorosulfonic acid in terms of reactivity, output, quality and cost. However, when sulfur trioxide is used to synthesize alcohol ether sulfate foaming agent in the laboratory, the requirements for equipment are higher

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