Foam scrubbing defoaming agent for developing normal-pressure shale gas and preparation method of foam scrubbing defoaming agent

Abstract

The invention provides a foam scrubbing defoaming agent for developing normal-pressure shale gas and a preparation method of the foam scrubbing defoaming agent. The defoaming agent comprises silicone oil I, silicone oil II, silicone oil III, an emulsifier, n-propyl alcohol, ascorbic acid and water. The viscosity of the silicone oil I is 5-10 cps; the viscosity of the silicone oil II is 400 to 600 cp s; and the content of the silicone oil III is 5000-6000 cp s. The preparation process comprises the following steps: adding the silicone oil I, the silicone oil II and the silicone oil III into a stirring tank, and then adding the emulsifier into the stirring tank to obtain a mixed solution I; adding ascorbic acid into water, stirring until the ascorbic acid is dissolved, and then adding n-propyl alcohol to obtain a mixed solution II; heating the mixed solution I to 50 DEG C, and then adding the mixed solution II into the mixed solution I to obtain the defoaming agent. In the foam scrubbing defoaming agent, three kinds of silicone oil with different viscosities are selected as active substances of the defoaming agent, so that the universality of the defoaming agent can be effectively improved, and the foam breaking time of the defoaming agent is effectively shortened. The preparation method is simple, easy in process control and suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of shale gas, in particular to a foam row defoamer for normal pressure shale gas development and a preparation method thereof. Background technique [0002] Shale gas is a clean energy with abundant reserves, which can replace conventional oil and gas energy. Therefore, there are more and more researches on the exploitation of shale gas. [0003] At present, in the process of shale gas exploitation, foaming is an important treatment process. Through foaming, the foaming agent and the accumulated liquid are mixed to form a drum water state. During the rising process of the gas, the water is carried out of the well to achieve drainage. The purpose is to improve the production of shale gas and the stability of shale gas wells. This process is of great significance in the exploitation of shale gas. [0004] After the foam after foaming is returned to the ground, defoaming treatment is required to avoid the impa...

AI Technical Summary

Problems solved by technology

However, due to the different types of defoamers, there are differences in the defoaming capabilities of different types of foaming agents. In the process of on-site construction, some general-purpose defoamers are usually required for emergency use. The existing defoamers Therefore, it is of great significance to provide a general-purpose defoamer in shale gas exploitation

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