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

A technology of shale gas and defoaming agent, applied in the field of shale gas, can solve the problems of difficult defoaming agent and difference in defoaming ability of foaming agent, achieve high foam suppression ability, improve permeability and diffusivity, shorten The effect of bubble break time

Inactive Publication Date: 2021-09-07
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A foam row defoamer for normal pressure shale gas development, comprising the following components by weight in kg:

[0029] Silicone oil I 45kg, silicone oil II 15kg, silicone oil III 3kg, emulsifier 12kg, n-propanol 4kg, ascorbic acid 5kg, water 16kg;

[0030] At room temperature of 25°C, the viscosity of silicone oil I is 5cps, the viscosity of silicone oil II is 500cps, and the viscosity of silicone oil III is 5000cps;

[0031] The emulsifier is composed of polyvinyl ethers and lecithin, and the weight ratio of polyvinyl ethers and lecithin is 4:1. The preparation method of the above-mentioned atmospheric pressure shale gas development foam row defoamer, the process is as follows:

[0032] (1) Add silicone oil Ⅰ, silicone oil Ⅱ and silicone oil Ⅲ into the stirring tank, mix well, then add emulsifier into it, continue stirring well to obtain mixed solution Ⅰ, control the stirring speed to 350r / min;

[0033] (2) Add ascorbic acid into water, stir until dissolved, th...

Embodiment 2

[0036] A foam row defoamer for normal pressure shale gas development, comprising the following components by weight in kg:

[0037] Silicone oil I 40kg, silicone oil II 10kg, silicone oil III 1kg, emulsifier 10kg, n-propanol 2kg, ascorbic acid 2kg, water 35kg;

[0038] Among them, at a room temperature of 25°C, the viscosity of silicone oil I is 5cps; the viscosity of silicone oil II is 400cps; the viscosity of silicone oil III is 5000cps;

[0039] The emulsifier is composed of polyvinyl ethers and lecithin, and the weight ratio of polyvinyl ethers and lecithin is 3:1. The preparation method of the above-mentioned atmospheric pressure shale gas development foam row defoamer, the process is as follows:

[0040] (1) Add silicone oil Ⅰ, silicone oil Ⅱ and silicone oil Ⅲ into the mixing tank, mix well, then add emulsifier into it, control the stirring speed to 300r / min, and continue stirring to obtain mixed solution Ⅰ;

[0041] (2) Add ascorbic acid into water, stir until dissol...

Embodiment 3

[0044] A foam row defoamer for normal pressure shale gas development, comprising the following components by weight in kg:

[0045] Silicone oil I 50kg, silicone oil II 15kg, silicone oil III 5kg, emulsifier 15kg, n-propanol 5kg, ascorbic acid 3kg, water 7kg;

[0046] Among them, the viscosity of silicone oil I is 10cps at room temperature of 25°C; the viscosity of silicone oil II is 600cps; the viscosity of silicone oil III is 6000cps.

[0047] The emulsifier is composed of polyvinyl ethers and lecithin, and the weight ratio of polyvinyl ethers and lecithin is 5:1.

[0048] The preparation method of the above-mentioned atmospheric pressure shale gas development foam row defoamer, the process is as follows:

[0049] (1) Add silicone oil Ⅰ, silicone oil Ⅱ and silicone oil Ⅲ into the mixing tank, mix well, then add emulsifier into it, control the stirring speed to 400r / min, and continue stirring to obtain the mixed solution Ⅰ;

[0050] (2) Add ascorbic acid into water, stir un...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04
CPCB01D19/0404B01D19/0409B01D19/0418B01D19/0495
Inventor 周成香张宁波房大志杨修直李佳欣卓亦然程旭程泽虎徐海涛王祁邱建玲徐壮举刘波徐涛
Owner CHINA PETROLEUM & CHEM CORP
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