Agent for purifying gas wells and draining and preparation method thereof

Abstract

The invention provides an agent for purifying and draining gas wells and a preparation method thereof, and relates to the field of gas well purification. The agent comprises, by weight, 30 to 80 partsof alkyl methylamino carboxylic acid, 5 to 20 parts of polyoxyethylene ether, 5 to 20 parts of ethylene oxide-propylene oxide copolymer, 0.1-1 part of perfluoroalkyl ammonium chloride and 0.1 to 2 parts of 2,5-alkyl pyrazine. The preparation method comprises the following steps: mixing the alkyl methylamino carboxylic acid with water, heating to 45-55 DEG C, under the conditions of stirring at the constant temperature of 45-55 DEG C, mixing with the polyoxyethylene ether, the perfluoroalkyl ammonium chloride and the 2,5-alkyl pyrazine, stirring at the constant temperature for 20 to 40 minutes, mixing with the ethylene oxide-propylene oxide copolymer, completely dissolving and cooling. The agent has strong purification efficiency, wide purification adaptability and strong foaming capability, and effectively improves the purification effect of the wellbores of the gas wells.

Description

technical field [0001] The invention relates to the field of gas well purification, in particular to a medicament for gas well purification and liquid drainage and a preparation method thereof. Background technique [0002] The natural gas extraction process is a resource extraction mode guided by a columnar wellbore. The wellbore is the most important part of the extraction device, which can connect the natural gas reservoir with the surface pipeline to achieve the purpose of natural gas extraction. The wellbore is usually made of special steel. When the gas well is developed to the middle and later stages, the scale, corrosion, sediment, oil, organic accumulation, emulsion, etc. in the wellbore will accumulate more and more, resulting in the cross-sectional area of ​​the wellbore pipe diameter Unfavorable consequences such as drop, blockage of pipe shoes and perforation sites, and increased viscosity of produced fluids have greatly increased the burden on the gas well, whi...

AI Technical Summary

Problems solved by technology

The wellbore is usually made of special steel. When the gas well is developed to the middle and later stages, the scale, corrosion, sediment, oil, organic accumulation, emulsion, etc. in the wellbore will accumulate more and more, resulting in the cross-sectional area of ​​the wellbore pipe diameter Unfavorable consequences such as the decline of the gas flow rate, the blockage of the pipe shoe part and the perforation part, and the increase of the viscosity of the produced fluid greatly increase the burden on the gas well, which may cause abnormal production reduction of the gas well and cannot be recovered

[0003] In order to solve the problem of increased wellbore clogging due to foreign matter, the plugging removal process of injecting plugging remover has been developed. If there is scaling pollution, add acid plugging remover, organic accumulation pollution, add organic plugging remover, etc. After that, Gradually develop composite plugging remover and its on-site technology and have achieved certain results, making a certain contribution to maintaining the stable production of gas wells in the middle and late stages

[0004] However, the existing plugging agents with similar functions, the main problem in the plugging removal process is that they are highly targeted, that is, they mainly target a single accumulation for plugging removal

However, there are often quite complex blocking environments in the later stages of gas wells. The existing plugging removers often show insufficient performance during use, and often require the coordination of multiple agents to solve some problems. Such an injection process is not only prone to agent Compatibility problems, and the final performance is generally low

In addition, the existing plugging remover cannot be diluted during use, resulting in a large amount of addition. For the later stage of the gas well, the liquid accumulation pressure is too high, and the added plugging remover is often difficult to discharge and causes a greater burden on the gas well; According to this situation, an auxiliary foaming agent is usually required for operation, the process is complicated, the control is poor, and the efficiency is low

The existing foaming agent can effectively reduce the burden of chemical backflow, but the purification efficiency of the foaming agent itself is extremely low

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