Salt-resistant type low-temperature foam lifting drainage chemical additive, and preparation method and application thereof

Abstract

The invention relates to a salt-resistant type low-temperature foam lifting drainage chemical additive, and a preparation method and an application thereof. The chemical additive is prepared through mixing cocamidopropylamine oxide, dodecyl polyglucoside, lauryl hydroxypropyl sulphobetaine and ethylene glycol according to a certain proportion uniformly. The chemical additive cannot be frozen under the lowest temperature condition in winter in various gas fields in China, satisfies site ground construction requirements and has a wide application prospect. Moreover, the chemical additive does not have stimulus and has excellent salt resistance; and under the condition that the mineralization degree is 200000 milligrams / liter, the chemical additive does not generate precipitation and still has excellent foaming and liquid carrying capabilities.

Description

technical field [0001] The invention relates to a salt-resistant low-temperature foam lifting and drainage chemical agent and its preparation method and application. Background technique [0002] Bottomhole fluid accumulation in gas wells is very common, seriously affecting the ultimate recovery of gas fields. Foam drainage gas recovery technology has become one of the main technologies selected by gas fields in my country. However, in winter, in addition to the gas fields in the Sichuan-Chongqing Basin, other gas fields in my country include the Sebei Gas Field in the Qaidam Basin, the Sulige and Jingbian Gas Fields in the Shaanxi-Gansu-Ningxia Basin, the Xushen Gas Field in the Daqing Oilfield, and the Tarim Basin. For gas fields, the ground environment temperature in winter will reach about -20° to -30°, and the general liquid foaming agent will freeze at this temperature and cannot be injected, so special low-temperature foaming agent of winter antifreeze type is require...

AI Technical Summary

Problems solved by technology

However, this foaming agent has the following disadvantages: the active ingredient capable of foaming is only a component of Sapindus saponin, which is too single and fails to fully utilize the synergistic effect between surfactants

However, this foaming agent has the following disadvantages: when the salinity is greater than 150g / L, the anionic surfactant fatty alcohol polyoxyethylene ether sodium sulfate, alkyl sodium sulfate, and sodium carboxymethylcellulose will all interact with the cations in the formation water. Combined with the generation of sediment, the foaming and liquid-carrying capacity are greatly reduced. At the same time, the generated sediment may increase the skin factor near the wellbore and reduce the productivity of the gas well.

[0006] At present, there is no foaming agent with good application effect in gas wells with high salinity. In order to provide a low-temperature foaming agent with better performance, the present invention is proposed.

Images