China Petroleum Chemical Corporation

Shanghai Research Institute of Petrochemical Technology, Sinopec

Comnav Technology Ltd.

Xiaodong Zhai

Weidong Zhang

Songyuan Gu

Yingcheng Li

Zhiqin Shen

Xinning Bao

Ou Sha

Yiqing Yang

Hengzhi Tang

Min Xu

Xining Bao

An anionic-cationic-nonionic surfactant represented by the formula (I) exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present anionic-cationic-nonionic surfactant, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.

Anionic-cationic-nonionic surfactant, production and use thereof

This invention relates to a surfactant composition, production and use thereof in tertiary oil recovery. The present surfactant composition comprises a cationic surfactant and an anionic-nonionic surfactant, and exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present surfactant composition, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.

Surfactant composition, and manufacturing method and application of same

This invention relates to a surfactant composition, production and use thereof in tertiary oil recovery. The present surfactant composition comprises a cationic-nonionic surfactant and an anionic surfactant, and exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present surfactant composition, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.

Surfactant composition and preparation method therefor and application thereof

This invention relates to an anionic-cationic-nonionic surfactant as substantially represented by the formula (I), production and use thereof in tertiary oil recovery. The anionic-cationic-nonionic surfactant of this invention exhibits significantly improved interfacial activity and stability as compared with the prior art. With the present anionic-cationic-nonionic surfactant, a flooding fluid composition for tertiary oil recovery with improved oil displacement efficiency and oil washing capability as compared with the prior art could be produced.  In the formula (I), each group is as defined in the specification.

A GNSS board comprises a narrowband interference suppression module comprising an interference suppression pathway to receive an intermediate frequency (IF) signal, a bypass pathway to receive an intermediate frequency signal, an interference control switch, and a data strobe switch, wherein, the interference suppression pathway includes a signal conversion module, an interference detection module and an interference processing module, wherein the signal conversion module converts the intermediate frequency signal from a time domain signal to a frequency domain signal; the interference detection module determines whether there is interference with the frequency domain signal, and in the case of interference, obtains interference frequency information, makes the interference control switch close and the data strobe switch switch from the bypass pathway to the interference suppression pathway; and the interference processing module performs interference suppression processing on the frequency domain signal based on the interference frequency signal to obtain an interference-canceled IF signal output by the data strobe switch; the interference detection module makes the interference control switch open and the data strobe switch connect to the bypass pathway in the case of no interference.

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Shanghai, China

Xiaodong Zhai