Dual-channel multiphase fluid nuclear magnetic resonance online detection device and method

Abstract

The embodiments of the present invention provide a dual-channel multiphase fluid nuclear magnetic resonance on-line detection device and method, wherein the device includes: the two ends of the nuclear magnetic pipeline are single branch pipelines, and the middle part of the nuclear magnetic pipeline includes two identical branch pipelines; first The two ends of the branch pipeline are respectively provided with controllable switches; the two sections of the branch pipeline are in the magnetic coverage area of ​​the antenna equipment; the magnetic coverage area of ​​the antenna equipment is placed in the uniform magnetic field area of ​​the dipole magnet; the control device controls the two controllable switches. Turn off and on; when the two controllable switches are turned off at the same time, the spectrometer device drives the first coil to emit gradient magnetic field, and drives the second antenna to emit nuclear magnetic resonance pulse sequence, and obtains the first echo train data set corresponding to the first branch pipeline , obtain the second echo train data set corresponding to the second branch pipeline, and respectively detect the content of each component in the multiphase fluid and the flow rate of the multiphase fluid according to the first echo train data set and the second echo train data set, And determine the flow of each component in the multiphase fluid.

Description

technical field [0001] The invention relates to the technical field of oil drilling and production, in particular to a dual-channel multiphase fluid nuclear magnetic resonance on-line detection device and method. Background technique [0002] In the field of oil drilling and production engineering, the online quantitative detection of multiphase flow in oil and gas wells and pipelines is extremely challenging. There is no reliable technology that can accurately measure the components of multiphase flow without the three-phase separation of oil, gas and water. flow. So far, the multiphase flow measurement technology commonly used at home and abroad is to transport the produced fluid to the gathering and transportation station through pipelines, first separate the three phases, and then measure the content of each component separately. This indirect measurement method has problems such as low efficiency, high cost, and data delay, and cannot reflect the real transient fluid p...

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Problems solved by technology

[0005] The embodiment of the present invention provides a dual-channel multiphase fluid nuclear magnetic resonance online detection device to solve the technical problem of inaccurate flow measurement results in the prior art

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