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

Abstract

The embodiment of the invention provides a dual-channel multiphase fluid nuclear magnetic resonance online detection device and method, and the device comprises a nuclear magnetic pipeline, two ends of the nuclear magnetic pipeline are single branch pipelines, and the middle part of the nuclear magnetic pipeline comprises two identical branch pipelines; controllable switches are respectively arranged at two ends of the first branch pipeline; the two sections of branch pipelines are positioned in a magnetic coverage area of the antenna equipment; the magnetic coverage area of the antenna equipment is arranged in the uniform magnetic field area of the bipolar magnet. Control equipment controls the two controllable switches to be turned off and turned on. When the two controllable switches are turned off at the same time, the spectrometer device drives the first coil to emit a gradient magnetic field and drives the second antenna to emit a nuclear magnetic resonance pulse sequence, a first echo string data set corresponding to the first branch pipeline is obtained, and a second echo string data set corresponding to the second branch pipeline is obtained. According to the first echo string data set and the second echo string data set, the content of each component in the multiphase fluid and the flow rate of the multiphase fluid are respectively detected, and the flow rate of eachcomponent in the multiphase fluid is determined.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling, in particular to a dual-channel multiphase fluid nuclear magnetic resonance online detection device and method. Background technique [0002] In the field of petroleum drilling and production engineering, the online quantitative detection of multiphase flow in oil and gas wells and pipelines is extremely challenging, and 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 station through pipelines, first perform three-phase separation, 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 production chara...

AI Technical Summary

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

Images