Method, system and device for obtaining wellbore fluid density and medium

Abstract

The invention provides a method, a system, a device and a medium for obtaining wellbore fluid density, and the method comprises the following steps: collecting a burst peak counting rate curve in neutron lifetime logging capture time spectrum data, and obtaining a burst peak attenuation rate; constructing a scale relationship between wellbore fluid density data obtained based on output profile logging and the burst peak attenuation rate, and obtaining a conversion relationship between the burst peak attenuation rate and fluid density; a wellbore fluid density curve is obtained based on the conversion relation between the burst peak attenuation rate and the fluid density; according to the method, the capture time spectrum information is mined, the characteristic value of the neutron lifetime logging capture spectrum data is extracted, and the relationship between the neutron lifetime logging and the fluid density is constructed, so that the aim of quantitatively evaluating the fluid density in the shaft is fulfilled; a new application field of neutron lifetime logging information is developed, key parameters which can only be recorded through output profile logging in the past are obtained, and technical support is provided for dynamic research of oil and gas reservoirs.

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