Radioisotope logging tracer underground screening device

Abstract

The invention discloses a radioisotope logging tracer underground screening device which comprises a device body, an upper isotope bin, a middle isotope bin and a lower isotope bin. The upper isotope bin, the middle isotope bin and the lower isotope bin are arranged in the device body. The upper isotope bin, the middle isotope bin and the lower isotope bin are sequentially arranged from top to bottom in the vertical direction, that is, the middle isotope bin is located between the upper isotope bin and the lower isotope bin, and the upper isotope bin is located at the upper part of the middle isotope bin; the tracer most matched with the specific gravity of the injected water can be screened out, the problem that isotope logging data are unqualified due to the fact that the specific gravity of the tracer is not matched is solved, and the method is particularly significant to water injection and fine logging of different logging blocks and different mineralization degrees of an oil field. The breakage rate and the isotope desorption rate of the tracer agent are detected by replacing an expensive and huge ultrahigh pressure generating device during ground detection with the high pressure and the real temperature environment of underground injected water, and the problems of radioactive isotope contamination and data distortion are solved.

Description

Technical field [0001] The present invention relates to the field of oilfield logging tool technology, in particular to a radioactive isotope logging tracer downhole screening device. Background [0002] Water injection is the basis of stable production in oilfields, is an important means to improve the effect of water injection development and sustained stable production of oilfields, and it is precisely because this injection profile logging is the core content of water injection exploitation and water flooding, and its logging data is to monitor the injection dynamics of single wells, reveal the contradictions between layers and within layers, adjust the injection profile (such as hierarchical injection and adjustment section, water plugging and regulation, acidification, fracturing) to provide scientific basis; provide logging data for the adjustment of well groups and regional injection and production relationships; through the study of injection profile logging and the ana...

AI Technical Summary

Problems solved by technology

The optimal situation for isotope injection profile logging is that the specific gravity of the isotope is the same as that of the injected water, and the tracer is suspended in the water. Otherwise, the tracer will float and sink, which will cause the distortion of the logging data. Well data is unqualified

However, the water injection methods of each reservoir in the oilfield are different, the water quality varies greatly, and the salinity of groundwater in different regions is also very different, and even the proportion of water in the same well will change with the depth and temperature, so the existing isotope The method used by well logging tracer manufacturers to sort the specific gravity of tracers on the ground is difficult to take into account the differences in the specific gravity of injected water in different logging blocks and different well depths, and it is difficult to meet the current logging needs of layered water injection and fine water displacement in most oil fields

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