Measurement method of water absorption profile of water injection well based on natural gamma baseline

Abstract

The invention provides a water injection well water injection profile measuring method based on a natural gamma ray baseline. The water injection well water injection profile measuring method comprises the following steps: according to the natural gamma ray baseline of a water injection well, the radioactive intensity of an isotopic tracer is selected; according to the radioactive intensity of the isotopic tracer, a corresponding target isotopic tracer is matched, and is released into the water injection well; a downhole instrument is adopted for rapidly tracing the target isotopic tracer, and an isotope gamma peak curve is acquired; according to the natural gamma ray baseline and the isotope gamma peak curve, a water injection profile of the water injection well is acquired. According to the water injection well water injection profile measuring method provided by the invention, the radioactive intensity of the isotopic tracer is selected according to the natural gamma ray baseline of the water injection well, so as to meet the requirement on the amplitude of a radioactive intensity difference between the natural gamma ray baseline and the isotope gamma peak curve during the measurement of the water injection well having an abnormal amplitude of the natural gamma ray baseline.

Description

technical field [0001] The invention relates to the technical field of radioactivity logging, in particular to a method for measuring water absorption profiles of water injection wells based on natural gamma ray baselines. Background technique [0002] With the passage of oil field development time, the pressure of the oil layer gradually decreases. In order to ensure the long-term stable development of the oil field, it is necessary to supplement energy to the formation to maintain the pressure of the oil layer. At present, the method of injecting water into the oil layer is mainly used to achieve the purpose of maintaining the pressure of the oil layer. Therefore, in addition to drilling a batch of oil production wells during oil field development, a batch of water injection wells must also be drilled. In order to understand the water injection status of the water injection well, it is necessary to measure the water absorption profile, so as to know the absolute water inj...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method for measuring the water absorption profile of water injection wells based on natural gamma ray baselines, which is used to solve the problem in the prior art that water injection wells with high and abnormal natural gamma ray baselines cannot use isotope water absorption profile logging to accurately determine the water absorption of formations

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