Thin interlayer identification method using logging-while-drilling data in highly-deviated well environment

Abstract

The invention discloses a thin interlayer identification method using the logging-while-drilling data in a highly-deviated well environment. The method comprises the steps of 1, obtaining and pre-pressing the logging data through a logging-while-drilling tool; 2, performing analog simulation by utilizing a forward simulation program, establishing a layer thickness-inclination angle interpretation chart, and identifying an interface position, a layer thickness and a stratum apparent inclination angle by utilizing a curve feature-chart scale joint method; 3, according to an interface identification result and a layer thickness identification result, layering the logging data, completing the stratum interface division, and obtaining the layered data; 4, establishing a layer thickness-inclination angle-resolution correction chart, performing resolution correction on the logging data, and obtaining the corrected resistivity data; and 5, constructing a square wave type layered resistivity curve according to the layered data, the inclination angle data, the corrected resistivity data and the well track logging data. According to the scheme, the accurate identification of the thin interlayer is realized, and the identification result of the thin interlayer can be visually displayed.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for identifying thin interlayers using logging-while-drilling data in a highly deviated well environment. Background technique [0002] Electromagnetic wave logging while drilling is one of the main logging-while-drilling projects. Since the logging-while-drilling method has a shorter drilling time and can provide more abundant logging curves, the electromagnetic wave logging while drilling It has been widely used in drilling and logging. In the revolutionary era of the development of LWD technology in the 1980s, many companies successively established and launched their own leading LWD (Logging While Drilling, logging while drilling) / MWD (Measurement While Drilling, measurement while drilling) products, The design process and quality of the instrument have been effectively guaranteed; in 1983, Teleco first launched a 2MHz RGD type resistivity measurement a...

AI Technical Summary

Problems solved by technology

At present, conventional logging identification methods are mostly used for the identification of interlayers. Due to the low vertical resolution of logging curves, there are certain difficulties and errors in the identification of interlayer types and thickness, and it is even more difficult to accurately identify thin interlayers.

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