Transient electromagnetic sleeve damage three-dimensional imaging method

Abstract

The invention provides a transient electromagnetic sleeve damage three-dimensional imaging method, which comprises the following steps: carrying out region division on sleeve damage data to enable thedata to be distributed in a specified region; performing scaling algorithm correction on the depth data; performing linear interpolation on the depth data; respectively selecting four curves from thedata measured by probes in four different directions, and storing the data at fixed named positions; separating the information of an inner wall and an outer wall of the measured curve; placing innerand outer wall information of the selected curve in a phase corresponding to the space according to the orientation of a probe of the curve; performing Hermite interpolation on the curve data in a three-dimensional space; and performing three-dimensional mesh generation on the data, and performing color spreading according to the size of the data, so that the size of the data is reflected throughcolor change. According to the transient electromagnetic sleeve damage three-dimensional imaging method, three-dimensional display of the casing damage is achieved, and the real form and position ofthe casing damage can be visually reflected.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a three-dimensional imaging method for transient electromagnetic casing damage. Background technique [0002] With the deepening of oil and gas development in production wells, most oilfields in my country have entered the middle and late stages of exploration and development. Production well logging technology based on transient electromagnetic theory can obtain production well casing damage, which is very important for the sustainable development of oilfields. is of great significance. [0003] Transient electromagnetic detection uses a non-contact measurement method, which is suitable for logging in complex wellbore environments. However, because it displays the thinning, shrinkage, corrosion and leakage damage of the pipe wall through the magnitude of the induced electromotive force, it cannot fully and intuitively reflect the change of the inner diameter of the ...

AI Technical Summary

Problems solved by technology

However, because it displays the thinning, shrinkage, corrosion and leakage damage of the pipe wall through the magnitude of the induced electromotive force, it cannot fully and intuitively reflect the change of the inner diameter of the casing like a caliper. Described in two dimensions, cannot accurately interpret damage results

Since this technology cannot accurately, intuitively, and three-dimensionally display the spatial position of casing damage, it is necessary to conduct in-depth research on the interpretation method and establish an efficient TEM interpretation and inversion method

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