Array-type lateral well logger with different layering powers

Abstract

The ivnention relates to an array logging tool in the side direction with various layering capabilities. It includes a multi-signal source, multiple groups of shielded electrodes, a monitoring device, a main electrode group, voltage measuring and processing set, and main electrode current detecting and processing set. The multi-signal source produces multiple working signals with different frequencies. Each group of shielded electrodes sends working signal to different layer of earth, meanwhile forms focusing electric field. The monitoring device receives and magnifies first working signal transmitted by multiple groups of shielded electrodes. The main electrode group includes a central electrode and multiple pairs of electrodes arranged outwards for signal refocusing. One measurement in the invention can obtain 12 apparent resistivity curves that describes the geology in detail, explains layers of earth in the orientation analysis, gives quantitative explanations to the problems of layers and alternate laminar layers.

Description

technical field [0001] The invention relates to an array lateral logging tool with multiple stratification capabilities, capable of obtaining logging curves with multiple stratification capabilities at one time. Background technique [0002] Lateral logging, also known as current focusing logging, belongs to electrical logging and is a major method in oilfield geophysical exploration. [0003] Under normal circumstances, the instrument is hoisted into the well through the armored cable and supplies power to the formation, and a return electrode is set at an infinity point away from the power supply electrode (actually, the return electrode is only more than 20 meters away from the power supply electrode). When there is only one power supply electrode, the emission current is not focused and the equipotential surface is spherical, and the logging method is lateral logging. [0004] When there are shielding electrodes above and below the transmitting electrode, the shielding ...

AI Technical Summary

Problems solved by technology

For example, the array lateral logging tool developed by Schlumberger Logging Company in France can obtain six curves with six detection degrees, but only has one layering capability, so it cannot measure geological thin layers, so it cannot analyze comprehensively and accurately Distribution of oil layers

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