A Method for Measuring Apparent Resistivity for Measurement While Drilling

Abstract

The invention relates to an apparent resistivity measurement method, belongs to the technical field of under-shaft detection, and particularly relates to an apparent resistivity measurement method used in measurement while drilling. Three exciting coils T1, T2 and T3 are utilized and can be combined into nine kinds of working modes, each working mode can obtain totally nine measurement values which include three electric buckle electrical resistivity (B1, B2 and B3), four azimuthal resistivity (Az1, Az2, Az3 and Az4), one equivalent ring electrode resistivity and one drill resistivity, that is, totally 81 apparent resistivity curves can be obtained in a work state, curves which accord with requirements are selected according to design requirements and wellbore effects to be regarded as a basis for drilling decision making or stratum evaluation in a later period.

Description

technical field [0001] The invention relates to an apparent resistivity measurement method, which belongs to the technical field of downhole detection, in particular to an apparent resistivity measurement method for measurement while drilling. Background technique [0002] Resistivity logging is the earliest and most commonly used method in logging methods. So far, it still plays an irreplaceable role in dividing drilling geological sections and judging lithology. The azimuth resistivity borehole wall imaging technology while drilling is developed on the basis of traditional wireline measurement technology, and it is an imaging measurement method that can measure the resistivity of formations in different azimuths around the wellbore in real time during the drilling process. [0003] With the continuous improvement and extensive application of drilling technologies for horizontal wells, extended-reach wells, and three-dimensional multi-target wells, rotary steerable closed-l...

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Problems solved by technology

Since the device is integrated with the steering motor, it is mainly used for sliding steerable drilling, and cannot be used in combination with rotary steerable tools, and the azimuthal resistivity resolution is low, so it does not yet have the ability to image the resistivity borehole wall

[0008] The multi-component azimuth electromagnetic wave resistivity imaging instrument disclosed in the invention patent published in China (application publication number: 104929622A), and the azimuth electromagnetic wave resistivity measurement while drilling disclosed in the invention patent published in China (application publication number: 104727812A) The device and its measurement method are limited by the measurement principle and method, that is, the transmission resistivity measurement is adopted, and the conduction resistivity measurement method cannot realize resistivity borehole wall imaging, and is not suitable for high-resistivity formations

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