An electrode current type dual lateral resistivity logging instrument and method while drilling

Abstract

The invention discloses a while-drilling electrode current type dual lateral specific resistance logging instrument and a method. The while-drilling electrode current type dual lateral specific resistance logging instrument is mainly composed of three parts, namely a drill collar body, an electrode system and an electronic instrument body; and all electrodes of the electrode system are placed in an annular groove in the drill collar body in a 'sugarcoated haw clustering' mode, and the electronic instrument body is placed in an internal water hole of the drill collar body. According to the while-drilling electrode current type dual lateral specific resistance logging instrument and the method, stratum deep and shallow specific resistance curves are obtained in the modes of electrode currentdirect emission and electrode voltage and current measuring, and the stratum invasion characteristics are judged; and the while-drilling electrode current type dual lateral specific resistance logging instrument can measure in the well drilling process and can also measure in the drifting process after drilling, and the obvious advantage is achieved on specific resistance measuring of medium-high-resistance stratums.

Description

technical field [0001] The invention belongs to the field of oil and gas drilling, and in particular relates to an electrode current type dual lateral resistivity logging instrument and a method while drilling. Background technique [0002] Resistivity logging while drilling is the earliest logging-while-drilling method. According to the type of emission source, it can be divided into current type (ordinary resistivity, lateral resistivity) and electromagnetic wave type (electromagnetic wave resistivity, induction resistivity). Current resistivity logging while drilling is the earliest resistivity logging method while drilling. It has obvious advantages in the measurement of medium and high resistivity formations, but its development is slow. The research and application of electromagnetic wave resistivity logging while drilling is relatively late, starting in the 1980s In the early 1990s, resistivity logging while drilling has become the mainstream, but the dynamic range of...

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Problems solved by technology

[0005] The object of the present invention is to provide a kind of while-drilling electrode current type double lateral resistivity logging instrument and method, to overcome the low reliability of the electrode system of the electrode current type while drilling and the shallow detection depth and complex structure of the induced current type while drilling. To solve the problem of high cost, the present invention adopts the method of directly emitting current from the electrode and measuring the voltage and current of the electrode to obtain two kinds of resistivity curves, deep and shallow, to judge the invasion characteristics of the formation

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