Device and method for while-drilling detection of formation interface through azimuthal resistivity

Abstract

The invention discloses a device and method for while-drilling detection of a formation interface through azimuthal resistivity. The device comprises a non-magnetic drill collar, a circuit unit, a plurality of antennas and antenna tuning units corresponding to the antennas, wherein the non-magnetic drill collar serves as a carrier of the whole device and is provided with a compensation resistivity detection point. The circuit unit is installed inside the non-magnetic drill collar. The antenna tuning units are distributed on the outer circular surface of the non-magnetic drill collar and connected with the circuit unit. The method includes common resistivity measurement and azimuthal resistivity measurement, the distance between the device and the formation interface is calculated through the azimuthal resistivity measured value, previous real-time geological data are provided for well drilling, and the purpose of optimizing the well drilling quality is realized.

Description

technical field [0001] The invention relates to a device and method for geological exploration using azimuth resistivity while drilling to detect formation boundaries in petroleum exploration drilling engineering. Background technique [0002] In drilling engineering, drilling workers and geological engineers need to keep abreast of the working status of downhole tools, the shape of wellbore trajectory, and the parameters of formation and bottomhole environment. Real-time geosteering is very important for oil and gas exploration. The purpose of geosteering is to keep the drill bit traveling in the oil layer as much as possible, which requires real-time knowledge of the distance between the bottom hole tool and the formation interface. [0003] Conventional electromagnetic wave resistivity logging tools use a longitudinal coil system arranged along the tool axis (that is, the magnetic dipole direction of the coil is coaxial with the tool) to measure formation resistivity. Th...

AI Technical Summary

Problems solved by technology

More importantly, conventional electromagnetic wave resistivity is difficult to determine the distance from the highly deviated or horizontal wellbore to the boundary of the upper and lower surrounding rocks, especially it is difficult to determine the direction

The limitations of conventional electromagnetic wave resistivity instruments show that they cannot meet the needs of precise geosteering and formation evaluation

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