Transmitter of cross-hole electromagnetic logging tool and its transmitting antenna

Abstract

The invention provides a transmitter of a cross-hole electromagnetic logging tool transmitter with strong stability, high transmitting efficiency and strong quality factor of the transmitting antenna and its transmitting antenna, wherein the transmitting antenna includes an antenna assembly arranged in a glass fiber reinforced plastic shell of the transmitter The antenna assembly includes a magnetic core, which runs through the core shaft arranged inside the magnetic core, covers the antenna skeleton arranged outside the magnetic core, and a transmitting coil and a correction coil wound on the antenna skeleton in a segmented manner; the separation of the magnetic core The upper fixing sleeve of the magnetic core and the lower fixing sleeve of the magnetic core arranged at both ends are locked in the antenna frame; the transmitting coil and the correction coil are symmetrically wound on the antenna frame by a single layer of multi-strand silver-plated enameled wire. The transmitter includes a glass fiber reinforced plastic shell, is arranged inside the glass fiber reinforced plastic shell as the transmitting antenna described in any of the above schemes, and is arranged on an upper sealing body and a lower sealing body at both ends of the glass fiber reinforced plastic shell; between the lower sealing body and the transmitting antenna, there is a Pre-tightening device, the free end of the lower sealing body is provided with a balance system.

Description

technical field [0001] The invention relates to oil and gas exploration technology, in particular to an interwell electromagnetic logging instrument transmitter and its transmitting antenna. Background technique [0002] With the development of exploration technology, determining the connectivity of formation sand bodies, finding missing oil layers, monitoring macroscopic displacement effects, designing infill wells, and improving the accuracy of reservoir simulation have become the key tasks in the middle and late stages of oilfield development. The cross-well electromagnetic logging instrument used in the project has poor reliability, large antenna power loss, small radial detection range, and complicated construction process, which can no longer meet the requirements of the above-mentioned applications. [0003] Interwell electromagnetic logging is to measure the resistivity distribution between wellbores, and it is an important frontier in the development of contemporary...

AI Technical Summary

Problems solved by technology

[0002] With the development of exploration technology, determining the connectivity of formation sand bodies, finding missing oil layers, monitoring macroscopic displacement effects, designing infill wells, and improving the accuracy of reservoir simulation have become the key tasks in the middle and late stages of oilfield development. The cross-well electromagnetic logging instrument used in the project has poor reliability, large antenna power loss, small radial detection range, and complicated construction process, which can no longer meet the requirements of the above applications.

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