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An antenna for an electromagnetic probe for investigating geological formations and its applications

A technology of geological structure and antenna, which is applied in the direction of electric/magnetic detection for well logging and detection with electromagnetic waves, etc., can solve the problems of "crosstalk" that cannot be performed and affect measurement accuracy, achieve good measurement accuracy, and improve electromagnetic insulation sex, eliminate parasitic effects

Inactive Publication Date: 2009-09-23
PRAD RES & DEV LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, parasitic electric dipoles normal to the aperture affect measurement accuracy
Furthermore, crosstalk between the two polarizations is significant due to parasitic electric dipoles, and "cross-fire" measurements cannot be performed (i.e., transmitter and receiver in endfire mode)

Method used

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  • An antenna for an electromagnetic probe for investigating geological formations and its applications
  • An antenna for an electromagnetic probe for investigating geological formations and its applications
  • An antenna for an electromagnetic probe for investigating geological formations and its applications

Examples

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Embodiment Construction

[0075] figure 1 A typical onshore oil and gas well location and surface equipment SE above the oil and gas geological formation GF are schematically shown after drilling operations have been carried out. At this stage, ie before the casing string is run and before the cementing operations are carried out, the wellbore is an open hole WBH filled with the fluid mixture DM. Fluid mixture DM is usually a mixture of drilling fluid and drilling mud. In this example, the surface equipment SE comprises an oil rig OR and a surface installation SU for deploying a logging equipment TL in a wellbore. The surface device may be a vehicle connected to a logging tool by a line LN. Furthermore, the surface device comprises suitable means DD for determining the depth position of the logging tool relative to the surface. The logging tool TL includes various sensors and provides various measurements related to the hydrocarbon geological formation GF and / or the fluid mixture DM. These measurem...

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Abstract

An antenna 3 of an electromagnetic probe 1 used in investigation of geological formations GF surrounding a borehole WBH comprises a conductive base 31 and a first antenna element 32. The conductive base 31 comprises an opened non-resonant cavity 33. The first antenna element 32 is embedded in the cavity 33 and goes right trough the cavity. The first antenna element 32 is comprised of a center-split half-coaxial wire so as to define a symmetrized antenna radiation pattern.

Description

technical field [0001] The present invention relates to a crossed dipole antenna and an electromagnetic probe comprising such an antenna for measuring electromagnetic properties of a subterranean formation within a limited zone surrounding an open hole well. Another aspect of the invention relates to a logging tool for performing logging of an open hole in a subterranean formation. A particular application of the probe and logging tool according to the invention relates to the oilfield service industry. Background technique [0002] Well logging devices for measuring electromagnetic properties (eg dielectric constant) of geological formations are known eg from US 3,849,721, US 3,944,910 and US 5,434,507. A logging device includes a transmitter and a spaced apart receiver mounted within a pad that abuts against a borehole wall. Microwave electromagnetic energy is transmitted into the formation, and the energy that has propagated through the formation is received at the rece...

Claims

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Application Information

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IPC IPC(8): G01V3/30
CPCG01V3/30
Inventor 马蒂尼·西蒙马丁·吕林
Owner PRAD RES & DEV LTD
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