Halliburton Energy Services, Inc.

Chao-Fu Wang

Li Pan

Rencheng Song

Jin Ma

Burkay Donderici

Ahmed Elsayed Fouda

Wei Hsuan Huang

A transmitter/receiver for use in a dielectric logging tool. The transmitter/receiver generally includes a housing, a septum, a first antenna, and a second antenna. When operated as a transmitter, a first and second electromagnetic signal are emitted by the first and second antenna, respectively. The housing and septum are shaped to combine the first and second electromagnetic signals into a combined signal having varying orientations depending on the phase difference between the first and second electromagnetic signals. When operated as a receiver, an incoming electromagnetic signal is divided into a first and second component signal. The first and second component signals are directed to the first and second antennas, respectively, where they are converted into first and second electrical signals. The first and second electrical signals can then be combined, by adding or subtracting the signals for example, to produce a resultant electrical signal corresponding to incoming electromagnetic signals having different orientations.

Bi-mode high frequency dielectric tool

Methods and tools for modifying magnetic tilt angle using a magnetically anisotropic material are disclosed. An electromagnetic logging tool includes an antenna coil oriented at a physical tilt angle relative to a longitudinal axis of the tool and a magnetically anisotropic material that modifies a magnetic tilt angle of the coil relative to the physical tilt angle a coil tilted at a physical tilt angle relative to an axis of the tool.

Modifying magnetic tilt angle using a magnetically anisotropic material

Electromagnetic sensors which provide high coupling gain between the transmitter and receiver of a dielectric tool include a conductive pad having a cavity filled with dielectric filler, and an electrical conductor that provides electrical current to a conductive feeder placed inside the dielectric filler. During operation, current is fed to the conductive feeder to thereby produce an electric monopole that feeds electromagnetic power into the cavity, which then radiates out into the formation as electromagnetic signals. Because of the design of the electromagnetic sensors, the transmitter/receiver coupling gain and SNR are optimized over the entire range of the dielectric constant (i.e., 5&#x2264;&#x3f5;&#x2264;80).

Electromagnetic sensor for a downhole dielectric tool

Hybrid inversion processing techniques are implemented that result in improved speed and accuracy of determining formation properties using log data, for example, from an multi-component induction logging tool. Logging data relating to the formation of interest is obtained and used as an input. High frequency noise is then removed from the logging data and bed-boundary determination is performed using the logging data. An adaptive low pass filter is applied to the logging data and the logging data is inverted. The inverted logging data is correct and enhanced by determining one or more weights based on one or more quality indicators. The inverted logging data may then be visually interpreted and used to adjust one or more drilling parameters.

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Singapore, Singapore

Chao-Fu Wang