Single Receiver Antenna for Deep Resistivity Logging
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Solution Overview
Problem
Current resistivity logging tools in petroleum drilling face limitations in deep and ultra-deep drilling due to the short penetration depth of high-frequency signals, requiring multiple receiver antennae to correct mandrel or collar effects, which increases costs and complexity, while deep or ultra-deep sensing techniques necessitate lower frequencies and greater distances, making it inefficient to obtain good quality azimuthal resistivity measurements.
Innovation Solution
A single receiver antenna is used near the transmitter to achieve good quality azimuthal resistivity measurements at deeper distances during deep or ultra-deep drilling, utilizing lower RF transmitter frequencies to enhance signal penetration and reduce the need for multiple antennae, thereby simplifying the logging tool configuration and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple receiver antennae are used to correct mandrel or collar effects, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the mandrel or collar effects by using a single receiver antenna positioned at an optimized distance from the transmitter, rather than using multiple antennas to measure and correct these effects. The single antenna configuration removes the complexity of multiple antenna interactions while maintaining measurement accuracy through proper positioning and signal processing.
Solution Approach 2:
The single receiver antenna is designed to perform multiple functions: it receives electromagnetic signals from the transmitter, measures azimuthal resistivity, and inherently compensates for mandrel or collar effects through its optimized positioning. This multi-functional design eliminates the need for separate correction mechanisms required by multiple antenna systems.
2Length of stationary object
If lower RF frequencies are used for deep sensing, then signal penetration depth is improved, but the efficiency of obtaining good quality azimuthal resistivity measurements deteriorates
Solution Approach 1:
The patent changes the frequency parameter of the electromagnetic signals to lower RF frequencies, which increases the penetration depth into the formation. This parameter change enables deep sensing while maintaining measurement quality through optimized signal processing and single antenna positioning, resolving the contradiction between penetration depth and measurement efficiency.
3Length of stationary object
If greater distances between transmitter and receiver are used for deep sensing, then penetration depth is improved, but measurement quality for azimuthal resistivity deteriorates
Solution Approach 1:
The patent employs dynamic signal processing techniques that adapt to the increased distance between transmitter and receiver. The system dynamically adjusts signal parameters and processing algorithms to maintain measurement quality despite the greater separation distance, enabling deep sensing without sacrificing azimuthal resistivity measurement accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for more extensive mapping of strata surrounding the wellbore, improving the accuracy of formation characterization and drill bit directionality, enabling more effective geosteering and resource extraction by enhancing the penetration depth of resistivity signals and reducing the complexity of the logging tool configuration.
Implementation Method 1
one or more antennae for transmitting an electromagnetic signal into the formation at a measurement depth
Implementation Method 2
one or more antennae for receiving a formation response
Data Source
AI summary
A system and a method for evaluating a subterranean earth formation include a logging tool locatable in a wellbore dispose in the formation. The logging tool may include a transmitter antenna and a single receiver antenna. The transmitter antenna is configured to transmit a first electromagnetic signal into the subterranean earth formation. The system further includes a processor and a non-transitory memory device. The memory device includes instructions that cause the processor to control a current and a voltage sourced to the transmitter antenna, receive, via the single receiver antenna, a second electromagnetic signal emitted by the subterranean earth formation in response to receiving the first electromagnetic signal, and determine a resistivity of the subterranean earth formation based on the second electromagnetic signal.