LWD Tilted Antennas for Deep Well Detection
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Solution Overview
Problem
Existing drilling techniques for steering new boreholes relative to existing wells are limited by requiring multiple logging runs, disrupting the drilling process, and often have restricted range or infeasible magnetization levels, making them inadequate for efficient geosteering.
Innovation Solution
The development of logging-while-drilling (LWD) systems with tilted antennas and multi-component electromagnetic logging tools that enable resistivity logging and deep anomaly detection, allowing for effective geosteering without disrupting drilling operations by determining the position, orientation, and distance of existing wells, and enhancing detection range using ferromagnetic fluid treatments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wireline tools are lowered to existing wells for sensing, then detection capability is improved, but drilling operations are disrupted and time is lost
Solution Approach 1:
The existing well casing serves as the transmitter itself, generating the electromagnetic signal without requiring external wireline tools to be lowered. The logging-while-drilling tool in the new borehole autonomously detects the signal and determines the position of the existing well, eliminating the need for intervention in the existing well and allowing continuous drilling operations.
2Device complexity
If passive magnetization of target well casing is used, then transmitter requirement is eliminated, but very strong magnetization levels must be maintained making it infeasible
Solution Approach 1:
The invention changes the operational mode from passive magnetization (requiring extremely strong, maintained magnetic fields) to active electromagnetic signal generation at feasible power levels. The active transmitter can be turned on and off as needed, and the signal strength can be adjusted to appropriate levels for detection without requiring unrealistic magnetic field maintenance.
3Measurement precision
If existing techniques are used for well steering, then some detection capability is achieved, but range is limited and multiple logging runs are required
Solution Approach 1:
The logging-while-drilling tool continuously detects electromagnetic signals from the existing well casing throughout the drilling process, enabling real-time determination of the existing well's position, orientation, and depth. This continuous detection eliminates the need for multiple separate logging runs and extends the effective detection range through sustained signal acquisition.
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
Enables precise geosteering without interrupting drilling operations, allowing for accurate detection and steering of new boreholes relative to existing wells at distances of 50-100 feet, with enhanced visibility using ferromagnetic fluid treatments, thus improving the efficiency and range of borehole placement.
Implementation Method 1
an electromagnetic logging tool 638 that transmits electromagnetic signals through the formation and measures the response to detect the existing well casing
Implementation Method 2
enhancing detection range using ferromagnetic fluid treatments
Data Source
AI summary
Various logging-while-drilling (LWD) systems and methods provide resistivity logging coupled with deep detection of elongated anomalies at acute angles, enabling effective geosteering without disrupting drilling operations and without requiring intervention in the operations of the existing well. One LWD system embodiment employs a tool having tilted antennas as the transmitter and the receiver, where at least one of the antennas is placed in the vicinity of the bit, making it possible to detect existing wells at distances of 50-100 feet. In some cases, the detection distance is increased by enhancing the visibility of the existing well using a contrast fluid treatment on target well, either to fill the bore or to surround the well with treated cement or fluids that invade the formation. At least one inversion method separates the inversion of formation parameters from the inversion of parameters specifying distance, direction, and orientation of the existing well.