Electromagnetic Ranging Source for Extended-Range Relief Well Drilling
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Solution Overview
Problem
Existing techniques for tracking and drilling boreholes relative to existing boreholes face limitations due to the restricted range of ferromagnetic or conductivity-based methods, which are inadequate during drilling when well control issues like pressure kicks or blowouts occur, especially before the borehole is cased and equipped with a casing beacon.
Innovation Solution
An electromagnetic ranging system using a drill string with a ferromagnetic core and current-carrying windings to generate a magnetic field, powered by a downhole source, such as a fluid flow-powered electrical generator, to guide the drilling of a relief well by establishing a detectable magnetic field for longer distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ferromagnetic or conductivity-based ranging techniques are used, then the system can track boreholes relative to existing boreholes, but the operating range is undesirably limited
Solution Approach 1:
The patent replaces ferromagnetic and conductivity-based ranging methods with electromagnetic induction technology. The electromagnetic ranging source generates electromagnetic fields that induce currents in the casing beacon, creating a detectable signal over extended distances. This substitution of the physical mechanism enables ranging beyond the limited range of traditional ferromagnetic methods while maintaining tracking accuracy.
Solution Approach 2:
The patent changes the physical parameters of the ranging system by introducing electromagnetic field frequency and amplitude as controllable parameters. The electromagnetic ranging source operates at specific frequencies to optimize signal penetration and detection range, allowing the system to extend its operating range while maintaining measurement precision through parameter optimization.
2Length of stationary object
If a casing beacon with power supply is installed in the reference borehole, then the ranging range is extended, but the borehole must be cased before the beacon can be installed
Solution Approach 1:
The patent inverts the traditional sequence by placing the electromagnetic ranging source in the drill string instead of installing a beacon in the casing afterward. This allows the ranging source to be deployed immediately during the drilling operation, eliminating the delay associated with waiting for casing installation and beacon deployment.
Solution Approach 2:
The patent performs preliminary action by equipping the drill string with the electromagnetic ranging source before the drilling operation begins. This enables ranging functionality to be available from the start of drilling, allowing real-time tracking and immediate response to well control issues without waiting for subsequent casing and beacon installation.
3Ease of operation
If the drill string is used for ranging, then the source is available during drilling, but techniques relying on ferromagnetic or conductivity properties have limited range
Solution Approach 1:
The patent replaces the ferromagnetic and conductivity properties of the drill string with an active electromagnetic induction system. The electromagnetic ranging source generates electromagnetic fields that can penetrate formation and casing materials, enabling long-range detection while the drill string is in position. This substitution maintains ease of operation during drilling while extending the ranging range beyond the limitations of passive ferromagnetic methods.
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 accurate and extended-range guidance for drilling relief boreholes to intersect and control well control issues effectively, allowing for timely injection of kill fluids to manage formation fluid influx and maintain borehole integrity.
Implementation Method 1
one or more current-carrying windings around the core to induce a magnetic field between the poles
Implementation Method 2
a downhole power source, such as a fluid flow-powered electrical generator
Data Source
AI summary
An electromagnetic ranging source includes: a tubular body having a circumference; a ferromagnetic core conforming to the tubular body and extending at least halfway around the circumference to define a gap with circumferentially-spaced poles; one or more current-carrying windings around the core to induce a magnetic field between the poles; and a downhole power source that drives the one or more current-carrying windings. A related method includes: equipping a first drill string with such an electromagnetic ranging source; extending a first borehole with the first drill string; assembling a second drill string with sensors; and drilling a second borehole while using said sensors to guide the second drill string relative to the first borehole.