Plane Wave Generator Array for Ahead-of-Bit Formation Imaging
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Solution Overview
Problem
Conventional drilling techniques fail to effectively detect lost circulation zones ahead of the drill bit, leading to fluid loss and potential well abandonment, as they lack the necessary beam directivity and penetration depth to visualize subsurface formations accurately.
Innovation Solution
A downhole wireline tool equipped with a plane wave generator (PWG) array that transmits and receives electromagnetic signals to generate reflection data, allowing for the creation of image data of the rock formation directly underneath the drill bit, enabling the detection of lost circulation zones and preventing fluid loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional techniques (inclined loop antennas or geosteering) are used to look ahead of the drill bit, then the drilling operator can visualize subsurface formations, but the beam directivity and penetration depth are insufficient to accurately detect lost circulation zones
Solution Approach 1:
The antenna system is divided into multiple discrete antenna elements arranged in an array configuration. Each element can be independently controlled to emit or receive electromagnetic signals at different angles and frequencies, enabling the system to synthesize focused beams with high directivity and extended penetration depth for accurate detection of lost circulation zones
Solution Approach 2:
The patent transitions from conventional two-dimensional visualization to three-dimensional imaging by utilizing a multi-element antenna array that can emit and receive electromagnetic signals in multiple directions simultaneously. This dimensional enhancement allows the system to achieve superior beam directivity and penetration depth, accurately detecting lost circulation zones in complex subsurface formations
2Loss of information
If conventional techniques are used to visualize subsurface formations, then some imaging capability is provided, but the imaging region lacks the necessary directivity and penetration depth
Solution Approach 1:
The multi-element antenna array serves multiple functions: it can transmit electromagnetic signals in various directions, receive reflected signals from different depths, synthesize focused beams, and generate three-dimensional images of subsurface formations. This multi-functionality compensates for the increased device complexity by providing comprehensive imaging capabilities with enhanced directivity and penetration depth
Solution Approach 2:
The patent replaces conventional mechanical or simple electromagnetic imaging methods with an advanced multi-element antenna array system that uses electronic beam forming and signal processing techniques. This substitution enables the system to achieve high directivity and penetration depth through electronic control rather than mechanical adjustment, improving visualization quality while managing system complexity
3Quantity of substance
If the drill bit drills into high permeability formations, then hydrocarbons can be extracted, but lost circulation occurs causing fluid loss and potential well abandonment
Solution Approach 1:
The multi-element antenna array is deployed ahead of the drill bit to detect lost circulation zones in high permeability formations before the drill bit encounters them. By identifying these zones in advance, the drilling operator can take preventive measures such as adjusting drilling parameters or injecting lost circulation materials, thereby preventing drilling fluid loss and avoiding well abandonment while maintaining hydrocarbon production capability
4Speed
If conventional antenna systems are used, then basic subsurface visualization is achieved, but beam directivity and penetration depth are insufficient
Solution Approach 1:
The antenna system is segmented into multiple independent elements that can simultaneously transmit and receive electromagnetic signals. This segmentation enables parallel signal processing, increasing the speed of data acquisition while improving detection reliability through multiple measurement channels that can be processed to filter noise and enhance signal quality
Solution Approach 2:
The multi-element antenna array incorporates feedback mechanisms where received signals from each element are processed and used to adjust the transmission signals for subsequent measurements. This feedback loop enables the system to optimize beam direction and focus, enhancing both the speed of detection and the reliability of lost circulation zone identification by continuously refining the imaging process
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
The PWG tool provides enhanced beam directivity and penetration depth, enabling accurate visualization of subsurface formations up to 15-30 meters ahead, allowing operators to take preventative measures against lost circulation and ensure wellbore stability.
Implementation Method 1
a plane wave generator (PWG) tool configured for being deployed downhole inside a wellbore for formation evaluation and generation of reflection data; wherein the PWG tool includes a beam forming network (BFN) architecture and a plurality of antenna elements mounted to a base of the PWG tool and configured to transmit and receive electromagnetic signals
Implementation Method 2
the plurality of antenna elements mounted to a base of the PWG tool and configured to transmit and receive electromagnetic signals
Data Source
AI summary
A system for looking ahead of a drill bit includes a plane wave generator (PWG) tool deployed downhole inside a wellbore for formation evaluation and generation of reflection data, a power source providing electric power to the PWG tool for the formation evaluation and the generation of the reflection data, a surface control system receiving the reflection data from the PWG tool and generating image data of a subsurface rock formation based on the received reflection data, and a wireline that electrically couples the PWG tool to the power source and communicatively couples the PWG tool to the surface control system. The PWG tool includes a beam forming network (BFN) architecture and a plurality of antenna elements mounted to a base of the PWG tool to transmit and receive electromagnetic signals.