Drilling Auxiliary System for EM Data Transmission and Casing Detection
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Solution Overview
Problem
Current drilling technologies face inefficiencies in downhole EM data transmission and casing ranging, with low data transmission rates and complex, costly operations, particularly due to weak EM signal strength near the ground surface and limited detection ranges.
Innovation Solution
Establishing electrical connections between drilling wells or branches using conductive wires and circuit connections to form enhanced current or voltage loops, which improve data transmission efficiency and enable more accurate casing detection by increasing signal strength and reducing energy dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mud-pulse telemetry system is used for data transmission, then the system can be applied in a wide range of drilling wells, but the data transmission rate is low (less than 8 bit per second)
Solution Approach 1:
The patent replaces the mechanical mud-pulse transmission system with an electromagnetic field-based transmission system. By using EM telemetry technology with insulating rings and power sources to generate electromagnetic fields for data transmission, the system achieves significantly higher data transmission rates while maintaining wide applicability in drilling operations.
2Productivity
If EM telemetry technology is used to improve transmission rate, then the data transmission rate increases, but the EM signal strength near the ground surface becomes very small requiring extremely high sensitivity receivers
Solution Approach 1:
The patent introduces conductive wires as intermediaries to guide electromagnetic signals from the downhole to the surface. These wires act as transmission media that carry the EM signals directly, preventing signal attenuation in the formation and ensuring strong signal strength at the surface without requiring extremely sensitive receivers.
Solution Approach 2:
The patent replaces the formation-based EM transmission path with a wire-based transmission path. By substituting the natural formation medium with controlled conductive wires, the system maintains strong signal strength throughout the transmission path, eliminating the signal weakness problem at the surface.
3Length of stationary object
If transmission line is placed in existing well for casing ranging, then the detection distance is long, but the operation becomes complicated and expensive
Solution Approach 1:
The patent makes the drilling well pipe serve multiple functions: it acts as both the drilling tool and the transmission line for casing ranging. The existing drill pipe or casing is utilized as the conductive medium for EM transmission, eliminating the need for separate transmission lines and reducing operational complexity while maintaining long detection distances.
Solution Approach 2:
The patent enables the drilling well itself to provide the transmission function needed for casing ranging. The drill pipe or casing automatically serves as the conductive path for EM signals, making the system self-sufficient and eliminating the need for additional external transmission lines or complex installation procedures.
4Ease of operation
If transmitter and receiver are both placed on drilling well pipe for casing ranging, then the operation is simple, but the detection range is greatly reduced
Solution Approach 1:
The patent uses the conductive wire or drill pipe as an intermediary that extends the effective detection range. By placing the transmitter in the drilling well and using the wire/pipe as the transmission medium, the system can detect casings at much greater distances while keeping both devices on the drilling well, maintaining operational simplicity.
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
Significantly enhances data transmission rates and simplifies casing detection operations, achieving higher efficiency and cost savings by forming large loops that reduce energy loss and increase signal intensity for both data transmission and casing location determination.
Implementation Method 1
a low frequency alternative current is applied on both ends of the insulation section to generate the EM field
Implementation Method 2
the downhole data can be acquired by measuring the voltage between terminal A and B using the signal receiver 10
Data Source
AI summary
The present invention provides a drilling auxiliary system, which establishes one or more links among multiple wells or among different branches of the same well. When the present invention is applied to the EM data transmission, it can significantly reduce unwanted electric energy consumption in the formation, thus effectively improve data transmission efficiency. When the present invention is applied to the casing detection, it can achieve a large detection range and greatly simplify the complexity of the operation, thereby saving costs.