Wireless Telemetry via Tool Body Deflection
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Solution Overview
Problem
Conventional downhole telemetry methods for oil and gas wells are costly and power-intensive, particularly due to the use of pressure transducers, which are expensive and require holes in tubulars, making them unsuitable for low-margin unconventional oil and gas well operations.
Innovation Solution
The method employs a low-cost strain gauge to measure mechanical deformation caused by fluid pressure changes in downhole tools, allowing for wireless communication by encoding digital signals using strain measurements, eliminating the need for pressure transducers and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure transducers are used for downhole telemetry, then reliable communication is achieved, but cost and power consumption increase significantly
Solution Approach 1:
The patent replaces pressure transducers (electrical/mechanical sensing system) with a purely mechanical strain-based communication system. The tool body itself acts as the sensor, using its natural elastic deformation under pressure to encode communication signals, eliminating the need for separate electrical sensing components and their associated power requirements.
Solution Approach 2:
The downhole tool body serves dual purposes: it performs its primary function (e.g., fracturing, pumping) while simultaneously serving as the communication sensor. The tool's own structural deformation under fluid pressure is harvested for signal encoding, making the system self-sufficient without requiring additional power-hungry sensing components.
2Reliability
If pressure transducers are used for downhole telemetry, then communication functionality is achieved, but cost increases significantly
Solution Approach 1:
The patent replaces expensive pressure transducers with inexpensive strain gauges that can be easily manufactured and installed. The strain gauges are simple resistive elements that can be applied directly to the tool body surface, dramatically reducing component cost while maintaining communication functionality.
Solution Approach 2:
The patent eliminates the need for complex pressure transducer assemblies by using the tool body's inherent mechanical properties for signal detection. This substitution of a simple mechanical strain measurement system for a complex electronic pressure sensing system dramatically reduces both component and manufacturing costs.
3Ease of operation
If pressure transducers are used for downhole telemetry, then wireless communication is achieved, but the system requires holes in tubulars which complicates installation
Solution Approach 1:
The patent replaces the pressure transducer system that requires fluid pressure pathways (and thus holes in tubulars) with a direct mechanical strain measurement system. The strain gauges are mounted on the external surface of the tool body, eliminating the need for internal pressure communication pathways and associated drilling or machining operations.
Solution Approach 2:
The tool body serves multiple functions simultaneously: it performs its primary downhole operation while also serving as the structural element that converts pressure into measurable strain. This multi-functionality eliminates the need for separate pressure sensing pathways and simplifies the overall system design and installation.
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 provides reliable, cost-effective wireless communication with downhole tools, enabling precise control of operations like hydraulic fracturing without the need for expensive or power-hungry components, while maintaining operational efficiency in low-margin well operations.
Implementation Method 1
A strain sensor mounted on the downhole tool is used to measure the mechanical deformations
Implementation Method 2
applying fluid pressure differentials to a downhole tubular in a predefined pattern, the predefined pattern representing a digital signal, the fluid pressure differentials causing mechanical deformations on the downhole tubular
Data Source
AI summary
Systems and methods for wireless telemetry in oil and gas wells use fluid pressure differentials to send signals from surface equipment to a downhole tool. More specifically, the methods and systems selectively apply fluid pressure to a tubing string and measure the resulting mechanical strain, or deformation, on a tubular of the downhole tool. The deformation may be an elastic deformation or it may be a plastic deformation with yielding of the tubular. One or more of such strains or deformations may be used to encode a digital signal that can command an action on the tool. The strain or deformation may be measured by a low-cost strain gauge.