Downhole Pressure Sensor Array Housing for Shock-Resistant Sensing
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Solution Overview
Problem
Conventional sensor arrays for measuring pressure and temperature in downhole environments face challenges such as fragility of optical fibers, failure under bending, shock, and vibration, as well as difficulties in routing electrical conductors through robust housings that withstand extreme pressures and temperatures, and the need for robust bonding methods that avoid damaging heat exposure.
Innovation Solution
A downhole distributed pressure sensor array with sensor housings, cable segments, and electrical conductors that use quartz resonator pressure sensors and incompressible fluids, along with diaphragms and bulkheads to isolate components, and employ welding processes like electron-beam welding to create robust connections without exposing sensitive components to excessive heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical fibers are used as temperature and pressure sensors in downhole environments, then continuous temperature and pressure profiles can be obtained, but the fibers are fragile and prone to failure under shock and vibration
Solution Approach 1:
The patent replaces fragile optical fiber sensors with robust electrical pressure sensors that have solid construction capable of withstanding downhole shock and vibration conditions. The electrical sensors eliminate the mechanical fragility inherent in optical fibers while maintaining the ability to measure pressure and temperature continuously along the wellbore.
Solution Approach 2:
The patent employs composite housing structures that combine multiple materials with different properties to create sensor assemblies that are both robust against shock and vibration and capable of withstanding extreme pressures and temperatures. The composite construction allows the housing to provide mechanical protection while transmitting pressure to the sensors.
2Strength
If robust bonding methods like welding are used to connect sensor array components, then strong connections are achieved, but sensitive components are exposed to excessive heat
Solution Approach 1:
The patent divides the sensor assembly into separate functional zones: a welding zone for connecting structural components and a protected zone for housing sensitive electronic components. By segmenting the assembly, the welding process can be applied to outer housings and mounting structures without exposing the sensitive sensors and electronics to excessive heat, as they are positioned in thermally isolated compartments.
Solution Approach 2:
The patent introduces thermal barriers and heat-sinking structures as intermediary elements between the welding zones and sensitive components. These intermediaries absorb or redirect heat away from temperature-sensitive parts during the welding process, allowing strong mechanical connections to be formed without damaging the sensors or electronics.
3Reliability
If electrical conductors are routed through robust housings designed to withstand extreme pressures, then reliable electrical connections are achieved, but the housing design becomes more complex
Solution Approach 1:
The patent designs the sensor housing to serve multiple functions simultaneously: it provides mechanical strength to withstand downhole pressures, contains and protects electrical conductors and components, and facilitates assembly through integrated features. The housing acts as both a pressure vessel and an electrical conduit system, eliminating the need for separate protective structures and reducing overall design complexity.
Solution Approach 2:
The patent employs a nested housing structure where inner housings containing sensitive components are positioned within outer housings that provide structural strength. Electrical conductors are routed through channels in the outer housing and connect to components in the inner housing, creating a compact nested arrangement that protects conductors while maintaining structural integrity and simplifying the overall design.
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 solution provides a robust and reliable sensor array capable of withstanding extreme downhole conditions, ensuring accurate data transmission and reducing the risk of component damage, while allowing for efficient routing of conductors through the sensor housings.
Implementation Method 1
at least one quartz resonator pressure sensor disposed in a pressure housing for detecting a pressure of an environment external to the sensor housing
Implementation Method 2
quartz resonator pressure sensor
Implementation Method 3
at least one chamber in the sensor housing holding a substantially incompressible fluid and in communication with the at least one pressure sensor, the at least one chamber in communication with a sidewall of the sensor housing
Implementation Method 4
at least one diaphragm coupled to the sensor housing in communication with the at least one chamber and positioned at and defining a portion of the sidewall of the sensor housing
Implementation Method 5
employ welding processes like electron-beam welding to create robust connections without exposing sensitive components to excessive heat
Data Source
AI summary
Downhole distributed pressure sensor arrays include sensor housings each comprising at least one pressure sensor in a pressure housing. Downhole pressure sensors include a housing, at least one pressure sensor in a pressure housing portion of the housing, and at least one isolation element positioned at an outer wall of the housing.