Downhole Sensor Contact Pressure via Hydraulic Force
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Solution Overview
Problem
Existing downhole sensor systems face challenges in accurately measuring drilling parameters due to movement and misalignment, leading to inaccurate data collection and reduced longevity of drill string components during drilling operations.
Innovation Solution
A downhole sensor apparatus is designed with a larger exterior surface area and a smaller interior interface, utilizing downhole drilling fluid pressure to secure the sensor within the drill string component, increasing contact pressure and static friction, which stabilizes the sensor and enhances measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the sensor is installed in a recess of the drill string component, then the sensor is protected and integrated into the drill string, but the sensor may move or misalign leading to inaccurate measurements
Solution Approach 1:
The sensor apparatus is pre-configured with an exterior surface area larger than the interface area, so that when drilling fluid pressure is applied, the force is automatically directed to create high contact pressure at the interface between the sensor structure and the recess, securing the sensor in place before measurements begin
Solution Approach 2:
The invention utilizes downhole drilling fluid pressure (hydraulic force) to secure the sensor apparatus within the recess. The external pressure applied to the larger exterior surface area creates a force that transfers through the sensor structure to the interface, increasing contact pressure and static friction to prevent sensor movement
2Reliability
If the external pressure is applied to secure the sensor, then the sensor is stabilized, but the contact area is smaller than the exterior surface area requiring higher contact pressure
Solution Approach 1:
The invention changes the geometric parameters of the sensor apparatus by designing the exterior surface area to be larger than the interface area. This parameter change allows the same external force to generate higher contact pressure at the interface, improving sensor security without requiring additional force
Data Source
AI summary
A downhole sensor apparatus may include a first surface at a first end of the downhole sensor apparatus, a sensor coupled to the downhole sensor apparatus, and an exterior surface at a second, opposite end of the downhole sensor apparatus. The downhole sensor apparatus is configured to be inserted into a recess of a drill string component such that the first surface is adjacent an interior surface within the recess. The exterior surface of the downhole sensor apparatus is configured to receive external pressure that results in a force that transfers through the downhole sensor apparatus to an interface defined by a contact area between the first surface and the interior surface. The contact area of the interface is smaller than the exterior surface. Drill string components, such as earth-boring and downhole tools, incorporating such a downhole sensor apparatus and methods of using same are also disclosed.