Wellbore Radial Positioning Apparatus for Angular Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing downhole logging tools face challenges in accurately controlling and changing their angular position within irregularly shaped boreholes, leading to unsuccessful rock formation tests due to lack of radial position control, resulting in inaccurate tool positioning and failed surveys or sample acquisition.
Innovation Solution
A wellbore radial positioning apparatus comprising a tool body, motor, traction tool with a sprocket or friction wheel, and positioning sensors that allow the tool body to rotate and adjust its radial position within the wellbore by frictionally attaching to the borehole wall, using a decentralizing spring or pad to maintain contact and ensure precise angular positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional logging tools are deployed in irregular boreholes, then the tools can be deployed to desired depths, but the tools cannot accurately control or change their angular position, resulting in inaccurate positioning
Solution Approach 1:
The patent applies dynamics by making the tool body rotatable relative to the traction tool. The motor enables dynamic angular positioning of the tool body, allowing it to rotate to desired orientations while the traction tool remains engaged with the borehole wall. This dynamic capability resolves the contradiction by enabling precise angular control without requiring the entire logging assembly to be complex.
Solution Approach 2:
The patent segments the positioning function into two independent parts: the traction tool that provides radial positioning and engagement with the borehole, and the tool body that can rotate independently for angular positioning. This segmentation allows each component to be optimized separately, reducing overall device complexity while achieving both radial and angular control precision.
2Reliability
If the logging tool is deployed without radial position control, then the deployment is simpler, but the tool position becomes inaccurate leading to failed surveys
Solution Approach 1:
The patent applies preliminary action by using the decentralizing tool to pre-position the traction tool against the borehole wall before the main logging operation begins. This preliminary radial positioning ensures the tool is correctly positioned before angular adjustments are made, improving survey reliability without requiring complex active control during the actual logging process.
Solution Approach 2:
The traction tool design allows it to self-adjust and maintain contact with the borehole wall through its engagement mechanism. The tool body can rotate while the traction tool maintains its radial position automatically, reducing the need for complex active control systems and improving reliability through passive self-positioning capabilities.
3Adaptability or versatility
If the tool body rotates relative to the traction tool, then angular position can be changed, but maintaining firm contact with the borehole wall becomes difficult
Solution Approach 1:
The patent segments the system into a stationary traction tool that maintains firm contact with the borehole wall and a rotatable tool body that performs angular positioning. This segmentation allows the traction tool to provide stable radial engagement while the tool body independently rotates, resolving the contradiction between adaptability for angular adjustment and stability for maintaining contact.
Solution Approach 2:
The motor acts as an intermediary between the traction tool and the tool body, enabling controlled rotation of the tool body while the traction tool remains engaged with the borehole. This intermediary mechanism allows angular position changes without compromising the firm contact provided by the traction tool, as the motor transmits only the necessary rotational motion.
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
Enables precise radial and angular positioning of downhole tools within wellbores, facilitating successful surveys and sample acquisition by maintaining firm contact with the borehole wall and utilizing sensors for feedback-controlled rotation, thereby improving the accuracy of rock formation testing.
Implementation Method 1
The decentralizing spring is configured to expand to cause the traction tool to be in a firm contact with the wellbore
Implementation Method 2
The traction tool comprises a sprocket wheel or a friction wheel and is configured to frictionally attach to the wellbore
Data Source
Figure 1
Figure 2A~2B
Figure 2C~3
AI summary
A wellbore radial positioning apparatus includes a tool body and a motor that actuates a traction wheel. The tool body is configured to be positioned within a wellbore. The motor driving the traction wheel is connected to the tool body and is configured to rotate the tool body in the wellbore. The traction tool is configured to frictionally contact or attach to the wellbore. The tool body is rotated in the wellbore by the action of the motor actuating the traction wheel.