Downhole Logging Tool Orientation Control in Deviated Wellbores
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Solution Overview
Problem
Downhole logging tools experience uncontrollable orientation changes due to factors like borehole rugosity, tortuosity, scale, and deviation, leading to inconsistent data interpretation and increased risks of stuck pipe.
Innovation Solution
A downhole orientation tool with orientation sensors, a motor, and a tractor system that actively controls the tool's axial orientation using gyroscopes and retractable arms to maintain consistent logging tool orientation, coupled with a caliper sub-assembly for measuring wellbore dimensions and a centralizer for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If downhole logging tools are run in the wellbore without active orientation control, then the tool can be moved through the wellbore easily, but the tool orientation changes uncontrollably due to borehole rugosity, tortuosity, scale, and deviation
Solution Approach 1:
The patent implements an active orientation control system that dynamically adjusts tool orientation during logging operations. The system includes orientation sensors (gyroscopes, accelerometers) that continuously monitor tool orientation, and a control system that activates orientation motors to correct deviations from the desired orientation. This dynamic control mechanism allows the tool to maintain stable orientation despite borehole irregularities, while still permitting easy movement through the wellbore when needed.
Solution Approach 2:
The patent employs a feedback-based orientation control system where orientation sensors continuously measure the tool's actual orientation, and this information is fed back to a control system. The control system compares the measured orientation with the desired orientation and activates orientation motors to correct any deviations. This closed-loop feedback mechanism ensures consistent tool orientation throughout the logging process, resolving the contradiction between ease of movement and orientation stability.
2Stability of the object's composition
If active orientation control is implemented using sensors and motors, then tool orientation consistency is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single unified orientation control system. The control system performs orientation measurement, data processing, and motor control functions simultaneously. The orientation sensors serve both navigation and stabilization purposes. This multi-functional approach reduces the need for separate dedicated components for each function, thereby managing device complexity while achieving consistent tool orientation.
Solution Approach 2:
The patent combines the orientation sensing, processing, and actuation functions into an integrated control system. The orientation sensors, control electronics, and orientation motors are merged into a cohesive system that manages tool orientation. This integration reduces the number of separate components and interfaces, simplifying the overall device architecture while maintaining orientation consistency.
3Quantity of substance
If multiple logging runs are performed without orientation control, then more data can be collected, but data interpretation becomes inconsistent and unreliable
Solution Approach 1:
The patent establishes a reference orientation framework before conducting multiple logging runs. The system determines a reference orientation for the wellbore and uses this as a baseline for all subsequent measurements. By pre-establishing this reference frame, the system ensures that data from multiple runs can be consistently interpreted and compared, maintaining measurement precision across all operations.
Solution Approach 2:
The patent uses feedback-based orientation control to maintain consistent tool orientation across multiple logging runs. The orientation sensors continuously monitor and the control system actively maintains the desired orientation throughout each run. This ensures that data collected during multiple runs are all acquired from the same consistent orientation perspective, enabling reliable and consistent data interpretation across all runs.
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
Ensures consistent data interpretation across multiple logging runs, minimizes stuck pipe risks, and optimizes wireline logging trips by maintaining precise tool orientation and radial coverage.
Implementation Method 1
the one or more orientation sensors includes one or more gyroscopes configured detect the rotational motion of the tool during running in the wellbore
Data Source
AI summary
A downhole orientation tool includes a top sub-assembly configured to couple to a downhole conveyance and run into a wellbore on the downhole conveyance from a terranean surface to one or more subterranean formations; one or more orientation sensors coupled to the top sub-assembly and configured to detect rotational motion of the tool during running in the wellbore; an orientation motor coupled to the one or more orientation sensors and configured to axially rotate the tool in the wellbore in response to the detected rotational motion of the tool during running in the wellbore to orient the tool at a particular axial orientation during running in the wellbore; and a tractor coupled to the top sub-assembly, the one or more orientation sensors, and the orientation motor and configured to provide motive force to move the tool through the wellbore.