Distributed Torque, Drag, and Friction Modeling Along Wellbore Strings
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Solution Overview
Problem
During drilling operations, strings used in wellbores experience side forces and friction that can cause severe damage and wear, potentially leading to stuck strings, and existing methods lack effective means to accurately determine frictional forces between the string and the wellbore.
Innovation Solution
A method and apparatus that utilize a string disposed in the wellbore, employing a first processor to determine friction parameters between selected subregions of the string and the wellbore through friction tests, enabling the calculation of friction coefficients and distribution of friction forces along the string length, using sensors and a control unit to analyze displacement and force data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If friction tests are performed to determine friction parameters at multiple subregions, then measurement precision of frictional forces is improved, but device complexity and operational complexity increase
Solution Approach 1:
The string is divided into multiple subregions (first subregion, second subregion, etc.) along its length, with each subregion being tested independently to determine local friction parameters. This segmentation allows precise mapping of friction characteristics at different locations without requiring a completely complex testing system for the entire string at once.
Solution Approach 2:
Friction tests are performed at different times (first friction test time, second friction test time) to determine friction parameters at different subregions. By conducting tests preliminarily at various stages and locations, the system builds up a comprehensive friction profile without requiring all tests to be conducted simultaneously, reducing operational complexity.
2Reliability
If multiple friction tests are conducted at different times and locations, then reliability of friction determination is improved, but loss of time increases
Solution Approach 1:
The friction testing is segmented into multiple tests at different subregions and different times rather than one comprehensive test. This allows the system to achieve reliable friction determination by combining results from multiple localized tests, while the time loss is managed by performing tests at different stages of the drilling operation rather than requiring all tests to be completed simultaneously.
Solution Approach 2:
Friction testing is integrated into the continuous drilling operation, with tests performed at different times as the string is lowered and raised through the wellbore. This continuous integration ensures that friction parameters are determined reliably through multiple passes while minimizing time loss by utilizing the natural cycles of drilling operations rather than adding separate discrete testing phases.
3Productivity
If friction parameters are determined for the entire string, then productivity of drilling operation is improved, but measurement precision of local friction conditions deteriorates
Solution Approach 1:
The string is segmented into multiple subregions (first subregion, second subregion, etc.) along its length, with each subregion being tested independently to determine local friction parameters. This segmentation allows the system to achieve both productivity and measurement precision by providing localized friction data for each subregion while maintaining overall drilling efficiency through targeted testing rather than requiring complete string testing.
Solution Approach 2:
The system determines friction parameters specifically for each subregion rather than assuming uniform friction characteristics along the entire string. By focusing on local friction conditions at different locations (first subregion, second subregion), the system maintains measurement precision for local conditions while improving productivity by avoiding unnecessary testing of entire string sections that do not require detailed analysis.
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 determination of frictional forces, allowing for proactive identification and mitigation of potential sticking points, thereby reducing string damage and enhancing drilling efficiency by identifying and addressing friction-related issues in real-time.
Implementation Method 1
determine, by a first friction test at a first friction test time, a first friction parameter between the first subregion and the wellbore and a second friction parameter between the second subregion and the wellbore
Data Source
AI summary
A method and apparatus for performing an operation in a wellbore penetrating the earth's formation. The apparatus includes a string and a first processor. The string is disposed in the wellbore. The first processor a first processor determines, by using a first friction test at a first friction test time, a first friction parameter between a first selected subregion and the wellbore and a second friction parameter between a second selected subregion and the wellbore.