Casing Rotating Tool With Clutch for Single-Stage Well Cementing
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Solution Overview
Problem
Conventional cementing operations in deviated wells face challenges in rotating the entire casing due to length and weight restrictions, necessitating two-stage cement jobs to prevent formation breakdown, which increases complexity and cost.
Innovation Solution
A rotating tool positioned above the kickoff point in the wellbore allows for the rotation of the casing string during cementing, using an inner and outer housing with a clutch mechanism to transfer rotational forces, enabling one-stage cement jobs with improved zonal isolation and annular cement integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire casing is rotated during cementing operation, then cement displacement efficiency is improved, but the operation becomes impossible due to length and weight restrictions of the casing string
Solution Approach 1:
The casing string is segmented into two functional parts: a rotating section (with outer housing and clutch mechanism) that can rotate to displace cement, and a stationary section (inner housing) that remains fixed. This segmentation allows the rotating portion to achieve cement displacement while the overall casing string remains too long and heavy to rotate completely.
Solution Approach 2:
The system transitions from a static casing string to a dynamic configuration where the outer housing can rotate relative to the inner housing through the clutch mechanism. This dynamic capability enables cement displacement in deviated wells without requiring rotation of the entire casing string.
2Reliability
If a two-stage cement job is performed to prevent formation breakdown, then formation integrity is protected, but the process complexity and cost increase
Solution Approach 1:
The rotating tool with clutch mechanism is installed beforehand in the casing string, enabling effective cement displacement in a single stage. This preliminary preparation eliminates the need for subsequent second-stage cementing operations, reducing overall process complexity while maintaining formation integrity.
Solution Approach 2:
The system changes the operational parameters of cementing by enabling rotation during cement displacement, which improves cement placement efficiency and allows single-stage cementing to achieve the same reliability as two-stage processes.
3Productivity
If the casing string is made longer to reach horizontal sections, then well productivity is improved, but the ability to rotate the casing during cementing deteriorates
Solution Approach 1:
The casing string is divided into rotating and non-rotating sections, allowing the overall string to be long enough for horizontal wells while only a manageable portion needs to rotate during cementing operations.
Solution Approach 2:
The clutch mechanism acts as an intermediary between the rotating outer housing and the stationary inner housing, transferring rotational motion only where needed while allowing the rest of the long casing string to remain stationary.
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
This approach facilitates efficient cement displacement and zonal isolation, reducing intervention complexity and ensuring robust wellbore integrity with a single-stage cement job, thereby enhancing productivity and reducing costs.
Implementation Method 1
a clutch positioned between the inner and outer housing... the clutch transfer rotation forces to the casing string below the rotating tool
Data Source
AI summary
Rotating a casing during a cementing operation to ensure efficient displacement of cement slurry. More specifically, embodiments are directed towards a sub and rotating tool that are positioned above a first cement operation, wherein the rotating tool is positioned in a kickoff point or build section of a horizontal well.