Kickoff-Point Casing Rotation for Two-Stage Cementing Integrity
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Solution Overview
Problem
Conventional cementing operations in wellbore drilling often face challenges in rotating the entire casing string due to its length and weight, leading to two-stage cementing to prevent formation breakdown, which complicates the process and requires additional interventions.
Innovation Solution
A rotating tool system positioned above the kickoff point or build section of a well, featuring an inner and outer housing with a clutch mechanism that allows the inner housing to rotate independently and transfer forces to the outer housing, enabling the casing string to be rotated effectively during cementing, with a sub and burst disc system for controlled cement displacement and zonal isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire casing string is rotated during cementing operation, then cement slurry displacement efficiency is improved, but the operation becomes impossible due to the length and weight of the casing string
Solution Approach 1:
The system divides the rotation function into two segments: a rotating tool positioned above the kickoff point that can be rotated, and a stationary lower casing string that remains fixed. The rotating tool includes an inner housing and outer housing with a clutch mechanism, allowing rotation of the upper portion while the lower portion stays stationary, thus solving the problem of rotating the entire heavy casing string.
Solution Approach 2:
The rotating tool acts as an intermediary device between the surface rotation capability and the downhole cementing operation. It includes a clutch mechanism positioned between the inner and outer housing that transfers rotation forces selectively, enabling the upper casing to rotate while isolating the lower heavy casing string from rotational forces.
2Reliability
If a two-stage cementing operation is performed to prevent formation breakdown, then formation integrity is protected, but the process complexity and intervention requirements increase
Solution Approach 1:
The system enables dynamic control of the cementing operation by allowing rotation of the casing string during the second stage cementing. The clutch mechanism can engage or disengage based on operational requirements, providing flexibility to optimize cement displacement while maintaining formation integrity, thereby reducing the need for additional intervention stages.
Solution Approach 2:
The rotating tool changes the operational parameters of the cementing process by introducing controlled rotation during cement slurry displacement. This parameter change improves cement placement efficiency and uniformity, allowing a single-stage operation to achieve results that previously required two-stage cementing, thus reducing process complexity.
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 efficient first and second stage cementing operations, ensuring annular cement well barrier integrity and reducing intervention complexity by uniformly displacing cement into the annulus, thereby enhancing zonal isolation and wellbore integrity.
Implementation Method 1
the clutch transfer rotation forces to the casing string below the rotating tool, via the outer housing
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.