Kickoff-Point Casing Rotating Tool for Two-Stage Cementing
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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 the need for 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 and cemented efficiently in stages, with a burst disc and wiper plug system for pressure management and cement displacement.
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 infeasible due to the length and weight of the casing string
Solution Approach 1:
The rotating tool divides the casing string into two functional segments: an upper rotatable section and a lower stationary section. The upper part can be rotated to displace cement slurry efficiently, while the lower part remains fixed to provide structural support and overcome the limitations of rotating the entire string due to its length and weight.
Solution Approach 2:
The rotating tool acts as an intermediary device positioned at a specific depth in the wellbore. It receives rotational input from the surface and transfers it to the cement slurry in the annulus, enabling efficient displacement without requiring rotation of the entire heavy casing string.
2Reliability
If two-stage cementing is performed to prevent formation breakdown, then formation integrity is maintained, but the process complexity increases
Solution Approach 1:
The rotating tool enables dynamic control of the cementing process by allowing rotation during cement slurry displacement. This dynamic capability improves cement placement efficiency and uniformity, potentially reducing the need for complex multi-stage operations while maintaining formation integrity.
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 solution allows for a standard first-stage cement job followed by a second-stage cementing operation that ensures annular cement well barrier integrity, reducing intervention complexity and enhancing zonal isolation by uniformly displacing cement into the annulus, thus maintaining the integrity of the cement well barrier.
Implementation Method 1
the clutch transfer rotation forces to the casing string below the rotating tool, via the outer housing
Implementation Method 2
pressure may be configured to build within the housing to burst the burst disc. When the burst disc ruptures a burst disc port may be exposed
Implementation Method 3
Cement may then circulate or be displaced at 6-8 bbbls/min into the annulus while rotating the upper part of the string with 15-30 rpm to uniformly displace the cement into the annulus
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.