Vibration-Induced Wellbore Casing Installation
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Solution Overview
Problem
The installation of wellbore casing is hindered by high friction between the casing string and the wellbore, and ensuring even cement distribution and bonding is challenging, often leading to delays and costly re-drilling or re-reaming operations.
Innovation Solution
A vibration assembly is integrated into the casing shoe, powered by fluid flow, using a turbine and unbalanced shaft to reduce friction and enhance cement distribution, equipped with sensors and communication for real-time monitoring and wireless data transmission to a topside facility, with a rupture disc to manage fluid flow and vibration frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional methods are used to install casing, then the installation process is simple, but high friction between the casing string and wellbore causes installation delays and difficulties
Solution Approach 1:
The patent applies mechanical vibration by incorporating a vibration assembly with an unbalanced shaft that rotates to generate vibrational forces. These vibrations reduce the coefficient of friction between the casing string and wellbore, enabling smoother installation through high-friction zones without requiring excessive pulling forces or causing wellbore damage.
Solution Approach 2:
The vibration assembly acts as an intermediary device between the casing string and wellbore. It converts fluid flow energy into mechanical vibrations that mediate the interaction between the casing and wellbore walls, reducing direct frictional contact and enabling easier installation.
2Manufacturing precision
If conventional installation methods are used, then the process is straightforward, but even cement distribution and bonding are difficult to ensure
Solution Approach 1:
The vibration assembly generates mechanical vibrations during the cementing process that enhance cement distribution uniformity. These vibrations prevent cement stagnation, improve cement-rock bonding, and ensure even cement sheath formation around the casing shoe, achieving precise cement placement without complex additional equipment.
Solution Approach 2:
The vibration assembly is powered by the fluid flow itself, converting the kinetic energy of the circulating fluid into mechanical vibrations. This self-powered mechanism eliminates the need for external power sources or complex control systems, achieving effective cement distribution through the inherent energy of the drilling fluid.
3Reliability
If traditional monitoring methods are used, then the system is simple, but early detection of cement job quality is not enabled
Solution Approach 1:
The vibration assembly incorporates sensors that provide real-time feedback on vibration characteristics and cementing process parameters. This feedback enables early detection of cement job quality by monitoring changes in vibration patterns, allowing operators to adjust the cementing process dynamically and identify potential issues before they become critical.
Solution Approach 2:
The patent replaces traditional mechanical monitoring methods with sensor-based detection systems that measure vibration frequencies and other physical parameters. This substitution enables more precise and early detection of cement job quality by detecting subtle changes in the mechanical environment that would be imperceptible through conventional methods.
4Adaptability or versatility
If a rupture disc is added to manage fluid flow, then vibration frequency control is improved, but device complexity increases
Solution Approach 1:
The rupture disc introduces a dynamic element to the vibration assembly that adapts to varying fluid flow conditions. As fluid pressure changes during different stages of installation and cementing, the rupture disc opens or closes to regulate flow and control vibration frequency, allowing the system to automatically adjust to different operational requirements without external control.
Solution Approach 2:
The rupture disc controls vibration frequency by changing fluid flow parameters through pressure-driven opening and closing. By regulating the amount of fluid passing through the vibration assembly, it modulates the rotational speed of the unbalanced shaft and thus the vibration frequency, adapting to different operational conditions through simple pressure-based parameter changes.
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
The vibration assembly effectively reduces friction during casing installation, improves cement distribution and bonding, and enables early detection of cement job quality, enhancing operational safety and reducing completion time and costs.
Implementation Method 1
The unbalanced sub-assembly is configured to rotate and to impart a vibration to the casing in response to a fluid being passed through the casing
Implementation Method 2
The unbalanced sub-assembly includes a turbine and a shaft coupled to the turbine
Implementation Method 3
The rupture disc is configured to rupture above a specified differential pressure threshold caused by fluid flowing through the vibration assembly
Data Source
AI summary
An unbalanced sub-assembly is located within the wellbore casing shoe. The unbalanced sub-assembly includes a turbine and a shaft coupled to the turbine at a first end of the shaft. The unbalanced sub-assembly is configured to rotate and to impart a vibration to the casing in response to a fluid being passed through the casing. A rupture disc is positioned on one end of the unbalanced sub assembly. The rupture disc is configured to rupture above a specified differential pressure threshold caused by fluid flowing through the vibration assembly. The rupture disc is configured to allow the fluid to bypass the unbalanced sub assembly when the rupture disc is in a ruptured state. The rupture disc is configured to direct fluid through the unbalanced sub assembly when the rupture disc is in an un-ruptured state.