Rotatable Casing Hanger Assembly for Uniform Well Cementing
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Solution Overview
Problem
The effectiveness of a casing string in supporting a wellbore and providing fluid isolation is compromised by voids in the cement layer surrounding it, leading to reduced structural support and fluid isolation capabilities.
Innovation Solution
A rotatable casing hanger and running tool system that allows for the rotation of the casing string during cementing, utilizing a hanger body, hanger sleeve, and bearing assembly to transfer axial force and maintain centralization, along with a tool body and tool sleeve to facilitate rotation and centralization, ensuring uniform cement distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the casing string is cemented in a fixed position without rotation, then the cementing process is simple and quick, but the cement distribution becomes non-uniform with voids forming around the casing string
Solution Approach 1:
The casing hanger is designed with a bearing assembly that enables rotational movement during the cementing process. The running tool includes a tool bearing assembly that facilitates rotation of the tool body, and the hanger bearing assembly that facilitates rotation of the hanger body. This dynamic capability allows the casing string to rotate during cementing, ensuring uniform cement distribution around the casing while maintaining structural support and fluid isolation effectiveness.
2Reliability
If a rotatable casing hanger with bearing assemblies is used to enable rotation during cementing, then cement distribution uniformity improves, but the device complexity and potential points of failure increase
Solution Approach 1:
The bearing assemblies serve as intermediary components that enable rotation between the running tool and the casing hanger. The tool bearing assembly is disposed between the tool body and tool sleeve, while the hanger bearing assembly is disposed between the hanger body and hanger sleeve. These intermediary bearing components facilitate controlled rotation during cementing, ensuring uniform cement distribution while maintaining structural integrity and reducing voids in the cement layer.
3Manufacturing precision
If rotation during cementing is implemented, then cement distribution and casing effectiveness improve, but the risk of damage to surrounding components increases
Solution Approach 1:
The bearing assemblies are specifically designed to control rotational parameters during cementing. The tool bearing assembly and hanger bearing assembly enable rotation while maintaining proper clearance and alignment, preventing excessive movement that could damage surrounding components. The bearing design allows for controlled rotation at appropriate speeds and ranges, ensuring uniform cement distribution without causing harm to the wellbore or surrounding structures.
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
Enhances cement distribution uniformity and improves the structural support and fluid isolation capabilities of the casing string by allowing rotation during cementing, reducing the likelihood of damage to surrounding components and extending the lifespan of the bearing assembly.
Implementation Method 1
a hanger bearing assembly disposed axially between the hanger body and the hanger sleeve to facilitate rotating the hanger body relative to the hanger sleeve as well as transferring axial force between the hanger body and the hanger sleeve
Implementation Method 2
a tool bearing assembly disposed between the tool body and the tool sleeve to facilitate rotating the tool body and, thus, the hanger body of the rotatable casing hanger and the casing string relative to the tool sleeve
Data Source
AI summary
Techniques for implementing and/or operating a well system including a rotatable casing hanger and a rotatable running tool. The rotatable casing hanger includes a hanger body, which is to be secured to a casing string; a hanger sleeve secured circumferentially around the hanger body, in which the hanger sleeve is to be landed on another wellhead component; and a hanger bearing assembly disposed axially between the hanger body and the hanger sleeve. The rotatable running tool includes a tool body that defines a tool bore, in which the tool body is to be selectively secured to the hanger body; a tool sleeve secured circumferentially around the tool body to facilitate maintaining centralization of the tool body and, thus, the rotatable casing hanger; and a tool bearing assembly disposed between the tool body and the tool sleeve.