Rotating Wellhead Hanger Assembly for Uniform Cement Distribution
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Solution Overview
Problem
Current wellhead hanger systems face challenges in efficiently rotating and suspending tubular strings during cementing operations, leading to uneven cement distribution and potential cavities or fissures, and require complex mechanisms for torque transmission and disconnection.
Innovation Solution
A wellhead hanger assembly comprising a wellhead hanger, an inner sleeve, and an outer sleeve that transmits torque through castellated engagement, with a running tool coupled via dogs for directional torque transmission, allowing synchronized rotation and easy disconnection of the inner sleeve, facilitating uniform cement distribution and string suspension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a complex torque transmission mechanism is used to rotate tubular strings during cementing, then rotation efficiency and cement distribution uniformity improve, but device complexity increases
Solution Approach 1:
The system is divided into distinct functional components: an outer sleeve with castellations for torque transmission, an inner sleeve for disconnection, and a running tool with dogs for directional torque transmission. Each segment performs a specific function, allowing the complex overall task of uniform cement distribution to be achieved through coordinated simple components rather than a single complex mechanism
Solution Approach 2:
The inner sleeve is nested within the outer sleeve, with the inner sleeve containing ribs that interact with slots in the outer sleeve. This nested arrangement allows the inner sleeve to be easily disconnected and removed through the outer sleeve while maintaining a compact structure that avoids the need for separate complex disconnection mechanisms
2Reliability
If a secure torque transmission engagement is used to drive hanger rotation, then rotation reliability improves, but ease of disconnection deteriorates
Solution Approach 1:
The system transitions from a static secure engagement to a dynamic disconnection process. The inner sleeve's ribs interact with slots in the outer sleeve, allowing the inner sleeve to be easily pulled out through the outer sleeve after rotation is complete. This dynamic design maintains secure torque transmission during rotation while enabling easy disconnection afterward
Solution Approach 2:
The slots in the outer sleeve act as an intermediary mechanism between the secure castellated engagement and the easy disconnection of the inner sleeve. The ribs of the inner sleeve pass through these slots during disconnection, allowing the inner sleeve to be removed without compromising the secure torque transmission that occurred during rotation
3Measurement precision
If directional torque transmission is implemented to control rotation direction, then rotation control precision improves, but device complexity increases
Solution Approach 1:
The dogs on the running tool are designed with asymmetric geometry that allows torque transmission in one direction but not the other. This asymmetric design provides precise rotational direction control without requiring complex control systems, as the mechanical geometry itself enforces the directional constraint
Data Source
AI summary
A wellhead hanger assembly is provided. In one embodiment, a system includes a wellhead hanger, an inner sleeve coupled to the wellhead hanger, a running tool coupled to the inner sleeve, and an outer sleeve coupled to the running tool. The outer sleeve may be positioned to transmit torque from the running tool to the wellhead hanger, and the wellhead hanger may be in castellated engagement with the outer sleeve via a set of castellations and mating slots. Additional systems, devices, and methods are also disclosed.