Protective Wellhead Sleeve for Lockdown Screw Isolation
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Solution Overview
Problem
Lockdown screws in wellhead assemblies are often compromised during stimulation due to exposure to pressure and erosion, leading to increased costs, equipment damage, and unscheduled downtime.
Innovation Solution
A protective sleeve with a concave curvature is designed to fit within the recess of a wellhead assembly, isolating the lockdown screw from environmental factors using a resistance element and sealing members, ensuring it remains protected during subterranean operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If lockdown screws are exposed to stimulation pressure and erosion during wellbore operations, then the wellhead assembly can be stimulated and operated, but the lockdown screws become compromised leading to equipment damage and downtime
Solution Approach 1:
A protective sleeve is introduced as an intermediary component between the lockdown screw and the harmful stimulation environment. The sleeve fits over the lockdown screw within the spool recess, creating a barrier that prevents direct exposure to high-pressure fluids and debris while allowing the wellbore stimulation to proceed normally.
Solution Approach 2:
The protective sleeve is installed on the lockdown screw before the wellbore stimulation begins. This preliminary protective measure ensures that the lockdown screw is already shielded when exposed to high-pressure conditions, preventing compromise before it occurs.
2Reliability
If the protective sleeve is designed to fully isolate the lockdown screw from the environment, then the lockdown screw protection is improved, but the device complexity increases
Solution Approach 1:
The protective system is segmented into distinct functional components: the protective sleeve that provides isolation, the resistance element that secures the sleeve in position, and the sealing members that enhance the barrier function. This segmentation allows each component to perform its specific function efficiently while maintaining overall system manageability.
Solution Approach 2:
The protective sleeve is nested within the existing spool recess structure, utilizing the available space rather than adding external components. The resistance element and sealing members are integrated within the sleeve assembly, creating a compact nested structure that minimizes additional complexity while providing comprehensive protection.
Data Source
AI summary
A sleeve for protecting a lockdown screw of a wellhead assembly can include a body having an inner surface and an outer surface, wherein the body has a concave curvature, where the body is configured to be disposed within an upper portion of a recess of a component of the wellhead assembly inside of which the lockdown screw is disposed, where the concave curvature of the body is configured to match that of an inner wall of the component, and where the outer surface is configured to isolate the lockdown screw from an environment in a cavity partially formed by the inner surface when the body is disposed in the upper portion of the recess.