Wellhead Valve Assembly with Visual Seating Indicators
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Solution Overview
Problem
Conventional wellhead assemblies face challenges in safely and effectively containing wellbore pressures and flows, especially during periods when the Christmas tree is removed and before a blowout preventer assembly is installed, due to difficulties in installing backpressure valves and test plugs, and compromised hanger threads leading to potential blowouts and safety risks.
Innovation Solution
A wellhead valve assembly comprising a seal bushing assembly, hanger valve assembly, and wellhead adapter with elastomeric sealing members and a valve actuator, allowing for selective control of wellbore flow and pressure containment, and capable of suspending tubular strings, providing an additional safety barrier and preventing undesired releases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backpressure valves and test plugs are installed in conventional hanger through bores, then additional pressure isolation barriers are provided, but installation is difficult and proper seating cannot be confirmed
Solution Approach 1:
A visual indicator system acts as an intermediary between the installer and the valve/plug seating status. The indicator provides real-time visual feedback during installation, allowing the installer to confirm proper seating without difficulty. This mediator bridges the gap between the physical installation process and the verification of correct installation.
2Ease of manufacture
If hanger threads are exposed to wellbore production and intervention activities, then temporary anchoring of backpressure valves is enabled, but threads become damaged and compromised over time
Solution Approach 1:
The anchoring function is extracted from the hanger threads and relocated to a dedicated anchoring mechanism within the wellhead valve assembly. This separates the temporary anchoring requirement from the compromised thread structure, allowing valves to be securely anchored without relying on deteriorating threads.
3Ease of operation
If Christmas tree is removed from wellhead, then access to hanger through bore for valve installation is improved, but wellbore pressure containment is compromised
Solution Approach 1:
The wellhead valve assembly is pre-configured with integrated pressure containment capabilities and anchoring mechanisms before the Christmas tree is removed. This preliminary preparation ensures that pressure containment is maintained throughout the installation process, eliminating the vulnerability period when the tree is off but containment is not yet re-established.
4Device complexity
If conventional wellhead assemblies use through-bore design for hanger support, then structural simplicity is maintained, but visual indication and control of valve placement are lost
Solution Approach 1:
Visual indicators utilizing color changes or distinct visual markings are incorporated into the wellhead valve assembly. These indicators provide clear, easily detectable signals about valve placement and seating status, transforming the invisible internal state into visible information without complicating the through-bore design.
Data Source
AI summary
A valve assembly is installed within a wellhead such as a conventional tubing hanger or casing hanger used to suspend pipe or other tubular goods in a well. A seal bushing assembly is installed in a tubing head assembly or other wellhead component. A hanger valve assembly is stung into the seal bushing assembly and includes a valve that can be selectively opened or closed. In the open position, the valve does not restrict a central flow path diameter through the hanger and wellhead. In the closed position, the valve contains pressure and/or fluid flow and fully seals against wellbore pressure acting on the valve. A wellhead adapter covers the hanger valve assembly and provides an attachment point for a conventional Christmas tree or other wellhead equipment.