MPD Flow Spool Riser Segments for Rotary Passage
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Solution Overview
Problem
Existing MPD riser segment assemblies with larger diameters or transverse dimensions pose challenges for existing drilling rigs, as they cannot be easily retrofitted and require cumbersome manual handling due to size constraints, making it difficult to integrate new components into existing rotary systems.
Innovation Solution
Design of riser segment assemblies with a main tube, collar, and valve configuration that allows for the assembly of flow spool segments to be lowered through a rotary without welding, featuring a double ball valve and connector system that adjusts transverse dimensions to fit within standard rotary diameters, enabling secure fluid communication and assembly below the rotary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If MPD riser segment assemblies use larger diameter components to accommodate MPD equipment, then MPD functionality is achieved, but the components cannot fit through existing drilling rig rotaries
Solution Approach 1:
The flow spool assembly is divided into multiple separable sections that can be assembled in a compact configuration for passing through the rotary, then connected to form the complete MPD-capable assembly below the rotary. The collar and valve assembly can be detached from the main body to reduce transverse dimension during installation.
2Area of stationary object
If MPD components are assembled in a compact configuration to fit through the rotary, then installation through existing rigs is enabled, but assembly complexity increases
Solution Approach 1:
The flow spool sections are pre-assembled in a compact configuration at the fabrication site that fits within the rotary diameter. This preliminary compact assembly eliminates the need for complex field assembly operations, reducing on-site complexity while maintaining MPD functionality.
3Ease of operation
If MPD riser segments are designed with standard dimensions, then they can be installed through existing rotaries, but MPD equipment cannot be accommodated
Solution Approach 1:
The MPD equipment is nested within the flow spool assembly in a space-efficient arrangement that maintains the overall external dimensions within standard rotary limits. The collar, valve, and other MPD components are integrated in a nested configuration that accommodates all necessary equipment without increasing the transverse dimension beyond rotary capacity.
Data Source
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Figure 3A
AI summary
This disclosure includes flow spool riser segment assemblies (22, 22a) that are suitable for managed pressure drilling (MPD) and that can be lowered (e.g., when connected to other riser segment assemblies) through a rotary of a drilling rig. Some embodiments are configured to have portions of the flow spool connected (e.g., without welding) below the rotary.